ST7538P STMicroelectronics, ST7538P Datasheet - Page 9

• Manufacturer Part Number: ST7538P
• Description: Telecom Line Management ICs 1/2 Duplex FSK Modem
• Manufacturer: STMicroelectronics
• Type: Single Chipr

Specifications of ST7538P

• Product: Modem Chip
• Supply Voltage (max): 5.25 V, 12.5 V
• Supply Voltage (min): 4.75 V, 7.5 V
• Supply Current: 5 mA, 370 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Package / Case: TQFP-44
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3
3.1 Carrier Frequencies
ST7538 is a multi frequency device: eight programmable Carrier Frequencies are available (see table 6).
Only one Carrier at a time can be used; anyway, it's possible to switch the communication channel during
the normal working Mode. Selecting the desired frequency in the Control Register the Transmission and
Reception filters are accordingly tuned.
Table 6. ST7538 Channels List
3.2 Baud Rates
ST7538 is a multi Baud rate device: four Baud Rate are available (See table 7).
Table 7. ST7538 mark and space tones frequency distance Vs Baud Rate and Deviation
Note: 1. Default value
FUNCTIONAL DESCRIPTION
2. Frequency deviation.
3. Deviation = ∆F / (Baud Rate)
4. Deviation 0.5 Not Allowed
Baud Rate [Baud]
2400
1200
4800
600
(1)
FCarrier
F7
F0
F1
F2
F3
F4
F5
F6
(1)
∆F
1200
1200
2400
2400
4800
600
600
(2)
(Hz)
(1)
F (KHz)
82.05
132.5
110
60
66
72
76
86
Deviation
1
0.5
0.5
0.5
1
1
1
(4)
(3)
ST7538
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