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LT5538 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
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FEATURES

DESCRIPTION
The LT(R)5538 is a 40MHz to 3800MHz monolithic logarithmic RF power detector, capable of measuring RF signals over a wide dynamic range, from -75dBm to 10dBm. The RF signal in an equivalent decibel-scaled value is precisely converted into DC voltage on a linear scale. The wide linear dynamic range is achieved by measuring the RF signal using cascaded RF limiters and RF detectors. Their outputs are summed to generate an accurate linear DC voltage proportional to the input RF signal in dBm. The LT5538 delivers superior temperature stable output (within 1dB over full temperature range) from 40MHz to 3.8GHz. The output is buffered with a low impedance driver.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Frequency Range: 40MHz to 3.8GHz 75dB Log Linear Dynamic Range Exceptional Accuracy over Temperature Linear DC Output vs. Input Power in dBm -72dBm Detection Sensitivity Single-ended RF Input Low Supply Current: 29mA Supply Voltage: 3V to 5.25V 8-lead DFN 3mm x 3mm package
APPLICATIONS

Received Signal Strength Indication (RSSI) RF Power Measurement and Control RF/IF Power Detection Receiver RF/IF Gain Control Envelope Detection ASK Receiver
TYPICAL APPLICATION
40MHz - 3.8GHz Logarithmic RF Detector
2.0 EN RF INPUT 56 1nF 1nF LT5538 ENBL IN+ IN- GND 9 OUT CAP+ CAP- VOUT (V) VCC
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Output Voltage and Linearity Error vs Input Power
VCC = 5V AT 880 MHz 3 2 LINEARITY ERROR (dB) 1 0 -1 TA = -40C TA = 25C TA = 85C -5 5
5538 TA02
VOUT
1.7 1.4 5V 0.1F 1.1 0.8 0.5
100pF
-2 -3
0.2 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm)
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LT5538 ABSOLUTE MAXIMUM RATINGS
(Note 1)
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PIN CONFIGURATION
TOP VIEW ENBL 1 IN+ 2 IN- 3 8 7 6 5 OUT CAP+ CAP- VCC
Power Supply Voltage ..............................................5.5V Enable Voltage .....................................-0.3V, VCC + 0.3V RF Input Power ....................................................15dBm Operating Ambient Temperature ............ -40C to +85C Storage Temperature Range................. -65C to +125C Maximum Junction Temperature........................... 150C
GND 4
DD PACKAGE 8-LEAD (3mm x 3mm) PLASTIC DFN JA = 43C/W EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH LT5538IDD#PBF TAPE AND REEL LT5538IDD#TRPBF PART MARKING LCVG PACKAGE DESCRIPTION 8-Lead (3mm x 3mm) Plastic DFN TEMPERATURE RANGE -40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL RF Input Input Frequency Range DC Common Mode Voltage Input Resistance fRF = 40 MHZ RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature PARAMETER
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C, VCC = 5V, ENBL = 5V. (Note 2)
CONDITIONS MIN TYP 40 to 3800 VCC -0.5 394 -75 to 10 1dB Linearity Error (Note 3) (Note 5) Normalized to Output at 25C PIN = -50dBm; -40C < TA < 85C PIN = -30dBm; -40C < TA < 85C PIN = -10dBm; -40C < TA < 85C 76 19.9 -87.5 -72

MAX
UNITS MHz V dBm dB mV/dB dBm dBm dB dB dB
0.1/0.6 -0.1/0.6 -0.2/0.6
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LT5538
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER 2nd Order Harmonic Distortion 3rd Order Harmonic Distortion fRF = 450 MHz RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature
The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C, VCC = 5V, ENBL = 5V. (Note 2)
CONDITIONS Pin = -10dBm; At RF Input Pin = -10dBm; At RF Input MIN TYP -62 -61 -75 to 10 1 dB Linearity Error (Note 3) (Note 5) Normalized to Output at 25C PIN = -50dBm; -40C < TA < 85C PIN = -30dBm; -40C < TA < 85C PIN = -10dBm; -40C < TA < 85C Pin = -10dBm; At RF Input Pin = -10dBm; At RF Input 75 19.6 -87.3 -71.5

MAX
UNITS dBc dBc dBm dB mV/dB dBm dBm dB dB dB dBc dBc dBm dB mV/dB dBm dBm dB dB dB dBc dBc dBm dB mV/dB dBm dBm dB dB dB dBm dB mV/dB dBm
0.1/0.6 0.1/0.5 -0.1/0.5 -43 -44 -75 to 10
2nd Order Harmonic Distortion 3rd Order Harmonic Distortion fRF = 880 MHz RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature
1 dB Linearity Error (Note 3) (Note 5) Normalized to Output at 25C PIN = -50dBm; -40C < TA < 85C PIN = -30dBm; -40C < TA < 85C PIN = -10dBm; -40C < TA < 85C Pin = -10dBm; At RF Input Pin = -10dBm; At RF Input
75 19.0 -88.8 -71.5

0.1/0.7 0.1/0.4 0.1/0.4 -37 -40 -72 to 10
2nd Order Harmonic Distortion 3rd Order Harmonic Distortion fRF = 2140 MHz RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature
1 dB Linearity Error (Note 3) (Note 5) Normalized to Output at 25C PIN = -50dBm; -40C < TA < 85C PIN = -30dBm; -40C < TA < 85C PIN = -10dBm; -40C < TA < 85C
70 17.7 -89.0 -69.0

0.3/0.4 0.4/0.1 0.7/0.5 -72 to 10
fRF = 2700 MHz RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept (Note 5) 1 dB Linearity Error (Note 3) 65 17.6 -87.5
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LT5538 ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER Sensitivity Output Variation vs Temperature Normalized to Output at 25C PIN = -50dBm; -40C < TA < 85C PIN = -30dBm; -40C < TA < 85C PIN = -10dBm; -40C < TA < 85C

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The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C, VCC = 5V, ENBL = 5V. (Note 2)
CONDITIONS MIN TYP -69.5 0.3/0.3 0.7/-0.3 1.1/-0.9 -65 to 10 1 dB Linearity Error (Note 3) (Note 5) Normalized to Output at 25C PIN = -45dBm; -40C < TA < 85C PIN = -25dBm; -40C < TA < 85C PIN = -5dBm; -40C < TA < 85C No RF Signal Present 57 18 -81.4 -63

MAX
UNITS dBm dB dB dB dBm dB mV/dB dBm dBm dB dB dB V mA A ns ns V
fRF = 3600 MHz RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature
0.6/-0.3 0.9/-0.6 1.4/-1.2 0.350 150 10 200
Output Interface Output DC Voltage Output Impedance Source Current Sink Current Rise Time Fall Time Power Up/Down ENBL = High (On) ENBL = Low (Off) ENBL Input Current Turn ON time Turn OFF Time Power Supply Supply Voltage Supply Current Shutdown Current ENBL = Low 3 29 1 5.25 36 100 V mA A VENBL = 5V

0.5V to 1.6V, 10% to 90%, fRF = 880 MHz 1.6V to 0.5V, 10% to 90%, fRF = 880 MHz 1
100 180
0.3 205 300 1
V A ns s
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Specifications over the -40C to 85C temperature range are assured by design, characterization and correlation with statistical process control. Note 3: The linearity error is calculated by the difference between the incremental slope of the output and the average slope from -50dBm
to -20dBm. The dynamic range is defined as the range over which the linearity error is within 1dB. Note 4: Sensitivity is defined as the minimum input power required for the linearity error within 3dB of the ideal log-linear transfer curve. Note 5: Logarithmic Intercept is an extrapolated input power level from the best-fitted log-linear straight line, where the output voltage is 0V.
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LT5538
TYPICAL PERFORMANCE CHARACTERISTICS
Supply Current vs Supply Voltage
40 35 SUPPLY CURRENT ICC (mA) 30 VOUT (V) 25 20 15 10 TA = -40C TA = 25C TA = 85C 2.5 3 5 3.5 4 4.5 SUPPLY VOLTAGE VCC (V) 5.5
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(Test Circuit shown in Figure 5) VOUT Variation vs Input Power at 40MHz
3 2 LINEARITY ERROR (dB) 1 0 -1 VOUT VARIATION (dB) 3 2 1 0 -1 -2 -3 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm) TA = -40C TA = 85C VCC = 5V NORMALIZED AT 25C
Output Voltage, Linearity Error vs Input Power at 40MHz
2.0 1.7 1.4 1.1 0.8 0.5 TA = -40C TA = 25C TA = 85C -5 5
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VCC = 5V
-2 -3
0.2 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm)
-5
5
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Output Voltage, Linearity Error vs Input Power at 450MHz
2.0 1.7 1.4 VOUT (V) 1.1 0.8 0.5 TA = -40C TA = 25C TA = 85C -5 5
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VOUT Variation vs Input Power at 450MHz
3 2 LINEARITY ERROR (dB) VOUT VARIATION (dB) 1 0 -1 -2 -3 3 2 1 0 -1 -2 -3 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm) TA = -40C TA = 85C VOUT (V) VCC = 5V NORMALIZED AT 25C 2.0 1.7 1.4 1.1 0.8 0.5
Output Voltage, Linearity Error vs Input Power at 880MHz
VCC = 5V 3 2 LINEARITY ERROR (dB) 1 0 -1 TA = -40C TA = 25C TA = 85C 5
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VCC = 5V
-2 -3
0.2 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm)
-5
5
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0.2 -75 -65 -55 -45 -35 -25 -15 -5 INPUT POWER (dBm)
VOUT Variation vs Input Power at 880MHz
3 2 VOUT VARIATION (dB) 1 VOUT (V) 0 -1 -2 -3 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm) TA = -40C TA = 85C 2.0 VCC = 5V NORMALIZED AT 25C 1.7 1.4 1.1 0.8 0.5
Output Voltage, Linearity Error vs Input Power at 2.14GHz
VCC = 5V 3 2 LINEARITY ERROR (dB) 1 0 -1 TA = -40C TA = 25C TA = 85C -5 5
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VOUT Variation vs Input Power at 2.14GHz
3 2 VOUT VARIATION (dB) 1 0 -1 -2 -3 -75 -65 -55 -45 -35 -25 -15 -5 INPUT POWER (dBm) TA = -40C TA = 85C VCC = 5V NORMALIZED AT 25C
-2 -3
-5
5
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0.2 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm)
5
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LT5538 TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage, Linearity Error vs Input Power at 2.7GHz
1.8 1.5 1.2 VOUT (V) 0.9 0.6 0.3 TA = -40C TA = 25C TA = 85C VCC = 5V 3 2 LINEARITY ERROR (dB) 1 0 -1 -2 -3 10 VOUT VARIATION (dB) 3 2 1 VOUT (V) 0 -1 -2 -3 -70 -60 -50 -40 -30 -20 -10 INPUT POWER (dBm) TA = -40C TA = 85C
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(Test Circuit shown in Figure 5) Output Voltage, Linearity Error vs Input Power at 3.6GHz
1.8 1.5 1.2 0.9 0.6 0.3 0 -65 -55 TA = -40C TA = 25C TA = 85C -45 -35 -25 -15 -5 INPUT POWER (dBm) 5
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VOUT Variation vs Input Power at 2.7GHz
VCC = 5V NORMALIZED AT 25C
VCC = 5V
3 2 LINEARITY ERROR (dB) 1 0 -1 -2 -3
0 -70 -60 -50 -40 -30 -20 -10 INPUT POWER (dBm)
0
0
10
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VOUT Variation vs Input Power at 3.6GHz
3 2 VOUT VARIATION (dB) 1 0 -1 -2 -3 -70 -60 -50 -40 -30 -20 -10 INPUT POWER (dBm) TA = -40C TA = 85C PERCENTAGE DISTRIBUTION (%) VCC = 5V NORMALIZED AT 25C 40 35 30 25 20 15 10 5 0 10 0
Slope Distribution vs Temperature at 2.14GHz
PERCENTAGE DISTRIBUTION (%) TA = -40C TA = 25C TA = 85C 16 14 12 10 8 6 4 2 16 16.8 17.6 18.4 19.2 SLOPE (mV/dB) 20 20.8
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Logarithmic Intercept Distribution vs Temperature at 2.14GHz
TA = -40C TA = 25C TA = 85C
0 -98 -96 -94 -92 -90 -88 -86 -84 -82 -80 -78 LOGARITHMIC INTERCEPT (dBm)
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Output Voltage, Linearity Error vs VCC @40MHz
2.0 NORMALIZED AT 5V 1.7 1.4 VOUT (V) 1.1 0.8 0.5 0.2 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm) VCC = 5V VCC = 3V -5 5
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Output Voltage, Linearity Error vs VCC @2140MHz
3 2 LINEARITY ERROR (dB) 1 0 -1 -2 -3 2.0 NORMALIZED AT 5V 1.7 1.4 VOUT (V) 1.1 0.8 0.5 0.2 -75 -65 -55 -45 -35 -25 -15 INPUT POWER (dBm) VCC = 5V VCC = 3V -5 5
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Output Voltage, Linearity Error vs VCC @3600MHz
3 2 LINEARITY ERROR (dB) 1 0 -1 -2 -3 1.8 VCC = 5V 1.5 1.2 VOUT (V) 0.9 0.6 0.3 0 -65 VCC = 5V VCC = 3V -55 -45 -35 -25 -15 -5 INPUT POWER (dBm) 5
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3 2 LINEARITY ERROR (dB) 1 0 -1 -2 -3
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LT5538
PIN FUNCTIONS
ENBL (Pin 1): Enable Pin. An applied voltage above 1V will activate the bias for the IC. For an applied voltage below 0.3V, the circuits will be shut down (disabled) with a corresponding reduction in power supply current. If the enable function is not required, then this pin can be connected to VCC. Typical enable pin input currents are 100A for EN = 3V and 200A for EN = 5V, respectively. Note that at no time should the ENBL pin voltage be allowed to exceed VCC by more than 0.3V. IN+ (Pin 2): RF Input Pin. The pin is internally biased to VCC -0.5V and should be DC blocked externally. The input is connected via internal 394 resistor to the IN- pin which should be connected to ground with an ac-decoupling capacitor. IN- (Pin 3): AC Ground Pin. The pin is internally biased to VCC -0.5V and coupled to ground via internal 20pF capacitor. This pin should be connected to ground with an external ac-decoupling capacitor for low frequency operation. GND (Pin 4, Exposed Pad Pin 9): Circuit Ground Return for the entire IC. This pin must be soldered to the printed circuit board ground plane. VCC (Pin 5): Power Supply Pin. This pin should be decoupled using 100pF and 0.1F capacitors. CAP-, CAP+ (Pins 6, 7): Optional Filter Capacitor Pins. These pins are internally connected to the detector outputs in front of the output buffer amplifier. An external low-pass filtering can be formed by connecting a capacitor to Vcc from each pin for filtering a low frequency modulation signal. See the Applications Information section for detail. OUT (Pin 8): Detector DC Output Pin.
BLOCK DIAGRAM
DC OFFSET CANCELLATION
5 VCC
IN+ 2 RF LIMITER IN- 3 RF LIMITER RF LIMITER RF LIMITER RF LIMITER
1 ENBL
RF DETECTOR CELLS
8 OUT
4
9
6
7
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GND
CAP- CAP+
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LT5538 APPLICATIONS INFORMATION
The LT5538 is a 40MHz to 3.8 GHz logarithmic RF power detector. It consists of cascaded limiting amplifiers and RF detectors. The output currents from every RF detector are combined and low-pass filtered before applied to the output buffer amplifier. As a result, the final DC output voltage approximates the logarithm of the amplitude of the input signal. The LT5538 is able to accurately measure an RF signal over a 70dB dynamic range (-68dBm to 2dBm at 2.1GHz) with 50 single-ended input impedance. The slope of linear to log transfer function is about 17.7mV/dB at 2.1GHz. Within the linear dynamic range, very stable output is achieved over the full temperature range from -40C to 85C and over the full operating frequency range from 40MHz to 3.8GHz. The absolute variation over temperature is typically within 1dB over 65dB dynamic range at 2.1GHz. RF INPUT The simplified schematic of the input circuit is shown in Figure 1. The IN+ and IN- pins are internally biased to VCC -0.5V. The IN- pin is internally coupled to ground via 20pF capacitor. An external capacitor of 1nF is needed to connect this pin to ground for low frequency operation. The impedance between IN+ and IN- is about 394. The RF input pin IN+ should be DC blocked when connected to ground or other matching components. A 56 resistor (R1) connected to ground will provide better than 10dB input return loss over the operating frequency range up to 1.5GHz. At higher operating frequency, additional LC
VCC 5.3k 5.3k
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matching elements are needed for a proper impedance matching to a 50 source as shown in Figure 2. Refer to Figure 6 for the circuit schematic of the input matching network. The input impedance vs frequency of the RF input port IN+ is detailed in Table 1.
Table 1. RF Input Impedance
FREQUENCY (MHz) 40 100 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 3400 3600 3800 RF INPUT IMPEDANCE () 47.3 + j129.7 246.6 + j210.7 408.7 - j37.8 192.9 - j190.9 105.6 - j158.4 69.3 - j127.4 51.8 - j106.2 41.5 - j90.9 34.2 - j78.7 29.2 - j60.0 25.4 - j60.7 22.6 - j53.8 20.5 - j47.7 18.9 - j42.4 17.9 - j37.6 17.1 - j33.4 16.4 - j29.5 16.1 - j26.0 15.9 - j22.8 15.9 - j20.0 15.9 - j17.5
0 -5 INPUT RETURN LOSS (dB) -10 -15 -20 -25 -30 W/O L1 AND C8 L1 = 1.5nH, C8 = 1pF C4, C11 = 12pF, C8 = 0.7pF 0 0.4 0.8 1.2 1.6 2 2.4 2.8 3.2 3.6 4.0 FREQUENCY (GHz)
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S11 MAG 0.800 0.790 0.785 0.772 0.756 0.737 0.720 0.707 0.697 0.687 0.678 0.669 0.659 0.649 0.638 0.627 0.615 0.602 0.589 0.574 0.560 ANGLE() 38.5 11.5 -1.5 -14.9 -25.3 -34.4 -42.7 -50.6 -58.2 -65.6 -73.1 -80.4 -87.7 -94.6 -101.5 -108.2 -114.7 -121.0 -127.0 -132.8 -137.9
IN+ 394 IN-
20p
+ -
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Figure 1. Simplified Schematic of the Input Circuit
Figure 2. Input Return Loss with Additional LC Matching Network
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LT5538
APPLICATIONS INFORMATION
OUTPUT INTERFACE The output interface of the LT5538 is shown in Figure 3. This output buffer circuit can source 10mA current to the load and sink 200 A current from the load. The smallsignal output bandwidth is approximately 4MHz when the output is resistively terminated or open. The full-scaled 10% to 90% rise and fall times are 100nS and 180nS, respectively. The output transient responses at varied input power levels are shown in Figure 4. When the part is enabled, the output impedance is about 150. When it is disabled, the output impedance is about 29.5k referenced to ground. EXTERNAL FILTERING AT CAP+, CAP- The CAP+ and CAP- Pins are internally biased at VCC -0.36V via a 200 resistor from voltage supply VCC as shown in Figure 3. These two pins are connected to the differential outputs of the internal RF detector cells. In combination with the 20pF in parallel, a low-pass filter is formed with -3dB corner frequency of 20MHz. The high frequency rectified signals (particularly second-order harmonic of the RF signal) from the detector cells are filtered and then the DC output is amplified by the output buffer amplifier. In some applications, the LT5538 may be used to measure a modulated RF signal with low frequency AM content (lower than 20MHz), a large modulation signal may be present at these two pins due to insufficient low-pass filtering, resulting in output voltage fluctuation at the LT5538's output. Its DC content may also vary depending upon the modulation frequency. To assure stable DC output of the LT5538, external capacitors C6 and C9 can be connected from CAP+ and CAP- to VCC to filter out this low frequency AM modulation signal. Assume the modulation frequency of the RF signal is fMOD, the capacitor value in Farads of C6 and C9 can be chosen by the following formula: C6 (or C9) 10/(2 * 200 * fMOD) Do not connect these two filtering capacitors to ground or any other low voltage reference at any time to avoid an abnormal start-up condition.
VCC 200 C6 C9 CAP+ CAP- 20p 200 100A
+ -
OUT 150
+ -
OUTPUT CURRENTS FROM RF DETECTORS LT5538 200A
+ -
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Figure 3. Simplified Schematic of the Output Interface
3.0 2.5 2.0 VOUT (V) 1.5 1.0 0.5 0 RF PULSE ON RF PULSE OFF
AT 880MHZ
6 2
RF PULSE ENABLE (V)
RF PULSE OFF
PIN = 0dBm PIN = 10dBm PIN = 20dBm -6 PIN = 30dBm PIN = 40dBm -10 PIN = 50dBm -14 -18 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 TIME (s)
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Figure 4. Simplified Circuit Schematic of the Output Interface
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LT5538 APPLICATIONS INFORMATION
ENBL (ENABLE) PIN OPERATION A simplified circuit schematic of the ENBL Pin is shown in Figure 5. The enable voltage necessary to turn on the LT5538 is 1V. The current drawn by the ENBL pin varies with the voltage applied at the pin. When the ENBL voltage is 3V, the ENBL current is typically 100 A. When the ENBL voltage is 5V, the ENBL current is increased to 200
VCC
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A. To disable or turn off the chip, this voltage should be below 0.3V. It is important that the voltage applied to the ENBL pin should never exceed VCC by more than 0.3V. Otherwise, the supply current may be sourced through the upper ESD protection diode connected at the ENBL pin. Under no circumstances should voltage be applied to the ENBL Pin before the supply voltage is applied to the VCC pin. If this occurs, damage to the IC may result.
ENBL
42k
42k
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Figure 5. Simplified Schematic of the Enable Circuit
TEST CIRCUIT
ENABLE L1 1.5nH C8 1pF RF INPUT
R4 4.99k C4 1 2 R1 56 1nF 3 C5 1nF 4 LT5538 ENBL IN+ IN- GND 9 OUT CAP+ CAP- VCC
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8 7 6 5 C9 OPT
R5 O C6 OPT C7 OPT VOUT
C2 100pF
C1 0.1F
C10 100pF
5V
Figure 6. Evaluation Board Circuit Schematic
40MHz to 2.7GHz
REF DES C1 C2, C10 C4, C5 C8 R1 R4 L1 VALUE 0.1F 100pF 1nF 1pF 56 4.99k 1.5nH SIZE 0603 0402 0603 0402 0402 0402 0402 PART NUMBER AVX 0603ZC104KAT AVX 0402YC101KAT AVX 0402ZC102K AVX 0402YA1ROCAT VISHAY, CRCW040256ROFKED VISHAY, CRCW04024K99FKED TOKO, LL1005-FH2IN5S
3.6GHz to 3.8GHz
REF DES C4, C11 C8 C5 VALUE 12pF 0.7pF OPEN SIZE 0402 0402 PART NUMBER MURATA, GRM155C1H120JZ01B MURATA, GJR155C1HR70BB01
NOTE: Replace L1 with C11.
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LT5538
TEST CIRCUIT
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Figure 7. Component Side of Evalution Board
PACKAGE DESCRIPTION
DD Package 8-Lead Plastic DFN (3mm x 3mm)
(Reference LTC DWG # 05-08-1698)
R = 0.115 TYP 5 0.675 0.05 0.38 0.10 8
3.5 0.05 1.65 0.05 2.15 0.05 (2 SIDES) PACKAGE OUTLINE 0.25 0.05 0.50 BSC 2.38 0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (NOTE 6)
3.00 0.10 (4 SIDES)
1.65 0.10 (2 SIDES)
(DD8) DFN 1203
0.200 REF
0.75 0.05
4 0.25 0.05 2.38 0.10 (2 SIDES)
1 0.50 BSC
0.00 - 0.05
BOTTOM VIEW--EXPOSED PAD NOTE: 1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1) 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE
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Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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LT5538 RELATED PARTS
PART NUMBER DESCRIPTION Infrastructure LT5514 LT5515 LT5516 LT5517 LT5518 LT5519 LT5520 LT5521 LT5522 LT5524 LT5525 LT5526 LT5527 LT5528 LT5557 LT5560 LT5568 LT5572 LT5575 Ultralow Distortion, IF Amplifier/ADC Driver with Digitally Controlled Gain COMMENTS
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850MHz Bandwidth, 47 dBm OIP3 at 100MHz, 10.5dB to 33dB Gain Control Range
1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 20dBm IIP3, Integrated LO Quadrature Generator 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 21.5dBm IIP3, Integrated LO Quadrature Generator 40MHz to 900MHz Quadrature Demodulator 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator 0.7GHz to 1.4GHz High Linearity Upconverting Mixer 1.3GHz to 2.3GHz High Linearity Upconverting Mixer 10MHz to 3700MHz High Linearity Upconverting Mixer 600 MHz to 2.7GHz High Signal Level Downconverting Mixer Low Power, Low Distortion ADC Driver with Digitally Programmable Gain High Linearity, Low Power Downconverting Mixer High Linearity, Low Power Downconverting Mixer 400MHz to 3.7GHz High Signal Level Downconverting Mixer 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator 400MHz to 3.8GHz, 3.3V High Signal Level Downconverting Mixer Ultra-Low Power Active Mixer 700MHz to 1050MHz High Linearity Direct Quadrature Modulator 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator 800MHz to 2.7GHz High Linearity Direct Conversion I/Q Demodulator RF Power Detectors with >40dB Dynamic Range 100kHz to 1000MHz RF Power Detector 300MHz to 7GHz RF Power Detector 300MHz to 3GHz RF Power Detector 300MHz to 7GHz Precision RF Power Detector 300MHz to 7GHz Precision RF Power Detector 300MHz to 7GHz Precision RF Power Detector 50MHz to 3GHz Log RF Power Detector with 60dB Dynamic Range Precision 600Mhz to 7GHz RF Power Detector with Fast Comparator Output Wide Dynamic Range Log RF/IF Detector 2.7GHz RMS Power Detector 21dBm IIP3, Integrated LO Quadrature Generator 22.8dBm OIP3 at 2GHz, -158.2dBm/Hz Noise Floor, 50 Single-Ended RF and LO Ports, 4-Channel W-CDMA ACPR = -64dBc at 2.14GHz 17.1dBm IIP3 at 1GHz, Integrated RF Output Transformer with 50 Matching, Single-Ended LO and RF Ports Operation 15.9dBm IIP3 at 1.9GHz, Integrated RF Output Transformer with 50 Matching, Single-Ended LO and RF Ports Operation 24.2dBm IIP3 at 1.95GHz, NF = 12.5dB, 3.15V to 5.25V Supply, SingleEnded LO Port Operation 4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz, NF = 12.5dB, 50 SingleEnded RF and LO Ports 450MHz Bandwidth, 40dBm OIP3, 4.5dB to 27dB Gain Control Single-Ended 50 RF and LO Ports, 17.6dBm IIP3 at 1900MHz, ICC = 28mA 3V to 5.3V Supply, 16.5dBm IIP3, 100kHz to 2GHz RF NF = 11dB, , ICC = 28mA, -65dBm LO-RF Leakage IIP3 = 23.5dBm and NF = 12.5dBm at 1900MHz, 4.5V to 5.25V Supply, ICC = 78mA, Conversion Gain = 2dB 21.8dBm OIP3 at 2GHz, -159.3dBm/Hz Noise Floor, 50, 0.5VDC Baseband Interface, 4-Channel W-CDMA ACPR = -66dBc at 2.14GHz IIP3 = 23.7dBm at 2600MHz, 23.5dBm at 3600MHz, ICC = 82mA at 3.3V 10mA Supply Current, 10dBm IIP3, 10dB NF Usable as Up- or Down-Converter. , 22.9dBm OIP3 at 850MHz, -160.3dBm/Hz Noise Floor, 50, 0.5VDC Baseband Interface, 3-Ch CDMA2000 ACPR = -71.4dBc at 850MHz 21.6dBm OIP3 at 2GHz, -158.6dBm/Hz Noise Floor, High-Ohmic 0.5VDC Baseband Interface, 4-Ch W-CDMA ACPR = -67.7dBc at 2.14GHz 50, Single-Ended RF and LO Inputs. 28dBm IIP3 at 900MHz, 13.2dBm P1dB, 0.04dB I/Q Gain Mismatch, 0.4 I/Q Phase Mismatch 300MHz to 3GHz, Temperature Compensated, 2.7V to 6V Supply 100kHz to 1GHz, Temperature Compensated, 2.7 to 6V Supply 44dB Dynamic Range, Temperature Compensated, SC70 Package 36dB Dynamic Range, Low Power Consumption, SC70 Package Precision VOUT Offset Control, Shutdown, Adjustable Gain Precision VOUT Offset Control, Shutdown, Adjustable Offset Precision VOUT Offset Control, Adjustable Gain and Offset 1dB Output Variation over Temperature, 38ns Response Time, Log Linear Response 25ns Response Time, Comparator Reference Input, Latch Enable Input, -26dBm to +12dBm Input Range Low Frequency to 1GHz, 83dB Log Linear Dynamic Range Fast Responding, up to 60dB Dynamic Range, 0.3dB Accuracy Over Temperature and Dynamic Range
5538f LT 0408 * PRINTED IN USA
RF Power Detectors LTC(R)5505 LTC5507 LTC5508 LTC5509 LTC5530 LTC5531 LTC5532 LT5534 LTC5536 LT5537 LT5570
12 Linear Technology Corporation
(408) 432-1900
1630 McCarthy Blvd., Milpitas, CA 95035-7417
FAX: (408) 434-0507 www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2008

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