NJM2770
HIGH-POWER & LOW-VOLTAGE AUDIO POWER AMPLIFIER
■
GENERAL DESCRIPTION
The
NJM2770
is a high-power and low-voltage audio
power amplifier with standby function. No external
coupling capacitors required because of the differential
output type. Two external resistors adjust the closed
loop gain. The output power is 250mW typical at
3V-supply 8ohm-load, and 400mW typical at 4.5v-supply
16ohm-load. The standby current is only 0.1µA typical.
The package of the
NJM2770
is MSOP8(VSP8)*, and
the
NJM2770
is suitable for PCS, codeless telephone,
speaker amplifier for hands free system, and especially
cellular phone because of low operating current, low
standby current, and high power output.
■
FEATURS
●
Operating Voltage
●
Operating Current
●
Low Power-Down Current
●
High Power Otput 250mW typ.
400mW typ.
●
Gain Range at Voice Band
●
Load Impedance
●
Thermal Shut Down Function
●
Bipolar Technology
●
Package Outline
■
PACKAGE OUTLINE
NJM2770R
MSOP8(VSP8)
NJM2770RB1
MSOP8(TVSP8)
+2-+4.5V
2.0mA typ.,at V
+
=3V
0.1µA typ
at V
+
=3V,R
L
=8Ω
V
+
=4.5V,R
L
=16Ω
Gv=0-43dB
R
L
=4-200Ω
MSOP8 (VSP8)* MSOP8 (TVSP8)**
*MEET JEDEC MO-187-DA
**MEET JEDEC MO-187-DA / THIN TYPE
■
PIN CONFIGURATION & BLOCK DIAGRAM
V
+
6
BIAS
-V
IN
4
+V
IN
3
#A
1
CD
5
V
OUT
1
40kΩ
40kΩ
#B
+V
REF
2
50kΩ
145kΩ
50kΩ
TSD
Pin Function
1.CD
2.+V
REF
3.+V
IN
4.-V
IN
5.V
OUT
1
6.V
+
7.GND
8.V
OUT
2
8
V
OUT
2
7
GND
-1-
NJM2770
■
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
Supply Voltage
V
+
Power Dissipation
Operating Temperature Range
Storage Temperature Range
P
D
Topr
Tstg
RATINGS
+5
(MSOP8 (VSP8),
MSOP8 (TVSP8)) 400
-40 to +85
-40 to +150
(Ta=25°C)
UNIT
V
mW
°C
°C
■
ELECTRICAL CHARACTERISTICS
(V
+
=3.0V,R
L
=8Ω,f=1kHz,1pin=2V,Ta=25°C,unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITION
MIN.
TYP. MAX. UNIT
Operating Voltage Range V
+
2.0
-
4.5
V
Operating Current
I
CC
R
L
=∞,no signal
-
2.0
4.0
mA
Power Down Current
I
CCD
R
L
=∞ 1pin=0.8V,no signal
-
0.1
1.0
µA
Open Loop Gain
A
V
1
80
85
-
dB
Amp#A, f<100Hz
Closed Loop Gain
A
V
2
-0.35
0
+0.35
dB
Amp#B
Output Power
P
O
1
THD=10%
110
250
-
mW
+
200
400
-
mW
P
O
2
V =4.5V, R
L
=16Ω, THD=10%
Total Harmonic Distortion THD1
P
O
=100mW, G
VD
=6dB
-
0.1
0.5
%
+
-
0.1
-
%
THD2
V =4.5V, R
L
=16Ω, P
O
=150mW, G
VD
=6dB
Power Supply Rejection
SVR1
50
-
-
dB
C1=∞, C2=0.01µF, DC
Ratio
(V
+
=3.0V-4.5V)
SVR2
-
35
-
dB
C1=0.1µF, C2=0
SVR3
-
70
-
dB
C1=1.0µF, C2=4.7µF
Mute Attenuation
MAT
f =1kHz-20kHz, 1pin=0.8V
-
80
-
dB
Output Voltage
V
O
1
0.95
1.10
1.25
V
+
V
O
2
-
1.85
-
V
(R
f
=20kΩ, DC)
V =4.5V, R
L
=16Ω
+
+
Output High Level
V
OH
I
OUT
=-75mA, V =2.0-4.5V
-
V -1.0
-
V
+
Output Low Level
V
OL
I
OUT
=75mA, V =2.0-4.5V
-
0.21
-
V
-30
0
+30
mV
Output DC Offset
R
f
=20kΩ, 5pin-8pin
∆V
O
Input Bias Current
I
B
4pin
-100
-
100
nA
Equivalent Resistance
R
+IN
3pin
100
170
220
kΩ
R
REF
2pin
18
26
40
kΩ
+
CD Input Voltage H
V
CDH
1pin
2.0
-
V
V
CD Input Voltage L
V
CDL
1pin
0.0
-
0.8
V
+
CD Input Resistance
R
CD
V =V
CD
=4.5V, 1pin
50
85
175
kΩ
■
CONTROL TERMINAL EXPLANATION
CHIP DISABLE CONTROL(CD PIN)
PARAMETER
CONTROL SIGNAL
CD OFF
H(=V
CDH
)
CD ON
L(=V
CDL
)
STATUS
IC is active.
IC is standby. (with Mute)
-2-
NJM2770
■
APPLICATION CURCUIT
V
+
=+3V
10µF
Rf
20kΩ
6
Ci
INPUT
0.1µF
Ri
4
20kΩ
3
#A
BIAS
1
CD(POWER DOWN)
5
C
1
1.0µF
C
2
2
4.7µF
SPEAKER
8Ω/16Ω
50kΩ
145kΩ
50kΩ
#B
TSD
8
7
note:1.The CD terminal(1pin) should connect High level(>2.0V), when NJM2770 is active.
The standby mode, when the CD terminal is Low level(<0.8V).
2.To add the C1 and C2 capacitor, the power-supply-rejection-ratio will be improved.
When C1 is large vaiue, C2 will be unnecessary.
3.The power-up time depend on the C1 and C2 capacitor.
4.The input current of CD terminal is as shown below figure.
V
+
72kΩ
1pin
80kΩ
GND
5.No connect oscillation-protect RC required.
To connect oscillation-protect RC, if the NJM2770 oscillate with PC board/stray capacitor/long speaker wire
and others condition.
-3-
NJM2770
MEMO
[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.
-4-
Mouser Electronics
Authorized Distributor
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