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參數資料
| 型號： | AM79D2251VC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 編解碼器 |
| 英文描述： | Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC) |
| 中文描述： | PCM CODEC, PQFP44 |
| 封裝： | PLASTIC, TQFP-44 |
| 文件頁數： | 1/35頁 |
| 文件大小： | 410K |
| 代理商： | AM79D2251VC |
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Pub. #
22829
Rev
: C
Amendment
: /0
Issue Date:
December 1999
Intelligent Access
Voice Solutions
Am79D2251
Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC
)
DISTINCTIVE CHARACTERISTICS
I
High performance digital signal processor
provides programmable control of all major
linecard functions
—
32 and 24 kb/s ADPCM to G726, as well as
A-law/
μ
-law and linear codec
—
Transmit and receive gain
—
Two-wire AC impedance
—
Transhybrid balance
—
Equalization
—
DC loop feeding
—
Smooth or abrupt polarity reversal
—
Loop supervision
—
Off-hook debounce circuit
—
Ground-key and ring-trip filters
—
Ringing generation and control
—
Adaptive hybrid balance
—
Line and circuit testing
—
Tone generation
—
Metering generation at 12 kHz and 16 kHz
—
Envelope shaping and level control
I
Selectable PCM/MPI or GCI digital interfaces
—
Supports most available master clock
frequencies from 512 kHz to 8.196 MHz
I
0 to 70°C commercial operation
— –
40
°
C to 85
°
C extended temperature range
available
I
+3.3 V DC operation
I
Exceeds LSSGR and ITU requirements
I
Supports external ringing with on-chip ring-trip
circuit
—
Automatic or manual ring-trip modes
I
DTMF detection according to Q.24
I
2100 Hz modem tone detection according to V.25
BLOCK DIAGRAM
RC
Networks
and
Protection
A1
B1
A2
B2
Dual
ISLAC
ISLIC
ISLIC
LD1
VREF
7
AGND1
AGND2
RREF
BATP
BATH
Ring-Trip
Sense
Resistors
5
5
BATL
RSHB
RSLB
RSPB
VCCA
4
VCCD
DGND1
DGND2
TSCA/G
DRA/DD
DXA/DU
DCLK/S0
PCLK/FS
MCLK
FS/DCL
CS/RST
DIO/S1
INT
3
P1-P3
7
LD2
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