Datasheet

ADC12DC105
SNAS469A –SEPTEMBER 2008–REVISED OCTOBER 2008 www.ti.com
Converter Electrical Characteristics (continued)
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, 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)(3)
Units
Parameter Test Conditions Typical
(4)
Limits
(Limits)
REFERENCE AND ANALOG INPUT CHARACTERISTICS
1.45 V (min)
V
CMO
Common Mode Output Voltage 1.5
1.56 V (max)
1.4 V (min)
V
CM
Analog Input Common Mode Voltage 1.5
1.6 V (max)
(CLK LOW) 8.5 pF
V
IN
Input Capacitance (each pin to
C
IN
V
IN
= 1.5 Vdc ± 0.5 V
GND)
(6)
(CLK HIGH) 3.5 pF
1.176 V (min)
V
REF
Internal Reference Voltage 1.2
1.224 V (max)
TC V
REF
Internal Reference Voltage Tempco −40°C ≤ T
A
≤ +85°C 18 ppm/°C
V
RP
Internal Reference Top 2 V
V
RN
Internal Reference Bottom 1 V
0.89 V (Min)
Internal Reference Accuracy (V
RP
-V
RN
) 1
1.06 V (max)
1.176 V (min)
EXTV
REF
External Reference Voltage 1.20
1.224 V (max)
(6) The input capacitance is the sum of the package/pin capacitance and the sample and hold circuit capacitance.
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, 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)
Units
Parameter Test Conditions Typical
(3)
Limits
(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
f
IN
= 70 MHz 70.5 dBFS
SNR Signal-to-Noise Ratio
f
IN
=170 MHz 69.1 68 dBFS
f
IN
= 240 MHz 68.5 dBFS
f
IN
= 10 MHz 90 dBFS
f
IN
= 70 MHz 86 dBFS
SFDR Spurious Free Dynamic Range
f
IN
= 170 MHz 83 78 dBFS
f
IN
= 240 MHz 81 dBFS
f
IN
= 10 MHz 11.5 Bits
f
IN
= 70 MHz 11.4 Bits
ENOB Effective Number of Bits
f
IN
= 170 MHz 11.2 10.9 Bits
f
IN
= 240 MHz 11 dBFS
(1) All voltages are measured with respect to GND = AGND = DRGND = 0V, unless otherwise specified.
(2) Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for
which the device is guaranteed to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test
conditions, see the Electrical Characteristics. The guaranteed 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.
(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 guaranteed.
(4) This parameter is specified in units of dBFS - indicating the value that would be attained with a full-scale input signal.
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