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TLV5617AIDR Datasheet(PDF) 10 Page - Texas Instruments

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Part # TLV5617AIDR
Description  2.7-V TO 5.5-V LOW-POWER DUAL 10-BIT DIGITAL-TO-ANALOG CONVERTER WITH POWER DOWN
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TLV5617AIDR Datasheet(HTML) 10 Page - Texas Instruments

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TLV5617A
2.7-V TO 5.5-V LOW-POWER DUAL 10-BIT DIGITAL-TO-ANALOG
CONVERTER WITH POWER DOWN
SLAS234F – JULY 1999 – REVISED JULY 2002
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
general function
The TLV5617A is a dual 10-bit, single-supply DAC, based on a resistor-string architecture. It consists of a serial
interface, 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=10 (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 12 shows examples of how to connect the TLV5617A to TMS320, SPI, and Microwire.
TMS320
DSP FSX
CLKX
DX
TLV5617A
SCLK
DIN
CS
SPI
I/O
SCK
MOSI
TLV5617A
SCLK
DIN
CS
Microwire
I/O
SK
SO
TLV5617A
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 TLV5617A. After the write operation(s), the holding registers or the control register
of the DAC update automatically on the rising CS edge, ending the write cycle to the DAC. Note: After transfer
of the LSB during a data or control write cycle, one additional rising edge on SCLK is required to reset the internal
state machine. This edge can occur when CS is high or low, but must occur before the next falling CS edge that
begins the following write cycle. Refer to the timing diagram for more information.
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
TLV5617A should also be considered.


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