MAX872CSA Maxim Integrated Products, MAX872CSA Datasheet - Page 7

• Manufacturer Part Number: MAX872CSA
• Description: Voltage & Current References
• Manufacturer: Maxim Integrated Products

Specifications of MAX872CSA

• Product: Voltage References
• Topology: Series References
• Output Voltage: 2.5 V
• Initial Accuracy: 0.2 %
• Average Temperature Coefficient (typ): 40 PPM / C
• Series Vref - Input Voltage (max): 24 V
• Shunt Current (max): 0.5 mA
• Maximum Operating Temperature: + 70 C
• Package / Case: SOIC-8 Narrow
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT

The MAX872/MAX874’s output voltage is trimmed for
0.2% tolerance at +25°C. If additional V
desired, connect a potentiometer to TRIM, as shown in
Figures 1a and 1b. Adjusting V
ry-trimmed voltage typically changes the output voltage
tempco by 7ppm/°C per 100mV.
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
Connecting a capacitor between Void and GND
reduces load transients. If the load exceeds 300µA,
connect a minimum of 1000pF from V
type of capacitor is not critical. If the total load capaci-
tance from V
other capacitive load) is larger than 1000pF, connect a
compensation capacitor with a value of C
between COMP and V
Reducing Input Ripple with an Input Filter
PIN
1, 7
2
3
4
5
6
8
NAME
COMP
TEMP
TRIM
V
GND
I.C.
V
OUT
IN
OUT
Applications Information
to GND (C
Trimming the Output Voltage
_______________________________________________________________________________________
Internal Connection. Make no connection
to this pin
Input Voltage
Temperature-Proportional Output
Voltage. Generates an output voltage
proportional to junction temperature.
Ground
Output Voltage Trim. Connect to the
center of a voltage divider for output
trimming. Otherwise make no
connection.
Reference Output
Compensation Input. Connect
C
COMP to provide capacitive load
compensation.
LOAD
Compensation Capacitors
OUT
LOAD
Choosing the Output and
/100 capacitor from V
.
LOAD
+ I
Pin Description
FUNCTION
OUT
SUPPLY
= output capacitor +
away from its facto-
OUT
) R].
OUT
to GND. The
OUT
Precision Voltage References
trimming is
LOAD
to
/100
Figure 1a. Adjusting V
Figure 1b. Adjusting V
3V
5V
10µA, Low-Dropout,
V
V
IN
IN
MAX872
MAX874
TRIM RANGE: -200mV/+300mV
TRIM RANGE: -35mV/+80mV
OUT
OUT
GND
GND
with the TRIM Input on the MAX872
with the TRIM Input on the MAX874
TRIM
TRIM
V
V
OUT
OUT
1.5M
1M
4M
1M
2M
7