Datasheet > AD8334_15

AD8334_15

更新时间： 2024-11-22 01:14:15

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
56页	1825K
描述
Ultralow Noise VGAs with Preamplifier and Programmable R

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AD8334_15 数据手册

Ultralow Noise VGAs with

Preamplifier and Programmable R_IN

AD8331/AD8332/AD8334

FEATURES

FUNCTIONAL BLOCK DIAGRAM

LON LOP VIP VIN

VCM

HILO

Ultralow noise preamplifier (preamp)

Voltage noise = 0.74 nV/√Hz

Current noise = 2.5 pA/√Hz

3 dB bandwidth

AD8331: 120 MHz

3.5dB OR 15.5dB

MID

LNA

19dB

–

ATTENUATOR

VOH

VOL

48dB

21dB

INH

AD8332, AD8334: 100 MHz

Low power

AD8331: 125 mW/channel

CLAMP

LMD

GAIN

VCM

BIAS

VGA BIAS AND

INTERPOLATOR

RCLMP

CONTROL

INTERFACE

AD8332, AD8334: 145 mW/channel

Wide gain range with programmable postamp

−4.5 dB to +43.5 dB in LO gain mode

7.5 dB to 55.5 dB in HI gain mode

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

Active input impedance matching

Optimized for 10-bit/12-bit ADCs

Selectable output clamping level

Single 5 V supply operation

AD8331/AD8332/AD8334

ENB

GAIN

Figure 1. Signal Path Block Diagram

= 1V

GAIN

HI GAIN

MODE

= 0.8V

= 0.6V

= 0.4V

GAIN

AD8332 and AD8334 available in lead frame chip scale package

APPLICATIONS

= 0.2V

= 0V

Ultrasound and sonar time-gain controls

High performance automatic gain control (AGC) systems

I/Q signal processing

GAIN

High speed, dual ADC drivers

–10

100k

10M

FREQUENCY (Hz)

100M

GENERAL DESCRIPTION

The AD8331/AD8332/AD8334 are single-, dual-, and quad-

channel, ultralow noise linear-in-dB, variable gain amplifiers

(VGAs). Optimized for ultrasound systems, they are usable as a

low noise variable gain element at frequencies up to 120 MHz.

Figure 2. Frequency Response vs. Gain

Differential signal paths result in superb second- and third-

order distortion performance and low crosstalk.

The low output-referred noise of the VGA is advantageous in

driving high speed differential ADCs. The gain of the postamp

can 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 can be limited to a user-selected clamping level, preventing

input overload to a subsequent ADC. An external resistor adjusts

the clamping level.

Included in each channel are an ultralow noise preamp (LNA),

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

postamp with adjustable output limiting. The LNA gain is 19 dB

with a single-ended input and differential outputs. Using a single

resistor, the LNA input impedance can be adjusted to match a

signal source without compromising noise performance.

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.

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

AD8331 is available in a 20-lead QSOP package, the AD8332 is

available in 28-lead TSSOP and 32-lead LFCSP packages, and

the AD8334 is available in a 64-lead LFCSP package.

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700

www.analog.com

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