HT32F52231 Datasheet, PDF (39/50 Pages) Holtek Semiconductor Inc – 32-Bit ARM Cortex-M0+ Microcontroller

32-Bit ARM^® Cortex™-M0+ MCU
HT32F52231/HT32F52241/HT32F52331/HT32F52341
ADC Characteristics
Table 21. ADC Characteristics
TA = 25°C, unless otherwise specified.
Symbol
VDDA
VADCIN
VREF+
IADC
IADC_DN
fADC
fS
tDL
tS&H
tADCCONV
RI
CI
tSU
N
INL
DNL
EO
EG
Parameter
Conditions
Min
Operating Voltage
—
2.5
A/D Converter Input Voltage Range
—
0
A/D Converter Reference Voltage
—
—
Current Consumption
VDDA = 3.3V
—
Power Down Current Consumption VDDA = 3.3V
—
A/D Converter Clock
—
0.7
Sampling Rate
—
0.05
Data Latency
—
—
Sampling & Hold Time
—
—
A/D Converter Conversion Time
—
—
Input Sampling Switch Resistance
—
—
Input Sampling Capacitance
No pin/pad capacitance
included
—
Startup Up Time
—
—
Resolution
—
—
Integral Non-linearity Error
fS = 750kHz, VDDA = 3.3V —
Differential Non-linearity Error
fS = 750kHz, VDDA = 3.3V —
Offset Error
—
—
Gain Error
—
—
Typ Max Unit
3.3 3.6 V
— VREF+ V
VDDA VDDA
V
1 TBD mA
— 0.1 μA
— 16 MHz
— 1 MHz
12.5
—
1/fADC
Cycles
3.5
—
1/fADC
Cycles
16
—
1/fADC
Cycles
— 1 kΩ
16 — pF
— 1 μs
12 — bits
±2 ±5 LSB
±1 — LSB
— ±10 LSB
— ±10 LSB
Note: 1. Guaranteed by design, not tested in production.
2. The figure below shows the equivalent circuit of the A/D Converter Sample-and-Hold input
stage where CI is the storage capacitor, RI is the resistance of the sampling switch and RS
is the output impedance of the signal source VS. Normally the sampling phase duration is
approximately, 3.5/fADC. The capacitance, CI, must be charged within this time frame and it
must be ensured that the voltage at its terminals becomes sufficiently close to VS for accu-
racy. To guarantee this, RS is not allowed to have an arbitrarily large value.
Rev. 1.51
39 of 50
April 11, 2017