The ADC input
characteristics are given by Table 6-17, Table 6-18, Figure 6-56, and Figure 6-57.
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 Report.
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 |