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參數(shù)資料
| 型號(hào)： | MAX872-MAX874 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 10レA, Low-Dropout, Precision Voltage References |
| 中文描述： | 10レ甲，低壓差，精密電壓基準(zhǔn) |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 112K |
| 代理商： | MAX872-MAX874 |
Applic ations Information
T rimming the Output V oltage
The MAX872/MAX874’s output voltage is trimmed for
0.2% tolerance at +25°C. If additional V
OUT
trimming is
desired, connect a potentiometer to TRIM, as shown in
Figures 1a and 1b. Adjusting V
OUT
away from its facto-
ry-trimmed voltage typically changes the output voltage
tempco by 7ppm/°C per 100mV.
Reduc ing Input Ripple with an Input Filter
The Power-Supply Rejection Ratio vs. Frequency graph
in the Typical Operating Characteristics shows ripple
rejection between 10Hz and 2kHz. As input RC filter
with a pole less than 10Hz, as shown in Figure 2, fur-
ther attenuates input ripple with this band. The voltage
drop across the input resistor (due to supply and load
current) slightly increases the dropout voltage. The
increase is given by [(I
LOAD
+ I
SUPPLY
)
R].
Choosing the Output and
Compensation Capac itors
Connecting a capacitor between Void and GND
reduces load transients. If the load exceeds 300μA,
connect a minimum of 1000pF from V
OUT
to GND. The
type of capacitor is not critical. If the total load capaci-
tance from V
OUT
to GND (C
LOAD
= output capacitor +
other capacitive load) is larger than 1000pF, connect a
compensation capacitor with a value of C
LOAD
/100
between COMP and V
OUT
.
M
10μA, Low-Dropout,
Prec ision Voltage Referenc es
_______________________________________________________________________________________
7
Pin Desc ription
Internal Connection. Make no connection
to this pin
I.C.
1, 7
PIN
FUNCTION
NAME
Input Voltage
V
IN
2
Ground
GND
4
Temperature-Proportional Output
Voltage. Generates an output voltage
proportional to junction temperature.
TEMP
3
Output Voltage Trim. Connect to the
center of a voltage divider for output
trimming. Otherwise make no
connection.
TRIM
5
Compensation Input. Connect
C
LOAD
/100 capacitor from V
OUT
to
COMP to provide capacitive load
compensation.
COMP
8
Reference Output
V
OUT
6
GND
1M
1.5M
TRIM RANGE: -35mV/+80mV
V
OUT
V
IN
TRIM
MAX872
3V
Figure 1a. Adjusting V
OUT
with the TRIM Input on the MAX872
GND
2M
1M
4M
TRIM RANGE: -200mV/+300mV
V
OUT
V
IN
TRIM
MAX874
5V
Figure 1b. Adjusting V
OUT
with the TRIM Input on the MAX874
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| MAX874 | 10レA, Low-Dropout, Precision Voltage References |
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