PC-TEL, Inc.
59
1789N0DOCDAT01A-0399
PCT1789N DATA SHEET
D
IGITAL
F
ILTER
C
HARACTERISTICS
!
PRELIMINARY
PRELIMINARY
D
IGITAL
F
ILTER
C
HARACTERISTICS
Digital FIR Filter Characteristics
Given values are: V
A
= charge pump, V
D
= +5 V ± 5%; sample rate = 8 kHz; T
A
= 0 °C to 70 °C for K-grade, –40 °C to
+85 °C for B-grade.
Typical FIR filter characteristics for Fs = 8000Hz are shown in Figures 23, 24, 25, and 26.
Table 27 Digital FIR Filter Characteristics—Transmit and Receive
Digital IIR Filter Characteristics
Given values are: V
A
= charge pump, V
D
= +5 V ± 5%; sample rate = 8 kHz; T
A
= 0 °C to 70 °C for K-grade, –40 °C to
+85 °C for B-grade.
Typical IIR filter characteristics for Fs = 8000 Hz are shown in Figures 27, 28, 29, and 30. Figures 31 and 32 show
group delay versus input frequency.
Table 28 Digital IIR Filter Characteristics—Transmit and Receive
Figure 22 Test Circuit For Loop Characteristics
Parameter
Passband (0.1dB)
Symbol
F
(0.1dB)
F
(3dB)
Min
0
Typ
Max
3.3
Unit
kHz
Passband (3dB)
0
3.6
kHz
Passband ripple peak-to-peak
Stopband
Stopband attenuation
Group delay
–0.1
0.1
dB
kHz
dB
sec
4.4
–74
t
gd
12/Fs
Parameter
Passband (3dB)
Symbol
F
(3dB)
Min
0
Typ
Max
3.6
Unit
kHz
Passband ripple peak-to-peak
Stopband
Stopband attenuation
Group delay
–0.2
0.2
dB
kHz
dB
sec
4.4
–40
t
gd
1.6/Fs
PCT303L
Tip
Ring
10 μF
600
Note:
The remainder of the circuit is identical to the one shown in the typical application circuit.
I
L