Alpha Bridge AB-25G-40 Datasheet

Features

  • Operating data rate up to78 Gbps
  • Up to 40km transmission distance
  • High sensitivity APD photodiode and TIA
  • Rate Adaptation
  • LC single connector
  • Hot pluggable 20pin connector
  • Low power consumption <1.5 W
  • Single +3.3V±5% power supply
  • Compliant with SFF-8472
  • Fully RoHS Compliant
  • Operating case temperature: Commercial: 0°C ~ 70°C Industrial: -40°C ~ 85°C

Applications

  • 25GE BASE-ER Ethernet
  • CPRI Option 10/eCPRI

Standards

  • SFF-8472
  • SFF-8431, SFF-8432

Absolute Maximum Ratings

Parameter Symbol Min Typical Max Unit Notes
Storage Temperature TS -40   +85 V  
Operating Relative Humidity RH 0   +85 °C No condensation

General Specifications

Parameter Symbol Min Typical Max Unit Notes
Operating Case Temperature Tc -40 - 85 °C  
Power Supply Voltage Vcc 3.15 3.3 3.45 V  
Maximum Power Dissipation PD - - 1.5 W  
Lane Baud Rate BRLANE - 25.78 - Gbps  
Max Supported Link Length L - - 40 Km  

Pin Definitions

Pin Number Symbol Name Description
1,17,20 VeeT Transmitter Signal Ground Connected to signal ground on the host board.
2 TX Fault Transmitter Fault Out (OC) Module transmitter fault output.
3 TX Disable Transmitter          Disable (LVTTL) In
4 SDA     Module Definition Identifiers Serial ID with SFF 8472 Diagnostics Module Definition pins should be pulled up to Host Vcc with 10 kΩ resistors.
5 SCL
6 MOD-ABS
7 RS0 Receiver           Rate (LVTTL)         Transmitter Select (LVTTL) Select Rate
  9   RS1
8 LOS Loss of Signal Out (OC) Receiver loss of signal.
10,11,14 VeeR Receiver Signal Ground Connected to signal ground on the host board.
12 RD- Receiver Negative DATA Out (CML) Receiver inverted data coupled and terminated
13 RD+ Receiver Positive DATA Out (CML) Receiver non-inverted data output, internally AC coupled and terminated.
15 VccR Receiver Power Supply Receiver Power 3.3V Supply.
16 VccT Transmitter Power Supply Transmitter Power 3.3V Supply.
18 TD+ Transmitter Positive DATA In (CML) Transmitter non-inverted data input, internally AC coupled and terminated.
19 TD- Transmitter Negative DATA In (CML) Transmitter inverted data Input, internally AC coupled and terminated.

Digital Diagnostic Functions

Parameter Symbol Min Typical Max Units Notes
Bit Rate (per lane) BR - 25.78 - Gb/s  
Electrical Bit Error Rate (per lane) BER - - 5E-5 -  

Electrical Characteristics

Parameter Symbol Conditions Min. Typ. Max. Unit
Transmitter
Input Differential Impedance RIN   - 100 - Ω
Single-ended Data Input Swing VIN   90 - 450 mVp-p
Transmit Disable Voltage VDIS   2 - VCCHOST V
Transmit Enable Voltage VEN   VEE - VEE+0.8 V
Transmit Fault Assert Voltage VFA   2 - VCCHOST V
Transmit Fault De-Assert Voltage VFDA   VEE - VEE+0.4 V
Receiver
Single-ended Data Output Swing VOD   200 - 450 mVp-p
LOS Fault VLOSFT   2 - VCCHOST V
LOS Normal VLOSNR   VEE - VEE+0.4 V

Optical Characteristics

Parameter Symbol Conditions Min. Typ. Max. Unit
Transmitter
Center Wavelength λ   1260 1270 1280 nm
Center Wavelength λ   1300 1310 1320 nm
Average Output Power Pav   0 - 6 dBm
Spectral Width (-20dB) σ   - - 1 nm
Extinction Ratio ER   3.5 - - dB
Side Mode Suppression Ratio SMSR   30 - - dB
Average Launch Power of OFF Transmitter POFF   - - -30 dBm
Relative Intensity Noise RIN   - - -128 dB/Hz
Receiver
Center Wavelength λC   1300 1310 1320 nm
Center Wavelength λC   1260 1270 1280 nm
Receiver Sensitivity SEN Note1 - - -19 dBm
Receiver Overload Pmax   -5 - - dBm
Receiver Reflectance     - - -12 dB
LOS Assert LOSA   -35 -   dBm
LOS De-Assert LOS LOSD   - - -21 dBm
LOS Hysteresis     0.5 -   dB

DIGITAL DIAGNOSTIC SPECIFICATION

Parameter Symbol Accuracy Units Notes
Transceiver Case Temperature DMI_TEMP ±5 ̊C  
Supply voltage monitor absolute error DMI _VCC ±3 %  
Channel Bias current monitor DMI_IBIAS ±10 %  
Channel RX power monitor absolute error DMI_RX ±3 dB  
Channel TX power monitor absolute error DMI_TX ±3 dB  

Ordering Information

Part Number Product Description
AB-25G-40 25G SFP28 1310nm 40km Dual LC
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