PM4341AT1XC
DATA SHEET
PMC-900602
ISSUE 7
T1 FRAMER/TRANSCEIVER
Figure 6
- External Analog Receive Interface Circuit
V
DD
RAVD
R1
1:N
T
RAS
R2
R
REF
RRC
0.1 µF
± 10%
RAVS
47 nF
±10%
316 k ±1%
Ω
Notes:
1. All capacitors ceramic
2. Some transformer manufacturers produce a dual part containing both the 1:2 & 1:1.36
transformers required for the receive and transmit interfaces, respectively.
The transformer used should be designed for use in T1 applications. Many
manufacturers have standard products for these applications. Typical
characteristics of a suitable transformer are given in the following table.
Table 2
-Typical Characteristics of ReceiveTransformer
Turns
Ratio
OCL (mH
min.)
Cw/w (pF
max.)
LL (µH
max.)
DCR pri.
(Ω max.)
DCR sec.
(Ω max.)
(PRI:SEC)
1:2
1.20
35
0.80
0.80
1.2
where OCL is the open-circuit inductance,
Cw/w is the inter-winding capacitance,
LL is the leakage inductance, and
DCR is the DC resistance.
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
38
PMC [ PMC-SIERRA, INC ]
