Datasheet LAG665F, LAG665D Datasheet (MITSMI)

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

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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.

*

MITSUMI

Block Diagram

IC for Headphone Stereos LAG665

Measuring Circuit

MITSUMI

THD-VOUT

10.0

1.0

0.1

0.01

-

30

-

20

-

10 0

Output voltage (dBm)

VCC=1.8V

V

CC=2.0V

V

CC=3.0V

Total harmonic distortion ratio (%)

0/6 1/6 2/6 3/6 4/6 5/6 6/6

(min.)

(max.)

0

-

20

-

40

-

60

-

80

V

CC=3.0V

V

ATT-VCONT

Output voltage attenuation (dB)

Voltage controllability
(B curve mechanical knob)

IC for Headphone Stereos LAG665

Switch Matrix

Switch Number Conditions

Item

1234567891011

Consumption current c c a b b a b b b a a IM=0mA, VR=max. Amp unit

Closed-circuit gain bbb Vo=

Maximum output voltage THD=10%

Total harmonic distortion ratio

Output noise voltage cc

Crosstalk between channels

Output voltage with preamp off

Maximum input voltage aaa V

Maximum attenuation

Voltage gain POUT=5mW

Voltage gain difference

between channels

Maximum output power Iba R

Maximum output power II a b R

Total harmonic distortion ratio

Crosstalk between channels

Output noise voltage c b VR=min.

Ripple rejection b a b VR=max.

Pre + power noise a b a VR=max.

Consumption currentt a a IM=0mA

Startup current b

Reference voltage a IM=100mA (15~16PIN)

Reference voltage fluctuation I
Reference voltage fluctuation II
Output voltage on forced on a IM=200mA

Leakage current on forced off

b

cb

ba VIN=100mVrms

c

ca

bab

Note: For switches with only on and off states, a = on and b = off.

(Except where noted otherwise,

R

L

=16Ω, V

CC

=3V, Fosc=1kHz)

-

10dBm

Vo=400mVrms

Measured after inserting BPF (30 Hz to 20 kHz)

VO=-10dBm, measured with channels swapped

using SW1, SW2

IN voltage when VR=mid, THD=10%

Difference in VOoutput when VR=max and

output voltage when VR=min

Channel output difference at VR=max

L=32Ω, THD=10%
L=16Ω, THD=10%

POUT=5mW

P

OUT

=5mW

measured with channels swapped

output voltage when VR=min

IM=100mA, VCC=2.1~5.0V (13~17PIN) Motor uni

Vcc=3.0V, IM=25~250mA

Preamp unit

Attenuator unit

Power amp unit

Characteristics

Preamp Attenuator

MITSUMI

Power supply voltage

1.0 2.0 3.0 4.0 5.0

5

10

15

20

0

40

50

60

70

30
20

10

I

CC-VCC

RL=16Ω

R

L=32Ω

I

OC (RL=16Ω)

(THD=10%) POUT max. (mW)

Power supply output

No-load consumption

current

(mA)

Power supply voltage (V)

1.0 2.0 3.0 4.0 5.00

-

10

-

20

-

30

-

40

-

50

PREAMP OFF

V

R=max.

Ripple rejection rate-VCC

FR=100Hz
V

R=100mVrms

R

L=16Ω

Ripple rejection rate (dB)

100

-

10

-

20

-

30

-

40

-

50

Frequency (Hz)

1k 10k 100k

V

CC=3.0V

crosstalk frequency

Crosstalk (dB)

100

60
50
40
30
20
10

80
70

10 100 1k 10k 100k

Frequency (Hz)

VCC=3.0V
When V

R

=max.

TOTAL GAIN

POWER AMP GAIN

Gain (dB)

100

10

1

0.1

0.1 1 10 100

Power supply output (mW)

THD-POUT

VCC=1.8V

VCC=2.0V

VCC=3.0V

Total harmonic

distortion ratio (%)

IC for Headphone Stereos LAG665

POUT. Power amp

Power amp Power amp

Voltage gain vs. frequency