参数资料
型号: ADN4605ABPZ
厂商: Analog Devices Inc
文件页数: 25/56页
文件大小: 0K
描述: IC CROSSPOINT SWITCH 352BGA
标准包装: 1
系列: XStream™
功能: 交叉点开关
电路: 1 x 40:40
电压电源: 单电源
电压 - 电源,单路/双路(±): 2.25 V ~ 3.6 V
电流 - 电源: 55mA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 352-LBGA 裸露焊盘
供应商设备封装: 352-BGA-EP(35x35)
包装: 托盘
Data Sheet
ADN4605
Rev. A | Page 31 of 56
The amount of high frequency boost provided by the transmit-
ter is determined by both the output and preemphasis level
settings.
Table 14 provides an example of how the absolute output and
preemphasis level settings determine the amount of high
frequency boost at the Tx output. Note that the OLEV setting
refers to the main tap output current and the PE setting refers to
the delayed tap current.
The preemphasis boost equation follows:
+
×
=
V
DC
SW
DC
SW
PE
SW
Gain
1
log
20
]
dB
[
10
(1)
VTTO
VH-PE
VSW-PE
VL-PE
VL-DC
VSW-DC
VH-DC
VOCM
TPE
09796-
0
1
Figure 44. Signal Level Definitions
Table 14. Preemphasis Boost and Overshoot vs. Setting Example
PE Setting
Delayed Tap
Current (mA)
OLEV Setting
Main Tap
Current (mA)
Gain (dB)
Overshoot (%)
DC Swing
(mV p-p Diff)
0
4
16
0.00
800
3
4
5
20
3.52
50.00
800
7
8
6
24
6.02
100.00
800
7
8
4
16
9.54
200.00
400
7
8
3
12
13.98
400.00
200
Table 15. Symbol Definitions
Symbol
Formula
Definition
IDC
Programmable
Output current for main tap output level (OLEV)
IPE
Programmable
Output current for PE delayed tap (PE)
ITTO
IDC + IPE
Total transmitter output current
VDPP-DC
25 × IDC × 2
Peak-to-peak differential voltage swing of nonpreemphasized waveform
VDPP-PE
25 × ITTO × 2
Peak-to-peak differential voltage swing of preemphasized waveform
VSW-DC
VDPP-DC/2 = VH-DC – VL-DC
DC single-ended voltage swing
VSW-PE
VDPP-PE/2 = VH-PE – VL-PE
Preemphasized single-ended voltage swing
VOCM_DC-COUPLED
25 × ITTO/2
Output common-mode shift, dc-coupled outputs
VOCM_AC-COUPLED
50 × ITTO/2
Output common-mode shift, ac-coupled outputs
VOCM
VTTO VOCM = (VH-DC + VL-DC)/2
Output common-mode voltage
VH-DC
VTTO VOCM + VDPP-DC/2
DC single-ended output high voltage
VL-DC
VTTO VOCM VDPP-DC/2
DC single-ended output low voltage
VH-PE
VTTO VOCM + VDPP-PE/2
Maximum single-ended output voltage
VL-PE
VTTO VOCM VDPP-PE/2
Minimum single-ended output voltage
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