www.pulseeng.com M142.A (2/10)
Suggested Application For LVDS and CML Interface
SPLIT CORE
Current Sense Transformers
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Pin number(s)
1…………….... The positive supply for the line interface module. Connect to +3.3V for PECL application.
2, 3 …………... Di, Di/ : Differential PECL compatible data inputs to the transmitter side of the module. Di, Di/ should be control impedance 100
ohm differential line. If input to Di, Di/ is not PECL compatible Di/, Di should AC coupled with 0.1 uF close to pin 1 and 2 .and
biased up to PECL common mode +2.0 V dc using 50 Ω to pin 1 and pin 2 ( 100 Ω differential).
4,5……………. Signal Gnd: The negative supply for the line interface module. Connect to Gnd for PECL applications.
6 ……………... Vbb : Output ,PECL common mode voltage reference.
7,8 ………….... DO , DO/ : Differential PECL data outputs. Terminate both output with 150 Ω to ground. Traces should be control impedance 100
ohm differential , can be terminated 100 ohms diff. at the receiver chip. If receiver is not PECL input Do and Do/ should be AC
coupled with 0.1 uF close to pin 2 and 3 into 100 ohm differential line .Far end(at receiver chip) Do, Do/ should be terminated with
50 ohms to bias voltage Vbb. (this will terminate differential line into 100 ohm.)
9,10 ………….. R X -, R X + : Transformer coupled differential inputs to receiver section Internally terminated for 150 Ω cable. For single ended
coax applications, R X -should be connected to shield of cable/earth Gnd; R X + should be connected to the center conductor.
Earth Gnd should be AC coupled to DC signal Gnd using a 0.027 µF capacitor, ~500V.
11,12,13,14…. No internal connection to these pins.
15, 16 ……….. T X - , T X + : Transformer coupled differential outputs to 150Ω cable. For coax applications Tx-,should be connected to shield of
cable/earth Gnd; T X + should be connected to the center conductor. Earth Gnd should be AC coupled to DC signal Gnd using a
0.027 µF capacitor, 500V.