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參數(shù)資料
| 型號： | AD1801 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Single-Chip Fax/Data/ Voice Modem(單片的傳真/數(shù)據(jù)/語音調(diào)制解調(diào)器) |
| 中文描述： | 單芯片傳真/數(shù)據(jù)/語音調(diào)制解調(diào)器（單片的傳真/數(shù)據(jù)/語音調(diào)制解調(diào)器） |
| 文件頁數(shù)： | 15/52頁 |
| 文件大?。?/td> | 348K |
| 代理商： | AD1801 |
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AD1801
–15–
REV. 0
MIXED SIGNAL FUNCTIONAL DESCRIPTION
FEATURES
Modem AFE
V.34/V.34bis modem codec (Analog Front-End [AFE]) with
1 Hz, 8/7 Hz, and 10/7 Hz programmable sample rates
from 5.4 to 48 kHz, using 64 times oversampled, single-
bit sigma-delta data conversion.
Support for all V.34 symbol and sample rates, including 8/7
and 10/7 symbol rates from single external 16.9344
MHz DSP crystal or clock.
Differential analog I/O to/from modem AFE for highest
signal quality.
Programmable gain amplifier on modem receive ADC
input with 0 dB, +6 dB or +12 dB gain.
Programmable attenuator on modem transmit DAC out-
put, 0 dB to –31 dB with 1.0 dB typical step size.
Handset AFE
Full featured audio/handset codec (AFE) with 1 Hz pro-
grammable sample rates from 5.4 kHz to 48 kHz, using
64 times oversampled, single-bit sigma-delta data con-
version.
Selectable 20 dB gain block for condenser microphones
and selectable line input.
Selectable line output and differential analog output to
handset speaker.
Programmable gain amplifier on ADC input, 0 dB to +22.5 dB
with 1.5 dB typical step size.
Programmable gain amplifier/attenuator on DAC output
+12 dB to –34.5 dB with 1.5 dB typical step size and full
analog mute.
Monitor Speaker DAC
Sixteen word DSP output FIFO to minimize DSP overhead.
Sigma-delta DAC with sample rates tied to either modem
codec or handset codec.
Programmable attenuator on DAC output with 0 dB,
–6 dB or –12 dB attenuation, and full analog mute.
Output buffer to drive 8
V
external monitor speaker.
DIGITAL FUNCTIONAL DESCRIPTION
FEATURES
ADSP-2181 DSP microcomputer core: 16.9344 MHz crystal,
33.8688 MIPS sustained performance.
Internal memory: 4K
3
24 bits boot/program ROM, 16K
3
24 bits of program RAM, 16K
3
16 bits of data RAM, and
a 512
3
8 bits dual port RAM for PCMCIA card configu-
ration (Card Information Structure [CIS]) data tables or
ISA Plug and Play (PnP) resource data.
Host PC bus interface option: 16-bit ISA bus or 16-bit PC-
MCIA PC Card bus.
PC 97 compliant single function Plug and Play (PnP)
option.
PCMCIA PC Card bus interface and multifunction card
configuration controller (PC Card 95 multifunction
compliant).
PCMCIA interface supports two external card function
ports for interfacing to communications ICs, e.g.,
ethernet controllers and ISDN devices.
Five pin synchronous serial port (SPORT) option over the
second external function port for external serial com-
munications with the DSP (communication to modem
and handset ADC and DAC are lost).
Internal DMA controller for handling host PC program
code download and data download/upload operations
into and out of internal DSP memory.
Eight programmable I/O lines under DSP control.
Power management: hardware and software controlled
power-down modes with ring awakening option.
Programmable interrupt requests.
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相關(guān)代理商/技術(shù)參數(shù) |
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