SANYO LA4585M Datasheet

Overview

The LA4585M is a preamplifier plus power amplifier IC
that supports auto-reverse and was developed for use in
3-V headphone stereo products.

Features

• The LA4585M is designed for use in playback-only
compact cassette players. In addition to preamplifier and
power amplifier functions, the LA4585M also provides
low boost and automatic power output limiter
(PVSS:Peak Volume Select System) functions.

• Provided in a mini-flat 36-pin quad package (0.65 mm
lead pitch) optimal for miniature end products.

• Two auto-reverse playback preamplifiers

• Two headphone power amplifiers (16 Ω)

• Low boost function (auto-loudness effect)

• Output limiter function (PVSS)

• Two radio input switches (pre-muting switches)

• Power muting switch

Package Dimensions

unit: mm

3162B-QFP36

Monolithic Linear IC

Ordering number : EN5661

73097HA(OT) No. 5661-1/5

SANYO: QFP36

[LA4585M]

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

3-V Preamplifier + Power Amplifier for

Headphone Stereo Products

LA4585M

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage V

CC

max 4.5 V
Allowable power dissipation Pd max 375 mW
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +150 °C

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Recommended supply voltage V

CC

3.0 V

Operating supply voltage range V

CC

op 1.8 to 3.6 V

Operating Conditions at Ta = 25°C

Ambient temperature, Ta – °C

Allowable power dissipation, Pd max – mW

No. 5661-2/5

LA4585M

Parameter Symbol Conditions

Ratings

Unit

min typ max

[PRE + LOW BOOST + PVSS + PWR]

Quiescent current

I

CCO

1 Rg = 2.2 kΩ, low boost off, PVSS off 12 15 21 mA

I

CCO

2 Rg = 2.2 kΩ, low boost on, PVSS on 12 15 21 µA

Voltage gain (closed loop) VG

TVO

= –5 dBm 62 64 67 dB

[PRE AMP]

Voltage gain (open loop) VG

0VO

= –5 dBm 70 83 dB

Voltage gain (closed loop) VG1 V

O

= –5 dBm 40 dB

Maximum output voltage V

O

max1 THD = 1 %, VCC= 1.8 V 0.1 0.2 V

Total harmonic distortion THD1 V

O

= 0.2 V, VG = 40 dB/NAB 0.05 0.5 %

Equivalent input noise voltage V

NI

Rg = 2.2 kΩ, BPF = 20 Hz to 20 kHz 1.3 2.0 µV

Crosstalk CT1 Rg = 2.2 kΩ, TUNE 1 kHz 60 80 dB
Ripple rejection ratio SVRR

Rg = 2.2 kΩ, V

CC

= 1.8 V, Vr = –20 dBm,

40 50 dB

fr = 100 Hz

[POWER AMP]

Output voltage P

O

THD = 10 % 23 34 mW

Voltage gain VG2 V

O

= –5 dBm 27 29 32 dB

Total harmonic distortion THD2 P

O

= 1 mW 0.4 1.0 %

Interchannel crosstalk CT2 V

O

= –5 dBm, RV= 0 Ω 30 40 dB

Output noise voltage V

NO

1 RV= 0 Ω, BPF = 20 Hz to 20 kHz 25 40 µV

Ripple rejection ratio Rr2

R

V

= 0 Ω, Vr = –20 dBm,

45 55 dB

fr = 100 Hz, VCC= 1.8 V

Input resistance Ri 22 30 38 kΩ
DC offset voltage V

ODC OFF

Between pin 6 and pins 4 and 8 –90 +90 mV

[LOW BOOST]

Voltage gain VG3 Vi = –30 dBm, boost on/off –2.3 –3.8 –5.3 dB
Boost*

BST1 Vi

BST

= –30 dBm, f = 100 Hz, boost on 11.2 14.7 18.2 dB

BST2 Vi

BST

= –30 dBm, f = 10 kHz, boost on 7.0 8.5 10 dB

Maximum output voltage V

O

max2 THD = 1%, boost on 0.25 0.4 V

Total harmonic distortion THD3 V

O

= 0.1 V, boost on 0.1 0.5 %

Interchannel crosstalk CT3 V

O

= –20 dBm, Rg = 0, boost on 25 32 dB

Output noise voltage V

NO

2 Rg = 0, BPF = 20 Hz to 20 kHz, boost on 2.0 5.0 µV

Ripple rejection ratio Rr3

Rg = 0, f

R

= 100 Hz, VR= –20 dBm,

45 53 dB

VCC= 1.8 V, boost on

[LOW BOOST + PVSS + POWER] The following items are measured at an R

V

of 10 kΩ maximum.
Voltage gain VG4 Vi = –40 dBm, f = 1 kHz, boost off/on 22 24 27 dB
LOW BOOST output voltage V

O

1 Vi = –43 dBm, f = 100 Hz, boost on 0.13 0.23 0.33 V

LOW BOOST output voltage V

O

2 Vi = –28 dBm, f = 100 Hz, boost on 0.25 0.40 0.55 V

LOW BOOST total harmonic distortion THD4 Vi = –40 dBm, f = 100 Hz, boost on 0.5 1.2 %
Output noise voltage V

NO

3

Rg = 0, CCIR-ARM, boost off, with the power

–88 –85 –82 dBm

input switch K18 set to B.

PVSS voltage V

O

3 Vi = –40 dBm, PVSS 2 –40 –37 –34 dBm

PVSS width W

PVSS

The input amplitude between the start point and

30 40 dB

the point where the output is +4 dB. PVSS on

PVSS harmonic distortion THD5 Vi = –40 dBm, PVSS 2 0.5 1.2 %
PVSS start input level V

OPi

PVSS 2 –67 –63 –59 dBm

Operating Characteristics at Ta = 25°C, VCC= 3.0 V, fi = 1 kHz, 0.775 = 0 dBm, preamplifier RL= 10 kΩ,
low boost, power amplifier RL= 10 Ω

Note: *The amount of boost for a 1-kHz input.