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LT5537
FEATURES
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Wide Dynamic Range RF/IF Log Detector DESCRIPTIO
The LT®5537 is a wide dynamic range RF/IF detector, operational from below 10MHz to 1000MHz. The lower limit of the operating frequency range can be extended to near DC by the use of an external capacitor. The input dynamic range at 200MHz with ±3dB nonlinearity is 90dB (from –76dBm to 14dBm, single-ended 50Ω input). The detector output voltage slope is nominally 20mV/dB, and the typical temperature coefficient is 0.01dB/°C at 200MHz.
, LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Low Frequency to 1000MHz Operation 83dB Dynamic Range with ±1dB Nonlinearity at 200MHz Sensitivity –76dBm or Better at 200MHz Log-Linear Transfer Slope of 20mV/dB Supply Voltage Range: 2.7V to 5.25V Supply Current: 13.5mA at 3V Tiny 8-Lead (3mm × 2mm) DFN Package
U APPLICATIO S
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Linear-to-Log Signal Level Conversion Received Signal Strength Indication (RSSI) RF Power Control RF/IF Power Detection Receiver RF/IF Gain Control Envelope Detection ASK Receiver
TYPICAL APPLICATIO
7k 7k
OPTIONAL
4 CAP+
5 CAP–
15nF RF IN 15nF 3 IN 2 IN
OFFSET CANCELLATION
+
VCC
6 1nF 1µF
VOUT (V)
–
DETECTOR CELLS
OUTPUT BUFFER
OUT 7.2k VEE
8
0 –80 VCC = ENBL = 3V –60 –40 –20 0 INPUT POWER (dBm) 20
5537 TA01b
1
ENBL
BANDGAP REFERENCE AND BIASING EXPOSED PAD 9
7
5537 TA01a
U
U
Output Voltage, Linearity Error vs Input Power at 200MHz
2.4 2.0 85°C 1.6 1.2 0.8 0.4 –40°C 25°C 3 2
LINEARITY ERROR (dB)
1 0 –1 –2 –3
5537fa
1
LT5537
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ABSOLUTE
(Note 1)
AXI U
RATI GS
U U W PACKAGE/ORDER I FOR ATIO
TOP VIEW ENBL 1 IN+ 2 IN– 3 CAP+ 4 9 8 7 6 5 OUT VEE VCC CAP–
Power Supply Voltage ........................................... 5.5V Enable Voltage ................................... –0.2V, VCC + 0.2V Input Power (Note 2) ......................................... 22dBm Operating Ambient Temperature Range .. – 40°C to 85°C Storage Temperature Range ................ – 65°C to 125°C Maximum Junction Temperature ......................... 125°C
ELECTRICAL CHARACTERISTICS
PARAMETER Signal Input Input Frequency Range Maximum Input Power for Monotonic Output (Note 5)
CONDITIONS
50Ω Termination 200MHz 600MHz 1GHz Measured at 200MHz ±3dB Error ±1dB Error R1 = 33k (Note 8) VOUT = 0V, Extrapolated (Notes 3, 7) PIN = –20dBm ±3dB Error ±1dB Error R1 = 33k (Note 8) VOUT = 0V, Extrapolated (Notes 3, 7) PIN = –20dBm
DC Common Mode Voltage Small-Signal Impedance f = 10MHz Linear Dynamic Range Slope Intercept Sensitivity Temperature Coefficient f = 50MHz Linear Dynamic Range Slope Intercept Sensitivity Temperature Coefficient
2
U
W W
W
DDB PACKAGE 8-LEAD (3mm ´ 2mm) PLASTIC DFN
θJA = 76°C/W EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB
ORDER PART NUMBER LT5537EDDB
DDB PART MARKING LBJR
Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Ree.