SI3015-F-FS Silicon Laboratories Inc, SI3015-F-FS Datasheet - Page 42

• Manufacturer Part Number: SI3015-F-FS
• Description: IC ISOMODEM LINE-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Type: Chipsetr

Specifications of SI3015-F-FS

• Package / Case: 16-SOIC (3.9mm Width)
• Data Format: V.90
• Interface: Serial
• Voltage - Supply: 3.3 V ~ 5 V
• Mounting Type: Surface Mount
• Product: Modem Chip
• Supply Voltage (min): 3 V
• Supply Current: 26 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Baud Rates: -
• Lead Free Status / Rohs Status: Compliant

Si2400
7.2. Call Progress Filters
The programmable call progress filter coefficients are
located in DSP address locations 0x0010 through
0x0023. There are two independent 4th order filters A
and B, each consisting of two biquads, for a total of 20
coefficients. Coefficients are 14 bits (–8192 to 8191)
and are interpreted as, for example, b0 = value/4096,
thus giving a floating point value of approximately –2.0
to 2.0. Output of each biquad is calculated as
w[n] = k0 x[n] + a1 w[n – 1] + a2 w[n – 2]
y[n] = w[n] + b1 w[n – 1] + b2 w[n – 2].
The output of the filters is input to an energy detector
and then compared to a fixed threshold with hysteresis
(DSP register CPDL). Defaults shown are a bandpass
filter from 290–630 Hz (–3 dB). These registers are
located in the DSP and thus must be written in the same
manner described in “DSP Registers”.
The filters may be configured in either parallel or
cascade through SE6[6] (CPCD) with SE8 = 0x02, and
the output of filter B may be squared by selecting
SE6[7] (CPSQ) = 1
of the call progress filter structure.
42
CPCD
Filter Input
1
0
b
. Figure 13 shows a block diagram
CPSQ
Filter B
Filter A
Figure 13. Programmable Call Progress Filter Architecture
1
0
y = x
2
Energy
Detect
Energy
Detect
Rev. 1.3
0
DSP Register
CPCD
Address
1
0
0x001A
0x001B
0x001C
0x001D
0x001E
0x0010
0x0012
0x0013
0x0014
0x0015
0x0016
0x0017
0x0018
0x0019
0x001F
0x0020
0x0021
0x0022
0x0023
0x0011
Table 26. Call Progress Filters
B
A
20log
(A,B)
Max
10
Coefficient
(4096/CPDL) –34 dBm
A1_b1
A1_b2
A1_a1
A1_a2
A2_b1
A2_b2
A2_a1
A2_a2
B1_b1
B1_b2
B1_a1
B1_a2
B2_b1
B2_b2
B2_a1
B2_a2
A1_k0
A2_k0
B1_k0
B2_k0
Hysteresis
A
B
Default (dec)
A > B?
–8184
–3801
–3565
–8184
–3801
–3565
4096
7737
1236
4096
7109
4096
7737
1236
4096
7109
256
133
256
133
TDET