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參數(shù)資料
| 型號： | X60250V8IZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Micro Power Programmable Voltage Reference |
| 中文描述： | 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 1.25 V, PDSO8 |
| 封裝： | PLASTIC, TSSOP-8 |
| 文件頁數(shù)： | 15/16頁 |
| 文件大?。?/td> | 382K |
| 代理商： | X60250V8IZ |
15
FN8146.1
September 14, 2005
Since this is a single pole rolloff, the actual noise
bandwidth is 1.57 times this, or 97Hz. This should
reduce typical output noise to about 45μV rms. Note that
if the wiper is set to the highest tap positon (tap# = 255)
to give a V
OUT
of 1.25V, the resulting R
DCP
= R
WIPER
or
600
, and the filter bandwidth will now be 2.6kHz,
increasing noise significantly. If tap positions near
V
REFOUT
will be used, then a series resistor R
OUT
should
be added to better control noise bandwidth.
Figure 10. Reducing Output Noise
Higher Reference Voltages
If a reference voltage higher than 1.25V is required, then
an opamp can be added to amplify the V
OUT
voltage.
There are many micropower opamps available, such as
the LMV341, which can produce an output at very close
to either supply rail. Figure 11 shows a circuit for a 0V to
5.0V adjustable reference, which has 8 bits of control.
Note that if the auxiliary resistor is connected to ground
instead of V
REFL
, then the output voltage range will be
2.5V to 5.0V, but resolution will double. Total current
draw from that circuit will be 156μA (typically, with
V
OUT
= 5V) including reference and opamp circuitry.
Note that due to V
CC
supply variations, the output may
not span up to 5.00V which would result in missing codes
at the top end of the DCP range.
Figure 11. Increasing Reference Output Voltage
R
1
C
FILTER
R
OUT
(optional)
V
REFOUT
1.25V
Reference
100K
100K
V
REFL
GND
V
OUT
Filtered
Reference
Voltage
–
+
LMV341
R
1
+5V
0 to
5.0V
4
2
100K
33K
6
1
3
5
20K
C
FILTER
V
REFOUT
1.25V
Reference
100K
100K
V
REFL
GND
X60250
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