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19-2205; Rev 0; 10/01
KIT ATION EVALU BLE AVAILA
CDMA + GPS LNA/Mixers
General Description Features
o Low Average Current Consumption: 4.5mA (CDMA) o +2.7V to +3.6V Operation o 2.0dB Cascade GPS Noise Figure o 2.5 dB Cascade CDMA Noise Figure o Adjustable IIP3 o LO Output Buffer to Drive Tx Upconverter o 1A Shutdown Current o Tiny 2.1mm 2.7mm Chip-Scale Package (UCSPTM) o Single VCO for GPS and CDMA Operation o LO Divider Improves Phase Noise/Desensitization
MAX2385/MAX2386
The MAX2385/MAX2386 LNA/mixer ICs are designed for CDMA/cdma2000 1x and GPS applications. The MAX2385/MAX2386 are optimized for the Japanese 832MHz to 870MHz band, and can also be configured for the Korean/Chinese/U.S. 869MHz to 894MHz band. To optimize linearity and current consumption, the CDMA LNA comprises four gain states. The high-gain LNA has a reduced supply-current mode for use when no transmit (Tx) signal is present, and a high linearity mode, which minimizes Tx cross-modulation in the presence of a large interfering signal during talk mode. Two low-gain modes, provide higher cascade IIP3 at lower current. The lowest gain setting provides an LNA bypass and an ultra-low chip current of 4mA. This significantly extends the phone's standby time and lowers the overall current consumption of the phone. Gain-switching hysteresis can be adjusted by selection of an off-chip resistor, which sets the current and linearity in each mode to customize switchover points. In GPS mode, the MAX2386 LNA offers high gain and the MAX2385 features lower current consumption with lower gain. The CDMA paths of the MAX2385/MAX2386 are identical. The MAX2385/MAX2386 include an on-chip LO divider, which enables the use of one VCO module for both cellular and GPS modes. An on-chip LO buffer to drive the Tx upconverter further reduces system complexity.
Ordering Information
PART MAX2385EBP-T MAX2386EBP-T TEMP. RANGE -40C to +85C -40C to +85C BUMP-PACKAGE 5 4 UCSP* 5 4 UCSP*
*Requires a special solder temperature profile described in the Absolute Maximum Ratings section.
Applications
CDMA/cdma2000 1x Cellular Phones with GPS
Block Diagram
GPS PATH
MAX2385 MAX2386
Pin Configuration/Functional Diagram/Typical Operating Circuit appears at end of data sheet.
CDMA PATH /2 LO BUFFER OUTPUT
LO BUFFER ENABLE
UCSP is a trademark of Maxim Products, Inc.
VCO
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
CDMA + GPS LNA/Mixers MAX2385/MAX2386
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +4.3V Digital Input Voltage to GND ........................-0.3V to VCC + 0.3V RF Input Power ...............................................................+12dBm Digital Input Current .........................................................10mA Continuous Power Dissipation 5 4 UCSP (TA = +70C, derate 1.2mW/C above TA = +70C) .................................................................995mW Thermal Resistance from Junction to Ambient ..............+80C/W Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Bump Temperature (Soldering) (Note 1) Infrared (15s) ...............................................................+220C Vapor Phase (60s) .......................................................+215C
Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not recommended.
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7 to +3.6V, RBIAS = 47k, VIH = +2.0V, VIL = +0.6V, TA = -40C to +85C. Typical values are at +2.75V and TA = +25C, unless otherwise noted.) (Note 2) (Table 1)
PARAMETER SYMBOL ULG mode LG mode CDMA Active Supply Current ICC MG mode HGLL HGHL GPS Active Supply Current Shutdown Supply Current Digital Input Logic High Digital Input Logic Low Digital Input Current Additional Current for LO Buffer BUFFEN = high ICC ICC VIH VIL -25 5.2 MAX2385 MAX2386 SHDN mode 2.0 0.6 25 7.3 RBIAS = 47k RBIAS = 36k (Note 3) CONDITIONS MIN TYP 3.7 6.5 8.3 10.2 12.5 17.4 9.6 16.9 0.1 MAX 4.5 7.6 9.7 11.8 15.0 20.9 11.6 22.3 10 mA A V V A mA mA UNITS
2
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CDMA + GPS LNA/Mixers
AC ELECTRICAL CHARACTERISTICS
(MAX2385/MAX2386 EV kit, VCC = +2.75V, TA = -40C to +85C, fRF = 832MHz to 870MHz (CDMA), fRF = 1575.42MHz (GPS), fIF = 110MHz, fLO = (fRF - fIF) 2 (CDMA), fLO = 1465.42MHz (GPS), LO input power = -12dBm, 50 RF system impedance, IF matched to 50 load, RBIAS = 47k, VIH = +2.0V, VIL = +0.6V. Typical values are at fRF = 851MHz, TA = +25C (CDMA). (Note 3) (Table 1)
PARAMETER FREQUENCY RANGE IF Frequency Range RF Frequency Range LO Frequency Range LNA PERFORMANCE HGHL mode HGLL mode MG mode Gain LG/ULG mode GPS mode (MAX2385) GPS mode (MAX2386) TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 851MHz TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 1575MHz (Note 6) TA = +25C, fRF = 1575MHz (Note 6) HGHL mode HGLL mode Noise Figure TA = +25C MG mode LG/ULG mode GPS mode HGHL mode Noise Figure Change Over Temperature (TA = +25C to +85C) HGLL mode MG mode LG/ULG mode GPS mode 13.8 13.1 12.4 -0.6 -1.4 -6.2 -7.1 16.6 14.5 19.7 16.8 1.5 1.5 3.8 8.2 1.7 0.5 0.5 0.9 1.0 0.5 dB 1.8 1.8 4.7 9.5 1.9 dB 20.9 22.1 18.5 20.4 -5.3 -4.4 dB 14.0 0.7 15.4 2.0 15.0 16.5 (Note 4) CDMA mode (Note 5) GPS mode CDMA mode GPS mode 1260 1300 70 832 1575.42 1482 1465 1600 1600 200 870 MHz MHz MHz CONDITIONS MIN TYP MAX UNITS
MAX2385/MAX2386
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2385/MAX2386 EV kit, VCC = +2.75V, TA = -40C to +85C, fRF = 832MHz to 870MHz (CDMA), fRF = 1575.42MHz (GPS), fIF = 110MHz, fLO = (fRF - fIF) 2 (CDMA), fLO = 1465.42MHz (GPS), LO input power = -12dBm, 50 RF system impedance, IF matched to 50 load, RBIAS = 47k, VIH = +2.0V, VIL = +0.6V. Typical values are at fRF = 851MHz, TA = +25C (CDMA). (Note 3) (Table 1)
PARAMETER CONDITIONS HGHL mode, PIN = -25dBm/tone HGLL mode, PIN = -30dBm/tone MG mode, PIN = -20dBm/tone IIP3 (Note 7) LG/ULG mode, PIN = -20dBm/tone, RBIAS = 47k LG/ULG mode, PIN = -20dBm/tone, RBIAS = 36k GPS mode, PIN = -35dBm/tone Reverse Isolation (S12) MIXER PERFORMANCE HGHL/HGLL mode MG mode LG mode Gain ULG mode GPS mode (MAX2385) GPS mode (MAX2386) TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 851MHz (Note 6) TA = +25C, fRF = 1575MHz (Note 6) TA = +25C, fRF = 1575MHz (Note 6) HGHL mode HGLL mode Noise Figure TA = +25C MG mode LG/ULG mode GPS mode HGHL/HGLL mode CDMA PIN = -25dBm/tone MG mode LG mode ULG mode GPS PIN = -35dBm/tone MAX2385 MAX2386 0.3 -2.3 -5.4 -7.3 9.9 8.0 9.6 7.2 9.1 7.0 1.6 -1.4 10.3 9.9 12.3 11.6 9 8.5 8.4 12.5 7.5 3.7 0.7 -1.5 -2.8 -3.4 0 dBm 10.2 9.7 9.6 14.5 8.5 dB 13.8 15.3 12.4 14.5 4.0 6.2 11.0 12.8 dB 11.3 13.1 11.7 13.5 HGHL mode MAX2385 MAX2386 20 MIN 4.5 -0.2 9.2 4.2 7.7 TYP 7.4 3.5 14.1 7.3 10.4 -5.0 -6.6 dB dBm MAX UNITS
IIP3 (Note 7)
4
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CDMA + GPS LNA/Mixers
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2385/MAX2386 EV kit, VCC = +2.75V, TA = -40C to +85C, fRF = 832MHz to 870MHz (CDMA), fRF = 1575.42MHz (GPS), fIF = 110MHz, fLO = (fRF - fIF) 2 (CDMA), fLO = 1465.42MHz (GPS), LO input power = -12dBm, 50 RF system impedance, IF matched to 50 load, RBIAS = 47k, VIH = +2.0V, VIL = +0.6V. Typical values are at fRF = 851MHz, TA = +25C (CDMA). (Note 3) (Table 1)
PARAMETER LO SECTION LO Input Power LO Leakage at LNA Input LO Output Power LO Output Noise Power LO Buffer Reverse Isolation BUFFEN = high, 100 load 45MHz to 55MHz offset -10 -12 -10 -40 -7 -145 35 -143 -5 dBm dBm dBm dBc/Hz dB CONDITIONS MIN TYP MAX UNITS
MAX2385/MAX2386
Note 2: DC characteristics are production tested at TA = +85C. DC specifications over temperature are guaranteed by design and characterization. Note 3: Specifications are guaranteed by design and characterization. Note 4: Operation over this frequency range requires each port to be rematched for the desired operating range. Performance at various frequencies is indicated by the S-parameter data in the Typical Operating Characteristics. Note 5: Operation outside this range is possible, although not guaranteed by design and characterization. Note 6: Guaranteed by production test at fMAX (870MHz) and TMAX (+85C). For GPS mode, fMAX = 1575.42MHz. Note 7: Specifications are based on RBIAS = 47k. ICC for all LNAs and mixers is inversely proportional to RBIAS. IIP3 can be traded for ICC by selecting other values of RBIAS. Two-tone IIP3 is measured with each tone input at the specified level separated by 900kHz.
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Typical Operating Characteristics
(MAX2385/MAX2386 EV kit, VCC = +2.75V, fRF = 851MHz (CDMA), fRF = 1575MHz (GPS), fLO = 1482MHz (CDMA), fLO = 1465MHz (GPS), PLO = -10dBm, PMIXER = -25dBm (CDMA), PMIXER = -35dBm (GPS), PLNA(HGHL) = -25dBm, PLNA(HGLL) = -30dBm, PLNA(MG) = PLNA(LG) = -20dBm, PLNA(GPS) = -35dBm, RBIAS = 47k, and TA = +25C, unless otherwise noted.)
LNA NOISE FIGURE (HGHL) vs. FREQUENCY
MAX2385/6 toc01
LNA NOISE FIGURE (HGLL) vs. FREQUENCY
MAX2385/6 toc02
LNA NOISE FIGURE (MG) vs. FREQUENCY
4.5 4.0 TA = +85C NOISE FIGURE (dB)
MAX2385/6 toc03
2.0 1.8 1.6 NOISE FIGURE (dB) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 TA = -40C TA = +25C TA = +85C
2.0 1.8 1.6 NOISE FIGURE (dB) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 TA = -40C TA = +25C TA = +85C
5.0
3.5 3.0 2.5 2.0 1.5 1.0
TA = +25C
TA = -40C
831 835 839 843 847 851 855 859 863 867 871 FREQUENCY (MHz)
831 835 839 843 847 851 855 859 863 867 871 FREQUENCY (MHz)
831 835 839 843 847 851 855 859 863 867 871 FREQUENCY (MHz)
LNA NOISE FIGURE (LG/ULG) vs. FREQUENCY
MAX2385/6 toc04
LNA NOISE FIGURE (GPS) vs. TEMPERATURE
MAX2385/6 toc05
LNA GAIN vs. RBIAS
HGHL 15 HGLL 10 5 MG 0 -5 -10 LG/ULG
MAX2385/6 toc06
9.5 9.0 8.5 NOISE FIGURE (dB) 8.0 7.5 7.0 6.5 6.0 5.5 TA = -40C TA = +85C
3.0 2.5 NOISE FIGURE (dB) 2.0 1.5 GPS MAX2386 1.0 0.5 0
20
TA = +25C
GAIN (dB) 35 60 85
GPS MAX2385
-15 -20 -40 -15 10 30 32 34 36 38 40 42 44 46 48 50 52 54 56 RBIAS (k) TEMPERATURE (C)
831 835 839 843 847 851 855 859 863 867 871 FREQUENCY (MHz)
LNA IIP3 vs. RBIAS
MG 16 14 12 IIP3 (dBm) 10 8 6 4 2 0 30 32 34 36 38 40 42 44 46 48 50 52 54 56 RBIAS (k) 0 HGLL HGHL LG/ULG GAIN (dB) 9
MAX2385/6 toc07
MIXER GAIN vs. RBIAS
MAX2385/6 toc08
MIXER IIP3 vs. RBIAS
8 5 HGHL/HGLL MG
MAX2385/6 toc09
18
15 HGHL/HGLL MG
12
LG
IIP3 (dBm)
2 -1 -4 ULG -7 -10 LG
6 ULG 3
30 32 34 36 38 40 42 44 46 48 50 52 54 56 RBIAS (k)
30 32 34 36 38 40 42 44 46 48 50 52 54 56 RBIAS (k)
6
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Typical Operating Characteristics (continued)
(MAX2385/MAX2386 EV kit, VCC = +2.75V, fRF = 851MHz (CDMA), fRF = 1575MHz (GPS), fLO = 1482MHz (CDMA), fLO = 1465MHz (GPS), PLO = -10dBm, PMIXER = -25dBm (CDMA), PMIXER = -35dBm (GPS), PLNA(HGHL) = -25dBm, PLNA(HGLL) = -30dBm, PLNA(MG) = PLNA(LG) = -20dBm, PLNA(GPS) = -35dBm, RBIAS = 47k, and TA = +25C, unless otherwise noted.)
MIXER NOISE FIGURE vs. LO POWER
MAX2385/6 toc11 MAX2385/6 toc12
MIXER GAIN vs. LO POWER
GPS HGHL/HGLL MAX2386 GPS MAX2385
MAX2385/6 toc10
MIXER IIP3 vs. LO POWER
7 HGHL/HGLL 5 3 IIP3 (dBm) MG 13
15
11 NOISE FIGURE (dB) HGHL/HGLL/MG 9
ULG
12 GAIN (dB)
1 -1 -3 -5 ULG LG GPS MAX2385 -11 -9 GPS MAX2386
9
LG
MG ULG
LG 7 GPS MAX2386 5 GPS MAX2385 -9 -7 -5
6
3 -15 -13 -11 -9 -7 -5 PLO (dBm)
-7 -15 -13 -7 -5 PLO (dBm)
-15
-13
-11
PLO (dBm)
LNA GAIN vs. PIN
MAX2385/6 toc13
MIXER GAIN vs. PIN
GPS MAX2386 14 12 GPS MAX2385
MAX2385/6 toc14
20 GPS MAX2386 15 10 GAIN (dB) 5 0 MG -5 LG/ULG GPS MAX2385 HGLL HGHL
16
GAIN (dB)
10 8 6 4 2 ULG -35 -30 -25 -20 -15 -10 -5 0 LG MG HGHL/HGLL
-10 -35 -30 -25
0 -20 -15 -10 -5 0 PIN (dBm) PIN (dBm)
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Pin Configuration/Functional Diagram/Typical Operating Circuit
CDMA GPS GPS IF VCC A1 GLNAOUT CLNAOUT B1 GIF+ A2 A3 GMXIN A4 GIFA5 CMXIN G1 B2 MODE B3 CIFB4 GND B5 VCC
CDMA IF
GPS
GLNAIN C1
MAX2385 RBIAS MAX2386 C2 C3 G2
C4 CIF+ /2
LO_OUT C5
GND D1 CDMA
CLNAIN D2 VCC RBIAS
VCC D3
GND D4
LO_IN D5
LO OUTPUT
BUFFEN
VCO
Pin Description
PIN A1 B1 C1 D1 A2, A4 B2 C2 D2 A3 B3 NAME GLNAOUT CLNAOUT GLNAIN GND GIF+, GIFG1 RBIAS CLNAIN GMIXIN MODE FUNCTION GPS LNA Output Port. This port requires an external pullup inductor and series blocking capacitor, which are part of the matching network. CDMA LNA Output Port. This port requires an external pullup inductor and series blocking capacitor, which are part of the matching network. GPS RF Input Port. Requires a blocking capacitor. Ground GPS Differential Output Port. Requires pullup inductors and blocking capacitors, which are used as part of the matching network. Logic Input (Table 1) Bias Setting Pin. The DC voltage at this pin is a bandgap voltage (+1.2V). For nominal bias, connect 47k resistor to ground. The value of this resistor can be adjusted to alter the linearity of the LNAs and mixers in all modes. See Figures 2 and 3 for resistor switching application circuits. Cellular RF Input Port. Requires a blocking capacitor. GPS Mixer Input Port. Requires a series blocking capacitor. Logic Input (Table 1)
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CDMA + GPS LNA/Mixers
Pin Description (continued)
PIN C3 D3 B4, C4 D4 A5 B5 C5 NAME G2 VCC CIF-, CIF+ GND CMIXIN GND LO_OUT Logic Input (Table 1) +2.7 to +3.6V Supply Pin. Bypass with 100pF capacitor as close to the pin as possible. CDMA Differential Output Port. Requires pullup inductors and blocking capacitors, which are used as part of the matching network. Ground CDMA Mixer Input Port. Requires a series blocking capacitor. Ground LO Buffer Output Port. Internally matched to 100. Requires a series blocking capacitor. LO Input Port. Also LO buffer enable (BUFFEN). Apply logic signal through 10k resistor. Set LO_IN high to enable the LO_OUT port. Set low to disable the LO_OUT port. AC-couple the LO input and DCcouple the buffer enable signal (see Typical Operating Circuit). FUNCTION
MAX2385/MAX2386
D5
LO_IN
Detailed Description
The MAX2385/MAX2386 are ideal for CDMA + GPS applications. These devices contain two LNA/mixer pairs: one pair for CDMA operation and one pair for GPS operation. The MAX2385/MAX2386 feature seven modes of operation, including shutdown. Table 1 depicts each mode along with the corresponding LNA and mixer configuration. These devices are ideal for Japanese cdma2000 1x applications. The RF frequency range is from 832MHz to 870MHz, and the IF frequency range is from 70MHz to 200MHz. In GPS mode, the RF frequency is
1575.42MHz. These devices can also be used for the Korean/Chinese/U.S. 869MHz to 894MHz band.
CDMA LNA
The MAX2385/MAX2386 have four modes of CDMA LNA operation: high gain, high linearity (HGHL); high gain, low linearity (HGLL); midgain (MG); and low gain (LG). The logic inputs MODE, G1, and G2 allow selection between these modes (Table 1). Use HGHL mode when extra-high linearity is required for cross-modulation suppression. When cross-modulation is not a concern or the transmitter is off, use HGLL mode. In MG mode, the device is designed to meet CDMA linearity with interferers at -32dBm/tone. When
FUNCTION LNA MIXER LGHL -- -- --
G G
Table 1. Mode Selection Truth Table
MODES CONTROL PINS G1 High Gain, High Linearity (HGHL) High Gain, Low Linearity (HGLL) Midgain (MG) Low Gain (LG) Ultra-Low Gain (ULG) GPS Shutdown (SHDN) 0 1 1 1 1 0 0 G2 0 1 0 1 0 1 X MODE 1 0 1 1 0 1 0 HGHL
G
HGLL --
G
MG -- --
G
GPS -- -- -- -- --
G
HG
G
MG -- --
G
LG -- -- --
G
UL -- -- -- --
G
GPS -- -- -- -- --
G
-- -- -- -- -- --
G
-- -- -- -- --
-- -- -- -- --
-- -- -- --
-- -- -- --
-- -- --
-- --
-- --
--
--
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
receiving large signals, use LG mode to significantly reduce current consumption (see the RBIAS Switching section).
RF Inputs
The mixer inputs CMIX_IN and GMIX_IN are typically connected to the LNA output through an off-chip image-reject bandpass filter. The LNA inputs and outputs require external matching networks to 50.
CDMA Downconverter
The CDMA mixer has four modes of operation for optimal performance and current conservation. The logic inputs MODE, G1, and G2 allow selection between the different modes (Table 1). The mixer output appears at the differential CIF+ and CIF- pins. Each of these open-collector outputs requires an external pullup inductor to VCC for DC biasing. This port requires a matching network for coupling to an external IF filter. To further reduce board complexity, the CDMA and GPS mixer outputs can be combined, eliminating one of the IF filters (Figure 1).
Applications Information
RBIAS Switching
Figures 2 and 3 show more sophisticated methods of varying the bias currents in different modes of operation. By adding a shunt resistor to RBIAS, the user can increase or decrease the total bias resistance (and therefore the bias current) in different modes, keeping in mind that the voltage at the R BIAS pin is +1.2V. Figure 2 uses a shunt resistor to decrease the total bias resistance (when R SHUNT is tied low). This method uses an additional DSP I/O control line. To avoid adding an extra I/O line to the system, the user can use the existing logic lines (MODE, G1, and G2). Figure 3 utilizes the G1 control pin, a transistor, and an additional resistor to change the bias current in certain modes. Both figures are simple ways to accommodate a wide range of power schemes.
LO Output Buffer
The LO_IN pin controls the LO output buffer. This pin turns the open-collector LO output buffer on and off to conserve current consumption as needed (see Pin Description and Typical Operating Circuits).
CDMA GPS
VCC GLNAOUT A1 GIF+ A2 GMXIN A3 GIFA4 CMXIN A5 CDMA IF
CLNAOUT B1
G1 B2
MODE B3 MAX2385 MAX2386 C3 G2
CIFB4
GND B5
VCC
GPS
GLNAIN C1
RBIAS C2
C4 CIF+ /2
LO_OUT C5 LO OUTPUT LO_IN D5
GND D1 CDMA
CLNAIN D2 VCC RBIAS
VCC D3
GND D4
BUFFEN
VCO
Figure 1. Typical Operating Circuit with CDMA and GPS Mixers Combined 10 ______________________________________________________________________________________
CDMA + GPS LNA/Mixers MAX2385/MAX2386
MODE MODE G2 MAX2385 MAX2386 G1 RSHUNT RBIAS RBIAS DSP MAX2385 MAX2386 G2 G1 DSP
RBIAS RBIAS RSHUNT
Figure 2. Variable Bias Current Application Circuit with Shunt Resistor (Using 4 DSP I/O Ports)
Figure 3. Variable Bias Current Application Circuit with Shunt Resistor and Transistor (Using 3 DSP I/O Ports)
Layout
For the MAX2385/MAX2386, keep RF signal lines as short as possible to minimize losses and radiation. Always use controlled-impedance lines on all high-frequency inputs and outputs and use low-inductance connections to ground on all GND pins. At the mixer outputs, keep the differential lines together and of the same length to ensure signal balance. For the best gain and noise performance, use high-Q (greater than 40) components for the LNA input matching circuit. For the power supplies, a star topology works well to isolate different sections of the device. Each VCC node has its own path to a central VCC; place decoupling capacitors that provide low impedance at the RF frequency of interest close to all VCC connections. The central VCC should have a large decoupling capacitor as well. (Use the MAX2385/MAX2386 EV kit as an example.)
ment. Operating Life and Moisture Resistance remain uncompromised as they are primarily determined by the wafer-fabrication process. Mechanical stress performance is a greater consideration for a UCSP. UCSP solder joint contact integrity must be considered since the package is attached through direct solder contact to the user's PC board. Testing done to characterize the UCSP reliability performance shows that it is capable of performing reliably through environmental stresses. Results of environmental stress tests and additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim's website, www.maxim-ic.com.
Chip Information
TRANSISTOR COUNT: 882
UCSP Reliability
The UCSP represents a unique package that greatly reduces board space compared to other packages. UCSP reliability is integrally linked to the user's assembly methods, circuit board material, and usage environ-
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Table 2. CDMA LNA Input/Output S-Parameters
(VCC = +2.75V, HGHL mode, PIN = -25dBm, TA = +25C.)
LNA (S11) FREQUENCY (MHz) MAGNITUDE PHASE 50 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 0.82104 0.79059 0.72668 0.67807 0.65661 0.64978 0.65829 0.67233 0.68999 0.702 0.71895 0.73319 0.74219 0.74866 0.74754 0.73605 0.70134 0.6582 0.6033 0.57173 0.58916 0.62231 0.65061 0.66787 0.6805 0.68889 0.68822 0.68522 0.67295 0.65681 0.6406 -18.917 -35.311 -61.742 -79.66 -91.203 -99.023 -104.2 -108.36 -111.47 -114.16 -116.44 -105.27 -106.33 -107.28 -108.6 -110.8 -112.49 -112.85 -111.43 -106.57 -101.57 -106.52 -107.79 -109.78 -112.17 -114.76 -117.18 -118.88 -119.94 -119.56 -116.75 LNA (S21) MAGNITUDE 15.163 14.116 11.39 8.9718 7.157 5.7084 4.7039 3.9155 3.2525 2.8111 2.3588 2.1266 1.825 1.6416 1.3985 1.2448 1.1067 0.95822 0.91231 0.88767 0.89238 0.87333 0.82724 0.75591 0.72192 0.69034 0.63968 0.62919 0.54062 0.57411 0.47351 PHASE 162.26 146.34 120.52 99.984 84.957 71.771 60.529 50.374 41.972 34.401 27.944 31.814 28.21 22.128 19.782 12.452 12.494 10.492 12.519 11.188 6.1977 -10.742 -15.813 -20.723 -29.025 -30.738 -40.185 -39.975 -53.183 -55.978 -68.632 LNA (S12) MAGNITUDE 0.008859 0.014972 0.022655 0.028431 0.033642 0.036502 0.038605 0.040918 0.041445 0.042523 0.042027 0.041601 0.039986 0.039224 0.036991 0.039238 0.045549 0.054447 0.067901 0.083089 0.08768 0.088886 0.08226 0.075059 0.075932 0.068259 0.069004 0.062396 0.065634 0.068559 0.073007 PHASE 61.194 56.033 49.886 41.627 37.358 32.065 27.6 22.124 20.385 15.732 15.121 22.198 24.408 23.437 34.906 38.898 49.797 48.936 49.382 39.015 26.514 5.5701 -1.5463 -8.1367 -12.349 -12.597 -18.123 -12.912 -19.789 -13.648 -23.644 LNA (S22) MAGNITUDE 0.93816 0.9 0.82915 0.76987 0.74408 0.73645 0.74107 0.74733 0.7488 0.7551 0.76309 0.7667 0.77436 0.77688 0.77974 0.77553 0.76585 0.74631 0.72062 0.7041 0.70733 0.72648 0.73464 0.74428 0.75146 0.76003 0.76771 0.77449 0.77681 0.77386 0.76331 PHASE -8.524 -15.727 -26.165 -33.613 -39.372 -44.949 -50.121 -55.876 -60.721 -65.167 -69.283 -63.916 -67.166 -70.727 -74.103 -77.75 -82.098 -86.403 -89.675 -91.673 -93.886 -113.38 -117.81 -121.46 -124.61 -126.98 -128.85 -129.87 -130.85 -130.5 -130.75
12
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Table 3. MAX2385 GPS LNA Input/Output S-Parameters
(VCC = +2.75V, PIN = -35dBm, TA = +25C.)
LNA (S11) FREQUENCY (MHz) MAGNITUDE PHASE 50 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 0.8881 0.87883 0.85269 0.82551 0.79436 0.78337 0.76465 0.75639 0.75274 0.74643 0.7484 0.75126 0.75045 0.75019 0.73538 0.73794 0.74538 0.74721 0.74474 0.74265 0.74108 0.73645 0.73726 0.74534 0.74851 0.7437 0.74111 0.73562 0.73762 0.73003 0.72034 -10.276 -19.876 -37.083 -51.884 -63.329 -72.116 -78.478 -83.373 -86.423 -88.842 -90.397 -84.499 -84.413 -85.343 -85.134 -85.398 -84.931 -85.902 -86.965 -87.91 -88.363 -102.43 -104.01 -105.62 -106.99 -109.08 -109.18 -109 -108.7 -107.33 -104.98 LNA (S21) MAGNITUDE 12.74 12.522 11.405 10.051 8.7681 7.5222 6.5198 5.7296 5.0437 4.5469 3.9871 3.7583 3.3761 3.153 2.8377 2.6311 2.5096 2.3007 2.2418 2.0474 1.9162 1.7839 1.6905 1.5469 1.429 1.4322 1.2847 1.348 1.1102 1.3082 1.1232 PHASE 171.11 162.24 147.59 133.59 123.73 114.72 107.75 101.89 97.629 93.487 90.549 87.421 86.774 82.014 82.496 76.473 77.268 74.063 72.75 69.84 65.908 49.151 47.571 47.693 42.865 43.875 39.437 42.59 37.712 37.893 35.283 LNA (S12) MAGNITUDE 0.000854 0.001371 0.00223 0.003701 0.002164 0.00311 0.001366 0.004057 0.004929 0.004204 0.005463 0.003834 0.007564 0.008098 0.008035 0.010423 0.011307 0.009457 0.016112 0.012632 0.015341 0.019307 0.020637 0.01424 0.022058 0.023264 0.029562 0.030335 0.031365 0.03709 0.036386 PHASE -46.423 -126.02 90.404 -15.896 -175.91 138.82 -24.339 161.18 120.97 -166.83 160.93 152.9 -171.16 175.38 163.28 169.5 154.83 -177.89 168.47 161.3 171.63 155.89 155.74 149.71 155.79 162.52 145.34 159.82 148.42 153.25 149.03 LNA (S22) MAGNITUDE 0.98314 0.97935 0.97791 0.94946 0.94573 0.9238 0.91664 0.89418 0.88958 0.87952 0.87286 0.87422 0.86435 0.85327 0.8562 0.85417 0.85631 0.84548 0.8355 0.83073 0.84221 0.84753 0.85656 0.85279 0.85584 0.85403 0.86433 0.86743 0.87149 0.88967 0.91018 PHASE -2.5681 -5.5591 -9.7614 -14.756 -19.049 -22.814 -26.61 -29.394 -31.893 -34.284 -36.748 -43.23 -46.442 -48.168 -50.651 -54.145 -57.714 -61.86 -65.064 -67.749 -70.646 -93.549 -96.187 -97.932 -99.37 -99.414 -98.503 -97.119 -94.704 -91.608 -88.371
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Table 4. MAX2386 GPS LNA Input/Output S-Parameters
(VCC = +2.75V, PIN = -35dBm, TA = +25C.)
LNA (S11) FREQUENCY (MHz) MAGNITUDE PHASE 50 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 0.93093 0.92289 0.89539 0.86825 0.84814 0.82959 0.80564 0.79496 0.78756 0.78142 0.76891 0.77088 0.76408 0.76674 0.75046 0.73704 0.74039 0.73209 0.72622 0.71876 0.70567 0.69916 0.69426 0.70075 0.68775 0.69363 0.68198 0.67769 0.66527 0.65156 0.62987 -9.9234 -19.653 -37.282 -52.517 -63.866 -73.038 -79.88 -85.049 -88.974 -91.371 -93.61 -89.176 -89.243 -89.051 -89.091 -88.676 -88.323 -88.526 -89.25 -89.705 -103.91 -104.37 -105.75 -106.94 -108.09 -107.69 -108.89 -107.45 -106.26 -105.01 -100.71 LNA (S21) MAGNITUDE 9.3584 9.2132 8.5374 7.726 6.875 5.9132 5.2466 4.6978 4.1138 3.7944 3.3492 3.0396 2.7793 2.6492 2.4207 2.2241 2.1385 1.977 1.9477 1.7977 1.642 1.5328 1.472 1.3837 1.2782 1.2919 1.1646 1.2674 1.0548 1.199 1.0408 PHASE 172.05 164.45 150.4 137.89 128.59 119.99 112.83 108.58 103.96 100.16 96.82 91.958 90.924 86.53 87.443 81.067 81.249 77.837 75.755 74.042 56.109 53.53 52.614 51.155 46.539 46.734 42.142 43.275 39.199 34.902 33.545 LNA (S12) MAGNITUDE 0.002323 0.000496 0.00225 0.003334 0.004084 0.001849 0.000774 0.00295 0.002164 0.004646 0.0015 0.004438 0.005482 0.008324 0.0095 0.01155 0.010586 0.004729 0.012002 0.018606 0.01812 0.019806 0.021388 0.023509 0.024414 0.02846 0.031474 0.038727 0.030616 0.040846 0.046665 PHASE -54.05 57.839 26.492 21.881 102.66 -140.39 148.15 170.05 122.22 139.17 74.177 168.05 160.32 -176.28 153.3 159.89 168.2 158.14 178.27 -174.16 159.5 146.88 155.43 155.3 161.94 157.24 152.73 157.21 158.41 155.88 149.57 LNA (S22) MAGNITUDE 0.99417 0.99682 0.99239 0.96568 0.96299 0.94258 0.91985 0.89936 0.88788 0.87917 0.86275 0.85671 0.84645 0.84257 0.83675 0.83713 0.83993 0.82256 0.81745 0.81525 0.82317 0.81154 0.83009 0.81304 0.83104 0.83166 0.83121 0.84505 0.85766 0.8744 0.88394 PHASE -1.8979 -4.5868 -8.855 -13.228 -17.715 -21.386 -25.462 -28.606 -30.729 -32.896 -34.722 -43.739 -45.813 -48.391 -50.311 -52.537 -55.649 -60.202 -63.505 -66.569 -85.615 -88.54 -91.792 -93.384 -93.847 -93.821 -92.19 -90.662 -88.492 -84.945 -82.392
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Table 5. CDMA Mixer Input S11
(V CC = +2.75V, HGHL mode, P IN = -25dBm, T A = +25C.)
FREQUENCY (MHz) 50 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 MIXER (S11) MAGNITUDE 0.93046 0.92412 0.90168 0.8875 0.87468 0.86943 0.86591 0.8607 0.85764 0.85557 0.85053 0.84695 0.82035 0.79503 0.76968 0.75583 0.72199 0.7057 0.68058 0.64409 0.61607 0.58273 0.55117 0.53115 0.52487 0.54332 0.57729 0.61971 0.6639 0.70686 0.74855 PHASE -6.6632 -13.133 -24.229 -32.661 -40.11 -45.949 -50.181 -53.579 -55.96 -57.434 -58.83 -35.068 -34.487 -32.441 -30.2 -27.952 -26.279 -25.567 -25.45 -27.348 -29.869 -33.144 -40.677 -50.662 -62.537 -73.998 -84.522 -92.905 -98.578 -101.6 -102.76
Table 6. CDMA Mixer Output Differential S11
(VCC = +2.75V, HGHL mode, PIN = -15dBm, TA = +25C.)
FREQUENCY (MHz) 10 100 200 300 400 500 600 700 800 900 1000 MIXER (S11) MAGNITUDE 1.00000 0.999402 1.00000 0.998319 0.997316 0.993268 0.987986 0.987624 0.980803 0.958863 0.900263 PHASE 0.002397 0.002001 0.0013 -0.00621 -0.01524 -0.03386 -0.05857 -0.10057 -0.15007 -0.24163 -0.37955
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15
CDMA + GPS LNA/Mixers MAX2385/MAX2386
Table 7. GPS Mixer Input S11
(VCC = +2.75V, PIN = -35dBm, TA = +25C.)
FREQUENCY (MHz) 50 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 2600 2700 2800 2900 3000 MIXER (S11) MAGNITUDE 0.95129 0.98072 0.7896 0.85569 0.86559 0.86298 0.86065 0.85671 0.83894 0.84149 0.82442 0.81692 0.80344 0.79181 0.77083 0.75552 0.72526 0.70046 0.66881 0.65244 0.64631 0.64566 0.66798 0.71 0.74633 0.74105 0.75438 0.78455 0.79948 0.82474 0.84153 PHASE -5.7747 -13.23 -17.621 -25.573 -32.411 -36.828 -40.63 -42.573 -44.002 -43.389 -29.719 -27.815 -26.796 -25.83 -25.385 -26.72 -29.415 -34.652 -40.769 -49.746 -60.826 -90.805 -102.61 -113.58 -123.91 -130.6 -132.27 -131.97 -130.92 -128.26 -124.77
Table 8. GPS Mixer Output Differential S11
(VCC = +2.75V, HGHL mode, PIN = -25dBm, TA = +25C.)
FREQUENCY (MHz) 10 100 200 300 400 500 600 700 800 900 1000 MIXER (S11) MAGNITUDE 1.00000 0.998001 1.00000 1.0000 0.997162 0.920826 0.989409 0.982752 0.975379 0.925681 0.755068 PHASE 0.002458 0.001452 -0.0011 -0.00689 -0.01806 -0.04242 -0.07002 -0.11838 -0.18777 -0.32983 -0.58182
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CDMA + GPS LNA/Mixers MAX2385/MAX2386
Table 9. CDMA LNA Typical Noise Parameters
(VCC = +2.75V, HGHL mode, TA = +25C, data from design simulation.)
FREQUENCY (MHz) 800 810 820 830 840 850 860 870 880 890 900 NFMIN (dB) 1.243 1.251 1.259 1.267 1.275 1.283 1.292 1.3 1.308 1.317 1.326 | OPT | 0.3512 0.3529 0.3547 0.3565 0.3583 0.36 0.3618 0.3636 0.3654 0.3672 0.369 OPT 96.93 97.7 98.47 99.23 99.98 100.7 101.5 102.2 102.9 103.6 104.3 RN () 8.528 8.522 8.516 8.511 8.506 8.501 8.496 8.491 8.487 8.483 8.479
Table 10. GPS LNA Typical Noise Parameters
(VCC = +2.75V, fRF = 1575.42MHz, HGHL mode, TA = +25C, data from design simulation.)
PART MAX2385 MAX2386 NFMIN (dB) 1.43 1.33 OPT 0.443 0.382 OPT 94.2 91.5 RN () 11.47 10.00
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17
CDMA + GPS LNA/Mixers MAX2385/MAX2386
Package Information
20L UCSP.EPS
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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