st72324bk STMicroelectronics, st72324bk Datasheet - Page 143

• Manufacturer Part Number: st72324bk
• Description: 3 V/5 V Range 8-bit Mcu With 4/8 Kbyte Rom, 10-bit Adc, Four Timers And Spi
• Manufacturer: STMicroelectronics

ST72323 ST72323L
11.12.1
Figure 85. Recommended C
1. This graph shows that depending on the input signal variation (f
Figure 86. Typical A/D converter application
Analog power supply and reference pins
Depending on the MCU pin count, the package may feature separate V
analog power supply pins. These pins supply power to the A/D converter cell and function
as the high and low reference voltages for the conversion. In some packages, V
V
and reference pads are internally bonded to the V
Separation of the digital and analog power pins allow board designers to improve A/D
performance. Conversion accuracy can be impacted by voltage drops and noise in the event
of heavily loaded or badly decoupled power supply lines (see
design
V
SSA
AIN
time and decreased to allow the use of a larger serial resistor (R
pins are not available (refer to
guidelines).
R
AIN
C
1000
100
AIN
0.1
10
1
AINx
0.01
AIN
& R
Section 2 on page
0.1
AIN
f
V
AIN
values
DD
(KHz)
V
0.6 V
V
0.6 V
T
T
(1)
1
DD
and V
AIN
Cain 10 nF
Cain 22 nF
Cain 47 nF
AIN)
12). In this case the analog supply
2 kΩ(max)
), C
I
±1 µA
.
L
AIN
SS
10
Section 11.12.2: General PCB
can be increased for stabilization
pins.
Electrical characteristics
10-bit A/D
conversion
AREF
and V
AREF
ST72XXX
SSA
143/167
C
12 pF
and
ADC