GENERAL DESCRIPTION
The AD7386-4/AD7387-4/AD7388-4 are 16-bit, 14-bit, and 12-bit
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 single-ended analog input accepts voltage from
0 V to VREF, and is sampled and converted on the falling edge of
CS.
The AD7386-4/AD7387-4/AD7388-4 have on-chip oversampling
blocks to improve dynamic range and reduce noise at lower
bandwidths. The oversampling can boost up to two bits of added
resolution. The REFIO pin can have a reference voltage (VREF) of
2.5 V to 3.3 V.
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 device is compatible
with 1.8 V, 2.5 V, and 3.3 V interfaces using the separate logic supply.

FEATURES
► 16-bit, 14-bit, and 12-bit ADC family
► Quad simultaneous sampling
► Single-ended analog inputs
► High throughput rate: 4 MSPS
► SNR (typical)
► 84.7 dB (AD7386-4) at VREF = 3.3 V
► 82.4 dB (AD7387-4) at VREF = 3.3 V
► 73.7 dB (AD7388-4)
► 92 dB with OSR = 8, VREF = 3.3 V (AD7386-4)
► On-chip oversampling function
► 2-bit resolution boost
► Out of range indicator (ALERT)
► INL (typical)
► ±4 LSB (AD7386-4)
► ±1 LSB (AD7387-4)
► ±0.2 LSB (AD7388-4)
► High-speed serial interface
► Temperature range: −40°C to +125°C
► 2.5 V internal reference at 10 ppm/°C (maximum)
► 24-lead LFCSP

APPLICATIONS
► Motor control position feedback
► Motor control current sense
► Data acquisition systems
► Erbium doped fiber amplifier (EDFA) applications
► Traveling wave fault detection
► In-phase and quadrature demodulation

PRODUCT HIGHLIGHTS
1. Quad simultaneous sampling and conversion.
2. Pin-compatible product family.
3. High throughput rate, 4 MSPS at 16-bit, 14-bit, and 12-bit.
4. Space-saving, 24-lead LFCSP.
5. Integrated oversampling block to increase dynamic range, reduce
noise, and reduce SCLK speed requirements.
6. Differential analog inputs with wide common-mode range.
7. Small sampling capacitor reduces amplifier drive burden.