ad7688brm Analog Devices, Inc., ad7688brm Datasheet

ad7688brm

Manufacturer Part Number

ad7688brm

Description

16-bit, 1.5 Lsb Inl, 500 Ksps Pulsar? Differential Adc In Msop/qfn

Manufacturer

Analog Devices, Inc.

Datasheet

1.AD7688BRM.pdf (28 pages)

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FEATURES

16-bit resolution with no missing codes

Throughput: 500 kSPS

INL: ±0.4 LSB typ, ±1.5 LSB max (±23 ppm of FSR)

Dynamic range: 96.5 dB

SNR: 95.5 dB @ 20 kHz

THD: −118 dB @ 20 kHz

True differential analog input range

No pipeline delay

Single-supply 5 V operation with

Serial interface SPI®/QSPI™/MICROWIRE™/DSP-compatible

Daisy-chain multiple ADCs and BUSY indicator

Power dissipation

Standby current: 1 nA

10-lead MSOP (MSOP-8 size) and

Pin-for-pin compatible with AD7685, AD7686, and AD7687

APPLICATIONS

Battery-powered equipment

Data acquisitions

Instrumentation

Medical instruments

Process controls

Rev. 0

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.

±V

0 V to V

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

3.75 mW @ 5 V/100 kSPS

3.75 µW @ 5 V/100 SPS

3 mm × 3 mm QFN

REF

–0.5

–1.0

–1.5

1.5

1.0

0.5

REF

with V

Figure 1. Integral Nonlinearity vs. Code

REF

16384

up to VDD on both inputs

(LFCSP) (SOT-23 size)

32768

CODE

POSITIVE INL = +0.31LSB

NEGATIVE INL = –0.39LSB

49152

65535

16-Bit, 1.5 LSB INL, 500 kSPS PulSAR™

Table 1. MSOP, QFN

Type

True Differential

Pseudo

Differential/Unipolar

Unipolar

GENERAL DESCRIPTION

The AD7688 is a 16-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, 16-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 the voltage difference between IN+ and IN− pins.

The voltages on these pins usually swing in opposite phase

between 0 V and REF. The reference voltage, REF, is applied

externally and can be set up to the supply voltage.

Its power scales linearly with throughput.

The SPI-compatible serial interface also features the ability,

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

3-wire bus and 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 AD7688 is housed in a 10-lead MSOP or a 10-lead QFN

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

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

Tel: 781.329.4700

Fax: 781.461.3113

VREF

QFN package in development. Contact sales for samples and availability.

Differential ADC in MSOP/QFN

APPLICATION DIAGRAM

0.5V TO 5V

IN+

IN–

(LFCSP)/SOT-23 16-Bit PulSAR ADC

AD7688

GND

REF

100 kSPS

AD7684

AD7683

AD7680

VDD

Figure 2.

SDO

SCK

CNV

VIO

SDI

250 kSPS

AD7687

AD7685

AD7694

1.8V TO VDD

3- OR 4-WIRE INTERFACE

(SPI, DAISY CHAIN, CS)

www.analog.com

AD7688

500 kSPS

AD7688

AD7686

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