4MSPS Dual Simultaneous Sampling, 16-BIT SAR ADC, Differential Input

The AD7380/AD7381 are a 16-bit and 14-bit pin-compatible family of dual simultaneous sampling, high speed, low power, successive approximation register (SAR) analog-to-digital converters (ADCs) that operate from a 3.0 V to 3.6 V power supply and feature throughput rates up to 4 MSPS. The analog input type is differential, accepts a wide common-mode input voltage, and is sampled and converted on the falling edge of CS.

An integrated on-chip oversampling block improves dynamic range and reduces noise at lower bandwidths. 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 simple interfacing to microprocessors or digital signal processors (DSPs). The device is compatible with 1.8 V, 2.5 V, and 3.3 V interfaces using the separate logic supply.

The AD7380/AD7381 are available in a 16-lead lead frame chip scale package (LFCSP) with operation specified from −40°C to +125°C.

Product highlights

* Dual simultaneous sampling and conversion with two complete ADC functions.

* Pin-compatible product family.

* High 4 MSPS throughput rate.

* Space saving 3 mm × 3 mm LFCSP.

* An integrated oversampling block to increase dynamic range, reduce noise, and reduce SCLK speed requirements.

* Differential analog inputs with wide common-mode range.

* Small sampling capacitor reduces amplifier drive burden.

Applications

* Motor control position feedback

* Motor control current sense

* Sonar

* Power quality

* Data acquisition systems

* Erbium doped fiber amplifier (EDFA) applications

* I and Q demodulation

* 16-bit/14-bit ADC family

* Dual simultaneous sampling

* Fully differential analog inputs

* 4 MSPS throughput conversion rate

* SNR (typical)

* 92.5 dB, VREF = 3.3 V external at AD7380 (16-bit)

* 85.4 dB, VREF = 3.3 V external at AD7381 (14-bit)

* 101 dB with ×16 OSR

* On-chip oversampling function

* Resolution boost function