LA3246 [SANYO]
Stereo Preamplifier for Compact Double Cassette Playback-only Use; 立体声前置放大器，用于紧凑型双卡仅回放应用
| 型号： | LA3246 |
| 厂家： | 
SANYO SEMICON DEVICE |
| 描述： | Stereo Preamplifier for Compact Double Cassette Playback-only Use |
| 文件： | 总13页 (文件大小：442K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Ordering number: EN 2651B
Monolithic Linear IC
LA3246
Stereo Preamplifier for Compact Double Cassette
Playback-only Use
Overview
Package Dimensions
unit : mm
The LA3246 is a stereo preamplifier IC for double cassette
tape playback-only use. The LA3246 is intended for use in
portable radio-cassette tape recorders and tape decks.
3021B-DIP20
[LA3246]
Applications
.
Stereo compact cassette player for playback-only use
Stereo cassette deck player
.
Functions
.
Preamplifier × 2, Mixing amplifier × 1, Electronic switch × 6
SANYO : DIP20 (300 mil)
Features
.
.
On-chip electronic switch for input select (auto reverse or
A deck/B deck select)
On-chip electronic switch for normal/higher dubbing select
and electronic switch for metal/normal tape select
Wide operating voltage range (VCC op = 3.5 to 14 V)
With output MIX pin (for music select control)
Low noise voltage range (VNI = 0.9 µV typ, Rg = 2.2 kΩ
NAB)
.
.
.
.
Can be used in conjunction with the LA3240, 3241, 3242 to
easily make up a doublecassette dubbing system.
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Symbol
V max
CC
Conditions
Ratings
16
Unit
V
Maximum supply voltage
Allowable power dissipation
Operating temperature
Storage temperature
Pd max
Topr
500
–20 to +75
–40 to +125
mW
°C
Tstg
°C
Maxiumum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
6
Unit
V
Recommended supply voltage
Operating voltage range
V
CC
op
V
3.5 to 14
V
CC
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
D3097HA(II)/41594HK/N107TA, TS No.2651-1/13
LA3246
Operating Characteristics at Ta = 25°C, VCC = 6.0 V, RL = 10 kΩ, f = 1 kHz, 0 dB = 0.775 V
Parameter
Quiescent current
Symbol
Icco
Conditions
Nor/Nor speed forward
min
typ
max
12
Unit
mA
mA
dB
dB
%
5
7
Iccs
Metal/High speed forward
7
75
10
85
17
Voltage gain (Open)
VGo
VG
Voltage gain (Closed)
Total harmonic distortion
Maximum output voltage
Crosstalk (between channels)
Crosstalk (between F/R)
Channel balance
Nor/Nor speed, NAB
39.5
40.5
0.03
1.2
65
41.5
0.2
THD
V
= 0.65 V, Nor/Nor speed
O
V
max
THD = 1%, Nor/Nor speed
0.7
50
50
V
O
CT1
CT2
V
V
V
= –5 dBm, Rg = 2.2 kΩ, Nor/Nor speed
= –5 dBm, Rg = 2.2 kΩ, Nor/Nor speed
= –50 dBm
dB
dB
dB
µV
dB
mA
Ω
O
O
IN
65
V
0
2
1.7
+3
BL
Equivalent input noise voltage
MIX output voltage
V
Rg = 2.2 kΩ, B.P.F 20 Hz to 20 kHz, Nor/Nor speed
V 1, V 2 = 0 dBm
0.9
0
NI
V MIX
–3
O
O
O
Ripple filter output current
I
10
15
F OUT
Between P1 to P4 and 5, between pin 16 and 17
Between P1 to P7 and 10, between pin 10 and 14
100
30
250
70
Electronic switch ON-state
resistance
Ron
Ω
DC feedback resistance
Input bias current
R
240
300
0.5
360
3.0
Ω
F
I
µA
F
Pd max – Ta
Ambient temperature, Ta – °C
Equivalent Circuit Block Diagram
Top view
No.2651-2/13
LA3246
Unit (resistance: Ω, capacitance: F)
Note 1. The output frequency characteristic for Nor Tape/High speed mode (pin 6: High, pin 15: Low) and that for Metal
Tape/Nor speed mode (pin 6: Low, pin 15: Low) are set to be the same.
2. Since the input bias current flows out of pins 1, 2 and pins 19, 20, a resistor (recommended value: 30 kΩ to 350 kΩ,
maximum value: 500 kΩ) must be connected a coupling capacitor in series with these pins.
3. *: A capacitor must be connected to the input to absorb a surge.
4. The electronic select switching level is approximately 1/2 × (VCC–0.9).
5. The value of the capacitor connected to pin 12 can be increased/decreased to adjust starting time ts at the time of
application of VCC. (C = 100 µF, ts = 0.4 s.) If the capacitor value is made less than 47 µF, the ripple rejection will get
worse.
6. No capacitor is connected to pin 13. (Even if connected, the ripple can not be rejected.)
7. Extreme caution should be exercised when handling the IC as it is subject to dielectric breakdown.
No.2651-3/13
LA3246
Sample Printed Circuit Pattern (Cu-foiled area)
Unit (resistance: Ω, capacitance: F)
IC Usage Notes
(1) It is recommended to connect a surge absorbing capacitor across input pins 1, 2 and GND and across input pins 19, 20 and
GND.
(2) The base of a PNP transistor is connected to input pins 1, 2 and 19, 20. If an electrolytic capacitor is connected in series with
the input pins, connect input resistor RIN must not exceed 500 kΩ. (Reason: To minimize the variation in output DC voltage
at the time of input switching)
Ω
If a resistor of more than 500 kΩ is connected across input pin and GND, the noise (output) caused by amp 1 and amp 2 select is
liable to increase at the time of F/R switching.
No.2651-4/13
LA3246
(3) When an electrolytic capacitor is connected to input pins 1, 2 (or 23, 24), make the value of RIN1 as equal to that of RIN2 as
possible.
The difference in the value between RIN1 and RIN2 causes the variation in amp output DC voltage at the time of F/R
switching. Therefore, the input DC voltage (voltage across RIN) must be made as equal as possible.
(4) The amplifier output characteristics are designed to be the same in the Nor Tape/High Speed (pin 15 GND/pin 6 VCC) and
Me Tape/Nor Speed (pin 15 VCC/pin 6 GND) modes. (Refer to sample application circuit, external constants.)
(5) When externally turning ON/OFF power supply pin 11 (by bringing pin 11 to +VCC/GND level) with a capacitor connected
to pin 13, connect external diode D, as shown below, so that no breakdown (or deterioration) of the IC system is caused by
ICD when the switch is turned OFF. When no capacitor is connected to pin 13, diode D is not required.
(6) The output MIX circuit is of the emitter follower configuration as shown below.
Unit (resistance: Ω)
The MIX OUT output level VO MIX at the time a signal is applied to preamp1 (or preamp2) only is 1/2 as compared with
output levels VO1, VO2 at the time the same input signal is applied to both channels.
VO MIX = 1/2
VO1(= 1/2 × VO2)
where VO1 = VO2
No.2651-5/13
LA3246
(7) Output waveform starting time
Example of rise waveform at pin 4 (or 17)
When supply voltage VCC is switched ON, the amplifier output (pins 4, 17) will rise. Output waveform ON time ts can be
varied by capacitor Cr connected to pin 12.
Refer to Data Cr – ts.
The minimum value of Cr is 47 µF.
(8) Electronic select switching level
.
The switch level at VCC = 6.0 V is shown below.
Control Current
Switching Level
Mode
typ (flow-in)
(at operation
finish)
Pin
Switch Mode
Clamp Voltage
Operation
Operation Start
(+)
(–)
Finish
6
9
Normal/Metal
Forward/Reverse
Normal/Higher
2.1 V
2.1 V
2.1 V
2.4 V
3.1 V
2.4 V
3.7 V
3.4 V
3.7 V
2 µA
Metal
Reverse
Higher
Normal
Forward
Normal
2 µA
15
2 µA
As shown above, there is a difference in the switching level at three control pins (6, 9, 15) between operation start and
operation finish.
.
Switching level and mode at each pin (experimental value)
Switching level (reverse) on pin 9 at V
CC
= 6.0 V, Ta = 25°C
(Metal) (Higher)
Switching level region at pins 6, 15.
No.2651-6/13
LA3246
.
Control circuit
The control circuit for each CONT pin is configured as shown below. When a voltage more than a given value is applied,
the level on the pin is fixed by clamp diode D1.
Current route
at clamp mode
Control pin
Note: For D1, a Schottky diode is used for pin 9
and a silicon diode is used for pins 6, 15.
Unit (resistance: Ω, capacitance: F)
Description
.
Switching level VSW of the control circuit is fixed by voltage V13 which is 1/2 of the voltage on pin 13.
VSW = 1/2 V13
.
Clamp voltage VCLP at the time a voltage is applied to the CONT pin
VCLP = 1/2 × V13 + VD1 + VBE
1
= 1/2 × V13 + 0.6 (0.3) + 0.6
= 1/2 × V13 + (0.9 or 1.2)
where 0.9 V is for pin 9.
1.2 V is for pins 6, 15.
.
.
The maximum voltage at which the CONT pin is brought to GND level is fixed by the level at which the Q2 is completely
turned OFF.
This level is:
1/2 × V13 – VBE2 = 1/2 × V13 – 0.6 [V]
Switching is performed at a level less than this.
To turn ON/OFF
When turning ON:
To turn ON the control circuit to finish the
operation, I is required. Control voltage
B
VOUT is obtained with IB of 4 µA min.
.
.
VCONT min = R × IB max + Operation finish voltage.
IB = 4 µA
Operation finish voltage
Pins 6, 15 : = 1/2 × V13
Pin 9 :
= 1/2 × V13 + VBE
= 1/2 × V13 + 0.6 [V]
VCONT max = R × IB max + Clamp voltage
R is restricted by IB max.
When the supply voltage is fixed, clamp voltage VCLP is fixed. When resistor R is fixed based on a balance with capacitor C,
resistor R is restricted by VCONT max. as shown below.
VCONT max – VCLP
IB max = 100 µA ^
R
The minimum value of resistor R is fixed by this equation.
Example
Assuming VCC = 10 V, VCONT max = 10 V, Rmin is 50 kΩ.
Therefore, R = 100 kΩ presents no problem.
When turning OFF:
Bring the level on the CONT pin to a level less than:
1/2 × V13 – VBE2 = 1/2 × V13 – 0.6 [V]
No.2651-7/13
LA3246
(9) Example of voltage on each pin
Rg = 2.2 kΩ, Ta = 25°C, V = 0, pins 6, 9 and 15 = GND
IN
Supply voltage, V
– V
CC
Pin
Unit
4.5 V
6.0 V
0.3
9.0 V
0.3
12.0 V
0.3
1
2
0.3
0.3
mV
mV
V
0.3
0.3
0.3
3
0.59
0.58
2.23
2.23
0.57
3.65
3.65
0.56
4
1.63
5.02
V
5
1.63
5.02
V
6
(GND) 0
0
(GND) 0
0
(GND) 0
0
(GND) 0
0
V
7
V
8
1.63
2.29
3.64
5.01
V
9
(GND) 0
(GND) 0
(GND) 0
(GND) 0
(GND) 0
(GND) 0
(GND) 0
(GND) 0
V
10
11
12
13
14
15
16
17
18
19
20
V
V
V
V
V
CC
V
CC
CC
CC
4.48
3.72
0
5.96
5.20
0
8.97
8.21
0
11.23
11.98
0
V
V
V
(GND) 0
1.63
1.63
0.59
0.3
(GND) 0
2.23
2.23
0.58
0.3
(GND) 0
3.65
3.65
0.57
0.3
(GND) 0
5.02
5.02
0.56
0.3
V
V
V
V
mV
mV
0.3
0.3
0.3
0.3
Iccs, Icco – VCC
IB – VCC
Nor/High and Me/Nor SW on: Pins 6 and
15 are brought to supply voltage level.
Supply voltage, VCC – V
Supply voltage, VCC – V
VDC – VCC
VGo, VG – fi
Pin 12
Pin 13
Pins 4, 19
Pins 3,18
Supply voltage, VCC – V
Input frequency, fi – Hz
No.2651-8/13
LA3246
VG – fi
VG – VCC
Input frequency, fi – Hz
Supply voltage, V– V
VO max – VCC
VO, THD – VIN
Supply voltage, V– V
Input voltage, V– dBm
VNO – VCC
CT1 – VCC
CH1 only operated
Supply voltage, VCC – V
Supply voltage, VCC – V
No.2651-9/13
LA3246
CT3 – fi
CT2 – VCC
CT4 – fi
CT5 – fi
c
Input frequency, fi – Hz
Input frequency, fi – Hz
CT6 – fi
CT7 – fi
Input frequency, f– Hz
Input frequency, f– Hz
CT8 – fi
Input frequency, fi – Hz
Signal source resistance, Rg – Ω
No.2651-10/13
LA3246
VNO – Rg
VNI – Rg
Signal source resistance, Rg – Ω
Signal source resistance, Rg – Ω
VGo – VCC
VG – fi
Supply voltage, V– V
Input frequency, f– Hz
Rr –fr
Rr – Cr
Cr = 47 µF or greater
(Pin 12)
Ripple frequency, f– Hz
Capacitor for ripple filter (pin 12), Cr – µF
tS – Cr
tS – CNF
or less
Cr = 47 µF or greater
Capacitor for ripple filter (pin 12), Cr – µF
Reverse transfer capacitance, CNF – µF
No.2651-11/13
LA3246
Ron, V – VCC
Iccs, Icco – Ta
* Me/High SW on: Pins 6, 15 are
brought to supply voltage level.
V : Voltage across 2.7 kΩ resistor
R
VO max – Ta
VG – Ta
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
CT9 – Ta
VBL – Ta
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
IB – Ta
VODC – Ta
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No.2651-12/13
LA3246
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.
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
1 Accept 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:
2 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.
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 December, 1997. Specifications and information herein are subject to change without notice.
No.2651-13/13
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