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