ADM4857 - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

ADM4857
Manufacturer

ADI
ChipWorker Part#

CW622293976
Description

5V, ⅛ Load, Slew-Rate Limited, RS-485/RS-422 Transceiver (Full Duplex, 10Mbps)
Documentation

Datasheet

ADM4857 Global Supplier

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ADM4857 Specifications

Attribute	Attribute Value

Part Number	ADM4857
Manufacturer	ADI
ChipWorker Part#	CW622293976
Documentation	Datasheet
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Product Lifecycle Status	Active

Product Description

Product Details
The ADM4850 / ADM4851 / ADM4852 / ADM4853 / ADM4854 / ADM4855 / ADM4856 / ADM4857 are differential line transceivers suitable for high speed, half-duplex and full duplex data communication on multipoint bus transmission lines. They are designed for balanced data transmission and comply with EIA Standards RS-485 and RS-422. The ADM4850 / ADM4851 / ADM4852 / ADM4853 are half-duplex transceivers that share differential lines and have separate enable inputs for the driver and receiver. The full duplex ADM4854 / ADM4855 / ADM4856 / ADM4857 transceivers have dedicated differential line driver outputs and receiver inputs.
The devices have a 1/8-unit load receiver input impedance, which allows up to 256 transceivers on one bus. Because only one driver must be enabled at any time, the output of a disabled or powered down driver is three-stated to avoid overloading the bus.
The receiver inputs have a true fail-safe feature, which ensures a logic high output level when the inputs are open or shorted.
This guarantees that the receiver outputs are in a known state before communication begins and when communication ends. The driver outputs are slew rate limited to reduce EMI and data errors caused by reflections from improperly terminated buses. Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit.
The devices are fully specified over the commercial and industrial temperature ranges and are available in 8-lead SOIC (ADM4850 through ADM4857), 8-lead LFCSP (ADM4850 / ADM4852 / ADM4853), and 8-lead MSOP (ADM4850 only) packages.
Applications
Low power RS-485 applications
EMI sensitive systems
DTE to DCE interfaces
Industrial control
Packet switching
Local area networks
Level translators
### Features and Benefits
Electronics industries alliance (EIA) RS-485/RS-422 compliant
Data rate: 10 Mbps
Half-duplex and full duplex options
Reduced slew rates for low electromagnetic interference (EMI)
True fail-safe receiver inputs
5 µA (maximum) supply current in shutdown mode
Up to 256 transceivers on one bus
Outputs high-Z when disabled or powered off
−7 V to +12 V bus common-mode range
Thermal shutdown and short-circuit protection
Pin-compatible with the MAX308x
Specified over the −40°C to +85°C temperature range
Available in 8-lead SOIC, 8-lead LFCSP, and 8-lead MSOP
Qualified for automotive applications

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- Carefully tested and packaged by ChipWorker
- Vacuum packed
- Anti-static packaging
- Anti-vibration foam
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- Surface testing

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