MAX874CSLASHD datasheet(7/8 Pages) MAXIM

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Applications Information

Trimming the Output Voltage

The MAX872/MAX874’s output voltage is trimmed for

0.2% tolerance at +25°C. If additional VOUT trimming is

desired, connect a potentiometer to TRIM, as shown in

Figures 1a and 1b. Adjusting VOUT away from its facto-

ry-trimmed voltage typically changes the output voltage

tempco by 7ppm/°C per 100mV.

Reducing 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 [(ILOAD + ISUPPLY)

• R].

Choosing the Output and

Compensation Capacitors

Connecting a capacitor between Void and GND

reduces load transients. If the load exceeds 300µA,

connect a minimum of 1000pF from VOUT to GND. The

type of capacitor is not critical. If the total load capaci-

tance from VOUT to GND (CLOAD = output capacitor +

other capacitive load) is larger than 1000pF, connect a

compensation capacitor with a value of CLOAD/100

between COMP and VOUT.

10µA, Low-Dropout,

Precision Voltage References

_______________________________________________________________________________________

Pin Description

Internal Connection. Make no connection

to this pin

I.C.

1, 7

FUNCTION

NAME

Input Voltage

VIN

Ground

GND

Temperature-Proportional Output

Voltage. Generates an output voltage

proportional to junction temperature.

TEMP

Output Voltage Trim. Connect to the

center of a voltage divider for output

trimming. Otherwise make no

connection.

TRIM

Compensation Input. Connect

CLOAD/100 capacitor from VOUT to

COMP to provide capacitive load

compensation.

COMP

Reference Output

VOUT

GND

1.5M

TRIM RANGE: -35mV/+80mV

VOUT

VIN

TRIM

MAX872

Figure 1a. Adjusting VOUT with the TRIM Input on the MAX872

GND

TRIM RANGE: -200mV/+300mV

VOUT

VIN

TRIM

MAX874

Figure 1b. Adjusting VOUT with the TRIM Input on the MAX874

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