PCT1789W DATA SHEET
PRELIMINARY
DIGITAL FILTER CHARACTERISTICS
!!
DIGITAL FILTER CHARACTERISTICS
Digital FIR Filter Characteristics
Given values are: VA = charge pump, VD = +3.3 V ± 5%; sample rate = 8 kHz; TA = 70 °C for K-grade, 85 °C for
B-grade.
Typical FIR filter characteristics for Fs = 8000Hz are shown in Figures 21, 22, 23, and 24.
Table 28 Digital FIR Filter Characteristics—Transmit and Receive
Parameter
Symbol
Min
Typ
Max
Unit
Passband (0.1dB)
F(0.1dB)
0
3.3
kHz
Passband (3dB)
F(3dB)
0
3.6
0.1
kHz
Passband ripple peak-to-peak
Stopband
–0.1
dB
kHz
dB
4.4
Stopband attenuation
Group delay
–74
tgd
12/Fs
sec
Digital IIR Filter Characteristics
Given values are: VA = charge pump, VD = +3.3 V ± 5%; sample rate = 8 kHz; TA = 70 °C for K-grade, 85 °C for
B-grade.
Typical IIR filter characteristics for Fs = 800 Hz are shown in Figures 25, 26, 27, and 28. Figures 29 and 30 show
group delay versus input frequency.
Table 29 Digital IIR Filter Characteristics—Transmit and Receive
Parameter
Symbol
Min
Typ
Max
Unit
Passband (3dB)
F(3dB)
0
3.6
kHz
Passband ripple peak-to-peak
Stopband
–0.2
0.2
dB
kHz
dB
4.4
Stopband attenuation
Group delay
–40
tgd
1.6/Fs
sec
Tip
600 W
PCT303W
Ring
IL
10 µF
Note: The remainder of the circuit is identical to the one shown in the Application Diagram.
PRELIMINARY
PC-TEL, Inc.
59
1789W0DOCDAT06A-0299
ETC [ ETC ]
