SNAD02C
8-CHANNEL 10-BIT ADC
1. GENERAL DESCRIPTION
SNAD02C 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. SNAD02C
has a synchronous 3-wires serial interface. Through this interface, the host CPU can easily control
SNAD02C.
During A-to-D conversion, the typical current consumption is 500uA at 25kHz throughput-rate and
+3V power supply. SNAD02C 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. SNAD02C 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 300µA@3v and can be enabled and disabled.
2. FEATURES
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Single Supply: 2.7V ~ 5.25V
Eight Analog/Digital Input Channels.
Internal 1.17v Bandgap Reference for Battery Monitoring. (Channel 7)
Low Power Consumption: typical operating current: 500uA @ 3V, Standby current <1uA.
Up to 25kHz Conversion Rate.
12-bits ADC with 8-bit effective number of bits
3-Wire Serial Interface.
3. APPLICATIONS
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Battery-Powered Systems
Instrumentation
Portable Data Logging
Test Equipment
Data Acquisition
Process-Control Monitoring
Digital Input Bus Extender
Version: 1.3
July 31, 2003
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SONIX [ SONIX TECHNOLOGY COMPANY ]
