Datasheet

Host Processor Operation
3-4
Table 3-4.Capacitive Load Drive Output Jumper Settings
Reference Jumper Position Function
W3 2-3 Negative rail of the op amp tied to analog GND
W4 1-2 Positive rail supply of the op amp tied to 15 V
W5 3-4 Capacitive load drive output of DAC is channeled to the output terminals
W6 Open Disconnect V
REF(H)
from negative input of op amp
W7 Open Disconnect R8 (see Note)
Note: If there is a need to incrementally adjust the capacitive load output, replace R8 with a capacitor with the desired capaci-
tance value and CLOSE W7.
3.2.4 Bipolar Operation Using the DAC8541 (Default Mode)
Although the DAC8541 is designed for single-supply operation, the bipolar
output of operation is implemented using the circuit shown in Figure 3-1. The
output of the circuit gives an output voltage range of ±V
REF(H)
. The rail-to-rail
operation at the amplifier output is achievable using an OPA627 as the output
amplifier.
Figure 3-1. Bipolar Operation With the DAC8541
_
+
OPA627
15 V
-15 V
R2
10 kΩ
V
OUT
SENSE
V
OUT
DAC8541V
REF
H
V
REF
L
±5 V
R1
10 kΩ
0.1 µF10 µF
V
REF
U2
U1
The bipolar configuration is accomplished by following the correct jumper
settings according to Table 3-5.
Table 3-5.Bipolar Operation Output Jumper Settings
Reference Jumper Position Function
W3 1-2 Negative rail supply of the op amp tied to -15 V
W4 1-2 Positive rail supply of the op amp tied to 15 V
W5 Close Bipolar output of DAC is channeled to the output terminals
W6 Close Connect V
REF(H)
to the negative input of op amp for negative biasing
W7 Open Disconnect R8
An example in Figure 3-2 shows the sinusoidal signal in channel 1 being
amplified within the range of ±V
REF(H)
shown in channel 2. The reference
voltage, V
REF(H)
, is set to 5 V, which is then supplied to the negative input of
U2 to bias the circuit to its negative rail. This provides an output of ±5 V with