LA3161 - ON Semiconductor

LA3161
Monolithic Linear IC
2-Channel Preamplifier
for Car Stereo
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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
SIP8 22x4.5 / SIP8
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter
Maximum Supply Voltage
Allowable Power Dissipation
Symbol
Conditions
Ratings
Unit
VCC max
18
V
Pd max
200
mW
Operating Temperature
Topr
20 to 75
C
Storage Temperature
Tstg
40 to 125
C
Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed,
damage may occur and reliability may be affected.
Recommended Operating Conditions at Ta = 25C
Parameter
Supply Voltage
Load Resistance
Symbol
Conditions
Ratings
Unit
VCC
9
PL
10k
V

Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended
Operating Ranges limits may affect device reliability.
Electrical Characteristics at Ta = 25C, VCC = 9V, RL = 10k, Rg = 600, f = 1kHz, NAB
Ratings
Parameter
Symbol
Conditions
Unit
min
Current Dissipation
ICC
Voltage Gain
VG
typ
6.5
Closed loop
Output Voltage
Total Hamonic Distortion
Input Resistance
max
8.0
mA
35
dB
Open loop, VO = 0.77V
70
78
dB
VO
THD = 1%
1.0
1.3
V
THD
VO = 0.5V
70k
100k
0.05
ri
Equivalent Input Noise Voltage
VNI
Rg = 2.2k
Crosstalk
CT
Rg = 2.2k
Ripple Rejection
Rr
1.2
50
0.30
%
2.0
F

65
dB
40
dB
Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be
indicated by the Electrical Characteristics if operated under different conditions.
ORDERING INFORMATION
See detailed ordering and shipping information on page 7 of this data sheet.
© Semiconductor Components Industries, LLC, 2014
August 2014 - Rev. 0
1
Publication Order Number :
LA3161/D
LA3161
Package Dimensions
unit : mm
SIP8 22x4.5 / SIP8
CASE 127AG
ISSUE O
Block Diagram
VCC
4
INPUT1
NF1
1
2
3
AMP1
OUTPUT1
Requlated
Voltage Circuit
INPUT2
NF2
8
7
AMP2
6
OUTPUT2
5
GND
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2
LA3161
Test Circuit2 : VGO
Test Circuit1 : VO, VG, THD, ICC, ri
Test Circuit3 : Noise
Sample Application Circuit 1 : Preamplifier for Car Stereo
150Ω
VCC = 13.2V
+ R1
C8
47μF
16V
C5
47μF
6.3V
CH1
IN
CH2
IN
C2
10μF 10V 4
+
1
C1
1000pF
C4
10μF 10V
+
8
C3
1000pF
R2
100kΩ R4
100kΩ
+ R3
OUT
C7
10μF 10V
+
7.5kΩ
2
0.015μF
C6
GND
C9
10μF
+ 10V
CH1
OUT
R5
100kΩ
3
C10
5
6
+ C11
C9
10μF 10V
+
R6
7.5kΩ
OUT
C7
10μF
+ 10V
R1
150Ω
R4
100kΩ
C8
47μF 16V
+
LA3161
7 R60.015μF
7.5kΩ
VCC
0.015μF
C10
R3
7.5kΩ
0.015μF
C6
CH2
OUT
47μF 100kΩ
6.3V
R5
R7
100kΩ
8 7
+
C11
47μF
6.3V
6
5
+
100kΩ
R7
R2
C4
10μF
10V
IN
C2
10μF
10V
+
C3
1000pF
3
2 1
100kΩ
+
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4 3
LA3161
GND
C1
1000pF
IN
C5
47μF
6.3V
LA3161
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 10F. (Since C2, C4 of less than 4.7F make the
operation start time longer, use C2, C4, of 4.7F 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) = 1/2 · 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 47F.
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
C6 (R3  R4)
R3 C6
9.5cm/s
4.75cm/s
3180s
1590s
90s
120s
C8 is bias capacitor for the power line. C8 of 47F 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 10F.
NAB element and determination of gain
Since the DC feedback is provided by R1, R2 of NAB element, which brings about DC output potential at pins 3, 6, it
is impossible to change the value of R1, R2 of NAB element greatly. Therefore, when determining the gain, change
RNF with R1, R2, C1 (NAB element) kept constant.
(1) How to obtain RNF
Impedance Z of NAB element is
1
Z=
+ R2
1/R1 + jC1
 1 + jC1{R1 R2/(R1 + R2)}

= (R1 + R2) 
1 + jC1R1


For a general negative feedback amplifier circuit, A = Ao/ (1 + Ao) applies, and Z = A · RNF is obtained under
conditions of Ao>>A, A>>1 (= RNF/ (RNF + Z), Ao = open-loop gain, A = feedback gain).
Therefore, we can use an approximation of RNF = Z/A.
A = (VG for 1kHz) times, (Set R1, R2 at approximately 100k)
Each time constant of NAB characteristic.
Tape speed
T1 C1, R1
T2 C1 (R1//R2)
9.5cm/s
4.75cm/s
3180s
1590s
90s
120s
(2) Examples of NAB Constants
(a) Tape speed : 9.5cm/s. (8 tracks)
VG : RNF (VG/f = 1kHz)
VG
30
35
40
dB
RNF
180
100
56

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4
LA3161
(b) Tape speed : 4.75cm/s. (cassette)
VG : RNF
VG
30
35
40
dB
RNF
440
240
130

(c) Flat amplifier
VG : RNF
VG
30
35
40
dB
RNF
3.2
1.8
1
k
Proper cares in using IC
1. Maximum Rating
If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum
rating to be exceeded, thereby leading to a breakdown. Allow an ample margin of variation for supply voltage, etc.
and use the IC in the range where the maximum rating is not exceed.
2. Short between pins
If the supply voltage is applied when the space between pins is shorted, a breakdown or deterioration may occur.
When installing the IC on the board or applying the supply voltage, make sure that the space between pins is not
shorted with solder, etc.
3. Breakdown of IC attributable to inverted insertion
If the IC is inserted inversely and operated, the IC may suffer from something unusual, thereby leading to a breakdown or
deterioration of the IC. When installing the IC on the board or operating the IC, check the marked surface of IC.
Proper cares to be taken for obtaining optimum operation of IC
 Set DC resistance of R1, R2 of NAB element at approximately 100k.
 Determine the gain by changing RNF without chaging NAB constant (Refer to Examples of NAB constant.).
VG -- f
VO -- Vi
5
90
VCC = 9V
RL = 10kΩ
Rg = 600Ω
VG = 35dB / 1kHz
3
80
1k
10
Hz
10
kH
z
0H
z
7
Voltage gain,VG --db
1.0
5
3
ort)
F (100Ω sh
00μ
)
ort
CNF
sh
Ω
0
(10
μF
47
=1
f=
Output voltage, VO -- V
2
VCC = 9V
RL = 10kΩ
Rg = 600Ω
W
ith
ou
tN
FB
2
0.1
70
60
W
ith
50
NF
40
B
7
(N
AB
)
5
9.5cm/s
ec
30
3
5
0.1
2 3
5
5
2 3
1.0
2 3
10
Input voltage, Vi -- mV
100
JK316108
5
3
2
5
f
3
100Hz
= 10kH
z
1.0
1kHz
2
0.1
5
3
5
7
0.1
2
3
5
2 3 5
100
7
Output voltage, VO -- V
1.0
2
1K
2 3 5
10K
5 100K
JK316109
2 3
VNI -- Rg
3
VCC = 9V
RL = 10kΩ
Rg = 600Ω
VG = 35dB / 1kHz
10
2 3 5
Frequency, f -- Hz
THD -- VO
3
2
Total Harmonic distortion, THD -- %
20
5
Equivalent input noise voltage, VNI -- μV
2
2
INPUT
Rg
10
VCC = 9V
RL = 10kΩ
5
3
2
1.0
7
5
3
5
7
1
2
3
5
7 10
2
3
5
Signal source resistance, Rg -- kΩ
JK316110
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5
OUTPUT
15Hz to 30kHz
VG = 45dB
VG = 35dB
7
FILTER
Amp
FLAT
Amp
LA3161
7 100
2
JK316111
LA3161
Cross Talk -- f
VCC = 9V
VO = 0dBm
-30
Crosstalk
level
RL
10kΩ
-50
2 3 5
100
1K
2 3 5
100K
JK316112
VGo, ICC -- VCC
RL = 10kΩ
f = 1kHz
Rg = 600kΩ
VG = 35dB
Current dissipation, ICC -- mA
9
8
ICC
74
5
70
4
68
3
66
2
64
1
62
4
6
8
10
12
16
14
1.8
Output voltage, VO -- V
1.6
1.4
10
9
8
74
IC
C
72
70
66
-40
0.8
0.6
7
6
VCC = 9V
RL = 100kΩ
Rg = 600Ω
VG = 35dB / 1kHz
-20
5
0
20
40
60
80
Ambient temperature, Ta -- °C
100
JK316115
VO -- Ta
VCC = 9V
RL = 10kΩ
Rg = 600Ω
f = 1kHz
VG = 35dB / 1kHz
1.6
1.0
12
76
1.8
1.2
100K
JK316113
VGo
78
JK316114
RL = 10kΩ
f = 1kHz
Rg = 600Ω
VG = 35dB
VO (THD = 1%)
2 3 5
11
68
VO -- VCC
2.0
10K
80
60
20
18
Supply voltage, VCC -- V
2 3 5
1K
VGo, ICC -- Ta
76
72
2
2 3 5
100
82
78
6
0
2 3 5
Frequency, f -- Hz
80
VGo
7
0
2
10
2 3 5
10K
Frequency, f -- Hz
10
5
1.4
)
1.2
=
HD
Vo
1.0
1%
(T
0.8
0.4
0.6
0.2
0
2
4
6
8
10
12
14
16
18
Supply voltage, VCC -- V
0.015μF
0.033μF
30
7.5kΩ 100kΩ
47μF
(8 tracks)
RNF
25
20
3
5
7
100
2
3
Feedback resistance, RNF -- Ω
5
40
60
80
100
JK316117
VG -- RNF
40
35
LA
3161
30
VCC
OUTPUT
10μF
20
7
1K
JK316118
47μF
INPUT
10μF
100kΩ
47μF
RNF
25
2
20
45
7.5kΩ 100kΩ
47μF
RNF
(Cassette)
35
0
50
45
40
-20
Ambient temperature, Ta -- °C
VG -- RNF
50
Voltage gain, VG -- dB
0.4
-40
20
JK316116
Voltage gain, VG -- dB
0
2
3
5
7
1K
2
3
Feedback resistance, RNF -- Ω
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6
5
7
10K
JK316119
4
Current dissipation, ICC -- mA
2 3 5
7
Voltage gain, VGo -- dB
-70
10
100
3
Voltage gain, VGo -- dB
-60
VCC = 9V
RL = 10kΩ
Rg = 2.2kΩ
Vo = 0dBm / 0.775V
Output voltage, VO -- V
Crosstalk, CT -- dB
-40
VCC = 9V
RL = 10kΩ
Rg = 600Ω
VG = 35dB / 1kHz
VO = 0dBm
2
RL
10kΩ
LA3161
Rg
2.2kΩ
ri -- f
3
Input resistance, ri -- k Ω
-20
LA3161
VO -- RDC
1.6
VCC = 9V
RL = 10kΩ
f = 1kHz
THD = 1%
Output voltage, VO -- V
1.4
1.2
1.0
0.8
10μF
0.6
INPUT
VCC
OUTPUT
10μF
47μF
0.4
0.2
40
47μF
LA
3161
RDC
10kΩ
100Ω
60
80
100
120
140
Feedback resistance, RDC -- kΩ
160
JK316120
ORDERING INFORMATION
Device
LA3161-E
Package
Shipping (Qty / Packing)
SIP8 22x4.5 / SIP8
(Pb-Free)
25 / Fan-Fold
ON Semiconductor and the ON logo are registered trademarks of Semiconductor Components Industries, LLC (SCILLC) or its subsidiaries in the United States
and/or other countries. SCILLC owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of
SCILLC’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf . SCILLC reserves the right to make changes without
further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose,
nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including
without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can
and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each
customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. SCILLC products are
not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or
sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
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directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was
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