ANALOG DEVICES AD7679 Data Sheet

18-Bit, 2.5 LSB INL, 570 k SPS SAR ADC

AD7679

FEATURES FUNCTIONAL BLOCK DIAGRAM

18-bit resolution with no missing codes PDBUF REF REFGND DGNDDVDD

No pipeline delay (SAR architecture) AGND

AVDD AD7679

Differential input range: ±VREF (VREF up to 5 V)

SERIAL OGND

Throughput: 570 k SPS REFBUFIN PORT

INL: ±2.5 LSB max (±9.5 ppm of full scale) IN+

SWITCHED

Dynamic range : 103 d B typ (VREF = 5 V) IN– CAP DAC

S/(N+D): 100 d B typ @ 2 k Hz (VREF = 5 V) PARALLEL

INTERFACE RD

Parallel (18-,16-, or 8-bit bus) and serial 5 V/3 V interface

CLOCK

SPI®/QSPI™/MICROWIRE™/DSP compatible

PD CONTROL LOGIC AND MODE0

On-board reference buffer CALIBRATION CIRCUITRY

RESET MODE1

Single 5 V supply operation Power dissipation: 76 m W @ 500 k SPS

CNVST

150 µW @ 1 k SPS 03085–0–001

48-lead LQFP or 48-lead LFCSP package

Figure 1. Functional Block Diagram

Pin-to-pin compatible upgrade of AD7674/AD7676/AD7678

APPLICATIONS Table 1. Pul SAR Selection

CT scanners 800–

Type/k SPS 100–250 500–570

High dynamic data acquisition

Pseudo- AD7651 AD7650/AD7652 AD7653

Geophone and hydrophone sensors

Differential AD7660/AD7661 AD7664/AD7666 AD7667

Σ-∆ replacement (low power, multichannel)

www.BDTIC.c True Bipolar AD7663 AD7665 AD7671 m/A

Instrumentation

True AD7675 AD7676 AD7677

Spectrum analysis

Differential

Medical instruments

18-Bit AD7678 AD7679 AD7674

Multichannel/ AD7654

GENERAL DESCRIPTION Simultaneous AD7655

The AD7679 is an 18-bit, 570 k SPS, charge redistribution SAR, fully differential analog-to-digital converter that operates on a

PRODUCT HIGHLIGHTS

single 5 V power supply. The part contains a high speed 18-bit

sampling ADC, an internal conversion clock, an internal 1. High Resolution, Fast Throughput. reference buffer, error correction circuits, and both serial and The AD7679 is a 570 k SPS, charge redistribution, 18-bit parallel system interface ports. SAR ADC (no latency).

The part is available in a 48-lead LQFP or 48-lead LFCSP with 2. Excellent Accuracy. operation specified from –40°C to +85°C. The AD7679 has a maximum integral nonlinearity of 2.5 LSB with no missing 18-bit codes.

3. Serial or Parallel Interface. Versatile parallel (18-, 16-, or 8-bit bus) or 3-wire serial interface arrangement compatible with both 3 V and 5 V logic.

Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use.

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