ADC081C027| Datasheet

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ADC081C021/ADC081C027 I2C-Compatible, 8-Bit Analog-to-Digital Converter (ADC) with Alert

February 14, 2008

ADC081C021/ADC081C027 I2C-Compatible, 8-Bit Analog-to-Digital Converter (ADC) with Alert Function
General Description
The ADC081C021 is a low-power, monolithic, 8-bit, analog-to-digital converter(ADC) that operates from a +2.7 to 5.5V supply. The converter is based on a successive approximation register architecture with an internal track-and-hold circuit that can handle input frequencies up to 11MHz. The ADC081C021 operates from a single supply which also serves as the reference. The device features an I2C-compatible serial interface that operates in all three speed modes, including high speed mode (3.4MHz). The ADC's Alert feature provides an interrupt that is activated when the analog input violates a programmable upper or lower limit value. The device features an automatic conversion mode, which frees up the controller and I2C interface. In this mode, the ADC continuously monitors the analog input for an "out-of-range" condition and provides an interrupt if the measured voltage goes out-of-range. The ADC081C021 comes in a small TSOT-6 package with an alert output. The ADC081C027 comes in a small TSOT-6 package with an a
ddress selection input. The ADC081C027 provides three pin-selectable addresses. Pin-compatible alternatives are available with additional address options. Normal power consumption using a +3V or +5V supply is 0.26mW or 0.78mW, respectively. The automatic powerdown feature reduces the power consumption to less than 1uW while not converting. Operation over the industrial temperature range of -40 C to +105 C is guaranteed. Their low power consumption and small packages make this family of ADCs an excellent choice for use in battery operated equipment. The ADC081C021 and ADC081C027 are part of a family of pin-compatible ADCs that also provide 12 and 10 bit resolution. For 12-bit ADCs see the ADC121C021 and ADC121C027. For 10-bit ADCs see the ADC101C021 and ADC101C027.

Features
I2C-Compatible 2-wire Interface which supports standard
(100kHz), fast (400kHz), and high speed (3.4MHz) modes Extended power supply range (+2.7V to +5.5V) Up to four pin-selectable chip addresses Out-of-range Alert Function Automatic Power-down mode while not converting Very small 6-pin TSOT packages 8kV HBM ESD protection (SDA, SCL)

Key Specifications

Resolution 8 bits; no missing codes Conversion Time 1us (typ) INL & DNL 0.2 LSB (max) Throughput Rate 188.9kSPS (max) Power Consumption (at 22kSPS) 0.26 mW (typ) -- 3V Supply 0.78 mW (typ) -- 5V Supply

Applications

System Monitoring Peak Detection Portable Instruments Medical Instruments Test Equipment

Pin-Compatible Alternatives
All devices are fully pin and function compatible. Resolution ALERT Output ADDR Input 12-bit 10-bit 8-bit ADC121C021 ADC101C021 ADC081C021 ADC121C027 ADC101C027 ADC081C027

Connection Diagrams

30052101

30052102

I2C is a registered trademark of Phillips Corporation.

2008 National Semiconductor Corporation

300521

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