1FEATURES
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-8 only)
• Out-of-range Alert Function
• Automatic Power-down mode while not
converting
• Very small SOT-6 and VSSOP-8 packages
• ±8kV HBM ESD protection (SDA, SCL)

APPLICATIONS
• System Monitoring
• Peak Detection
• Portable Instruments
• Medical Instruments
• Test Equipment

KEY SPECIFICATIONS
• Resolution 10 bits; no missing codes
• Conversion Time 1μs (typ)
• INL & DNL ±0.5 LSB (max)
• Throughput Rate 188.9 kSPS (max)
• Power Consumption (at 22kSPS)
– 3V Supply 0.26 mW (typ)
– 5V Supply 0.78 mW (typ)

DESCRIPTION
The ADC101C021 is a low-power, monolithic, 10-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 ADC101C021
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 ADC101C021 comes in two packages: a small
SOT-6 package with an alert output, and an VSSOP-
8 package with an alert output and two address
selection inputs. The ADC101C027 comes in a small
SOT-6 package with an address selection input. The ADC101C027 provides three pin-selectable
addresses while the VSSOP-8 version of the
ADC101C021 provides nine pin-selectable
addresses. Pin-compatible alternatives to the SOT-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 ADC101C021 and ADC101C027 are part of a
family of pin-compatible ADCs that also provide 12
and 8 bit resolution. For 12-bit ADCs see the
ADC121C021 and ADC121C027. For 8-bit ADCs see
the ADC081C021 and ADC081C027.