MSAN-141 Zarlink Semiconductor, Inc., MSAN-141 Datasheet - Page 20

• Manufacturer Part Number: MSAN-141
• Description: Implementation Details of the MT8930B-31B S-T Interface
• Manufacturer: Zarlink Semiconductor, Inc.

MSAN-141
the analog PLL is its capability to reject input jitter.
The PLL has a second order jitter transfer function
with a 3 dB cutoff point situated at 1kHz as shown in
Figure 22.
In the NT mode, the SNIC will produce a 192 kHz
baud rate clock by dividing the 4096 kHz system
clock. In the TE mode, the 192 kbit/s line data will
generate the 4096 kHz system clock as well as the
system frame pulse.
6.0 TRANSFORMER SPECIFICATION
The SNIC interfaces to the line port through 2:1
transformers whose typical schematic is shown in
Figure 23. To meet all the CCITT I.430 and ANSI
T1.605 Specifications on the S interface, the
A-220
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
(dB)
Jitter out
Jitter in
DC Resistance
DCR Match Between Split Windings
Turns Ratio Primary:Secondary
Inductance
Leakage Inductance
Distributed Capacitance Primary (C
Interwinding Capacitance
Dielectric Strength
Primary to Secondary
Volt-Microsecond Prod.
Longitudinal Conversion Loss
0
Figure 22 - Jitter Transfer Function
Transformer Parameter
Primary
Secondary
Primary (L
Secondary (L
Primary (L
Secondary (L
Secondary (C
1
Table 6. MT8930B/31B Transformer Specification
P
LP
P
)
)
)
S
LS
S
1
Frequency (kHz)
)
)
)
20
(dB/dec)
1500
Min.
100
22
88
30
43
5
1000
Typ.
2.0
3.0
1:2
30
Max.
specifications of the transformers used with the
SNIC must comply with the values listed in Table 6.
Figure 25 shows the test circuit used to measure the
longitudinal conversion loss parameter given in Table
6.
164
152
41
24
38
30
6
Figure 24 - Filtran TPW3852 connected to
Figure 23 - Typical Transformer Schematic
Units
SNIC
V- S
Ohm
Ohm
V
mH
mH
dB
dB
pF
pF
pF
%
(Protection Circuitry not shown)
rms
H
H
Secondary
V
LRx
LTx
Bias
10kHz @ 1V
Secondary Short Circuited,10kHz @ 1V
Primary Short Circuited,10kHz @ 1V
Secondary Open Circuit, 1 MHz @ 1V
Primary Open Circuit, 1 MHz @ 1V
1 MHz @ 1V
Termination 1, f=1.2 MHz. See Test Cct. Fig.3
Termination 2, f=1.2 MHz. See Test Cct. Fig.3
V
+
DD
MT8930B/31B
40
10 F
2 : 1
rms
rms
5
3
3
5
Test Conditions
4
4
Application Note
2 : 1
2 : 1
Primary
6
1
2
2
1
6
rms
rms
rms
rms