The ADC input
characteristics are given by Table 6-19 and Figure 6-43.
Table 6-19 Input Model Parameters
This input model should be used with actual signal source impedance to
determine the acquisition window duration. For more information,
see the Choosing an Acquisition Window Duration section of the
Analog-to-Digital Converter (ADC) chapter in the TMS320F280015x
Real-Time Microcontrollers Technical Reference Manual.
For recommendations on improving ADC input circuits, see the ADC Input Circuit
Evaluation for C2000 MCUs Application Note.
Table 6-20 Per-Channel Parasitic
Capacitance for 80-Pin PN LQFP
| ADC CHANNEL |
Cp (pF) |
| COMPARATOR
DISABLED |
COMPARATOR
ENABLED |
| A0/C15/CMP1_DACL |
7.7 |
10.2 |
| A1 |
1.6 |
4.1 |
| A2/C9 |
1.5 |
4 |
| A3/C5 |
1.8 |
4.3 |
| A4/C14 |
2.4 |
4.9 |
| A5/C2 |
2 |
4.5 |
| A6 |
1.4 |
3.9 |
| A7/C3 |
1.9 |
4.4 |
| A8/C11 |
2.2 |
4.7 |
| A9/C8 |
2.3 |
4.8 |
| A10/C10 |
2 |
4.5 |
| A11/C0 |
2.4 |
4.9 |
| A12/C1 |
3.2 |
5.7 |
| A14/C4/ADCINCAL |
2.4 |
4.9 |
| A15/C7 |
3 |
5.5 |
| A16/C16 |
2.4 |
4.9 |
| A17/C17 |
2.7 |
5.2 |
| A18/C18 |
2.7 |
5.2 |
| A19/C19 |
2.7 |
5.2 |
| A20/C20 |
2.7 |
5.2 |
| C6 |
1.7 |
4.2 |
Table 6-21 Per-Channel Parasitic
Capacitance for 64-Pin PM LQFP
| ADC CHANNEL |
Cp (pF) |
| COMPARATOR
DISABLED |
COMPARATOR
ENABLED |
| A0/C15/CMP1_DACL |
7.7 |
10.2 |
| A1 |
1.6 |
4.1 |
| A2/C9 |
1.5 |
4 |
| A3/C5 |
1.8 |
4.3 |
| A4/C14 |
2.4 |
4.9 |
| A5/C2 |
2 |
4.5 |
| A6 |
1.4 |
3.9 |
| A7/C3 |
1.9 |
4.4 |
| A8/C11 |
2.2 |
4.7 |
| A9/C8 |
2.3 |
4.8 |
| A10/C10 |
2 |
4.5 |
| A11/C0 |
2.4 |
4.9 |
| A12/C1 |
3.2 |
5.7 |
| A14/C4/ADCINCAL |
2.4 |
4.9 |
| A15/C7 |
3 |
5.5 |
| A16/C16 |
2.4 |
4.9 |
| A17/C17 |
2.7 |
5.2 |
| A18/C18 |
2.7 |
5.2 |
| A19/C19 |
2.7 |
5.2 |
| A20/C20 |
2.7 |
5.2 |
| C6 |
1.7 |
4.2 |
Table 6-22 Per-Channel Parasitic
Capacitance for 48-Pin PHP HTQFP
| ADC CHANNEL |
Cp (pF) |
| COMPARATOR
DISABLED |
COMPARATOR
ENABLED |
| A0/C15/CMP1_DACL |
7.7 |
10.2 |
| A1 |
1.6 |
4.1 |
| A2/C9 |
1.5 |
4 |
| A3/C5 |
1.8 |
4.3 |
| A4/C14 |
2.4 |
4.9 |
| A5/C2 |
2 |
4.5 |
| A6/C6 |
3.1 |
8.1 |
| A7/C3 |
1.9 |
4.4 |
| A8/C11 |
2.2 |
4.7 |
| A9/C8 |
2.3 |
4.8 |
| A10/C10 |
2 |
4.5 |
| A11/C0 |
2.4 |
4.9 |
| A12/C1 |
3.2 |
5.7 |
| A14/A15/C4/C7/ADCINCAL |
5.4 |
10.4 |
| A16/C16 |
2.4 |
4.9 |
| A17/C17 |
2.7 |
5.2 |
| A19/C19 |
2.7 |
5.2 |
| A20/C20 |
2.7 |
5.2 |
Table 6-23 Per-Channel Parasitic
Capacitance for 32-Pin RHB VQFN
| ADC CHANNEL |
Cp (pF) |
| COMPARATOR
DISABLED |
COMPARATOR
ENABLED |
| A0/A1/C15/CMP1_DACL |
9.3 |
14.3 |
| A2/C9 |
1.5 |
4 |
| A3/C5 |
1.8 |
4.3 |
| A4/C14 |
2.4 |
4.9 |
| A5/C2/A11/C0 |
4.4 |
9.4 |
| A6/C6 |
3.1 |
8.1 |
| A7/C3/A12/C1 |
5.1 |
10.1 |
| A8/C11 |
2.2 |
4.7 |
| A9/C8/A10/C10 |
4.3 |
9.3 |
| A14/A15/C4/C7/ADCINCAL |
5.4 |
10.4 |
| A16/C16 |
2.4 |
4.9 |