Datasheet

  
  
 
SLAS062E − JANUARY 1987 − REVISED NOVEMBER 2008
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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.
2R 2R 2R
“0” “1”
2R
RRR
R
Out (Fixed Input Voltage)
AGND
REF
(Analog Output Voltage)
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 TEST CONDITIONS MIN MAX UNIT
Linearity error at REFA or REFB V
DD
= 5V, OUTA or OUTB at 2.5V, T
A
= +25°C 1 LSB