Z86D990 Datasheet, PDF (96/102 Pages) Zilog, Inc. – Low-Voltage Micro controllers with ADC

Z86D990/Z86D991 OTP and Z86L99X ROM
Low-Voltage Microcontrollers with ADC
89
Analog-to-Digital Converter Characteristics
Table 56 lists the analog-to-digital converter characteristics.
Table 56. Analog-to-Digital Converter Characteristics
Parameter
Minimum Typical
Resolution
8
Integral Nonlinearity
0.5
Differential Nonlinearity
0.5
Zero Error at 25 °C
Supply Voltage Range (OTP) 3.0
Supply Voltage Range (ROM) 2.3
Power Dissipation (No Load)
Clock Frequency (f ADC)
Input Voltage Range
Step Response
V_Ref–
ADC Input Capacitance
25
Vref Input Capacitance
25
V_Ref+ Range
V_Ref– Range
V_Ref–+2.0
AGND
Maximum
Units
bits
1
LSB
1
LSB
7.8
mV
5.5
V
5.5
V
1.2
mW
4
MHz
V_Ref+
V
2/(0.0021 X f ADC) s
40
pF
40
pF
AV_DD
V
V_Ref+–2.0
V
(V_Ref+)–(V_Ref–)
2.0
Temperature Range
0
AV_DD
V
70
°C
3-db Frequency
(0.0021 X f ADC)
Hz
Signal to Noise
47
db
ADC Output Code
Dout
Vref Input Source Impedance
1.0
kOhms
ADC Input Source Impedance
1.0
kOhms
Notes: Dout= [(Vin–V_Ref–)/(V_Ref+–V_Ref–)] X 256
f ADC = set in ADCCTRL configuration register
Step Response is the time to track the input if a step from V_Ref– to V_Ref+ is applied.
The ADC input is a switching capacitor that charges up to the applied input volt-
age whenever it is configured as an ADC input. If you switch it from digital mode to
PS003807-1002
PRELIMINARY