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GENERAL DESCRIPTION

The AD4630-16 is a two-channel, simultaneous sampling, Easy

Drive?, 2 MSPS successive approximation register (SAR) analogto-

digital converter (ADC). With a guaranteed maximum ±3 ppm

integral nonlinearity (INL) and no missing codes at 16-bits, the

AD4630-16 achieves excellent precision from ?40°C to +125°C.

Figure 1 shows the functional architecture of the AD4630-16.

A low-drift, internal precision reference buffer eases voltage reference

sharing with other system circuitry. The AD4630-16 offers a

typical dynamic range of 97.4 dB when using a 5 V reference.

The low noise floor enables signal chains requiring less gain and

lower power. A block averaging filter with programmable decimation

ratio is available and can reduce noise for low bandwidth signals,

improving accuracy. The wide differential input and common-mode

ranges allow inputs to use the full (±VREF range without saturating,

simplifying signal conditioning requirements and system calibration.

The improved settling of the Easy Drive analog inputs broadens

the selection of analog front-end components compatible with the

AD4630-16. Both single-ended and differential signals are supported.

The versatile Flexi-SPI serial peripheral interface (SPI) eases host

processor and ADC integration. A wide data clocking window,

multiple serial data output (SDO) lanes, and optional dual data rate

(DDR) data clocking can reduce the serial clock to 10 MHz while

operating at a sample rate of 2 MSPS. Echo clock mode can relax

the timing requirements and simplify the use of digital isolators.

The ball grid array (BGA) package of the AD4630-16 integrates all

critical power supply and reference bypass capacitors, reducing the

footprint and system component count, and lessening sensitivity to

board layout.

FEATURES

? High performance

? Throughput: 2 MSPS per channel maximum

? INL: ±3 ppm maximum from ?40°C to +125°C

? SNR: 97.4 dB typical

? THD: ?127 dB typical

? NSD: ?157.4 dBFS/Hz typical

? Low power

? 15 mW per channel at 2 MSPS

? 1.5 mW per channel at 10 kSPS

? Easy Drive features reduce system complexity

? Low 0.6 μA input current for dc inputs

? Wide common-mode input range: ?(1/128) × VREF to

+(129/128) × VREF

? Flexible external reference voltage range: 4.096 V to 5 V

? Accurate integrated reference buffer with 2 μF bypass

capacitor

? Programmable block averaging filter with up to 216 decimation

? Extended sample resolution to 30 bits

? Over range and synchronization bits

? Flexi-SPI digital interface

? 1, 2, or 4 SDO lanes per channel allows slower SCK

? Echo clock mode simplifies use of digital isolator

? Compatible with 1.2 V to 1.8 V logic

? 7 mm × 7 mm 64-Ball CSP_BGA package with internal supply

and reference capacitors to help reduce system footprint

APPLICATIONS

? Automatic test equipment

? Digital control loops

? Medical instrumentation

? Seismology

? Semiconductor manufacturing

? Scientific instrumentation