LTC1277

Supply Voltage (VDD) ................................................ 7V
Negative Supply Voltage (VSS)
Bipolar Operation Only .......................... 6V to GND
Total Supply Voltage (VDD to VSS)
Bipolar Operation Only ....................................... 12V
Analog Input Voltage (Note 3)
Unipolar Operation ...................  0.3V to VDD + 0.3V
Bipolar Operation............... VSS  0.3V to VDD + 0.3V
Digital Input Voltage (Note 4)
Unipolar Operation ..............................  0.3V to 12V
Bipolar Operation.......................... VSS  0.3V to 12V
Digital Output Voltage
Unipolar Operation ...................  0.3V to VDD + 0.3V
Bipolar Operation......................  0.3V to VDD + 0.3V
Power Dissipation ............................................. 500mW
Operating Temperature Range
Commercial ............................................ 0°C to 70°C
Industrial ...........................................  40°C to 85°C
Storage Temperature Range ............ 65°C to 150°C
Lead Temperature (Soldering, 10 sec)............... 300°C


Description

The LTC®1274/LTC1277 are 8ms sampling 12-bit A/D converters which draw only 2mA (typ) from single 5V or ±5V supplies. These easy-to-use devices come complete with a 2ms sample-and-hold, a precision reference and an internally trimmed clock. Unipolar and bipolar conversion modes add to the flexibility of the ADCs. Two power-down modes are available in the LTC1277. In Nap mode, the LTC1277 draws only 180mA and the instant wake-up from Nap mode allows the device to be powered down even during brief inactive periods. In Sleep mode only 1mA will be drawn. A REFRDY signal is used to show the ADC is ready to sample after waking up from Sleep mode. 

The LTC1274 also provides the Sleep mode and REFRDY signal. The A/D converters convert 0V to 4.096V unipolar inputs from a single 5V supply or ±2.048V bipolar inputs from ±5V supplies. The LTC1274 has a single-ended input and a 12-bit parallel data format. 

It offers a differential input and a 2-byte read format. The bipolar mode is formatted as 2's complement for the LTC1274 and offset binary for the LTC1277.