PCM1850
PCM1851
SLES108
−
MARCH 2004
www.ti.com
TYPICAL PERFORMANCE CURVES OF INTERNAL FILTER
DIGITAL FILTER
Decimation Filter Frequency Response
AMPLITUDE
vs
FREQUENCY
50
0
−10
AMPLITUDE
vs
FREQUENCY
0
−20
−30
Amplitude – dB
Amplitude – dB
−50
−40
−50
−60
−70
−100
−150
−80
−90
−200
0
8
16
Frequency [× f
S
]
24
32
−100
0.00
0.25
0.50
Frequency [× f
S
]
0.75
1.00
Figure 1. Overall Characteristics
AMPLITUDE
vs
FREQUENCY
0.2
Figure 2. Stop-Band Attenuation Characteristics
AMPLITUDE
vs
FREQUENCY
0
−1
–4.13 dB at 0.5×
0.0
−2
−3
Amplitude
−
dB
0.1
0.2
0.3
0.4
0.5
0.6
−4
−5
−6
−7
−8
−9
Amplitude – dB
−0.2
−0.4
−0.6
−0.8
−1.0
0.0
−10
0.45
0.47
0.49
0.51
0.53
0.55
Frequency [× f
S
]
Frequency [× f
S
]
Figure 3. Pass-Band Ripple Characteristics
Figure 4. Transition-Band Characteristics
All specifications at T
A
= 25°C, V
CC
= 5 V, V
DD
= 3.3 V, master mode, f
S
= 48 kHz, system clock = 256 f
S
, 24-bit data, unless otherwise noted
8
BURR-BROWN [ BURR-BROWN CORPORATION ]
