MITSUMI
IC for Headphone Stereos LAG665
IC for Headphone Stereos
Monolithic IC LAG 665
Outline
This IC was developed for use in headphone stereos, and incorporates dual preamp, power amp, electronic
VR and motor control circuits. It can be used in a simple circuit configuration which requires very few external
components.
Features
1. Broad operating voltage range of 2.0 to 5.0 V (amp system operates to 1.8 V)
2. Few external components required
1. Internal equalizer resistance
2. Direct coupling of preamps, electronic VR, power amp
3. No need for output coupling capacitor
3. Well-balanced electronic VR, A-curve attenuation characteristic obtained with B-curve VR
4. Internal motor control circuit, with noise from motor driving unit suppressed
5. Provided with pin to turn off preamps
Package
SOP-28B (LAG665F)
SDIP-30A (LAG665D)
Absolute Maximum Ratings
Item
Operating temperature
Storage temperature
Power supply current
Power consumption
Operating voltage
Symbol
Topr
Tstg
V
CC
Pd
Vop
Ratings
-20~+65
-40~+125
-0.3~+7.5
450 (SOP-28B)
750 (SDIP-30A)
2.0~5.0
Units
°
C
°
C
V
mW
V
MITSUMI
IC for Headphone Stereos LAG665
Electrical Characteristics
(Except where noted otherwise, Ta=25
°C
)
Item
Symbol
Measurement conditions
Min. Typ. Max.
Units
Consumption current
I
CC
V
IN
=0V, IM=0mA
18
25
mA
Preamp unit (Ta=25
°C
)
72
dB
Open-circuit gain
Gvo
Vo=-10dBm, R
L
=∞
Closed-circuit gain
Gvc
Vo=-10dBm
40
42
44
dB
Maximum output voltage
Vom
THD=10%
0.45
0.6
Vrms
Total harmonic distortion ratio
THD
V
OUT
=400mVrms
0.05
0.5
%
150
300
µVrms
Output noise voltage
Vno
V
IN
=0, Rg=2.2k BPF(30~20kHz)
V
OUT
=-10dBm
18
22
kΩ
Input impedance
Z
IN
30
dB
Crosstalk between channels
C.T
Rg=2.2k, V
OUT
=-10dBm
Output voltage with preamp off
Vooff
V
IN
=100mVrms
-50
dB
Output resistance with preamp off
Rooff
10
kΩ
Input resistance on pre off
Rioff
10
kΩ
Measurement conditions Unless noted otherwise, V
CC
=3.0 V, f=1 kHz.
The preamp off pin is left open
°
C)
Attenuator unit (Ta=25
Vi max.
0.2
Vrms
Maximum input voltage
Maximum attenuation
Va max.
Vcont=min.
66
dB
Attenuation error
Vaerr
Vcont=max.
0
dB
15
20
kΩ
Input impedance
Z
IN
Control pin input resistance
Zicot
100
kΩ
Measurement conditions Unless noted otherwise, V
CC
=3.0 V, f=1 kHz, (R
L
=16Ω).
Power amp unit (Ta=25
°
C)
Voltage gain
Gv
P
OUT
=5mW
26
28
30
dB
Voltage gain difference between channels
Gv
Vcont=max.
0
3
dB
Maximum output power
I
Pom1
THD=10%, R
L
=32Ω
20
28
mW
Maximum output power
II
Pom2
THD=10%, R
L
=16Ω
30
mW
Total harmonic distortion ratio
THD
P
OUT
=5mW
0.2
2.0
%
20
30
dB
Crosstalk between channels
C.T
P
OUT
=5mW
Output noise voltage
Vn
Rg=2.2k, Vcont=min.
0.25
1.0
mVrms
34
40
dB
Ripple rejection
RR
V
CC
=3V, 100Hz, 100mVp-p
6
9
mVrms
Noise of preamp + power amp
Vnto
V
IN
=0V, Rg=2.2k, Vcont=max.
Measurement conditions Unless noted otherwise, V
CC
=3.0 V, f=1 kHz,(R
L
=16Ω).
Motor control unit (Ta=25
°
C)
Consumption current
IMC
3.0
5.0
mA
Startup current
IMS
500
mA
Reference voltage
Vref
Between RML-ADJ pins
0.72
0.80
0.87
V
0.05
%/V
Reference voltage fluctuation
I Vref1
V
CC
between 2.1 and 5.0 V
Reference voltage fluctuation
II Vref2
I
M
between 25 and 250 mA
0.01
%/mA
Reference voltage fluctuation
III Vref3
Ta between -10 and 50°C
0.01
%/
°
C
Current coefficient
K
32
38
43
0.5
%/V
Current coefficient fluctuation
I
K1
V
CC
between 2.1 and 5.0 V
Current coefficient fluctuation
II
K2
I
M
between 25 and 250 mA
0.05
%/mA
Current coefficient fluctuation
III K3
Ta between -10 and 50°C
0.02
%/
°
C
Output voltage on forced on
VCEsa
I
M
=200mA, 14PIN=V
CC
0.6
V
Input resistance on forced on
Rion
5.6
kΩ
Leakage current on forced off
IML
200
µA
Input resistance on forced off
Ricon
33
kΩ
Measurement conditions Unless noted otherwise, V
CC
=3.0, I
M
=100 mA, circuit constants as specified.
Motor: M25E-7 (Mitsumi model)
Voltage across pins 13 and 19 (motor pins) fluctuates.
*
*
MITSUMI
IC for Headphone Stereos LAG665
Block Diagram
Measuring Circuit
MITSUMI
IC for Headphone Stereos LAG665
Switch Matrix
Switch Number
Item
1
2
c
b
3
a
b
4
b
5
b
6
a
7
b
8
b
Conditions
(Except where noted otherwise,
9 10 11
R
L
=16Ω, V
CC
=3V, Fosc=1kHz)
b a a
IM=0mA, VR=max.
Vo=-10dBm
THD=10%
Vo=400mVrms
Measured after inserting BPF (30 Hz to 20 kHz)
VO=-10dBm, measured with channels swapped
using SW1, SW2
a
a
a
V
IN
=100mVrms
V
IN
voltage when VR=mid, THD=10%
Difference in V
O
output when VR=max and
output voltage when VR=min
P
OUT
=5mW
Channel output difference at VR=max
b
a
c
a
c
b
a
a
b
R
L
=32Ω, THD=10%
R
L
=16Ω, THD=10%
P
OUT
=5mW
P
OUT
=5mW measured with channels swapped
output voltage when VR=min
VR=min.
VR=max.
VR=max.
IM=0mA
IM=100mA (15~16PIN)
IM=100mA, V
CC
=2.1~5.0V (13~17PIN)
Vcc=3.0V, IM=25~250mA
IM=200mA
c
Closed-circuit gain
b
Maximum output voltage
Total harmonic distortion ratio
Output noise voltage
c
b
Crosstalk between channels
c
Output voltage with preamp off
b
Maximum input voltage
a
Maximum attenuation
Voltage gain
Voltage gain difference
between channels
Maximum output power
I
Maximum output power
II
Total harmonic distortion ratio
Crosstalk between channels
Output noise voltage
Ripple rejection
Pre + power noise
Consumption currentt
Startup current
Reference voltage
Reference voltage fluctuation
I
Reference voltage fluctuation
II
Output voltage on forced on
Leakage current on forced off
c
Consumption current
Amp unit
c
Preamp unit
b
Attenuator unit
Power amp unit
b
a
b
a
b
a
a
b
a
Motor uni
a
b
a
b
Note: For switches with only on and off states, a = on and b = off.
Characteristics
Preamp
THD-V
OUT
Attenuator
Output voltage attenuation (dB)
V
ATT
-V
CONT
0
-20
-40
-60
-80
0/6
(min.)
1/6
2/6
3/6
4/6
5/6
6/6
(max.)
V
CC
=3.0V
Total harmonic distortion ratio (%)
V
CC
=1.8V
V
CC
=2.0V
V
CC
=3.0V
10.0
1.0
0.1
0.01
-30
Voltage controllability
(B curve mechanical knob)
-20
-10
0
Output voltage (dBm)
MITSUMI
IC for Headphone Stereos LAG665
P
OUT
.
Power supply output
(THD=10%) P
OUT
max. (mW)
I
CC
-V
CC
70
60
50
40
30
20
10
0
1.0
I
OC
(R
L
=16Ω)
R
L
=16Ω
R
L
=32Ω
20
15
10
5
100
Power amp
THD-P
OUT
V
CC
=1.8V
V
CC
=2.0V
V
CC
=3.0V
10
No-load consumption
current (mA)
Total harmonic
distortion ratio (%)
1
2.0
3.0
4.0
5.0
0.1
0.1
1
10
100
Power supply voltage
Power supply output (mW)
Power amp
Ripple rejection rate (dB)
Ripple rejection rate
-V
CC
Crosstalk (dB)
-10
-20
-30
-40
-50
0
1.0
2.0
3.0
4.0
5.0
PREAMP OFF
V
R
=max.
F
R
=100Hz
V
R
=100mVrms
R
L
=16Ω
-10
-20
-30
-40
-50
100
Power amp
crosstalk frequency
V
CC
=3.0V
1k
10k
100k
Power supply voltage (V)
Frequency (Hz)
Voltage gain vs. frequency
100
80
70
60
50
40
30
20
10
10
100
V
CC
=3.0V
When V
R
=max.
TOTAL GAIN
Gain (dB)
POWER AMP GAIN
1k
10k
100k
Frequency (Hz)
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