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PDF AD603 Data sheet ( Hoja de datos )
| Número de pieza | AD603 | |
| Descripción | Variable Gain Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
Low Noise, 90 MHz
Variable Gain Amplifier
AD603
FEATURES
Linear-in-dB gain control
Pin-programmable gain ranges
−11 dB to +31 dB with 90 MHz bandwidth
9 dB to 51 dB with 9 MHz bandwidth
Any intermediate range, for example −1 dB to +41 dB
with 30 MHz bandwidth
Bandwidth independent of variable gain
1.3 nV/√Hz input noise spectral density
±0.5 dB typical gain accuracy
The decibel gain is linear in dB, accurately calibrated, and stable
over temperature and supply. The gain is controlled at a high
impedance (50 MΩ), low bias (200 nA) differential input; the
scaling is 25 mV/dB, requiring a gain control voltage of only
1 V to span the central 40 dB of the gain range. An overrange
and underrange of 1 dB is provided whatever the selected range.
The gain control response time is less than 1 μs for a 40 dB change.
The differential gain control interface allows the use of either
differential or single-ended positive or negative control voltages.
Several of these amplifiers may be cascaded and their gain
control gains offset to optimize the system SNR.
APPLICATIONS
RF/IF AGC amplifiers
Video gain controls
A/D range extensions
Signal measurements
GENERAL DESCRIPTION
The AD603 is a low noise, voltage-controlled amplifier for use
in RF and IF AGC systems. It provides accurate, pin-selectable
gains of −11 dB to +31 dB with a bandwidth of 90 MHz or +9 dB to
51+ dB with a bandwidth of 9 MHz. Any intermediate gain
range may be arranged using one external resistor. The input
referred noise spectral density is only 1.3 nV/√Hz, and power
consumption is 125 mW at the recommended ±5 V supplies.
The AD603 can drive a load impedance as low as 100 Ω with
low distortion. For a 500 Ω load in shunt with 5 pF, the total
harmonic distortion for a ±1 V sinusoidal output at 10 MHz is
typically −60 dBc. The peak specified output is ±2.5 V minimum
into a 500 Ω load.
The AD603 uses a patented proprietary circuit topology—the
X-AMP®. The X-AMP comprises a variable attenuator of 0 dB
to −42.14 dB followed by a fixed-gain amplifier. Because of the
attenuator, the amplifier never has to cope with large inputs and
can use negative feedback to define its (fixed) gain and dynamic
performance. The attenuator has an input resistance of 100 Ω,
laser trimmed to ±3%, and comprises a 7-stage R-2R ladder
network, resulting in an attenuation between tap points of
6.021 dB. A proprietary interpolation technique provides a
continuous gain control function that is linear in dB.
The AD603 is specified for operation from −40°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
SCALING
REFERENCE
PRECISION PASSIVE
INPUT ATTENUATOR
FIXED-GAIN
AMPLIFIER
GPOS
GNEG
VG
GAIN-
CONTROL
INTERFACE
AD603
VINP
0dB –6.02dB –12.04dB –18.06dB –24.08dB –30.1dB –36.12dB –42.14dB
RR
2R
R
2R
R
2R
R
2R
R
2R
R
2R
R
COMM
R-2R LADDER NETWORK
*NOMINAL VALUES.
Figure 1.
VOUT
6.44kΩ*
694Ω*
FDBK
20Ω*
Rev. K
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 that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©1993–2012 Analog Devices, Inc. All rights reserved.
1 page  
AD603
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage ±VS
Internal Voltage VINP (Pin 3)
GPOS, GNEG (Pin 1 and Pin2)
Internal Power Dissipation
Operating Temperature Range
AD603A
AD603S
Storage Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
±7.5 V
±2 V Continuous
±VS for 10 ms
±VS
400 mW
−40°C to +85°C
−55°C to +125°C
−65°C to +150°C
300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Data Sheet
Table 3. Thermal Characteristics
Package Type
8-Lead SOIC
θJA
155
8-Lead CERDIP
140
ESD CAUTION
θJC
33
15
Unit
°C/W
°C/W
Rev. K | Page 4 of 24
5 Page 
AD603
20
TA = 25°C
RS = 50Ω
18
RIN = 50Ω
RL = 100Ω
30MHz
TEST SETUP FIGURE 23
16
40MHz
14
12
70MHz
10
8
–40 –30 –20
INPUT LEVEL (dBm)
Figure 28. Third-Order Intercept −10 dB/+30 dB Mode, Gain = 30 dB
Data Sheet
Rev. K | Page 10 of 24
11 Page | ||
| Páginas | Total 25 Páginas | |
| PDF Descargar | [ Datasheet AD603.PDF ] | |
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