MTC-20144TQ-I AMI Semiconductor, Inc., MTC-20144TQ-I Datasheet - Page 7

• Manufacturer Part Number: MTC-20144TQ-I
• Description: Integrated ADSL CMOS Analog Front-End Circuit
• Manufacturer: AMI Semiconductor, Inc.

ATU_C Side Block
Diagram
The transformer at ATU_C-side has 1:2
ratio. The termination resistors are
12.5Ω. in case of 100Ω lines.
The hybrid bridge resistors should be <
2.5 kΩ for low-noise.
An HP filter must be used on the TX path
to reduce DMT sidelobes and out of
band noise influence on the receiver.
On the RX path, a LP filter must be used
in order to reduce the echo signal level
and to avoid saturation of the input
stage of the receiver.
The POTS filter is used in both direction
to reduce crosstalk between ADSL
signals and POTS speech and
signalling.
Fig. 4: ATU-C AFE Schematics
7
(For detailed schematics request MTK-20140 reference design.)
MTC-20144
Interface to
MTC-20146