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.
■
PACKAGE OUTLINE
NJM2794RB2
MSOP10 (TVSP10)
NJM2794V
(SSOP14)
■
FEATURES
●
Dual Channel Differential Amplifier
●
Operating Voltage
4.3 to 13V
●
Operating Current
14mA typ.
●
Common mode rejection ratio
CMRR=60dB typ.
●
Maximum Output Voltage
2Vrms min., @ THD=0.1%
●
Supply Voltage Rejection Ratio
60dB typ.
●
Total Harmonic Distortion
0.002% typ.
●
Noise Output Voltage
1.3µVrms typ.
●
Bipolar Technology
●
Package Outline
MSOP10 (TVSP10)*
SSOP14
*MEET JEDEC MO-187-DA / THIN TYPE
■
BLOCK DIAGRAM
V+
IN1-
OUT1
IN1+
Vref
IN2+
IN2-
OUT2
GND
–1–
NJM2794
■
PIN CONFIGURATION
MSOP10(TVSP10)
No.
Symbol
Function
1
10
5
6
1
2
3
4
5
6
7
8
9
10
OUT1
GND
Vref
V+
OUT2
IN2+
IN2-
NC
IN1-
IN1+
Output1
Ground
Reference Voltage
Power Supply
Output2
+Input2
-Input2
No Connect
-Input1
+Input1
SSOP14
1
14
No.
Symbol
Function
7
8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
OUT1
NC
GND
Vref
V+
NC
OUT2
IN2+
NC
IN2-
NC
IN1-
NC
IN1+
Output1
No Connect
Ground
Reference Voltage
Power Supply
No Connect
Output2
+Input2
No Connect
-Input2
No Connect
-Input1
No Connect
+Input1
–2–
NJM2794
■
ABSOLUTE MAXIMUM RANGES
PARAMETER
Supply Voltage
Maximum Input Voltage
(Ta=25°C)
RANGE
+15
0 to V
MSOP10(TVSP10) : 530*
SSOP14 : 550*
NOTE: EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting
+
(
✴
)
SYMBOL
V
+
UNIT
V
V
V
IM
Power Dissipation
Operating Temperature
Storage Temperature
P
D
Topr
Tstg
mW
°C
°C
-40 to +85
-40 to +150
(✴) For the maximum input voltage less than 0 toV
+
■
ELECTRICAL CHARACTERRISTIC
(V =9V,Ta=25°C)
PARAMETER
DC CHARACTERRISTIC
Operating Voltage
Operating Current
Reference Voltage
Voltage Gain
Channel Separation
Channel Balance
Roll-off High Frequency
Input Resistance
Output Resistance
Maximum Output Voltage 1
Maximum Output Voltage 2
Maximum Output Voltage 3
Maximum Output Voltage 4
Noise Output Voltage
Total Harmonic Distortion
Common Mode
Rejection Ratio
Common Mode
Input Voltage
Supply Voltage
Rejection Ratio
V
+
+
SYMBOL
TEST CONDITION
MIN.
TYP.
MAX.
UNIT
4.3
No Signal
-
3.8
-1.0
f=1kHz
9
14
4.3
0.0
110
-
-
105
90
2.5
2.1
2.5
2.1
1.3
0.002
60
2
65
13
20
4.8
+1.0
-
0.5
-
125
-
-
-
-
-
2.5
0.01
-
-
-
V
mA
V
dB
dB
dB
kHz
kΩ
Ω
Vrms
Vrms
Vrms
Vrms
µVrms
%
dB
Vrms
dB
I
CC
V
REF
AC CHARACTERRISTIC
(Non-inverting circuit, f=1kHz, Vin=1Vrms, R
g
=0Ω, R
L
=10kΩ unless otherwise specified)
Gv
CS
BAL
f
RH
R
IN
R
OUT
V
OM1
V
OM2
V
OM3
V
OM4
V
NO
THD
CMRR
Vicm
SVR
90
-
100
85
-
-1dB
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 , V
O
=1Vrms,
BW=400Hz to 30kHz
+
2
1.7
-
-
-
-
50
CMRR=50dB
f=100Hz , V
ripple
=100mVrms
-
55
–3–
NJM2794
■
TERMINAL DESCRIPTION
PIN NO.
TVSP
10
SSOP
14
SYMBOL
FUNCTION
EQUIVALENT CIRCUIT
TERMINAL
DC
VOLTAGE
V+
V+
1
5
1
7
OUT1
OUT2
Output1
Output2
100Ω
FB
V
+
x0.48 [V]
6
7
9
10
8
10
12
14
IN2+
IN2-
IN1-
IN1+
+Input2
-Input2
-Input1
+Input1
50Ω
V
+
x0.48 [V]
105kΩ
Vref
V+
V+
260kΩ
100Ω
V+
3
4
Vref
Reference Voltage
240kΩ
V
+
x0.48 [V]
–4–
NJM2794
■
APPLICATION CIRCUIT
q
MSOP10(TVSP10) : NJM2794RB2
OUT1
+
OUT1
IN1+
1
10
+
IN1+
3.3
μ
F
GND
0.33
μ
F
IN1-
2
9
+
IN1-
0.33
μ
F
Vref
10
μ
F
V+
+
+
NC
3
V+
8
22
μ
F
4
IN2-
7
+
IN2-
0.33
μ
F
OUT2
+
OUT2
IN2+
5
6
+
IN2+
3.3
μ
F
0.33
μ
F
q
SSOP14 : NJM2794V
OUT1
+
OUT1
IN1+
1
14
+
IN1+
3.3
μ
F
NC
NC
0.33
μ
F
2
13
GND
IN1-
3
12
+
IN1-
0.33
μ
F
Vref
10
μ
F
V+
+
+
NC
4
V+
11
22
μ
F
5
IN2-
10
+
IN2-
0.33
μ
F
NC
NC
6
9
OUT2
+
OUT2
IN2+
7
8
+
IN2+
3.3
μ
F
0.33
μ
F
–5–
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