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DAC729 Datasheet(PDF) 7 Page - Burr-Brown (TI) |
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DAC729 Datasheet(HTML) 7 Page - Burr-Brown (TI) |
7 / 12 page DAC729 7 common to shunt noise pickup. This capacitor should be a low leakage film type (such as Mylar™ or Teflon™). Refer to Figures 5 and 6 for relationship of offset and gain adjustments to unipolar and bipolar D/A converters. 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) configurations, apply the digital input code that should produce the maximum negative output voltage. See Table II for corresponding codes and Figures 2 and 3 for offset adjustment connections. Offset adjust should be made prior to gain adjust. GAIN ADJUSTMENT For either unipolar or bipolar configurations, apply the digital input that should give the maximum positive output voltage. Adjust the gain potentiometer for this positive full- scale voltage. See Table II for positive full-scale voltages and Figure 3 for gain adjustment connections. OUTPUT CONNECT CONNECT CONNECT RANGE CODE PIN 23 PIN 31 PIN 24 16-BITS 18-BITS ±10V COB to Pin 25 to Pin 26 to Pin 29 9.9969V 9.99992V ±5V COB to Pin 27 to Pin 26 to Pin 29 4.9998V 9.99996V ±2.5V COB to Pin 27 to Pin 26 to Pins 2.4992V 2.49998V 29 & 25 0 to 10V CSB to Pins N/C to Pin 29 9.9998V 9.99996V 25 & 26 0 to 5V CSB to Pins N/C to Pin 29 4.9999V 4.99998V 27 & 28 GAIN ADJUST TABLE II. Output Range Connections and Gain Adjust Voltage. Mylar™, Teflon™ E.I. du Pont de Nemours & Co. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 + 1µF + 1µF + 1µF –15V +15V +5V V LOGIC Analog Common Reference Common Digital Common 18-Bit DAC FIGURE 2. Ground Connections and Supply Bypass. –V CC Offset Adjust 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 –V CC = 15V +5V 0.0022µF 270k Ω +V CC = 15V NOTE: (1) Mylar ™ or Teflon™ Film. 3.9M –V CC Gain Adjust +V CC 10k Ω to 100k Ω 10k Ω to 100k Ω +V CC (1) FIGURE 3. Gain and Offset Adjust Hook-Up. |
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