AD8331 Analog Devices, AD8331 Datasheet

AD8331

Manufacturer Part Number

AD8331

Description

Ultralow Noise VGAs with Preamplifier and Programmable RIN

Manufacturer

Analog Devices

Datasheet

1.AD8331.pdf (32 pages)

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Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

AD8331ARQZ

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ADI/亚德诺

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FEATURES

Ultralow noise preamplifier

3 dB bandwidth: 120 MHz

Low power: 125 mW/channel

Wide gain range with programmable postamp

Low output-referred noise: 48 nV/√Hz typical

Active input impedance matching

Optimized for 10-/12-bit ADCs

Selectable output clamping level

Single 5 V supply operation

Available in space-saving chip scale package

APPLICATIONS

Ultrasound and sonar time-gain control

High performance AGC systems

I/Q signal processing

High speed dual ADC driver

GENERAL DESCRIPTION

The AD8331/AD8332 are single- and dual-channel ultralow

noise, linear-in-dB, variable gain amplifiers. Although optimized

for ultrasound systems, they are usable as low noise variable

gain elements at frequencies up to 120 MHz.

Each channel consists of an ultralow noise preamplifier (LNA),

an X-AMP® VGA with 48 dB of gain range, and a selectable gain

postamplifier with adjustable output limiting. The LNA gain is

19 dB with a single-ended input and differential outputs capable

of accurate, programmable active input impedance matching by

selecting an external feedback resistor. Active impedance

control optimizes noise performance for applications that

benefit from input matching.

The 48 dB gain range of the VGA makes these devices suitable

for a variety of applications. Excellent bandwidth uniformity is

maintained across the entire range. The gain control interface

provides precise linear-in-dB scaling of 50 dB/V for control

voltages between 40 mV and 1 V. Factory trim ensures excellent

part-to-part and channel-to-channel gain matching. Differential

signal paths lead to superb second and third order distortion

performance and low crosstalk.

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.

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.

Voltage noise = 0.74 nV/√Hz

Current noise = 2.5 pA/√Hz

–4.5 dB to +43.5 dB

+7.5 dB to +55.5 dB

Preamplifier and Programmable R

The VGA’s low output-referred noise is advantageous in driving

high speed differential ADCs. The gain of the postamplifier may

be pin selected to 3.5 dB or 15.5 dB to optimize gain range and

output noise for 12-bit or 10-bit converter applications. The

output may be limited to a user-selected clamping level,

preventing input overload to a subsequent ADC. An external

resistor adjusts the clamping level.

The operating temperature range is –40°C to +85°. The

AD8331 is available in a 20-lead QSOP package, and the

AD8332 in 28-lead TSSOP and 32-lead LFCSP packages. They

require a single 5 V supply, and the quiescent power

consumption is 125 mW/ch. A power-down (enable) pin is

provided.

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

Tel: 781.329.4700

Fax: 781.326.8703

COM1

COM2

LMD1

LMD2

VPS1

VPS2

INH1

INH2

+19dB

–10

–20

100k

–

LNA 1

LNA 2

FUNCTIONAL BLOCK DIAGRAM

LON1

LON2

Ultralow Noise VGAs with

BIAS

MID

Figure 1. AD8332 Shown 28-Lead TSSOP

LOP1

)

LOP2

Figure 2. Frequency Response vs. Gain

VIP1

VIP2

GAIN

VIN1

VIN2

0.8V

0.6V

0.4V

0.2V

[(–48 to 0) + 21] dB

FREQUENCY (Hz)

= 1V

–

COMM

INTERPOLATOR

BIAS AND

AD8331/AD8332

VPSV

VGA 1

VGA 2

10M

ENB

VCM1

MID

VCM2

100M

CLAMP

RCLMP

AMP1

AMP2

3.5dB/15.5dB

POST

GAIN

www.analog.com

INT

HILO

VOH1

VOL1

GAIN

VOL2

VOH2

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