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DAC703KP Fiches technique(PDF) 7 Page - Texas Instruments |
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DAC703KP Fiches technique(HTML) 7 Page - Texas Instruments |
7 / 11 page 7 ® DAC701, 702, 703 POWER SUPPLY SENSITIVITY Power supply sensitivity is a measure of the effect of a change in a power supply voltage on the D/A converter output. It is defined as a percent of FSR change in the output per percent of change in either the positive supply (+VCC), negative supply (–V CC) or logic supply (VDD) about the nominal power supply voltages (see Figure 2). It is specified for DC or low frequency changes. The typical performance curve in Figure 2 shows the effect of high frequency changes in power supply voltages. FIGURE 2. Power Supply Rejection vs Power Supply Ripple Frequency. Power Supply Ripple Frequency (Hz) 1 10 100 1k 10k 100k 0.030 0.025 0.020 0.015 0.01 0.005 0 –15V Supply +15V Supply +5V Supply REFERENCE SUPPLY All models have an internal low-noise +6.3V reference voltage derived from an on-chip buried zener diode. This reference voltage, available to the user, has a tolerance of ±5% (KH models) and ±1% (BH models). A minimum of 1.5mA is available for external loads. Since the output impedance of the reference output is typically 1W, the external load should remain constant. If a varying load is to be driven by the reference supply, an external buffer amplifier is recommended to drive the load in order to isolate the bipolar offset (connected internally to the reference) from load variations. OPERATING INSTRUCTIONS POWER SUPPLY CONNECTIONS For optimum performance and noise rejection, power sup- ply decoupling capacitors should be added as shown in the Connection Diagram. 1 µF tantalum capacitors should be located close to the D/A converter. EXTERNAL ZERO AND GAIN ADJUSTMENT Zero and gain may be trimmed by installing external zero and gain potentiometers. Connect these potentiometers as shown in the Connection Diagram and adjust as described below. TCR of the potentiometers should be 100ppm/ °C or less. The 3.9M Ω and 270kΩ resistors (±20% carbon or better) should be located close to the D/A converter to prevent noise pickup. If it is not convenient to use these high-value resistors, an equivalent “T” network, as shown in Figure 3, may be substituted in place of the 3.9M Ω part. A 0.001 µF to 0.01µF ceramic capacitor should be connected from Gain Adjust to Common to prevent noise pickup. Refer to Figures 4 and 5 for the relationship of zero and gain adjustments to unipolar and bipolar D/A converters. FIGURE 3. Equivalent Resistances. ≡ 180k Ω 180k Ω 3.9M Ω 10k Ω Digital Input H Input = 0000 H Input = FFFF Gain Adjust Rotates the Line Range of Gain Adjust 1LSB + Full Scale Range of Zero Adjust Zero Adjust Translates the Line FIGURE 4. Relationship of Zero and Gain Adjustments for Unipolar D/A Converters, DAC701. Digital Input H Input = FFFF Gain Adjust Rotates the Line Range of Gain Adjust 1LSB + Full Scale – Full Scale Range and Offset Adjust Offset Adjust Translates the Line H Input = 0000 MSB on All Others Off 7FFFH FIGURE 5. Relationship of Zero and Gain Adjustments for Bipolar D/A Converters, DAC702 and DAC703. |
Numéro de pièce similaire - DAC703KP |
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Description similaire - DAC703KP |
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