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| 型号： | SI3225PPT0-EVB |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 42/112页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL W/SI3200 INTERFACE |
| 标准包装： | 1 |
| 系列： | ProSLIC® |
| 类型： | ADC + DAC，编码解码器，前端 |
| 适用于相关产品： | Si3225 |
| 所含物品： | 评估板和光盘 |
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Si3220/25 Si3200/02
Rev. 1.3
35
Not
Recommended
fo
r N
ew
D
esi
gn
s
Figure 16. Adaptive Linefeed V/I Behavior
When the Si3220/Si3225 is used with the Si3200/2
linefeed device, the source impedance of the dc feed is
640
before the adaptive linefeed transition and 320
after the adaptive linefeed transition, as shown in
Figure 16. On the other hand, when the Si3220/Si3225
is used with a discrete bipolar transistor linefeed, the
source impedance of the dc feed is 320
both before
and after the adaptive linefeed transition.
The loop closure thresholds are programmable via the
LCROFFHK and LCRONHK RAM addresses. The
LCRLPF
RAM
address
provides
filtering
of
the
measured loop current, and the LCRDBI RAM address
provides de-bouncing. The LCR status bit in register
LCRRTP indicates when a loop closure event has been
detected. See “3.10. Loop Closure Detection” on
page 45 for additional details.
3.4.2. On-Hook to Off-Hook Transition
Referring to Figure 16, point 1 represents the open-
circuit voltage (VOC = –48 V) of the dc feed. At point 1,
the source impedance of the dc feed is 640
(320 for
discrete
bipolar
transistor
linefeed)
and
VTIP/
RING = VOC, since no current flows in the loop. When
a dc load is connected across TIP and RING and as dc
current begins to flow in the dc loop, the product of the
dc loop current and the 640
source impedance
(320
for a discrete bipolar transistor linefeed) causes
the
VTIP/RING
voltage
to
decline
linearly
with
increasing loop current. When the VTIP/RING voltage
reaches the VOCLTH threshold (point 2), adaptive
linefeed switches the source impedance of the dc feed
to 320
and simultaneously boosts the value of VOC
by VOCDELTA (point 3). The source impedance of the
dc feed will now remain at 320
until the programmed
current limit (ILIM) is reached (point 4). At point 4, the dc
feed has entered into the constant current mode of
operation.
Adaptive linefeed can be disabled by writing a value of
zero into the VOCDELTA RAM address. Writing a value
of zero to VOCDELTA simply eliminates the apparent
VOC
voltage
boost
associated
with
a
non-zero
VOCDELTA value. With VOCDELTA = 0 in the case of
the Si3200/2, the adaptive linefeed transition still
changes the source impedance from 640
to 320 ,
and there is a corresponding discontinuity at the
0
10
20
30
40
50
60
70
0.005
0.01
0.015
0.02
0.025
Iloop (A)
Vt
ip/
ri
n
g
(
V
)
320 Ohms
VOCHTH
VOCLTH
VOCDELTA
1
6
2
3
5
4
10 kOhms
2450 Ohms
1930 Ohms
1800 Ohms
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相关代理商/技术参数 |
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|---|---|
| SI3225PPT-EVB | 制造商:SILABS 制造商全称:SILABS 功能描述:EVALUATION BOARD FOR THE Si3225 DUAL PROSLIC |
| SI3225PPTX-EVB | 功能描述:音频 IC 开发工具 Si3225 Eval Board RoHS:否 制造商:Texas Instruments 产品:Evaluation Kits 类型:Audio Amplifiers 工具用于评估:TAS5614L 工作电源电压:12 V to 38 V |
| SI3225-X-FQ | 制造商:SILABS 制造商全称:SILABS 功能描述:DUAL PROSLIC㈢ PROGRAMMABLE CMOS SLIC/CODEC |
| SI3225-X-GQ | 制造商:SILABS 制造商全称:SILABS 功能描述:DUAL PROSLIC㈢ PROGRAMMABLE CMOS SLIC/CODEC |
| SI3226 | 制造商:SILABS 制造商全称:SILABS 功能描述:Dual ProSLIC㈢ with DC-DC Controller |
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