AD7609 Datasheet

• 8 simultaneously sampled inputs
• True differential inputs
• True bipolar analog input ranges: ±20 V, ±10 V
• Single 5 V analog supply and 2.3 V to 5.25 V V_DRIVE
• Fully integrated data acquisition solution
  • Analog input clamp protection
  • Input buffer with 1 MΩ analog input impedance
  • Second-order antialiasing analog filter
  • On-chip accurate reference and reference buffer
  • 18-bit ADC with 200 kSPS on all channels
  • Oversampling capability with digital filter
• Flexible parallel/serial interface
• SPI/QSPI^™/MICROWIRE^™/DSP compatible
• Performance
  • 7 kV ESD rating on analog input channels
  • 98 dB SNR, −107 dB THD
  • Dynamic range: up to 105 dB typical
  • Low power: 100 mW
  • Standby mode: 25 mW
• 64-lead LQFP package

• Power line monitoring and protection systems
• Multiphase motor control
• Instrumentation and control systems
• Multiaxis positioning systems
• Data acquisition systems (DAS)

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 analog-to-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 ±20 V and ±10 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 on each analog input pin. 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.