Overview
The ADM488ABRZ-REEL7 is a high-performance, full-duplex RS-485/RS-422 transceiver produced by Analog Devices Inc. This component is designed for balanced data transmission and complies with both EIA RS-485 and RS-422 standards. It operates from a single 5 V ± 10% power supply and is suitable for use in electrically harsh environments or where cables can be frequently plugged and unplugged. The transceiver features a differential line driver and a differential line receiver, making it ideal for full-duplex data transmission.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Power Supply Voltage (VCC) | - | - | 7 | V | - |
| Driver Input Voltage (DI) | -0.3 | - | VCC + 0.3 | V | - |
| Control Input Voltage (DE, RE) | -0.3 | - | VCC + 0.3 | V | - |
| Receiver Input Voltage (A, B) | -14 | - | +14 | V | - |
| Driver Output Voltage | -14 | - | +12.5 | V | - |
| Receiver Output Voltage | -0.5 | - | VCC + 0.5 | V | - |
| Power Supply Current (ICC) | 30 | - | 60 | µA | Outputs unloaded, receivers enabled |
| Driver Propagation Delay (tPLH, tPHL) | 250 | - | 2000 | ns | RL differential = 54 Ω, CL1 = CL2 = 100 pF |
| Driver Rise/Fall Time (tDR, tDF) | 250 | - | 2000 | ns | RL differential = 54 Ω, CL1 = CL2 = 100 pF |
| Maximum Data Rate | - | - | 250 | kbps | - |
| Input Impedance | - | - | 12 kΩ | - | - |
Key Features
- Compliance with EIA RS-485 and RS-422 standards
- Single 5 V ± 10% power supply operation
- Differential line driver and receiver for full-duplex data transmission
- High input impedance (12 kΩ) allowing up to 32 transceivers on the differential bus
- Thermal shutdown circuit to prevent excessive power dissipation
- Fail-safe feature resulting in a logic high output state if inputs are unconnected (floating)
- Internal protection circuitry against radiated and conducted interference
- Low electromagnetic emissions due to slew rate limited drivers
- Short-circuit protection and high EM immunity
Applications
- Low power RS-485 and RS-422 systems
- DTE-DCE interface
- Packet switching
- Local area networks
- Data concentration
- Data multiplexers
- Integrated services digital network (ISDN)
Q & A
- What are the primary standards that the ADM488ABRZ-REEL7 complies with?
The ADM488ABRZ-REEL7 complies with both EIA RS-485 and RS-422 standards.
- What is the operating voltage range of the ADM488ABRZ-REEL7?
The ADM488ABRZ-REEL7 operates from a single 5 V ± 10% power supply.
- What is the maximum data rate supported by the ADM488ABRZ-REEL7?
The maximum data rate supported is up to 250 kbps.
- What is the input impedance of the ADM488ABRZ-REEL7?
The input impedance is 12 kΩ, allowing up to 32 transceivers on the differential bus.
- Does the ADM488ABRZ-REEL7 have built-in protection features?
Yes, it includes thermal shutdown circuitry, fail-safe feature, and internal protection against radiated and conducted interference.
- What kind of environments is the ADM488ABRZ-REEL7 suited for?
It is suited for electrically harsh environments and where cables can be frequently plugged and unplugged.
- How does the slew rate limited driver benefit the operation of the ADM488ABRZ-REEL7?
The slew rate limited driver minimizes electromagnetic emissions, reducing both conducted and radiated interference.
- What is the typical application scenario for the ADM488ABRZ-REEL7?
A typical application is in full-duplex links where data is transferred at rates of up to 250 kbps, such as in local area networks and data multiplexers.
- Does the ADM488ABRZ-REEL7 require external protection components?
No, it does not require external protection components due to its internal protection circuitry.
- What is the significance of the thermal shutdown circuit in the ADM488ABRZ-REEL7?
The thermal shutdown circuit prevents excessive power dissipation by forcing the driver output into a high impedance state during fault conditions.
