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AD7868AN Datasheet(PDF) 1 Page - Analog Devices |
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AD7868AN Datasheet(HTML) 1 Page - Analog Devices |
1 / 16 page 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. a LC2MOS Complete, 12-Bit Analog I/O System AD7868 © Analog Devices, Inc., 1996 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FUNCTIONAL BLOCK DIAGRAM RO DAC RI DAC DGND AD7868 R R RO ADC AGND CLOCK R R 12-BIT DAC DAC SERIAL INTERFACE ADC SERIAL INTERFACE 12-BIT ADC DAC 3V REFERENCE ADC 3V REFERENCE TRACK/HOLD VIN VOUT LDAC TFS TCLK DT CONTROL RFS RCLK DR CLK CONVST VDD VSS FEATURES Complete 12-Bit I/O System, Comprising: 12-Bit ADC with Track/Hold Amplifier 83 kHz Throughout Rate 72 dB SNR 12-Bit DAC with Output Amplifier 3 s Settling Time 72 dB SNR 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 GENERAL DESCRIPTION The AD7868 is a complete 12-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 3 µs to 12 bits. Temperature compensated 3 V buried Zener references provide precision references for the DAC and ADC. 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. Asyn- chronous ADC conversion control and DAC updating is made possible with the CONVST and LDAC logic inputs. The AD7868 operates from ±5 V power supplies, the analog in- put/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" wide, plastic or hermetic dual-in-line package (DIP) and in a 28-pin, plastic SOIC package. PRODUCT HIGHLIGHTS 1. Complete 12-Bit I/O System. The AD7868 contains a 12-bit ADC with a track-and-hold amplifier and a 12-bit DAC with output amplifier. Also included 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 AD7868 is specified for ac parameters including signal-to-noise ratio and harmonic distortion. These parameters along with im- portant timing parameters are tested on every device. 3. Small Package. The AD7868 is available in a 24-pin DIP and a 28-pin SOIC package. |
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