16-Bit, 1 MSPS PulSAR ADC in MSOP/QFN

AD7980

Rev. B

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FEATURES

16-bit resolution with no missing codes

Throughput: 1 MSPS

Low power dissipation: 7.0 mW @ 1 MSPS, 70 μW @ 10 kSPS

INL: ±0.6 LSB typical, ±1.25 LSB maximum

SINAD: 91.25 dB @ 10 kHz

THD: −110 dB @ 10 kHz

Pseudo differential analog input range

Any input range and easy to drive with the ADA4841

No pipeline delay

Single-supply 2.5 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

10-lead MSOP and 10-lead, 3 mm × 3 mm, QFN (LFCSP),

same space as SOT-23

Wide operating temperature range: −40°C to +125°C

APPLICATIONS

Battery-powered equipment

Communications

ATE

Data acquisitions

Medical instruments

APPLICATION DIAGRAM EXAMPLE

AD7980

REF

GND

VDD

IN+

IN–

VIO

SDI

SCK

SDO

CNV

1.8V TO 5V

3- OR 4-WIRE INTERFACE

(SPI, DAISY CHAIN, CS)

2.5V TO 5V

2.5V

0 TO VREF

Figure 1.

GENERAL DESCRIPTION

The AD7980 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 and a versatile serial interface port. 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 independent 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 AD7980 is housed in a 10-lead MSOP or a 10-lead QFN

(LFCSP) with operation specified from −40°C to +125°C.

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

Type

100 kSPS

250 kSPS

400 kSPS to 500 kSPS

1000 kSPS

ADC Driver

18-Bit

AD76911

AD76901

AD79821

ADA4941

ADA4841

16-Bit

AD7680

AD76851

AD76861

AD79801

ADA4941

AD7683

AD76871

AD76881

ADA4841

AD7684

AD7694

AD76931

14-Bit

AD7940

AD79421

AD79461