ADC

Operating conditions:
Table 1. Power Supply, Reference, and Input Range
Symbol Description Conditions Min. Typ. Max. Unit
VDD Supply Voltage 1.8 - 5.5 V
VREF Reference Voltage REFSEL = Internal reference 0.55 - VDD-0.5V V
REFSEL = VDD 1.8 - 5.5
REFSEL = External reference 1.1 - VDD
RIN Input resistance - TBD -
CIN Input capacitance SAMPCAP=5pF - 5 - pF
SAMPCAP=10pF - 10 -
VIN Input Voltage Range 0 - VREF V
IBAND Input Bandwidth 1.1V≤VREF - - 57.5 kHz
Table 2. Clock and Timing Characteristics
Symbol Description Conditions Min. Typ. Max. Unit
RS Sample Rate 1.1V≤VREF 15 - 115 ksps
1.1V≤VREF (8 bit resolution) 15 - 150
VREF=0.55V (10 bit) 7.5 - 20
fCLK_ADC ADC clock frequency VREF=0.55V (10 bit) 100 - 260 kHz
1.1V≤VREF (10 bit) 200 - 1500
1.1V≤VREF (8 bit resolution) 200 - 2000
Ts Sampling time 2 2 33 CLKADC cycles
TCONV Conversion time (latency) Sampling time = 2CLKADC 8.7 - 50 µs
TSTART Startup-time Internal Vref used - 22 - µs
Table 3. Accuracy Characteristics
Symbol Description Conditions Min. Typ. Max. Unit
Res Resolution   - 10 - bit
INL Integral Non Linearity REFSEL = Internal reference or VDD 0.55V≤VREF≤Vdd

fADC=15ksps
- 1.0 - LSB
1.1V≤VREF≤2.5

fADC=115ksps
- 1.0 -
2.5V<VREF≤Vdd

fADC=115ksps
- 1.3 -
REFSEL = External reference VREF= 1.8V

fADC=15ksps
- 0.9 -
VREF= 4.096V

fADC=15ksps
- 0.9 -
VREF= 1.8V

fADC=115ksps
- 1.0 -
VREF= 4.096V

fADC=115ksps
- 1.3 -
DNL(1) Dynamic Non Linearity REFSEL = Internal reference or VDD VREF=0.55V

fADC=15ksps
- 0.4 - LSB
1.1V≤VREF≤Vdd

fADC=15ksps
- 0.3 -
1.1V≤VREF≤2.5V

fADC=115ksps
- 0.4 -
2.5V≤VREF≤Vdd

fADC=115ksps
- 0.7 -
REFSEL = External reference VREF= 1.8V

fADC=15ksps
- 0.2 -
VREF= 4.096V

fADC=15ksps
- 0.2 -
VREF= 1.8V

fADC=115ksps
- 0.4 -
VREF= 4.096V

fADC=115ksps
- 0.6 -
EABS Absolute Accuracy REFSEL = Internal reference or VDD 0.55V≤VREF ≤1.1V

fADC=15ksps
- 3 - LSB
VREF = 1.1V

fADC≤115ksps
- 3 -
1.5V≤VREF ≤4.3V

fADC≤115ksps
- 2.5 -
VREF=VDD

fADC≤115ksps
- 2 -
REFSEL = External reference fADC ≤115ksps - 2 -
EGAIN Gain Error REFSEL = Internal reference or VDD VREF=1.1V

fADC = 115ksps
- 2±2.5 - LSB
VREF=VDD

fADC = 115ksps
- 2 -
REFSEL = External reference VREF=1.8V

fADC ≤ 115ksps
- 1.2 -
VREF=4.096V

fADC ≤ 115ksps
- 1.0 -
EOFF Offset Error REFSEL = Internal reference or VDD   - -0.5 - LSB
REFSEL = External reference   - -0.4 -
Note:
  1. 1.A DNL error of less than or equal to 1LSB guarantees a monotonic transfer function with no missing codes.