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PHY1040
125Mbps to 1.25Gbps VCSEL/Laser Driver and Postamplifier
125Mbps – 1.25Gbps VCSEL/Laser Driver and Postamplifier
Features • Common anode VCSEL driver output stage
with 32mA max modulation drive and 20mA
bias current. • Continuous mode LASER driver with up to
80mA modulation and 90mA bias current • Closed or open loop bias mode with
temperature lookup table • Temperature compensated modulation current • Limiting amplifier with programmable low pass
filter and output swing • Device settings stored in external 2k EEPROM
Applications • Fast Ethernet • Gigabit Ethernet • OC-3
Description The PHY1040-01 is a continuous mode
VCSEL/Laser driver and limiting amplifier for use
within fiber optic modules for SFP and SFF
applications. Used with the PHY1092-01 or
PHY1095-01 transimpedance amplifiers and a low
cost serial EEPROM or microcontroller it forms a
complete SFP module solution.
The transmit section integrates a modulator output
stage optimised as a LASER or VCSEL driver in
common anode configurations.
The bias current can be controlled either by a fast
settling APC loop or in open loop mode which
uses a temperature lookup table.
The receiver includes a limiting amplifier with
programmable bandwidth. A Signal Detect/Loss Of
Signal function is implemented using the input
signal modulation amplitude with user selectable
threshold and hysteresis.
Operating with a 3.3V supply and rated from -40 to
+95°C ambient, the PHY1040-01 is housed in a
32pin, 5x5mm, RoHS compliant, QFN package.
PHY1040-01
A Maxim Integrated Products Brand 19-5677; Rev 1/11
Contents 1. Ordering Information ................................................................................................................... 3
2. Pin description ............................................................................................................................. 3
3. Key Specifications ....................................................................................................................... 5
3.1. Absolute Maximum Ratings ................................................................................................. 5
3.2. Continuous Ratings ............................................................................................................. 5
3.3. Transmitter .......................................................................................................................... 5
3.4. Receiver .............................................................................................................................. 8
3.5. 2-Wire Serial Interface ....................................................................................................... 12
4. Functional Description ............................................................................................................... 14
4.1. Overview ........................................................................................................................... 14
4.2. Transmitter features .......................................................................................................... 14
4.3. Receiver Features ............................................................................................................. 21
4.4. Laser/VCSEL Safety Features .......................................................................................... 23
4.5. Temperature Measurement ............................................................................................... 26
5. Control Interface ........................................................................................................................ 27
5.1. Boot Sequence .................................................................................................................. 28
5.2. Main Control Loop ............................................................................................................. 30
5.3. 2-wire Serial Interface ....................................................................................................... 31
6. Register Map ............................................................................................................................. 33
7. Simplified Interface Models ....................................................................................................... 45
8. Applications Information ............................................................................................................ 47
8.1. Power Supply Connections ............................................................................................... 47
8.2. VCSEL/Laser Connection – DC-Coupled .......................................................................... 48
8.3. VCSEL/Laser Connection – AC-Coupled .......................................................................... 49
8.4. TX_Fault Circuit – Standalone Mode ................................................................................ 50
9. Packaging ................................................................................................................................. 52
10. Contact Information ................................................................................................................... 53
1. Ordering Information
Part Number Description Package
PHY1040-01QS-RE VCSEL/LASER driver and Post Amp QFN32, 5mmx5mm in Tape and Reel
2. Pin description
Pin No Name Direction Type Description EEPROM_SDA I/O LVTTL EEPROM 2 wire serial interface data, internal 8kΩ pull up VDD_RXO Power Receiver output power supply VSS_RXO Ground Receiver output ground connection RXOUTM O/P CML Limiting amplifier serial data output RXOUTP O/P CML Limiting amplifier serial data output SDA I/O LVTTL 2-wire serial interface data SCL I/O LVTTL 2-wire serial interface clock IC Internally connected, this pin must be left open circuit TX_FAULT O/P
LVTTL
(Open
Collector)
Laser fail alarm (requires external pull up)
10 TX_DISABLE I/P LVTTL Laser enable / disable
11 TXINP I/P High Speed
Input Laser driver serial input, see section 7.0 for interfacing details
12 TXINM I/P High Speed
Input Laser driver serial input, see section 7.0 for interfacing details
13 VSS_IC Internal connection, connect to ground
14 NC No connection
15 NC No connection
16 MPD I/P Analog Monitor photodiode input
17 LVBIAS O/P Analog Laser bias current output
18 LVMODE Analog Select VCSEL or Laser mode
19 VDD_TXO Power Driver output power supply
20 VSS_TXO Ground Driver output ground connection
21 LVOUTM O/P High speed
Output Laser/VCSEL driver serial output
22 LVOUTP O/P High speed
Output Laser/VCSEL driver serial output
23 VSS_TXO Ground Driver output ground connection
24 VDD_TXO Power Driver output power supply
25 IC Internally connected, this pin must be left open circuit
26 SD/LOS O/P
LVTTL
(Open
Collector)
Signal Detect or Loss of signal output (requires external pull up). Polarity
selected by user
Pin No Name Direction Type Description
28 RXINM I/P CML Limiting amplifier serial data input
29 RXINP I/P CML Limiting amplifier serial data input
30 VSS_RX Ground Receiver ground connection
31 VDD_RX Power Receiver power supply
32 EEPROM_SCL O/P LVTTL EEPROM 2-wire serial interface clock, internal 8kΩ pull up
EP VSS_EP Ground Common ground / thermal pad
3. Key Specifications
3.1. Absolute Maximum Ratings
Parameter Conditions Min Typ Max Unit
Supply voltage -0.5V 6.5 V
Voltage on any signal pin -0.5
VDD
+
0.5V
Storage temperature 150 °C
Max junction temperature 140 °C
Max soldering temperature IPC/JEDEC J-STD-020C 260 °C
ESD Human Body Model JESD-22-A114-B 2 kV
Device not guaranteed to meet specifications, permanent damage may be incurred by operating beyond these limits.
3.2. Continuous Ratings
Parameter Conditions Min Typ Max Unit
Operating supply voltage Continuous operation 2.97 3.3 3.63 V
Current consumption Excluding bias & modulation current
at 20mA bias & 20mA modulation 120 145 mA
Operating temperature Ambient still air -40 25 +95 °C
3.3. Transmitter
3.3.1. Transmitter Inputs: TXINP/M
Parameter Conditions Min Typ Max Unit
Input Voltage
VILmin 1.14 V
VIHmax VDD_TX V
Input Swing Vpp(diff) 0.2www.jojwww Vpp
