ADA4945-1ACPZ-R7 datasheet(1/57 Pages) AD

номер детали	ADA4945-1ACPZ-R7

подробное описание детали	High Speed, ±0.1 μV/˚C Offset Drift, Fully Differential ADC Driver

PDF	57 Pages

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производитель	AD [Analog Devices]

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Data Sheet

ADA4945-1

High Speed, ±0.1 µV/˚C Offset Drift, Fully Differential ADC Driver

Rev. A

DOCUMENT FEEDBACK

TECHNICAL SUPPORT

One Analog Wa y, Wilmington, MA 01887 -2356, U.S.A.

Tel: 781.329.47 00

FEATURES



Broad power supply range: 3 V to 10 V



Wide input common-mode voltage range:

−VS to +VS − 1.3 V



Rail-to-rail output



Fully specified dual power mode operation



4 mA full power mode (145 MHz)



1.4 mA low power mode (80 MHz)



Full power mode



Low harmonic distortion



−133 dBc HD2 and −140 dBc HD3 at 1 kHz



−133 dBc HD2 and −116 dBc HD3 at 100 kHz



Fast settling time



18-bit: 100 ns



16-bit: 50 ns



Input voltage noise: 2.0 nV/√Hz, f = 100 kHz



±115 μV maximum offset voltage from

−40°C to +125°C



Adjustable output clamps for ADC input protection

APPLICATIONS



Low power Σ-Δ, PulSAR®, and SAR ADC drivers



Single-ended to differential converters



Differential buffers



Medical imaging



Process control



Portable electronics

GENERAL DESCRIPTION

The ADA4945-1 is a low-noise, low-distortion, fully

differential amplifier with two selectable power modes.

The device operates over a broad power supply range

of 3 V to 10 V. The low DC offset, DC offset drift, and

excellent dynamic performance of the ADA4945-1 make

it well suited for a variety of data acquisition and signal

processing applications. The device is an ideal choice

for driving high-resolution, high-performance

successive approximation register (SAR) and Σ-Δ

analog-to-digital converters (ADCs) on 4 mA of

quiescent current (full power mode). The device can

also be selected to operate on 1.4 mA of quiescent

current (low power mode) to scale the power

consumption to the desired performance necessary for

an ADC drive application. The adjustable common-

mode voltage allows the ADA4945-1 to match the input

common-mode voltage of multiple ADCs. The internal

common-mode feedback loop provides exceptional

output balance, as well as suppression of even order

harmonic distortion products.

With the ADA4945-1, differential gain configurations are

achieved with a simple external feedback network of

four resistors determining the closed-loop gain of the

amplifier. The ADA4945-1 is fabricated using Analog

Devices, Inc., proprietary, silicon germanium (SiGe),

complementary bipolar process, enabling the device to

achieve low levels of distortion with an input voltage

noise of only 2.0 nV/√Hz (full power mode).

The ADA4945-1 is available in a RoHS-compliant, 3 mm

× 3 mm, 16-lead LFCSP package. It is specified to

operate from −40°C to +125°C.

Аналогичный номер детали - ADA4945-1ACPZ-R7

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Analog Devices	ADA4945-1ACPZ-R7	1Mb / 44P	High Speed Offset Drift Fully Differential ADC Driver 4/2019-Revision 0

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Аналогичное описание - ADA4945-1ACPZ-R7

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