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5Motorola Sensor Device Data

Figure 4. LM3914 Block Diagram

REFERENCE

VOLTAGE

SOURCE

1.25 V

MODE

SELECT

AMPLIFIER

–

+

BUFFER

REF

OUT

THIS LOAD

DETERMINES

LED

BRIGHTNESS

CONTROLS

TYPE OF

DISPLAY, BAR

OR SINGLE

LED

COMPARATOR

1 of 10

LM3914

10

11

12

13

14

15

16

17

18

1

1 k

1 k

1 k

1 k

1 k

1 k

1 k

1 k

1 k

1 k

LED

V

+

R

HI

6

7

8

3

4

5

R

LO

REF

ADJ

V

+

SIG

IN

V

–

9

2

FROM

PIN 11

V

+

20 k

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–

+

–