Table 4-42 ADC Characteristics (16-Bit Differential Mode)
over recommended operating conditions (unless otherwise noted)(6)| PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT |
| ADC conversion cycles(1) |
| 29.6 |
| 31 |
ADCCLKs |
| Power-up time (after setting ADCPWDNZ to first conversion) |
| | | 500 |
µs |
| Gain error |
| –64 |
±9 |
64 |
LSBs |
| Offset error(2) |
| –16 |
±9 |
16 |
LSBs |
| Channel-to-channel gain error |
| | ±6 |
| LSBs |
| Channel-to-channel offset error |
| | ±3 |
| LSBs |
| ADC-to-ADC gain error |
Identical VREFHI and VREFLO for all ADCs |
| ±6 |
| LSBs |
| ADC-to-ADC offset error |
Identical VREFHI and VREFLO for all ADCs |
| ±3 |
| LSBs |
| DNL(3) |
| > –1 |
±0.5 |
1 |
LSBs |
| INL |
| –3 |
±1.5 |
3 |
LSBs |
| SNR(4)(11) |
VREFHI = 2.5 V, fin = 10 kHz |
| 87.6 |
| dB |
| THD(4)(11) |
VREFHI = 2.5 V, fin = 10 kHz |
| –93.5 |
| dB |
| SFDR(4)(11) |
VREFHI = 2.5 V, fin = 10 kHz |
| 95.4 |
| dB |
| SINAD(4)(11) |
VREFHI = 2.5 V, fin = 10 kHz |
| 86.6 |
| dB |
| ENOB(4)(11) |
VREFHI = 2.5 V, fin = 10 kHz, single ADC(7) |
| 14.1 |
| bits |
| VREFHI = 2.5 V, fin = 10 kHz, synchronous ADCs(8) |
| 14.1 |
|
| VREFHI = 2.5 V, fin = 10 kHz, asynchronous ADCs(9) |
| Not supported |
|
| PSRR |
VDDA = 3.3-V DC + 200 mV DC up to Sine at 1 kHz |
| 77 |
| dB |
| PSRR |
VDDA = 3.3-V DC + 200 mV Sine at 800 kHz |
| 74 |
| dB |
| CMRR |
DC to 1 MHz |
| 60 |
| dB |
| VREFHI input current |
| | 190 |
| µA |
| ADC-to-ADC isolation(11)(5)(10) |
VREFHI = 2.5 V, synchronous ADCs(8) |
–2 |
| 2 |
LSBs |
| VREFHI = 2.5 V, asynchronous ADCs(9) |
| Not supported |
|
(2) Difference from conversion result 32768 when ADCINp = ADCINn = VREFCM.
(3) No missing codes.
(4) AC parameters will be impacted by clock source accuracy and jitter, this should be taken into account when selecting the clock source for the system. The clock source used for these parameters was a high-accuracy external clock fed through the PLL. The on-chip Internal Oscillator has higher jitter than an external crystal and these parameters will degrade if it is used as a clock source.
(5) Maximum DC code deviation due to operation of multiple ADCs simultaneously.
(6) Typical values are measured with VREFHI = 2.5 V and VREFLO = 0 V. Minimum and Maximum values are tested or characterized with VREFHI = 2.5 V and VREFLO = 0 V.
(7) One ADC operating while all other ADCs are idle.
(8) All ADCs operating with identical ADCCLK, S+H durations, triggers, and resolution.
(9) Any ADCs operating with heterogeneous ADCCLK, S+H durations, triggers, or resolution.
(10) Value based on characterization.
(11) I/O activity is minimized on pins adjacent to ADC input and VREFHI pins as part of best practices to reduce capacitive coupling and crosstalk.