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.