Datasheet Download

Audio Accessory ICs
Preamps with Built-in ALC
BA3308F,BA3308FV
No.11087ECT01
●Description
The BA3308F/FV is a dual preamplifier for recording and playback with ALC (auto level control), developed for stereo radio,
cassette recorders, tape recorders, and other pre amplifiers audio applications.
ALC circuit has a build in rectification circuit with wide adjustable dynamic range, high gain, low distortion amplifiers with
direct coupling and mute circuit, used to cut off pop noise during power on.
Available in SOP14, or SSOP-B14 Packages.
●Features
1) Built-in ALC rectification diode
2) Wide operating power supply voltage range (VCC=4.5~14 V)
3) Low current consumption (IQ=3.5mA)
4) High gain (GVO=80dB)
5) Low distortion (THD=0.1%)
6) Low noise (VNIN=1 μVrms)
7) Input coupling capacitor not needed
8) Good ALC channel balance
9) Built-in power supply mute circuit
10) Dynamic range of ALC can be changed by attaching input resistance.
●Applications
Stereo radio, cassette tape recorders, stereo cassette decks, home stereos, music centers, etc.
●Line up matrix
Part No.
Package
BA3308F
BA3308FV
SOP14
SSOP-B14
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© 2011 ROHM Co., Ltd. All rights reserved.
1/9
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Absolute maximum ratings(Ta=25℃)
Parameter
Symbol
Supply voltage
VCC
BA3308F
Power
dissipation
BA3308FV
Operating temperature
Storage temperature
Limits
Unit
16
V
450*1
350*2
-25~+75
-55~+125
Pd
Topr
Tstg
mW
℃
℃
*1 Reduce by 4.5 mW/C over 25C, when mounted on a 70mm×70mm×1.6mm PCB board.
2
* Reduce by 3.5 mW/C over 25C
●Operating conditions(Ta=25℃)
Parameter
Symbol
Min.
Typ.
Max.
Unit
VCC
4.5
-
14
V
Supply voltage
Note: This IC is not designed to be radiation-resistant.
●Electrical characteristics(Unless otherwise noted, Ta=25℃, Vcc=7.0V, f=1kHz, BPF20~20kHz)
Parameter
Test
Circuit
Fig.17
Symbol
Min.
Typ.
Max.
Unit
IQ
1.5
3.5
4.5
mA
VIN=0Vrms
Open loop voltage gain
GVO
70
80
-
dB
VOUT=-10dBV
Fig.17
Total harmonic distortion
THD
-
0.1
0.3
%
NAB34dB, VOUT=40mVrms
Fig.17
Input resistance
RIN
15
25
45
kΩ
Maximum output voltage
Input conversion noise
voltage
VOM
0.6
1.2
-
Vrms
VNIN
-
1
2
μVrms
ALC
40
45
-
dB
ΔALC
-
0
2.5
dB
VIN=-60dBV,-30dBV
Fig.17
CS
60
75
-
dB
VO=0dBV, NAB 34dB
Fig.17
Quiescent current
ALC range
ALC channel balance
Channel separation
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2/9
Conditions
Fig.17
THD=1%
Rg=2.2kΩ, referenced to NAB 34dB
at 1kHz
Rg=3.9 kΩ, VIN=-70 dBV standard,
THD=3%
Fig.17
Fig.17
Fig.17
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Block diagram
BA3308F/FV
14 N.C.
OUTPUT1 1
GND
2
N.C.
3
ALC
V CC
N.C.
OUTPUT2


ALC
4
5
13 INPUT1
12 N.C.
11 NF1


V cc
6
7
10 NF2
9
INPUT2
8
N.C.
Fig.1
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© 2011 ROHM Co., Ltd. All rights reserved.
3/9
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Electrical characteristic curves (Reference data)
Fig.2 Quiescent current vs.
power supply voltage
Fig.5 Total harmonic distortion vs.
frequency
Fig.8 Input conversion noise voltage
vs. signal source resistance
Fig.11 Input/output characteristics
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Fig.3
Quiescent current vs.
ambient temperature
Fig.6 Voltage gain vs.
supply voltage
Fig.4 Voltage gain vs. frequency
Fig.7 Closed loop voltage gain vs.
ambient temperature
Fig.9 Channel separation vs.
frequency
Fig.10 ALC characteristics
Fig.12 Maximum output voltage vs.
power supply voltage
Fig.13 Maximum output voltage vs.
load resistance
4/9
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Description of operations
1. Recording
1) Record amplifier
BA3308
ch2
(ch1)
Cont
The BA3308F/FV amplifier of ch1 and ch2 input stage
(13pin, 9pin) can be direct coupled or use coupling
capacitors (C1/C2). The voltage gain of the record amplifier
is determined by GV=R5/R3. The R5/R6, and C3/R3 regulate
control of the pop noise that occurs at power-on (see
“Cautions on use”) and direct current bias fed back is set by
R5/R6 and C5/C6 at the output stage.
ch2
(ch1)
ch1
(ch2)
2 (8)
13(9)
R1
(R2)
3.9k
C1
(C2)
10F
1 (9)
11(10)
45
31 (7)
R5
(R6)
18k
R3
(R4)
39
R7
(R8)
1M
C7
(C8)
22F
C5
(C6)
10F
C3
(C4)
100F
INPUT
OUTPUT
Fig.14
Fig.5
2) ALC
The BA3308F/FV has an on-chip signal rectifier and electronic
volume needed for ALC. The signal rectifier compares the direct
current output voltage that is superposed in the output stage (1, 7pin)
signal to the reference voltage 4.5VF (≒3V; 1VF is approximately
0.7V) in the comparator circuit and if the output voltage is higher, it
turns the comparator ON to charge the smoothing capacitor C7.
Since the operation point of the output stage of amplifier ch1 and ch2
is fixed at 3VF, the comparator turns ON when the peak value of the
signal output voltage is 1.5VF (effective value approx. 0.75V). Once
the direct current signal for electronic volume is controlled, ALC
operation starts. The electronic volume, which is connected between
the input line (13, 9pin) and GND, causes the input signal to
attenuate according to the ratio of the external resistance (R1, R2) to
the resistance value of the electronic volume. The ALC range varies
according to the values of R1 and R2. For small ALC variation the
S/N will determinate an adequate ALC range is obtained by applying
several kΩ of the R1 and R2. The attack time and recovery time of
ALC are set according to C7 and R7 of 4pin. If the time constants
(C7, R7) are large, the recovery time will be long and as C7 becomes
smaller, and the attack time will be shorter.
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5/9
ch1
(ch2)
ch2
(ch1)
Comp
ch2
(ch1)
Cont
4.5VF
BA3308
VOUT (DCAC)
1 (7)
4
3 (7)
13(9)
5
2 (8)
3VF
R7
C7
Fig.15
Fig.6
2012.06 - Rev.C
R1
(R2)
Technical Note
BA3308F,BA3308FV
2.
On playback
Since
amplifier ch1 and ch2 are used as a NAB equalizer
.
amplifier at playback, a time constant circuit is established in
the NF section (1-11pin, 7-10pin) to obtain NAB
characteristics. The voltage gain at this time is determined by
the following formula:
GV = │R11+R9/ (│+jωC9・R9)│/R3
Obtain the necessary gain by regulating the (power-on pop
noise prevention) NAB time constant circuit in the same way
when regulating the gain at recording stage. The operating
point of the output stage (1,7pin) is fixed at 3VF.
Accordingly, even if VCC is raised to 5V or more, as in the
VMAX-VCC characteristic (Fig.13), the maximum output voltage
does not rise above 1.2V (Typ.). 4pin is grounded at playback
since ALC is not needed. For better signal-to-noise ratio
characteristics at playback, don’t use R1 and R2, which are
attached to the input pin (13pin, 9pin).
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BA3308
A1
13(9)
2 (8)
11(10)
1 (9)
R3
(R4)
39
C1
(C2)
10μF
R11
(R12)
4.3k
R9
(R10)
120k
C9
0.027μF
(C10)
C3
(C4)
100μF
31 (7)
(7)
45
C5
(C6)
10μF
OUTPUT
INPUT
Fig.16
Fig.7
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Measurement circuit
V
100μF
10k
22k
2
OUTPUT1
1
120k
1.2k
V
SW6A
3
1
10μF
SW2A
V2
33k
INPUT1
30k
SW4A
2
V1
V
39Ω
0.1μF
1M
SW5
VCC
14
2
13
3
22μF
220Ω
1
SW3A
3.9k
SW3B
12
ALC
4
330μF
3.9k
11
5
10
6
9
7
8
0.1μF
1.2k
2
SW4B
30k
33k
1
120k
10μF
39Ω
SW2B
V2
V
10kΩ
3
1
OUTPUT2
SW6B
V
100μF
2.2k
INPUT2
2
V
V1
SW1B
Fig.17
Fig.17
●Application circuit
OUTPUT1
C5
C3
R3
10μF
100μF
39Ω
R5
18kΩ
1
14
2
13
3
12
R1
R7
VCC=7 1MΩ
R8
220Ω
22μF
ALC
4
C7
3.9kΩ
C5
INPUT1
10μF
11
330μF
5
C8
10
R2
6
9
7
8
3.9kΩ
C2
INPUT2
10μF
R6
18kΩ
C6
R4
39Ω
10μF
OUTPUT2
R11 (R12)
4.3kΩ
C4
R9 (R10)
120kΩ
100μF
For playback, connect the following NAB time constant circuit between
C9 (C10)
pins 11 and 1 and pins 10 and 7 in place of R5 and R6.
0.027μF
Fig.18
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7/9
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Notes for use
1) Numbers and data in entries are representative design values and are not guaranteed values of the items.
2) Although ROHM is confident that the example application circuit reflects the best possible recommendations, be sure
to verify circuit characteristics for your particular application. Modification of constants for other externally connected
circuits may cause variations in both static and transient characteristics for external components as well as this Rohm
IC. Allow for sufficient margins when determining circuit constants.
3) Absolute maximum ratings
Use of the IC in excess of absolute maximum ratings, such as the applied voltage or operating temperature range
(Topr), may result in IC damage. Assumptions should not be made regarding the state of the IC (short mode or open
mode) when such damage is suffered. A physical safety measure, such as a fuse, should be implemented when using
the IC at times where the absolute maximum ratings may be exceeded.
4) GND potential
Ensure a minimum GND pin potential in all operating conditions. Make sure that no pins are at a voltage below the
GND at any time, regardless of whether it is a transient signal or not.
5) Thermal design
Perform thermal design, in which there are adequate margins, by taking into account the permissible dissipation (Pd) in
actual states of use.
6) Short circuit between terminals and erroneous mounting
Pay attention to the assembly direction of the ICs. Wrong mounting direction or shorts between terminals, GND, or other
components on the circuits, can damage the IC.
7) Operation in strong magnetic fields
Using the ICs in a strong electromagnetic field can cause operation malfunction.
8) The BA3308F/FV has an on-chip power supply mute circuit that checks for pop noise at power-on. This prevents the
occurrence of pop noise by timing the charge times of the direct current cut capacitors C3 and C4 of 10pin and 11pin,
and of capacitor C8 for the ripple filter of 5pin.
Accordingly, to obtain an adequate effect, it is recommended that the constants of the application circuit be used in C3,
C4, R3, R4, C8, and R8.
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8/9
2012.06 - Rev.C
Technical Note
BA3308F,BA3308FV
●Ordering part number
B
A
3
Part No.
3
0
8
F
Part No.
-
Package
F: SOP14
FV: SSOP-B14
E
2
Packaging and forming specification
E2: Embossed tape and reel
SOP14
<Tape and Reel information>
8.7 ± 0.2
(MAX 9.05 include BURR)
8
Tape
Embossed carrier tape
Quantity
2500pcs
E2
Direction
of feed
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
0.3MIN
4.4±0.2
6.2±0.3
14
1
)
7
1.5±0.1
0.15 ± 0.1
0.4 ± 0.1
0.11
1.27
0.1
1pin
Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
Reel
(Unit : mm)
SSOP-B14
<Tape and Reel information>
5.0 ± 0.2
8
0.3Min.
4.4 ± 0.2
6.4 ± 0.3
14
1
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
7
0.10
1.15 ± 0.1
0.15 ± 0.1
0.65
0.1
0.22 ± 0.1
1pin
Reel
(Unit : mm)
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Direction of feed
∗ Order quantity needs to be multiple of the minimum quantity.
2012.06 - Rev.C
Datasheet
Notice
Precaution on using ROHM Products
1.
Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment,
OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you
(Note 1)
, transport
intend to use our Products in devices requiring extremely high reliability (such as medical equipment
equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car
accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or
serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance.
Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any
damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific
Applications.
(Note1) Medical Equipment Classification of the Specific Applications
JAPAN
USA
EU
CHINA
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅢ
CLASSⅣ
CLASSⅢ
2.
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products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate
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a failure or malfunction of our Products may cause. The following are examples of safety measures:
[a] Installation of protection circuits or other protective devices to improve system safety
[b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure
3.
Our Products are designed and manufactured for use under standard conditions and not under any special or
extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way
responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any
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extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of
product performance, reliability, etc, prior to use, must be necessary:
[a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents
[b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust
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H2S, NH3, SO2, and NO2
[d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves
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[f] Sealing or coating our Products with resin or other coating materials
[g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of
flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning
residue after soldering
[h] Use of the Products in places subject to dew condensation
4.
The Products are not subject to radiation-proof design.
5.
Please verify and confirm characteristics of the final or mounted products in using the Products.
6.
In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse. is applied,
confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power
exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect
product performance and reliability.
7.
De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual
ambient temperature.
8.
Confirm that operation temperature is within the specified range described in the product specification.
9.
ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in
this document.
Precaution for Mounting / Circuit board design
1.
When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product
performance and reliability.
2.
In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the
ROHM representative in advance.
For details, please refer to ROHM Mounting specification
Notice - GE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
Precautions Regarding Application Examples and External Circuits
1.
If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the
characteristics of the Products and external components, including transient characteristics, as well as static
characteristics.
2.
You agree that application notes, reference designs, and associated data and information contained in this document
are presented only as guidance for Products use. Therefore, in case you use such information, you are solely
responsible for it and you must exercise your own independent verification and judgment in the use of such information
contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses
incurred by you or third parties arising from the use of such information.
Precaution for Electrostatic
This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper
caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be
applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron,
isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control).
Precaution for Storage / Transportation
1.
Product performance and soldered connections may deteriorate if the Products are stored in the places where:
[a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2
[b] the temperature or humidity exceeds those recommended by ROHM
[c] the Products are exposed to direct sunshine or condensation
[d] the Products are exposed to high Electrostatic
2.
Even under ROHM recommended storage condition, solderability of products out of recommended storage time period
may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is
exceeding the recommended storage time period.
3.
Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads
may occur due to excessive stress applied when dropping of a carton.
4.
Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of
which storage time is exceeding the recommended storage time period.
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QR code printed on ROHM Products label is for ROHM’s internal use only.
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Other Precaution
1.
This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM.
2.
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3.
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Products or this document for any military purposes, including but not limited to, the development of mass-destruction
weapons.
4.
The proper names of companies or products described in this document are trademarks or registered trademarks of
ROHM, its affiliated companies or third parties.
Notice - GE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
General Precaution
1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents.
ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny
ROHM’s Products against warning, caution or note contained in this document.
2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior
notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s
representative.
3.
The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all
information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or
liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or
concerning such information.
Notice – WE
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Rev.001
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