NJU8790
Pushbutton Interface EVR with Class D Stereo Power Amplifier
GENERAL DESCRIPTION
The NJU8790 is a pushbutton interface electronic volume
with class D stereo power amplifier. It includes input selector,
electronic volume, and limiter.
The NJU8790 can control the volume and the mode select
without the micro-controller by the pushbutton interface.
The NJU8790 is suitable for low power consumption and
simple control application such as mobile audio player, active
speaker and cradle speaker.
PACKAGE OUTLINE
NJU8790V
FEATURES
Operating Voltage
Low operating current
Output power
Output filter-less
Pop-noise reduction circuit
Short-circuit protection circuit
Supply voltage monitoring circuit
2-Input 1-Output selector
(Single-end / Differential)
Pushbutton interface EVR 0 to -68dB, MUTE
Active filter, limiter
CMOS Technology
Package Outline
SSOP44 (11 x 7.6 x 1.15mm, 0.5mm pitch)
BLOCK DIAGRAM
V
+
V
+
V
+
Mid
Power
indicator
Pow
Power
Button
Volume
indicator
Active filter
V
+
Max
+2.7 to +5.5V
10mA typ. (Active mode)
1µA max. (Stand-by mode)
2.7W+2.7W (V
+
= 5V, 4ohm, BTL)
V
+
V
+
V
+
TEST
SWMODE
PWSW
SELOUTL VOLINL
PWIND
VOLIND2
VOLIND1
OUTL
EQ1L
EQ2L
IREF
VDD
VREF
GND
VDDL
VDDR
NJU8790
IN1L
IN1G
IN1R
IN2L
UVLO
OUTLP
Input
Selector
Electric
Volume
Limiter
2.7W(4ohm)
1.5W(8ohm)
Stereo
Class‐D Amp
+12dB typ.
OUTLN
OUTRP
IN2R
OUTRN
VSS Short
Protection
TEST1
SELSW
SELOUTR VOLINR VOLADJ ATTADJ
ATT
UP
DOWN
OUTR
EQ1R
EQ2R
INT
SENSE
VSSL
VSSR
V
+
V
+
Att
Up
V
+
Input1/Input2
Initial Vol adjuster
‐12, ‐16, ‐20, ‐24 dB
Att. Level adjuster
‐10, ‐15, ‐20, Mute
Dn
V
+
Active filter
NJU8790 Ver.6.1 E
-1-
NJU8790
PIN CONFIGURATION
44
23
1
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Symbol
IN1L
IN1G
IN1R
IREF
SWMODE
ATT
TEST1
SELOUTR
VOLINR
OUTR
EQ1R
EQ2R
VDDR
OUTRP
VSSR
OUTRN
VDDR
SELSW
PWSW
UP
DOWN
VSS
Function
Lch Input 1
Common Input 1
Rch Input 1
Reference Current
Control Mode Setting
ATT Select Switch
Test
Selector Output R
Volume Input R
Volume Output Rch
Active Filter1 Rch
Active Filter2 Rch
Rch Output Power Supply
Rch Non-inverted Output
Rch Output GND
Rch Inverted Output
Rch Output Power Supply
Input Selector
Power ON/OFF
Volume Up Button
Volume Down Button
GND
No.
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Symbol
VDD
VOLIND2
VOLIND1
PWIND
TEST
VDDL
OUTLN
VSSL
OUTLP
VDDL
EQ2L
EQ1L
OUTL
VOLINL
SELOUTL
SENSE
INT
ATTADJ
VOLADJ
IN2L
VREF
IN2R
22
Function
Power Supply
Volume Indicator 2
Volume Indicator 1
Power Indicator
Test
Lch Output Power Supply
Lch Inverted Output
Lch Output GND
Lch Non-inverted Output
Lch Output Power Supply
Active Filter2 Lch
Active Filter1 Lch
Volume Output L
Volume Input L
Selector Output L
Limiter Sensitivity Setting
Recovery Time Setting
Attenuator Adjustor
Volume Initialization
Lch Input 2
Reference voltage
Rch Input 2
*)The relations of ”VSS= VSSL= VSSR=0V” and “VDD= VDDL=VDDR” must be maintained.
-2-
NJU8790
ABSOLUTE MAXIMUM RATING
(Ta=25°C)
PARAMETER
Power Supply Voltage
Power Dissipation*
1)
Maximum Input Voltage
Operating Temperature Range
Storage Temperature Range
Load Impedance
1)
SYMBOL
V
+
P
D2
P
D4
V
IMAX
Topr
Tstg
R
LMIN
RATING
+7
1200
1700
0 to V *
+ 2)
UNIT
V
mW
mW
V
°C
°C
Ω
-40 to +85
-40 to +125
>3.6
* Power Dissipation
EIA/JEDEC STANDARD Test board (2layer or 4layer) mounting.
The class-D amplifiers operate with high power efficiency and low dissipation power compared to general analog-amplifiers. In
theory, the NJU8790 actualize quite high output-power such as 2.7W/channel at 5V operation into 4 ohms load, and total power
is supposed to be 5.4W. For this reason, it looks as if the NJU8790 exceeds the absolute maximum rating of the power
dissipation. However, in practice, the effective output-power of usual music sound is only about 1/5 to 1/10 of its maximum
output power, thus it may never exceed the absolute maximum rating.
*
2)
Don’t apply the input voltage that exceeds supply voltage.
ELECTRICAL RECOMMENDED OPERATING CONDITION
(Ta=25°C)
PARAMETER
Operating Voltage
SYMBOL
V
+
TEST CONDITION
MIN.
2.7
TYP.
5.0
MAX.
5.5
UNIT
V
ELECTRICAL CHARACTERISTICS
♦
DC CHARACTERISTICS1
(Ta=25°C, V
+
=5.0V, unless otherwise specified)
PARAMETER
Operating Current
Reference Voltage
UVLO Detecting Voltage
SYMBOL
I
DD1
I
DD2
V
REF
V
DDDET
TEST CONDITION
No Signal, Active
No Signal, Standby
No signal
MIN.
-
-
1.47
2.0
TYP.
10.0
0.1
1.67
2.2
MAX.
15.0
1.0
1.87
2.4
UNIT
mA
µA
V
V
-3-
NJU8790
♦
DC CHARACTERISTICS2
(Ta=25°C, V
+
=5.0V, unless otherwise specified)
PARAMETER
Low Side Output
Transistor Resistance
High Side Output
Transistor Resistance
Input Resistance
Class-D Amplifier
Switching Frequency
Class-D Amplifier
Turn-On Time
Class-D Amplifier
Turn-Off Time
High Output Voltage
Low Output Voltage
High Input Voltage
Low Input Voltage
Pull-Down Resistance
Mode Resistance range 1/4
Mode Resistance range 2/4
Mode Resistance range 3/4
Mode Resistance range 4/4
Pulse Distinction Time
Auto Increment Distinction Time
Auto Increment cycle
SYMBOL
R
DSL
R
DSH
R
IN
F
OSC
T
ON
T
OFF
V
OH
V
OL
V
IH
V
IL
R
PULLDWN
R
MODE1
R
MODE2
R
MODE3
R
MODE4
T
JDGPLS
T
JDGINC
T
AINC
PWSW :Toggle SW mode
PWSW :Toggle SW mode
I
SOURCE
=1mA (pin 23,24,25)
I
SINK
=1mA (pin 23,24,25))
pin 5, pin 6, pin 7, pin 18, pin 19,
pin 20,pin 21, pin 27
pin 5, pin 6, pin 7, pin 18, pin 19,
pin 20,pin 21, pin 27
pin 19, pin 20,pin 21
pin 40, pin 41
pin 40, pin 41
pin 40, pin 41
pin 40, pin 41
pin 19, pin 20,pin 21
pin 19, pin 20,pin 21
pin 19, pin 20,pin 21
+
TEST CONDITION
OUTLP=0.01V, OUTLN=0.01V
OUTRP=0.01V, OUTRN=0.01V
OUTLP=VDDL-0.01V, OUTLN=VDDL-0.01V
OUTRP=VDDR-0.01V, OUTRN =VDDR-0.01V
MIN.
-
-
-
245
180
180
V
+
*0.8
0
V *0.8
0
-
0
40
90
150
15
0.7
117
TYP.
0.4
0.4
100
320
244
244
-
-
-
-
100
-
-
-
-
20
1
167
MAX.
-
-
-
395
300
300
V
+
V
+
*0.8
V
+
UNIT
Ω
Ω
kΩ
kHz
ms
ms
V
V
V
V
kΩ
kΩ
kΩ
kΩ
kΩ
ms
s
ms
IN1L, IN1R, IN2L, IN2R
V
+
*0.2
-
20
60
110
∞
25
1.3
217
-4-
NJU8790
♦
AC CHARACTERISTICS1
(Ta=25°C, V =5.0V, V
IN
=500mVrms, f=1kHz, BW=20Hz to 20kHz, RL=8Ω, VOL: 0dB, unless otherwise specified)
Measurement pin: OUTR(pin10), OUTL(pin35)
PARAMETER
Maximum Input Voltage
Maximum Gain
Initial Volume 1
Initial Volume 2
Initial Volume 3
Initial Volume 4
Maximum Attenuate level
Mute Level
ATT Level 1
ATT Level 2
ATT Level 3
ATT Mute Level
Channel Balance
Cross Talk
Channel Separation
SYMBOL
V
IM
G
VMAX
G
VINIT1
G
VINIT2
G
VINIT3
G
VINIT4
G
VOL-68
Mute
G
VATT1
G
VATT2
G
VATT3
G
VATT4
G
CB
CT
CS
Selected Input:
No Signal, Rg=0Ω
Rg=0Ω
R
INIT
= 0Ω
R
INIT
= 47kΩ
R
INIT
= 100kΩ
R
INIT
= OPEN
VOL= -68dB
VOL= Mute
R
ATT
=0Ω
R
ATT
=47kΩ
R
ATT
=100kΩ
R
ATT
=OPEN
TEST CONDITION
VOL=-12dB
THD=1%
MIN.
1.5
-1.0
-14
-18
-22
-26
-70
-
-12.0
-17.0
-22.0
-
-1.0
70
70
TYP.
1.7
0
-12
-16
-20
-24
-68
-90
-10.0
-15.0
-20.0
-90
0.0
80
80
MAX.
-
1.0
-10
-14
-18
-22
-66
-84
-8.0
-13.0
-18.0
-84
1.0
-
-
UNIT
Vrms
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
+
♦
AC CHARACTERISTICS2
(Ta=25°C, V =5.0V, V
IN
=500mVrms, f=1kHz, BW=20Hz to 20kHz, RL=8Ω, VOL: 0dB, unless otherwise specified)
Measurement pin: OUTRP-OUTRN (PIN 14-PIN16), OUTLP-OUTLN (PIN 31-PIN29)
PARAMETER
Output Power Efficiency
THD+N
Output Power1
Output Power2
Limit Level
Power Amplifier Gain
Output Noise Voltage 1
Output Noise Voltage 2
THD+N Measurement Circuit
SYMBOL
E
EFF
THD+N
Po
Po
V
LIM
Av
V
NO1
V
NO2
TEST CONDITION
THD=10%
P
O
=1W
THD+N=10%, R
L
=8Ω
THD+N=10%, R
L
=4Ω
V
IN
=0.7Vrms,R
SENSE
=56kΩ
No-load
No-load
Rg=0Ω, A-weighted
Rg=0Ω, A-weighted
VOL=-68dB
MIN.
-
-
-
-
1.5
-
-
-
TYP.
85
0.03
1.5
2.7
2.0
12.0
-80
(100)
-80
(100)
MAX.
-
-
-
-
2.5
-
-
-
UNIT
%
%
W/ch
W/ch
Vrms
dB
dBV
(µVrms)
dBV
(µVrms)
+
NJU8790
AUX‐0025
Filters
20kHz(AES17)
THD METER
Evaluation Board
LPF
Audio Analyzer
-5-
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