SI3215-FT Silicon Laboratories Inc, SI3215-FT Datasheet - Page 39

• Manufacturer Part Number: SI3215-FT
• Description: IC SLIC/CODEC 1CH 38TSSOP
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3215-FT

• Function: Subscriber Line Interface Concept (SLIC), CODEC
• Interface: PCM, SPI
• Number Of Circuits: 1
• Voltage - Supply: 3.13 V ~ 5.25 V
• Current - Supply: 88mA
• Power (watts): 700mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: *
• Includes: Audio Tone Generation, BORSCHT Functions, FSK Generation, Voice Loopback Test Modes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.6. Audio Path
Unlike traditional SLICs, the codec function is integrated
into the ProSLIC. The 16-bit codec offers programmable
gain/attenuation blocks and several loop-back modes.
The signal path block diagram is shown in Figure 22.
2.6.1. Transmit Path
In the transmit path, the analog signal fed by the
external ac coupling capacitors is amplified by the
analog transmit amplifier, ATX, prior to the A/D
converter. The gain of the ATX is user-selectable to one
of mute/–3.5/0/3.5 dB options. The main role of ATX is
to coarsely adjust the signal swing to be as close as
possible to the full-scale input of the A/D converter in
order to maximize the signal-to-noise ratio of the
transmit path. After passing through an anti-aliasing
filter, the analog signal is processed by the A/D
converter, producing an 8 kHz, 16-bit wide, linear PCM
Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
Ringing Frequency
directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28 through
31).
Ring Trip Detect Status (monitor only)
Ring Trip Detect Debounce Interval
16.667
Hz
20
30
40
50
60
Ring Trip Interrupt Pending
Ring Trip Filter Coefficient
Ring Trip Interrupt Enable
Ring Trip Threshold
Parameter
Table 29. Associated Registers for Ring Trip Detection
Table 30. Recommended Ring Trip Values for Ringing
decimal
100
128
213
256
112
64
NRTP
0200
0320
0380
0400
06A8
0800
hex
Rev. 0.92
data stream. The standard requirements for transmit
path attenuation for signals above 3.4 kHz are
implemented as part of the combined decimation filter
characteristic of the A/D converter. One more digital
filter is available in the transmit path, THPF. THPF
implements the high-pass attenuation requirements for
signals below 65 Hz. The linear PCM data stream
output from THPF is amplified by the transmit-path
programmable gain amplifier, ADCG, which can be
programmed from –
transmit path signal processing is the user-selectable
A-law or µ-law compression, which can reduce the data
stream word width to 8 bits. Depending on the
PCM_Mode register selection, every 8-bit compressed
serial data word will occupy one time slot on the PCM
highway, or every 16-bit uncompressed serial data
word will occupy two time slots on the PCM highway.
decimal
34 mA
34 mA
34 mA
34 mA
34 mA
34 mA
NRTP[12:0]
RPTP[5:0]
RTDI[6:0]
Register
RTIP
RTIE
RTP
RPTP
3600
3600
3600
3600
3600
3600
hex
∞
dB to 6 dB. The final step in the
Indirect Register 16
Indirect Register 23
Direct Register 19
Direct Register 22
Direct Register 70
Direct Register 68
15.4 ms
12.3 ms
8.96 ms
decimal
7.5 ms
4.8 ms
5 ms
Location
RTDI
Si3215
hex
0B
0F
09
07
05
05
39