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DAC8801IDRBR Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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DAC8801IDRBR Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 16 page www.ti.com APPLICATION INFORMATION Stability Circuit _ + VDD RFB IOUT GND U1 VDD VREF VOUT C1 U2 VREF Positive Voltage Output Circuit GND OPA277 −2.5 V GND 0 3 VOUT 3 +2.5 V VOUT IOUT OPA277 C1 RFB DAC8801 VDD VDD +2.5V Reference VIN VOUT VREF − + − + DAC8801 SLAS403A – NOVEMBER 2004 – REVISED DECEMBER 2004 For a current-to-voltage design as shown in Figure 20, the DAC8801 current output (IOUT) and the connection with the inverting node of the op amp should be as short as possible and according to correct PCB layout design. For each code change there is a step function. If the GBP of the op amp is limited and parasitic capacitance is excessive at the inverting node then gain peaking is possible. Therefore, for circuit stability, a compensation capacitor C1 (4 pF to 20 pF typ) can be added to the design as shown in Figure 20. Figure 20. Gain Peaking Prevention Circuit With Compensation Capacitor As shown in Figure 21, in order to generate a positive voltage output, a negative reference is input to the DAC8801. This design is suggested instead of using an inverting amp to invert the output due to tolerance errors of the resistor. For a negative reference, VOUT and GND of the reference are level-shifted to a virtual ground and a -2.5 V input to the DAC8801 with an op amp. Figure 21. Positive Voltage Output Circuit 10 |
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