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Ordering number : EN5661
Monolithic Linear IC
LA4585M
3-V Preamplifier + Power Amplifier for
Headphone Stereo Products
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 )
• 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
[LA4585M]
Ambient temperature, Ta – °C
SANYO: QFP36
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
Maximum supply voltage
Allowable power dissipation
VCC max
Pd max
Operating temperature
Topr
Storage temperature
Tstg
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCCop
Conditions
Conditions
Ratings
4.5
375
–20 to +75
–40 to +150
Unit
V
mW
°C
°C
Ratings
3.0
1.8 to 3.6
Unit
V
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
73097HA(OT) No. 5661-1/5

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LA4585M
Operating Characteristics at Ta = 25°C, VCC = 3.0 V, fi = 1 kHz, 0.775 = 0 dBm, preamplifier RL = 10 k,
low boost, power amplifier RL = 10
Parameter
Symbol
Conditions
[PRE + LOW BOOST + PVSS + PWR]
Quiescent current
Voltage gain (closed loop)
[PRE AMP]
ICCO1
ICCO2
VGT
Rg = 2.2 k, low boost off, PVSS off
Rg = 2.2 k, low boost on, PVSS on
VO = –5 dBm
Voltage gain (open loop)
Voltage gain (closed loop)
Maximum output voltage
Total harmonic distortion
Equivalent input noise voltage
Crosstalk
VG0
VG1
VO max1
THD1
VNI
CT1
VO = –5 dBm
VO = –5 dBm
THD = 1 %, VCC = 1.8 V
VO = 0.2 V, VG = 40 dB/NAB
Rg = 2.2 k, BPF = 20 Hz to 20 kHz
Rg = 2.2 k, TUNE 1 kHz
Ripple rejection ratio
SVRR
Rg = 2.2 k, VCC = 1.8 V, Vr = –20 dBm,
fr = 100 Hz
[POWER AMP]
Output voltage
Voltage gain
Total harmonic distortion
Interchannel crosstalk
Output noise voltage
Ripple rejection ratio
Input resistance
PO
VG2
THD2
CT2
VNO1
Rr2
Ri
THD = 10 %
VO = –5 dBm
PO = 1 mW
VO = –5 dBm, RV = 0
RV = 0 , BPF = 20 Hz to 20 kHz
RV = 0 , Vr = –20 dBm,
fr = 100 Hz, VCC = 1.8 V
DC offset voltage
[LOW BOOST]
VODC OFF Between pin 6 and pins 4 and 8
Voltage gain
VG3 Vi = –30 dBm, boost on/off
Boost*
BST1 ViBST = –30 dBm, f = 100 Hz, boost on
BST2 ViBST = –30 dBm, f = 10 kHz, boost on
Maximum output voltage
VO max2 THD = 1%, boost on
Total harmonic distortion
THD3 VO = 0.1 V, boost on
Interchannel crosstalk
CT3 VO = –20 dBm, Rg = 0, boost on
Output noise voltage
VNO2 Rg = 0, BPF = 20 Hz to 20 kHz, boost on
Ripple rejection ratio
Rr3
Rg = 0, fR = 100 Hz, VR = –20 dBm,
VCC = 1.8 V, boost on
[LOW BOOST + PVSS + POWER] The following items are measured at an RV of 10 kmaximum.
Voltage gain
VG4 Vi = –40 dBm, f = 1 kHz, boost off/on
LOW BOOST output voltage
LOW BOOST output voltage
LOW BOOST total harmonic distortion
VO1
VO2
THD4
Vi = –43 dBm, f = 100 Hz, boost on
Vi = –28 dBm, f = 100 Hz, boost on
Vi = –40 dBm, f = 100 Hz, boost on
Output noise voltage
VNO3
Rg = 0, CCIR-ARM, boost off, with the power
input switch K18 set to B.
PVSS voltage
PVSS width
VO3
WPVSS
Vi = –40 dBm, PVSS 2
The input amplitude between the start point and
the point where the output is +4 dB. PVSS on
PVSS harmonic distortion
THD5 Vi = –40 dBm, PVSS 2
PVSS start input level
VOPi PVSS 2
Ratings
min typ
12 15
12 15
62 64
70 83
40
0.1 0.2
0.05
1.3
60 80
40 50
23
27
30
45
22
–90
–2.3
11.2
7.0
0.25
25
45
34
29
0.4
40
25
55
30
–3.8
14.7
8.5
0.4
0.1
32
2.0
53
22
0.13
0.25
–88
–40
30
–67
24
0.23
0.40
0.5
–85
–37
40
0.5
–63
Unit
max
21 mA
21 µA
67 dB
dB
dB
V
0.5 %
2.0 µV
dB
dB
32
1.0
40
38
+90
–5.3
18.2
10
0.5
5.0
mW
dB
%
dB
µV
dB
k
mV
dB
dB
dB
V
%
dB
µV
dB
27
0.33
0.55
1.2
–82
–34
1.2
–59
dB
V
V
%
dBm
dBm
dB
%
dBm
Note: *The amount of boost for a 1-kHz input.
No. 5661-2/5

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Block Diagram
LA4585M
Low
boost
Sys.
cont
No. 5661-3/5

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Test Circuit Diagram
LA4585M
Low
boost
Sys.
cont
No. 5661-4/5

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Sample Application Circuit
LA4585M
Low
boost
Sys.
cont
The use of polyester film or ceramic
capacitors is recommended. However,
capacitors whose capacitances are
guaranteed for the operating temperature
range of the end product should be used.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
ΠAccept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied
regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of July, 1997. Specifications and information herein are subject to change
without notice.
No. 5661-5/5