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TLC7226CDWR Datasheet(PDF) 11 Page - Texas Instruments |
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TLC7226CDWR Datasheet(HTML) 11 Page - Texas Instruments |
11 / 21 page TLC7226C, TLC7226I, TLC7226M QUADRUPLE 8BIT DIGITALTOANALOG CONVERTERS SLAS060F − JANUARY 1995 − REVISED APRIL 2009 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION bipolar output operation using external amplifier Each of the DACs of the TLC7226 can also be individually configured to provide bipolar output operation, using an external amplifier and two resistors per channel. Figure 9 shows a circuit used to implement offset binary coding (bipolar operation) with DAC A of the TLC7226. In this case: V O + 1 ) R2 R1 D A V ref * R2 R1 V ref with R1 + R2 V O + 2D A * 1 V ref where D A is a fractional representation of the digital word in latch A. (2) Mismatch between R1 and R2 causes gain and offset errors. Therefore, these resistors must match and track over temperature. The TLC7226 can be operated with a single power supply or from positive and negative power supplies. 15 V _ + DAC A TLC7226 2 4 R2† R1† VO REF † R1 = R2 = 10 kΩ ±0.1% _ + − 15 V Figure 9. Bipolar Output Circuit staircase window comparator In many test systems, it is important to be able to determine whether some parameter lies within defined limits. The staircase window comparator shown in Figure 10 is a circuit that can be used to measure the VOH and VOL thresholds of a TTL device under test. Upper and lower limits on both VOH and VOL can be programmed using the TLC7226. Each adjacent pair of comparators forms a window of programmable size (see Figure 11). When the test voltage (Vtest) is within a window, then the output for that window is higher. With a reference of 2.56 V applied to the REF input, the minimum window size is 10 mV. |
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