参数资料
| 型号： | ISL5585GCR-TK |
| 厂商： | Intersil |
| 文件页数： | 3/24页 |
| 文件大小： | 0K |
| 描述： | IC SLIC RINGING 3.3V VOB 32-QFN |
| 标准包装： | 1,000 |
| 功能： | 用户线路接口概念（SLIC） |
| 电路数： | 1 |
| 电源电压： | 3.3V |
| 功率（瓦特）： | 305mW |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-VQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN（7x7） |
| 包装： | 带卷 (TR) |
| 包括： | 均衡和不均衡振铃，振铃声信号发生器，热关机，带警报指示器 |
11
The gain of the Transmit Amplifier, set by RS , determines
the programmed impedance of the device. The capacitor
CFB blocks the DC component of the loop current. The
ground symbols in the model represent AC grounds, not
actual DC potentials.
The Sense Amplifier is configured as a 4 input differential
amplifier with a gain of 3/4. The voltage at the output of the
sense amplifier (VSA) is calculated using superposition.
VSA1 is the voltage resulting from V1, VSA2 is the voltage
resulting from V2 and so on (reference Figure 4).
Where
V is equal to I
MRSENSE (RSENSE = 20)
The voltage at VTX is equal to:
VTR is defined in Figure 4, note polarity assigned to VTR:
Setting VIN equal to zero in EQ 18, defining ZO = -VTR/IM
and substituting it into EQ18 will enable the user to
determine the required feedback to match the line
impedance at V2W as shown in Equation 19.
2-Wire Impedance Matching
ZO is the source impedance of the device and is defined as.
ZL is the line impedance and RP is the external protection
resistor. RS is defined as:
V
SA1
3
4
--- V
1
()
–
=
(EQ. 11)
V
SA2
3
4
--- V
2
()
=
(EQ. 12)
V
SA3
3
4
--- V
3
()
–
=
(EQ. 13)
V
SA4
3
4
--- V
4
()
=
(EQ. 14)
V
SA
V
2
V
1
–
()
V
4
V
3
–
()
+
[]3
4
---
V
V
+
[]3
4
---
==
(EQ. 15)
V
SA
2I
M
20
×
()3
4
---
I
M30
==
(EQ. 16)
V
TX
V
IN
R
S
R
IN
----------
–
V
SA
–
R
S
8k
--------
V
IN
R
S
R
IN
----------
–
I
M 30
()
–
R
S
8k
--------
==
(EQ. 17)
V
TR
2V
TX
()
2V
IN
R
S
R
IN
----------
I
M30
()
R
S
8k
--------
+
==
(EQ. 18)
Z
O
1
133.33
------------------R
S
=
(EQ. 19)
Z
O
Z
L
2R
P
–
=
(EQ. 20)
R
S
133.33 Z
L
2R
P
–
()
=
(EQ. 21)
FIGURE 4. AC SIGNAL TRANSMISSION MODEL
AUX
TIP
RING
EG
VTR
IM
VTX
RP
+
-
+
-
+
IM
ZL
+
-
R
+
-
R
RSENSE
+
-
VSA = IM30
IX
+
-
IX
+
-
+
-
+
-
IM
+
-
20
20
V2W
+
-
INTERSIL
ISL5585
VTX
Z0
1:1
+
-
CFB
VFB
-IN
TA
R
RS
8k
3R
4R
IX
SENSE
FEEDBACK
RECEIVE BLOCK
V1
V2
V3
V4
IM +
-
IM
+
-
RSENSE
AMPLIFIER
FEED
AMPLIFIER
FEED
VIN
FROM CODEC
RIN
AMPLIFIER
ISL5585
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