Datasheet

I/O
GND
TO INTERNAL
CIRCUITRY
ADC121C021, ADC121C021Q, ADC121C027
www.ti.com SNAS415F –JANUARY 2008–REVISED MARCH 2013
Operating Ratings
(1)(2)
Operating Temperature Range −40°C ≤ T
A
≤ +105°C
Supply Voltage, V
A
+2.7V to 5.5V
Analog Input Voltage, V
IN
0V to V
A
Digital Input Voltage
(3)
0V to 5.5V
Sample Rate up to 188.9 ksps
(1) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is functional, but do not ensure specific performance limits. For ensured specifications and test conditions, see the
Electrical Characteristics. The ensured specifications apply only for the test conditions listed. Some performance characteristics may
degrade when the device is not operated under the listed test conditions. Operation of the device beyond the maximum Operating
Ratings is not recommended.
(2) All voltages are measured with respect to GND = 0V, unless otherwise specified.
(3) The inputs are protected as shown below. Input voltage magnitudes up to 5.5V, regardless of V
A
, will not cause errors in the conversion
result. For example, if V
A
is 3V, the digital input pins can be driven with a 5V logic device.
Package Thermal Resistances
(1)(2)
Package θ
JA
6-Lead SOT 250°C/W
8-Lead VSSOP 200°C/W
(1) Soldering process must comply with Reflow Temperature Profile specifications.
(2) Reflow temperature profiles are different for lead-free packages.
Electrical Characteristics
The following specifications apply for V
A
= +2.7V to +5.5V, GND = 0V, f
SCL
up to 3.4MHz, f
IN
= 1kHz for f
SCL
up to 400kHz,
f
IN
= 10kHz for f
SCL
= 3.4MHz unless otherwise noted. Boldface limits apply for T
A
= T
MIN
to T
MAX
: all other limits T
A
= 25°C
unless otherwise noted.
(1)
Symbol Parameter Conditions Typical
(2)
Limits
(2)
Units (Limits)
STATIC CONVERTER CHARACTERISTICS
Resolution with No Missing Codes 12 Bits
V
A
= +2.7V to +3.6V, f
SCL
up to 400kHz
(3)
±0.5 ±1 LSB (max)
Integral Non-Linearity (End Point
INL +1.2 LSB
Method)
V
A
= +2.7V to +5.5V. f
SCL
up to 3.4MHz
−0.9 LSB
+0.5 +1 LSB (max)
V
A
= +2.7V to +3.6V, f
SCL
up to 400kHz
(3)
−0.5 −0.9 LSB (min)
DNL Differential Non-Linearity
+1.3 LSB
V
A
= +2.7V to +5.5V, f
SCL
up to 3.4MHz
−0.9 LSB
V
A
= +2.7V to +3.6V, f
SCL
up to 400kHz
(3)
+0.1 ±1.6 LSB (max)
V
OFF
Offset Error
V
A
= +2.7V to +5.5V. f
SCL
up to 3.4MHz +1.4 LSB
GE Gain Error -0.8 ±6 LSB (max)
(1) To ensure accuracy, it is required that V
A
be well bypassed and free of noise.
(2) Typical figures are at T
J
= 25°C, and represent most likely parametric norms. Test limits are specified to TI's AOQL (Average Outgoing
Quality Level).
(3) The ADC will meet Minimum/Maximum specifications for f
SCL
up to 3.4MHz and V
A
= 2.7V to 3.6V when operating in the Quiet Interface
Mode (See Quiet Interface Mode).
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