MAX6241ACPA+【PDF 9/11 页】IC VREF SERIES BURIED ZNR 8-PDIP

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Sheet目录17341

5页 6页 7页 8页 [9页]10页 11页

MAX6225/MAX6241/MAX6250

Pin Description

PIN NAME FUNCTION

1, 7, 8 I.C. Internally Connected. Do not use .

2 IN Positive Power-Supply Input

Noise Reduction. Optional capacitor

3 NR connection for wideband noise reduction.

Leave open if not used (Figure 2).

4 GND Ground

External Trim Input. Allows ±1% output

5 TRIM adjustment (Figure 1). Leave open if not

used.

Low-Noise, Precision,

+2.5V/+4.096V/+5V Voltage References

Noise Reduction

To augment wideband noise reduction, add a 1μF capaci -

tor to the NR pin (Figure 2). Larger values do not improve

noise appreciably (see Typical Operating Characteristics ).

Noise in the power-supply input can affect output noise,

but can be reduced by adding an optional bypass capaci-

tor to the IN pin and GND.

Bypassing

The MAX6225/MAX6241/MAX6250 are stable with capaci-

tive load values from 0μF to 100μF, for all values of load

current. Adding an output bypass capacitor can help reduce

noise and output glitching caused by load transients.

6

OUT

Voltage Reference Output

Applications Information

Detailed Description

Temperature Stability

The MAX6225/MAX6241/MAX6250 are highly stable,

low-noise voltage references that use a low-power tem-

perature-compensation scheme to achieve laborato-

rystandard temperature stability. This produces a nearly

flat temperature curve, yet does not require the power

associated with heated references.

The output voltage can be trimmed a minimum of 0.6%

by connecting a 10kΩ potentiometer between OUT and

GND, and connecting its tap to the TRIM pin, as shown in

Figure 1. The external trimming does not affect tempera-

ture stability.

8V TO 36V INPUT

Negative Regulator

Figure 3 shows how both a +5V and -5V precision refer-

ence can be obtained from a single unregulated +5V sup-

ply. A MAX681 generates approximately ±9V to operate

the MAX6250 reference and MAX432 inverting amplifier.

The +5V is inverted by the MAX432 chopperstabilized

amplifier. Resistor R1 is optional, and may be used to trim

the ±5V references. R2 and R4 should be matched, both

in absolute resistance and temperature coefficient. R3 is

optional, and is adjusted to set the -5V reference.

8V TO 36V INPUT

NR

IN

MAX6225

MAX6241

MAX6250

GND

OUT

TRIM

REFERENCE OUT

10k ?

*

1μF

NR

IN

MAX6225

MAX6241

MAX6250

GND

OUT

TRIM

REFERENCE OUT

*OPTIONAL

Figure 1. Output Voltage Adjustment

www.maximintegrated.com

Figure 2. Noise-Reduction Capacitor

Maxim Integrated │ 9

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