AD7769

a LC2MOS Analog I/O Port AD7769* FEATURES Two-Channel, 8-Bit 2.5 ␮s ADC Two 8-Bit, 2.5 ␮s DACs with Output Amplifiers Span and Offset of ADC and DAC Independently Adjustable Low Power FUNCTIONAL BLOCK DIAGRAM APPLICATIONS Winchester Disk Servo Controllers Floppy Disk Microstepping Closed Loop Servo Systems OGENERAL DESCRIPTION BThe AD7769 is a complete, two-channel, 8-bit, analog I/O port. SIt has versatile input and output signal conditioning features that make it ideal for use in head-positioning servos in Winches- Oter disk systems. It is equally suitable for floppy disk microstep- ping head positioning, other closed loop digital servo systems Land general purpose 8-bit data acquisition. EThe AD7769 contains a high speed successive approximation TADC, preceded by a two-channel multiplexer and signal condiEtioning circuits. The input span of the ADC and the offset of PRODUCT HIGHLIGHTS 1. Two-Channel, 8-Bit Analog I/O port on a Single Chip. The AD7769 contains a two-channel, high speed ADC with input signal conditioning and two, fast settling 8-bit DACs with output amplifiers, on a single chip. 2. Independent Control of Span and Offset. The input voltage span of the ADC and the midpoint of the the zero point from ground can be independently set by apply- transfer function, the output voltage swing of the two DACs ing ground referenced voltages. The AD7769 also contains two and the half-scale output voltage, can be set independently independent, fast settling, 8...