NJRC NJM2794RB2

NJM2794
Ground Noise Isolation Amplifier
■ GENERAL DESCRIPTION
The NJM2794 is a ground noise isolation amplifier designed
for car audio system. It contains dual channel differential
amplifier.
It is developed for those car audio applications where long
connections between head unit and other components are
necessary and ground noise has to be eliminated.
■ FEATURES
● Dual Channel Differential Amplifier
● Operating Voltage
● Operating Current
● Common mode rejection ratio
● Maximum Output Voltage
● Supply Voltage Rejection Ratio
● Total Harmonic Distortion
● Noise Output Voltage
● Bipolar Technology
● Package Outline
■ PACKAGE OUTLINE
NJM2794RB2
NJM2794V
4.3 to 13V
14mA typ.
CMRR=60dB typ.
2Vrms min., @ THD=0.1%
60dB typ.
0.002% typ.
1.3µVrms typ.
TVSP10, SSOP14
■ BLOCK DIAGRAM
V+
IN1OUT1
IN1+
Vref
IN2+
OUT2
IN2-
GND
–1–
NJM2794
■ PIN CONFIGURATION
TVSP10
No.
1
10
5
6
1
2
3
4
5
6
7
8
9
10
Symbol
OUT1
GND
Vref
V+
OUT2
IN2+
IN2NC
IN1IN1+
Function
Output1
Ground
Reference Voltage
Power Supply
Output2
+Input2
-Input2
No Connect
-Input1
+Input1
SSOP14
–2–
1
14
7
8
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symbol
OUT1
NC
GND
Vref
V+
NC
OUT2
IN2+
NC
IN2NC
IN1NC
IN1+
Function
Output1
No Connect
Ground
Reference Voltage
Power Supply
No Connect
Output2
+Input2
No Connect
-Input2
No Connect
-Input1
No Connect
+Input1
NJM2794
■ ABSOLUTE MAXIMUM RANGES
PARAMETER
Supply Voltage
(Ta=25°C)
SYMBOL
RANGE
UNIT
+15
V
+
V
Maximum Input Voltage
VIM
Power Dissipation
PD
+(✴)
0 to V
TVSP10 : 530*
SSOP14 : 550*
V
mW
NOTE: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting
Operating Temperature
Topr
-40 to +85
°C
Storage Temperature
Tstg
-40 to +150
°C
(✴) For the maximum input voltage less than 0 toV+
+
■ ELECTRICAL CHARACTERRISTIC (V =9V,Ta=25°C)
PARAMETER
TEST CONDITION
SYMBOL
MIN.
TYP.
MAX.
UNIT
4.3
9
13
V
-
14
20
mA
3.8
4.3
4.8
V
DC CHARACTERRISTIC
+
Operating Voltage
V
Operating Current
ICC
Reference Voltage
VREF
No Signal
AC CHARACTERRISTIC (Non-inverting circuit, f=1kHz, Vin=1Vrms, Rg=0Ω, RL=10kΩ unless otherwise specified)
Voltage Gain
Gv
Channel Separation
CS
Channel Balance
BAL
f=1kHz
0.0
+1.0
dB
90
110
-
dB
-
-
0.5
dB
100
-
-
kHz
Roll-off High Frequency
fRH
Input Resistance
RIN
85
105
125
kΩ
Output Resistance
ROUT
-
90
-
Ω
Maximum Output Voltage 1
VOM1
2
2.5
-
Vrms
1.7
2.1
-
Vrms
-
2.5
-
Vrms
-
2.1
-
Vrms
-
1.3
2.5
µVrms
-
0.002
0.01
%
50
60
-
dB
-
2
-
Vrms
55
65
-
dB
Maximum Output Voltage 2
VOM2
Maximum Output Voltage 3
VOM3
Maximum Output Voltage 4
VOM4
Noise Output Voltage
VNO
Total Harmonic Distortion
Common Mode
Rejection Ratio
Common Mode
Input Voltage
Supply Voltage
Rejection Ratio
THD
-1dB
-1.0
THD=0.1%, f = 1kHz
+
THD=0.1%, f = 1kHz, V =8V
Inverting,
THD=0.1%, f = 1kHz
Inverting,
+
THD=0.1%, f = 1kHz, V =8V
Rg=600Ω, A-weighted
f=1kHz , VO=1Vrms,
BW=400Hz to 30kHz
CMRR
Vicm
CMRR=50dB
SVR
f=100Hz , Vripple=100mVrms
–3–
NJM2794
! TERMINAL DESCRIPTION
TERMINAL
DC
VOLTAGE
PIN NO.
TVSP
10
SSOP
14
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
V+
V+
1
5
1
7
OUT1
OUT2
Output1
Output2
100Ω
6
7
9
10
8
10
12
14
IN2+
IN2IN1IN1+
+Input2
-Input2
-Input1
+Input1
50Ω
FB
V+x0.48 [V]
V+x0.48 [V]
105kΩ
Vref
V+
V+
V+
260kΩ
100Ω
3
4
Vref
Reference Voltage
V+x0.48 [V]
240kΩ
–4–
NJM2794
■ APPLICATION CIRCUIT
● TVSP10 (NJM2794RB2)
OUT1
OUT1
1
+
IN1+
+
10
3.3μF
GND
2
Vref
3
+
10μF
IN1+
0.33μF
IN1+
9
IN1-
0.33μF
NC
8
V+
22μF
+
V+
IN2-
4
7
OUT2
OUT2
5
+
+
IN2-
0.33μF
IN2+
+
6
IN2+
0.33μF
3.3μF
● SSOP14 (NJM2794V)
OUT1
OUT1
1
+
IN1+
2
GND
3
Vref
4
+
10μF
IN1+
0.33μF
3.3μF
NC
+
14
NC
13
IN1-
12
+
IN1-
0.33μF
NC
11
V+
V+
22μF
5
+
NC
6
OUT2
OUT2
+
3.3μF
7
IN2-
10
+
IN2-
0.33μF
NC
9
IN2+
8
+
IN2+
0.33μF
–5–
NJM2794
■ APPLICATION BLOCK DIAGRAM
(1) Non-inverting line input
OUT
IN+
NJM2794
IN-
IC GND
Vref
VN
(2) Inverting line input
OUT
IN-
NJM2794
IN+
VN
(3) Non-inverting line output
OUT
IN+
NJM2794
IN-
IC GND
Vref
VN
(4) Inverting line output
OUT
IN-
NJM2794
IN+
IC GND
Vref
VN
–6–
IC GND
Vref
NJM2794
! TYPICAL CHARACTERISTICS
Operating Current vs. Ambient Temperature
V+=9V
Operating Current vs. Operating Voltage
30
25
25
Operating Current [mA]
Operationg Current [mA]
30
20
15
10
20
15
10
-40oC
5
5
0
0
-50
-25
0
25
50
75
100
125
150
0
3
6
Ambient Temperature [oC]
12
15
Reference Voltage vs. Operating Voltage
15
15
12
12
Reference Voltage [V]
Reference Voltage [V]
9
Operating Voltage [V]
Reference Voltage vs. Ambient Temperature
V+=9V
9
6
3
9
6
Ta=85,25,-40oC
3
0
0
-50
-25
0
25
50
75
100
125
150
0
3
6
Ambient Temparature [oC]
9
12
15
Operating Voltage [V]
Noise Output Voltage vs. Ambient Temperature
V+=9V, Rg=600Ω, A-Weighted
Noise Output Voltage vs. Signal Source Resistance
V+=9V, Ta=25oC, A-Weighted
0
0
-20
Noise Output Voltage [dBV]
Noise Output Voltage [dBV]
Ta=85oC
25oC
-40
-60
-80
-100
-120
-140
-20
-40
-60
-80
-100
-120
-50
-25
0
25
50
75
100
Ambient Temperature [oC]
125
150
0.01
0.1
1
10
100
Signal Source Resistance [kΩ]
–7–
NJM2794
! TYPICAL CHARACTERISTICS
Channel Separation vs. Ambient Temperature
V+=9V, Rg=600Ω, Vin=1Vrms, BW=400Hz-30kHz
Channel Separation vs. Frequency
V+=9V, Rg=600Ω, Vin=1Vrms, BW=10Hz-30kHz
0
-20
-20
Channel Separation [dB]
Channel Separation [dB]
IN1+ -> OUT2
0
-40
-60
-80
-100
-120
-40
-60
-80
-100
IN1+ -> OUT2
IN2+ -> OUT1
-120
-50
-25
0
25
50
75
100
125
150
10
Ambient Temperature [oC]
10000
100000
THD+N vs. Output Voltage
V+=9V, f=1kHz, Inverting Circuit
1
1
0.1
0.1
THD+N [%]
THD+N [%]
1000
Frequency [Hz]
THD+N vs. Output Voltage
V+=9V, f=1kHz, Non-Inverting Circuit
0.01
100
Ta=25,85oC
0.01
Ta=-40,25,85oC
Ta=-40oC
0.001
0.001
0.01
0.1
1
10
0.01
Output Voltage [Vrms]
THD+N vs. Output Voltage
V+=8V, f=1kHz, Non-Inverting Circuit
1
10
THD+N vs. Output Voltage
V+=8V, f=1kHz, Inverting Circuit
1
1
0.1
0.1
THD+N [%]
THD+N [%]
0.1
Output Voltage [Vrms]
0.01
0.01
Ta=-40,25,85oC
o
Ta=25,85 C
o
Ta=-40 C
0.001
0.01
0.001
0.1
1
Output Voltage [Vrms]
–8–
10
0.01
0.1
1
Output Voltage [Vrms]
10
NJM2794
! TYPICAL CHARACTERISTICS
THD+N vs. Output Voltage
V+=9V, Ta=25oC, Inverting Circuit
1
1
0.1
0.1
THD+N [%]
THD+N [%]
THD+N vs. Output Voltage
V+=9V, Ta=25oC, Non-Inverting Circuit
f=100Hz, 10kHz
0.01
f=1kHz
0.001
0.01
0.1
1
f=100Hz, 1kHz,10kHz
0.01
0.001
10
0.01
0.1
Output Voltage [Vrms]
1
1
0.1
0.1
Ta=-40,25,85oC
0.001
Ta=-40,25,85oC
0.01
0.001
10
100
1000
10000
100000
10
100
Frequency [Hz]
1000
10000
100000
Frequency [Hz]
Maximum Output Voltage vs. Operating Voltage
f=1kHz, THD=0.1%, Non-Inverting Circuit
Maximum Output Voltage vs. Operating Voltage
f=1kHz, THD=0.1%, Inverting Circuit
4
Maximum Output Voltage [Vrms]
4
Maximum Output Voltage [Vrms]
10
THD+N vs. Output Voltage
V+=9V, Vin=1Vrms, BW=22Hz-80kHz,
Inverting Circuit
THD+N [%]
THD+N [%]
THD+N vs. Output Voltage
V+=9V, Vin=1Vrms, BW=22Hz-80kHz,
Non-Inverting Circuit
0.01
1
Output Voltage [Vrms]
3
2
Ta=-40,25,85oC
1
0
3
2
Ta=-40,25,85oC
1
0
0
3
6
9
Operating Voltage [V]
12
15
0
3
6
9
12
15
Operating Voltage [V]
–9–
NJM2794
! TYPICAL CHARACTERISTICS
Maximum Output Voltage vs. Load Resistance
V+=9V, f=1kHz, Ta=25oC, BW=400 - 30kHz
THD=0.1%
5
10
8
6
4
V+=13V
3
9V
2
4
Voltage Gain [dB]
Maximum Output Voltage [Vrms]
Voltage Gain vs. Frequency
V+=9V, Vin=1Vrms, Ta=25oC
2
0
-2
Non-Inverting Circuit, Inverting Circuit
-4
-6
1
-8
4.3V
-10
0
0.1
1
10
10
100
100
Load Resistance [kΩ]
Reference Voltage Turn-on behaviour
V+=9V, Ta=25℃
Supply Voltage Rejection Ratio [dB]
Reference Voltage [V]
100000
0
Cref=4.7µF
4
3.5
3
Cref=22µF
2.5
2
Cref=10µF
1.5
1
0.5
-10
-20
-30
-40
Cref=4.7µF
-50
Cref=10µF
-60
-70
Cref=22µF
-80
-90
-100
0
0
1
2
3
4
5
6
7
8
9
10
10
100
1000
10000
100000
Frequency [Hz]
time [sec]
Supply Voltage Rejection Ratio
vs. Signal Source Resistance
Supply Voltage Rejection Ratio
vs. Operating Voltage
V+=9V, Vrippple=100mV, f=100Hz, Ta=25oC
Vripple=100mV, f=100Hz, Rg=600Ω, Ta=25oC
0
0
-10
-10
Supply Voltage Rejection Ratio
[dB]
Supply Voltage Rejection Ratio [dB]
10000
Supply Voltage Rejection Ratio
vs. Frequency
V+=9V, Vripple=100mV, Rg=600Ω, Ta=25℃
4.5
-20
-30
-40
-50
-60
-70
-80
-90
-100
-20
-30
-40
-50
-60
-70
-80
-90
-100
0.1
1
10
Signal Source Resistance [kΩ]
– 10 –
1000
Frequency [Hz]
100
0
3
6
9
Operating Voltage [V]
12
15
NJM2794
! TYPICAL CHARACTERISTICS
Common Mode Rejection Ratio vs. Input Voltage
V+=9V, f=1kHz, Ta=25oC, BW=400 - 30kHz
0
0
-10
-10
Common Mode Rejection Ratio [dB]
Common Mode Rejection Ratio [dB]
Common Mode Rejection Ratio vs. Frequency
V+=9V, Vin=1Vrms
-20
-30
-40
-50
25oC
-60
Ta=-40oC
-70
-80
o
Ta=85 C
-90
-100
-20
-30
-40
-50
Ta=-40oC
-60
25oC
-70
-80
85oC
-90
-100
10
100
1000
Frequency [Hz]
10000
100000
0.001
0.01
0.1
1
10
Input Voltage [Vrms]
[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.
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