SI3225-G-GQ Silicon Laboratories Inc, SI3225-G-GQ Datasheet - Page 98

• Manufacturer Part Number: SI3225-G-GQ
• Description: IC PROSLIC/CODEC DUAL 64TQFP
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3225-G-GQ

• Function: Subscriber Line Interface Concept (SLIC), CODEC
• Interface: GCI, PCM, SPI
• Number Of Circuits: 2
• Voltage - Supply: 3.3V, 5V
• Current - Supply: 65mA
• Power (watts): 941mW
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-TQFP, 64-VQFP
• Includes: Battery Switching, BORSCHT Functions, DTMF Generation and Decoding, FSK Tone Generation, Modem and Fax Tone Detection
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Si3220/25 Si3200/02
3.32.4. Measurement Tools
98
8-Bit monitor A/D converter. This 8-bit A/D
converter monitors all dc and low-frequency voltage
and current data from TIP to ground and RING to
ground. Two additional values, TIP – RING and
TIP + RING, are calculated and stored in on-chip
registers to analyze metallic and longitudinal effects.
The A/D operates at an 800 Hz update rate to allow
measurement bandwidth from dc to 400 Hz. A dual-
range capability allows high-voltage/high-current
measurement in the high range but can also
measure lower voltages and currents with a tighter
resolution.
Programmable bandpass filter. A bandpass filter
discriminates certain frequency ranges, such as
ringing frequencies and 50 Hz/60 Hz induction, from
nearby or crossed power leads.
SLIC diagnostics filter. Several post-processing
filter blocks monitor peak dc and ac characteristics of
the Monitor A/D converter outputs and values
derived from these outputs. Setting the SDIAG bit in
the DIAG register enables the filters. There are
separate filters for each channel, and their control is
independent. These filters require DSP processing,
which is available only when voice band processing
is not being performed. If an off-hook or ring trip
condition is detected while the SDIAG bit is set, the
bit is cleared, and the diagnostic information is not
processed.
The following parameters can be selected as inputs
to the diagnostic block by setting the SDIAG bits in
the DIAG register to values 0–7 corresponding to the
order below:
V
V
V
TIP
RI NG
LOOP
VTIP
VRING
VLOOP
VLONG
ILOOP
ILONG
VRING,EXT
IRING,EXT
= voltage on the TIP lead
= voltage on the RING lead
= V
TIP
-V
RING
= metallic (loop) voltage
Figure 64. SLIC Diagnostic Filter Structure
Rev. 1.3
FULL WAVE
DIAGDCCO
RECTIFY
DETECT
PEAK
The SLIC diagnostic capability consists of a peak detect
block and two filter blocks, one for dc and one for ac.
The topology is illustrated in Figure 64.
The peak detect filter block reports the magnitude of the
largest positive or negative value without sign. The dc
filter block consists of a single pole IIR low-pass filter
with a coefficient held in the DIAGDCCO RAM location.
The filter output is read from the DIAGDC RAM location.
The ac filter block consists of a full-wave rectifier
followed by a single-pole IIR low-pass filter with a
coefficient held in the DIAGACCO RAM location. The
peak value is read from the DIAGPK RAM location. The
peak value is cleared and the filters are flushed on the
0-1 transition of the SDIAG bit and when the input
source changes. The user can write 0 to the DIAGPK
RAM location to get peak information for a specific time
interval.
LPF
16-bit audio A/D converter. The A/D converter
portion of the audio codec is made available for
processing test data received back through the
transmit audio path. The audio path offers a 2.5 V
peak voltage measurement capability and a coarse
attenuation stage for scenarios where the incoming
signal amplitude must be attenuated by as much as
3 dB to bring it into the allowable input range without
clipping.
V
I
I
V
ringing source (Si3225 only)
I
ringing source (Si3225 only)
LOOP
LONG
RING,EXT
LONG
RING, EXT
= I
= (I
= (V
TIP
= ringing current when using an external
TIP
= ringing voltage when using an external
TIP
-I
DIAGACCO
+I
RING
+V
RING
LPF
RING
= metallic (loop) current
)/2 = longitudinal current
)/2 = longitudinal voltage
DIAGDC
DIAGAC
DIAGPK