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AD7521LN Arkusz danych(PDF) 5 Page - Renesas Technology Corp |
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AD7521LN Arkusz danych(HTML) 5 Page - Renesas Technology Corp |
5 / 10 page AD7520, AD7521 FN3104 Rev.4.00 Page 5 of 10 August 2002 Applications Unipolar Binary Operation The circuit configuration for operating the AD7520 in unipolar mode is shown in Figure 8. Similar circuits can be used for AD7521. With positive and negative VREF values the circuit is capable of 2-Quadrant multiplication. The Digital Input Code/Analog Output Value table for unipolar mode is given in Table 1. Zero Offset Adjustment 1. Connect all digital inputs to GND. 2. Adjust the offset zero adjust trimpot of the output operational amplifier for 0V at VOUT. Gain Adjustment 1. Connect all digital inputs to V+. 2. Monitor VOUT for a -VREF (1-2-N) reading. (N = 8 for AD7520 and N = 10 for AD7521). FIGURE 4. NOISE FIGURE 5. OUTPUT CAPACITANCE FIGURE 6. FEEDTHROUGH ERROR FIGURE 7. OUTPUT CURRENT SETTLING TIME Test Circuits The following test circuits apply for the AD7520. Similar circuits are used for the AD7521. (Continued) 15 2 5 4 13 3 1 AD7520 101ALN - + 0.1 F IOUT1 IOUT2 14 10k VOUT 100 15 F 1K +15V 50k 1k -50V f = 1kHz BW = 1Hz QUAN TECH MODEL 134D WAVE ANALYZER +11V (ADJUST FOR VOUT = 0V) 15 16 1 5 4 13 3 2 AD7520 BIT 1 (MSB) BIT 10 (LSB) 14 +15V NC SCOPE 100mVP-P 1MHz NC 1k +15V 15 16 1 5 4 13 3 2 AD7520 BIT 1 (MSB) BIT 10 (LSB) 14 +15V VREF = 20VP-P GND IOUT1 IOUT2 2 3 6 VOUT 100kHz SINE WAVE HA2600 - + 15 1 5 4 13 3 2 AD7520 BIT 1 (MSB) BIT 10 (LSB) 14 +15V SCOPE +100mV 100 GND VREF DIGITAL IOUT2 EXTRAPOLATE 5t: 1% SETTLING (1mV) 8t: 0.03% SETTLING t = RISE TIME INPUT +5V 0V +10V 15 16 1 5 4 13 3 2 AD7520 BIT 1 (MSB) BIT 10 (LSB) 14 +15V VREF GND IOUT1 IOUT2 6 VOUT - + RFEEDBACK DIGITAL INPUT FIGURE 8. UNIPOLAR BINARY OPERATION (2-QUADRANT MULTIPLICATION) TABLE 1. CODE TABLE - UNlPOLAR BINARY OPERATION DIGITAL INPUT ANALOG OUTPUT 1111111111 -VREF (1-2-N) 1000000001 -VREF (1/2 + 2-N) 1000000000 -VREF/2 0111111111 -VREF (1/2-2-N) 0000000001 -VREF (2-N) 0000000000 0 NOTES: 1. LSB = 2-N VREF. 2. N = 8 for 7520 N = 10 for 7521. |
Podobny numer części - AD7521LN |
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Podobny opis - AD7521LN |
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