MX581(2004) Просмотр технического описания (PDF) - Maxim Integrated

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MX581
(Rev.:2004)

High-Precision, 10V Reference

Maxim Integrated 

High-Precision, 10V Reference

6.8kΩ

10kΩ

4.3kΩ

-15V

+15V

+VS

GND

MX581

R

VOUT

+10.0V

R

TRIM

RANGE

MAX.

∆TCR

22Ω ±30mV 3.5ppm/°C

12Ω ±10mV 2.0ppm/°C

3.9Ω ±5mV 0.6ppm/°C

Figure 2. Optional Fine Trim Configuration

Voltage Temperature Coefficient

The temperature characteristic of the MX581 consis-

tently follows an “S-curve” (see Typical Operating

Characteristics). A five-point 100% test guarantees

compliance with -55°C to +125°C specifications and

a three-point 100% test guarantees 0°C to +70°C

specifications.

The voltage change specifications in the Electrical

Characteristics table state the maximum deviation over

temperature from the reference’s initial value at +25°C,

as well as drift in ppm/°C. By adding the maximum

deviation for a given device to its initial tolerance, the

total error is quickly determined.

Output Current

The MX581 is unique in that it can sink as well as

source current. The circuit is also protected for output

shorts to either +VS or GND. The output voltage versus

current characteristic is shown in the Typical Operating

Characteristics. For applications that require the MX581

to sink current, maintain a load capacitance of 10nF or

greater for proper operation.

Dynamic Performance

The turn-on characteristic and settling performance of

the MX581 are shown in the Typical Operating

Characteristics. Both coarse and fine transient

response is shown. The reference typically settles to

1mV within 180µs after power is applied.

Applications Information

Precision High-Current Reference

A pnp power transistor, or Darlington, is easily connect-

ed to the MX581 to greatly increase its output current.

The circuit of Figure 3 provides a +10V output at up to

4A. If the load has a significant capacitive component,

compensation capacitor, C1, should be added. If the

load is purely resistive, high-frequency supply rejection

is improved without C1.

Low Input Voltage

Although line regulation is specified from 12.5V to 40V,

the MX581 can operate with a +12V ±5% input by

adding a resistor as shown in Figure 4. The resistor

reduces the current that must be supplied from VOUT.

Note that the resistor cannot be used at higher input

voltages since, as the supply increases, it sources

more current than VOUT can sink.

VIN ≥ 15V

470Ω

C1

0.1µF

+VS

MX581

VOUT

GND

2N6040

VOUT

10V AT 4A

Figure 3. High-Current Precision Supply

+VS

MX581

VOUT

GND

12.5V ±5%

580Ω 5%

10V AT 0mA TO 5mA

Figure 4. 12V Supply Connection

4 _______________________________________________________________________________________

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