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BT8376EPF Scheda tecnica(PDF) 202 Page - Synaptics Incorporated.

Il numero della parte BT8376EPF
Spiegazioni elettronici  single chip transceivers for T1/E1 and Integrated Service Digital Network (ISDN) primary rate interfaces
PDF  323 Pages
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Produttore elettronici  CONEXANT [Synaptics Incorporated.]
Homepage  https://www.synaptics.com/
Logo CONEXANT - Synaptics Incorporated.

BT8376EPF Scheda tecnica(HTML) 202 Page - Synaptics Incorporated.

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Bt8370/8375/8376
3.14 Clock Rate Adapter Registers
Fully Integrated T1/E1 Framer and Line Interface
3-84
Conexant
N8370DSE
LFGAIN[3:0]
Loop Filter Gain—Determines CLAD jitter tolerance and jitter attenuation characteristics by
selecting the NCO loop filter's proportional phase error gain. Lower gain values improve jitter
tolerance by reducing phase response time, but provide less jitter attenuation. Higher gain
values increase the phase response time and improve jitter attenuation at the expense of loop
acquisition time.
NOTE:
Loop instability or acquisition failures may result from incorrectly programmed
LFGAIN values. Typically, LFGAIN is programmed to provide a minimum 3 Hz loop
bandwidth and 20 dB/decade jitter attenuation with 6 Hz filter cutoff frequency.
LFGAIN values of 5 or 6 are typically chosen to meet jitter requirements.
091—CLAD Frequency Select (CSEL)
VSEL[3:0]
CLADV Frequency Select—Applicable only if CEN [addr 90] is active. Picks one of eight
CLAD divider chain frequencies to feed back to the CPHASE detector. (Refer to Tables 2-8
through 2-9 for programming examples.) The selected CLADV frequency passes to VSCALE
for further division before phase detector comparison.
LFGAIN
Proportional Gain
0000
1/20
||
1111
1/215
7
6
5
4
3
2
1
0
VSEL[3]
VSEL[2]
VSEL[1]
VSEL[0]
OSEL[3]
OSEL[2]
OSEL[1]
OSEL[0]
VSEL
CLADV Frequency (kHz)
0000
1024
0001
2048
0010
4096
0011
8192
0100
2560
0101
1544
0110
1536
0111
T1/E1 line rate x 2XSEL (addr 090)
1xxx
16,384



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