18位双极同步采样ADC的差分数据通道ad7609数据表

　　The AD7609 is an 18-bit， 8-channel， true differential， simultaneous sampling analog-to-digital data acquisition system （DAS）。 The part contains analog input clamp protection， a second-order antialiasing filter， a track-and-hold amplifier， an 18-bit charge redistribution successive approximation analogto-digital converter （ADC）， a flexible digital filter， a 2.5 V reference and reference buffer， and high speed serial and parallel interfaces. The AD7609 operates from a single 5 V supply and can accommodate ±10 V and ±5 V true bipolar differential input signals while sampling at throughput rates up to 200 kSPS for all channels. The input clamp protection circuitry can tolerate voltages up to ±16.5 V. The AD7609 has 1 MΩ analog input impedance regardless of sampling frequency. The single supply operation， on-chip filtering， and high input impedance eliminate the need for driver op amps and external bipolar supplies. The AD7609 antialiasing filter has a −3 dB cutoff frequency of 32 kHz and provides 40 dB antialias rejection when sampling at 200 kSPS. The flexible digital filter is pin driven， yields improvements in SNR， and reduces the −3 dB bandwidth.