GENERAL DESCRIPTION
The 16-bit AD7383-4 and 14-bit AD7384-4 are pin-compatible,
quad, simultaneous sampling, high speed, successive approximation
register (SAR), analog-to-digital converters (ADCs) operating
from a 3.0 V to 3.3 V power supply with throughput rates up to
4 MSPS. The analog input type is a pseudo differential and is
sampled and converted on the falling edge of CS.
The AD7383-4/AD7384-4 have on-chip oversampling blocks to
improve dynamic range and reduce noise at lower bandwidths. The
oversampling boosts up to two bits of added resolution. 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 easy interfacing to microprocessors or digital signal
processors (DSPs). The conversion result can clock out simultaneously
via 4-wire mode for faster throughput or via 1-wire serial
mode when slower throughput is allowed. The devices are compatible
with 1.8 V, 2.5 V, and 3.3 V interfaces using the separate logic supply.

FEATURES
► 16-bit and 14-bit ADC family
► Quad simultaneous sampling
► Pseudo differential analog inputs
► High throughput rate: 4 MSPS
► SNR: 86.7 dB (typical) at VREF = 3.3 V (AD7383-4)
► On-chip oversampling function
► SNR: 91 dB (typical) with OSR = 8×, RES = 1
► 2-bit resolution boost
► Out of range indicator (ALERT)
► INL: 3.8 LSBs (maximum)
► High speed serial interface
► Temperature range: −40°C to +125°C
► 24-lead, 4 mm × 4 mm LFCSP

APPLICATIONS
► Motor control position feedback
► Motor control current sense
► Data acquisition systems
► Erbium-doped fiber amplifier (EDFA) applications
► Inphase and quadrature demodulation

PRODUCT HIGHLIGHTS
1. Quad simultaneous sampling and conversion.
2. Pin-compatible product family.
3. High 4 MSPS throughput rate.
4. Space-saving 4 mm × 4 mm LFCSP.
5. Integrated oversampling block to increase dynamic range, reduce
noise, and reduce SCLK speed requirements.
6. Pseudo differential analog inputs.
7. Small sampling capacitor reduces amplifier drive burden.