Sanyo LA7285M Vcr audio signal recording and playback processor Datasheet

Ordering number:EN4091
Monolithic Linear IC
LA7285, 7285M
VCR Audio Signal Recording
and Playback Processor
Overview
Package Dimensions
The LA7285 and LA7285M include on chip all functions
required for the record and playback of VCR audio
signals. In addition, the inclusion of a switching circuit
for switching between tuner and line input in addition to
the circuits provided by earlier ICs makes the LA7285
truly optimal for audio VCR products.
unit:mm
3067-DIP24S
[LA7285]
Funtions
•
•
•
•
•
•
•
•
•
•
Equalizer amplifier
Line amplifier
Recording/playback switch
Recording amplifier
Mute
SP, LP, EP switch
Ripple filter
ALC
Tape head switch
Line/tuner input switch
SANYO:DIP24S
unit:mm
3112-MFP24S
[LA7285M]
Features
• Built-in input switching circuit (for the line and tuner
inputs).
• Smaller package leaves large space for other
components.
• Equalizer input/output capacitors not required.
• Low gain variation eliminates the need for external
ajustment.
• Supply voltage : 9V and 12V operation.
Specifications
Maximum Ratings at Ta = 25˚C
Parameter
Maximum supply voltage
Pin1 input voltage
SANYO:MFP24S
Symbol
VIN1
VIN1
Pin1 input current
Allowable power dissipation
Conditions
Ratings
VCCmax
Pd max
DC
Ta≤65˚C
Unit
14
V
+65
Vp-p
±1.5
mA
400
mW
Operating temperature
Topr
–10 to +65
˚C
Storage temperatrure
Tstg
–55 to +150
˚C
Operating Conditions at Ta=25˚C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCCop
Conditions
Ratings
Unit
12
V
8.5 to 12.75
V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquaters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
53098HA (KT) No.4091-1/7
LA7285, 7285M
Operating Characteristics at Ta=25˚C, VCC=12V, f=1kHz, 0dBV : 1.0 Vrms
Parameter
Symbol
Conditions
Ratings
min
typ
max
Unit
Current consumption (EE)
ICCE
No signal
9.5
13.0
16.5
mA
Current consumption (PB)
ICCP
No signal
9.5
13.0
16.5
mA
Current consumption (REC)
ICCR
No signal
8.0
11.0
14.0
mA
Open-circuit voltage gain
VGOE
VO=–7dBV
66.0
71.0
Equivalent input noise voltage
VNIE
Rg=2.2kΩ, DIN Audio filter
1.2
1.8
µVrms
[Equalizer amplifier]
dB
[Line amplifier]
Voltage gain (PB input)
Voltage gain (EE, LINE input)
Total harmonic distortion
Output noise voltage
Maximum output voltage
Output voltage when ALC is on
VGLP
VGLE,
VGLL
VO=–7dBV
21.0
21.5
22.0
dB
VO=–7dBV
21.0
21.5
22.0
dB
THDL
VNOL
VOML
VO=–7dBV
0.05
0.3
%
Rg=2.2kΩ, DIN Audio filter
–72
–66
dBV
THD=1%
VOA
ALC
VIN=–27dBV
THDA
VIN=–27dBV
Voltage gain (open)
VGOR
Voltage gain (colse)
VGOR
VO=–7dBV
VO=–7dBV
Total harmonic distortion
THDR
Maximum output voltage
VOMR
ALC effect
Distortion when ALC is on
1.5
2.1
–8.0
–7.0
–6.0
dBV
1.0
3.0
dB
0.05
0.6
%
VIN=–27dBV to –7dBV
Vrms
[Recording amplifier]
47.0
52.0
12.5
13.0
13.5
dB
0.1
0.3
VO=–7dBV
THD=1%
1.5
Pin 23 DC voltage
2.5
6.0
Pin 23 DC voltage
0
1.5
2.0
dB
%
Vrms
[Mute circuit]
On voltage
Off voltage
Mute attenuation (PB,EE)
Mute attenuation (REC)
VMON
VMOFF
MP,ME
MR
V
V
80
90
dB
65
75
dB
[EP, LP, SP switch circuit]
EP mode hold voltage
VEE
Pin 21 DC voltage
3.6
6.0
V
LP mode hold voltage
VEL
Pin 21 DC voltage
1.8
2.6
V
SP mode hold voltage
VES
Pin 21 DC voltage
0
1.0
V
VLL
VLT
Pin 22 DC voltage
3.6
6.0
V
Tuner mode hold voltage
Pin 22 DC voltage
1.8
2.6
V
PB mode hold voltage
VLP
Pin 22 DC voltage
0
1.0
V
VRR
VRE
Pin 24 DC voltage
3
0
VCC
1.0
V
Pin 24 DC voltage
[Line/Tuner PB switch circuit]
Line mode hold voltage
[REC, EE switch circuit]
REC mode hold voltage
EE mode hold voltage
V
[Head Select Switch]
RON1
RON2
I1=±1mA
20
30
Ω
Pin 2 on resistance
I2=±1mA
5
10
Ω
Pin 2 input voltage
VIN1
Ta=65˚C, f=80kHz (sin), ILK=10µA
±45
V
Pin 1 on resistance
No.4091-2/7
LA7285, 7285M
Block Diagram
Test Circuit
Unit (resistance:Ω, capacitance:F)
No.4091-3/7
LA7285, 7285M
Switch Operation Table
SW1
SW2
SW3
SW4
SW5
Measure
1
1
2
1
5V
VR
GND
Input
2
VM
GND
VL
ICCE
Test item (symbol)
–
A
ICCP
2
1
1
2
1
GND
GND
GND
–
A
ICCR
2
1
1
2
1
GND
5V
5V
–
A
VGOE
1
2
3
2
1
GND
GND
GND
VIN1
VO1
VNIE
2
1
3
2
1
GND
GND
GND
–
VO1
VGLP, THDL, VOML
2
1
2
2
1
GND
GND
GND
VIN2
VGLE, VGLL
2
1
1
2
1
GND
2.5V, 5V
GND
VIN3, VIN4
VO2
VO2
VNOL
2
1
3
2
1
GND
5V
GND
–
VO2
VOA, ALC, THDA
2
1
3
1
1
GND
2.5V, 5V
GND
VO2
VGOR
2
1
3
2
2
GND
5V
GND
VIN3, VIN4
VIN5
VGOR, THDR, VOMR
MP
2
1
3
2
1
GND
5V
GND
VIN5
VO3
VO3
1
1
1
2
1
5V
GND
GND
VIN1
VO2
MR
2
1
1
2
1
5V
5V
GND
VIN5
VO3
ME
2
1
3
2
1
5V
5V
GND
VIN2
VO2
Sample Application Circuit
Unit (resistance:Ω, capacitance:F)
No.4091-4/7
LA7285, 7285M
Pin Function
Pin No.
Unit (resistance:Ω)
Function name
Internal circuit for pin
Description of function
1
Head switch1
(high withstand voltage)
EE, PB → off, REC → off
On resistance → 20Ω(typ)
Withstand voltage when off → ±45V
(f=80kHz)
2
EQ AMP input and
Head switch2
Input impendance for playback signal
input from head → 80kΩ (typ)
EE, REC → on
PB → off
On resistance → 5Ω (typ)
3
GND
GND for pin 1 head switch and
Equalizer Amplifier only
4
EP mode switch1
5
EP mode switch2
6
EQ AMP NFB
7
EQ AMP output
8
9
LINE AMP PB input
Use to change tape heads and
resonant frequency.
On resistance → 15Ω (typ)
Input impendance → 10kΩ (typ)
(EP mode)
Switches the Playback Equalizer
Amplifier high-region frequency
voltage gain.
On resitatance → 15kΩ (typ)
Input impedance → 10kΩ (typ)
(EP mode)
Equalizer Amplifier negative
feedback pin
Internal
reference
Inputs the playback signal from the
Equalizer Amplifier. Because the
input impedance is as high as 110KΩ,
a 0.1µF ceramic capacitor can be used
for the coupling capacitor on pin 8.
Wave detection is performed when
connected to GND through a
capacitor. In addition, the attack and
recovery time is set by C and R
time constants.
ALC FILTER
Inputs EE and REC signals.
Internal
reference
10
TUNER input
11
GND
The reference input is set by resistors
R1 and R2.
The amplifier gain is fixed at 21.5dB.
In addition, because the input
impedance is as high as 110kΩ, a 0.1µF
ceramic capacitor can be used for the
coupling capacitor on pin 10.
GND for all circuit blocks except the
head switch and Equalizer Amplifier.
Continued to next page.
No.4091-5/7
LA7285, 7285M
Continued from proceeding page.
Pin No.
Function name
Unit (resistance:Ω)
Internal circuit for pin
Description of function
Inputs EE and RE signals.
12
LINE input
13
ALC input wave detection
14
LINE AMP output
Internal
reference
The reference input is set by resistors
R1 and R2.The amplifier gain is fixed at
21.5 dB. In addition, because the input
impedance is as high as 110kΩ, a
0.1µF ceramic capacitor can be used
for the coupling capacitor on pin 12.
Inputs the Line Amplifier output
signal.
The ALC level is set by the resistors
R1 and R2.
Output inpedance → 50Ω (typ)
Inputs the recording signal from Line
Amplifier.
15
REC AMP input
The recording current is set by the
resistors R1 and R2. A coupling
capacitor is unnecessary as pin 15 is
a zero baias input.
LP mode switch
Used to adjust the high-region peaking
frequency during recording amplifier in
LP mode.
On resistance → 15Ω (typ)
Intput inpedance → 50Ω (typ)
17
REC AMP NFB
Recording amplifier negativefeedback input. Used to adjust the
high-region peaking frequency of the
recording amplifier with an L, C, R
network connected to ground.
18
REC AMP output
Output inpedance → 40Ω (typ)
19
Ripple filter
20
Supply voltage (VCC)
VCC max=14V
VCC=8.5V to 12.75V
EP/LP/SP Control
When the voltage on
pin 21 is 3.6V to 6.0V:EP;
when 1.8V to 2.6V:LP;
when 0V to 1.8V:SP
Switch On Pin Number
EP mode:4,5,16
LP mode:16
16
21
Power supply of
each circuit block
Ripple rejection is performed when
connected to GND through an
electrolytic capacitor for the filter.
Continued to next page.
No.4091-6/7
LA7285, 7285M
Continued from proceeding page.
Pin No.
Function name
Unit (resistance:Ω)
Internal circuit for pin
Description of function
22
LINE/TUNER/PB Control
When the voltage on
pin 22 is 3.6V to 6.0V:LINE;
when 1.8V to 2.6V:TUNER
when 0V to 1.0V:PB
23
MUTE Control
When the voltage on
pin 23 is 2.5V to 6.0V:MUTE on;
when 0V to 1.5V:MUTE off
24
REC/EE Control
When the voltage on
pin 24 is 2.5V to VCC:REC;
when 0V to 1.0V:EE
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:
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:
Not impose any responsibilty 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 May, 1998. Specifications and information herein are subject to
change without notice.
PS No.4091-7/7
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