[AK4636]
R1
75Ω
VIN
CLAMP
LPF
GCA
VOUT
+6dB
R2
75Ω
-1dB ~ +10.5dB
Step 0.5dB
CL1
CL2
Figure 3. Load Capacitance CL1 and C L2
FILTER CHRACTERISTICS
(Ta = −30 ~ 85°C; AVDD = 2.6 ∼ 3.6V, DVDD = 1.6 ∼ 3.6V, SVDD = 2.6 ∼ 3.6V, VVDD = 2.8 ∼ 3.6V; fs = 8kHz)
Parameter
Symbol
min
typ
max
Units
ADC Digital Filter (Decimation LPF):
Passband
(Note 19) ±0.16dB
−0.66dB
PB
0
-
-
-
4.7
-
-
3.5
3.6
4.0
-
3.0
-
-
-
kHz
kHz
kHz
kHz
kHz
dB
−1.1dB
−6.9dB
Stopband
Passband Ripple
(Note 19)
SB
PR
-
-
±0.1
Stopband Attenuation
SA
GD
ΔGD
73
-
-
-
16
0
-
-
-
dB
1/fs
μs
Group Delay
(Note 20)
Group Delay Distortion
DAC Digital Filter (Decimation LPF):
Passband
(Note 19)
±0.16dB
−0.54dB
−1.0dB
−6.7dB
PB
0
-
-
-
4.7
-
-
3.5
3.6
4.0
-
3.0
-
-
-
kHz
kHz
Stopband
Passband Ripple
(Note 19)
SB
PR
-
kHz
dB
-
±0.1
Stopband Attenuation
SA
GD
ΔGD
73
-
-
-
16
0
-
-
-
dB
1/fs
μs
Group Delay
(Note 20)
Group Delay Distortion
DAC Digital Filter + Analog Filter:
Frequency Response: 0 ∼ 3.4kHz
FR
-
±1.0
-
dB
Note 19. The passband and stopband frequencies are proportional to fs (system sampling rate).
For example, ADC of PB = 3.6kHz is 0.45*fs (@ −1.0dB). A reference of frequency response is 1kHz.
Note 20. The calculated delay time caused by digital filtering. This time is from the input of analog signal to setting of the
16-bit data of a channel from the input register to the output register of the ADC. For the DAC, this time is from
setting the 16-bit data of a channel from the input register to the output of analog signal. When there is not a
phase change with the IIR filter, group delay of the programmable filter (primary HPF + primary LPF + 4-band
Equalizer + ALC) increases for 3/fs than a value above mentioned.
MS1012-E-01
2010/08
- 12 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
