Datasheet > ADA4945-1

ADA4945-1

更新时间： 2024-11-27 01:04:07

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
44页	1219K
描述
High Speed Offset Drift Fully Differential ADC Driver

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数据手册

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ADA4945-1 数据手册

High Speed, 0.1 µV/˚C Offset Drift,

Fully Differential ADC Driver

ADA4945-1

Data Sheet

FEATURES

FUNCTIONAL BLOCK DIAGRAM

ADA4945-1

Broad power supply range: 3 V to 10 V

Wide input common-mode voltage range: −V_Sto +V_S− 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

–FB 1

+IN 2

–IN 3

DISABLE

–OUT

+OUT

Low harmonic distortion

+FB

OCM

−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

NOTES

1. CONNECT THE EXPOSED PAD TO –V .

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

Figure 1.

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 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.

Rev. 0

Document Feedback

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

Technical Support

www.analog.com

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与ADA4945-1相关器件

型号	品牌	获取价格	描述	数据表
ADA4945-1ACPZ-R2	ADI	获取价格	High Speed Offset Drift Fully Differential ADC Driver
ADA4945-1ACPZ-R7	ADI	获取价格	High Speed Offset Drift Fully Differential ADC Driver
ADA4945-1ACPZ-RL	ADI	获取价格	High Speed Offset Drift Fully Differential ADC Driver
ADA4945-1CP-EBZ	ADI	获取价格	High Speed Offset Drift Fully Differential ADC Driver
ADA4950-1	ADI	获取价格	Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
ADA4950-1_16	ADI	获取价格	Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
ADA4950-1YCP-EBZ	ADI	获取价格	Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
ADA4950-1YCPZ-R2	ADI	获取价格	Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
ADA4950-1YCPZ-R7	ADI	获取价格	Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3
ADA4950-1YCPZ-RL	ADI	获取价格	Low Power, Selectable Gain Differential ADC Driver, G = 1, 2, 3

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