18-bit, 1 MSPS PulSAR™ ADC in MSOP/QFN

Preliminary Technical Data

AD7982

Rev PrC

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18-bit resolution with no missing codes

Throughput: 1MSPS

Low Power dissipation: 7.5 mW @ 1MSPS, 75 μW @ 10kSPS

INL: ±1 LSB typ, ±2.5 LSB max

Dynamic range: 99 dB

Any input range and easy to drive with the ADA4941

No pipeline delay

Single-supply 2.5V 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

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

QFN (LFCSP), 3 mm × 3 mm same space as SOT-23

APPLICATIONS

Battery-powered equipment

Data acquisitions

Instrumentation

Medical instruments

Seismic Data Acquisition Systems

Table 1. MSOP, QFN(LFCSP)/SOT-23 14, 16 and18-Bit ADC

Type

100

kSPS

250

kSPS

400-

500

kSPS

1000

kSPS

ADC

Driver

18Bit

ADA4941

ADA4841

16Bit

AD7680

AD7683

AD7684

AD7694

ADA4941

ADA4841

14Bit

AD7940

APPLICATION DIAGRAM EXAMPLE

AD7982

REF

GND

VDD

IN+

IN–

VIO

SDI

SCK

SDO

CNV

1.8 TO 5V

3- OR 4-WIRE

INTERFACE

(SPI, , CS

DAISY CHAIN)

2.5 TO 5V 2.5V

ADA4941

±10V, ±5V, ..

Figure 1.

GENERAL DESCRIPTION

The AD7982 is a 18-bit, successive approximation, analog-to-

digital converter (ADC) that operates from a single power

supply, VDD. It contains a low power, high speed, 18-bit

sampling ADC and a versatile serial interface port. 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 independently of the supply

voltage, VDD.

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 AD7982 is housed in a 10-lead MSOP or a 10-lead QFN

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