Texas Instruments DAC8564EVM - DAC8564 Evaluation Module DAC8564EVM DAC8564EVM 데이터 시트
제품 코드
DAC8564EVM
3.4.1
Unity Gain Output
3.4.2
Output Gain of Two Operation
3.4.3
Bipolar Output Operation
EVM Operation
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The following sections describe the different configurations of the output amplifier, U2.
The buffered output configuration can be used to prevent loading the DAC8564/65 though it may present
some slight distortion because of the feedback resistor and capacitor. The user can tailor the feedback
circuit to closely match their desired wave shape by simply desoldering R8 and C12 and replacing it with
the desired values. You can also simply get rid of R8 and C12 altogether and just solder a zero ohm
resistor in replacement of R8, if desired and leave C12 unpopulated.
some slight distortion because of the feedback resistor and capacitor. The user can tailor the feedback
circuit to closely match their desired wave shape by simply desoldering R8 and C12 and replacing it with
the desired values. You can also simply get rid of R8 and C12 altogether and just solder a zero ohm
resistor in replacement of R8, if desired and leave C12 unpopulated.
shows the jumper setting for the unity gain configuration of the DAC external output buffer in
unipolar mode.
Table 4. Unity Gain Output Jumper Settings
Reference
Jumper
Function
Setting
JMP15
1-2
Connects DAC output (V
OUT
A) to the non-inverting input of the output operational amplifier, U2.
2-3
Connects DAC output (V
OUT
B) to the non-inverting input of the output operational amplifier, U2.
JMP5
OPEN
Disconnect V
REF
H from the inverting input of the operational amplifier, U2
JMP10
1-2
Connects the negative rail of the operational amplifier, U2, to AGND.
JMP6
OPEN
Disconnect negative input of the operational amplifier from the gain resistor, R9.
JMP16
1-2
Connects the output terminal of the operational amplifier, U2, to J4A-5 for monitoring the voltage
output.
output.
The configuration as described on
yields a gain of two output for a wider mode of voltage output
operation.
Table 5. Gain of Two Output Jumper Settings
Reference
Jumper
Function
Setting
JMP15
1-2
Connects DAC output (V
OUT
A) to the non-inverting input of the output operational amplifier, U2.
2-3
Connects DAC output (V
OUT
B) to the non-inverting input of the output operational amplifier, U2.
JMP5
OPEN
Disconnect V
REF
H from the inverting input of the operational amplifier, U2.
JMP10
1-2
Supplies power, V
SS
, to the negative rail of operational amplifier, U2, for wider range of operation.
JMP6
CLOSE
Connect the negative input of the operational amplifier, U2, to the gain resistor, R9.
JMP16
1-2
Connects the output terminal of the operational amplifier, U2, to J4A-5 for monitoring the voltage
output.
output.
Using the external V
REF
H to offset the DAC output and extend the range of operation to achieve a bipolar
mode of operation is possible by configuring the output operational amplifier, U2, properly. This
configuration is described in
configuration is described in
Table 6. Bipolar Output Operation Jumper Settings
Reference
Jumper
Function
Setting
JMP15
1-2
Connects DAC output (V
OUT
A) to the non-inverting input of the output operational amplifier, U2.
2-3
Connects DAC output (V
OUT
B) to the non-inverting input of the output operational amplifier, U2.
JMP5
CLOSE
Connect V
REF
H to the inverting input of the operational amplifier, U2.
JMP10
1-2
Supplies power, V
SS
, to the negative rail of operational amplifier, U2, for wider range of operation.
20
DAC8564/65 Evaluation Module
SLAU252 – June 2008