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

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.

Product Highlights

* High Resolution, Fast Throughput. The AD7674 is an

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

latency).

* Excellent Accuracy. The AD7674 has a maximum integral

nonlinearity of 2.5 LSB with no missing 18-bit codes.

* 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.

Applications

* CT scanners

* High dynamic data acquisition

* Geophone and hydrophone sensors

* ∑-∆ replacement (low power, multichannel)

* Instrumentation

* Spectrum analysis

* Medical instruments

* 18-bit resolution with no missing codes

* No pipeline delay (SAR architecture)

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

* Throughput

* 800 kSPS (warp mode)

* 666 kSPS (normal mode)

* 570 kSPS (impulse mode)

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

* Dynamic range : 103 dB typ (VREF = 5 V)

* SINAD: 100 dB typ at 2 kHz (VREF = 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

* See data sheet for additional features