AD8331-EVAL

更新时间： 2024-11-24 22:50:03

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
32页	482K
描述
Ultralow Noise VGAs with Preamplifier and Programmable RIN

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AD8331-EVAL 数据手册

Ultralow Noise VGAs with

Preamplifier and Programmable R_IN

AD8331/AD8332

FUNCTIONAL BLOCK DIAGRAM

FEATURES

LON1 LOP1

25 24

VIP1 VIN1

22 21

VPSV

VCM1

VCM2

HILO

Ultralow noise preamplifier

VPS1

Voltage noise = 0.74 nV/√Hz

Current noise = 2.5 pA/√Hz

MID

COM1

3.5dB/15.5dB

[(–48 to 0) + 21] dB

+19dB

3 dB bandwidth: 120 MHz

17 VOH1

16 VOL1

–

INH1 27

POST

AMP1

VGA 1

Low power: 125 mW/channel

Wide gain range with programmable postamp

–4.5 dB to +43.5 dB

LNA 1

–

LMD1

BIAS

BIAS AND

INTERPOLATOR

GAIN

INT

10 GAIN

13 VOL2

)

MID

+7.5 dB to +55.5 dB

–

LMD2

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

POST

AMP2

VGA 2

–

LNA 2

INH2

VOH2

VPS2

CLAMP

COM2

LON2 LOP2

VIP2 VIN2

COMM

ENB

RCLMP

Available in space-saving chip scale package

Figure 1. AD8332 Shown 28-Lead TSSOP

APPLICATIONS

= 1V

GAIN

Ultrasound and sonar time-gain control

High performance AGC systems

I/Q signal processing

0.8V

0.6V

High speed dual ADC driver

0.4V

0.2V

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.

–10

–20

100k

10M

FREQUENCY (Hz)

100M

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.

Figure 2. Frequency Response vs. Gain

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 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.

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.

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

Fax: 781.326.8703

www.analog.com

12 3 4 5 6 7...32

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与AD8331-EVAL相关器件

型号	品牌	获取价格	描述	数据表
AD8331-EVALZ	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN
AD8331TRQZ-EP	ADI	获取价格	Single VGA with Ultralow Noise Preamplifier and Programmable RIN
AD8331TRQZ-EP-R7	ADI	获取价格	Single VGA with Ultralow Noise Preamplifier and Programmable RIN
AD8332	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN
AD8332_15	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable R
AD8332ACP-R2	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN
AD8332ACP-REEL	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN
AD8332ACP-REEL7	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN
AD8332ACPZ-R2	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN
AD8332ACPZ-R7	ADI	获取价格	Ultralow Noise VGAs with Preamplifier and Programmable RIN

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