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TLC7226MFKB Datasheet(PDF) 7 Page - Texas Instruments |
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TLC7226MFKB Datasheet(HTML) 7 Page - Texas Instruments |
7 / 21 page TLC7226C, TLC7226I, TLC7226M QUADRUPLE 8BIT DIGITALTOANALOG CONVERTERS SLAS060F − JANUARY 1995 − REVISED APRIL 2009 7 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PRINCIPLES OF OPERATION AGND bias for direct bipolar output operation The TLC7226 can be used in bipolar operation without adding more external operational amplifiers as shown in Figure 4 by biasing AGND to VSS. This configuration provides an excellent method for providing a direct bipolar output with no additional components. The transfer values are shown in Table 1. _ + DAC A AGND DGND TLC7226‡ REF (Vref = 5 V) OUT 4 18 2 6 3 VDD 5 VSS −5 V Output range (5 V to − 5 V) ‡ Digital inputs omitted for clarity. Figure 4. AGND Bias for Direct Bipolar Operation LSB MSB DAC LATCH CONTENTS ANALOG OUTPUT ) V ref 127 128 1111 1111 ) V ref 1 128 1000 0001 1000 0000 –V ref 128 128 +* V ref 0111 1111 0000 0001 * V ref 127 128 0000 0000 0 V Table 1. Bipolar (Offset Binary) Code * V ref 1 128 AGND bias for positive output offset The TLC7226 AGND terminal can be biased above or below the system ground terminal, DGND, to provide an offset analog output voltage level. Figure 5 shows a circuit configuration to achieve this for channel A of the TLC7226. The output voltage, VO, at OUTA can be expressed as: V O + V BIAS ) D A V I where DA is a fractional representation of the digital input word (0 ≤ D ≤ 255/256). (1) Increasing AGND above system GND reduces the output range. VDD − Vref must be at least 4 V to ensure specified operation. Since the AGND terminal is common to all four DACs, this method biases up the output voltages of all the DACs in the TLC7226. Supply voltages VDD and VSS for the TLC7226 should be referenced to DGND. |
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