The LTC1298 is a 12-bit analog-to-digital converter (ADC). It is internally referenced to the 5-volt power supply, providing voltage measurements with 1.22-millivolt resolution. It has an internal sample-and-hold feature that prevents errors when it is used to measure rapidly changing signals.
The LTC1298 can be configured as a two-channel ADC or single-channel differential ADC. In two-channel mode, the selected channel’s voltage is measured relative to ground and returned as a value between 0 and 4095. In differential mode, the voltage difference between the two inputs is measured and returned as a value between 0 and 4095. Supply current is typically 250 μA when the unit is operating, 1 nA (one-billionth of an ampere) when it is not. The maximum clock rate for the LTC1298’s three-wire serial interface is 200 kHz, permitting up to 11,100 samples to be taken per second.
- Configureable as two-channel ADC or single-channel differential ADC
- Maximum clock rate is 200 kHz, allowing an 11,100/second sample rate
- 12-Bit resolution (0-4095)
- Low supply current
- 60 us conversion time
- 11.1 ksps sampling rate
- Voltage requirements: 4.5-9 VDC
- Current requirements: 250 uA typical with auto shutdown to 1 nA
- Communication: Synchronous Serial / SPI (3-wire)
- Package: DIP-8 (.300")
- Operating temp range: +32 to +158 °F (0 to +70 °C)