Datasheet

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APPLICATION INFORMATION
V
OUT


D
8192
1

 V
REF
(2)
Digital interface connections omitted for clarity.
A1
OPA277
A2
OPA277
10 kW
10 kW
5 kW
10 V
V
REF
V
OUT
-10 V < V
OUT
< +10 V
V
REF
X
A
GND
F
A
GND
X
I
OUT
X
R
FB
X
V
DD
One Channel
DAC8803
Cross-Reference
DAC8803
SBAS340C – JANUARY 2005 – REVISED FEBRUARY 2006
The DAC8803, a 2-quadrant multiplying DAC, can be used to generate a unipolar output. The polarity of the
full-scale output I
OUT
is the inverse of the input reference voltage at V
REF
.
Some applications require full 4-quadrant multiplying capabilities or bipolar output swing, as shown in Figure 63 .
An additional external op amp A2 is added as a summing amp. In this circuit the first and second amps (A1 and
A2) provide a gain of 2X that widens the output span to 20 V. A 4-quadrant multiplying circuit is implemented by
using a 10-V offset of the reference voltage to bias A2. According to the following circuit transfer equation
(Equation 2 ), input data (D) from code 0 to full scale produces output voltages of V
OUT
= -10 V to V
OUT
= 10 V.
Figure 63. Four-Quadrant Multiplying Application Circuit
The DAC8803 has an industry-standard pinout. Table 4 provides the cross-reference information.
Table 4. Cross-Reference
SPECIFIED
TEMPERATURE PACKAGE PACKAGE CROSS-
PRODUCT INL (LSB) DNL (LSB) RANGE DESCRIPTION OPTION REFERENCE PART
DAC8803IDB ±1 ±1 -40°C to +85°C 28-Lead MicroSOIC SSOP-28 AD5554BRS
21
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