Datasheet

  
   
SLAS061D − SEPTEMBER 1986 − REVISED JUNE 2007
5
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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
10
REF (Analog Output Voltage)
OUT2
OUT1 (Fixed Input Voltage)
R
RR
2R
2R2R2R
Figure 1. Voltage Mode Operation
The relationship between the fixed-input voltage and the analog-output voltage is given by the following
equation:
V
O
= V
I
(D/256)
where
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 TEST CONDITIONS MIN MAX UNIT
Linearity error at REF V
DD
= 5V, OUT1 = 2.5V, OUT2 at GND, T
A
= +25°C 1 LSB