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DS1857
Dual Temperature-Controlled Resistors with External Temperature Input and Monitors
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Status
Active: In Production.
Description
The DS1857 dual temperature-controlled nonvolatile (NV) variable resistors with external temperature input
and monitors consists of two 50kΩ 256-position linear variable resistors, two analog monitor inputs (MON1,MON2), and an external temperature sensor input. The device provides an ideal method for setting and temperature compensating bias voltages and currents in control applications using minimal circuitry. The variable
resistor settings are stored in EEPROM memory and can be accessed over the 2-wire serial bus.
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Data Sheet
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An evaluation kit is available: DS1854EVKIT, DS1857EVKIT, DS1858EVKIT, DS1859EVKIT, DS185XEVKIT
Key Features
- Four Total Monitored Channels (Temperature,
VCC, MON1, MON2)
- Two External Analog Inputs (MON1, MON2)
- Interface to External Temperature Sensor (LM50)
- Two 50kΩ, Linear, 256-Position, Nonvolatile
Temperature-Controlled Variable Resistors
- Resistor Settings Changeable Every 2°C
- Access to Monitoring and ID Information
Configurable with Separate Device Addresses
- Resistor Disable (Open-Circuit) Function
- 2-Wire Serial Interface
- Three Address Lines for Multiple Devices
- Operates from a 3.3V or 5V Supply
- SFF-8472 Compatible
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Applications/Uses
- Diagnostic Monitoring
- Instrumentation and Industrial Controls
- Optical Transceivers
- Optical Transponders
- RF Power Amps
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Key Specifications:
| Fiber Monitoring and Control |
| Part Number |
ADCs |
Resolution
(bits) |
DACs/ Resistors |
FS Out
(kΩ) |
Steps |
Temp. Sensor |
Memory |
VSUPPLY
(V) |
Control Interface |
EV Kit |
Budgetary Price |
| See Notes |
| DS1857 |
4-Input Muxable |
12 |
2 Resistors |
50kohms |
256 |
External |
EEPROM |
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2-Wire |
Yes |
$4.12 @1k |
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See All Fiber Monitoring and Control (19)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Operating Circuit
More Information
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Information Index
Rev 2;
2004-06-07
This page last modified: 2009-10-13
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