ADI AD7863BRZ-3

The AD7863 is a high speed, low power, dual 14-bit analog-to-digital converter that operates from a single 5 V supply. The part contains two 5.2 μs successive approximation ADCs, two track/hold amplifiers, an internal 2.5 V reference and a high speed parallel interface. Four analog inputs are grouped into two channels (A and B) selected by the A0 input. Each channel has two inputs ( V_A1 and V_A2 or V_B1 and V_B2 ) that can be sampled and converted simultaneously, thus preserving the relative phase information of the signals on both analog inputs. The part accepts an analog input range of ±10 V (AD7863-10), ±2.5 V (AD7863-3), and 0 V to 2.5 V (AD7863-2). Overvoltage protection on the analog inputs for the part allows the input voltage to go to ±17 V, ±7 V, or +7 V respectively, without causing damage. A single conversion start signal (CONVST) simultaneously places both track/holds into hold and initiates conversion on both channels. The BUSY signal indicates the end of conversion and at this time the conversion results for both channels are available to be read. The first read after a conversion accesses the result from V_A1 or V_B1, and the second read accesses the result from V_A2 or V_B2, depending on whether the multiplexer select (A0) is low or high, respectively. Data is read from the part via a 14-bit parallel data bus with standard CS and RD signals. In addition to the traditional dc accuracy specifications such as linearity, gain, and offset errors, the part is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio. The AD7863 is fabricated in the linear compatible CMOS (LC²MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. It is available in 28-lead SOIC_W and SSOP.

• Two fast 14-bit ADCs
• Four input channels
• Simultaneous sampling and conversion
• 5.2 μs conversion time
• Single supply operation
• Selection of input ranges ±10 V for AD7863-10, ±2.5 V for AD7863-3, 0 V to 2.5 V for AD7863-2
• High speed parallel interface
• Low power, 70 mW typical
• Power saving mode, 105 μW maximum
• Overvoltage protection on analog inputs
• 14-bit lead compatible upgrade to AD7862