NJM2172
- 1 -
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
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+INA
2: OP-INA
3: OPOUTA
4: EVROUTA
5: VCNTA
6: VCNTB
7: V+
8: GND
9: Vref
10:REFIN
11:EVROUTB
12:OPOUTB
13:OP-INB
14:OP+INB
NJM2172V
1 2 3 4 5 67
Ach
VCA
Ach EVR Control
Bch EVR Control
Bch
VCA
Bch EVR
Ach EVR
14 13 12 11 10 98
A
ch OPAMP
Bch OPAMP
Ach EVR AMP
Bch EVR AMP VREF AMP
- 2 -
NJM2172
■ ABSOLUTE MAXIMUM RATING (Ta=25°C)
PARAMETER RATINGS SYMBOL(UNIT) OTHERS
Supply Voltage +7.0 VDD (V)
Storage Temperature Range -50 to +150 Tstg (°C)
Operating Temperature Range -40 to +85 Topr (°C)
Power Dissipation 300 PD (mW) SSOP14（ONLY）
■ERECTRICAL CHARACTERISTICS (V＋=3.5V, Crefin=10pF,Cref=1µＦ, f=1kHz, Ta=25°C unless otherwise noted)
● SUPPLY
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT TEST
CIRCUIT
Operating Current ICC RL=∞ - 5.0 7.5 mA 1
Reference Voltage Vref RL=∞ 1.45 1.55 1.65 V 1
● OP-AMP SECTION
PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT TEST
CIRCUIT
Input Offset Voltage VIO RS≤10kΩ - 1.0 6.0 mV 3
Input Bias Current IIB - 100 300 nA 3
Voltage Gain 1 GV1 RL≤10kΩ 60 80 - dB 3
Maximum Output
Voltage Swing 1 VOM1 THD=1%, RL≥2.5kΩ
-3.0
( 0.7 )
0
( 1.0 )
-
( - )
dBV
(Vrms)
2
Input Common Mode
Voltage Range VICM -
0.55 to 2.55 - - V -
Output Noise Voltage VON1 Rs=600Ω / A-Weighted -
-100
( 10.0 )
-90
( 30.0 )
dBV
(µVrms)
1
Common Mode
Rejection Ratio CMR RS≤10kΩ 60 74 - dB 3
Supply Voltage
Rejection Ratio SVR RS≤10kΩ 60 80 - dB 3
Gain Bandwidth
Product GB - 2 - MHz -
- 3 -
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=2.7Vto GND 80 90 -
dB 1
Output Noise
Voltage 2 VNO2 RS = 600Ω / A - Weighted -
-95
(18.0)
-85
(56.0)
dBV
(µVrms)
1
Maximum Output
Voltage Swing 2 VOM2 THD = 1%
-5.0
( 0.56 )
-3.0
( 0.71 )
- dBV
(Vrms)
2
Channel
Separation CS VIN=-10dBV / A - Weighted -
-79
( 110 )
-70
( 320 )
dBV
(µVrms)
1
A/B1
VCNT=1.5V,VINA=VINB=-50dBV
f=1kHz, A/B ; *1
-3.0 0.0 3.0
EVR Deviation
A/B2
VCNT=2.0V,VINA=VINB=-50dBV
f=1kHz, A/B ; *1
-3.0 0.0 3.0
dB 1
*1: Ach Amp with Bch=0dB
- 4 -
NJM2172
■
■■
■ TEST CIRCUIT 1
Fig.1
Test circuit 1 shows only Ach.
7
89 10
OPAMP
EVR Control
VCA
EVR AMP VREF AMP
EVR
A-Weight
A
A-Weight
V
100
2.5k
10µ 1µ
47µ
1µ
1µ
SW1
SW2
SW3
SW4
V
V
VO1
VO2
VREF
V+
VCNT
ICC
VI1
10k
600
47µ
SW5
a b
Ach
Bch
1
2
3
4
5
1
14
2
3
4
5
1
3
12 11
6
p
in
p
in
1
2
3
4
5
- 5 -
NJM2172
■ TEST CIRCUIT 2
Fig.2
Test circuit 2 shows only Ach.
7
89 10
OPAMP
EVR Control
VCA
EVR AMP VREF AMP
EVR
V
100
2.5k
10µ 1µ
47µ
1µ
1µ
SW6
SW7 V
VO3
VO4
V+
VCNT
VI2
10k
47µ
Ach
Bch
1
2
3
4
5
1
14
2
3
4
5
1
3
12 11
6
p
in
p
in
5
1
2
3
4
20k10k
- 6 -
NJM2172
■ TEST CIRCUIT 3
Fig.3
Test circuit 3 shows only Ach.
7
8 910
OPAMP
EVR Control
VCA
EVR AMP VREF AMP
EVR
10k
V+
SW9
10k
SW8
50k
50
50
10k Ek
Ec
50k
V
VF
NULL
10µ 1µ
10k
VCC
47µ
1
2
3
5
Ach
Bch
1 2
3
5
1
14
2
3
5
13
12
6
p
in
pin
- 7 -
NJM2172
■ PIN INFORMATION
Pin No. Pin Name Function
1 OP+IN A Ach OP-AMP + Input
2 OP-IN A Ach OP-AMP - Input
3 OPOUTA Ach OP-AMP Output / EVR Input
4 EVROUT A Ach EVR Output
5 VCNT A Ach EVR Control
6 VCNT B Bch EVR Control
7 V+ Power Supply
8 GND GND
9 VREF Internal Reference Output
10 REFIN Internal Reference Input
11 EVROUT B Bch EVR Output
12 OPOUT B Bch OP-AMP Output / EVR Input
13 OP-IN B Bch OP-AMP - Input
14 OP+IN B Bch OP-AMP + Input
- 8 -
NJM2172
■ EQUIVALENT CIRCUIT
Term. No. Term .
Name Equivalent Circuit Terminal
Voltage Note
1
2
13
14
OP+INA
OP-INA
OP-INB
OP+INB
1.55V -
3
12
OPOUTA
OPOUTB
1.55V
OPOUTA / OPOUTB
Load:
RL≥2.5kΩ
4
11
EVROUTA
EVROUTB
1.55V
EVROUTA / EVROUTB
Load:
RL≥100Ω
V+
1,14 2,13
V+
10
4,11
V+
100
3,12
14k
- 9 -
NJM2172
Term. No. Term .
Name Equivalent Circuit Terminal
Voltage Note
5
6
VCNT A
VCNT B
- Input EVR control
voltage
9
10
VREF
REFIN
-
Terminal Voltage is
52 / (52+40)×
(V+ - VBE)
RL≥2KΩ
V+
10
40k
52k
9
5,6
26k154k
V+
- 10 -
NJM2172
■ APPLICATION CIRCUIT 1
Voltage follower
Fig.4
Application circuit 1 shows only Ach.
7
8 9 10
OPAMP
EVR Control
VCA
EVR AMP VREF AMP
EVR
RL
10µ 1µ
47µ
1µ
V+
VCNT
VIN
10k
47µ
5
Ach
Bch
1
2
3
4
5
1
14
2
3
4
5
13
12
11
6
pin
pin
1 2
3
4
- 11 -
NJM2172
■ APPLICATION CIRCUIT 2
Invert Circuit (Gv=6dB)
Fig.5
Application circuit 2 shows only Ach.
7
89
10
OPAMP
EVR Control
VCA
EVR AMP VREF AMP
EVR
RL
10µ 1µ
47µ
1µ
V+
VCNT
VIN
10k
47µ
10k 20k
Ach
Bch
1
2
3
4
5
1
14
2
3
4
5
13
12
11
6
pin
pin
5
1
2
3
4
- 12 -
NJM2172
■ TYPICAL CHARACTERISTICS
Quiescent Current vs. Supply Voltage Ta=25°C
0.0
2.0
4.0
6.0
8.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V+ [V]
ICC [mA]
Internal Reference Voltage vs. Supply Voltage Ta=25°C
0.0
1.0
2.0
3.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V+ [V]
VREF [V]
Quiescent Current vs. Temperature V+=3.5V
0.0
2.0
4.0
6.0
8.0
-50 0 50 100
Ta [°C]
ICC [mA]
Internal Reference Voltage vs. Temperature V+=3.5V
0.0
1.0
2.0
3.0
-50 0 50 100
Ta [°C]
VREF [V]
Input Offset Voltage vs. Supply Voltage Ta=25°C
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V+ [V]
VIO [mV]
Input Bias Current vs. Supply Voltage Ta=25°C
0
100
200
300
2.5 3.0 3.5 4.0 4.5 5.0 5.5
V+ [V]
IB [nA]
Input Offset Voltage vs. Temperature V+=3.5V
-3.0
-2.0
-1.0
0.0
1.0
2.0
3.0
-50 0 50 100
Ta [°C]
VIO [mV]
Input Bias Current vs. Temperature V+=3.5V
0
100
200
300
-50 0 50 100
Ta [°C]
IB [nA]
- 13 -
NJM2172
Voltage Gain 1 vs. Frequency
V+=3.5V,Ta=25°C,RL=2.5kΩ
0
20
40
60
80
100
0.001 0.01 0.1 1 10 100 1000 10000
f [kHz]
GV1 [dB]
Voltage Gain 1 / Phase vs. Frequency
V+=3.5V,Ta=25°C,RL=2.5kΩ,40dB Inverted Amp
-10
0
10
20
30
40
50
60
70
0.1 1 10 100 1000 10000
ｆ [kHz]
GV1 [dB]
-210
-150
-90
-30
30
φ [° ]
Phase
Gain
Voltage Gain1 vs. Temperature V+=3.5V
0
50
100
150
-50 0 50 100
Ta [°C]
GV1 [dB]
Common Mode Rejection Ratio vs. Temperature V+=3.5V
0
50
100
150
-50 0 50 100
Ta [°C]
CMR [dB]
Supply Voltage Rejection Ratio vs. Temperature V+=3.5V
0
50
100
150
-50 0 50 100
Ta [°C]
SVR [dB]
Total Harmonic Dis tortion (OPAMP) vs . Output Level
(Temperature)
V+=3.5V,f=1kHz,BW=400Hz-30kHz
0.001
0.01
0.1
1
10
-60 -40 -20 0 20
Output Level [dBV]
THD [%]
85°C,25°C
-40°C
- 14 -
NJM2172
Maximum Output Voltage 1 vs. Supply Voltage
RL=2.5kΩ,f=1kHz,THD=1%,Ta=25°C
-20.0
-10.0
0.0
10.0
2.5 3.5 4.5 5.5
V+ [V]
VOM１ [dBV]
Maximum Output Voltage 1 vs. Load Resistance
V+=3.5V,f=1kHz,THD=1%,Ta=25°C
-20.0
-10.0
0.0
10.0
0.1 1 10 100
RL [kΩ]
VOM
１
[dBV]
Voltage Gain 2 vs. EVR Control Voltage
V+=3.5V,f=1kHz,Vin=-10dBV,Ta=25°C
-120
-100
-80
-60
-40
-20
0
20
00.511.522.53
VCNT [V]
GV2 [dB]
Voltage Gain 2 / Supply Voltage vs. EVR Control Voltage
f=1kHz,Vin=-10dBV,Ta=25°C
-120
-100
-80
-60
-40
-20
0
20
0 0.5 1 1.5 2 2.5 3
VCNT [V]
GV2 [dB]
3.5V,5.5V
2.7V
Voltage Gain 2 / Frequency vs. EVR Control Voltage
V+=3.5V,Vin=-10dBV,Ta=25°C
-120
-100
-80
-60
-40
-20
0
20
0 0.5 1 1.5 2 2.5 3
VCNT [V]
GV2 [dB]
10kHz
１kHz,100Hz
Voltage Gain 2 / Temperature vs. EVR Control Voltage
V+=3.5V,f=1kHz,Vin=-10dBV
-120
-100
-80
-60
-40
-20
0
20
0 0.5 1 1.5 2 2.5 3
VCNT [V]
GV2 [dB]
85°C
25°C
-40°C
- 15 -
NJM2172
Total Harmonic Distortion (EVR) vs. Output Level
(Frequency)
V+=3.5V,Ta=25°C
0.01
0.1
1
10
-60 -40 -20 0 20
Output Level [dBV]
THD [%]
f=10kHz
BW=22Hz-80kHz
f=100Hz,1kHz
BW=22Hz-22kHz
Total Harmonic Distortion (EVR) vs. Output Level
(Temperature)
V+=3.5V,f=1kHz,BW=400Hz-30kHz
0.01
0.1
1
10
-60 -40 -20 0 20
Output Level [dBV]
THD [%]
85°C
-40°C
25°C
Output Noise Voltage 2 vs. EVR Control Voltage
V+=3.5V,Ta=25°C,A-Weighted
-120
-100
-80
-60
-40
-20
0
0123
VCNT [V]
VNO2 [dBV]
Output Noise Voltage 2 vs. Temperature
V+=3.5V,VCNT=2.7V,A-Weighted
-120
-100
-80
-60
-40
-20
0
-50 0 50 100
Ta [°C]
VNO2 [dBV]
Maximum Output Voltage 2 vs. Supply Voltage
RL=100Ω,f=1kHz,THD=1%,Ta=25°C
-20.0
-10.0
0.0
10.0
2.5 3.5 4.5 5.5
V+ [V]
VOM2 [dBV]
Maximum Output Voltage 2 vs. Load Resistance
V+=3.5V,f=1kHz,THD=1%,Ta=25°C
-20.0
-10.0
0.0
10.0
0.01 0.1 1 10
RL [kΩ]
VOM2 [dBV]
- 16 -
NJM2172
[CAUTION]
The specifications on this databook are only
given for information , without any guarantee
as regards either mistakes or omissions. The
application circuits in this databook are
described only to show representative usages
of the product and not intended for the
guarantee or permission of any right including
the industrial rights.
Channel Separation vs. EVR Control Voltage
V+=3.5V,Vin=-10dBV,f=1kHz,Ta=25°C,A-Weighted
-120
-100
-80
-60
-40
-20
0
0123
VCNT [V]
CS [dBV]
B A
A B
Channel Separation vs. Supply Voltage
VCNT=2.7V,Vin=-10dBV,f=1kHz,Ta=25°C,A-Weighted
-120
-100
-80
-60
-40
-20
0
2.5 3 3.5 4 4.5 5 5.5
V+ [V]
CS [dBV]
A B
B A
Channel Separation vs. EVR Control Voltage
V+=3.5V,Vin=-50dBV,f=1kHz,Ta=25°C,A-Weighted
-3
-2
-1
0
1
2
3
0123
VCNT [V]
CS [dBV]
EVR Deviation vs. Supply Voltage
VCNT=2.7V,Vin=-50dBV,f=1kHz,Ta=25°C,A-Weighted
-3
-2
-1
0
1
2
3
2.533.544.555.5
V+ [V]
AB [dB]
VCNT=1.5V,2V
EVR Deviation vs. Frequency
VCNT=2.7V,Vin=-50dBV,Ta=25°C
-3
-2
-1
0
1
2
3
0.01 0.1 1 10 100
f [kHz]
AB [dB]
VCNT=1.5V,2V
EVR Deviation vs. Temperature
V+=3.5V,Vin=-50dBV,f=1kHz,VCNT=2.7V,A-Weighted
-3
-2
-1
0
1
2
3
-50050100
Ta [°C]
AB [dB]
V CNT=2 V
VCNT=1.5V
