Differential Input, Quad,14-Bit, Simultaneous Sampling, SAR ADC

The AD7381-4 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 4 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 AD7381-4 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. Alternatively, an external reference up to 3.3 V can be used.

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.

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, 4 MSPS at 14-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.

* 14-bit ADC family

* Quad simultaneous sampling

* Fully differential analog inputs

* Wide common-mode range

* High throughput rate: 4 MSPS

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

* On-chip oversampling function

* INL (maximum): 1.5 LSB