BelaSigna 200
11.4 Digital Characteristics
Conditions: Temperature = 25°C, fSYS_CLK = 1.28MHz (internal), fMCLK = 1.28MHz, fSAMP = 16kHz, Vbat = 1.8V
Table 13: Digital Characteristics
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Output Stage
Direct digital output load current
Direct digital output resistance
Ido
25
20
mA
Rdo
10
77
Ω
Direct digital output 0 dynamic
range
Unweighted, 100Hz to 22kHz BW
dB
dB
dB
dB
Unweighted, 100Hz to 10kHz BW
input at 1kHz
Unweighted, 100Hz to 22kHz BW
Direct digital output 0 THD+N
-63
75
Direct digital output 1 dynamic
range
Unweighted, 100Hz to 10kHz BW
input at 1kHz
Direct digital output 1 THD+N
-62
Internal Oscillator Characteristics
Clock frequency (internal)
Oscillator jitter
fSYS_CLK
1.28
0.4
MHz
ns
1.0
Oscillator start-up voltage
0.55
0.7
0.85
V
Time required for frequency change
of ±20%
Oscillator settling time
1
ms
Other
fSYS_CLK
VIH7
Clock frequency (external)
High-level input voltage
Low-level input voltage
HV mode
33
2.0
MHz
V
1.45
1.45
1.8
0
VIL7
0.35
V
High-level output voltage
Rout = 50ohm
Low-level output voltage
Rout = 50ohm
Input capacitance
(digital I/O pads)
Output capacitance
(digital I/O pads)
VOH7
Isource = 1mA
Isink = 1mA
1.8
V
V
VOL
0.05
0.1
5
CIN
pF
pF
COUT
Maximum load
100
Pull-up resistors
Rup
215
215
430
430
645
645
KΩ
kΩ
Pull-down resistors
Rdown
7 Digital low (0) represented below 20% of Vbat. Digital high (1) represented above 80% of Vbat.
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