SI3068-B-FT Silicon Laboratories Inc, SI3068-B-FT Datasheet - Page 13

• Manufacturer Part Number: SI3068-B-FT
• Description: IC DAA FCC+ EMBEDDED 10SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: -r

Specifications of SI3068-B-FT

• Function: Direct Access Arrangement (DAA)
• Interface: *
• Number Of Circuits: 1
• Voltage - Supply: *
• Current - Supply: *
• Power (watts): *
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: *
• Package / Case: *
• Includes: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

4.6. Off-Hook
The software generates an off-hook command by
setting the OH bit (Register 5, bit 0). This seizes the line
for incoming/outgoing calls and can also be used for
pulse dialing. When on-hook, negligible dc current flows
through the hookswitch. When off-hook, the hookswitch
transistor pair, Q1 and Q2, turn on. A termination
impedance is applied across TIP and RING and causes
dc loop current to flow.
Several events occur internally to the DAA when the OH
bit is set. There is a 250 µs latency for the off-hook
command to communicate to the line-side device. When
the line-side device goes off-hook, an off-hook counter
forces a delay before transmission or reception can
25
20
15
10
5
0
0
20
Figure 8. DC I/V Characteristics
40
Loop Current (mA)
Rev. 1.0
DCIV
60
occur. After this, an ADC calibration is performed for
256 ms. The ADC calibration can be disabled by setting
the ADCC bit (Register 17, bit 5). Refer to Section "4.20.
Calibration" on page 16 for more information on
automatic calibration. To calculate the total time
required to go off-hook and start transmission or
reception, the digital filter delay (typically 1.5 ms with
the FIR filter) should be included in the calculation.
4.7. DC Termination
The Si3068 dc I/V characteristics, shown in Figure 8,
support a transmit full scale level of –1 dBm at TIP and
RING.
requirements of many other countries.
This
80
meets
FCC
100
requirements
Si3068
120
and
the
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