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 nine pin-selectable chip addresses (MSOP-8 only)
- Out-of-range Alert Function
- Automatic Power-down mode while not converting
- Very small TSOT-6 and MSOP-8 packages
- ±8kV HBM ESD protection (SDA, SCL)
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 anI2C-compatibleserial 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 TSOT-6 package with an alert output, and an MSOP-8 package with an alert output and two address selection inputs. TheADC121C027comes in a small TSOT-6 package with an address selection input. TheADC121C027provides 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.
TheADC121C021andADC121C027are part of a family of pin-compatible ADCs that also provide 8 and 10 bit resolution. For 8-bit ADCs see theADC081C021andADC081C027. For 10-bit ADCs see theADC101C021andADC101C027.
Key Specification
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Resolution
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12 bits; no missing codes
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Conversion Time
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1µs (typ)
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INL & DNL
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±1 LSB (max) (up to 22ksps)
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Throughput Rate
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188.9ksps (max)
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Power Consumption (at 22ksps)
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3V Supply
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0.26 mW (typ)
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5V Supply
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0.78 mW (typ)
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Applications
- System Monitoring
- Peak Detection
- Portable Instruments
- Medical Instruments
- Test Equipment