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MAXIM New Products - MAX31820 & MAX11154
2013-08-12
MAX31820
1-Wire Ambient Temperature Sensor
Digital Temperature Sensor in TO-92 Package Ideal for Measuring Ambient Temperature
Description
The MAX31820 ambient temperature sensor provides 9-bit to 12-bit Celsius temperature measurements with ±0.5°C accuracy over a +10°C to +45°C temperature range. Over its entire -55°C to +125°C operating range, the device has ±2.0°C accuracy.
The device communicates over a 1-Wire® bus that, by definition, requires only one data line (and ground) for communication with a central microprocessor. In addition, the device can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. Requiring so few pins enables the device to be placed in a 3-pin TO-92 package. The form factor of this package allows the device to be placed above the board and thus measure the ambient temperature of a system, as opposed to the board temperature that a surface-mount package would measure.
Each MAX31820 has a unique 64-bit serial code, which allows multiple MAX31820 devices to function on the same 1-Wire bus. Therefore, it is simple to use one microprocessor to control many devices distributed over a large area.
The device communicates over a 1-Wire® bus that, by definition, requires only one data line (and ground) for communication with a central microprocessor. In addition, the device can derive power directly from the data line (“parasite power”), eliminating the need for an external power supply. Requiring so few pins enables the device to be placed in a 3-pin TO-92 package. The form factor of this package allows the device to be placed above the board and thus measure the ambient temperature of a system, as opposed to the board temperature that a surface-mount package would measure.
Each MAX31820 has a unique 64-bit serial code, which allows multiple MAX31820 devices to function on the same 1-Wire bus. Therefore, it is simple to use one microprocessor to control many devices distributed over a large area.
Key Features
- Unique 1-Wire Interface Requires Only One Port Pin for Communication
- Each Device has a Unique 64-Bit Serial Code Stored in On-Board ROM
- Multidrop Capability Simplifies Distributed Temperature-Sensing Applications
- Requires No External Components
- Can Be Powered from Data Line; 3.0V to 3.7V Power-Supply Range
- Measures Temperatures from -55°C to +125°C (-67°F to +257°F)
- ±0.5°C Accuracy from +10°C to +45°C
- Thermometer Resolution is User-Selectable from 9 Bits to 12 Bits
- Converts Temperature to 12-Bit Digital Word in 750ms (Max)
- User-Definable Nonvolatile (NV) Alarm Settings
- Alarm Search Command Identifies and Addresses Devices Whose Temperature is Outside Programmed Limits (Temperature Alarm Condition)
- Available in 3-Pin TO-92 Package
- TO-92 Package Allows Measurement of Ambient Temperature
- Software Compatible with the DS1822 and DS18B20
MAX11154
18-Bit, 500ksps, 0 to 5V SAR ADC with Internal Reference in TDFN
Industry's Smallest, 18-Bit SAR ADC with Internal Reference
Description
The MAX11154 18-bit, 500ksps, SAR ADC offers excellent AC and DC performance with unipolar input range, small size, and internal reference. The MAX11154 integrates an optional 6ppm/°C reference with internal buffer, saving the cost and space of an external reference.
This ADC achieves 93.5dB SNR and -105dB THD. The MAX11154 guarantees 18-bit no-missing codes.
The MAX11154 communicates using an SPI-compatible serial interface at 2.5V, 3V, 3.3V, or 5V logic. The serial interface can be used to daisy-chain multiple ADCs for multichannel applications and provides a busy indicator option for simplified system synchronization and timing.
The MAX11154 is offered in a 12-pin, 3mm x 3mm, TDFN package and is specified over the -40°C to +85°C temperature range.
This ADC achieves 93.5dB SNR and -105dB THD. The MAX11154 guarantees 18-bit no-missing codes.
The MAX11154 communicates using an SPI-compatible serial interface at 2.5V, 3V, 3.3V, or 5V logic. The serial interface can be used to daisy-chain multiple ADCs for multichannel applications and provides a busy indicator option for simplified system synchronization and timing.
The MAX11154 is offered in a 12-pin, 3mm x 3mm, TDFN package and is specified over the -40°C to +85°C temperature range.
Key Features
- High DC and AC Accuracy
- 18-bit Resolution with No Missing Codes
- SNR: 93.5dB
- THD: -105dB at 10kHz
- ±2 LSB INL (typ)
- ±0.5 LSB DNL (typ)
- 6ppm/°C Internal Reference
- Internal Reference Buffer
- Tiny 12-Pin 3mm x 3mm TDFN Package
- 5V Analog Supply
- 2.3V to 5V Digital Supply
- 23mW at 500ksps
- Shutdown Mode Feature Available
- 500ksps Throughput Rate
- No Pipeline Delay/Latency
- Flexible Industry-Standard Serial Interface
- SPI/QSPI™/MICROWIRE®/DSP-Compatible /
