Pin Function; Line Interface - NEC UPD98413 User Manual

2.2 Pin Function

2.2.1 Line Interface

The line interface connects with an optical transceiver.
Pin Name Serial No.
TDOT0-3
TDOC0-3
RFCKPLT
RFCKPLC
RFCKTTL
LPFP
LPFPGND
BIASP
CHAPTER 2 PIN FUNCTION
Address No. I/O Level
O
2.5V
Differential
PECL
I
2.5V
Differential
PECL
I
LVTTL
Analog
Analog
Analog
PRELIMINARY
Function
Transmit serial data output pins.
Transmit data is output from these pins.
The differential reference clock inputs.
Inputs the reference clock for both the CDR and the
synthesizer PLL circuits. RFCKPLT must be connected to
a logic one and RFCKPLC to a logic zero state when
RFCKTTL is used.
TTL reference clock input.
TTL reference clock inputs for both the CDR and the
TxPLL circuits. RFCKTTL must be tied high if RFCKPLT/
RFCKLC is used.
Loop Filter Capacitor for synthesizer PLL.
The TxPLL loop filter capacitor is connected to this pin.
Loop Filter Capacitor for synthesizer PLL. (GND)
The TxPLL loop filter capacitor is connected to this pin.
Bias pin for TxPLL
Connects to analog VDD via 1.1KΩ register
NEC confidential and Proprietary
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