NJM2172
- 1 -
OPERATIONAL AMPLIFIER WITH EVR
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■■
■ GENERAL DESCRIPTION ■
■■
■ PACKAGE OUTLINE
The NJM2172 is single supply, dual OP-AMP with
electric variable resistor (EVR), which contains buffer
amplifier, OP-AMP, reference voltage circuit, EVR and EVR
control circuit.
The reference is fixed around 1/2 V
+
level internally, and
only required few external parts.
The A and B EVR is control separately, and amp drive
up to 100Ω(typ.) load. The NJM2172 is suitable for
camcorder, CD, MD, and other audio signal process
system.
■
■■
■ FEATURES
●
Low Power Supply Voltage V
+
= 2.7 to 5.5V
●
Low Operating Current Icc = 5.0mA typ.
●
A/Bch EVR adjust is separately
●
EVR range -3.0 to -95ｄB
●
Drivability 100Ω typ.
● Bipolar Technology
● Package Outline
SSOP14
■
■■
■ BLOCK DIAGRAM
■ PIN CONFIGURATION
1: OP
+IN
A
2: OP
-IN
A
3: OP
OUT
A
4: EVR
OUT
A
5: V
CNT
A
6: V
CNT
B
7: V
+
8: GND
9: Vref
10:REF
IN
11:EVR
OUT
B
12:OP
OUT
B
13:OP
-IN
B
14:OP
+IN
B
NJM2172V
1 2 3 4 5 6 7
Ach
VCA
Ach EVR Control
Bch EVR Control
Bch
VCA
Bch EVR
Ach EVR
14 13 12
11 10
9 8
ch OPAMP
Bch OPAMP
Ach EVR AMP
Bch EVR AMP
VREF AMP
