LT5537EDDB#PBF Linear Technology, LT5537EDDB#PBF Datasheet

LT5537EDDB#PBF

Manufacturer Part Number
LT5537EDDB#PBF
Description
Manufacturer
Linear Technology
Datasheet

Specifications of LT5537EDDB#PBF

Pin Count
8
Screening Level
Industrial
Package Type
DFN
Lead Free Status / Rohs Status
Compliant

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Part Number:
LT5537EDDB#PBFLT5537EDDB#TRMPBF
Manufacturer:
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Quantity:
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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
RF IN
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
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
15nF
15nF
2
3
1
IN
IN
ENBL
+
BANDGAP REFERENCE
7k
U
AND BIASING
7k
DETECTOR CELLS
U
CANCELLATION
4
OPTIONAL
CAP
OFFSET
+
EXPOSED PAD
5
CAP
9
DESCRIPTIO
The LT
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.
All other trademarks are the property of their respective owners.
OUTPUT
BUFFER
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
7.2k
5537 is a wide dynamic range RF/IF detector,
OUT
V
5537 TA01a
V
Wide Dynamic Range
CC
EE
6
8
7
1nF
RF/IF Log Detector
U
1µF
2.4
2.0
1.6
1.2
0.8
0.4
Output Voltage, Linearity Error
0
–80
–40°C
vs Input Power at 200MHz
V
CC
= ENBL = 3V
85°C
–60
25°C
INPUT POWER (dBm)
–40
–20
LT5537
0
5537 TA01b
20
5537fa
1
3
2
1
0
–1
–2
–3

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LT5537EDDB#PBF Summary of contents

Page 1

... 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. OPTIONAL 4 ...

Page 2

LT5537 ABSOLUTE AXI U RATI GS (Note 1) Power Supply Voltage ........................................... 5.5V Enable Voltage ................................... –0.2V, V Input Power (Note 2) ......................................... 22dBm Operating Ambient Temperature Range .. – 40°C to 85°C Storage Temperature Range ................ ...

Page 3

ELECTRICAL CHARACTERISTICS PARAMETER f = 100MHz Linear Dynamic Range Slope Intercept Sensitivity Temperature Coefficient f = 200MHz Linear Dynamic Range Slope Intercept Sensitivity Temperature Coefficient f = 400MHz Linear Dynamic Range Slope Intercept Sensitivity Temperature Coefficient f = 600MHz Linear ...

Page 4

LT5537 ELECTRICAL CHARACTERISTICS PARAMETER Power Supply Supply Voltage Supply Current Shutdown Current 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 ...

Page 5

W U TYPICAL PERFOR A CE CHARACTERISTICS Output Voltage, Linearity Error vs Input Power at 10MHz 2 ENBL = 3V CC 2.0 25°C 1.6 85°C –40°C 1.2 0.8 0.4 0 –80 –60 –40 – INPUT POWER ...

Page 6

LT5537 W U TYPICAL PERFOR A CE CHARACTERISTICS Output Voltage, Linearity Error vs Input Power at 400MHz 3.0 2.5 85°C 25°C 2.0 –40°C 1.5 1.0 0 ENBL = –80 –60 –40 – INPUT ...

Page 7

CTIO S ENBL (Pin 1): Enable Pin. When the input voltage is higher than 1V, the circuit is ON. When the input voltage is less than 0.3V, or this pin is not connected, the chip ...

Page 8

LT5537 U U APPLICATIO S I FOR ATIO The LT5537 provides a log-linear relationship between an RF/IF input voltage and its output. The input signal is amplified successively by limiting amplifier stages. A series of detector cells rectify the signals ...

Page 9

U U APPLICATIO S I FOR ATIO Dynamic Range The LT5537 is capable of detecting and log-converting an input signal over a wide dynamic range. The range of the output voltage may be limited, however, and the monoto- nicity of ...

Page 10

LT5537 U U APPLICATIO S I FOR ATIO The 1:4 input transformer can also be replaced with a narrow band discrete balun circuit using three compo- nents as shown in Figure 6. Capacitors C11, C12 and inductor L1 form a ...

Page 11

U U APPLICATIO S I FOR ATIO AGILENT E4436B SIGNAL GENERATOR RF OUT J1 J2 POWER DIVIDER –30dB ATTENUATOR Baseband Response The unloaded bandwidth of the LT5537 output buffer is 10MHz. With 2.5pF loading, the output bandwidth is approximately 6MHz. ...

Page 12

LT5537 U U APPLICATIO S I FOR ATIO Table 3. Application Design Examples DESIGN INPUT NUMBER C1 POLE 1 15nF Open 8.5kHz 2 100pF 33nF 1.3MHz 3 5pF 390pF 20MHz 4 47nF 2.2µF 2.8kHz Bold = dominant pole ...

Page 13

U U APPLICATIO S I FOR ATIO Design 2 is the application circuit (Figure 13) used for characterization in this data sheet. This is a robust general purpose design which can operate as low as 1.3MHz. Optional filter capacitor (C6 ...

Page 14

LT5537 U U APPLICATIO S I FOR ATIO Enable Pin Operation The enable circuit of the LT5537 is shown in a simplified form in Figure 12. When the voltage at the ENBL pin is ≥1V, the enable circuit biases the ...

Page 15

... SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 16

... Input Range 17MHz Baseband Bandwidth, 40MHz to 500MHz IF, 1.8V to 5.25V Supply, –7dB to 56dB Linear Power Gain 500MHz BW S/H, 71.8dB SNR 500MHz BW S/H, 75.5dB SNR www.linear.com ● = 28mA CC = 28mA, CC 5537fa LT 0306 REV A • PRINTED IN THE USA © LINEAR TECHNOLOGY CORPORATION 2005 ...

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