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ACS104A Datasheet(PDF) 1 Page - Semtech Corporation |
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ACS104A Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 12 page 1 2 Advanced Communications ACS104A Data Sheet Description Equivalent Block Diagram of ACS104A ACS104A * Low cost, single-chip solution for data powered RS-232 modems using twin fiber-optic cables. Includes all analog/digital functions except for power extraction circuitry and RS-232 level shifting. * Suitable for plastic or glass fiber, RF, infra-red over free air or other media. * Uses low cost LED and PIN combination to transmit and receive data. * Additional operating mode to support PIN with integrated TIA. * Asynchronous data rates from DC to 162kbps. * Very low power consumption; typically 2 - 3mA, which could be extracted from the RS232 port itself, for > 12 dB link budget. * Supports 3 additional low frequency asynchronous channels or the RS-232 handshake signals. * Bit Error Rate (BER) < 10-9 * Available in 44 pin TQFP (part no: ACS104A-TQ) and 28 pin PLCC (part no: ACS104A-PL) packages. The ACS104A is a complete controller, driver and receiver IC, supporting full- duplex asynchronous transmission from DC to 162kbps over a serial link. Improved sensitivity and additional operating modes are offered over the ACS104. Although primarily designed to be used with standard LED emitters and PIN receivers and twin optical fibers, any other simple serial media may be used. The ACS104A is optimised for very low power consumption, consuming only 2 - 3mA at RS-232 data rates including power provided to the LED and 'heartbeat' monitor. In applications where the power is extracted from the RS232 data lines, this leaves a generous amount of power left for any power extraction and RS-232 level shifting circuitry. The ACS104A employs data compression and time compression techniques, affording high launch power in short bursts, leading to a low average power consumption. The advantage of this approach is that high link budgets can be achieved with inexpensive optical components. For example, the recommended set-up for RS-232 applications (19.2kbps + handshake signals) assumes that the LED is driven with a peak current of approximately 15.4mA for 6 % of the time. The machine cycle is short enough to facilitate power supply smoothing with a small external capacitor in the region of 100µF. LED Driver PIN Receiver Data Compress 3B4B Encoder Digital Filter Data Decompress 3B4B Decoder Digital Filter RS-232 Interface Control Logic DCDB CTS DSR RTS DTR DR(2:1) DM(2:1) LED/PIN combinations TRC TxD RxD FIFO Time Decompress FIFO Time Compress PORB RIO RII HBT Features ACS104A Fiber Modem |
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