●Product Details
●The AD7631 is an 18-bit, charge redistribution, successive approximation register (SAR), architecture analog-to-digital converter (ADC) fabricated on Analog Devices, Inc.’s _i_CMOS 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 AD7631 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 AD7631 features four different analog input ranges. Power is scaled linearly with throughput. Operation is specified from −40°C to +85°C.
●Applications
● Process controls
● High speed data acquisition
● Digital signal processing
● Spectrum analysis ATE
●### 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: 250 kSPS
● INL: ±1.5 LSB typical, ±2.5 LSB maximum (±9.5 ppm of FSR)
● 18-bit resolution with no missing codes
● Dynamic range: 102.5 dB
● SNR: 101 dB @ 2 kHz
● THD: −112 dB @ 2 kHz
● _i_CMOS® 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
