73K324L-28IH データシートの表示（PDF） - TDK Corporation

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73K324L-28IH

CCITT V.22bis, V.22, V.21, V.23, Bell 212A Single-Chip Modem

TDK Corporation 

73K324L

CCITT V.22bis, V.22, V.21, V.23, Bell 212A

Single-Chip Modem

RS-232 INTERFACE

NAME

EXCLK

RXCLK

RXD

TXCLK

TXD

TYPE DESCRIPTION

I

O/Tristate

External Clock. This signal is used in synchronous transmission when the external

timing option has been selected. In the External Timing mode the rising edge of

EXCLK is used to strobe synchronous transmit data available on the TXD pin. Also

used for serial control interface.

Receive Clock Tri-statable. The falling edge of this clock output is coincident with

the transitions in the serial received DPSK/QAM data output. The rising edge of

RXCLK can be used to latch the valid output data. RXCLK will be valid as long as

a carrier is present. In V.23 or V.21 mode a clock which is 16 x 1200/75 or 16 x

300 Hz data rate is output, respectively.

O/ Received Data Output. Serial receive data is available on this pin. The data is

Weak always valid on the rising edge of RXCLK when in Synchronous mode. RXD will

Pull-up output constant marks if no carrier is detected.

O/Tristate

Transmit Clock Tri-statable. This signal is used in synchronous DPSK/QAM

transmission to latch serial input data on the TXD pin. Data must be provided so

that valid data is available on the rising edge of the TXCLK. The transmit clock is

derived from different sources depending upon the Synchronization mode

selection. In Internal Mode the clock is generated internally (2400 Hz for QAM,

1200 Hz for DPSK or 600 Hz for half-speed DPSK). In External Mode TXCLK is

phase locked to the EXCLK pin. In Slave Mode TXCLK is phase locked to the

RXCLK pin. TXCLK is always active. In V.23 or V.21 mode the output is a 16 x

1200/75 or 16 x 300 Hz clock, respectively.

I

Transmit Data Input. Serial data for transmission is input on this pin. In

Synchronous modes, the data must be valid on the rising edge of the TXCLK

clock. In Asynchronous modes (2400/1200/600 bit/s, or 75/300 baud) no clocking

is necessary. DPSK/QAM data must be +1%, -2.5% or +2.3%, -2.5 % in Extended

Overspeed mode.

ANALOG INTERFACE

RXA

I

TXA

O

XTL1

I

XTL2

I/O

Received modulated analog signal input from the phone line.

Transmit analog output to the phone line.

These pins are for the internal crystal oscillator requiring a 11.0592 MHz Parallel

mode crystal. Two capacitors from these pins to ground are also required for

proper crystal operation. Consult crystal manufacturer for proper values. XTL2 can

also be driven from an external clock.

5

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