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Linear Technology Electronic Components Datasheet

LT5537 Datasheet

Wide Dynamic Range RF/IF Log Detector

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LT5537 pdf
FEATURES
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
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
RF IN
15nF
IN+
2
15nF
IN
3
OPTIONAL
4
CAP+
5
CAP
OFFSET
CANCELLATION
DETECTOR CELLS
ENBL
1
BANDGAP REFERENCE
AND BIASING
EXPOSED PAD
9
LT5537www.DataSheet4U.com
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 50input). 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.
VCC
6
OUTPUT
BUFFER
OUT
8
7.2k
VEE
7
5537 TA01a
Output Voltage, Linearity Error
vs Input Power at 200MHz
2.4 3
2.0
1nF 1µF
1.6
85°C
25°C
1.2 –40°C
2
1
0
0.8 –1
0.4 –2
VCC = ENBL = 3V
0
–80 –60 –40
–20
INPUT POWER (dBm)
0
–3
20
5537 TA01b
5537fa
1


Linear Technology Electronic Components Datasheet

LT5537 Datasheet

Wide Dynamic Range RF/IF Log Detector

No Preview Available !

LT5537 pdf
LT5537
ABSOLUTE AXI U RATI GS
(Note 1)
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
www.DataSheet4U.com
UW U
PACKAGE/ORDER I FOR ATIO
TOP VIEW
ENBL 1
8 OUT
IN+ 2
7 VEE
IN3 9 6 VCC
CAP+ 4
5 CAP
DDB PACKAGE
8-LEAD (3mm ´ 2mm) PLASTIC DFN
θJA = 76°C/W
EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LT5537EDDB
LBJR
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS VCC = 3V, ENBL = 3V, TA = 25°C, unless otherwise specified. (Notes 3, 4)
PARAMETER
Signal Input
Input Frequency Range
Maximum Input Power for Monotonic Output
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
CONDITIONS
(Note 5)
50Termination
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
MIN TYP MAX
10 to 1000
14.0
11.6
9.4
VCC – 0.4
1.73k//1.45pF
88.8
72.5
19.6
– 97
–76.7
– 0.007
90.6
81.0
20
– 96
–77.2
– 0.005
UNITS
MHz
dBm
dBm
dBm
V
dB
dB
mV/dB
dBm
dBm
dB/°C
dB
dB
mV/dB
dBm
dBm
dB/°C
5537fa
2


Part Number LT5537
Description Wide Dynamic Range RF/IF Log Detector
Maker Linear Technology
Total Page 16 Pages
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LT5537 pdf
LT5537 Datasheet PDF
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