AD8331 Datasheet

IC型号：
AD8331
PDF描述：
Ultralow Noise VGAs with Preamplifier and Programmable RIN
文件大小：
796.00KB
PDF页数：
33页
芯片厂家：
AD

阅览下载纠错 0

扫码查看芯片数据手册

上传产品规格书

PDF预览

Ultralow Noise VGAs with

Preamplifier and Programmable R

AD8331/AD8332

FEATURES

Ultralow noise preamplifier

Voltage noise = 0.74 nV/鈭欻z

Current noise = 2.5 pA/鈭欻z

3 dB bandwidth: 120 MHz

Low power: 125 mW/channel

Wide gain range with programmable postamp

鈥?.5 dB to +43.5 dB

+7.5 dB to +55.5 dB

Low output-referred noise: 48 nV/鈭欻z 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

VPS1

MID

COM1

+19dB

INH1

LMD1

[(鈥?8 to 0) + 21] dB

鈥?/div>

LNA 1

鈥?/div>

VGA 1

POST

AMP1

3.5dB/15.5dB

VOH1

FUNCTIONAL BLOCK DIAGRAM

LON1 LOP1

VIP1

VIN1

VPSV

VCM1

VCM2

HILO

VOL1

BIAS

MID

)

BIAS AND

INTERPOLATOR

GAIN

INT

GAIN

LMD2

INH2

鈥?/div>

LNA 2

VPS2

CLAMP

03199-B-001

COM2

LON2

LOP2

VIP2

VIN2

APPLICATIONS

Figure 1. AD8332 Shown 28-Lead TSSOP

GAIN

= 1V

0.8V

0.6V

0.4V

0.2V

鈥?0

100k

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庐 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.

GAIN (dB)

10M

FREQUENCY (Hz)

100M

Figure 2. Frequency Response vs. Gain

The VGA鈥檚 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 鈥?0掳C to +85掳. 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.

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.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.326.8703

03199-C-002

VGA 2

鈥?/div>

POST

AMP2

COMM

ENB

RCLMP

VOL2

VOH2

AD8331 PDF文件相关型号

AD8332

AD8331相关型号PDF文件下载

型号

版本

描述

厂商

下载
AD830

英文版

High Speed, Video Difference Amplifier

AD

AD830
AD830

英文版

High Speed, Video Difference Amplifier

AD [ Analog De...

AD830
AD830

英文版

High Supply, Video Difference Amplifier

AD830
AD831

英文版

Low Distortion Mixer

AD

AD831
AD831

英文版

Low Distortion Mixer

AD831
AD834

英文版

500 MHz Four-Quadrant Multiplier

AD

AD834
AD834

英文版

500 MHz Four-Quadrant Multiplier

AD834
AD835

英文版

250 MHz, Voltage Output 4-Quadrant Multiplier

AD

AD835
AD835

英文版

250 MHz Voltage Output 4-Quadrand Multiplier

AD835
AD8300

英文版

+3 Volt, Serial Input Complete 12-Bit DAC

AD

AD8300
AD8300

英文版

+3 Volt, Serial Input Complete 12-Bit DAC

AD [ Analog De...

AD8300
AD8300

英文版

+3 Volt, Serial Input Complete 12-Bit DAC

AD8300
AD8302

英文版

AD8302
AD8302

英文版

LF.2.7 GHz RF/IF Gain and Phase Detector

AD [ Analog De...

AD8302
AD8302

英文版

LF.2.7 GHz RF/IF Gain and Phase Detector

AD

AD8302
AD8303

英文版

+3 V, Dual, Serial Input Complete 12-Bit DAC

AD

AD8303
AD8303

英文版

+ 3V, Dual, Serial Input Complete 12-Bit DAC

AD8303
AD8304

英文版

AD8304
AD8304

英文版

160 dB Range (100 pA -10 mA) Logarithmic Converter

AD

AD8304
AD8305

英文版

100 dB Range (10 nA to 1 mA) Logarithmic Converter

AD

AD8305

AD8331 Datasheet

PDF预览

AD8331 PDF文件相关型号

AD8331相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

AD8331 Datasheet

PDF预览

AD8331 PDF文件相关型号

AD8331相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

建议反馈

PDF纠错X