TLC5618 Datasheet, PDF (19/26 Pages) Texas Instruments – PROGRAMMABLE DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTERS

TLC5618, TLC5618A
PROGRAMMABLE DUAL 12-BIT DIGITAL-TO-ANALOG CONVERTERS
SLAS156E – JULY 1997 – REVISED SEPTEMBER 1999
APPLICATION INFORMATION
VCC
Analog
Output
Analog
Output
To Source
Ground
CS
OUT A
TLC5618A
OUT B SCLK
DIN
GND
REFIN
FSR
FSX
TMS320C203
CLKX
DSP
CLKR
DX
2.5 V dc
Figure 23. Interfacing The TLC5618A to the TMS320C203 DSP
general serial interface
Both the TLC5618 and TLC5618A are compatible with SPI, QSPI, or Microwire serial standards. The hardware
connections are shown in Figures 24 and 25. The TLC5618A has an internal state machine that will count 16
clocks after the falling edge of CS and then internally disable the device. The internal edge is ORed together
with CS so that the rising edge can be provided to CS prior to the occurrence of the internal edge to also disable
the device.
The SPI and Microwire interfaces transfer data in 8-bit bytes, therefore, two write cycles are required to input
data to the DAC. The QSPI interface, which has a variable input data length from 8 to 16 bits, can load the DAC
input register in one write cycle.
SCLK
DIN
TLC5618,
TLC5618A
CS
SK
SO Microwire
Port
I/O
Figure 24. Microwire Connection
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
19