18-Bit, 2.5 LSB INL, 800 kSPS, SAR ADC

Data Sheet

AD7674

Rev. B

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FEATURES

18-bit resolution with no missing codes

No pipeline delay (SAR architecture)

Throughput

800 kSPS (warp mode)

666 kSPS (normal mode)

570 kSPS (impulse mode)

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

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

SPI/QSPI™/MICROWIRE/DSP compatible

On-board reference buffer

Single 5 V supply operation

Power dissipation

98 mW typ at 800 kSPS

78 mW typ at 500 kSPS (impulse mode)

160 µW at 1 kSPS (impulse mode)

48-lead LQFP or 48-lead LFCSP

Pin-to-pin compatible upgrade of AD7676, AD7678,

and AD7679

APPLICATIONS

CT scanners

High dynamic data acquisition

Geophone and hydrophone sensors

∑-∆ replacement (low power, multichannel)

Instrumentation

Spectrum analysis

Medical instruments

GENERAL DESCRIPTION

The AD7674 is an 18-bit, 800 kSPS, charge redistribution,

successive approximation register (SAR) fully differential

analog-to-digital converter (ADC) that operates on a single 5 V

power supply. The device 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.

The device is available in a 48-lead LQFP or a 48-lead LFCSP

with operation specified from −40°C to +85°C.

FUNCTIONAL BLOCK DIAGRAM

SWITCHED

CAP DAC

18

CONTROL LOGIC AND

CALIBRATION CIRCUITRY

CLOCK

AD7674

D[17:0]

BUSY

RD

CS

MODE0

OGND

OVDD

DGND

DVDD

AVDD

AGND

REF REFGND

IN+

IN–

PD

RESET

SERIAL

PORT

PARALLEL

INTERFACE

CNVST

PDBUF

REFBUFIN

WARP IMPULSE

MODE1

03083–0–001

Figure 1.

Type

100 kSPS to

250 kSPS

500 kSPS to

570 kSPS

800 kSPS to

1000 kSPS

Pseudo-

Differential

AD7651,

AD7660/

AD7661

AD7650/AD7652,

AD7664/AD7666

AD7653,

AD7667

True Bipolar

AD7663

AD7665

AD7671

True Differential

AD7675

AD7676

AD7677

18-Bit

AD7678

AD7679

AD7674

Multichannel/

Simultaneous

AD7654, AD7655

PRODUCT HIGHLIGHTS

1. High Resolution, Fast Throughput. The AD7674 is an

800 kSPS, charge redistribution, 18-bit, SAR ADC (no

latency).

2. Excellent Accuracy. The AD7674 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.