MITSMI LAG673F Datasheet
MITSUMI
IC for Headphone Stereos LAG673
IC for Headphone Stereos
Monolithic IC LAG673
Outline
This IC was developed for use in 3 V headphone stereos. It incorporates dual preamp, power amp, electronic
volume and motor control circuits; because it requires extremely few external components, it can be used in a
simple circuit configuration.
Features
1. Broad operating voltage range of 2.0 to 5.0 V
2. Few external components required
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. Fast forward possible using the forced-on pin
Package
SOP-28B (LAG673F)
SDIP-30A (LAG673D)
Absolute Maximum Ratings
Item Symbol Ratings Units
Operating temperature T
OPR
-
20~+65
°
C
Storage temperature T
STG
-
40~+125
°
C
Power supply current V
CC
-
0.3~+7.5 V
Operating voltage Vop 2.0~5.0 V
Power consumption Pd
450 (SOP-28B)
mW
750 (SDIP-30A)
MITSUMI
IC for Headphone Stereos LAG673
Electrical Characteristics
(Except where noted otherwise, Ta=25°C)
Item Symbol Measurement conditions Min. Typ. Max. Units
Consumption current
I
CC VIN=0V, IM=0mA 18 25 mA
(excluding motor speed controller unit)
Preamp unit (Ta=25°C)
Open-circuit gain Gvo Vo=
-
10dBm, RL=∞ 72 dB
Closed-circuit gain Gvc Vo=
-
10dBm 40 42 44 dB
Maximum output voltage Vom THD=10% 0.30 0.45 Vrms
Total harmonic distortion ratio THD V
OUT=400mVrms 0.05 0.5 %
Output noise voltage Vno
V
IN
=0V, Rg=2.2kΩ, BPF=30Hz~20kHz
150 300
µVrms
Input impedance Zin VOUT=
-
10dBm 18 22 kΩ
Crosstalk between channels C · T Rg=2.2kΩ, V
OUT=
-
10dBm 30 dB
Output voltage with preamp off Vooff V
IN=100mVrms
-
50 dB
Output resistance with preamp off Rooff 10 kΩ
Input resistance with preamp off Rioff 10 kΩ
Attenuator unit (Ta=25
°
C)
Maximum input voltage Vi max. 0.2 Vrms
Maximum attenuation Va max. Vcont=min. 66 dB
Attenuation error Vaerr Vcont=max. 0 dB
Input impedance Zia 15 20 kΩ
Control pin input resistance Zicot 100 kΩ
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 Pom THD=10%, R
L=32Ω 20 28 mW
Maximum output power II Pom THD=10%, R
L=16Ω 30 mW
Total harmonic distortion ratio THD P
OUT=5mW 0.2 2.0 %
Crosstalk between channels C · T P
OUT=5mW 45 55 dB
Output noise voltage Vn Rg=2.2kΩ, Vcont=min. 0.25 1.0
mVrms
Ripple rejection RR 100Hz, 100mVp-p4250dB
Noise of preamp + power amp Vnto V
IN=0V, Rg=2.2kΩ, Vcont=max. 6 9
mVrms
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
Reference voltage fluctuation I Vref1 V
CC between 2.0 and 5.0V
*
0.05 %/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 323843
Current coefficient fluctuation IK1V
CC between 2.0 and 6.5 V 0.5 %/V
Current coefficient fluctuation II K 2 I
M between 25 and 250 mA 0.05
%/mA
Current coefficient fluctuation III K3 Ta between -10 and 60°C 0.02 %/°C
Output voltage on forced on VCEsa T
M=200mA 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
Conditions: V
CC=3.0 V, IM = 100 mA Motor: M25E-7 (Mitsumi model)
*
Voltage drift between pins 17 and 13
VRL
K=
------------R1 IM
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