16-Bit, 100 kSPS PulSAR

Differential ADC in MSOP

AD7684

Rev. 0

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FEATURES

16-bit resolution with no missing codes

Throughput: 100 kSPS

INL: ±1 LSB typ, ±3 LSB max

Single-supply operation: 2.7 V to 5.5 V

Serial interface SPI-

Power Dissipation : 4 mW @ 5 V, 1.5 mW @ 2.7 V,

150 µW @ 2.7 V/10 kSPS

Standby current: 1 nA

8-lead MSOP package

APPLICATIONS

Battery-powered equipment

Data acquisition

Instrumentation

Medical instruments

Process control

APPLICATION DIAGRAM

AD7684

REF

GND

VDD

+IN

–IN

DCLOCK

CS

3-WIRE SPI

INTERFACE

0.5V TO VDD 2.7V TO 5.5V

0

0

Figure 1.

Table 1. MSOP, QFN (LFCSP)/SOT-23, 16-Bit PulSAR ADCs

Type

100 kSPS

250 kSPS

500 kSPS

True Differential

AD7684

AD7687

AD7688

Pseudo

Differential/Unipolar

AD7683

AD7685

AD7694

AD7686

Unipolar

AD7680

GENERAL DESCRIPTION

The AD7684 is a 16-bit, charge redistribution, successive

that operates from a single power supply, VDD, between 2.7 V

to 5.5 V. It contains a low power, high speed, 16-bit sampling

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

serial, SPI-compatible interface port. The part also contains a

low noise, wide bandwidth, short aperture delay, track-and-hold

circuit. On the CS falling edge, it samples the voltage difference

between +IN and –IN pins. The reference voltage, REF, is

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

power scales linearly with throughput.

The AD7684 is housed in an 8-lead MSOP package, with an

operating temperature specified from −40°C to +85°C.