RoHS Compliance Information	Size in Kbytes	Date
ADC121C021/ADC121C027 I 2 C-Compatible, 12-Bit Analog-to-Digital Converter with Alert Function	798 Kbytes	27-Apr-09	Download

Part Number

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Samples & Electronic Orders

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Type

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Peak Reflow

RoHS Report

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$US each

ADC121C02XEB

I2C-Compatible, 12-Bit Analog-to-Digital Converter (ADC) with Alert Function Evaluation Board

Full production

N/A

1+

$120.00

1

-

8 weeks

N/A

ADC121C027CIMK

TSOT

6

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.16

reel of 1000

X31C XTT

6 weeks

2000

ADC121C027CIMKX

TSOT

6

NOPB

1

260

RoHS

N/A

Full production

N/A

1K+

$1.16

reel of 3000

X31C XTT

6 weeks

10000

General 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 I 2C-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 I 2C 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 TSOT-6 package with an alert output, and an MSOP-8 package with an alert output and two address selection inputs. The ADC121C027 comes in a small TSOT-6 package with an address selection input. The ADC121C027 provides three pin-selectable addresses while the MSOP-8 version of the ADC121C021 provides nine pin-selectable addresses. Pin-compatible alternatives to the TSOT-6 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 guaranteed. 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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