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TLV5625IDRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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TLV5625IDRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 15 page TLV5625 2.7V TO 5.5V LOW POWER DUAL 8BIT DIGITALTOANALOG CONVERTER WITH POWER DOWN SLAS233D − JULY 1999 − REVISED JULY 2002 10 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION general function The TLV5625 is a dual 8-bit, single-supply DAC, based on a resistor-string architecture. It consists of a serial interface, a speed and power-down control logic, a resistor string, and a rail-to-rail output buffer. The output voltage (full scale determined by the reference) is given by: 2REF CODE 2n [V] Where REF is the reference voltage and CODE is the digital input value within the range of 010 to 2n−1, where n=8 (bits). The 16-bit data word, consisting of control bits and the new DAC value, is illustrated in the data format section. A power-on reset initially resets the internal latches to a defined state (all bits zero). serial interface A falling edge of CS starts shifting the data bit-per-bit (starting with the MSB) to the internal register on the falling edges of SCLK. After 16 bits have been transferred or CS rises, the content of the shift register is moved to the target latches (DAC A, DAC B, BUFFER, CONTROL), depending on the control bits within the data word. Figure 2 shows examples of how to connect the TLV5625 to TMS320, SPI , and Microwire. TMS320 DSP FSX CLKX DX TLV5625 SCLK DIN CS SPI I/O SCK MOSI TLV5625 SCLK DIN CS Microwire I/O SK SO TLV5625 SCLK DIN CS Figure 12. Three-Wire Interface Notes on SPI and Microwire: Before the controller starts the data transfer, the software has to generate a falling edge on the pin connected to CS. If the word width is 8 bits (SPI and Microwire) two write operations must be performed to program the TLV5625. After the write operation(s), the holding registers or the control register are updated automatically on the 16th positive clock edge. serial clock frequency and update rate The maximum serial clock frequency is given by: f sclkmax + 1 t whmin ) twlmin + 20 MHz The maximum update rate is: f updatemax + 1 16 t whmin ) twlmin + 1.25 MHz Note that the maximum update rate is just a theoretical value for the serial interface, as the settling time of the TLV5625 should also be considered. |
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