AD1928
Rev. B | Page 6 of 32
DIGITAL FILTERS
Table 6.
Parameter Mode Factor Min Typ Max Unit
ADC DECIMATION FILTER
All modes, typ @ 48 kHz
Pass Band 0.4375 f
S
21 kHz
Pass-Band Ripple ±0.015 dB
Transition Band 0.5 f
S
24 kHz
Stop Band 0.5625 f
S
27 kHz
Stop-Band Attenuation 79 dB
Group Delay 22.9844/f
S
479 μs
DAC INTERPOLATION FILTER
Pass Band 48 kHz mode, typ @ 48 kHz 0.4535 f
S
22 kHz
96 kHz mode, typ @ 96 kHz 0.3646 f
S
35 kHz
192 kHz mode, typ @ 192 kHz 0.3646 f
S
70 kHz
Pass-Band Ripple 48 kHz mode, typ @ 48 kHz ±0.01 dB
96 kHz mode, typ @ 96 kHz ±0.05 dB
192 kHz mode, typ @ 192 kHz ±0.1 dB
Transition Band 48 kHz mode, typ @ 48 kHz 0.5 f
S
24 kHz
96 kHz mode, typ @ 96 kHz 0.5 f
S
48 kHz
192 kHz mode, typ @ 192 kHz 0.5 f
S
96 kHz
Stop Band 48 kHz mode, typ @ 48 kHz 0.5465 f
S
26 kHz
96 kHz mode, typ @ 96 kHz 0.6354 f
S
61 kHz
192 kHz mode, typ @ 192 kHz 0.6354 f
S
122 kHz
Stop-Band Attenuation 48 kHz mode, typ @ 48 kHz 70 dB
96 kHz mode, typ @ 96 kHz 70 dB
192 kHz mode, typ @ 192 kHz 70 dB
Group Delay 48 kHz mode, typ @ 48 kHz 25/f
S
521 μs
96 kHz mode, typ @ 96 kHz 11/f
S
115 μs
192 kHz mode, typ @ 192 kHz 8/f
S
42 μs
TIMING SPECIFICATIONS
−40°C < T
C
< 125°C, DVDD = 3.3 V ± 10%.
Table 7.
Parameter Condition Comments Min Max Unit
INPUT MASTER CLOCK (MCLK) AND
RESET
t
MH
MCLK duty cycle
DAC/ADC clock source = PLL clock @ 256 f
S
,
384 f
S
, 512 f
S
, and 768 f
S
40 60 %
DAC/ADC clock source = direct MCLK @ 512 f
S
(bypass on-chip PLL)
40 60 %
f
MCLK
MCLK frequency PLL mode, 256 f
S
reference 6.9 13.8 MHz
Direct 512 f
S
mode 27.6 MHz
t
PDR
RST
low
15 ns
t
PDRR
RST
recovery
Reset to active output 4096 t
MCLK
PLL
Lock Time
MCLK and LR
clock input
10 ms
256 f
S
VCO Clock Output Duty Cycle MCLKO/XO pin 40 60 %