Alpha Bridge AB-25G-T/R 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 Descriptions
| 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 | |
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-T/R | 25G SFP28 BIDI 1270/1310nm 40km LC |
