MITSMI LAG665F, LAG665D Datasheet
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 Symbol Ratings Units
Operating temperature Topr
Storage temperature Tstg
Power supply current V
Power consumption Pd
Operating voltage Vop 2.0~5.0 V
CC
-
20~+65
-
40~+125
-
0.3~+7.5 V
450 (SOP-28B)
750 (SDIP-30A)
°
C
°
C
mW
MITSUMI
IC for Headphone Stereos LAG665
Electrical Characteristics
Item
Consumption current I
Preamp unit (Ta=25
Open-circuit gain Gvo Vo=
Closed-circuit gain Gvc Vo=
°C)
(Except where noted otherwise, Ta=25°C)
Symbol
CC VIN=0V, IM=0mA 18 25 mA
Measurement conditions Min. Typ. Max. Units
-
10dBm, RL=∞ 72 dB
-
10dBm 40 42 44 dB
Maximum output voltage Vom THD=10% 0.45 0.6 Vrms
Total harmonic distortion ratio THD V
Output noise voltage Vno V
Input impedance Z
IN VOUT=
IN=0, Rg=2.2k BPF(30~20kHz) 150 300 µVrms
Crosstalk between channels C.T Rg=2.2k, V
Output voltage with preamp off Vooff V
Output resistance with preamp off
Rooff 10 kΩ
OUT=400mVrms 0.05 0.5 %
-
10dBm 18 22 kΩ
OUT=
-
10dBm 30 dB
IN=100mVrms
-
50 dB
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
Attenuator unit (Ta=25
Maximum input voltage
Maximum attenuation
°
C)
Vi max.
Va max
. Vcont=min. 66 dB
0.2 Vrms
Attenuation error Vaerr Vcont=max. 0 dB
Input impedance Z
IN 15 20 kΩ
Control pin input resistance Zicot 100 kΩ
Measurement conditions Unless noted otherwise, V
Power amp unit (Ta=25
°
C)
Voltage gain Gv P
Voltage gain difference between channels
Gv Vcont=max. 0 3 dB
Maximum output power I Pom1 THD=10%, R
Maximum output power II Pom2 THD=10%, R
Total harmonic distortion ratio THD P
Crosstalk between channels C.T P
CC=3.0 V, f=1 kHz, (RL=16Ω).
OUT=5mW 26 28 30 dB
L=32Ω 20 28 mW
L=16Ω 30 mW
OUT=5mW 0.2 2.0 %
OUT=5mW 20 30 dB
Output noise voltage Vn Rg=2.2k, Vcont=min. 0.25 1.0 mVrms
Ripple rejection RR V
Noise of preamp + power amp Vnto V
CC=3V, 100Hz, 100mVp
IN=0V, Rg=2.2k, Vcont=max. 6 9 mVrms
Measurement conditions Unless noted otherwise, V
Motor control unit (Ta=25
°
C)
CC=3.0 V, f=1 kHz,(RL=16Ω).
-
p3440 dB
Consumption current IMC 3.0 5.0 mA
Startup current IMS 500 mA
Reference voltage Vref Between RML
Reference voltage fluctuation I Vref1 V
Reference voltage fluctuation II Vref2 I
CC between 2.1 and 5.0 V
M between 25 and 250 mA 0.01 %/mA
Reference voltage fluctuation III Vref3 Ta between
-
ADJ pins 0.72 0.80 0.87 V
*
-
10 and 50°C 0.01 %/°C
0.05 %/V
Current coefficient K323843
Current coefficient fluctuation IK1 V
Current coefficient fluctuation II K2 I
Current coefficient fluctuation III K3 Ta between
Output voltage on forced on VCEsa I
CC between 2.1 and 5.0 V 0.5 %/V
M between 25 and 250 mA 0.05 %/mA
-
10 and 50°C 0.02 %/°C
M=200mA, 14PIN=VCC 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, IM=100 mA, circuit constants as specified.
Motor: M25E-7 (Mitsumi model)
Voltage across pins 13 and 19 (motor pins) fluctuates.
*
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