NJM2172
OPERATIONAL AMPLIFIER WITH EVR
■ 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
NJM2172Ｖ
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∼5.5V
● Low Operating Current
ICC=5.0mA typ.
● A/Bch EVR adjust is separately
● EVR range
–3.0 ~ -95dB
● Drivability
100Ω typ.
● Bipolar Technology
● Package Outline
SSOP14
■ BLOCK DIAGRAM
14
13
■ PIN CONFIGURATION
12
11
10
9
8
Bch VCA
Bch EVR AMP
Bch OPAMP
Bch EVR
Ach EVR
VREF AMP
Bch EVR Control
Ach EVR Control
Ach OPAMP
Ach EVR AMP
Ach VCA
1
2
3
4
5
6
7
1:OP+IN A
2:OP-IN A
3:OPAMP A
4:EVROUT A
5:VCNT A
6:VCNT B
+
7:V
8:GND
9:Vref
10:REFIN
11:EVROUT
12:EVROUT B
13: OP-IN B
14: OP+IN B
NJM2172
● EVR SECTION (VCNT=2.7V,RL=100Ω unless otherwise noted)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
TEST
CIRCUIT
Voltage Gain 2
ＧＶ２
ＶＩＮ＝-10ｄＢＶ
-6.0
-3.0
0.0
ｄB
1
Total Harmonic
Distortion
THD
ＶＩＮ＝-10ｄＢＶ
-
0.15
1.0
%
2
EVR Gain
GEVR
ＶＩＮ＝-10ｄＢＶ/VCNT=2.7V～GND
80
90
-
ｄB
1
Output Noise
Voltage 2
VNO2
RS=600Ω/Ａ-Ｗｅｉｇｈｔed
-95
-85
ｄBV
Maximum Output
Voltage Swing 2
VOM２
THD=1%
Channel
Separation
CS
A/B１
EVR Deviation
A/B２
*１: Ach Amp with Bch=0dB
ＶＩＮ＝-10ｄＢＶ/Ａ-Ｗｅｉｇｈｔed
VCNT=1.5V ,VINA=VINB=-50dBV
f=1kHz, A/B ; *1
VCNT=2.0V, VINA=VINB=-50dBV
f=1kHz, A/B ; *1
-5.0
(18.0) （56.0） (uVrms)
-3.0
( 0.56 ) ( 0.71 )
−
-3.0
-79
−
-70
ｄBV
(Vrms)
ｄBV
( 110 ) ( 320 ) (uVrms)
0.0
0.0
2
1
3.0
ｄＢ
-3.0
1
3.0
1
