AK2504A Datasheet, PDF (14/30 Pages) List of Unclassifed Manufacturers – DS3/STS-1/ES Transceiver

ASAHI KASEI
[AK2504A]
Pulse Shaper
Pulse Shaper generates a waveform meeting the pulse mask such as described in Table 3,4,5.
The input data of Pulse Shaper is the sampled data of TPDATA and/or TNDATA pins on the rising or falling edge
of TCLK. Polarity of TCLK is selected by TCKPOL pin.
Line Built Out
When LBO = High, the transmit pulse is output through LBO circuit which makes transmit pulse filtered with the
frequency response equivalent to the 225ft cable.
Table 6 Transmit Pulse Amplitude (DS3/STS-1)
LBO
Low
Cable Length
225 – 450 ft
DS3, STS-1
1150mVpk(typ)
High
0 – 225ft
800mVpk(typ)
Note; LBO pin is active only with _E3 pin set to High(DS3/STS-1 mode).
Transmit All Ones Select
If TAOS pin is high, continuos AMI 1s are transmitted from TTIP/TRING. While this All 1s pattern is transmitted,
the input data on TPDATA/TNDATA are ignored. In Local Loopback mode (LLOOP pin is high), TAOS request
is accepted and the input data on TPDATA/TNDATA are loopback to RPDATA/RNDATA. In Remote Loopback
mode (RLOOP pin is high), TAOS request is accepted and the recoverd data is output to RPDATA/RNDATA.
Line Short Protect
If Line is short, there is no large current on the transmit output driver because that the driver is a current source
drive type.
MS0143-E-01
- 14 -
2004/01