Datasheet LTC1285, LTC1288 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages |
| Seiten / Seite | 24 / 1 — FEATURES. DESCRIPTION. 12-Bit Resolution. 8-Pin SO Plastic Package. Low … |
| Dateiformat / Größe | PDF / 355 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. 12-Bit Resolution. 8-Pin SO Plastic Package. Low Cost. Low Supply Current: 160. A Typ. APPLICATIONS
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LTC1285/LTC1288 3V Micropower Sampling 12-Bit A/D Converters in SO-8 Packages
U FEATURES DESCRIPTION
■
12-Bit Resolution
The LTC®1285/LTC1288 are 3V micropower, 12-bit, suc- ■
8-Pin SO Plastic Package
cessive approximation sampling A/D converters. They ■
Low Cost
typically draw only 160µA of supply current when con- ■
Low Supply Current: 160
µ
A Typ
verting and automatically power down to a typical supply ■ Auto Shutdown to 1nA Typ current of 1nA whenever they are not performing conver- ■ Guaranteed ±3/4LSB Max DNL sions. They are packaged in 8-pin SO packages and ■ Single Supply 3V to 6V Operation operate on 3V to 6V supplies. These 12-bit, switched- ■ Differential Inputs (LTC1285) capacitor, successive approximation ADCs include ■ 2-Channel MUX (LTC1288) sample-and-holds. The LTC1285 has a single differential ■ On-Chip Sample-and-Hold analog input. The LTC1288 offers a software selectable ■ 100µs Conversion Time 2-channel MUX. ■ Sampling Rates: On-chip serial ports allow efficient data transfer to a wide 7.5ksps (LTC1285) range of microprocessors and microcontrollers over three 6.6ksps (LTC1288) wires. This, coupled with micropower consumption, makes ■ I/O Compatible with SPI, Microwire, etc. remote location possible and facilitates transmitting data
U
through isolation barriers.
APPLICATIONS
These circuits can be used in ratiometric applications or ■ Pen Screen Digitizing with an external reference. The high impedance analog ■ Battery-Operated Systems inputs and the ability to operate with reduced spans (to ■ Remote Data Acquisition 1.5V full scale) allow direct connection to sensors and ■ Isolated Data Acquisition transducers in many applications, eliminating the need for ■ Battery Monitoring gain stages. ■ Temperature Measurement , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIONS N 12
µ
W, S0-8 Package, 12-Bit ADC Supply Current vs Sample Rate Samples at 200Hz and Runs Off a 3V Supply
1000 TA = 25°C V 1µF 3V CC = 2.7V VREF = 2.5V µA) fCLK = 120kHz 100 MPU (e.g., 8051) 1 8 V V REF CC P1.4 2 7 10 ANALOG INPUT +IN CLK P1.3 SUPPLY CURRENT ( 3 LTC1285 0V TO 3V RANGE 6 –IN DOUT P1.2 4 5 SERIAL DATA LINK GND CS/SHDN LTC1285/88 • TA01 1 0.1 1 10 100 SAMPLE FREQUENCY (kHz) LTC1285/88 • TA02 1
U FEATURES DESCRIPTION
■
12-Bit Resolution
The LTC®1285/LTC1288 are 3V micropower, 12-bit, suc- ■
8-Pin SO Plastic Package
cessive approximation sampling A/D converters. They ■
Low Cost
typically draw only 160µA of supply current when con- ■
Low Supply Current: 160
µ
A Typ
verting and automatically power down to a typical supply ■ Auto Shutdown to 1nA Typ current of 1nA whenever they are not performing conver- ■ Guaranteed ±3/4LSB Max DNL sions. They are packaged in 8-pin SO packages and ■ Single Supply 3V to 6V Operation operate on 3V to 6V supplies. These 12-bit, switched- ■ Differential Inputs (LTC1285) capacitor, successive approximation ADCs include ■ 2-Channel MUX (LTC1288) sample-and-holds. The LTC1285 has a single differential ■ On-Chip Sample-and-Hold analog input. The LTC1288 offers a software selectable ■ 100µs Conversion Time 2-channel MUX. ■ Sampling Rates: On-chip serial ports allow efficient data transfer to a wide 7.5ksps (LTC1285) range of microprocessors and microcontrollers over three 6.6ksps (LTC1288) wires. This, coupled with micropower consumption, makes ■ I/O Compatible with SPI, Microwire, etc. remote location possible and facilitates transmitting data
U
through isolation barriers.
APPLICATIONS
These circuits can be used in ratiometric applications or ■ Pen Screen Digitizing with an external reference. The high impedance analog ■ Battery-Operated Systems inputs and the ability to operate with reduced spans (to ■ Remote Data Acquisition 1.5V full scale) allow direct connection to sensors and ■ Isolated Data Acquisition transducers in many applications, eliminating the need for ■ Battery Monitoring gain stages. ■ Temperature Measurement , LTC and LT are registered trademarks of Linear Technology Corporation.
U TYPICAL APPLICATIONS N 12
µ
W, S0-8 Package, 12-Bit ADC Supply Current vs Sample Rate Samples at 200Hz and Runs Off a 3V Supply
1000 TA = 25°C V 1µF 3V CC = 2.7V VREF = 2.5V µA) fCLK = 120kHz 100 MPU (e.g., 8051) 1 8 V V REF CC P1.4 2 7 10 ANALOG INPUT +IN CLK P1.3 SUPPLY CURRENT ( 3 LTC1285 0V TO 3V RANGE 6 –IN DOUT P1.2 4 5 SERIAL DATA LINK GND CS/SHDN LTC1285/88 • TA01 1 0.1 1 10 100 SAMPLE FREQUENCY (kHz) LTC1285/88 • TA02 1