ADI AD7865ASZ-1

The AD7865 is a fast, low power, four-channel simultaneous sampling 14-bit A/D converter that operates from a single 5V supply. The part contains a 2.4μs successive approximation ADC, four track/hold amplifiers, 2.5V reference, on-chip clock oscillator, signal conditioning circuitry and a high speed parallel interface. The input signals on four channels are sampled simultaneously thus preserving the relative phase information of the signals on the four analog inputs. The part accepts analog input ranges of ±10V, ±5V, ±2.5V, 0V to 2.5V and 0V to 5V. The part allows any subset of the four channels to be converted in order to maximize the throughput rate on the selected sequence. The channels to be converted can be selected either via hardware (channel select input pins) or via software (programming the channel select register). A single conversion start signal (CONVST) simultaneously places all the track/holds into hold and initiates conversion sequence for the selected channels. The EOC signal indicates the end of each individual conversion in the selected conversion sequence. The BUSY signal indicates the end of the conversion sequence. Data is read from the part via a 14-bit parallel data bus using the standard CS and RD signals. Maximum throughput for a single channel is 350kSPS. For all four channels the maximum throughput is 100kSPS.

• Fast (2.4 μs) 14-Bit ADC
• Four Simultaneously Sampled Inputs
• Four Track/Hold Amplifiers
• 0.35μs Track/Hold Acquisition Time
• 2.4μs Conversion Time per Channel
• HW/SW Select of Channel Sequence for Conversion
• Single Supply Operation
• Selection of Input Ranges: ±10V, ±5V and ±2.5V, 0V to 5V and 0V to 2.5V
• High Speed Parallel Interface Which Also Allows Interfacing to 3V Processors
• Low Power, 115mW Typ
• Power Saving Mode, 15μW Typ
• Overvoltage Protection on Analog Inputs

• AC Motor Control
• Uninterruptible Power Supplies
• Industrial Power Meter/Monitors
• Data Acquisition Systems
• Communications