TLC7524C_08 Datasheet, PDF (5/21 Pages) Texas Instruments – 8-BIT MULTIPLYING DIGITAL-TO-ANALOG CONVERTERS

TLC7524C, TLC7524E, TLC7524I
8ĆBIT MULTIPLYING DIGITALĆTOĆANALOG CONVERTERS
SLAS061D − SEPTEMBER 1986 − REVISED JUNE 2007
PRINCIPLES OF OPERATION
voltage-mode operation
It is possible to operate the current-multiplying DAC in 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 1 is an example of a current-multiplying DAC, which is operated in voltage
mode.
R
R
R
REF (Analog Output Voltage)
2R
2R
2R
2R
0
1
R
OUT1 (Fixed Input Voltage)
OUT2
Figure 1. Voltage Mode Operation
The relationship between the fixed-input voltage and the analog-output voltage is given by the following
equation:
where
V_O = V_I (D/256)
V_O = analog output voltage
V_I = fixed input voltage
D = digital input code converted to decimal
In voltage-mode operation, these devices meet the following specification:
PARAMETER
Linearity error at REF
TEST CONDITIONS
VDD = 5V, OUT1 = 2.5V, OUT2 at GND, TA = +25°C
MIN MAX UNIT
1 LSB
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