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参数资料
型号： SI3216PPQX-EVB
厂商： Silicon Laboratories Inc
文件页数： 61/122页
文件大小： 0K
描述： BOARD EVAL W/DISCRETE INTERFACE
标准包装： 1
系列： ProSLIC®
主要目的： 接口，模拟前端（AFE）
已用 IC / 零件： Si3216
已供物品： 板，CD
Si3216
Rev. 1.0
43
Not
Recommended
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2.5. Audio Path
Unlike traditional SLICs, the codec function is integrated
into the ProSLIC. The 16-bit codec offers software-
selectable 200 Hz to 3.4 kHz narrowband and 50 Hz to
7 kHz
(Si3216
only)
wideband
audio
modes,
programmable gain/attenuation blocks, and several
loop-back modes. The signal path block diagram is
shown in Figure 24.
2.5.1. 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. ATX
has the following gain options: mute, –3.5, 0, and
3.5 dB. 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 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 a 16-bit wide, linear PCM data
stream. The standard requirements for transmit path
attenuation for signal frequencies above the audio band
are implemented as part of the combined decimation
filter characteristic of the A/D converter. An additional
filter, THPF, implements the high-pass attenuation
requirements for signals below 50 Hz. The linear PCM
data stream output from THPF is amplified by the
transmit-path programmable gain amplifier, ADCG,
which can be programmed from –
dB to 6 dB. The final
step in the transmit path signal processing is the user-
selectable A-law or -law compression block. In
narrowband mode, -law or A-law compression can be
selected to reduce the data stream word width to 8 bits.
Table 30. Associated Registers for Ring Trip Detection
Parameter
Register
Location
Ring Trip Interrupt Pending
RTIP
Direct Register 19
Ring Trip Interrupt Enable
RTIE
Direct Register 22
Ring Trip Detect Debounce Interval
RTDI[6:0]
Direct Register 70
Ring Trip Threshold
RPTP[5:0]
Indirect Register 16
Ring Trip Filter Coefficient
NRTP[12:0]
Indirect Register 23
Ring Trip Detect Status (monitor only)
RTP
Direct Register 68
Note: The ProSLIC uses registers that are both directly and indirectly mapped. A “direct” register is one that is mapped
directly. An “indirect” register is one that is accessed using the indirect access registers (direct registers 28 through
31).
Table 31. Recommended Ring Trip Values for Ringing
Ringing
Frequency
NRTP
RPTP
RTDI
Hz
decimal
hex
decimal
hex
decimal
hex
16.667
64
0200
34 mA
3600
15.4 ms
0F
20
100
0320
34 mA
3600
12.3 ms
0B
30
112
0380
34 mA
3600
8.96 ms
09
40
128
0400
34 mA
3600
7.5 ms
07
50
213
06A8
34 mA
3600
5 ms
05
60
256
0800
34 mA
3600
4.8 ms
05
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