Datasheet
ADC121C021, ADC121C021Q, ADC121C027
SNAS415F –JANUARY 2008–REVISED MARCH 2013
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Electrical Characteristics (continued)
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)
DYNAMIC CONVERTER CHARACTERISTICS
V
A
= +2.7V to +3.6V 11.7 11.3 Bits (min)
ENOB Effective Number of Bits
V
A
= +3.6V to +5.5V 11.5 Bits (min)
V
A
= +2.7V to +3.6V 72.5 70.4 dB (min)
SNR Signal-to-Noise Ratio
V
A
= +3.6V to +5.5V 71 dB (min)
V
A
= +2.7V to +3.6V −92 −78 dB (max)
THD Total Harmonic Distortion
V
A
= +3.6V to +5.5V −87 dB (max)
V
A
= +2.7V to +3.6V 72.6 70 dB (min)
SINAD Signal-to-Noise Plus Distortion Ratio
V
A
= +3.6V to +5.5V 71 dB (min)
V
A
= +2.7V to +3.6V 90 76 dB (min)
SFDR Spurious-Free Dynamic Range
V
A
= +3.6V to +5.5V 87 dB (min)
V
A
= +3.0V,
−89 dB
f
a
= 1.035 kHz, f
b
= 1.135 kHz
Intermodulation Distortion, Second
Order Terms (IMD
2
)
V
A
= +5.0V,
−91 dB
f
a
= 1.035 kHz, f
b
= 1.135 kHz
IMD
V
A
= +3.0V,
−88 dB
f
a
= 1.035 kHz, f
b
= 1.135 kHz
Intermodulation Distortion, Third
Order Terms (IMD
3
)
V
A
= +5.0V,
−88 dB
f
a
= 1.035 kHz, f
b
= 1.135 kHz
V
A
= +3.0V 8 MHz
FPBW Full Power Bandwidth (−3dB)
V
A
= +5.0V 11 MHz
ANALOG INPUT CHARACTERISTICS
V
IN
Input Range 0 to V
A
V
I
DCL
DC Leakage Current
(4)
±1 µA (max)
Track Mode 30 pF
C
INA
Input Capacitance
Hold Mode 3 pF
SERIAL INTERFACE INPUT CHARACTERISTICS (SCL, SDA)
V
IH
Input High Voltage 0.7 x V
A
V (min)
V
IL
Input Low Voltage 0.3 x V
A
V (max)
I
IN
Input Current
(4)
±1 µA (max)
C
IN
Input Pin Capacitance 3 pF
V
HYST
Input Hysteresis 0.1 x V
A
V (min)
ADDRESS SELECTION INPUT CHARACTERISTICS (ADDR)
V
IH
Input High Voltage V
A
- 0.5V V (min)
V
IL
Input Low Voltage 0.5 V (max)
I
IN
Input Current
(4)
±1 µA (max)
LOGIC OUTPUT CHARACTERISTICS, OPEN-DRAIN (SDA, ALERT)
I
SINK
= 3 mA 0.4 V (max)
V
OL
Output Low Voltage
I
SINK
= 6 mA 0.6 V (max)
High Impedance Output Leakage
I
OZ
±1 µA (max)
Current
(4)
Output Coding Straight (Natural) Binary
(4) This parameter is ensured by design and/or characterization and is not tested in production.
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