AD7891AS-1

The AD7891AP-1 is an eight-channel 12-bit data acquisition system with a choice of either parallel or serial interface structure. The features of AD7891AP-1 are: (1)Fast 12-Bit ADC with 1.6 ms Conversion Time; (2)Eight Single-Ended Analog Input Channels; (3)Overvoltage Protection on Each Channel; (4)Selection of Input Ranges: 65 V, 610 V for AD7891-1, 0 to +2.5 V, 0 to +5 V, 62.5 V for AD7891-2; (5)Parallel and Serial Interface; (6)On-Chip Track/Hold Amplifier; (7)On-Chip Reference; (8)Single Supply, Low Power Operation (85 mW max); (9)Power-Down Mode (75 mW typ).

The following is about the absolute maximum ratings of AD7891AP-1: (1)VDD to AGND: 0.3 V to +7 V; (2)VDD to DGND: 0.3 V to +7êV; (3)Analog Input Voltage to AGND: ±17V; (4)Reference Input Voltage to AGND: 0.3 V to VDD + 0.3êV; (5)Digital Input Voltage to DGND: 0.3 V to VDD + 0.3 V; (6)Digital Output Voltage to DGND: 0.3 V to VDD + 0.3 V; (7)Operating Temperature Range: Commercial (A, B Version): 40°C to +85°C, Automotive (Y Version): 55°C to +105°C; (8)Storage Temperature Range: 65°C to +150°C.

The electrical characteristics of the AD7891AP-1 are: (1)Signal to (Noise + Distortion) Ratio @ +25°C: 70dB min or TMIN to TMAX 70 dB min; (2)Total Harmonic Distortion: 78 dB max; (3)Peak Harmonic or Spurious Noise: 80 dB max; (4)Intermodulation Distortion: 2nd Order Terms: 80 dB typ and 3rd Order Terms 80 dB typ at fa = 9 kHz, fb = 9.5 kHz; (5)Channel-to-Channel Isolation: 80 dB max.