AD7634 18-Bit, 670 kSPS, Differential Programmable Input PulSAR® ADC

CT scanners High dynamic data acquisition Σ-Δ replacement Spectrum analysis Medical instruments Instrumentation Process controls

The AD7634 is an 18-bit charge redistribution successive approximation register (SAR), architecture analog-to- digital converter (ADC) fabricated on Analog Devices, Inc.’s iCMOS high voltage process. The device is configured through hardware or via a dedicated write-only serial configuration port for input range and operating mode. The AD7634 contains a high speed 18-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and both serial and parallel system interface ports. A falling edge on CNVST samples the fully differential analog inputs on IN+ and IN−. The AD7634 features four different analog input ranges and three different sampling modes. Operation is specified from −40°C to +85°C.

Applications

Features and Benefits

Multiple pins/software-programmable input ranges
5 V (10 V p-p), +10 V (20 V p-p),
±5 V (20 V p-p),
±10 V (40 V p-p)
Pins or serial SPI®-compatible input ranges/mode selection
Throughput
670 kSPS (warp mode)
570 kSPS (normal mode)
450 kSPS (impulse mode)
18-bit resolution with no missing codes
INL: ±1.5 LSB typical, ±2.5 LSB maximum (±9.5 ppm of FSR)

Dynamic range: 102.5 dB
SNR: 101 dB @ 2 kHz
THD: −112 dB @ 2kHz
iCMOS® process technology
5 V internal reference: typical drift 3 ppm/°C; TEMP output
No pipeline delay (SAR architecture)
Parallel (18-/16-/8-bit bus) and serial 5 V/3.3 V interface

Analog to Digital Converters

A/D Converters

Building Technology

Heating Ventilation and Air Conditioning
White Goods and Vending

Data Sheets

Document	note
AD7634: 18-Bit, 670 kSPS, Differential Programmable Input PulSAR® ADC Data Sheet (Rev. B)	PDF 2668 kB

Application Notes

Document	note
AN-931: Understanding PulSAR ADC Support Circuitry (Rev. 0)	PDF 299 kB
AN-932: Power Supply Sequencing (Rev. 0)	PDF 95 kB

Order Information

Part Number	Package	Packing Qty	Temp Range	Price 100-499	Price 1000+	RoHS
AD7634BCPZ Production	48 ld LFCSP 7x7mm (5.1EP)	OTH 260	-40 to 85C	35.21	31.83	Y
AD7634BCPZRL Last Time Buy	48 ld LFCSP 7x7mm (5.1EP)	REEL 2500	-40 to 85C	0	31.83	Y
AD7634BSTZ Production	48 ld LQFP	OTH 250	-40 to 85C	35.21	31.83	Y
AD7634BSTZRL Last Time Buy	48 ld LQFP	REEL 2000	-40 to 85C	0	31.83	Y