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DAC714HB Datasheet(PDF) 9 Page - Texas Instruments |
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DAC714HB Datasheet(HTML) 9 Page - Texas Instruments |
9 / 22 page DAC714 9 SBAS032A www.ti.com DIGITAL INTERFACE SERIAL INTERFACE The DAC714 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 input shift register. 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 the shift register and the D/A Latch to 0000H (output voltage is midscale). Multiple DAC714s can be connected to the same CLK and data lines in two ways. The output of the serial shift register is available as SDO so that any number of DAC714s can be cascaded on the same input bit stream as shown in Figures 8 and 9. This configuration allows all D/A converters to be updated simultaneously and requires a minimum number of control signals. These configurations do require 16N CLK cycles to load any given D/A converter, where N is the number of D/A converters. The DAC714 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. GAIN AND OFFSET ADJUST Connections Using Potentiometers GAIN and OFFSET adjust pins provide for trim using external potentiometers. 15-turn potentiometers provide suf- ficient resolution. Range of adjustment of these trims is at least ±0.3% of Full Scale Range. Refer to Figure 6. Using D/A Converters The GAIN ADJUST and OFFSET ADJUST circuits of the DAC714 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 an OFFSET adjust resolution and a GAIN adjust resolution of 30 µV to 50 µV per LSB step. Nominal values of GAIN and OFFSET occur when the D/A converters outputs are at approximately half scale, +5V. OUTPUT VOLTAGE RANGE CONNECTIONS The DAC714 output amplifier is connected internally to provide a 20V output range. For other ranges and configu- rations, see Figures 6 and 7. 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 DAC714 Analog Power Supply 0.01µF (1) 0.01µF To +V CC To –V CC NOTE: (1) Locate close to DAC714 package. V OUT 10k Ω 10k Ω V REF V REF R BPO SDI A 0 A 1 CLR 10k Ω R FB2 |
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