TLC5618 Datasheet, PDF (14/26 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
general function
The TLC5618 uses a resistor string network buffered with an op amp to convert 12-bit digital data to analog
voltage levels (see functional block diagram and Figure 18). The output is the same polarity as the reference
input (see Table 1).
ǒ Ǔ _{The output code is given by:}
2
V_REFIN
CODE
4096
An internal circuit resets the DAC register to all 0s on power up.
+
_
REFIN
DIN
CS
SCLK
Resistor
String
DAC
+ ^×2
_
R
R
OUT
AGND
VDD
5V
0.1 µF
Figure 18. TLC5618 Typical Circuit
Table 1. Binary Code Table (0 V to 2 V_REFIN Output)_, Gain = 2
1111
1000
1000
0111
0000
INPUT
1111
:
0000
0000
1111
:
0000
1111
0001
0000
1111
0001
ǒ Ǔ^OUTPUT
2 VREFIN
4095
4096
:
ǒ Ǔ ₂
VREFIN
2049
4096
ǒ Ǔ _{+ 2}
VREFIN
2048
4096
VREFIN
ǒ Ǔ ₂
VREFIN
2047
4096
ǒ Ǔ^:
2 VREFIN
1
4096
0000
0000
0000
0V
14
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265