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AD7846KN 데이터시트(PDF) 1 Page - Analog Devices |
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AD7846KN 데이터시트(HTML) 1 Page - Analog Devices |
1 / 16 page REV. E 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 16-Bit Voltage Output DAC AD7846 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 FEATURES 16-Bit Monotonicity over Temperature 2 LSBs Integral Linearity Error Microprocessor Compatible with Readback Capability Unipolar or Bipolar Output Multiplying Capability Low Power (100 mW Typical) GENERAL DESCRIPTION The AD7846 is a 16-bit DAC constructed with Analog Devices’ LC 2MOS process. It has V REF+ and VREF– reference inputs and an on-chip output amplifier. These can be configured to give a unipolar output range (0 V to +5 V, 0 V to +10 V) or bipolar output ranges ( ±5 V, ±10 V). The DAC uses a segmented architecture. The 4 MSBs in the DAC latch select one of the segments in a 16-resistor string. Both taps of the segment are buffered by amplifiers and fed to a 12-bit DAC, which provides a further 12 bits of resolution. This architecture ensures 16-bit monotonicity. Excellent integral linearity results from tight matching between the input offset voltages of the two buffer amplifiers. In addition to the excellent accuracy specifications, the AD7846 also offers a comprehensive microprocessor interface. There are 16 data I/O pins, plus control lines ( CS, R/W, LDAC and CLR). R/ W and CS allow writing to and reading from the I/O latch. This is the readback function which is useful in ATE applica- tions. LDAC allows simultaneous updating of DACs in a multi- DAC system and the CLR line will reset the contents of the DAC latch to 00 . . . 000 or 10 . . . 000 depending on the state of R/ W. This means that the DAC output can be reset to 0 V in both the unipolar and bipolar configurations. The AD7846 is available in 28-lead plastic, ceramic, and PLCC packages. FUNCTIONAL BLOCK DIAGRAM A2 A1 A3 16 SEGMENT SWITCH MATRIX R R R 12-BIT DAC DAC LATCH I/O LATCH CONTROL LOGIC AD7846 R R VREF – VREF + VSS DGND CLR LDAC R/ W CS VOUT RIN VDD VCC 4 12 12 DB15 DB0 PRODUCT HIGHLIGHTS 1. 16-Bit Monotonicity The guaranteed 16-bit monotonicity over temperature makes the AD7846 ideal for closed-loop applications. 2. Readback The ability to read back the DAC register contents minimizes software routines when the AD7846 is used in ATE systems. 3. Power Dissipation Power dissipation of 100 mW makes the AD7846 the lowest power, high accuracy DAC on the market. |
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