Datasheet

V
A
AGND
To Internal Circuitry
I/O
ADC12C105
www.ti.com SNAS417B –MAY 2007–REVISED AUGUST 2007
Dynamic Converter Electrical Characteristics
Unless otherwise specified, the following specifications apply: AGND = DRGND = 0V, V
A
= +3.3V, V
DR
= +2.5V, Internal V
REF
= +1.2V, f
CLK
= 105 MHz, 50% Duty Cycle, DCS disabled, V
CM
= V
CMO
, C
L
= 5 pF/pin, . Typical values are for T
A
= 25°C.
Boldface limits apply for T
MIN
≤ T
A
≤ T
MAX
. All other limits apply for T
A
= 25°C
(1) (2)
Typical Units
Symbol Parameter Conditions Limits
(3)
(Limits)
(4)
DYNAMIC CONVERTER CHARACTERISTICS, A
IN
= -1dBFS
FPBW Full Power Bandwidth -1 dBFS Input, −3 dB Corner 1.0 GHz
f
IN
= 10 MHz 71 dBFS
SNR Signal-to-Noise Ratio f
IN
= 70 MHz 70.5 dBFS
f
IN
= 240 MHz 69 68.3 dBFS
f
IN
= 10 MHz 90 dBFS
SFDR Spurious Free Dynamic Range f
IN
= 70 MHz 86 dBFS
f
IN
= 240 MHz 82 78 dBFS
f
IN
= 10 MHz 11.5 Bits
ENOB Effective Number of Bits f
IN
= 70 MHz 11.3 Bits
f
IN
= 240 MHz 11.1 10.9 Bits
f
IN
= 10 MHz −86 dBFS
THD Total Harmonic Disortion f
IN
= 70 MHz −85 dBFS
f
IN
= 240 MHz −80 -74 dBFS
f
IN
= 10 MHz −95 dBFS
H2 Second Harmonic Distortion f
IN
= 70 MHz −90 dBFS
f
IN
= 240 MHz −86 -78 dBFS
f
IN
= 10 MHz −90 dBFS
H3 Third Harmonic Distortion f
IN
= 70 MHz −86 dBFS
f
IN
= 240 MHz −82 -78 dBFS
f
IN
= 10 MHz 70.8 dBFS
SINAD Signal-to-Noise and Distortion Ratio f
IN
= 70 MHz 70 dBFS
f
IN
= 240 MHz 68.6 67.4 dBFS
f
IN
= 19.5 MHz and 20.5MHz,
IMD Intermodulation Distortion -82 dBFS
each -7 dBFS
(1) The inputs are protected as shown below. Input voltage magnitudes above V
A
or below GND will not damage this device, provided
current is limited per Absolute Maximum Ratings, Note 4. However, errors in the A/D conversion can occur if the input goes above 2.6V
or below GND as described in the Operating Ratings section.
(2) With a full scale differential input of 2V
P-P
, the 12-bit LSB is 488 µV.
(3) Typical figures are at T
A
= 25°C and represent most likely parametric norms at the time of product characterization. The typical
specifications are not ensured.
(4) Parameters specified in dBFS indicate the value that would be attained with a full-scale input signal.
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