TLC7528C, TLC7528E, TLC7528I
DUAL 8-BIT MULTIPLYING
DIGITAL-TO-ANALOG CONVERTERS
SLAS062B – JANUARY 1987 – REVISED MARCH 2000
APPLICATION INFORMATION
voltage-mode operation
It is possible to operate the current multiplying D/A converter of these devices in a voltage mode. In the voltage
mode, a fixed voltage is placed on the current output terminal. The analog output voltage is then available at
the reference voltage terminal. Figure 11 is an example of a current multiplying D/A, that operates in the voltage
mode.
R
REF
(Analog Output Voltage)
2R
2R
2R
2R
R
R
“0”
“1”
R
Out (Fixed Input Voltage)
AGND
Figure 11. Voltage-Mode Operation
The following equation shows the relationship between the fixed input voltage and the analog output voltage:
V
O
= V
I
(D/256)
Where:
V
O
= analog output voltage
V
I
= fixed input voltage (must not be forced below 0 V.)
D = digital input code converted to decimal
In voltage-mode operation, these devices meet the following specification:
PARAMETER
Linearity error at REFA or REFB
VDD = 5 V,
TEST CONDITIONS
OUTA or OUTB at 2.5 V,
TA = 25°C
MIN
MAX
1
UNIT
LSB
14
POST OFFICE BOX 655303
•
DALLAS, TEXAS 75265
TI [ TEXAS INSTRUMENTS ]
