SI2493-C-FS Silicon Laboratories Inc, SI2493-C-FS Datasheet - Page 78

• Manufacturer Part Number: SI2493-C-FS
• Description: IC ISOMODEM SYSTEM-SIDE 16SOIC
• Manufacturer: Silicon Laboratories Inc

Specifications of SI2493-C-FS

• Mfg Application Notes: SI2493/57/34/15/04, Appl Note AN93
• Data Format: V.21, V.22, V.23, V.29, V.32, V.34, V.90, V.92, Bell 103, Bell 212A
• Baud Rates: 56k
• Interface: UART
• Voltage - Supply: 3 V ~ 3.6 V
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AN93
Example: The United States specifies a busy tone with on time from 450 to 550 ms and off time from 450 to
550 ms. Thus, minimum ON time equals 0.450 s; maximum ON time equals 0.550 s; minimum OFF time equals
0.450 sec, and maximum OFF time equals 0.550 sec. Busy Cadence Minimum Total Time = 0.450 s +
0.450 s = 0.900 s.
0.550 s = 1100 ms; so, BDLT = (1.10–0.900)(7200)d = 0x05A0, and BMOT = (0.450)(7200)d = 0x0CA8. The
hexadecimal values are stored in the appropriate registers using the AT:Uhh command where hh is the U-Register
number (hexadecimal address). Detection parameters can be wider than the minimum specifications. This is often
done in the modem defaults and other suggested settings so that one set of parameters can cover a large number
of different country requirements.
78
BPF Biquad
Minimum ON Time
Values
A0
B1
B2
A2
A1
K
K
(RMOT)
(BMOT)
Therefore,
Stage 1
0xC0F6
0x96AB
0x0020
0x7448
0x4000
—
—
Table 36. BPF Biquad Values (Continued)
Minimum Cadence
BMTT = (0.900)(7200)d = 0x1950.
TOTAL Time
(RMTT)
(BMTT)
Maximum Cadence
Figure 15. Cadence Timing
0xC0CB
Stage 2
0x0200
0x7802
0x4000
0x8359
TOTAL Time
—
—
400/440
Rev. 0.9
Cadence Delta
Stage 3
0xC2A4
0x73D5
0x8D93
0x0400
0x4000
(BDLT)
(RDLT)
Time
—
—
Maximum
0xC26B
Stage 4
0x85C1
0x75A7
0x0040
0x4000
—
—
total
time = 0.550 s
Output Scalar
0x0005
0x0008
—
—
—
—
—
+