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Description

The AD7661 is a 16-bit, 100 kSPS, charge redistribution SAR analog-to-digital converter that operates from a single 5 V power supply. The part contains a high speed 16-bit sampling ADC, an internal conversion clock, internal reference, error correction circuits, and both serial and parallel system interface ports.

The IC 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.

The AD7661 is available in a 48-lead LQFP and a tiny 48-lead LFCSP with operation specified from –40°C to +85°C.

Features

* 2.5 V internal reference: typical drift 3 ppm/°C
* Guaranteed max drift 15 ppm/°C
* Throughput: 100 kSPS
* INL: ±2.5 LSB max (±0.0038% of full scale)
* 16-bit resolution with no missing codes
  (1) S/(N+D): 88 dB min @ 20 kHz
  (2) THD: –96 dB max @ 20 kHz
* Analog input voltage range: 0 V to 2.5 V
* Both AC and DC specifications
* No pipeline delay
* Single 5 V supply operation
* Power dissipation
16 mW typ, 160 µW @ 1 kSPS without REF
40 mW typ with REF
* Pin-to-pin compatible with PulSAR ADCs

Applications 

* Data acquisition
* Medical instruments
* Digital signal processing
* Spectrum analysis
* Instrumentation
* Battery-powered systems
* Process control