MAX6143 データシートの表示（PDF） - Unspecified

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MAX6143

High-Precision Voltage Reference with Temperature Sensor

Unspecified 

High-Precision Voltage Reference with

Temperature Sensor

Typical Operating Characteristics (continued)

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

SHUTDOWN TRANSIENT

(VOUT = 10V, VIN = 15V, COUT = 0)

MAX6413toc45

SHUTDOWN TRANSIENT

(VOUT = 10V, VIN = 15V, COUT = 1µF)

MAX6143toc46

VSHDN

5V/div

VSHDN

5V/div

100µs/div

GND

VOUT

5V/div

GND

100µs/div

GND

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

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

3

TEMP

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

SHDN Active-Low Shutdown. Connect SHDN to IN for normal operation.

Detailed Description

The MAX6143 precision voltage reference provides

accurate preset +2.5V, +3.3V, +4.096V, +5.0V, and

+10V reference voltages from up to +40V input voltages.

These devices feature a proprietary temperature-coeffi-

cient curvature-correction circuit and laser-trimmed thin-

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

temperature coefficient and excellent 0.05% initial accu-

racy. The MAX6143 draws 340µA of supply current and

sources 30mA or sinks 2mA of load current.

Trimming the Output Voltage

Trim the factory-preset output voltage on the MAX6143

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 = 0 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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