Sanyo (Now Panasonic) LA3161 Schematics
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
Monolithic Linear IC
2-Channel Preamplifier For Car Stereo
Ordering number:ENN573F
LA3161
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Features
• On-chip 2 preamplifiers.
• Good ripple rejection owing to on-chip voltage regulator.
• Minimum number of external parts required.
• Low noise.
• 8-pin SIP package facilitating easy mounting.
• Pin-compatible with LA3160.
Specifications
Absolute Maximum Ratings at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatloVylppuSmumixaMV
noitapissiDrewoPelbawollAxamdP 002Wm
erutarepmeTgnitarepOrpoT 57+ot02–
erutarepmeTegarotSgtsT 521+ot04–
xam 81V
CC
Package Dimensions
unit:mm
3016B-SIP8
[LA3161]
2.54
22.3
0.5
1.5
1.0
4.8
1
2.26
3.0
5.7max
0.51min
3.2
8
1.3
SANYO : SIP8
0.25
1.35
˚C
˚C
Recommended Operating Conditions at Ta = 25˚C
retemaraPlobmySsnoitidnoCsgnitaRtinU
egatloVylppuSV
ecnatsiseRdaoLR
CC
L
Operating Conditions at Ta = 25˚C, VCC=9V, RL=10kΩ, Rg=600Ω, f=1kHz, NAB
retemaraPlobmySsnoitidnoC
noitapissiDtnerruCI
niaGegatloVGV
egatloVtuptuOV
noitrotsiDcinomraHlatoTDHTVOV5.0=50.003.0%
ecnatsiseRtupnIr
CC
O
i
pooldesolC53Bd
V,poolnepO
V77.0=0787Bd
O
%1=DHT0.13.1V
10700TH (KT)/N0493TH/7160TS/O137KI/8044KI/9250KI, TS No.573–1/7
sgnitaR
nimpytxam
5.60.8Am
k07k001
Continued on next page.
9V
Ω
k01
tinU
Ω
LA3161
Continued from preceding page.
retemaraPlobmySsnoitidnoC
egatloVesioNtupnItnelaviuqEV
klatssorCTCk2.2=gR Ω 05–56–Bd
noitcejeRelppiRrR 04–Bd
IN
k2.2=gR Ω 2.10.2Fµ
Equivalent Circuit Block Diagram
nimpytxam
sgnitaR
tinU
Test Circuit1 : VO, VG, THD, ICC, r
Test Circuit3 : Noise
i
Test Circuit2 : VG
O
No.573–2/7
LA3161
Sample Application Circuit 1 : Preamplifier for Car Stereo
Function of External Parts
C2, C4 are input coupling capacitors. In NAB equalizer amplifier, the gain at low frequencies is high and 1/f noise
inside the IC is emphasized as output noise. Therefore, if the reactance of capacitor at low frequencies is increased,
the dependence of 1/f noise on the signal source resistance causes the output noise voltage to deteriorate, and the
value of reactance must be made small enough as compared with the signal source resistance. C2, C4 also influence
the operation start time and the adequate value of these capacitors is 10µF. (Since C2, C4 of less than 4.7µF make the
operation start time longer, use C2, C4, of 4.7µF or more).
C5, C11 are NF capacitors. The lower cut-off frequency depends on the value of these capacitors.
If the lower cut-off frequency is taken as fL :
C5 (C11) = 1/2π · fL · R2 (R7)
If the value of this capacitor is made larger, the operation start time of amplifier is more delayed. The adequate value
of capacitor is 47µF.
The frequency characteristic of the equalizer amplifier depends on C6 and R4, R3 (C10 and R5, R6).
The time constants to obtain the standard NAB characteristic are as shown below.
Tape speed
)4R+3R(6Csµ0813sµ0951
6C3Rsµ09sµ021
s/mc5.9s/mc57.4
C8 is bias capacitor for the power line. C8 of 47µF is inserted at a point as close to the power supply pin (pin 4) as
possible.
C1, C3 are for preventing radio interference in the strong electric field, interference attributable to engine noise, and
blocking oscillation at the time of large amplitude operation. The adequate value of C1, C3 is approximately 1000pF.
C7, C9 are output coupling capacitors. The adequate value of C7, C9 is 10µF.
No.573–3/7
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