Differential ADC in MSOP/LFCSP

Data Sheet

AD7693

FEATURES

16-bit resolution with no missing codes

Throughput: 500 kSPS

INL/DNL: ±0.25 LSB typ, ±0.5 LSB max (±8 ppm of FSR)

Dynamic range: 96.5 dB

SINAD: 96 dB at 1 kHz

THD: −120 dB at 1 kHz

No pipeline delay

Single-supply 5 V operation with

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

Proprietary serial interface

SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible1

Daisy-chain multiple ADCs, selectable busy indicator

Power dissipation: 40 nJ/conversion

40 µW at 5 V/1 kSPS

4 mW at 5 V/100 kSPS

18 mW at 5 V/500 kSPS

Standby current: 1 nA

10-lead package: MSOP (MSOP-8 size) and

3 mm × 3 mm LFCSP (SOT-23 size)

Pin-for-pin compatible with the 16-bit AD7687 and AD7688

and the 18-bit AD7690 and AD7691

APPLICATIONS

Battery-powered equipment

Data acquisitions

Seismic data acquisition systems

DVMs

Instrumentation

Medical instruments

1.0

–1.0

0

65536

CODE

0.8

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

16384

32768

49152

POSITIVE INL = +0.17LSB

NEGATIVE INL = –0.17LSB

Figure 1. Integral Nonlinearity vs. Code

APPLICATION DIAGRAM

AD7693

REF

GND

VDD

IN+

IN–

VIO

SDI

SCK

SDO

CNV

+1.8V TO VDD

3- OR 4-WIRE

INTERFACE

(SPI, DAISY CHAIN, CS)

+2.5V TO +5V

±10V, ±5V, ...

+5V

ADA4941-1

Figure 2.

Table 1. MSOP, LFCSP/SOT-23

14-/16-/18-Bit PulSAR ADC

Type

100

kSPS

250

kSPS

400 kSPS

to

500 kSPS

ADC

Driver

18-Bit

AD7691

AD7690

ADA4941-1

ADA4841-x

16-Bit True

Differential

AD7684

AD7687

AD7688

AD7693

ADA4941-1

ADA4841-x

16-Bit Pseudo

AD7683

AD7685

AD7686

ADA4841-x

Differential/

Unipolar

AD7680

AD7694

14-Bit

AD7940

AD7942

AD7946

ADA4841-x

GENERAL DESCRIPTION

The AD7693 is a 16-bit, successive approximation analog-to-

digital converter (ADC) that operates from a single power supply,

VDD. It contains a low power, high speed, 16-bit sampling ADC

with no missing codes, an internal conversion clock, and a

applied externally and can be set up to the supply voltage, VDD.

On the CNV rising edge, it samples the voltage difference

between the IN+ and IN− pins. The voltages on these pins

Its power scales linearly with throughput.

Using the SDI input, the SPI-compatible serial interface also

features the ability 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 VIO supply.

The AD7693 is housed in a 10-lead MSOP or a 10-lead LFCSP

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

1

Protected by U.S. Patent 6,703,961.

Rev. B

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