AD8331ARQZ-R7 datasheet(1/56 Pages) AD

部件名	AD8331ARQZ-R7

功能描述	Ultralow Noise VGAs with Preamplifier and Programmable RIN

PDF	56 Pages

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制造商	AD [Analog Devices]

网页	http://www.analog.com

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Ultralow Noise VGAs with

Preamplifier and Programmable RIN

AD8331/AD8332/AD8334

Rev. G

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother

rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.

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

Tel: 781.329.4700

www.analog.com

Fax: 781.461.3113

FEATURES

Ultralow noise preamplifier (preamp)

Voltage noise = 0.74 nV/√Hz

Current noise = 2.5 pA/√Hz

3 dB bandwidth

AD8331: 120 MHz

AD8332, AD8334: 100 MHz

Low power

AD8331: 125 mW/channel

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

AD8332 and AD8334 available in lead frame chip scale package

APPLICATIONS

Ultrasound and sonar time-gain controls

High performance automatic gain control (AGC) systems

I/Q signal processing

High speed, dual ADC drivers

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.

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.

FUNCTIONAL BLOCK DIAGRAM

VOL

VOH

VMID

LNA

48dB

ATTENUATOR

ENB

INH

LMD

VIN

VIP

LOP

LON

GAIN

AD8331/AD8332/AD8334

+

–

CLAMP

RCLMP

HILO

VCM

3.5dB OR 15.5dB

19dB

PA

VCM

BIAS

VGA BIAS AND

INTERPOLATOR

GAIN

CONTROL

INTERFACE

21dB

Figure 1. Signal Path Block Diagram

60

50

40

30

20

10

0

–10

100k

1M

10M

100M

1G

FREQUENCY (Hz)

VGAIN = 1V

VGAIN = 0.8V

VGAIN = 0.6V

VGAIN = 0.4V

VGAIN = 0.2V

VGAIN = 0V

HI GAIN

MODE

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.

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.

类似零件编号 - AD8331ARQZ-R7

制造商	部件名	数据表	功能描述
Analog Devices	AD8331ARQZ-R7	867Kb / 40P	Ultralow Noise VGAs with Preamplifier and Programmable RIN 4/06-Rev. D to Rev. E

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制造商	部件名	数据表	功能描述
Analog Devices	AD8331	482Kb / 32P	Ultralow Noise VGAs with Preamplifier and Programmable RIN 11/03-Data Sheet Changed from REV. B to REV. C
	AD8332	606Kb / 28P	Dual VGA with Ultralow Noise Preamplifier and Programmable RIN
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	AD8331	1Mb / 56P	Ultralow Noise VGAs with Preamplifier and Programmable R Rev. G
	AD8332	1Mb / 56P	Ultralow Noise VGAs with Preamplifier and Programmable R Rev. G
	AD8334	1Mb / 56P	Ultralow Noise VGAs with Preamplifier and Programmable R Rev. G
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	ADRF6520	1Mb / 29P	Dual Programmable Filters and VGAs 4/2017-Revision 0
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