Overview
The ADM3485EARZ is a 3.3 V, low-power, half-duplex transceiver designed for balanced data transmission on multipoint bus transmission lines. It complies with TIA/EIA standards RS-485 and RS-422. This device is manufactured by Analog Devices and is suitable for applications requiring high-speed data transmission with robust protection features.
Key Specifications
| Parameter | Min | Typ | Max | Unit | Test Conditions/Comments |
|---|---|---|---|---|---|
| Maximum Data Rate | 12 | - | - | Mbps | - |
| Differential Output Delay (tDD) | 1 | 22 | 35 | ns | RL = 60 Ω, CL1 = CL2 = 15 pF |
| Differential Output Transition Time (tTD) | 3 | 11 | 25 | ns | RL = 60 Ω, CL1 = CL2 = 15 pF |
| Propagation Delay From Low to High Level (tPLH) | 7 | 23 | 35 | ns | - |
| Receiver Input Impedance | 12 | - | - | kΩ | - |
| ESD Protection on RS-485 Input/Output Pins | ±15 | - | - | kV | Human body model |
| Shutdown Current (ISHDN) | 0.002 | - | 1 | µA | DE = 0 V, RE = VCC, DI = 0 V or VCC |
| Package Type | - | - | - | 8-lead narrow SOIC | - |
Key Features
- TIA/EIA RS-485/RS-422 compliant
- ±15 kV ESD protection on RS-485 input/output pins
- 12 Mbps data rate
- Half-duplex transceiver
- Up to 32 nodes on the bus due to 12 kΩ receiver input impedance
- Receiver open-circuit, fail-safe design
- Low power shutdown current
- Outputs high-Z when disabled or powered off
- Common-mode input range: −7 V to +12 V
- Thermal shutdown and short-circuit protection
- Industry-standard 75176 pinout
Applications
- Power/energy metering
- Telecommunications
- EMI-sensitive systems
- Industrial control
- Local area networks
Q & A
- What is the maximum data rate of the ADM3485EARZ?
The maximum data rate of the ADM3485EARZ is 12 Mbps.
- What type of ESD protection does the ADM3485EARZ offer?
The ADM3485EARZ offers ±15 kV ESD protection on RS-485 input/output pins.
- What is the package type of the ADM3485EARZ?
The ADM3485EARZ comes in an 8-lead narrow SOIC package.
- How many nodes can be connected on the bus with the ADM3485EARZ?
Up to 32 nodes can be connected on the bus due to the 12 kΩ receiver input impedance.
- What is the common-mode input range of the ADM3485EARZ?
The common-mode input range of the ADM3485EARZ is −7 V to +12 V.
- Does the ADM3485EARZ have thermal shutdown protection?
Yes, the ADM3485EARZ has thermal shutdown and short-circuit protection.
- What is the shutdown current of the ADM3485EARZ?
The shutdown current (ISHDN) of the ADM3485EARZ is 0.002 to 1 µA.
- Is the ADM3485EARZ compliant with TIA/EIA standards?
Yes, the ADM3485EARZ is compliant with TIA/EIA standards RS-485 and RS-422.
- What are some typical applications of the ADM3485EARZ?
Typical applications include power/energy metering, telecommunications, EMI-sensitive systems, industrial control, and local area networks.
- Does the ADM3485EARZ have a fail-safe feature for the receiver?
Yes, the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating).
