Datasheet

PCM3010
SLES055 – NOVEMBER 2002
21
www.ti.com
Frequency [ f
S
]
–180
–160
–140
–120
–100
–80
–60
–40
–20
0
012345678
AMPLITUDE
vs
FREQUENCY
Amplitude – dB
Jitter – ps
90
95
100
105
110
115
120
125
0 100 200 300 400 500 600
DYNAMIC RANGE
vs
JITTER
Dynamic Range – dB
Figure 42. Quantization Noise Spectrum
( 64 Oversampling)
Figure 43. Jitter Dependence
( 64 Oversampling)
system clock
The system clock for the PCM3010 must be 128 f
S
, 192 f
S
, 256 f
S
, 384 f
S
, 512 f
S
or 768 f
S
, where f
S
is the audio
sampling rate, 16 kHz to 192 kHz. The PCM3010 detects 128 f
S
, 192 f
S
, 256 f
S
, 384 f
S
, 512 f
S
or 768 f
S
automatically with the built-in circuit. Operation at the 192-kHz sampling rate is available on the DAC only, and
when a system clock of 128 f
S
or 192 f
S
is detected, the ADC is disabled (DOUT = LOW). Table 1 lists the typical
system clock frequency, and Figure 44 illustrates the system clock timing.
Table 1. Typical System Clock
SAMPLING RATE
SYSTEM CLOCK FREQUENCY – MHz
FREQUENCY (f
S
) – LRCK
128 f
S
192 f
S
256 f
S
384 f
S
512 f
S
768 f
S
32 kHz – – 8.192 12.288 16.384 24.576
44.1 kHz – – 11.2896 16.9344 22.5792 33.8688
48 kHz – – 12.288 18.432 24.576 36.864
96 kHz – – 24.576 36.864 49.152 –
192 kHz 24.576
†
36.864
†
– – – –
†
DAC only.