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CPC5604ATR 数据表(PDF) 16 Page - Clare, Inc. |
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CPC5604ATR 数据表(HTML) 16 Page - Clare, Inc. |
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16 / 33 page  www.clare.com 16 CPC5604 XXX Signals to and from the telephone line to the LiteLinkTM appear on Tip and Ring connections. The receive signal is extracted from the transmit signal via the 2-4 wire hybrid block. The receive signal is then converted to infrared light by the receive photodiode amplifier and LED front end. The intensity of the infrared light is modulated by the receive signal and this light is transferred across the electrical isolation barrier via reflective dome to a pho- todiode where the light is converted to a photocurrent. This photocurrent is a highly linear representation of the receive signal and is amplified and converted to a volt- age. This single ended voltage is converted to a differen- tial voltage signal where it is presented as RX+ and RX- and connects to the receive inputs of the host data pump. Variations in gain due to quantum efficiency of the optics are virtually eliminated by an on chip AGC circuit which automatically sets the input to output gain of the pho- toamplifier to unity. This means that the receive signal on the telephone line is faithfully reproduced at the RX out- puts in terms of amplitude to within 2dB of the received signal. Distortion at the RX outputs is -80dB maximum at a receive level of -3dB over the band of 30Hz-4kHz. Single supply operation requires that the RX outputs be biased at 2.5V DC, therefore, it is necessary to use 0.1uf blocking capacitors for coupling the receive signal to the host. Figures 2.4.A and 2.4.B. illustrate connection to the host differentially and single ended respectively. Receive Signal Path (Refer to Block Diagram) Figure 2A Connection To Host Differential (Receive) Figure 2B Connection To Host Single Ended (Receive) RX+ RX- RX+ RX- 0.1uF CPC5604A LITELINK TM HOST DATA PUMP/CODEC SINGLE ENDED CONNECTION TO CPC5604A RX+ RX- RX+ RX- 0.1uF 0.1uF CPC5604A LITELINK TM HOST DATA PUMP/CODEC DIFFERENTIAL CONNECTION TO CPC5604A Transmit Signal Path (Refer to Block Diagram) Signals that are to be sent from the host to the tele- phone line are placed differentially on TX+ and TX-. The maximum value of the transmit signal should not exceed 0dBm or 2.18Vpp. The differential transmit sig- nal is converted to a single ended signal by the LiteLinkTM. This signal is coupled to the transmit photo- diode amplifier in a similar manner to the receive path. At the output of this amplifier the voltage signal is cou- pled to a voltage to current converter via a transcon- ductance stage where the transmit signal modulates the telephone line loop current. As in the receive stage, the gain of the transmit photodiode amplifier is set to unity automatically thereby limiting insertion loss to 0±1dB. Figures 2C and 2D illustrate connection to the host dif- ferentially and single ended respectively. TXA1 TXA2 - + 0.1uf 0.1uf HOST DATA PUMP/CODEC SINGLE ENDED CONNECTION TO CPC5604A CPC5604A LITELINK TM TX- TX+ Figure 2C Connection To Host Differential (Transmit) |
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