ADA4945-1ACPZ-R2 datasheet(1/44 Pages) AD

номер детали	ADA4945-1ACPZ-R2

подробное описание детали	High Speed Offset Drift Fully Differential ADC Driver

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производитель	AD [Analog Devices]

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High Speed, ±0.1 µV/˚C Offset Drift,

Fully Differential ADC Driver

Data Sheet

ADA4945-1

Rev. 0

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Tel: 781.329.4700

Technical Support

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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: 1.8 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

FUNCTIONAL BLOCK DIAGRAM

DISABLE

–FB

+IN

–IN

+FB

NOTES

1. CONNECT THE EXPOSED PAD TO –VS.

–OUT

+OUT

VOCM

12

11

10

1

3

4

9

2

ADA4945-1

Figure 1.

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 makes 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 1.8 nV/√Hz (full power mode).

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

16-lead LFCSP. The ADA4945-1 is specified to operate from

−40°C to +125°C.

Аналогичный номер детали - ADA4945-1ACPZ-R2

производитель	номер детали	датащи	подробное описание детали
Analog Devices	ADA4945-1ACPZ-R2	1Mb / 57P	High Speed, ±0.1 μV/˚C Offset Drift, Fully Differential ADC Driver Rev. A

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Аналогичное описание - ADA4945-1ACPZ-R2

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