CH224ATF Просмотр технического описания (PDF) - Cermetek Microelectronics
Номер в каталоге
Компоненты Описание
Список матч
CH224ATF Datasheet PDF : 13 Pages
| |||
Cermetek Microelectronics, Inc.
Transmit Level
The transmit level is –10 dBm +1 dB (at TIP and
RING).
Answer Tone: An answer tone of 2100 Hz
(V.22bis, V.22, or T.30) or 2225 Hz (Bell 212A
or 103) is generated.
Guard Tone: An 1800 Hz guard tone can be
generated in all data modes.
Calling Tone: A 1100 Hz (0.5 seconds on, 3
seconds on, 3 seconds off) calling tone (T.30) is
generated in the originate fax mode.
Receive Level
The receiver satisfies performance rquirements
for a received signal from –9 dBm to –43 dBm.
The carrier detect is ON at –43 dBm and OFF at
–48 dBm with a minimum of 2 dB hysteresis.
Receiver Tracking
The modem can accommodate carrier
frequency offset up to +7 Hz, and a transmit
timing error of + 0.01% (V.22 bis or V.27 ter) or
+ 0.02% (V.22 or Bell 212A).
Low Power Sleep Mode
To conserve power, the CH224ATF is
configured for idle (power down) mode. Idle
mode is entered whenever the modem is
inactive beyond the time value specified by S24.
The idle mode allows reduced power
consumption with automatic recovery without
additional circuitry. The modem exits Idle mode
and returns to full operation whenever a ring
signal occurs, the DTE writes to the modem
(parallel interface), or ~DTR or ~TXD is asserted
(serial interface).
HARDWARE INTERFACE
Serial/Indicator Interfaces
A DTE serial interface and indicator output are
supported.
Serial Interface. A TTL logic serial interface to
the DTE is supported.
LED indicator interface. Four direct connect
LED indicator outputs are supported.
CH224ATF Complete 2400 bps Modem Module
Speaker Interface
A speaker output, controlled by AT or V.25 bis
commands, is provided for an optional OEM-
supplied speaker circuit.
Line Interface
The CH224ATF connects to the telco line via tip
and ring signals.
LOW POWER MODES
Sleep mode
Entry. The modem will enter the low power
sleep mode when no line connection exists and
no host activity occurs for the period of time
specified in the S24 register. All device circuits
are turned off except the internal MCU clock
circuitry in order to consume lower power, but
are able to immediately wake up and resume
normal operation.
Wake-up. Wake-up occurs when a ring signal
occurs, or the DTE sends a character to the
modem.
HARDWARE INTERFACE SIGNALS
The SocketModem pin assignments for serial
TTL interface selected are shown in Figure 2
and are listed in Table 7.
The SocketModem hardware interface signals
are defined in Table 9.
The digital electrical characteristics for the
hardware interface signals are listed in Table
10.
The analog electrical characteristics for the
hardware interface signals are listed in Table
11.
The current absolute maximum ratings are listed
in Table 13.
2001 Cermetek Microelectronics, Inc.
Page 5
Document No. 607-0005 Revision B1 (05/02)
Share Link: 