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GENERAL DESCRIPTION

The AD4684/AD4685 are 16-bit, dual, simultaneous sampling, high

speed, successive approximation register (SAR), analog-to-digital

converters (ADCs) that operate from a 3.0 V to 3.6 V power supply

and feature throughput rates of up to 1 MSPS for the AD4684 and

500 kSPS for the AD4685. The analog input types are single-ended

and are sampled and converted on the falling edge of CS.

The AD4684/AD4685 have an on-chip sequencer and integrated

on-chip oversampling block to improve dynamic range and reduce

noise at lower bandwidths. A buffered internal 2.5 V reference is

included. Alternatively, an external reference up to 3.3 V can be

used. The conversion process and data acquisition use standard

control inputs, allowing interfacing to microprocessors or digital

signal processors (DSPs). The AD4684/AD4685 is compatible with

1.8 V, 2.5 V, and 3.3 V interfaces by using the separate logic supply.

The AD4684/AD4685 are available in a 16-lead, 3 mm × 3 mm lead

frame chip scale package (LFCSP) with operation specified from

?40°C to +125°C.

FEATURES

? 16-bit dual simultaneous sampling SAR ADC

? Single-ended analog inputs

? 4-channel with 2:1 multiplexers

? Channel sequencer mode

? Throughput rate

? 1 MSPS (AD4684)

? 500 kSPS (AD4685)

? SNR (typical)

? 87.5 dB with VREF = 3.3 V external

? 93 dB with OSR_MODE = 1, OSR = 8, RES = 1, VREF = 2.5 V

internal

? On-chip oversampling functions

? INL ±1.5 LSB (typical)

? Resolution boost function

? 2.5 V internal reference at 10 ppm/°C (maximum)

? Alert function

? ?40°C to +125°C temperature range

? 16-lead, 3 mm × 3 mm LFCSP

APPLICATIONS

? Motor control position feedback

? Motor control current sense

? Sonars

? Power quality

? Data acquisition systems

? Erbium doped fiber amplifier (EDFA) applications

? Inphase and quadrature demodulation