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