AD603SQ/883B Analog Devices, AD603SQ/883B Datasheet

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AD603SQ/883B

Manufacturer Part Number
AD603SQ/883B
Description
Manufacturer
Analog Devices
Datasheet

Specifications of AD603SQ/883B

Dc
08+

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FEATURES
Linear-in-dB gain control
Pin programmable gain ranges
Any intermediate range, for example −1 dB to +41 dB
Bandwidth independent of variable gain
1.3 nV/√Hz input noise spectral density
±0.5 dB typical gain accuracy
APPLICATIONS
RF/IF AGC amplifier
Video gain control
A/D range extension
Signal measurement
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 decibel gain is linear in dB, accurately calibrated, and stable
over temperature and supply. The gain is controlled at a high
Rev. G
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. Trademarks and
registered trademarks are the property of their respective owners.
−11 dB to +31 dB with 90 MHz bandwidth
9 dB to 51 dB with 9 MHz bandwidth
with 30 MHz bandwidth
COMM
GNEG
VNEG
GPOS
VPOS
VINP
8
6
1
2
3
4
0dB
V
R
REFERENCE
G
–6.02dB –12.04dB –18.06dB –24.08dB –30.1dB –36.12dB –42.14dB
SCALING
2R
INTERFACE
R
CONTROL
GAIN-
2R
R-2R LADDER NETWORK
R
FUNCTIONAL BLOCK DIAGRAM
2R
R
2R
INPUT ATTENUATOR
PRECISION PASSIVE
R
Figure 1.
AD603
2R
R
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 S/N ratio.
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 seven-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 which is linear in dB.
The AD603 is specified for operation from −40°C to +85°C.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2R
R
R
Variable Gain Amplifier
© 2005 Analog Devices, Inc. All rights reserved.
FIXED-GAIN
AMPLIFIER
1
NOMINAL VALUES.
Low Noise, 90 MHz
6.44kΩ
694Ω
20Ω
1
1
1
7
5
V
FDBK
OUT
www.analog.com
AD603

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AD603SQ/883B Summary of contents

Page 1

... Rev. G 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 ...

Page 2

AD603 TABLE OF CONTENTS Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 4 ESD Caution.................................................................................. 4 Pin Configuration and Function Descriptions............................. 5 Typical Performance Characteristics ............................................. 6 Theory of Operation ...................................................................... 11 Noise Performance ..................................................................... 11 The Gain Control Interface....................................................... 12 Programming the ...

Page 3

SPECIFICATIONS @ T = 25° ±5 V, –500 mV ≤ noted. Table 1. Parameter INPUT CHARACTERISTICS Input Resistance Input Capacitance 1 Input Noise Spectral Density Noise Figure 1 dB Compression Point Peak Input Voltage ...

Page 4

AD603 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage ±V S Internal Voltage VINP (Pin 3) GPOS, GNEG (Pins Internal Power Dissipation Operating Temperature Range AD603A AD603S Storage Temperature Range Lead Temperature Range (Soldering 60 sec) 1 ...

Page 5

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS GPOS 1 8 AD603 GNEG 2 7 VINP 3 TOP VIEW 6 (Not to Scale) COMM 4 5 Figure 2. 8-Lead Plastic SOIC (R) Package Table 3. Pin Function Descriptions Pin No. Mnemonic 1 GPOS ...

Page 6

AD603 TYPICAL PERFORMANCE CHARACTERISTICS @ T = 25° ±5 V, –500 mV ≤ noted 10.7MHz 10 100kHz 0 –10 –0.6 –0.4 –0.2 0 0.2 V (V) G Figure 4. Gain vs. ...

Page 7

HP3326A 8 DUAL- 3 CHANNEL 5 SYNTHESIZER AD603 7 100Ω 0.1µF –5V DATEL DVC 8500 Figure 10. Third Order Intermodulation Distortion Test Setup 10dB/DIV Figure 11. Third Order Intermodulation Distortion at 455 kHz (10× Probe Used ...

Page 8

AD603 102 100 100k 1M FREQUENCY (Hz) Figure 16. Input Impedance vs. Frequency (Gain = +30 dB) 1V 100 Figure 17. Gain Control Channel Response Time 4.5V INPUT GND 1V/DIV 500mV OUTPUT GND ...

Page 9

FREQUENCY (Hz) Figure 22. PSRR vs. Frequency (Worst Case is Negative Supply PSRR, Shown Here) 0.1 µ F +5V HP3326A 8 DUAL- 3 CHANNEL 5 SYNTHESIZER AD603 7 100 Ω ...

Page 10

AD603 25° Ω 100 Ω TEST SETUP FIGURE 23 30MHz 16 40MHz 14 12 70MHz 10 8 –40 –30 INPUT LEVEL (dBm) Figure 28. Third Order ...

Page 11

THEORY OF OPERATION The AD603 comprises a fixed-gain amplifier, preceded by a broadband passive attenuator 42.14 dB, having a gain control scaling factor per volt. The fixed gain is laser- trimmed in two ...

Page 12

AD603 VPOS 8 SCALING REFERENCE VNEG 6 GPOS GNEG 2 INTERFACE 0dB –6.02dB –12.04dB –18.06dB –24.08dB –30.1dB –36.12dB –42.14dB VINP COMM 4 THE GAIN CONTROL INTERFACE The attenuation is controlled through a differential, ...

Page 13

VC1 1 GPOS VPOS 8 VPOS AD603 VC2 2 GNEG VOUT 7 VIN 3 VINP VNEG 6 VNEG COMM FDBK 4 5 Figure 31 dB; 30 MHz Bandwidth VC1 GPOS VPOS VPOS 1 8 AD603 VC2 ...

Page 14

AD603 USING THE AD603 IN CASCADE Two or more AD603s can be connected in series to achieve higher gain. Invariably, ac coupling must be used to prevent the dc offset voltage at the output of each amplifier from overloading the ...

Page 15

INPUT 0dB GPOS V = 2.0V C Figure 38. AD603 Gain Control Input Calculations for Sequential Operation V +31.07dB +31.07dB 1 +10dB –11.07dB –8.93dB 0.473 GAIN 0 0.5 1.0 1.50 (dB) –22.14 – GAIN ...

Page 16

AD603 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 –0.2 0 0.2 0.4 0.6 0.8 1.0 1 Figure 42. Gain Error for Cascaded Stages–Sequential Control PARALLEL MODE (SIMPLEST GAIN CONTROL INTERFACE) In this mode, the gain control ...

Page 17

V C Figure 46. ISNR vs. Control Voltage—Low Ripple Mode 1.0 1.2 Rev Page AD603 ...

Page 18

AD603 APPLICATIONS A LOW NOISE AGC AMPLIFIER Figure 47 shows the ease with which the AD603 can be connected as an AGC amplifier. The circuit illustrates many of the points previously discussed: It uses few parts, has linear-in- dB gain, ...

Page 19

During the time V is negative with respect to the base OUT voltage of Q1, Q1 conducts; when V OUT Since the average collector current forced to be 300 µA, and the square wave has a duty ...

Page 20

... AD603ARZ-REEL −40°C to +85°C 1 AD603ARZ-REEL7 −40°C to +85°C AD603AQ −40°C to +85°C 2 AD603SQ/883B −55°C to +125°C AD603-EB AD603ACHIPS Pb-free part. 2 Refer to AD603 Military data sheet. Also available as 5962-9457203MPA. © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners ...

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