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Motorola Sensor Device Data
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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+
RHI 6
7
8
3
4
5
RLO
REF
ADJ
V+
SIG
IN
V–
9
2
FROM
PIN 11
V+
20 k
+
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
+
–
F
Freescale Semiconductor, Inc.
n
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