LC2MOS Complete, 14-Bit Analog I/O System AD7869
FEATURES Complete 14-Bit l/O System, Comprising 14-Bit ADC with Track/Hold Amplifier 83 kHz Throughput Rate 14-Bit DAC with Output Amplifier 3.5 s Settling Time On-Chip Voltage Reference Operates from ؎5 V Supplies Low Power—130 mW typ Small 0.3" Wide DIP APPLICATIONS Digital Signal Processing Speech Recognition and Synthesis Spectrum Analysis High Speed Modems DSP Servo Control
FUNCTIONAL BLOCK DIAGRAM VDD RI DAC R
DAC SERIAL INTERFACE
ADC SERIAL INTERFACE
Interfacing to both the DAC and ADC is serial, minimizing pin count and giving a small 24-pin package size. Standard control signals allow serial interfacing to most DSP machines. Asynchronous ADC conversion control and DAC updating is made possible with the CONVST and LDAC logic inputs. The AD7869 operates from ± 5 V power supplies; the analog input/output range of the ADC/DAC is ± 3 V. The part is fully specified for dynamic parameters such as signal-to-noise ratio and harmonic distortion as well as traditional dc specifications. The part is available in a 24-pin, 0.3 inch wide, plastic or hermetic dual-in-line package (DIP) and in a 28-pin, plastic SOIC package.
RO ADC R
The AD7869 is a complete 14-bit I/O system containing a DAC and an ADC. The ADC is a successive approximation type with a track-and-hold amplifier, having a combined throughput rate of 83 kHz. The DAC has an output buffer amplifier with a settling time of 4 µs to 14 bits. Temperature compensated 3 V buried Zener references provide precision references for the DAC and ADC.
DAC 3V REFERENCE ADC 3V REFERENCE
14 BIT DAC
TFS TCLK DT
14 BIT ADC
1. Complete 14-Bit I/O System. The AD7869 contains a 14-bit ADC with a track-and-hold amplifier and a 14-bit DAC with output amplifier. Also in cluded are separate on-chip voltage references for the DAC and the ADC. 2. Dynamic Specifications for DSP Users. In addition to traditional dc specifications, the AD7869 is specified for ac parameters, including signal-to-noise ratio and harmonic distortion. These parameters, along with important timing parameters, are tested on every device. 3. Small Package. The AD7869 is available in a 24-pin DIP and a 28-pin SOIC package.
REV. A 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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