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DAC701CH Fiches technique(PDF) 9 Page - Burr-Brown (TI) |
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DAC701CH Fiches technique(HTML) 9 Page - Burr-Brown (TI) |
9 / 12 page 9 ® DAC701, 702, 703 VOLTAGE OUTPUT MODELS ANALOG OUTPUT DAC701 UNIPOLAR DAC703 BIPOLAR DIGITAL INPUT CODE 16-BIT 15-BIT 14-BIT 16-BIT 15-BIT 14-BIT 1LSB ( µV) 153 305 610 305 610 1224 0000H (V) +9.99985 +9.99969 +9.99939 +9.99960 +9.99939 +9.99878 FFFFH (V) 0 0 0 –10.0000 –10.0000 –10.0000 ANALOG OUTPUT MODEL ANALOG OUTPUT DAC702 BIPOLAR DIGITAL INPUT CODE 16-BIT 15-BIT 14-BIT 1LSB ( µA) 0.031 0.061 0.122 0000H (mA) –0.99997 –0.99994 –0.99988 FFFFH (mA) +1.00000 +1.00000 +1.00000 TABLE II. Digital Input and Analog Output Relationships. If the output cannot be sensed at Common or the system ground point as mentioned above, the differential output circuit shown in Figure 8 is recommended. In this circuit the output voltage is sensed at the load common and not at the D/A converter common as in the previous circuits. The value of R 6 and R7 must be adjusted for maximum common-mode rejection at RL. Note that if R3 is negligible, the circuit of Figure 8 can be reduced to the one shown in Figure 7. Again the effect of R4 is negligible. The D/A converter and the wiring to its connectors should be located to provide optimum isolation from sources of RFI and EMI. The key concept in elimination of RF radiation or pickup is loop area; therefore, signal leads and their return conductors should be kept close together. This reduces the external magnetic field along with any radiation. Also, if a single lead and its return conductor are wired close together, they present a small flux-capture cross section for any external field. This reduces radiation pickup in the circuit. FIGURE 7. Preferred External Op Amp Configuration. FIGURE 8. Differential Sensing Output Op Amp Configuration. A 1 R DAC DAC702 R B Common I OUT R 1 ‡ R L R 3 Sense Output +5VDC Supply ±15VDC Supply +V COM –V System Ground Point +V COM Alternate Ground Sense Connection R 4 To +V CC To –V CC To V DD 1µF 1µF 1µF * 2.45k R F * R 2 R should be equal to the output impedance at the current output to compensate for the bias current drift of A . Use standard 10%, 1/4W carbon composition or equivalent resistors. B 1 ‡ DAC702 Ω 2.45k 10k Ω Ω R DAC R B R F * R F A 1 R DAC DAC702 R 6 Common I OUT R 1 R L R 3 +5VDC Supply ±15VDC Supply +V COM –V System Ground Point +V COM Alternate Ground Sense Connection R 4 To +V CC To –V CC To V DD 1µF 1µF 1µF 2.45k R F * R 2 DAC702 Ω 10k Ω R DAC R F * R F R 5 R 7 Sense Output + 5 R 7 R= + F R 1 R R 6 = DAC R |
Numéro de pièce similaire - DAC701CH |
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Description similaire - DAC701CH |
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