ADC121C021_14 Datasheet, PDF (1/44 Pages) Texas Instruments – I2C-Compatible, 12-Bit Analog-to-Digital Converter with Alert Function

ADC121C021, ADC121C021Q, ADC121C027
www.ti.com
SNAS415F – JANUARY 2008 – REVISED MARCH 2013
ADC121C021/ADC121C021Q/ADC121C027 I²C-Compatible, 12-Bit Analog-to-Digital
Converter with Alert Function
Check for Samples: ADC121C021, ADC121C021Q, ADC121C027
FEATURES
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•23 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 Nine Pin-Selectable Chip Addresses
(VSSOP Only)
• Out-of-Range Alert Function
• Automatic Power-Down Mode while Not
Converting
• Very Small 6-Pin SOT and 8-Pin VSSOP
Packages
• ADC121C021Q is an Automotive Grade
Product that is AEC-Q100 Grade 2 Qualified
APPLICATIONS
• System Monitoring
• Peak Detection
• Portable Instruments
• Medical Instruments
• Test Equipment
• Automotive
KEY SPECIFICATIONS
• Resolution: 12 Bits (No Missing Codes)
• Conversion Time: 1µs (Typ)
• INL & DNL: ±1 LSB (Max) (Up to 22ksps)
• Throughput Rate: 188.9 ksps (Max)
• Power Consumption (at 22 ksps)
– 3V Supply: 0.26 mW (Typ)
– 5v Supply: 0.78 mW (Typ)
DESCRIPTION
These converters are low-power, monolithic, 12-bit,
analog-to-digital converters (ADCs) that operates
from a +2.7 to 5.5V supply. The converter is based
upon a successive approximation register
architecture with an internal track-and-hold circuit that
can handle input frequencies up to 11MHz. These
converters operate 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 ADC121C021'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 ADC121C021 comes in two packages: a small 6-
pin SOT package with an alert output, and an 8-pin
VSSOP package with an alert output and two
address selection inputs. The ADC121C021Q is
available in a 6-pin SOT package. The ADC121C027
comes in a small 6-pin SOT package with an address
selection input. The ADC121C027 provides three pin-
selectable addresses while the 8-pin VSSOP version
of the ADC121C021 provides nine pin-selectable
addresses. Pin-compatible alternatives to the 6-pin
SOT options 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 temperature range of
−40°C to +105°C is ensured. Their low power
consumption and small packages make this family of
ADCs an excellent choice for use in battery operated
equipment.
The ADC121C021 and ADC121C027 are part of a
family of pin-compatible ADCs that also provide 8 and
10 bit resolution. For 8-bit ADCs see the
ADC081C021 and ADC081C027. For 10-bit ADCs
see the ADC101C021 and ADC101C027.
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Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
I²C is a registered trademark of Phillips Corporation..
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All other trademarks are the property of their respective owners.
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PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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