SANYO LA4587M Datasheet

Ordering number: EN5204A

Monolithic Linear IC

LA4587M

Preamplifier + Power Amplifier

for 1.5 V Headphone Stereos

Overview

The LA4587M is a system IC that includes all of the necessary
functions for a playback set on a single chip, reducing the
number of external components needed.

Functions

.

Stereo preamplifier (supports auto reverse function,
switchable between metal and normal tape)

.

Stereo power amplifier (OCL, mute function)

.

Ripple filter

.

Low boost function (BTL operation in low-frequency range)

.

AMSS (Automatic Music Select System)

.

Power switch

Features

.

Preamplifier has a high open-loop gain (VGO= 73 dB).

.

Preamplifier requires no NF capacitor.

.

Virtual ground capacitor can be 1 µF or less. (Lower
impedance is achieved by having a V

.

Ripple filter requires no capacitor for preventing oscillation.

.

Powerful output is obtained in low boost output
(Po = 21 mW/V

.

A high-frequency cutoff capacitor is built into the
preamplifier and power amplifier inputs; anti-buzz provision.

= 1.2 V, f = 100 Hz).

CC

amplifier built in.)

REF

Package Dimensions

unit : mm

3102-QFP48D

[LA4587M]

SANYO : QIP48D

Specifications

Maximum Ratings atTa=25°C

Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power dissipation Pd max 635 mW
Operating temperature Topr –10 to +60
Storage temperature Tstg –40 to +125

max 3.0 V

CC

Allowable power dissipation, Pd max − mW

Ambient temperature, Ta −°C

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN

13097HA(II)/N3095HA(II) No.5204-1/18

C

°

C

°

LA4587M

Operating Conditions atTa=25°C

Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating supply voltage range V

CC

op 0.95 to 2.2 V

CC

Operation Characteristics atTa=25°C, VCC=1.2V,f=1kHz, 0.775 V = 0 dBm,

=10kΩ(preamplifier), RL=16Ω(power amplifier)

R

L

Parameter Symbol Conditions min typ max Unit

[Preamplifier + Power Amplifier]

I

1 Rg = 2.2 kΩ,Rv=0Ω 81524mA

Quiescent current
Voltage gain (closed) VG

[Preamplifier]
Voltage gain (open) VG

Voltage gain (closed)
Maximum output voltage V

Total harmonic distortion THD
Equivalent input noise voltage V
Interchannel crosstalk CT
Interchannel crosstalk between

F and R
Ripple rejection ratio Rr1
[Low Boost + Power Amplifier]

Voltage gain (closed)

Output power
Total harmonic distortion THD

Interchannel crosstalk CT
Output noise voltage V

Ripple rejection ratio Rr
Output mute voltage V

Input resistance Ri 8 10 12 kΩ
Voltage gain difference ∆VG
[Ripple Filter ]

Ripple rejection ratio Rr
Output voltage V

[AMSS]
Operating output voltage V

CCO

I

2 When power switch is off 0.1 5 µA

CCO

VG
VG

max THD=1% 100 210 mV

O

NI

CT

VO= –20 dBm, RV=10kΩ 54 57 60 dB

T

VO= –20 dBm 60 73 dB

0

VO= –20 dBm 34 35.5 37 dB

1

VO= –20 dBm, f = 10 kHz, metal on 25.5 28 30.5 dB

2

VG = 35.5 dB/NAB, VO= 100 mV 0.1 0.5 %

1

Rg = 2.2 kΩ, BPF: 20 Hz to 20 kHz 1.3 3.0 µV
Rg = 2.2 kΩ, 1 kHz TUNE, VO= –20 dBm 45 56 dB

1

Rg = 2.2 kΩ, 1 kHz TUNE, VO= –20 dBm 65 78 dB

2

Rg = 2.2 kΩ, Vr = –30 dBm,
fr = 100 Hz, 100 Hz TUNE

VG
VG
VG
VG
P

O1

P

O2

NO

M

RF

OAMSS

VO= –20 dBm 20.5 23 25.5 dB

3

VO= –20 dBm, L.B. = on 20.5 23 25.5 dB

4

VO= –20 dBm, L.B. = on,f=10kHz 24.5 27.5 30.5 dB

5

VO= –20 dBm, L.B. = on, f = 100 Hz 30 34 38 dB

6

THD=10% 5 9 mW
THD = 10 %, f = 100 Hz, L.B. = on 13 21 mW
PO= 1 mW 0.5 1.5 %

2

VO= –20 dBm, RV=0Ω 38 43 dB

3

RV=0Ω, BPF: 20 Hz to 20 kHz 35 48 µV
RV=0Ω, Vr = –30 dBm,

2

fr = 100 Hz, 100 Hz TUNE
VIN= –30 dBm, 1 KHz TUNE, mute on –85 dBm

3

fr = 100 Hz, Vr = –30 dBm, VCC= 1.0 V,

3

I

= 25 mA, 2SB1295, hFE6 rank used

RF

VCC= 1.0 V, IRF= 25 mA 0.89 0.93 V

Preout voltage when AMSS VO= 0.6 Vp-p
Pin 34 is short-circuited through 270 kΩ.

1.5 V

45 52 dB

50 74 dB

0 +1.5 dB

33 39 dB

1.80 2.55 3.60 mV

Note: L.B. = Low boost

No.5204-2/18

Block Diagram

LA4587M

Test Circuit Diagram

Unit (resistance: Ω)

Unit (resistance: Ω, capacitance: F)

No.5204-3/18

Sample Application Circuit

LA4587M

Unit (resistance: Ω, capacitance: F)

Note 1: Transistors equivalent to the 2SB1295 with hFE6 rank and upward are recommended.
Note 2: C18, C23, and C26 are oscillation prevention capacitors; a polyester film or ceramic capacitor (which can guarantee the

specified capacitance at operating temperatures) is recommended.

No.5204-4/18

Pin Functions

Pin No. Pin name

45 R.F OUT 1.13

2

POWER OUT1

7

POWER OUTC

13

POWER OUT2

3

POWER NF REF1

9

POWER NF REFC

LA4587M

Unit (resistance:Ω, capacitance: F) * Pin voltage is when VCC= 1.2 V

Pin voltage

[V]

0.6 c A 160 Ω resistor is connected

0.75

Internal equivalent circuit Remarks

between individual outputs
(between pins 2 and 7, and
between pins 13 and 7).

c Each power NF connection

12

POWER NF REF2

4

POWER NF1

8

POWER NFC

11

POWER NF2

510POWER H.P1

POWER H.P2

14 L.P2 0.75

0.75

0.75

c Each power NF connection.

c Grounded to V

1kΩresistor when low boost
is on (pin 41: floating).

c Low boost secondary LP

connection.

REF

through a

Continued on next page.

No.5204-5/18

LA4587M

Continued from preceding page. Unit (resistance: Ω, capacitance: F)

Pin No. Pin name

15 Low Boost NF 0.75

Pin voltage

[V]

Internal equivalent circuit Remarks

c Low boost amplifier NF

connection.

1618POWER IN2

POWER IN1

17 L.P1 0.75

1920NFC2

NFC1

2128PRE NF1

PRE NF2

0.75

0.75

0.75 c Each preamplifier NF

c Each power input connection.
c The input resistance is

10 kΩ.

c An anti-buzz capacitor is built

in.

c Low boost primary LP.

connection.

connection.

c NF requires no capacitor.

2227PRE OUT1

PRE OUT2

0.45

c 200 kΩ is connected

between each output pin and
NF pin.

Continued on next page.

No.5204-6/18