Data Sheet

AD7694

Rev. B

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FEATURES

16-bit resolution with no missing codes

Throughput: 250 kSPS at 5 V

INL: ±4 LSB max

S/(N + D): 92 dB at 20 kHz

THD: –106 dB at 20 kHz

Pseudo-differential analog input range:

No pipeline delay

Single-supply operation: 2.7 V or 5 V

Proprietary serial interface

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

Supply Current: 540 μA at 2.7 V/100 kSPS,

800 μA at 5 V/100 kSPS

Standby current: 1 nA

8-lead MSOP package

Improved second source to LTC1864 and LTC1864L

APPLICATIONS

Battery-powered equipment

Data acquisition

Instrumentation

Medical instruments

Process control

GENERAL DESCRIPTION

The AD7694 is a 16-bit, charge redistribution, successive

approximation, PulSAR analog-to-digital converter (ADC) that

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

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

ADC with no missing codes (B grade), 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 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 up to the supply voltage.

Its power scales linearly with throughput.

The AD7694 is housed in an 8-lead MSOP package with an

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

APPLICATION DIAGRAM

AD7694

REF

GND

VDD

IN+

IN–

SCK

SDO

CNV

3-WIRE SPI

INTERFACE

1V TO VDD

2.5V TO 5V

Figure 1.

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

Type

100 kSPS

250 kSPS

500 kSPS

True Differential

AD7684

AD7687

AD7688

Pseudo

AD7683

AD7685

AD7686

Differential/Unipolar

AD7694

Unipolar

AD7680