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Analog Devices Semiconductor Electronic Components Datasheet

AD641 Datasheet

250 MHz Demodulating Logarithmic Amplifier

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AD641 pdf
a
250 MHz Demodulating
Logarithmic Amplifier
AD641
FEATURES
Logarithmic Amplifier Performance
Usable to 250 MHz
44 dB Dynamic Range
؎2.0 dB Log Conformance
37.5 mV/dB Voltage Output
Stable Slope and Intercepts
2.0 nV/Hz Input Noise Voltage
50 V Input Offset Voltage
Low Power
؎5 V Supply Operation
9 mA (+VS), 35 mA (–VS) Quiescent Current
Onboard Resistors
Onboard 10؋ Attenuator
Dual Polarity Current Outputs
Direct Coupled Differential Signal Path
APPLICATIONS
IF/RF Signal Processing
Received Signal Strength Indicator (RSSI)
High Speed Signal Compression
High Speed Spectrum Analyzer
ECM/Radar
PRODUCT DESCRIPTION
The AD641 is a 250 MHz, demodulating logarithmic amplifier
with an accuracy of ± 2.0 dB and 44 dB dynamic range. The
AD641 uses a successive detection architecture to provide an
output current that is logarithmically proportional to its input
voltage. The output current can be converted to a voltage using
one of several on-chip resistors to select the slope. A single
AD641 provides up to 44 dB of dynamic range at speeds up to
250 MHz, and two cascaded AD641s together can provide
58 dB of dynamic range at speeds up to 250 MHz. The AD641
is fully stable and well characterized over either the industrial or
military temperature ranges.
The AD641 is not a logarithmic building block, but rather a
complete logarithmic solution for compressing and measuring
wide dynamic range signals. The AD641 is comprised of five
stages and each stage has a full wave rectifier, whose current
depends on the absolute value of its input voltage. The output
of these stages are summed together to provide the demodulated
output current scaled at 1 mA per decade (50 µA/dB).
Without utilizing the 10× input attenuator, log conformance of
2.0 dB is maintained over the input range –44 dBm to 0 dBm.
The attenuator offers the most flexibility without significantly
impacting performance.
PIN CONFIGURATIONS
20-Lead Plastic DIP (N)
20-Lead Cerdip (Q)
–INPUT 1
20 +INPUT
ATN LO 2
19 ATN OUT
ATN COM 3
18 CKT COM
ATN COM 4
17 RG1
ATN IN
BL1
–VS
5 AD641 16 RG0
6 TOP VIEW 15 RG2
(Not to Scale)
7 14 LOG OUT
ITC 8
13 LOG COM
BL2 9
–OUTPUT 10
12 +VS
11 +OUTPUT
20-Lead PLCC (P)
ATN COM 4
ATN IN 5
BL1 6
–VS 7
ITC 8
3 2 1 20 19
PIN 1
18 CKT COM
IDENTIFIER
AD641
TOP VIEW
17 RG1
16 RG0
(Not to Scale)
15 RG2
14 LOG OUT
9 10 11 12 13
The 250 MHz bandwidth and temperature stability make this
product ideal for high speed signal power measurement in RF/
IF systems. ECM/Radar and Communication applications are
routinely in the 100 MHz–180 MHz range for power measure-
ment. The bandwidth and accuracy, as well as dynamic range,
make this part ideal for high speed, wide dynamic range signals.
The AD641 is offered in industrial (–40°C to +85°C) and mili-
tary (–55°C to +125°C) package temperature ranges. Industrial
versions are available in plastic DIP and PLCC; MIL versions
are packaged in cerdip.
REV. C
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1999


Analog Devices Semiconductor Electronic Components Datasheet

AD641 Datasheet

250 MHz Demodulating Logarithmic Amplifier

No Preview Available !

AD641 pdf
AD641–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS (VS = ؎5 V; TA = +25؇C, unless otherwise noted)
Parameter
Conditions
AD641A
Min Typ Max
AD641S
Min Typ
Max
Units
TRANSFER FUNCTION1
LOG AMPLIFIER PERFORMANCE
3 dB Bandwidth
Voltage Compliance Range
Slope Current, IY
Accuracy vs. Temperature
Over Temperature
Intercept dBm
Over Temperature
Zero Signal Output Current2
ITC Disabled
Maximum Output Current
TMIN to TMAX
250 MHz
TMIN to TMAX, 250 MHz
Pin 8 to COM
(IOUT = IY LOG |VIN/VX|for VIN = 0.75 mV to ±200 mV dc)
250
–0.3 +VS – 1
0.98 1.00 1.02
0.002
–40.84 –40.43 –39.96
–0.2
–0.27
2.3
250
–0.3
0.98 1.00
0.002
0.98
–40.84 –40.43
–40.59
–0.2
–0.27
+VS – 1
1.02
1.02
–39.96
–39.47
2.3
MHz
V
mA
%/°C
mA
dBm
dBm
mA
mA
mA
DYNAMIC RANGE
Single Configuration
Over Temperature
Dual Configuration
Over Temperature
LOG CONFORMANCE
Single Configuration
Over Temperature
Dual Configuration
Over Temperature
LIMITER CHARACTERISTICS
Flatness
Phase Variation
TMIN to TMAX
TMIN to TMAX
f = 250 MHz
–44 dBm to 0 dBm
–42 dBm to –4 dBm; TMIN to TMAX
–42 dBm to –2 dBm, TMIN to TMAX
S: –60 dBm to –2 dBm;
A: –56 dBm to –4 dBm, TMIN to TMAX
–44 dBm to 0 dBm @ 10.7 MHz
–44 dBm to 0 dBm @ 10.7 MHz
44
40
58
52
± 0.5 ± 2.0
± 1.0
± 0.5
± 1.0
± 2.5
± 2.0
± 2.5
± 1.6
± 2.0
44
38
58
52
± 0.5
± 1.0
± 0.5
± 1.0
± 1.6
± 2.0
± 2.0
± 2.5
± 2.0
± 2.5
dB
dB
dB
dB
dB
dB
dB
dB
dB
Degrees
INPUT CHARACTERISTICS
Input Resistance
Input Offset Voltage
vs. Temperature
Over Temperature
vs. Supply
Input Bias Current
Input Bias Offset
Common Mode Input Range
Differential
Differential
TMIN to TMAX
500 500 k
50 200
50 200 µV
0.8 0.8 µV/°C
300 µV
2 2 µV/V
7 25
7 25 µA
1 1 µA
–2 +0.3 –2
+0.3 V
SIGNAL INPUT (Pins 1, 20)
Input Capacitance
Noise Spectral Density
Tangential Sensitivity
Either Pin to COM
1 kHz to 10 MHz
BW = 100 MHz
2 2 pF
2 2 nV/Hz
–72 –72 dBm
INPUT ATTENUATOR
(Pins 2, 3, 4, 5 & 19)
Attenuation3
Input Resistance
Pins 5 to Pin 19
Pins 5 to 3/4
20 20 dB
300 300
APPLICATION RESISTORS
(Pins 15, 16, 17)
0.995 1.000 1.005 0.995 1.000 1.005 k
OUTPUT CHARACTERISTICS
(Pins 10, 11)
Peak Differential Output4
Output Resistance
Quiescent Output Voltage
Either Pin to COM
Either Pin to COM
± 180
75
–90
± 180
75
–90
mV
mV
POWER SUPPLY
Voltage Supply Range
Quiescent Current
+VS (Pin 12)
–VS (Pin 7)
TMIN to TMAX
TMIN to TMAX
± 4.5
9
35
± 7.5
15
60
± 4.5
9
35
± 7.5
15
60
V
mA
mA
NOTES
1Logarithms to base 10 are used throughout. The response is independent of the sign of VIN.
2The zero-signal current is a function of temperature unless internal temperature compensation (ITC) pin is grounded.
3Attenuation ratio trimmed to calibrate intercept to 10 mV when in use. It has a temperature coefficient of +0.3%/°C.
4The fully limited signal output will appear to be a square wave; its amplitude is proportional to absolute temperature.
Specifications subject to change without notice.
–2– REV. C


Part Number AD641
Description 250 MHz Demodulating Logarithmic Amplifier
Maker Analog Devices
Total Page 16 Pages
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