Datasheet LTC1292, LTC1297 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Single Chip 12-Bit Data Acquisition Systems |
| Seiten / Seite | 24 / 1 — FEATURES. DESCRIPTIO. Single Supply 5V Operation. Power Shutdown After … |
| Dateiformat / Größe | PDF / 325 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTIO. Single Supply 5V Operation. Power Shutdown After Each Conversion (LTC1297). KEY SPECIFICATIO S
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LTC1292/LTC1297 Single Chip 12-Bit Data Acquisition Systems
U FEATURES DESCRIPTIO
■
Single Supply 5V Operation
The LTC®1292/LTC1297 are data acquisition systems that ■
Power Shutdown After Each Conversion (LTC1297)
contain a 12-bit, switched-capacitor successive approxi- ■ Built-In Sample-and-Hold mation A/D, a differential input, sample-and-hold on the ■ 60kHz Maximum Throughput Rate (LTC1292) (+) input, and serial I/O. When the LTC1297 is idle between ■ Direct 3-Wire Interface to Most MPU Serial Ports and conversions it automatically powers down reducing the All MPU Parallel Ports supply current to 5µA, typically. The LTC1292 is capable ■ Analog Inputs Common Mode to Supply Rails of digitizing signals at a 60kHz rate and with the device’s excellent AC characteristics, it can be used for DSP appli-
U
cations. All these features are packaged in an 8-pin DIP
KEY SPECIFICATIO S
and are made possible using LTCMOSTM switched-capaci- tor technology. ■ Resolution: 12 Bits ■ Fast Conversion Time: 12µs Max Over Temp The serial I/O is designed to communicate without external ■ Low Supply Current: 6.0mA hardware to most MPU serial ports and all MPU parallel ■ Shutdown Supply Current: 5µA (LTC1297) I/O ports allowing data to be transmitted over three wires. Because of their accuracy, ease of use and small package size these devices are well suited for digitizing analog signals in remote applications where minimum number of interconnects and power consumption are important. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is trademark of Linear Technology Corporation
U TYPICAL APPLICATIO Power Supply Current 12-Bit Differential Input Data Acquisition System vs Sampling Frequency
10000 CS VCC 5V DO + 22µF 1000 MC68HC11 DIFFERENTIAL TANTALUM + +IN CLK SCK µA) INPUTS ( CC COMMON MODE LTC1297 1N4148 100 RANGE – –IN DOUT MISO 0V TO 5V* AVERAGE I GND VREF LT1027 8V TO 40V 10 + 4.7µF 1µF TANTALUM 1 1 10 100 1k 10k 100k fSAMPLE (Hz) *FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15mA LTC1297• TA02 PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES. CONVERSION RESULTS ARE NOT VALID WHEN ANY INPUT IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION ON OVERVOLTAGE PROTECTION IN LTC1292/7 TA01 THE APPLICATIONS INFORMATION. 12927fb 1
U FEATURES DESCRIPTIO
■
Single Supply 5V Operation
The LTC®1292/LTC1297 are data acquisition systems that ■
Power Shutdown After Each Conversion (LTC1297)
contain a 12-bit, switched-capacitor successive approxi- ■ Built-In Sample-and-Hold mation A/D, a differential input, sample-and-hold on the ■ 60kHz Maximum Throughput Rate (LTC1292) (+) input, and serial I/O. When the LTC1297 is idle between ■ Direct 3-Wire Interface to Most MPU Serial Ports and conversions it automatically powers down reducing the All MPU Parallel Ports supply current to 5µA, typically. The LTC1292 is capable ■ Analog Inputs Common Mode to Supply Rails of digitizing signals at a 60kHz rate and with the device’s excellent AC characteristics, it can be used for DSP appli-
U
cations. All these features are packaged in an 8-pin DIP
KEY SPECIFICATIO S
and are made possible using LTCMOSTM switched-capaci- tor technology. ■ Resolution: 12 Bits ■ Fast Conversion Time: 12µs Max Over Temp The serial I/O is designed to communicate without external ■ Low Supply Current: 6.0mA hardware to most MPU serial ports and all MPU parallel ■ Shutdown Supply Current: 5µA (LTC1297) I/O ports allowing data to be transmitted over three wires. Because of their accuracy, ease of use and small package size these devices are well suited for digitizing analog signals in remote applications where minimum number of interconnects and power consumption are important. , LTC and LT are registered trademarks of Linear Technology Corporation. LTCMOS is trademark of Linear Technology Corporation
U TYPICAL APPLICATIO Power Supply Current 12-Bit Differential Input Data Acquisition System vs Sampling Frequency
10000 CS VCC 5V DO + 22µF 1000 MC68HC11 DIFFERENTIAL TANTALUM + +IN CLK SCK µA) INPUTS ( CC COMMON MODE LTC1297 1N4148 100 RANGE – –IN DOUT MISO 0V TO 5V* AVERAGE I GND VREF LT1027 8V TO 40V 10 + 4.7µF 1µF TANTALUM 1 1 10 100 1k 10k 100k fSAMPLE (Hz) *FOR OVERVOLTAGE PROTECTION LIMIT THE INPUT CURRENT TO 15mA LTC1297• TA02 PER PIN OR CLAMP THE INPUTS TO VCC AND GND WITH 1N4148 DIODES. CONVERSION RESULTS ARE NOT VALID WHEN ANY INPUT IS OVERVOLTAGED (VIN < GND OR VIN > VCC). SEE SECTION ON OVERVOLTAGE PROTECTION IN LTC1292/7 TA01 THE APPLICATIONS INFORMATION. 12927fb 1