AD603ARZ Analog Devices Inc, AD603ARZ Datasheet

IC AMP VGA 90MHZ LN 50MA 8SOIC

AD603ARZ

Manufacturer Part Number
AD603ARZ
Description
IC AMP VGA 90MHZ LN 50MA 8SOIC
Manufacturer
Analog Devices Inc
Series
X-AMP®r
Type
Var Gain Ampr
Datasheets

Specifications of AD603ARZ

Amplifier Type
Variable Gain
Number Of Circuits
1
Slew Rate
275 V/µs
-3db Bandwidth
90MHz
Current - Input Bias
200nA
Current - Supply
12.5mA
Current - Output / Channel
50mA
Voltage - Supply, Single/dual (±)
9.5 V ~ 12.6 V, ±4.75 V ~ 6.3 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
No. Of Amplifiers
1
Bandwidth
90MHz
Gain Accuracy
1.5dB
No. Of Channels
1
Supply Voltage Range
± 4.75V To ± 6.3V
Amplifier Case Style
SOIC
No. Of Pins
8
Number Of Channels
1
Number Of Elements
2
Power Supply Requirement
Dual
Voltage Gain Db
31.3dB
Input Resistance
0.000103@±5VMohm
Input Bias Current
0.2@±5VnA
Single Supply Voltage (typ)
Not RequiredV
Dual Supply Voltage (typ)
±5V
Power Dissipation
400mW
Rail/rail I/o Type
No
Single Supply Voltage (min)
Not RequiredV
Single Supply Voltage (max)
Not RequiredV
Dual Supply Voltage (min)
±4.75V
Dual Supply Voltage (max)
±6.3V
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC N
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
AD603-EVALZ - BOARD EVALUATION FOR AD603
Output Type
-
Gain Bandwidth Product
-
Voltage - Input Offset
-
Lead Free Status / Rohs Status
Compliant

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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 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.
Rev. I
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
*NOMINAL VALUES.
COMM
GNEG
VNEG
GPOS
VPOS
VINP
8
6
1
2
3
4
0dB
V
R
REFERENCE
G
–6.02dB
SCALING
2R
INTERFACE
R
CONTROL
–12.04dB –18.06dB –24.08dB
GAIN-
2R
R-2R LADDER NETWORK
R
FUNCTIONAL BLOCK DIAGRAM
2R
R
2R
PRECISION PASSIVE
INPUT ATTENUATOR
R
–30.1dB
Figure 1.
AD603
2R
R
–36.12dB –42.14dB
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
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.
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.
2R
R
R
Variable Gain Amplifier
FIXED-GAIN
AMPLIFIER
©2010 Analog Devices, Inc. All rights reserved.
Low Noise, 90 MHz
6.44kΩ*
694Ω*
20Ω*
7
5
VOUT
FDBK
www.analog.com
AD603

Related parts for AD603ARZ

AD603ARZ Summary of contents

Page 1

FEATURES Linear-in-dB gain control Pin-programmable gain ranges − +31 dB with 90 MHz bandwidth with 9 MHz bandwidth Any intermediate range, for example − +41 dB with 30 MHz bandwidth Bandwidth ...

Page 2

AD603 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 4 ESD Caution .................................................................................. 4 Pin Configurations and Function Descriptions ...

Page 3

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

Page 4

AD603 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Supply Voltage ±V S 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) Stresses above ...

Page 5

PIN CONFIGURATIONS 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 SOIC Pin Configuration Table 4. Pin Function Descriptions Pin No. Mnemonic 1 GPOS 2 ...

Page 6

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

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 to HP3585A ...

Page 8

AD603 102 100 100k 1M 10M 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 ...

Page 9

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

Page 10

AD603 TEST SETUP FIGURE 23 30MHz 16 40MHz 14 12 70MHz 10 8 –40 –30 INPUT LEVEL (dBm) Figure 28. Third-Order Intercept −10 dB/+30 dB Mode, Gain = 30 dB ...

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 0dB –6.02dB VINP COMM 4 *NOMINAL VALUES. THE GAIN CONTROL INTERFACE The attenuation is controlled through a differential, high impedance (50 MΩ) input, with ...

Page 13

VC1 GPOS VPOS VPOS 1 8 AD603 VC2 2 GNEG VOUT 7 VIN VINP VNEG VNEG COMM FDBK 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

The gains are offset (Figure 39) such that the gain increased only after the gain of A1 has reached its maximum value. Note that for a differential input of –600 mV or less, the gain of a ...

Page 16

AD603 PARALLEL MODE (SIMPLEST GAIN CONTROL INTERFACE) In this mode, the gain control of voltage is applied to both inputs in parallel: the GPOS pins of both A1 and A2 are connected to the control voltage and the GNEW inputs ...

Page 17

APPLICATIONS INFORMATION 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 18

AD603 During the time V is negative with respect to the base OUT voltage of Q1, Q1 conducts; when V OUT Because the average collector current forced to be 300 μA, and the square wave has a ...

Page 19

EVALUATION BOARD The evaluation board of the AD603 enables simple bench-top experimenting to be performed with easy control of the AD603. Built-in flexibility allows convenient configuration to accommodate most operating configurations. Figure photograph of the AD603 evaluation ...

Page 20

... AD603 Figure 52. Inner Layer Ground Plane Figure 53. Inner Layer Power Plane GPOS GNEG VIN C5 G2 EVALUATION BOARD Figure 54. Component Side Silk Screen Rev Page V– GND DUT W1 VOUT Pb RoHS G3 AD603ARZ ...

Page 21

... AD603AR-REEL −40°C to +85°C AD603AR-REEL7 −40°C to +85°C AD603ARZ −40°C to +85°C AD603ARZ-REEL −40°C to +85°C AD603ARZ-REEL7 −40°C to +85°C AD603AQ −40°C to +85°C 2 AD603SQ/883B −55°C to +125°C AD603-EVALZ AD603ACHIPS RoHS Compliant Part ...

Page 22

AD603 NOTES Rev Page ...

Page 23

NOTES Rev Page AD603 ...

Page 24

AD603 NOTES ©2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00539-0- /10(I) Rev Page ...

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