SNAD01B datasheet(3/31 Pages) SONIX

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SNAD01B

8-CHANNEL 8-BIT ADC

1. GENERAL DESCRIPTION

SNAD01B is a low cost serial 8-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 8-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. SNAD01B

has a synchronous 3-wires serial interface. Through this interface, the host CPU can easily control

SNAD01B.

During A-to-D conversion, the typical current consumption is 500uA at 25kHz throughput-rate

and +3V power supply. SNAD01B includes a power-down mode, which reduces maximum current

consumption to less than 1uA.

The reference voltage can be varied between 1V and +VCC, providing a corresponding input

voltage range of 0V to VREF. SNAD01B 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 300

µA@3v and can be enabled and disabled.

2. FEATURES

♦

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.

8-bits Resolution with (8-bits) No Missing Code.

3-Wire Serial Interface.

3. APPLICATIONS

♦

Battery-Powered Systems

Instrumentation

Portable Data Logging

Test Equipment

Data Acquisition

Process-Control Monitoring

Version: 1.3

July 31, 2003

SNAD01B Datasheet(PDF) 3 Page - SONiX Technology Company