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STLC1512 датащи(PDF) 4 Page - STMicroelectronics |
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STLC1512 датащи(HTML) 4 Page - STMicroelectronics |
4 / 26 page 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 |
Аналогичный номер детали - STLC1512 |
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Аналогичное описание - STLC1512 |
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