TLC7528CNSR Datasheet, PDF (14/27 Pages) Texas Instruments – DUAL 8-BI MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

TLC7528C, TLC7528E, TLC7528I
DUAL 8ĆBIT MULTIPLYING
DIGITALĆTOĆANALOG CONVERTERS
SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008
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.
REF
(Analog Output Voltage)
R
R
2R
R
2R
2R
2R
“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 0V.)
D = digital input code converted to decimal
In voltage-mode operation, these devices meet the following specification:
PARAMETER
Linearity error at REFA or REFB
TEST CONDITIONS
VDD = 5V, OUTA or OUTB at 2.5V, TA = +25°C
MIN MAX UNIT
1 LSB
14
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