The ADC input
characteristics are given by Table 6-17, Table 6-18, Figure 6-57, and Figure 6-58.
Table 6-17 Single-Ended Input Model Parameters (12-bit Resolution) Table 6-18 Single-Ended Input Model Parameters (16-bit Resolution) Table 6-19 Differential Input Model Parameters (12-bit Resolution) Table 6-20 Differential Input Model Parameters (16-bit Resolution) These input models 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 TMS320F28P65x 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 6-21 Per-Channel Parasitic Capacitance for 256-Ball ZEJ nFBGA| ADC CHANNEL | Cp (pF) |
|---|
| COMPARATOR DISABLED | COMPARATOR ENABLED |
|---|
| A0 | 4.6 | 7.1 |
| A1 | 2.7 | 5.2 |
| A2 | 2.7 | 5.2 |
| A3 | 2.7 | 5.2 |
| A4 | 2.1 | 4.6 |
| A5 | 2.3 | 4.8 |
| A6 | 2 | 4.5 |
| A7 | 2.7 | 5.2 |
| A8 | 2.6 | 5.1 |
| A9 | 2.8 | 5.3 |
| A10 | 2.7 | 5.2 |
| A11 | 2.6 | 5.1 |
| A14,B14,C14 | 3.9 | 6.4 |
| A15,B15,C15 | 3.2 | 5.7 |
| B0 | 11.5 | 14 |
| B1 | 3.1 | 5.6 |
| B2 | 2.4 | 4.9 |
| B3 | 2.7 | 5.2 |
| B4 | 2.6 | 5.1 |
| B5 | 2.1 | 4.6 |
| B6 | 2.4 | 4.9 |
| B7 | 2.6 | 5.1 |
| B8 | 2.6 | 5.1 |
| B9 | 2.5 | 5 |
| B10 | 3.6 | 6.1 |
| B11 | 2.8 | 5.3 |
| B13 | 1.9 | 4.4 |
| C0 | 2.7 | 5.2 |
| C1 | 2.7 | 5.2 |
| C2 | 2.7 | 5.2 |
| C3 | 3.1 | 5.6 |
| C4 | 2.3 | 4.8 |
| C5 | 2.5 | 5 |
| C6 | 1.8 | 4.3 |
| C7 | 2.3 | 4.8 |
| C8 | 1.1 | 3.6 |
| C9 | 1.2 | 3.7 |
| C10 | 1.1 | 3.6 |
| C11 | 1.7 | 4.2 |
| C13 | 1.9 | 4.4 |
Table 6-22 Per-Channel Parasitic Capacitance for 176-Pin PTP HLQFP| ADC CHANNEL | Cp (pF) |
|---|
| COMPARATOR DISABLED | COMPARATOR ENABLED |
|---|
| A0 | 4.6 | 7.1 |
| A1 | 2.7 | 5.2 |
| A2 | 2.7 | 5.2 |
| A3 | 2.7 | 5.2 |
| A4 | 2.1 | 4.6 |
| A5 | 2.3 | 4.8 |
| A6 | 2 | 4.5 |
| A7 | 2.7 | 5.2 |
| A8 | 2.6 | 5.1 |
| A9 | 2.8 | 5.3 |
| A10 | 2.7 | 5.2 |
| A11 | 2.6 | 5.1 |
| A14,B14,C14 | 3.9 | 6.4 |
| A15,B15,C15 | 3.2 | 5.7 |
| B0 | 11.5 | 14 |
| B1 | 3.1 | 5.6 |
| B2 | 2.4 | 4.9 |
| B3 | 2.7 | 5.2 |
| B4 | 2.6 | 5.1 |
| B5 | 2.1 | 4.6 |
| B6 | 2.4 | 4.9 |
| B7 | 2.6 | 5.1 |
| B8 | 2.6 | 5.1 |
| B9 | 2.5 | 5 |
| B10 | 3.6 | 6.1 |
| B11 | 2.8 | 5.3 |
| C0 | 2.7 | 5.2 |
| C1 | 2.7 | 5.2 |
| C2 | 2.7 | 5.2 |
| C3 | 3.1 | 5.6 |
| C4 | 2.3 | 4.8 |
| C5 | 2.5 | 5 |
| C6 | 1.8 | 4.3 |
| C7 | 2.3 | 4.8 |
| C8 | 1.1 | 3.6 |
| C9 | 1.2 | 3.7 |
Table 6-23 Per-Channel Parasitic Capacitance for 169-Ball NMR nFBGA| ADC CHANNEL | Cp (pF) |
|---|
| COMPARATOR DISABLED | COMPARATOR ENABLED |
|---|
| A0 | 4.6 | 7.1 |
| A1 | 2.7 | 5.2 |
| A2 | 2.7 | 5.2 |
| A3 | 2.7 | 5.2 |
| A4 | 2.1 | 4.6 |
| A5 | 2.3 | 4.8 |
| A6 | 2 | 4.5 |
| A7 | 2.7 | 5.2 |
| A8 | 2.6 | 5.1 |
| A9 | 2.8 | 5.3 |
| A10 | 2.7 | 5.2 |
| A11 | 2.6 | 5.1 |
| A14,B14,C14 | 3.9 | 6.4 |
| A15,B15,C15 | 3.2 | 5.7 |
| B0 | 11.5 | 14 |
| B1 | 3.1 | 5.6 |
| B2 | 2.4 | 4.9 |
| B3 | 2.7 | 5.2 |
| B4 | 2.6 | 5.1 |
| B5 | 2.1 | 4.6 |
| B6 | 2.4 | 4.9 |
| B7 | 2.6 | 5.1 |
| B8 | 2.6 | 5.1 |
| B9 | 2.5 | 5 |
| C0 | 2.7 | 5.2 |
| C1 | 2.7 | 5.2 |
| C2 | 2.7 | 5.2 |
| C3 | 3.1 | 5.6 |
| C4 | 2.3 | 4.8 |
| C5 | 2.5 | 5 |
| C6 | 1.8 | 4.3 |
| C7 | 2.3 | 4.8 |
| C8 | 1.1 | 3.6 |
| C9 | 1.2 | 3.7 |
Table 6-24 Per-Channel Parasitic Capacitance for 100-Pin PZP HTQFP| ADC CHANNEL | Cp (pF) |
|---|
| COMPARATOR DISABLED | COMPARATOR ENABLED |
|---|
| A0 | 4.6 | 7.1 |
| A1 | 2.7 | 5.2 |
| A2 | 2.7 | 5.2 |
| A3 | 2.7 | 5.2 |
| A4 | 2.1 | 4.6 |
| A5 | 2.3 | 4.8 |
| A6 | 2 | 4.5 |
| A10 | 2.7 | 5.2 |
| A11 | 2.6 | 5.1 |
| A14,B14,C14 | 3.9 | 6.4 |
| A15,B15,C15 | 3.2 | 5.7 |
| B0 | 11.5 | 14 |
| B1 | 3.1 | 5.6 |
| B2 | 2.4 | 4.9 |
| B3 | 2.7 | 5.2 |
| B6 | 2.4 | 4.9 |
| B7 | 2.6 | 5.1 |
| C0 | 2.7 | 5.2 |
| C1 | 2.7 | 5.2 |
| C2 | 2.7 | 5.2 |
| C3 | 3.1 | 5.6 |
| C4 | 2.3 | 4.8 |
| C5 | 2.5 | 5 |
| C6 | 1.8 | 4.3 |