SPRUJ55D September 2023 – July 2025 AM263P2 , AM263P2-Q1 , AM263P4 , AM263P4-Q1
This section describes the ADC Modes of Operation.
Single-ended Mode:
The ADC output code is a 12-bit value, but internally it can generates slightly more than 12 effective data bits. There are operating modes that can be selected to clip and/or shift the ADC output to utilize different regions in SE (single-ended) mode. These modes can be selected by utilizing bits adcX_cfg_1p1v[79:80]. The default mode (00) simply clips the output within 0 and 4095 to maintain a 12 bit value; this effectively limits the maximum input of the ADC to 3.2V.
| Input | Output | ||
| Equation | Input Voltage | Raw O/P | Default(00) |
| 3.3/4224 * 0 | 0 | 0 | 0 |
| 3.3/4224 * 1 | 0.00078125 | 1 | 1 |
| 3.3/4224 * 2 | 0.0015625 | 2 | 2 |
| ... | ... | ... | ... |
| 3.3/4224 * 127 | 0.09921875 | 127 | 127 |
| 3.3/4224 * 128 | 0.1 | 128 | 128 |
| 3.3/4224 * 129 | 0.10078125 | 129 | 129 |
| ... | ... | ... | ... |
| 3.3/4224 * 4094 | 3.1984375 | 4094 | 4094 |
| 3.3/4224 * 4095 | 3.19921875 | 4095 | 4095 |
| 3.3/4224 * 4096 | 3.2 | 4096 | 4095 |
| ... | ... | ... | ... |
| 3.3/4224 * 4221 | 3.29765625 | 4221 | 4095 |
| 3.3/4224 * 4222 | 3.2984375 | 4222 | 4095 |
| 3.3/4224 * 4223 | 3.29921875 | 4223 | 4095 |
Differential Mode:
In differential mode ADC output code can be estimated using the following equation
ADC Output Code = floor((VinPX-VinMX) / step_size + 2112
Where step_size=(VrefP-VrefM)*33/18*2/4096
Please note the addition factor is 2112 as the ADC generates a full-scale code in raw o/p mode as 4223. This 64 LSB shift can be compensated if adcX_cfg_1p1v[79:80] is set to 01 in differential mode
Input Configuration:
The ADC can be operated in both single-ended and differential mode; the inputs can be configuredaccording to ADC Input Selection Logic