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TLK1002ARGERG4 Datasheet(PDF) 2 Page - Texas Instruments |
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TLK1002ARGERG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 16 page www.ti.com BLOCK DIAGRAM + − input buffer stage VML output buffer Q Q input buffer stage + - VML output buffer Q Q MUX I1 I2 Q SEL reference voltage and bias current generation VDD GND VDD GND RXB+ RXB− TXA+ TXA− RXA+ RXA− TXB+ TXB− RCLK low−noise half−rate clock synthesizer PLL ICLK RCLK QCLK signal conditioning PLL ICLK DOUT DIN QCLK signal conditioning PLL ICLK DIN DOUT QCLK 2 2 2 amplifier stage 2 MUX I1 I2 Q SEL 2 LBB ENB ENA LBA 2 2 2 2 DATA PATHS TLK1002A DUAL SIGNAL CONDITIONING TRANSCEIVER SLLS661 – JUNE 2005 A simplified block diagram of the TLK1002A circuit is shown in Figure 1. The main circuit parts are described in detail below. Figure 1. Simplified Block Diagram of the TLK1002A Transceiver The serial input data streams are connected to the input ports RXA+/RXA– or RXB+/RXB– respectively. The input stages provide on-chip differential 100- Ω termination. The outputs of the input buffer stages are connected to the signal conditioning PLL circuits. The PLL output signals are fed to multiplexer (MUX) stages, which are used to redirect the data signals if loop back mode is selected. The multiplexer stages are connected to the output ports TXB+/TXB– or TXA+/TXA– , respectively, by means of VML output buffer stages. To enable the output buffer stages, ENA and ENB, which are internally pulled up, must be at high level (VDD). The loop back modes are enabled by means of the control-inputs LBA and LBB, which are implemented as active low inputs with integrated pull-up resistors. If LBA is set to low level, the input data applied to the input port RXA+/RXA– is retimed and fed to both output ports TXB+/TXB– and TXA+/TXA–. If LBB is pulled low, the retimed input data signal applied to RXB+/RXB– is available at TXA+/TXA– and TXB+/TXB–. If a logic low signal is applied to both loop back control inputs the retimed signal connected to RXA+/RXA– appears at TXA+/TXA–, while the retimed signal applied to RXB+/RXB– is fed to TXB+/TXB–. 2 |
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