ICS1894-32_1 Datasheet, PDF (30/53 Pages) Integrated Device Technology – 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE

ICS1894-32
10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
PHYCEIVER
Recommended Component Values
Parameter
TCSR Resistor Value
Minimum
–
LED Resistor Value
ICS1894-32 TCSR
Typical
1.82k to GND
18.2k to VDD
1k
Maximum
–
Tolerance
1%
–
Units
Ω
Ω
ICS1894CK-32
VDD
7
18.2KΩ 1%
TCSR
8
VDD
1.82KΩ 1%
Note:
1. The bias resistor network sets the 10baseT and 100baseTX output amplitude levels.
2. Amplitude is directly related to current sourced out of the TCSR pin.
3. Resistor values shown above are typical. User should check amplitudes and adjust for transformer effects.
4. The 18.2K resistor provides negative feedback to compensate for VDD changes. Reducing the value of
this resistor will lower the 100baseT amplitude. Reducing the value of the resistor to ground on the other
hand will increase the output signal amplitude.
IDT® 10BASE-T/100BASE-TX INTEGRATED PHYCEIVER WITH RMII INTERFACE
30
ICS1894-32 REV G 020509