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 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 I2Ccompatible

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.