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LTC1590 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1590 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LTC1590 TIMING DIAGRAMS D11 A MSB D10 A D9 A D1 B t1 t6 D0 B LSB t2 t4 t3 t 9 CLK DIN DOUT CS/LD t5 1590 TD02 D11 A PREVIOUS WORD D10 A PREVIOUS WORD D0 B PREVIOUS WORD D11 A CURRENT WORD D9 A PREVIOUS WORD t8 t7 12 3 23 24 TIMING DIAGRAM APPLICATIONS INFORMATION Description The LTC1590 is a dual 12-bit multiplying DAC that has serial inputs and current outputs. It uses precision R/2R resistor ladder technology to provide exceptional linearity and stability. The device operates from a single 5V supply and provides a ±10V reference input and voltage output range when used with an external op amp. Serial I/O The LTC1590 has a 3-wire SPI/MICROWIRE TM compatible serial port that accepts 24-bit serial words. Data is loaded MSB first with the first 12 bits controlling DAC A and the second 12 bits controlling DAC B. Data is shifted into the DIN input on the rising edge of CLK. The CS/LD input must be taken low before transferring data to enable the CLK input. After transferring data, CS/LD is pulled high to load data from the shift register to the DAC registers which updates both DACs. The buffered output of the 24-bit shift register is available on the DOUT pin. Multiple DACs can be daisy-chained on one 3-wire interface by connecting the DOUT pin to the DIN pin of the next DAC (see the Timing Diagrams section). MICROWIRE is a trademark of National Semiconductor Corporation. R R RO VREF A VREF B RFB A RFB B OUT1 A OUT1 B OUT2 A OUT2 B AGND 1590 F01 ILKG COUT CODE 4096 VREF R ()( ) Equivalent Circuit Figure 1 shows an equivalent analog circuit for the LTC1590 DACs. R is the reference input, RREF, which is nominally 11k. The DAC output is represented by the Thevinin equivalent current source with a value of: (Code/4096)(VREF/R) The current source ILKG models the junction leakage of the DAC output switches. ILKG is typically less than 5nA at 85 °C and decreases by roughly two times for every 10°C reduction in temperature. COUT is the output capacitance, and it also comes from the DAC output switches and varies from 30pF at zero scale to 60pF at full scale. RO is the equivalent output resistance, which varies with digital input code (see Op Amp Selection section). Figure 1. Equivalent Circuit |
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Similar Description - LTC1590_15 |
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