SNAD02 is a low cost serial 10-bits ADC with 8 individual input channels. Each channel
can be independently programmed to a digital or analog input mode. In the analog input
mode, this single-ended channel accepts an analog input signal from 0 to VREF and
converts the signal into 12-bit digital codes (with 10-bit accuracy guaranteed). In
the digital input mode, the channel can be treated as digital input port and the logic
level appears at the channel can be acquired. SNAD02 has a synchronous 3-wires serial
interface. Through this interface, the host CPU can easily control SNAD02. During
A-to-D conversion, the typical current consumption is 500uA at 25kHz throughput-rate
and +3V power supply. SNAD02 includes a power-down mode, which reduces maximum current
consumption less than 1uA. The reference voltage can be varied between 1V and +VCC,
providing a corresponding input voltage range of 0V to VREF. SNAD02 also has an on-chip
1.17V bandgap reference that can be utilized for constant voltage input (especially
for battery monitoring applications). The bandgap reference circuitry consumes 300mA@3v
and can be enabled and disabled.
