Cirrus Logic CS44600 - Manual (Page 11)

DS633F1 11
CS44600
PWM FILTER CHARACTERISTICS
(Logic “0” = GND = 0 V; Logic “1” = VLS = VLC; VD = 2.5 V; DAI_MCLK = 12.288 MHz; XTAL = 24.576 MHz; PWM
Switch Rate = 384 kHz; Fs = 32 kHz to 192 kHz; Measurement bandwidth is 10 Hz to 20 kHz unless otherwise
specified.)
12. Filter response is not production tested but is characterized and guaranteed by design.
13. XTAL = 49.152 MHz; PWM Switch Rate = 768 kHz; Fs = 96 kHz to 192 kHz.
14. The equation for the group delay through the sample rate converter with OSRATE = 0b is (8.5 / Fsi) + (10
/ Fso) ± (4.5 / Fsi). The equation for the group delay through the sample rate converter with OSRATE = 1b
is (8.5 / Fsi) + (20 / Fso) ± (4.5 / Fsi).
SWITCHING CHARACTERISTICS - XTI
(VD = 2.5 V, VDP = VLC = VLS = 3.3 V, VDX = 2.5 V to 5.0 V; Inputs: Logic 0 = GND, Logic 1 = VDX)
Parameter Unit Min Typ Max
Digital Filter Response (Note 12)
Passband
OSRATE = 0b
to -0.01 dB corner
to -3 dB corner
OSRATE = 1b (Note 13) to -0.01 dB corner
to -3 dB corner
0
0
0
0 -
-
-
- 1.6
24.0
3.3
44.5
kHz
kHz
kHz
kHz
Frequency Response
OSRATE = 0b 10 Hz to 20 kHz
OSRATE = 1b (Note 13) 10 Hz to 40 kHz
-0.8
-1.2 -
- +0.02
+0.02 dB
dB
Group Delay (Note 14) ms
De-emphasis Error Fs = 32 kHz
(Relative to 1 kHz) Fs = 44.1 kHz
Fs = 48 kHz
-
-
- -
-
- ±0.23
±0.14
±0.09 dB
dB
dB
Parameter Symbol Min Typ Max Unit
XTI period t
clki
18.518 --- 40.69 ns
XTI high time t
clkih
8.34 --- 22.38 ns
XTI low time t
clkil
8.34 --- 22.38 ns
XTI Duty Cycle 45 50 55 %
External Crystal operating frequency 24.576 --- 54 MHz
XTI
t
clkih
t
clkil
t
clki
Figure 2. XTI Timings