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DAC80-CBI-V-BI Datasheet(PDF) 9 Page - Texas Instruments |
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DAC80-CBI-V-BI Datasheet(HTML) 9 Page - Texas Instruments |
9 / 10 page 9 DAC80/80P ® Driving a Resistive Load Unipolar A load resistance, R L = RLI + RLS, connected as shown in Figure 11 will generate a voltage range, V OUT, determined by: The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems. V OUT = –2mA [(RL x RO) ÷ (RL + RO)] The unipolar output impedance R O equals 6.6kΩ (typ) and R LI is the internal load resistance of 968 Ω (derived by connecting pin 15 to 20 and pin 18 to 19). By choosing R LS = 210 Ω, R L = 1178Ω. RL in parallel with RO yields 1kΩ total load. This gives an output range of 0 to –2V. Since R O is not exact, initial trimming per Figure 3 may be necessary; also R LS may be trimmed. Driving a Resistive Load Bipolar The equivalent output circuit for a bipolar output voltage range is shown in Figure 12, R L = R LI + R LS. V OUT is determined by: V OUT = ±1mA [(RO x RL) ÷ (RO + RL)] By connecting pin 17 to 15, the output current becomes bipolar ( ±1mA) and the output impedance R O becomes 3.2k Ω (6.6kΩ in parallel with 6.3kΩ). R LI is 1200Ω (derived by connecting pin 15 to 18 and pin 18 to 19). By choosing R LS = 225Ω, RL = 1455Ω. RL in parallel with RO yields 1kΩ total load. This gives an output range of ±1V. As indicated above, trimming may be necessary. FIGURE 12. Current Output Model Connected for Bipolar Output Voltage with Resistive Load. 21 15 +1mA V OUT – R LI R O Current Controlled by Digital Input + Common R LS 20 FIGURE 11. Current Output Model Equivalent Circuit Connected for Unipolar Voltage Output with Resistive Load. 21 15 0 to –2mA V OUT – R LI R O Current Controlled by Digital Input + Common R LS 18 |
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