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...
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...