MITSMI MM1336CF Datasheet

MITSUMI

IC for Headphone Stereos (with volume-limiting circuit) MM1336

IC for Headphone Stereos (with volume-limiting circuit)

Monolithic IC MM1336

Outline

This IC was developed for use in 3V headphone stereos. In addition to the basic functions required by
headphone stereos, it incorporates a circuit for limiting volume. In some parts of Europe hearing impairment
caused by the high volumes of headphone stereos has become a problem, and there has been strong
demand for functions for limiting loud volumes in the sets themselves. This trend is expected to gain
momentum in the U.S. as well.
This IC uses an internal ALC circuit to suppress headphone stereo output, avoiding the above problem.

Features

Package

Pin Assignment

1. Configuration: Pre-and power amps, ALC circuit, motor control

2. Internal tape selector: A selector switch allows the user to select between normal and metal tapes.

3. Internal OCL circuit: There is no need for a capacitor for high-volume output, so sets can be kept thin.

4. With preamp off pin while connected to radio

5. Designed for low shock noise
Reduced noise occuring when the power supply is turned on and off

SOP-28B (MM1336CF, MM1336DF)

SOP-28B

13 6

10

24587129

11 1413

28 24 2127 25 23 22 2026 1517 161819

1 COM1 15 VS
2 PIN1 16 C
3 PNF1 17 V

CC2

4 PBU1 18 OUT2
5 POUT1 19 V

CC1

6 IN1 20 RF
7 RECT 21 Pre OFF
8 AVNF 22 N/M

9 OUT1 23 IN2
10 COM2 24 POUT2
11 GND1 25 PBU2
12 GND2 26 PNF2
13 PCOUT 27 PIN2
14 PHASE 28 GND3

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

Power consumption Pd 700 mW

Absolute Maximum Ratings

MITSUMI

IC for Headphone Stereos (with volume-limiting circuit) MM1336

Electrical Characteristics

(Except where noted otherwise, Vcc=3V, Ta=25

°

C, f=1kHz, R

L

1=10kΩ, RL2=16Ω)

Recommended Operating Conditions

Item Symbol Ratings Units

Operating temperature T

OPR

-

20~65

°

C

Operating voltage V

OPR 2.0~5.0 V

Item Symbol Measurement conditions Min. Typ. Max. Units

Consumption current I

CC VIN=0V, when motor is off 6 12 20 mA

Preamp unit

Open-circuit gain Gvo 72 dB

Closed-circuit gain I

Normal

Gvc

Vo=

-

10dBm, f=1kHz

31 33.5 36

dB

Metal 29.5 32 34.5

Closed-circuit gain II

Normal

Gvc

Vo=

-

10dBm, f=5kHz

28 30.5 33

dB

Metal 23 25.5 28

Maximum output voltage Vom THD=10% 0.30 0.45 Vrms

Total harmonic distortion ratio THD V

OUT=

-

10dBm 0.05 0.5 %

Output noise voltage

Normal

Vno Rg=2.2k, BPF (400~30kHz)

30 75 150

µVrms

Metal 20 45 100

Crosstalk between channels C · T Rg=2.2kΩ, V

OUT=

-

10dBm 50 70 dB

Ripple rejection rate RR

VCC=3V, VR=-20dBm, f

R

=100Hz, Rg=2.2kΩ

45 55 dB

Output voltage with preamp off Vooff V

IN=100mVrms, Pre off

-

80-60 dBm

ALC (off) + power amp

Voltage gain Gv P

OUT=5mW 24 26 28 dB

Voltage gain difference between channels

GV

-

20 2dB

2CH

Maximum output current Pom THD=10% R

L=16Ω 30 50 mW

Total harmonic distortion ratio THD P

OUT=5mW 0.5 1.5 %

Crosstalk between channels C · T P

OUT=5mW 35 45 dB

Output noise voltage Vn Rg=0Ω, BPF (400~30kHz) 85 200

µVrms

Ripple rejection rate RR

VCC=3V, VR=-20dBm, f

R

=100Hz, Rg=0Ω

35 45 dB

Input resistance Ri 19 24 29 kΩ

ALC (on) + power amp

Power amp output voltage VOA V

IN=

-

40dBm

-

34-30-26 dBm

ALC initiation input voltage VINA

-

56 dBm

ALC width WALC

Input width for output

from start of up to +4dB

30 40 dB

ALC total harmonic distortion THD V

IN=

-

40dBm 0.5 1.5 %

Noise of preamp+power amp+ALC Vnto Rg=2.2kΩ (preamp) 1.5 6

mVrms