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PDF LA7285 Data sheet ( Hoja de datos )
| Número de pieza | LA7285 | |
| Descripción | VCR Audio Signal Recording and Playback Processor | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number:EN4091
Monolithic Linear IC
LA7285, 7285M
VCR Audio Signal Recording
and Playback Processor
Overview
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.
Package Dimensions
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
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.
unit:mm
3112-MFP24S
[LA7285M]
Specifications
Maximum Ratings at Ta = 25˚C
Parameter
Maximum supply voltage
Pin1 input voltage
Pin1 input current
Allowable power dissipation
Operating temperature
Storage temperatrure
Symbol
VCCmax
VIN1
VIN1
Pd max
Topr
Tstg
DC
Ta≤65˚C
Operating Conditions at Ta=25˚C
Parameter
Recommended supply voltage
Operating supply voltage range
Symbol
VCC
VCCop
Conditions
Conditions
SANYO:DIP24S
SANYO:MFP24S
Ratings
14
+65
±1.5
400
–10 to +65
–55 to +150
Unit
V
Vp-p
mA
mW
˚C
˚C
Ratings
12
8.5 to 12.75
Unit
V
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
1 page  
Pin Function
Pin No.
Function name
1
Head switch1
(high withstand voltage)
2
EQ AMP input and
Head switch2
3 GND
4 EP mode switch1
5 EP mode switch2
6 EQ AMP NFB
LA7285, 7285M
Unit (resistance:Ω)
Internal circuit for pin
Description of function
EE, PB → off, REC → off
On resistance → 20Ω(typ)
Withstand voltage when off → ±45V
(f=80kHz)
Input impendance for playback signal
input from head → 80kΩ (typ)
EE, REC → on
PB → off
On resistance → 5Ω (typ)
GND for pin 1 head switch and
Equalizer Amplifier only
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
7 EQ AMP output
8 LINE AMP PB input
9 ALC FILTER
10 TUNER input
11 GND
Internal
reference
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.
Inputs EE and REC signals.
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
5 Page | ||
| Páginas | Total 7 Páginas | |
| PDF Descargar | [ Datasheet LA7285.PDF ] | |
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