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AD7849 датащи(PDF) 1 Page - Analog Devices |
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AD7849 датащи(HTML) 1 Page - Analog Devices |
1 / 15 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 Serial Input, 14-Bit/16-Bit DAC AD7849* FEATURES 14-Bit/16-Bit Multiplying DAC Guaranteed Monotonicity Output Control on Power-Up and Power-Down Internal or External Control Versatile Serial Interface DAC Clears to 0 V in Both Unipolar and Bipolar Output Ranges APPLICATIONS Industrial Process Control PC Analog I/O Boards Instrumentation GENERAL DESCRIPTION The AD7849 is a 14-bit/16-bit serial input multiplying DAC. The DAC architecture ensures excellent differential linearity performance, and monotonicity is guaranteed to 14 bits for the A grade and to 16 bits for all other grades over the specified temperature ranges. During power-up and power-down sequences (when the supply voltages are changing), the VOUT pin is clamped to 0 V via a low impedance path. To prevent the output of A3 being shorted to 0 V during this time, transmission gate G1 is also opened. These conditions are maintained until the power supplies stabilize and a valid word is written to the DAC register. At this time, G2 opens and G1 closes. Both transmission gates are also externally controllable via the Reset In ( RST IN) control input. For instance, if the RST IN input is driven from a battery super- visor chip, then on power-off or during a brown out, the RST IN input will be driven low to open G1 and close G2. The DAC must be reloaded, with RST IN high, to re-enable the output. Conversely, the on-chip voltage detector output ( RST OUT) is also available to the user to control other parts of the system. FUNCTIONAL BLOCK DIAGRAM VDD VCC R R R R R AD7849 ROFS RST IN VOUT AGND RST OUT G1 G2 SDIN SCLK SYNC CLR BIN/ COMP DCEN SDOUT LDAC VSS DGND DAC LATCH 10/ 12 10/ 12 10-BIT/ 12-BIT DAC A1 A2 16- SEG- MENT SWITCH MATRIX 4 VREF+ VREF– A3 LOGIC CIRCUITRY VOLTAGE MONITOR INPUT LATCH INPUT SHIFT REGISTER/ CONTROL LOGIC The AD7849 has a versatile serial interface structure and can be controlled over three lines to facilitate opto-isolator applications. SDOUT is the output of the on-chip shift register and can be used in a daisy-chain fashion to program devices in the multi- channel system. The DCEN (Daisy Chain Enable) input con- trols this function. The BIN/COMP pin sets the DAC coding; with BIN/COMP set to 0, the coding is straight binary; and with it set to 1, the coding is 2s complement. This allows the user to reset the DAC to 0 V in both the unipolar and bipolar output ranges. The part is available in a 20-lead DIP and 20-lead SOIC package. *Protected by U.S. Patent No. 5,319,371. 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 |
Аналогичный номер детали - AD7849 |
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Аналогичное описание - AD7849 |
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