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STLC1512 датащи(PDF) 4 Page - STMicroelectronics

номер детали STLC1512
подробное описание детали  NorthenLite??G.lite BiCMOS Analog Front-End Circuit
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STLC1512 датащи(HTML) 4 Page - STMicroelectronics

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STLC1512
4/26
32
TXVCC2
VCC
+5.0V supply for power amp output stage
33
TXVCC3
VCC
+5.0V supply for Tx path circuitry and bias blocks
34
AMPOUT
AO
Undedicated opamp output
35
AMPIN
AI
Undedicated opamp negative input
36
AMPIP
AI
Undedicated opamp positive input
37
DCFBON
AO
Power amp DC feedback amplifier negative output
38
DCFBOP
AO
Power amp DC feedback amplifier positive output
39
TXANG
AO
2.5V Tx buffered reference
40
FPP
AO
Fast path positive output
41
FPN
AO
Fast path negative output
42
PAIP
AI
Tx Power amplifier positive input
43
PAIN
AI
Tx Power amplifier negative input
44
RBIAS
AO
Reference resistor generating bias current
45
REF2P5
AI
Externally supplied 2.5V reference
46
NC
Not connected
47
LPFOUT
AO
LPF (low pass filter) Op Amp output
48
LPFIN
AI
LPF (low pass filter) Op Amp negative input
<1>The values of the components that are connected to the pins are shown in Figure 11.
<2>If the undedicated opamp is used in the transmit path, AMPPD can be connected to TXPD on the board. If the undedicated opamp
is used in the receive path, AMPPD can be connected to RXPD on the board. This opamp is powered off of TXVCC3.
Table 1. Pin Description
3.0 FUNCTIONAL DESCRIPTION
The STLC1512 consists of the following functional
blocks:
s
Transmit Signal Path
s
Receive Signal Path
s
Thermal Protection
The transmit signal that comes from the AFE is fil-
tered before it reaches the line driver. STLC1512
contains an opamp that can be utilized as part of this
filter. The AMPPD pin allows this op amp to be pow-
ered down independently. The line driver consists of
a preamp followed by a current drive power stage.
The preamplifier provides large open loop gain while
the power stage provides open collector current drive
to allow for single supply switching. The center tap of
the primary side of the transformer is connected to a
supply that can be switched between 5.0V and a low-
er supply to realize power savings on a DMT signal.
The reference design sets this supply at 3.3V. The
line driver can be powered down by a low at the
TXPD pin.
The receive path consists of a Programmable Gain
Amplifier (PGA) and an active low pass filter. The
PGA is programmable in four steps. The active low
pass filter is composed of an on chip op amp and ex-
ternal passive components. The receive signal pass-
es through the PGA, is low pass filtered and then
driven off chip to the AFE chip. Both the PGA and the
opamp can be powered down by RXPD signal.
A thermal protection circuit has also been implement-
ed on the chip to prevent the chip from overheating
under fault conditions.
4.0 SPECIFICATIONS
4.1 Chip Specifications
The cross-talk specifications are based on the as-
sumption that cross-talk should not degrade the
SNDR of the receive signal. If there is receive cross-
talk into the transmit path, this signal will come back
through the hybrid balance and cause noise in the re-
ceive path. If the signal is undistorted it will cause a
small gain and phase error which will not affect per-
formance. If it is distorted it will cause an increased


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