Features:
12-Bit Resolution
8-Pin SOIC Plastic Package
Low Cost
Low Supply Current: 250A Typ.
Auto Shutdown to 1nA Typ.
Guaranteed ±3/4LSB Max DNL
Single Supply 5V to 9V Operation
On-Chip Sample-and-Hold
60s Conversion Time
Sampling Rates:
12.5 ksps (LTC1286)
11.1 ksps (LTC1298)
I/O Compatible with SPI, Microwire, etc.
Differential Inputs (LTC1286)
2-Channel MUX (LTC1298)
3V Versions Available: LTC1285/LTC1288
Application
Battery-Operated Systems
Remote Data Acquisition
Battery Monitoring
Handheld Terminal Interface
Temperature Measurement
Isolated Data AcquisitionPinout
SpecificationsSupply Voltage (VCC) to GND................................... 12V
Voltage
Analog and Reference ...................0.3V to VCC + 0.3V
Digital Inputs.............................................0.3V to 12V
Digital Output.................................0.3V to VCC + 0.3V
Power Dissipation..............................................500mW
Operating Temperature Range
LTC1286C/LTC1298C.............................. 0°C to 70°C
LTC1286I/LTC1298I........................... 40°C to 85°C
Storage Temperature Range.............65°C to 150°C
Lead Temperature (Soldering, 10 sec.).............. 300°C
DescriptionThe LTC1286/LTC1298 are micropower, 12-bit, succes- sive approximation sampling A/D converters. They typi- cally draw only 250A of supply current when converting and automatically power down to a typical supply current of 1nA whenever they are not performing conversions. They are packaged in 8-pin SO packages and operate on 5V to 9V supplies. These 12-bit, switched-capacitor, suc- cessive approximation ADCs include sample-and-holds. The LTC1286 has a single differential analog input. The LTC1298 offers a software selectable 2-channel MUX.
On-chip serial ports allow efficient data transfer to a wide range of microprocessors and microcontrollers over three wires. This, coupled with micropower consumption, makes remote location possible and facilitates transmitting data through isolation barriers.
These circuits of LTC1286 can be used in ratiometric applications or with an external reference. The high impedance analog inputs and the ability to operate with reduced spans (to 1.5V full scale) allow direct connection to sensors and transducers in many applications, eliminating the need for gain stages.
LTC1286 Data Sheet
