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AD7845KP Datenblatt(PDF) 7 Page - Analog Devices |
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AD7845KP Datenblatt(HTML) 7 Page - Analog Devices |
7 / 12 page AD7845 REV. B –7– UNIPOLAR BINARY OPERATION Figure 13 shows the AD7845 connected for unipolar binary operation. When VIN is an ac signal, the circuit performs 2-quadrant multiplication. The code table for Figure 13 is given in Table I. Figure 13. Unipolar Binary Operation Table I. Unipolar Binary Code Table for AD7845 Binary Number In DAC Register Analog Output, VOUT MSB LSB 1111 1111 1111 –VIN 4095 4096 1000 0000 0000 –VIN 2048 4096 = –1/2 VIN 0000 0000 0001 –VIN 1 4096 0000 0000 0000 0 V OFFSET AND GAIN ADJUSTMENT FOR FIGURE 13 Zero Offset Adjustment 1. Load DAC with all 0s. 2. Trim R3 until VOUT = 0 V. Gain Adjustment 1. Load DAC with all 1s. 2. Trim R1 so that VOUT = –VIN 4095 4096 . In fixed reference applications, full scale can also be adjusted by omitting R1 and R2 and trimming the reference voltage magni- tude. For high temperature applications, resistors and potenti- ometers should have a low temperature coefficient. BIPOLAR OPERATION (4-QUADRANT MULTIPLICATION) The recommended circuit for bipolar operation is shown in Figure 14. Offset binary coding is used. The offset specification of this circuit is determined by the matching of internal resistors RB and RC and by the zero code offset error of the device. Gain error may be adjusted by varying the ratio of R1 and R2. To use this circuit without trimming and keep within the gain error specifications, resistors R1 and R2 should be ratio matched to 0.01%. The code table for Figure 14 is given in Table II. Figure 14. Bipolar Offset Binary Operation Table II. Bipolar Code Table for Offset Binary Circuit of Figure 14 Binary Number In DAC Register Analog Output, VOUT MSB LSB 1111 1111 1111 +VIN 2047 2048 1000 0000 0001 +VIN 1 2048 1000 0000 0000 0 V 0111 1111 1111 –VIN 1 2048 0000 0000 0000 –VIN 2048 2048 = –VIN |
Ähnliche Teilenummer - AD7845KP |
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Ähnliche Beschreibung - AD7845KP |
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