AD7679

Features:

18-bit resolution with no missing codes
No pipeline delay (SAR architecture)
Differential input range: ±V_REF (V_REF up to 5 V)
Throughput: 570 kSPS
INL: ±2.5 LSB max (±9.5 ppm of full scale)
Dynamic range : 103 dB typ (V_REF = 5 V)
S/(N+D): 100 dB typ @ 2 kHz (V_REF = 5 V)
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: 76 mW @ 500 kSPS
150 W @ 1 kSPS
48-lead LQFP or 48-lead LFCSP package
Pin-to-pin compatible upgrade of AD7674/AD7676/AD7678




Application

CT scanners
High dynamic data acquisition
Geophone and hydrophone sensors
- replacement (low power, multichannel)
Instrumentation
Spectrum analysis
Medical instruments




Pinout








Specifications

Parameter	Rating
Analog Inputs IN+2, IN2, REF, REFBUFIN, REFGND to AGND	AVDD + 0.3 V to AGND 0.3 V
Ground Voltage Differences AGND, DGND, OGND	±0.3 V
Supply Voltages AVDD, DVDD, OVDD AVDD to DVDD, AVDD to OVDD DVDD to OVDD Digital Inputs	0.3 V to +7 V ±7 V 0.3 V to +7 V 0.3 V to DVDD + 0.3 V
Internal Power Dissipation3	700 mW
Internal Power Dissipation4	2.5 W
Junction Temperature	150°C
Storage Temperature Range	65°C to +150°C
Lead Temperature Range (Soldering 10 sec)	300°C

Description

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

The part is available in a 48-lead LQFP or 48-lead LFCSP with operation specified from 40°C to +85°C.