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| s FEATURES * Allows for separate powering of receiver and transmitter section * Power supply lines filtered externally to module under test * Signal Detect level displayed by LED * Power supply can be interrupted separately for receiver and transmitter * External Data and Signal Detect interfaces are made through high performance SMA connectors * Receiver data outputs are DC coupled. Output voltage can be directly measured at SMA connectors V23806-S84-Z1 3.3 V V23806-S84-Z2 5V Testboard ATM, Fibre Channel and Gigabit Ethernet Transceivers Preliminary Features of 2x9 pin row version * Fail function of transmitter (Tx +2dB Alarm) displayed by LED (TxAlm) * Switch for Reset after fail function of transmitter (TxResn) * Test pin for laser bias current monitor output (Bias Monitor) * Test pin for optical power monitor output (Power Monitor) DESCRIPTION This testboard is a functional test fixture intended for use with the 1x9 pin row and the 2x9 pin row single mode 155MBd or 622MBd ATM transceiver and the Fibre Channel and Gigabit Ethernet transceivers. It provides a test medium for characterizing the performance of these transceivers. Schematic of Testboard Legend SD RxCn RxC RxD RxDn TxDn RxVCC 1 TxD SMA-connector (female) Power supply connector (female) VEE (black) VEE LD (Puls) Pw rM on BiasM on LD TxAlm VCC (red) LED (red) Switches DU T SM Fiber 3-Pin jumper, to measure and to interrupt receiver/ transmitter power supply Test pin row LckDet TxAlm SD TxResn Local Loop 1 TxVCC Semiconductor Group APRIL 1998 Connectors/Test Pins Label Type Name Level Description SD RxC*) RxCn*) RxD RxDn SMA SMA SMA SMA SMA Signal Detect Output Receiver Clock Output Receiver Clock Not Output Receiver Data Output Receiver Data Not Output PECL Output PECL Output PECL Output PECL Output PECL Output To measure use high input resistance voltmeter or scope Load is 50 to GND, DC coupled or AC coupled, depending on board assembly TxD TxDn VCC VEE PwrMon**) SMA SMA Transmitter Data Input Transmitter Data Not Input Power Supply Ground PECL Input PECL Input Load is 50 to GND, AC coupled In accordance with recommended operating conditions of transceiver (3.3V / 5V) Test Pin Row Power Monitor Output Pin and GND Pin Analog Voltage Output Output voltage is proportional to optical laser power. - Output voltage VO=2V0.1V if no laser fault - Source resistance RS = 110 k (100 k RS of transceiver, 10 k on testboard) Bias Mon**) Test Pin Row Bias Monitor Output Pin and GND Pin Analog Voltage Output Output voltage is proportional to laser bias current. - Output voltage VO=VCC - Ibias x 45 - Source resistance RS = 10 k on testboard TxAlm**) Test Pin Row Tx + 2dB Alarm output pin and GND pin TTL Output active high High level: fail function of transmitter Low level: no fail function Indicators/Switches Label Type Name Level Description SD TxAlm LckDet*) Tx Resn LED LED LED Switch Signal Detect Indicator Tx + 2dB Alarm Indicator Lock Detect Indicator Transmitter Reset / Disable Not Switch Local Loop Switch active high active high active high LED off: SD off LED on: SD on LED on: fail function of transmitter LED off: no fail function LED on: lock on LED off: lock off Resets the shutdown circuits of the transmitter and switches the laser off Multiplexes receiver output data to transmitter input data Local Loop*) Switch *) for future transceiver versions valid for 2x9 single mode 155 MBd module (V23806-A84-C1) **) Semiconductor Group V23806-S84-Z1/Z2, Testboard ATM, Fibre Channel, Gigabit Ethernet TRX 2 SCHEMATIC OF TESTBOARD for 5V only Semiconductor Group V23806-S84-Z1/Z2, Testboard ATM, Fibre Channel, Gigabit Ethernet TRX 3 FUNCTIONAL DESCRIPTION 1. Power supply Power supply filtering as recommended for good EMI performance. 2. Receiver clock and data outputs For DC coupling (5V) Load is 50 to GND also for not used outputs. C1, C2, C3, C4 = 75 R1, R2, R5, R6 = 82 R3, R4, R7 R8 not assembled , The output voltage is divided by a factor of 2.5. For VCC = 3.3V: C1, C2, C3, C4 = 32 R1, R2, R5, R6 = 130 For AC coupling (5V) Load is 50 to GND. C1, C2, C3, C4 = 100nF R1, R2, R5, R6 not assembled R3, R4, R7 R8 = 300 , The output voltage factor is close to 1. , For VCC = 3.3V: R3, R4, R7 R8 = 150 3. Signal detect output and LED The signal detect level is evaluated by comparator N1 and displayed by LED D1. For VCC = 3.3V: R13, R16 = 127 R14, R17 = 83 4. Transmitter data inputs The inputs are AC coupled. Load is 50 to GND. For VCC = 3.3V: R9, R10 = 82 R11, R12 = 130 5. Test pins The test pins Power Monitor and Bias Monitor are connected with device under test (transceiver) via 10k resistors. The switches S1 and S2 connect the local loop pin and TxResn pin of transceiver with VEE. Siemens Microelectronics, Inc. * Optoelectronics Division * 19000 Homestead Road * Cupertino, CA 95014 USA Siemens Semiconductor Group * Fiber Optics * Wernerwerkdamm 16 * Berlin D-13623, Germany Siemens K.K. * Fiber Optics * Takanawa Park Tower * 20-14, Higashi-Gotanda, 3-chome, Shinagawa-ku * Tokyo 141, Japan www.smi.siemens.com/opto.html (USA) * www.siemens.de/Semiconductor/products/37/376.htm (Germany) |
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