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DAC80-CBI-V Datasheet(PDF) 7 Page - Texas Instruments |
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DAC80-CBI-V Datasheet(HTML) 7 Page - Texas Instruments |
7 / 10 page 7 DAC80/80P ® Existing applications that are converting to the monolithic DAC80 must change the gain trim resistor on pin 23 from 33M Ω to 10MΩ to insure sufficient adjustment range. Pin 23 is a high impedance point and a 0.001 µ1F to 0.01µF ceramic capacitor should be connected from this pin to Common (pin 21) to prevent noise pickup. Refer to Figure 5 for relationship of Offset and Gain adjustments to unipolar and bipolar D/A operation. Unipolar Offset Adjustment For unipolar (CSB) configurations, apply the digital input code that should produce zero potential output and adjust the Offset potentiometer for zero output. For bipolar (COB, CTC) configurations, apply the digital input code that should produce the maximum negative output. Example: If the Full Scale Range is connected for 20V, the maximum negative output voltage is –10V. See Table II for corresponding codes. Gain Adjustment For either unipolar or bipolar configurations, apply the digital input that should give the maximum positive output. Adjust the Gain potentiometer for this positive full scale output. See Table II for positive full scale voltages and currents. Bipolar + Full Scale All Bits Logic 1 1LSB Range of Offset Adjust Offset Adjust Translates the Line Digital Input All Bits Logic 0 Range of Gain Adjust Gain Adjust Rotates the Line + Full Scale All Bits Logic 1 1LSB Range of Offset Adjust Offset Adjust Translates the Line Digital Input –Full Scale Range of Gain Adjust Gain Adjust Rotates the Line Full Scale Range Bipolar Offset MSB On, All Others Off All Bits Logic 0 FIGURE 5. Relationship of Offset and Gain Adjustments for a Unipolar and Bipolar D/A Converter. ANALOG OUTPUT DIGITAL INPUT VOLTAGE(1) CURRENT MSB LSB 0 to +10V ±10V 0 to –2mA ±1mA ↓↓ 000000000000 +9.9976V +9.9951V –1.9995mA –0.9995mA 011111111111 +5.0000V 0.0000V –1.0000mA 0.0000mA 100000000000 +4.9976V –0.0049V –0.9995mA +0.0005mA 111111111111 0.0000V –10.0000V 0.0000mA +1.000mA One LSB 2.44mV 4.88mV 0.488 µA 0.488 µA NOTE: (1) To obtain values for other binary ranges: 0 to +5V range divide 0 to +10V range values by 2. ±5V range: divide ±10V range values by 2. ±2.5V range: divide ±10V range values by 4. TABLE II. Digital Input/Analog Output. VOLTAGE OUTPUT MODELS Output Range Connections Internal scaling resistors provided in the DAC80 may be connected to produce bipolar output voltage ranges of ±10V, ±5V, or ±2.5V; or unipolar output voltage ranges of 0 to +5V or 0 to +10V. See Figure 6. Gain and offset drift are minimized because of the thermal tracking of the scaling resistors with other internal device components. Connections for various output voltage ranges are shown in Table III. Settling time for a full-scale range change is specified as 4 µs for the 20V range and 3µs for the 10V range. FIGURE 6. Output Amplifier Voltage Range Scaling Circuit. 6.3k Ω(1) 5k Ω(1) 5k Ω(1) 18 Summing Junction 20 Reference Input To Reference Control Circuit NOTE: (1) Resistor Tolerances: ±2% max. Common 19 15 21 17 Bipolar Offset Output From Weighted Resistor Network 16 10M Ω 270k Ω 270k Ω 7.8k Ω to 10kΩ 3.9M Ω 180k Ω 180k Ω 10k Ω FIGURE 4. Equivalent Resistances. |
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