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DAC667JP 数据表(PDF) 5 Page - Burr-Brown (TI) |
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DAC667JP 数据表(HTML) 5 Page - Burr-Brown (TI) |
5 / 9 page 5 ® DAC667 zero analog output and all ones (FFFHEX) gives an analog output 1LSB below full scale. Input coding for bipolar analog outputs is bipolar offset binary (BOB), where an input code of 000HEX gives a minus full-scale output, an input of FFFHEX gives an output 1LSB below positive full scale, and zero occurs for an input code of 800HEX. The DAC667 can be used with two’s complement coding if a logic inverter is used ahead of the MSB input (DB11). INTERNAL/EXTERNAL REFERENCE USE DAC667 contains a +10V reference which is trimmed to typically ±0.2% and tested and guaranteed to ±1%. V REF OUT must be connected to VREF IN through a gain adjust resistor with a nominal value of 50 Ω. A trim potentiometer with a nominal value of 100 Ω can be used to provide adjustment to zero gain error. If an external 10.000V reference is used, it may be necessary to increase the trim range slightly. The reference output may be used to drive external loads, sourcing up to 5mA. The load current should be constant, otherwise the gain (and bipolar offset, if connected) of the converter will vary. It is possible to use references other than +10V. The recom- mended range of reference voltage is from +8V to +11V, which allows both 8.192V and 10.24V ranges to be used. The DAC667 is optimized for fixed-reference applications. If the reference voltage is expected to vary over a wide range, a CMOS multiplying D/A is a better choice. GAIN AND OFFSET ADJUSTMENTS Figures 2 and 3 illustrate the relationship of offset and gain adjustments to a unipolar- and a bipolar-connected DAC667. Offset should be adjusted first to avoid interaction of adjust- ments. FIGURE 2. Relationship of Offset and Gain Adjustments for a Unipolar D/A Converter. + Full Scale All Bits Logic 0 1LSB Range of Offset Adj. Offset Adjust Translates the Line Digital Input All Bits Logic 1 Range of Gain Adj. Gain Adjust Rotates the Line ≈ ±0.4% ≈ ±1% + Full Scale All Bits Logic 0 1LSB Range of Offset Adjust Offset Adj. Translates the Line Digital Input All Bits Logic 1 Full Scale Range Gain Adjust Rotates the Line – Full Scale MSB on All Others Off Bipolar Offset Range of Gain Adj. ≈ ±1% ≈ ±0.4% Gain Adjustment For either unipolar or bipolar operation, apply the digital input that gives the maximum positive voltage output. Ad- just the gain potentiometer for this positive full scale volt- age. See Table II for calibration values. SETTLING TIME PERFORMANCE The switches, reference and output amplifier of the DAC667 are designed for optimum settling time performance (Figure 4). Figure 4a shows the full scale range step response, VOUT –10V to +10V to –10V, for data input 000 HEX to FFFHEX to 000HEX. Figure 4b shows the settling time response at plus full scale (+10V) for an output transition from –10V to +10V. Figure 4c shows the settling time response at minus Offset Adjustment For unipolar (USB) operation, apply the digital input code that should produce zero voltage output and adjust the offset potentiometer for zero output. For bipolar (BOB, BTC) operation, apply the digital input code that produces the maximum negative output voltage and adjust the offset potentiometer for minus full scale voltage. See Table II for calibration values and codes. ANALOG OUTPUT 0 to +5V 0 to +10V ±2.5V ±5V ±10V FFFHEX +4.9987V +9.9976V +2.4987V +4.9976V +9.9951V 800HEX +2.5000V +5.0000V 0.0000V 0.0000V 0.0000V 7FFHEX +2.4987V +4.9976V –0.0013V –0.0024V –0.0049V 000HEX 0.0000V 0.0000V –2.5000V –5.0000V –10.0000V 1LSB 1.22mV 2.44mV 1.22mV 2.44mV 4.88mV DIGITAL INPUT TABLE II. Calibration Values. FIGURE 3. Relationship of Offset and Gain Adjustments for a Bipolar D/A Converter. |
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类似说明 - DAC667JP |
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