XRD8785

The XRD8785 is an 8-bit Analog-to-Digital Converter. Designed using an advanced 5V CMOS process, this part offers excellent performance, low power consumption and latch-up free operation.

This device uses a two-step flash architecture to maintain low power consumption at high conversion rates. The input circuitry of the XRD8785 includes an on-chip S/H function which allows the user to digitize analog input signals between AGND and AV_DD. Careful design and chip layout have achieved a low analog input capacitance. This reduces "kickback" and eases the requirements of the buffer/amplifier used to drive the XRD8785.

The designer can choose the internally generated reference voltages by connecting V_RB to V_RBS and V_RT to V_RTS, or provide external reference voltages to the V_RB and V_RT pins. The internal reference generates 0.6 V at V_RB and 2.6 V at V_RT. Providing external reference voltages allows easy interface to any input signal range between AGND and AV_DD. This also allows the system to adjust these voltages to cancel zero scale and full scale errors, or to change the input range as needed.

The device operates from a single +5 V supply. Power consumption is 85 mW at FS = 20MHz.

Specified for operation over the commercial / industrial (-40 to +85°C) temperature range, the XRD8785 is available in Plastic dual-in-line (PDIP) and Surface Mount (SOIC) packages in EIAJ and JEDEC.