ADC081C027CIMK Datasheet, PDF (1/32 Pages) National Semiconductor (TI) – ADC081C021/ADC081C027 I2C-Compatible, 8-Bit Analog-to-Digital Converter (ADC) with Alert Function

May 5, 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 approx-
imation 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 low-
er 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 mea-
sured 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 address selection input. The ADC081C027
provides three pin-selectable addresses. Pin-compatible al-
ternatives are available with additional address options.
Normal power consumption using a +3V or +5V supply is
0.26mW or 0.78mW, respectively. The automatic power-
down feature reduces the power consumption to less than
1µW while not converting. Operation over the industrial tem-
perature 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 equip-
ment.
The ADC081C021 and ADC081C027 are part of a family of
pin-compatible ADCs that also provide 12 and 10 bit resolu-
tion. 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}
1µs (typ)
■ ^{INL & DNL}
±0.2 LSB (max)
■ ^{Throughput Rate}
188.9kSPS (max)
■ ^{Power Consumption (at 22kSPS)}
— 3V Supply
0.26 mW (typ)
— 5V Supply
0.78 mW (typ)
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
ADC121C021
ADC121C027
10-bit
ADC101C021
ADC101C027
8-bit
ADC081C021
ADC081C027
Connection Diagrams
30052101
I2C^® is a registered trademark of Phillips Corporation.
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