Differential Input, Quad, Internal Reference Simultaneous Sampling, 16-Bit SAR ADC

The AD7389-4 a 16-bit, quad, simultaneous sampling, high speed, successive approximation register (SAR), analog-to-digital converter (ADC) that operates from a 3.0 V to 3.6 V power supply and features throughput rates up to 2 MSPS. The analog input type is differential, accepts a wide common-mode input voltage, and the analog inputs are sampled and converted on the falling edge of CS.

The AD7389-4 has 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. A buffered internal 2.5 V reference (10 ppm/°C) is included.

The conversion process and data acquisition use standard control inputs allowing for 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.

The AD7389-4 is available in a 24-lead lead frame chip scale package (LFCSP) with operation specified from −40°C to +125°C.

APPLICATIONS

* Motor control position feedback

* Motor control current sense

* Data acquisition systems

* Erbium doped fiber amplifier (EDFA) applications

* In phase and quadrature demodulation

PRODUCT HIGHLIGHTS

* Quad simultaneous sampling and conversion.

* Pin-compatible product family.

* High throughput rate, 2 MSPS at 16-bit.

* Space-saving, 4 mm × 4 mm LFCSP.

* 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.

* 16-bit ADC family

* Quad simultaneous sampling

* Fully differential analog inputs

* Wide common-mode range

* High throughput rate: 2 MSPS

* Buffered 2.5 V internal voltage reference (10 ppm/°C)

* On-chip oversampling function

* INL (maximum): 2 LSBs