MAX873 Просмотр технического описания (PDF) - Maxim Integrated

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MAX873

Low-Power, Low-Drift, +2.5V/+5V/+10V Precision Voltage References

Maxim Integrated 

Low-Power, Low-Drift, +2.5V/+5V/+10V

Precision Voltage References

Typical Operating Characteristics (continued)

(VIN = +5V for VOUT = +2.5V, VIN = +15V for VOUT = +10V, IOUT = 0, TA = +25°C, unless otherwise noted.)

TURN-ON TRANSIENT

(VOUT = 10V, COUT = 0)

MAX873/75/76 toc39

TURN-ON TRANSIENT

(VOUT = 10V, COUT = 1µF)

MAX873/75/76 toc40

VIN

5V/div

GND

VIN

5V/div

GND

100µs/div

VOUT

5V/div

GND

200µs/div

VOUT

5V/div

GND

Pin Description

PIN

NAME

FUNCTION

1, 8

I.C.

Internally Connected. Do not connect externally.

2

IN

Positive Power-Supply Input

3

TEMP

Temperature Proportional Output Voltage. TEMP generates an output voltage proportional to the die

temperature.

4

GND Ground

5

TRIM

Output Voltage Trim. Connect TRIM to the center of a voltage-divider between OUT and GND for

trimming. Leave unconnected to use the preset output voltage.

6

OUT

Output Voltage

7

N.C.

No Connection. Not internally connected.

Detailed Description

The MAX873/MAX875/MAX876 precision voltage refer-

ences provide accurate preset +2.5V, +5.0V, and +10V

reference voltages from up to +40V input voltages. These

devices feature a proprietary temperature-coefficient

curvature-correction circuit and laser-trimmed thin-film

resistors that result in a very low 3ppm/°C temperature

coefficient and excellent 0.05% initial accuracy. The

MAX873/MAX875/MAX876 draw 340µA of supply current

and source 30mA or sink 2mA of load current.

Trimming the Output Voltage

Trim the factory-preset output voltage on the

MAX873/MAX875/MAX876 by placing a resistive divider

network between OUT, TRIM, and GND.

Use the following formula to calculate the change in

output voltage from its preset value:

∆VOUT = 2 x (VTRIM - VTRIM (open)) x k

where:

VTRIM = 0V to VOUT

VTRIM (open) = VOUT (nominal) / 2 (typ)

k = ±6% (typ)

For example, use a 50kΩ potentiometer (such as the

MAX5436) between OUT, TRIM, and GND with the

potentiometer wiper connected to TRIM (see Figure 2).

As the TRIM voltage changes from VOUT to GND, the

output voltage changes accordingly. Set R2 to 1MΩ or

less. Currents through resistors R1 and R2 add to the

quiescent supply current.

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