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PDF LA3235W Data sheet ( Hoja de datos )
| Número de pieza | LA3235W | |
| Descripción | 1.5 V Record Preamplifier | |
| Fabricantes | Sanyo Semicon Device | |
| Logotipo |  |
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Ordering number : EN4530A
Monolithic Linear IC
LA3235W
1.5 V Record Preamplifier
Overview
The LA3235W is a single-chip record system IC for use in
1.5 V headphone stereo products. While previous
recording systems were implemented using a dedicated
tape drive, by using the LA3235W, such a system can be
implemented by adding electronic switching to a
playback-only tape drive. Additionally, a compact
record/playback system can be implemented with just two
chips by combining this IC and the LA4590W 1.5 V
preamplifier/power amplifier IC
Functions
• Microphone amplifier (with ALC) ×2
• Microphone monitor amplifier ×2
• Radio amplifier (with ALC) × 2
• Record bias power supply
• Record amplifier ×4 (with forward/reverse switching
and muting functions)
• Microphone power supply
• All control circuits, including electronic switching
circuits, built in
Features
• Miniature package (48-pin SQFP)
• Built-in microphone and record bias power supplies
• Built-in radio amplifier with ALC circuit
• Systems can be easily controlled from a microprocessor
using the built-in electronic switching, power supply,
and amplifier block control circuits.
Package Dimensions
unit: mm
6134A-SQFP48
[LA3235W]
SANYO: SQFP48
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA (OT) No. 4530-1/13
1 page  
Block Diagram
LA3235W
No. 4530-5/13
5 Page 
Continued form preceding page.
Pin No. Pin Pin voltage (V)
LA3235W
Internal equivalent circuit
Notes
19 NF2
22 NF1
0.8
• Microphone and radio amplifier noise filter
connections
20 MIC IN2
23 MIC IN1
0.8
• Microphone amplifier inputs
• The input resistance is variable over the
range 6.8 to 36.8 kΩ.
26 CONT E
27 CONT D
28 CONT C
VCC2 to 0
• Fixed-current pull-up current sources
Pin 26......................18 µA
Pins 27 and 28........35 µA
29 CONT B
30 CONT A
VCC2 to 0
31 CONT F
VCCRF to 0
• 35-µA fixed-current pull-up current sources
• The pull-up resistor has a value of 100 kΩ
±20%.
Continued on next page.
No. 4530-11/13
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet LA3235W.PDF ] | |
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