FM209 데이터 시트보기 (PDF) - Conexant Systems

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FM209

9600/14400 bps MONOFAX Modem Family

Conexant Systems 

 

 


Table 3. Turn-On Sequence Times

 




  

  

  

     

     

     

     

    

    

       

     

































≤

≤

Table 4. Turn-Off Sequence Times

 

 



 





 




  

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Notes:

1. In parallel data mode, the turn-off sequence may be

extended by 8 bit times.

2. In HDLC mode, the turn-off sequence may be extended by

more than 8 bit times.

Caller ID Reception

Caller ID reception (CID) allows Customer Premises

Equipment (CPE) to receive a calling party’s directory

number which includes the date and time of the call.

For Type I Caller ID this information is contained in the

first 4-second silent interval in the ring cycle. For Type

II Caller ID support an ACK signal is sent by the CPE

in response to a CAS tone, after which the calling

party information from the Stored Program Control

Switching System (SPCS) can be received by the

CPE.

Tone Generation

The modem can generate voice-band single or dual

tones from 0 Hz to 4800 Hz with a resolution of 0.15

Hz and an accuracy of 0.01%. Tones over 3000 Hz

are attenuated. Dual tone generation allows the

modem to operate as a programmable DTMF dialer.

Tone Detectors

All three tone detectors operate in all receive modes.

The tone detectors can also operate as one 12th order

filter.

The filter coefficients of each filter are host

programmable in RAM. The output of the tone detector

filter goes to an energy detector.

Hardware Interface

The Fax, Digital Telephone Answering Machine

(DTAM), and Speakerphone hardware interface

signals are shown in Figure 1, Figure 2, and Figure 3.

Any point that is active when exhibiting the relatively

more negative voltage of a two-voltage system (0 VDC

for TTL or -12 VDC for EIA/TIA-232-E) is called active

low and is represented by a small circle at the signal

point. Active low signals are indicated by a pound sign

(#), (RESET#).

Edge-triggered clocks are indicated by a small triangle

(DCLK).

A small half circle denotes open-collector (open-

source or open-drain) outputs (signal IRQ#).

A clock intended to activate logic on its rising edge

(low-to-high transition) is called active high, while a

clock intended to activate logic on its falling edge

(high-to-low transition) is called active low. When clock

input is associated with a small circle, the input

activates on a falling edge. If no circle is shown, the

input activates on a rising edge.

The pin assignments for the 128-pin TQFP are shown

in Figure 4.

General Specifications

The modem power and environmental requirements

are listed in Table 5 and Table 6, respectively.

Table 5. Current and Power Requirements

Mode

Option

Current (Typ.)

@25°C

3.3V ± 5%.

DVAA

2.5 ma

VDD

Basic

50 ma

VDD

-V

72 ma

VDD

- VS

80 ma

5V ± 5% VGG

5.5 ma

Basic

.25 ma

-V

.30 ma

- VS

.30 ma

Note: Input Ripple ≤0.1 Vpeak-peak. The

amplitude of any frequency between 20

kHz and 150 kHz must be less than 500

µVpeak.

Table 6. Environmental Requirements

Parameter

Temperature

Operating

Storage

Relative Humidity

Specification

0°C to +70°C (32°F to 158°F)

-55°C to +125°C (-67°F to 257°F)

Up to 90% non-condensing, or a wet bulb

temperature up to 35°C, whichever is less.

6

MD205

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