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DAC716P Fiches technique(PDF) 9 Page - Burr-Brown (TI) |
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DAC716P Fiches technique(HTML) 9 Page - Burr-Brown (TI) |
9 / 13 page 9 ® DAC716 Using D/A Converters The GAIN ADJUST and OFFSET ADJUST circuits of DAC716 have been arranged so that these points may be easily driven by external D/A converters. Refer to Figure 7. 12-bit D/A converters provide a nominal OFFSET adjust and GAIN adjust resolution of 25 µV and 15 µV per LSB step, respectively. Nominal values of GAIN and OFFSET occur when the D/A converters outputs are at approximately half scale, 0V. OUTPUT VOLTAGE RANGE CONNECTIONS The DAC716 output amplifier is connected internally for 10V output range. DIGITAL INTERFACE SERIAL INTERFACE The DAC716 has a serial interface with two data buffers which can be used for either synchronous or asynchronous updating of multiple D/A converters. A0 is the enable control for the Data Input Latch. A1 is the enable for the D/A Latch. CLK is used to strobe data into the latches enabled by A0 and A1. A CLR function is also provided and when enabled it sets both the Data Latch and the D/A Latch to all zeros . Multiple DAC716s can be connected to the same CLK and data lines in two ways. The output of the serial loaded data latch is available as SDO so that any number of DAC716s can be cascaded on the same input bit stream as shown in Figure 8 and 9. This configuration allows all D/A converters to be updated simultaneously and requires a minimum num- ber of control signal inputs. These configurations do require 16N CLK cycles to load any given D/A converter, where N is the number of D/A converters. The DAC716 can also be connected in parallel as shown in Figure 10. This configuration allows any D/A converter in the system to be updated in a maximum of 16 CLK cycles. FIGURE 5. System Ground Considerations for High-Resolution D/A Converters. R 1 Sense Output R L R 2 R 3 Alternate Ground Sense Connection System Ground ACOM DCOM Bus Interface DAC716 Analog Power Supply 0.01µF (1) 0.01µF To +V CC To –V CC NOTE: (1) Locate close to DAC716 package. V OUT 5k Ω 9.75k Ω V REF V REF OUT Offset Adjust SDI A 0 A 1 CLR |
Numéro de pièce similaire - DAC716P |
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Description similaire - DAC716P |
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