18-Bit, 2 MSPS SAR ADC

The AD7641 is a 18-bit, 2 MSPS, charge redistribution SAR, fully differential analog-to-digital converter that operates from a single 2.5 V power supply. The part contains a high-speed 18-bit sampling ADC, an internal conversion clock, an internal reference buffer, error correction circuits, and both serial and parallel system interface ports. It features a very high sampling rate mode (Warp) and a fast mode (Normal) for asynchronous conversion rate applications.

The AD7641 is hardware factory calibrated and comprehensively tested to ensure ac parameters such as signal-to-noise ratio (SNR) and total harmonic distortion (THD) in addition to the more traditional dc parameters of gain, offset and linearity.

Operation is specified from −40°C to +85°C.

PRODUCT HIGHLIGHTS

* Fast Throughput.

The AD7641 is a 2 MSPS, charge redistribution,

18-bit SAR ADC.

* Superior Linearity.

The AD7641 has no missing 18-bit code.

* Internal Reference.

The AD7641 has a 2.048 V internal reference with a typical

drift of ±10 ppm/°C and an on-chip TEMP sensor.

* Single-Supply Operation.

The AD7641 operates from a 2.5 V single supply.

* Serial or Parallel Interface.

Versatile parallel (16- or 8-bit bus) or 2-wire serial interface

arrangement compatible with 2.5 V, 3.3 V, or 5 V logic.

APPLICATIONS

* Medical instruments

* High dynamic data acquisition

* Instrumentation

* Spectrum analysis

* ATE

* 18-bit resolution with no missing codes

* 2.5 V internal low drift reference

Throughput:

2 MSPS (Warp mode)

1.5 MSPS (Normal mode)

* Differential input range: ± VREF (VREF up to 2.5 V)

* INL: ±2 LSB typical