ADC12DC105_14 Datasheet, PDF (6/24 Pages) Texas Instruments – Dual 12-Bit, 105 MSPS A/D Converter with CMOS Outputs

ADC12DC105
SNAS469A – SEPTEMBER 2008 – REVISED OCTOBER 2008
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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)
Parameter
Test Conditions
Typical⁽⁴⁾ Limits
Units
(Limits)
REFERENCE AND ANALOG INPUT CHARACTERISTICS
V_CMO
Common Mode Output Voltage
1.5
1.45
1.56
V (min)
V (max)
V_CM
Analog Input Common Mode Voltage
1.5
1.4
1.6
V (min)
V (max)
C_IN
V_IN Input Capacitance (each pin to
GND) ⁽⁶⁾
(CLK LOW)
V_IN = 1.5 Vdc ± 0.5 V _{(CLK HIGH)}
8.5
3.5
pF
pF
V_REF
Internal Reference Voltage
1.2
1.176
1.224
V (min)
V (max)
TC V_REF
V_RP
V_RN
Internal Reference Voltage Tempco
Internal Reference Top
Internal Reference Bottom
Internal Reference Accuracy
−40°C ≤ T_A ≤ +85°C
(V_RP-V_RN)
18
2
1
1
0.89
1.06
ppm/°C
V
V
V (Min)
V (max)
EXTV_REF External Reference Voltage
1.20
1.176
1.224
V (min)
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⁾
Parameter
Test Conditions
Typical⁽³⁾ Limits
Units
(Limits) ⁽⁴⁾
DYNAMIC CONVERTER CHARACTERISTICS, A_IN= -1dBFS
FPBW Full Power Bandwidth
-1 dBFS Input, −3 dB Corner
1.0
GHz
SNR
Signal-to-Noise Ratio
SFDR Spurious Free Dynamic Range
ENOB Effective Number of Bits
f_IN = 10 MHz
f_IN = 70 MHz
f_IN =170 MHz
f_IN = 240 MHz
f_IN = 10 MHz
f_IN = 70 MHz
f_IN = 170 MHz
f_IN = 240 MHz
f_IN = 10 MHz
f_IN = 70 MHz
f_IN = 170 MHz
f_IN = 240 MHz
71
70.5
69.1
68
68.5
90
86
83
78
81
11.5
11.4
11.2
10.9
11
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
Bits
Bits
Bits
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.
6
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