Fusion Family of Mixed Signal FPGAs
Revision 4 2-123
Table 2-50 • ADC Characteristics in Direct Input Mode
Commercial Temperature Range Conditions, T
J
= 85°C (unless noted otherwise),
Typical: VCC33A = 3.3 V, VCC = 1.5 V
Parameter Description Condition Min. Typ. Max. Units
Direct Input using Analog Pad AV, AC, AT
VINADC Input Voltage (Direct Input) Refer to Table 3-2 on
page 3-3
CINADC Input Capacitance Channel not selected 7 pF
Channel selected but not
sampling
8pF
Channel selected and
sampling
18 pF
ZINADC Input Impedance 8-bit mode 2 k
10-bit mode 2 k
12-bit mode 2 k
Analog Reference Voltage VAREF
VAREF Accuracy T
J
= 25°C 2.537 2.56 2.583 V
Temperature Drift of
Internal Reference
65 ppm / °C
External Reference 2.527 VCC33A + 0.05 V
ADC Accuracy (using external reference)
1,2
DC Accuracy
TUE Total Unadjusted Error 8-bit mode 0.29 LSB
10-bit mode 0.72 LSB
12-bit mode 1.8 LSB
INL Integral Non-Linearity 8-bit mode 0.20 0.25 LSB
10-bit mode 0.32 0.43 LSB
12-bit mode 1.71 1.80 LSB
DNL Differential Non-Linearity
(no missing code)
8-bit mode 0.20 0.24 LSB
10-bit mode 0.60 0.65 LSB
12-bit mode 2.40 2.48 LSB
Offset Error 8-bit mode 0.01 0.17 LSB
10-bit mode 0.05 0.20 LSB
12-bit mode 0.20 0.40 LSB
Gain Error 8-bit mode 0.0004 0.003 LSB
10-bit mode 0.002 0.011 LSB
12-bit mode 0.007 0.044 LSB
Gain Error (with internal
reference)
All modes 2 % FSR
Notes:
1. Accuracy of the external reference is 2.56 V ± 4.6 mV.
2. Data is based on characterization.
3. The sample rate is time-shared among active analog inputs.