GENERAL DESCRIPTION

The AD7667is a 16-bit, 1 MSPS, 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. It features a very high sampling rate mode (Warp), a fast mode (Normal) for asynchronous applications, and a reduced power mode (Impulse) for low power applications where power is scaled with the throughput. The AD7667 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.

FEATURES

2.5 V internal reference: typical drift 3 ppm/°C

Guaranteed max drift 15 ppm/°C

Throughput:

1 MSPS (Warp mode)

800 kSPS (Normal mode)

666 kSPS (Impulse mode)

INL: ±2.0 LSB max (±0.0038 of full scale)

16-bit resolution with no missing codes

S/(N+D): 88 dB min @ 20 kHz

THD: –96 dB max @ 20 kHz

Analog input voltage range: 0 V to 2.5 V

No pipeline delay

Parallel and serial 5 V/3 V interface

SPI®/QSPI

TM

/MICROWIRE

TM

/DSP compatible

Single 5 V supply operation

Power dissipation

87 mW typ @ 666 kSPS, 130 µW @ 1 kSPS without REF

133 mW typ @1 MSPS with REF

48-lead LQFP and 48-lead LFCSP packages

Pin-to-pin compatible with AD7671, AD7677

APPLICATIONS

Data acquisition

Medical instruments

Digital signal processing

Battery-powered systems

Process control