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DAC8811IBDGKR Fiches technique(PDF) 8 Page - Texas Instruments |
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DAC8811IBDGKR Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 21 page www.ti.com THEORY OF OPERATION VREF GND IOUT 2R 2R 2R 2R 2R 2R 2R 2R 2R 2R 2R 2R RFB R R R V OUT + *VREF CODE 65536 (1) _ + OPA277 V+ V− 15 V −15 V VO VDD RFB IOUT GND DAC8811 U2 U1 VDD VREF DAC8811 SLAS411B – NOVEMBER 2004 – REVISED FEBRUARY 2007 The DAC8811 is a single channel current output, 16-bit digital-to-analog converter (DAC). The architecture, illustrated in Figure 17, is an R-2R ladder configuration with the three MSBs segmented. Each 2R leg of the ladder is either switched to GND or the IOUT terminal. The IOUT terminal of the DAC is held at a virtual GND potential by the use of an external I/V converter op amp. The R-2R ladder is connected to an external reference input VREF that determines the DAC full-scale current. The R-2R ladder presents a code independent load impedance to the external reference of 5 k Ω ±25%. The external reference voltage can vary in a range of -15 V to 15 V, thus providing bipolar IOUT current operation. By using an external I/V converter and the DAC8811 RFB resistor, output voltage ranges of -VREF to VREF can be generated. Figure 17. Equivalent R-2R DAC Circuit When using an external I/V converter and the DAC8811 RFB resistor, the DAC output voltage is given by Equation 1: Each DAC code determines the 2R leg switch position to either GND or IOUT. Because the DAC output impedance as seen looking into the IOUT terminal changes versus code, the external I/V converter noise gain will also change. Because of this, the external I/V converter op amp must have a sufficiently low offset voltage such that the amplifier offset is not modulated by the DAC IOUT terminal impedance change. External op amps with large offset voltages can produce INL errors in the transfer function of the DAC8811 due to offset modulation versus DAC code. For best linearity performance of the DAC8811, an op amp (OPA277) is recommended (Figure 18). This circuit allows VREF swinging from -10 V to +10 V. Figure 18. Voltage Output Configuration 8 Submit Documentation Feedback |
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