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

The AD7380-4 is a 16-bit compatible, quad, simultaneous sampling, high speed, successive approximation register (SAR), analog-to-digital converters (ADC) operating from a 3.3 V power supply with throughput rates up to 4 MSPS. The differential analog input accepts a wide common-mode input voltage and is sampled and converted on the falling edge of CS.

The AD7380-4 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. The REFIN pin can have a reference voltage 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.

The AD7380-4 is available in a 24-lead lead frame chip scale package (LFCSP) and operates over a temperature range of −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, 4 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

* High throughput rate: 4 MSPS

* SNR: 91 dB (typical) at VREF = 3.3 V

* On-chip oversampling function

* SNR: 97.7 dB (typical) with OSR = 8×, RES = 1