AD605A AD [Analog Devices], AD605A Datasheet

AD605A

Manufacturer Part Number

AD605A

Description

Dual, Low Noise, Single-Supply Variable Gain Amplifier

Manufacturer

AD [Analog Devices]

Datasheet

1.AD605A.pdf (12 pages)

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Download datasheet (261Kb)

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 that

may result from its use. 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.

GENERAL DESCRIPTION

The AD605 is a low noise, accurate, dual channel, linear-in-dB

variable gain amplifier, which is optimized for any application

requiring high performance, wide bandwidth variable gain con-

trol. Operating from a single 5 V supply, the AD605 provides

differential inputs and unipolar gain control for ease of use.

Added flexibility is achieved with a user-determined gain range

and an external reference input which provides user-determined

gain scaling (dB/V).

The high performance linear-in-dB response of the AD605 is

achieved with the differential input, single supply, exponential

amplifier (DSX-AMP) architecture. Each of the DSX-AMPs

comprise a variable attenuator of 0 dB to –48.4 dB followed by

a high speed fixed gain amplifier. The attenuator is based on a

7-stage R-1.5R ladder network. The attenuation between tap

points is 6.908 dB, and 48.360 dB for the entire ladder network.

The DSX-AMP architecture results in 1.8 nV/√Hz input noise

spectral density and will accept a ± 2.0 V input signal when

VOCM is biased at VP/2.

FEATURES

Two Independent Linear-in-dB Channels

Input Noise at Maximum Gain: 1.8 nV/√Hz, 2.7 pA/√Hz

Bandwidth: 40 MHz (–3 dB)

Differential Input

Absolute Gain Range Programmable:

Variable Gain Scaling: 20 dB/V Through 40 dB/V

Stable Gain with Temperature and Supply Variations

Single-Ended Unipolar Gain Control

Output Common-Mode Independently Set

Power Shutdown at Lower End of Gain Control

Single 5 V Supply

Low Power: 90 mW/Channel

Drives A/D Converters Directly

APPLICATIONS

Ultrasound and Sonar Time-Gain Control

High Performance AGC Systems

Signal Measurement

–14 dB to +34 dB (FBK Shorted to OUT) Through

0 dB to +48 dB (FBK Open)

Each independent channel of the AD605 provides a gain range

of 48 dB which can be optimized for the application. Gain

ranges between –14 dB to +34 dB and 0 dB to +48 dB can be

selected by a single resistor between pins FBK and OUT. The

lower and upper gain ranges are determined by shorting pin

FBK to OUT, or leaving pin FBK unconnected, respectively.

The two channels of the AD605 can be cascaded to provide 96

dB of very accurate gain range in a monolithic package.

The gain control interface provides an input resistance of approxi-

mately 2 MΩ and scale factors from 20 dB/V to 30 dB/V for a

VREF input voltage of 2.5 V to 1.67 V, respectively. Note that

scale factors up to 40 dB/V are achievable with reduced accu-

racy for scales above 30 dB/V. The gain scales linearly in dB

with control voltages (VGN) of 0.4 V to 2.4 V for the 20 dB/V

scale and 0.20 V to 1.20 V for the 40 dB/V scale. When VGN

is <50 mV the amplifier is powered down to draw 1.9 mA.

Under normal operation, the quiescent supply current of each

amplifier channel is only 18 mA.

The AD605 is available in 16-lead PDIP and SOIC, and is

guaranteed for operation over the –40°C to +85°C tempera-

ture range.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

VREF

VGN

Dual, Low Noise, Single-Supply

–IN

+IN

CONTROL

SCALING

GAIN

AND

FUNCTIONAL BLOCK DIAGRAM

Variable Gain Amplifier

DIFFERENTIAL

ATTENUATOR

0 TO –48.4dB

PRECISION PASSIVE

INPUT ATTENUATOR

FIXED GAIN

AMPLIFIER

AD605

+34.4dB

AD605

www.analog.com

OUT

FBK

VOCM

Related parts for AD605A

AD605A Summary of contents

Page 1

FEATURES Two Independent Linear-in-dB Channels Input Noise at Maximum Gain: 1.8 nV/√Hz, 2.7 pA/√Hz Bandwidth: 40 MHz (–3 dB) Differential Input Absolute Gain Range Programmable: – +34 dB (FBK Shorted to OUT) Through +48 ...

Page 2

... Quiescent Supply Current VPOS Power Down VPOS, VGN < Power-Up Response Time 48 dB Gain, V Power-Down Response Time (Each channel @ (Scaling = 20 dB/V), – +34 dB gain range, unless otherwise noted.) AD605A Min Typ 175 ± 40 3.0 2.5 ± 2.5 1.8 2.7 8.4 12 –20 40 170 2.5 ± 1.5 2 ± ...

Page 3

... AD605BN –40°C to +85°C AD605BR –40°C to +85°C AD605BR-REEL –40°C to +85°C AD605BR-REEL7 –40°C to +85°C AD605ACHIPS AD605-EB Pin No. Mnemonic Description 1 VGN1 CH1 Gain-Control Input and Power-Down Pin. If grounded, device is off, otherwise positive voltage increases gain. ...

Page 4

AD605–Typical Performance Characteristics (per Channel 2.5 V (20 dB/V Scaling MHz, R REF 40 –40 C, + –10 –20 0.1 0.5 0.9 1.3 1.7 2.1 2.5 2.9 VGN ...

Page 5

VGN = 2.9V (FBK = OPEN) 40 VGN = 2.9V (FBK = SHORT) VGN = 1.5V (FBK = OPEN) 20 VGN = 1.5V (FBK = SHORT) VGN = 0.1V (FBK = OPEN) 0 VGN = 0.1V (FBK = SHORT) ...

Page 6

AD605 – p-p O –35 VGN = 1.0V –40 –45 –50 HD3 –55 HD2 –60 –65 –70 100k 1M 10M 100M FREQUENCY (Hz) TPC 19. Harmonic Distortion vs. Frequency 15 10 INPUT 5 GENERATOR LIMIT = 21 ...

Page 7

VGN1 = p-p OUT1 – GND IN2 –50 VGN2 = 2.9V –60 VGN2 = 2.5V –70 VGN2 = 2.0V –80 VGN2 = 0.1V –90 100k 1M 10M 100M FREQUENCY (Hz) TPC 28. Crosstalk ...

Page 8

AD605 VREF VGN +IN –IN VPOS VOCM C3 EXT Figure 1. Simplified Block Diagram of a Single Channel of the AD605 THEORY OF OPERATION The AD605 is a dual channel, low noise variable gain amplifier. Figure 1 shows the simplified ...

Page 9

R R –6.908dB –13.82dB +IN 1.5R MID 1. –IN NOTE 1.5R = 144 One feature of the X-AMP architecture is that the output referred noise is constant versus gain over most of the gain range. ...

Page 10

AD605 The AFA makes a differential input structure possible since one of its inputs (G1) is fully differential; this input is made distributed gm stage. The second input (G2) is used for feed- back. The output of ...

Page 11

Two other easy combinations are possible to provide a gain range of – +82.8 dB: (1) make R1 a short and R2 an open; or (2) make R1 an open and R2 a short. The bandwidth for both ...

Page 12

AD605 0.180 (4.57) 0.150 (3.81) 0.130 (3.30) 0.110 (2.79) 4.00 (0.1575) 3.80 (0.1496) 0.25 (0.0098) 0.10 (0.0039) COPLANARITY CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE ...

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