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