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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)： | 14/16頁 |
| 文件大?。?/td> | 382K |
| 代理商： | X60250V8IZ |
14
FN8146.1
September 14, 2005
TYPICAL PERFORMANCE CHARACTERISTIC CURVES (Continued)
APPLICATIONS INFORMATION
Standard Reference configurations
Figure 8 shows the device connections to produce a 0
to 1.250V adjustable reference with 8 bits of resolution.
V
REFL
will be grounded in this case. Figure 9 has
device connections to produce a 0.625V to 1.250V
reference with 8 bits of resolution, with R
1
grounded.
This configuration effectively doubles the output voltage
control resolution, increasing the accuracy of the
desired reference output voltage. Since the auxiliary
resistor is matched to the DCP resistor, temperature
drift is minimized.
Figure 8. Standard Configuration
Figure 9. Using Auxilliary Resistor
Reducing Output Noise
The output noise voltage of the reference is typically
200μV rms in the 10kHz bandwidth. An advantage of the
adjustable reference configuration is the ease in filtering
this noise. Simply adding a capacitor to the V
OUT
pin will
produce a single pole filter with a corner frequency of:
R
DCP
will vary with tap position and wiper resistance. If
the approximate tap position of the DCP is known, it can
be used to calculate this resistance as follows:
For example, with V
CC
= 5V, tap # = 127 (corresponding
to V
OUT
= 0.623V), C
FILTER
= 0.1μF, using typical values:
Power On Settling Time
V
REFOUT
1.25V
Reference
100K
100K
V
REFL
GND
R
1
V
OUT
Adjusted
Reference
Voltage
0.0 to 1.25V Range
V
REFOUT
1.25V
Reference
100K
100K
V
REFL
GND
R
1
V
OUT
0.625V to 1.25V
Range
F
CORNER
1
2
--
π
×
R
DCP
C
FILTER
×
×
=
R
DCP
----------–
255
R
TOTAL
255
-------------
R
TOTAL
×
||
R
WIPER
+
×
=
#
#
R
DCP
25K
0.6K
+
25.6k
=
=
F
CORNER
62Hz
=
X60250
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