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LC2MOS Complete, 8-Bit Analog I/0 Systems AD7569/AD7669

FEATURES 2 ␮s ADC with Track/Hold 1 ␮s DAC with Output Amplifier AD7569, Single DAC Output AD7669, Dual DAC Output On-Chip Bandgap Reference Fast Bus Interface Single or Dual 5 V Supplies

AD7569 FUNCTIONAL BLOCK DIAGRAM

GENERAL DESCRIPTION

The AD7569/AD7669 is a complete, 8-bit, analog I/O system on a single monolithic chip. The AD7569 contains a high speed successive approximation ADC with 2 µs conversion time, a track/ hold with 200 kHz bandwidth, a DAC and an output buffer amplifier with 1 µs settling time. A temperature-compensated 1.25 V bandgap reference provides a precision reference voltage for the ADC and the DAC. The AD7669 is similar, but contains two DACs with output buffer amplifiers.

AD7669 FUNCTIONAL BLOCK DIAGRAM

A choice of analog input/output ranges is available. Using a supply voltage of +5 V, input and output ranges of zero to 1.25 V and zero to 2.5 volts may be programmed using the RANGE input pin. Using a ± 5 V supply, bipolar ranges of ± 1.25 V or ± 2.5 V may be programmed. Digital interfacing is via an 8-bit I/O port and standard microprocessor control lines. Bus interface timing is extremely fast, allowing easy connection to all popular 8-bit microprocessors. A separate start convert line controls the track/hold and ADC to give precise control of the sampling period.

PRODUCT HIGHLIGHTS

The AD7569/AD7669 is fabricated in Linear-Compatible CMOS (LC2MOS), an advanced, mixed technology process combining precision bipolar circuits with low power CMOS logic. The AD7569 is packaged in a 24-pin, 0.3" wide “skinny” DIP, a 24-terminal SOIC and 28-terminal PLCC and LCCC packages. The AD7669 is available in a 28-pin, 0.6" plastic DIP, 28-terminal SOIC and 28-terminal PLCC package.

1. Complete Analog I/O on a Single Chip. The AD7569/AD7669 provides everything necessary to interface a microprocessor to the analog world. No external components or user trims are required and the overall accuracy of the system is tightly specified, eliminating the need to calculate error budgets from individual component specifications. 2. Dynamic Specifications for DSP Users. In addition to the traditional ADC and DAC specifications, the AD7569/AD7669 is specified for ac parameters, including signal-to-noise ratio, distortion and input bandwidth. 3. Fast Microprocessor Interface. The AD7569/AD7669 has bus interface timing compatible with all modern microprocessors, with bus access and relinquish times less than 75 ns and write pulse width less than 80 ns.

REV. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 1996


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