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19-1282; Rev 0; 10/97
KIT ATION EVALU BLE AVAILA
Low-Noise, 2.5GHz Downconverter Mixer
____________________________Features
o 7.6dBm Input Third-Order Intercept Point o 10dB Downconverter Mixer Noise Figure o 7.9dB Gain o 400MHz to 2500MHz Wideband Operation o Low Cost o +2.7V to +5.5V Single-Supply Operation o <1A Shutdown Mode o Ultra-Small 10-Pin MAX Package
_______________General Description
The MAX2690 is a miniature, low-noise, low-power downconverter mixer designed for use in portable consumer equipment. Signals at the RF input port are mixed with signals at the local-oscillator (LO) port using a double-balanced mixer. The RF port frequency range is 400MHz to 2500MHz. The LO port frequency range is 700MHz to 2500MHz. The IF frequency range is 10MHz to 500MHz, provided the LO and RF frequencies are chosen appropriately. The IF port is differential, which provides good linearity and low LO emissions, as well as providing compatibility with applications using differential IF filters, such as CDMA cellular phones. The mixer noise figure is 10dB at 900MHz. The MAX2690 draws 16mA at VCC = 3V and operates from a +2.7V to +5.5V supply. A logic-controlled shutdown mode reduces the supply current to less than 1A, making it ideal for battery-operated equipment. This device is offered in a miniature 10-pin MAX package.
MAX2690
________________________Applications
2.45GHz Industrial-Scientific-Medical (ISM) Band Radios Wireless Local Area Networks (WLANs) Personal Communications Systems (PCS) Code-Division Multiple Access (CDMA) Communications Systems Cellular and Cordless Phones Hand-Held Radios
______________Ordering Information
PART MAX2690EUB TEMP. RANGE -40C to +85C PIN-PACKAGE 10 MAX
Typical Operating Circuit appears at end of data sheet.
__________________Pin Configuration
TOP VIEW
________________Functional Diagram
TOP VIEW
MAX2690
LGND 1 GND RFIN RFBYP VCC 2 3 4 5 10 SHDN 9 IFOUT+ IFOUTGNDLO LO LGND 1 GND RFIN RFBYP VCC 2 3 4 5 BIAS 10 SHDN 9 8 7 6 IFOUT+ IFOUTGNDLO LO
MAX2690
8 7 6
MAX
MAX
________________________________________________________________ Maxim Integrated Products
1
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Low-Noise, 2.5GHz Downconverter Mixer MAX2690
ABSOLUTE MAXIMUM RATINGS
VCC to GND ...........................................................-0.3V to +6.0V RFIN Input Power..............................................................10dBm LO Input Power .................................................................10dBm SHDN Input Voltage ...................................-0.3V to (VCC + 0.3V) Continuous Power Dissipation 10-Pin MAX (derate 4.1mW/C above +70C) ............330mW Operating Temperature Range MAX2690EUB ...................................................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +165C Lead Temperature (soldering, 10sec) .............................+300C
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 = +2.7V to +5.5V, no RF signals applied, LO = open, IFOUT+ = IFOUT- = VCC, SHDN = high, LGND = GND = GNDLO = 0V, TA = TMIN to TMAX. Typical values are at VCC = +3.0V and TA = +25C, unless otherwise noted. Minimum and maximum values are guaranteed by design and characterization over temperature.) PARAMETER Operating Supply Current Shutdown Input Voltage High Shutdown Input Voltage Low Shutdown Supply Current Shutdown Input Bias Current SHDN = 0V SHDN = low 0V < SHDN < VCC -5 4 0.4 2 25 CONDITIONS MIN 9.5 2 0.5 TYP 16 MAX 20.1 UNITS mA V V A A
AC ELECTRICAL CHARACTERISTICS
(MAX2690 EV kit; VCC = +3.0V; PLO = -3dBm; PRF = -25dBm; SHDN = high; RFIN matched for 900MHz, 1.95GHz, and 2.45GHz as noted below. Inductor connected from LGND to GND = 39nH for 900MHz operation, 27nH for 1.95GHz operation, and 6.8nH for 2.45GHz operation. TA = +25C, unless otherwise noted.) PARAMETER Conversion Gain (Note 1) Gain Variation over Temperature Input Third-Order Intercept CONDITIONS fRF = 900MHz, fLO = 1.1GHz fRF = 1.95GHz, fLO = 1.75GHz fRF = 2.45GHz, fLO = 2.1GHz fRF = 1.95GHz, TA = TMIN to TMAX (Note 2) Two tones at -25dBm per tone, fRF2 = 1MHz above fRF fRF = 900MHz, fLO = 1.1GHz fRF = 1.95GHz, fLO = 1.75GHz fRF = 2.45GHz, fLO = 2.1GHz MIN TYP 7.9 6.4 4 0.6 7.6 5.3 4.3 10 11.5 12 dB dBm 1.2 dB dB MAX UNITS
Noise-Figure Single Sideband
fRF = 900MHz, fLO = 1.1GHz fRF = 1.95GHz, fLO = 1.75GHz fRF = 2.45GHz, fLO = 2.1GHz
2
_______________________________________________________________________________________
Low-Noise, 2.5GHz Downconverter Mixer
AC ELECTRICAL CHARACTERISTICS (continued)
(MAX2690 EV kit; VCC = +3.0V; PLO = -3dBm; PRF = -25dBm; SHDN = high; RFIN matched for 900MHz, 1.95GHz, and 2.45GHz as noted below. Inductor connected from LGND to GND = 39nH for 900MHz operation, 27nH for 1.95GHz operation, and 6.8nH for 2.45GHz operation. TA = +25C, unless otherwise noted.) PARAMETER LO Emission at IF Port CONDITIONS fRF = 900MHz, fLO = 1.1GHz fRF = 1.95GHz, fLO = 1.75GHz fRF = 2.45GHz, fLO = 2.1GHz fRF = 900MHz, fLO = 1.1GHz LO Emission at RF Port fRF = 1.95GHz, fLO = 1.75GHz fRF = 2.45GHz, fLO = 2.1GHz IF/2 Spurious Response (Note 3) Turn-On Time Turn-Off Time fRF = 1.0GHz, fLO = 1.1GHz RF input = -15dBm (Note 4) (Note 4) fRF = 1.85GHz, fLO = 1.75GHz fRF = 2.275GHz, fLO = 2.1GHz MIN TYP -32 -32 -28 -30 -27 -25 -74 -62 -56 1 1.6 s s dBm dBm dBm MAX UNITS
MAX2690
Note 1: Consult the Applications Information section for information on designing a matching network. Note 2: Guaranteed by design and characterization. Note 3: This spurious response is caused by a higher-order mixing product (2x2). Specified RF frequency is applied and IF output power is observed at the desired IF frequency (200MHz for fRF = 900MHz, or 1.95GHz, and 350MHz for fRF = 2.45GHz). Note 4: From the time SHDN goes high to the time ICC reaches 90% of its final value (on), or from the time SHDN goes low to the time ICC drops below 10A (off).
_______________________________________________________________________________________
3
Low-Noise, 2.5GHz Downconverter Mixer MAX2690
__________________________________________Typical Operating Characteristics
(MAX2690 EV kit, VCC = +3.0V, PLO = -3dBm, PRF = -25dBm, fRF = 1.95GHz, fIF = 200MHz, SHDN = high, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2690toc01
SHUTDOWN SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2690toc02
CONVERSION GAIN vs. IF FREQUENCY
5.8 5.6 CONVERSION GAIN (dB) 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 fRF = 2.45GHz
MAX2690toc03
25 23 21 SUPPLY CURRENT (mA) 19 17 15 13 11 9 7 5 TA = +85C TA = +25C TA = -40C
1.6 SHDN = 0V SHUTDOWN SUPPLY CURRENT (A) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 TA = -40C TA = +85C TA = +25C
6.0
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 SUPPLY VOLTAGE (V)
2.7 3.0 3.3 3.6 3.9 4.2 4.5 4.8 5.1 5.4 5.7 SUPPLY VOLTAGE (V)
50
100
150
200
250
300
350
IF FREQUENCY (MHz)
CONVERSION GAIN vs. RF FREQUENCY
MAX2690toc04
NOISE FIGURE vs. RF FREQUENCY AND TEMPERATURE
MAX2690toc05
RF PORT IMPEDANCE vs. FREQUENCY
140 120 REAL IMPEDANCE () 100 80 60 40 REAL 20 0 -300 -350 500 1000 1500 FREQUENCY (MHz) 2000 2500 IMAGINARY
MAX2690toc06
10 8 CONVERSION GAIN (dB) 6 fIF = 200MHz
14 12 NOISE FIGURE (dB) 10 TA = +25C 8 6 4 2 0 TA = -40C fRF (MHz) 900 1950 2450 500 1000 1500 2000 fIF (MHz) 200 200 350 2500 TA = +85C
0 -50 -100 -150 -200 -250 IMAGINARY IMPEDANCE ()
4 2 0 -2 -4 -6 0 500 1000 1500 2000 2500 3000 RF FREQUENCY (MHz) fIF = 350MHz fIF = 200MHz
3000
RF FREQUENCY (MHz)
CONVERSION GAIN vs. LO POWER
MAX2690toc07
GAIN AND LINEARITY vs. LGND INDUCTOR VALUE
MAX2690toc08
LO PORT S11 vs. FREQUENCY
MAX2690toc09
10 8 6 GAIN (dB) 4 2 fRF = 1950MHz, fIF = 200MHz 0 -2 -4 -6 -15 -13 -11 -9 -7 -5 -3 -1 1 3 5 LO POWER (dBm) fRF = 2450MHz, fIF = 350MHz fRF = 900MHz, fIF = 200MHz
14 fRF = 1.95GHz GAIN AND LINEARITY (dB or dBm) 12 10 IIP3 8 6 4 2 0 0 12 27 OIP3
10 0 LO PORT S11 (dB) -10 -20 -30 -40 -50
GAIN
47
0
0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 FREQUENCY (GHz)
LGND INDUCTOR VALUE (nH)
4
_______________________________________________________________________________________
Low-Noise, 2.5GHz Downconverter Mixer
____________________________Typical Operating Characteristics (continued)
(MAX2690 EV kit, VCC = +3.0V, PLO = -3dBm, PRF = -25dBm, fRF = 1.95GHz, fIF = 200MHz, SHDN = high, TA = +25C, unless otherwise noted.)
IIP3 vs. RF FREQUENCY AND TEMPERATURE
MAX2690toc10
MAX2690
SINGLE-ENDED IF PORT EQUIVALENT SHUNT RC NETWORK
18 16 14 RESISTANCE (k) CAPACITANCE
MAX2690toc11
IF PORT OUTPUT SPECTRUM
4.0 3.5 OUTPUT POWER (dBm) 3.0 2.5 2.0 CAPACITANCE (pF) fRF = 900MHz -30 IF = 200MHz -40 -50 -60 RF -70 -80 -90 -100 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 FREQUENCY (GHz) 2LO - RF LO + RF 3LO - RF LO = 1.1GHz 2LO
MAX2690toc12
9.0 INPUT THIRD-ORDER INTERCEPT (dBm) 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 900 1300 1700 2100 TA = -40C TA = +25C TA = +85C fRF2 = 1MHz ABOVE fRF
4.5
-20
12 10 8 6 4 2 0 RESISTANCE
1.5 1.0 0.5 0
2500
1
125
250 FREQUENCY (MHz)
375
500
RF FREQUENCY (MHz)
INPUT 1dB COMPRESSION vs. RF FREQUENCY AND TEMPERATURE
MAX2690toc13
CONVERSION GAIN vs. SUPPLY VOLTAGE
9 8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 fRF = 2.95GHz, fIF = 350MHz fRF = 900MHz, fIF = 200MHz fRF = 1.95GHz, fIF = 200MHz
MAX2690toc14
-2 TA = +85C TA = +25C INPUT 1dB COMPRESSION (dBm) -3 TA = -40C -4 -5 -6 -7 -8 500 1000 1500 2000 2500 fRF (MHz) 900 1950 2450 fIF (MHz) 200 200 350
10
3000
0 2.0 2.5 3.0 3.5 4.0 VCC (V) 4.5 5.0 5.5 6.0
RF FREQUENCY (MHz)
INPUT IP3 vs. SUPPLY VOLTAGE
MAX2690toc15
CONVERSION GAIN vs. TEMPERATURE
8 CONVERSION GAIN (dB) 7 6 5 4 3 2 1 0 fRF = 2450MHz, fIF = 350MHz fRF = 900MHz, fIF = 200MHz fRF = 1950MHz, fIF = 200MHz
MAX2690toc16
10 9 8 INPUT IP3 (dBm) 7 6 5 4 3 2 1 0 2.0 2.5 3.0 3.5 4.0 VCC (V) 4.5 5.0 5.5 fRF = 2450MHz, fIF = 350MHz fRF = 900MHz, fIF = 200MHz
9
fRF = 1950MHz, fIF = 200MHz
6.0
-40
-20
0
20
40
60
80
100
TEMPERATURE (C)
_______________________________________________________________________________________
5
Low-Noise, 2.5GHz Downconverter Mixer MAX2690
________________________________________________Key Specification Statistics
(MAX2690 EV kit, VCC = +3.0V, PLO = -3dBm, PRF = -25dBm, fRF = 1.95GHz, fIF = 200MHz, SHDN = high, TA = +25C, unless otherwise noted.) Histograms represent measured data from a 30-unit sample taken from one wafer lot. The Gaussian curve is calculated for the measured data's mean and standard deviation and is scaled to account for process variations (the listed mean and standard deviation are from the scaled distribution, as plotted).
GAIN (+85C)
1.2 PROBABILITY DENSITY FUNCTION 1.0 0.8 0.6 0.4 0.2 0 3.0 3.8 4.6 5.4 GAIN (dB) 6.2 7.0 7.8
MAX2690toc17
INPUT IP3 (+85C)
18 15 12 9 6 3 0 PROBABILITY DENSITY FUNCTION x = 5.76dB = 0.338dB 1.2 1.0 0.8 0.6 0.4 0.2 0 3.4 4.2 5.0 5.8 6.6 7.4 INPUT IP3 (dBm)
MAX2690toc18
x = 5.55dB = 0.347dB
18 15 12 9 6 3 0
N0. OF UNITS
GAIN (+25C)
1.6 PROBABILITY DENSITY FUNCTION 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 4.8 5.2 5.6 6.0 6.4 6.8 7.2 7.6 8.0 GAIN (dB)
MAX2690toc19
INPUT IP3 (+25C)
32 PROBABILITY DENSITY FUNCTION 28 24 NO. OF UNITS 20 16 12 8 4 0 1.2 1.0 0.8 0.6 0.4 0.2 0 2.9 3.7 4.5 5.3 6.1 6.9 7.7 INPUT IP3 (dBm)
MAX2690toc20
24 20 16 12 8 4 0
x = 6.37dB = 0.257dB
x = 5.25dB = 0.390dB
GAIN (-40C)
1.50 PROBABILITY DENSITY FUNCTION 1.25 1.00 0.75 0.50 0.25 0 5.4 5.8 6.2 6.6 7.0 7.4 7.8 8.2 8.6 GAIN (dB)
MAX2690toc21
INPUT IP3 (-40C)
x = 7.00dB = 0.272dB 30 PROBABILITY DENSITY FUNCTION 25 20 15 10 5 0 1.2 1.0 0.8 0.6 0.4 0.2 0 2.0 2.8 3.6 4.4 5.2 6.0 6.8 INPUT IP3 (dBm)
MAX2690toc22
18 15 12 9 6 3 0
x = 4.63dB = 0.347dB
6
_______________________________________________________________________________________
NO. OF UNITS
N0. OF UNITS
N0. OF UNITS
NO. OF UNITS
Low-Noise, 2.5GHz Downconverter Mixer
______________________________________________________________Pin Description
PIN 1 NAME LGND FUNCTION Inductive Degeneration Pin. For maximum linearity, connect LGND directly to ground with no series inductance. Trade off linearity for gain by increasing the series inductance from LGND to ground. See the Applications Information section for more information. RF Ground. This pin must have a separate via to the ground plane, as close to the pin as possible to minimize inductance. RF Input Port. RF Input of Downconverter Mixer. See the Applications Information section for details on matching to RFIN. RF Bypassing Capacitor Pin. Bypass RFBYP with an appropriate-value capacitor (typically 1000pF) to ground. Supply-Voltage Input, +2.7V to +5.5V. Connect 0.1F and 1000pF capacitors (in parallel) between VCC and GND. Local-Oscillator Input. LO should be AC coupled and presents a 50 load impedance. See the Applications Information section for more information. Ground for the LO Port. This pin must have its own via to the ground plane, as close as possible to the pin to minimize inductance. Differential IF Inverting Output. IFOUT- is an open-collector output and must be pulled up to VCC with an external inductor for proper biasing. A resistor in parallel with the inductor may also be used to set a terminating impedance. See the Typical Operating Characteristics section for a plot of IF port characteristics vs. frequency (see plot titled Single-Ended IF Port Equivalent Shunt RC Network). Differential IF Noninverting Output. IFOUT+ is an open-collector output and must be pulled up to VCC with an external inductor for proper biasing. A resistor in parallel with the inductor may also be used to set a terminating impedance. See the Typical Operating Characteristics section for a plot of IF port characteristics vs. frequency (see plot titled Single-Ended IF Port Equivalent Shunt RC Network). Active-Low Shutdown Input. A digital logic-low level at SHDN deactivates all part functions and reduces the supply current to typically 0.4A.
MAX2690
2 3 4 5 6 7
GND RFIN RFBYP VCC LO GNDLO
8
IFOUT-
9
IFOUT+
10
SHDN
_______________Detailed Description
The MAX2690 is a 2.5GHz, double-balanced downconverter mixer designed to provide optimum intermodulation performance for a given supply current. It consists of a double-balanced Gilbert-cell mixer with singleended RF and LO port connections, and a differential IF port. An on-chip bias cell provides a low-power shutdown feature.
IF Output
The IFOUT+ and IFOUT- pins form the MAX2690's differential open-collector IF output. The IF output is coupled to the load using shunt inductors to VCC and series capacitors to the load. Most applications use a resistive termination of 500 (typical) resistors in parallel with the pull-up inductors to set a terminating impedance. The part's conversion gain has been specified with the resistors in place (using the output network on the MAX2690 EV kit), accounting for a 3dB loss due to the resistors. Therefore, it is possible to achieve an increase in gain with a properly designed matching network. However, the resistors provide for minimum passband ripple when this port is connected to typical IF filters.
RF Input
The RFIN and RFBYP pins form the MAX2690's RF input. The single-ended RF input signal is applied to the RFIN pin (refer to the RF Port Impedance vs. Frequency graph in the Typical Operating Characteristics). The RFBYP pin should be AC grounded typically with a 1000pF capacitor. This capacitor value should present a low impedance at both the RF and IF frequencies.
Bias
The bias cell includes compensation circuitry to minimize conversion-gain variations over temperature as well as shutdown control circuitry. The SHDN pin can be used to disable all functions and reduce supply current to typically 0.4A.
_______________________________________________________________________________________
7
Low-Noise, 2.5GHz Downconverter Mixer MAX2690
__________Applications Information
Local-Oscillator (LO) Input
The LO input is a single-ended broadband 50 input with a return loss of better than 10dB from 900MHz to 3GHz, improving at high frequency. For lower-frequency LO operation, a shunt resistor can be used to improve the LO port match (see the Typical Operating Circuit for more information). AC couple to LO. The LO signal is mixed with the input RF signal, and the resulting downconverted output appears on the IFOUT+ and IFOUT- pins. plane. Low-inductance ground connections and controlled-impedance lines should be used in the layout. To minimize noise on the internal bias cell, SHDN should be decoupled with a 1000pF capacitor to ground. A series resistor (typically 100) can also be used to reduce high-frequency signals coupling into the SHDN pin.
Inductive Degeneration Pin (LGND)
A series inductor is typically connected from LGND to GND. Adjusting the value of this inductor allows the MAX2690 to be set to the optimum gain and linearity point for a particular application. A short from LGND to ground provides maximum linearity. Increasing the inductor value trades off linearity for gain. A large inductor provides maximum gain. See the Typical Operating Characteristics for a graph of conversion gain and linearity for several inductor values. The inductor's self-resonant frequency (SRF) should be as close as possible to or above the desired RF frequency for optimal performance.
RF Input
The typical RF input frequency range is 400MHz to 2.5GHz. For optimum performance, the RF input requires an impedance-matching network. Consult Table 1 as well as the RF Port Impedance vs. Frequency graph in the Typical Operating Characteristics.
Table 1. RF Input Impedance
FREQUENCY PART 900MHz Series Z Equivalent Shunt R Equivalent Shunt C 45 - j 219 1100 0.7pF 1.95GHz 20 - j 110 630 0.7pF 2.45GHz 18 - j 85 400 0.7pF
______________________Layout Issues
A well-designed PC board is an essential part of an RF circuit. For best performance, pay attention to powersupply issues as well as the layout of the RFIN matching network.
Power-Supply Layout
To minimize coupling between different sections of the IC, the ideal power-supply layout is a star configuration, which has a large decoupling capacitor at a central VCC node. The VCC traces branch out from this node, each going to a separate VCC node in the MAX2690 circuit. At the end of each of these traces is a bypass capacitor that is good at the RF frequency of interest. This arrangement provides local decoupling at each VCC pin. At high frequencies, any signal leaking out one supply pin sees a relatively high impedance (formed by the VCC trace inductance) to the central VCC node, and an even higher impedance to any other supply pin, as well as a low impedance to ground.
IF Output
The IF output frequency range is typically 10MHz to 500MHz. The IFOUT+ and IFOUT- pins require external inductors to VCC for proper biasing. These outputs are high-impedance open collectors. In many applications, the biasing inductors have resistors in parallel with them to set an output impedance. Alternatively, a resistor between IFOUT+ and IFOUT- may be used. Consult the Typical Operating Characteristics section for more information. For single-ended operation, the IFOUT- pin can be tied directly to VCC.
Matching-Network Layout
The layout of the RFIN matching network can be very sensitive to parasitic circuit elements. To minimize parasitic inductance, keep all traces short, and place components as close to the chip as possible. To minimize parasitic capacitance, a cut-out in the ground plane (and any other planes) below the matching network components can be used.
Power Supply and Bypassing
Proper attention to supply bypassing is essential for a high-frequency RF circuit. VCC (pin 5) must be properly bypassed with a 0.1F capacitor in parallel with 1000pF to ground. Separate vias to the ground plane are needed for each of the bypass capacitors, as well as minimal trace length to reduce inductance. Each ground pin should have a separate via to the ground
8
_______________________________________________________________________________________
Low-Noise, 2.5GHz Downconverter Mixer
___________________________________________________Typical Operating Circuit
MAX2690
27nH
1
LGND
SHDN
10 1000pF VCC
100
SHUTDOWN CONTROL
1pF RF INPUT 1pF
3.3nH 0.5pF
3
MAX2690
RFIN 500 220nH 1000pF
4 RF = 1.95GHz VCC 5 0.1pF 1000pF 1000pF
RFBYP
IFOUT+ IFOUT-
9 8 500 220nH IF OUTPUT TO IF FILTER IF = 200MHz
VCC GND 2 LO 6 GNDLO 7
LO INPUT ROPTIONAL (SEE TEXT) 1000pF
VCC
1000pF
_______________________________________________________________________________________
9
Low-Noise, 2.5GHz Downconverter Mixer MAX2690
________________________________________________________Package Information
10LUMAXB.EPS
10
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