Datasheet > AD76851

AD76851

更新时间： 2024-10-28 12:34:19

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
24页	644K
描述
14-Bit, 500 kSPS PulSAR ADC in MSOP

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AD76851 数据手册

14-Bit, 500 kSPS

PulSAR ADC in MSOP

AD7946

APPLICATION DIAGRAM

FEATURES

0.5V TO 5V

14-bit resolution with no missing codes

Throughput: 500 kSPS

INL: 0.4 LSB typical, 1 LSB maximum ( 0.0061% of FSR)

SINAD: 85 dB @ 20 kHz

THD: −100 dB @ 20 kHz

Pseudo differential analog input range

0 V to REF with REF up to VDD

VIO

SDI

1.8V TO VDD

REF VDD

0V TO REF

IN+

IN–

SCK

SDO

CNV

AD7946

3- OR 4-WIRE INTERFACE

(SPI, DAISY CHAIN, CS)

GND

No pipeline delay

Single-supply 5 V operation with

1.8 V/2.5 V/3 V/5 V logic interface

Serial interface, SPI/QSPI/MICROWIRE™/DSP compatible

Daisy-chain multiple ADCs and BUSY indicator

Power dissipation

3.3 mW @ 5 V/100 kSPS

3.3 μW @ 5 V/100 SPS

Standby current: 1 nA

Figure 1.

GENERAL DESCRIPTION

The AD7946 is a 14-bit, charge redistribution, successive

approximation, analog-to-digital converter (ADC) that operates

from a single 5 V power supply, VDD. It contains a low power,

high speed, 14-bit sampling ADC with no missing codes, an

internal conversion clock, and a versatile serial interface port.

The part also contains a low noise, wide bandwidth, short

aperture delay track-and-hold circuit. On the CNV rising edge,

it samples an analog input IN+ between 0 V to REF with respect

to a ground sense IN−. The reference voltage, REF, is applied

externally and can be set up to the supply voltage.

10-lead MSOP (MSOP-8 size) and

3 mm × 3 mm QFN (LFCSP) (SOT-23 size)

Pin-for-pin compatible with the 16-bit AD7686

APPLICATIONS

Battery-powered equipment

Data acquisition

Its power scales linearly with throughput.

Instrumentation

Medical instruments

Process control

The SPI-compatible serial interface also features the ability,

using the SDI input, to daisy-chain several ADCs on a single,

3-wire bus, or it provides an optional BUSY indicator. It is

compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate

supply VIO.

The AD7946 is housed in a 10-lead MSOP or a 10-lead QFN

(LFCSP) with operation specified from −40°C to +85°C.

Table 1. MSOP, QFN (LFCSP) 14-/16-/18-Bit PulSAR® ADC

Type

14-Bit

16-Bit

100 kSPS

AD7940

AD7680

AD7683

AD7684

250 kSPS

AD7942¹

AD7685¹

AD7687¹

AD7694

400 kSPS to 500 kSPS

AD7946¹

≥1000 kSPS

ADC Driver

AD7686¹

AD7980¹

AD7983¹

ADA4941

ADA4841

AD7688¹

AD7693¹

18-Bit

AD7691¹

AD7690¹

AD7982¹

AD7984¹

ADA4941

ADA4841

¹Pin-for-pin compatible.

Rev. A

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 registeredtrademarks arethe property of their respective owners.

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

Tel: 781.329.4700 www.analog.com

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