ADM3251EARWZ is a transceiver device having the characteristics of high speed, 2.5kv full isolation, and a single channel. It complies with the EIA/TIA-232E and ITU-T V.28 specifications and operates at data rates up to 460 kbps. The following information collected by Easybom includes the features, applications, CAD Model, theory of operation, and more.
ADM3251EARWZ operates from a single 5V power supply and is suitable for operation in electrically harsh environments or a situation where RS-232 cables are frequently being plugged and unplugged. ADM3251EARWZ consists of dual-channel digital isolators with isoPower™ integrated, isolated power. A separate isolated dc-to-dc converter is not required. It contains ICEpower technology that uses high-frequency switching elements to transfer power through the transformer. The ADM3251EARWZ is available in a 20-lead, wide-body SOIC package and is specified over the -40℃ to +85℃ temperature range.
ADM3251EARWZ Features
- 5 kV fully isolated (power and data) RS-232 transceiver
- 460 kbps data rate
- Meets EIA/TIA-232E specifications
- ESD protection on RIN and TOUT pins
±8 kV: contact discharge
±15 kV: air gap discharge
- High common-mode transient immunity: >25 kV/μs
- Operating temperature range: −40°C to +85°C
- Widebody, 20-lead SOIC package
ADM3251EARWZ Application
- High noise data communications
- Industrial communications
- General-purpose RS232 data links
- Industrial/telecommunications diagnostic ports
- Medical equipment
ADM3251EARWZ Pinout
Pin Function Descriptions
ADM3251EARWZ Applications Information
No external circuitry is required by the ADM3251EARWZ for its logic interfaces. Power supply bypassing is required at the input and output supply pins. Bypass capacitors are connected between Pin3 and Pin4 and between Pin19 and Pin20 for VCC and for VISO respectively. The capacitor value should be between 0.01 μF and 0.1 μF. The total lead length between both ends of the capacitor and the input power supply pin should not exceed 20 mm.
Because the heat sink cannot be applied to isolation device, heat is dissipated into the PCB through the ground pins. The board layout shows enlarged pads for Pin4, Pin5, Pin6, Pin7, Pin10, and Pin11. In applications involving high common-mode transients, board coupling across the isolation barrier should be minimized. Moreover, the board layout should be designed such that any coupling that does occur equally affects all pins on a given component side. The power supply section uses a 300 MHz oscillator frequency to pass through its chip-scale transformers.
ADM3251EARWZ CAD Model
Symbol
Footprint
3D Model
ADM3251EARWZ Theory of Operation
The internal circuitry consists of the following main sections:
- Isolation of power and data
- A charge pump voltage converter
- A 5.0V logic to EIA/TIA-232E transmitter
- A EIA/TIA-232E to 5.0 V logic receiver
ADM3251EARWZ Manufacturer
Analog Devices is an international market leader in the design, production, and commercialization of a large range of high-performance integrated circuits (ICs) for analog, mixed-signal, and digital signals (DSP) processing of almost all electronic systems. Since we started in 1965, the focus has been on the engineering challenge in electronic equipment related to signal to process. Our signal processing solutions, utilized by over 100,000 customers worldwide, play a key role in the conversion, conditioning, and processing of real-world events such as temperature, pressure, sonority, illumination, speed, and movement to electric signals for a wide range of electronic devices.
