STLC60134S View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STLC60134S' PDF : 22 Pages View PDF
STLC60134S
Table 12. AGC of TX Path (from filter output to TXP and TXN).
Output noise
25mVHz-1/2
Input level (nominal)
1Vpd
Output level nominal, full-scale
1.5Vpd
Maximum Output Load
> 500Ω; <10pF
AGC range:
-15dB...dB
AGC step:
1dB
Gain and step accuracy
±0.3dB
Minimum code (0000) stands for AGC = -15dB and maximum (1111 - MSB left) for AGC = 0dB (See Tx
setting, Table22).
TX Pre-driver Capability
The pre-driver drives an external line power amplifier which transmits the required power to the line.
Table 13. TX Pre-driver
TX drive level to the external line driver for max. AGC setting
External line driver input impedance:
Pre-driver characteristics:
closed loop gain:
ooutput impedance:
output offset voltage (0dB)
input noise voltage (0dB)
output common mode voltage:
resistive
capacitive
-15dB...0dB with step = 1dB
< 10mV
< 20nVHz-1/2 @ f > 250kΩ
< 50nVHz-1/2 @ 34.5K < f
<138kΩ
1.6V < Vcm < 1.7V
1.5 Vpdif
> 500Ω
< 30pF
TX Filter
The TX filters act not only to suppress the DMT sidebands but also as smoothing filters on the D/A con-
vertor’s output to suppress the image spectrum. For this reason they must be realized in a continuous
time approach.
ATU-R TX Filter
The purpose of this filter is to remove out-of-band noise of the ATU-R TX path echoed to the ATU-R RX
path. In order to meet the transmitter spectral response, an additional filtering must be (digitally) per-
formed. The integrated filter has the following characteristics:
Table 14. Integrated SC Filter Characteristics
Description
Input referred noise
Max. input level
Max. output level
Type
Frequency band
Frequency tuning
Max. in-band ripple
Matlab Model
Default cut-off frequency @ -3dB
Actual cut-off @ -3dB
SC Freq. selection register
100nVHz-1/2
Value/Unit
1Vpd
1Vpd
4th order chebytchef
138kHz (0% setting see below)
-25% -> +25%
1dB
[B,A] = cheby1 (4,0.5,W0,’s’) {ripple = 0.5}
F0 = 151.8kHz
W0 = 2*pi*F0/((17+n)/16)
n = -4,..,3
see (AFE settings, Table 22)
10/22
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