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AS2525F 数据表(PDF) 2 Page - ams AG

部件名 AS2525F
功能描述  Single-Chip Handsfree Phone CMOS Integrated Circuit
PDF  28 Pages
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制造商  AMSCO [ams AG]
网页  http://www.ams.com
标志 AMSCO - ams AG

AS2525F 数据表(HTML) 2 Page - ams AG

  AS2525F Datasheet HTML 1Page - ams AG AS2525F Datasheet HTML 2Page - ams AG AS2525F Datasheet HTML 3Page - ams AG AS2525F Datasheet HTML 4Page - ams AG AS2525F Datasheet HTML 5Page - ams AG AS2525F Datasheet HTML 6Page - ams AG AS2525F Datasheet HTML 7Page - ams AG AS2525F Datasheet HTML 8Page - ams AG AS2525F Datasheet HTML 9Page - ams AG Next Button
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Revision 2.1
Page 1 of 27
austriamicrosystems
Key Features
-
Line/speech handsfree circuit, LD/MF repertory dialler,
and tone ringer on one 44 pin CMOS chip
-
Operating range from 15 to 100 mA line current (down
to 5 mA with slightly reduced performance)
-
All significant parameters programmable with external
EEPROM
-
Volume control of receiver signal
-
Handsfree function with enhanced voice switching
-
Low noise (max. -72 dBmp)
-
Unique EMC performance
-
LD/MF switchable dialing with temporary MF mode
-
Repertory dialing with last number redial and memory
dialing (8 x 2 direct and 12 indirect)
-
Call restriction with PIN code
-
Serial interface for EEPROM and LCD driver
-
2-tone/3-tone ringer with ring frequency detection
Package
Available in 44 pin TQFP.
General Description
The AS2525 is a CMOS mixed-mode integrated circuit for
use in feature phones, answering machines and fax
machines. It contains an analogue line interface and
speech circuit for a/b terminals, loudhearing, handsfree,
enhanced LD/MF dialler, tone ringer with dc/dc converter
and serial interface to EEPROM and LCD-driver (AS2591),
all in a 44 pin package. The circuit is fully line powered.
The AS2525 uses an external EEPROM for a 32 digit last
number redial storage and memories for 28 numbers each
containing up to 24 digits/data.
The device provides a volume control for the earpiece and
the loudspeaker. The volume can be controlled by pressing
the [V-]/[V+] keys.
The versatility of the circuit is provided by programming all
parameters through an external EEPROM. This allows easy
adaptation to various PTT requirements worldwide.
Block Diagram
CS
SS
LI
VPP
LS
+
–
+
–
+
–
+
VSS
30
Ω
RI
STB
300
Ω
ZBAL
AGND
VDD
VDD
VDD
–
+
VPP
VPP
M1
M2
M3
M4
LO1
LO2
VSSA
RECI
RECV
RO
NOISE
DET.
LINE
SENSE
PEAK
DET.
VOICE
SWITCHING
PEAK
DET.
DTMF
MELODY
DEBOUNCE
CPU
DIALLER
DC/DC
CONVERTER
OSCILLATOR
KEYSCANNING
CM
KEYBOARD (C1-4/R1-3)
HS
HF
DM/HM
FCI
DPN
LED
DI DO CLK
CS1 CS2
VSS
CI
SUPPLY
VREF
VDD
AGND
AGND
FT2
CBN
FT1
AS2525
3.58
MHz
Single-Chip Handsfree Phone
CMOS Integrated Circuit
AS2525
DATA SHEET



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