BelaSigna 200
11.3 Analog Characteristics
Conditions: Temperature = 25°C, fSYS_CLK = 1.28MHz (internal), fMCLK = 1.28MHz, fSAMP = 16kHz, Vbat = 1.8V
Table 12: Analog Characteristics
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Input Stage
AI0, AI1, AI2, AI3 inputs
0dB preamp gain
Preamplifier gain 12, 15, 18, 21,
24, 27, 30dB
Unweighted, 20Hz to 8kHz BW,
30dB preamp gain
Unweighted, 20Hz to 8kHz BW,
0dB preamp gain
Input voltage
Vin
Rin
IRN
-1
1
Vp
kΩ
Input impedance5
Input referred noise
Input dynamic range
385
550
3
715
μVrms
dB
85
Unweighted, 20Hz to 8kHz BW,
0dB preamp gain,
input at 1 kHz
Input THD+N
-60
dB
dB
Preamplifier gain tolerance
(0, 12, 15, 18, 21, 24, 27, 30dB)
50% re. FS input at 1kHz
-1.5
-1
1.5
1
Output Stage
Line out output level
Line out output impedance
Vlo
Rlo
AI1
AI1
Vp
5
kΩ
AO0. Attenuator = 12, 15, 18, 21,
24, 27, 30dB
Output impedance6
Rao
8.9
12.8
16.6
kΩ
Unweighted, 100Hz to 22kHz BW,
0dB output attenuation
Unweighted, 100Hz to 22kHz BW,
0dB output attenuation,
input at 1kHz
Output dynamic range
75
dB
Output THD+N
-60
dB
dB
Output attenuator tolerance
(0,12,15,18,21,24,27,30dB)
50% re. FS input at 1kHz
-2
2
Low-Speed A/D
Input voltage
Peak input voltage, HV mode
-0.3
2.1
V
All channels sequentially
MCLK = 1.28MHz
Sampling frequency
Channel frequency
12.8
1.6
kHz
kHz
8 channels
Anti-Aliasing Filters (Input and Output)
Cut-off frequencies
7
10
80
13
1
kHz
dB
Passband flatness
-1
Stopband attenuation
dB
5 Depends slightly on the preamp gain
6 Depends strongly on the attenuator
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