参数资料
型号: KSZ9021GN
厂商: Micrel Inc
文件页数: 33/53页
文件大小: 0K
描述: TXRX ETHERNET GB GMII/MII 64-MLF
标准包装: 348
类型: 收发器
驱动器/接收器数: 8/8
规程: 千兆位以太网
电源电压: 3.135 V ~ 3.465 V
安装类型: 表面贴装
封装/外壳: 64-VFQFN 裸露焊盘
供应商设备封装: 64-QFN(8x8)
包装: 托盘
配用: 576-3873-ND - BOARD EVALUATION FOR KSZ9021GN
其它名称: 576-3635
KSZ9021GN-ND
2009 Microchip Technology Inc.
DS22233A-page 39
MCP434X/436X
5.0
RESISTOR NETWORK
The Resistor Network has either 7-bit or 8-bit
resolution. Each Resistor Network allows zero scale to
full scale connections. Figure 5-1 shows a block
diagram for the resistive network of a device.
The Resistor Network is made up of several parts.
These include:
Resistor Ladder
Wiper
Shutdown (Terminal Connections)
Devices have either four resistor networks. These are
referred to as Pot 0, Pot 1 Pot 2, and Pot 3.
FIGURE 5-1:
Resistor Block Diagram.
5.1
Resistor Ladder Module
The resistor ladder is a series of equal value resistors
(RS) with a connection point (tap) between the two
resistors. The total number of resistors in the series
(ladder)
determines
the
RAB
resistance
(see
Figure 5-1). The end points of the resistor ladder are
connected to analog switches which are connected to
the device Terminal A and Terminal B pins. The RAB
(and RS) resistance has small variations over voltage
and temperature.
For an 8-bit device, there are 256 resistors in a string
between terminal A and terminal B. The wiper can be
set to tap onto any of these 256 resistors thus providing
257 possible settings (including terminal A and terminal
B).
For a 7-bit device, there are 128 resistors in a string
between terminal A and terminal B. The wiper can be
set to tap onto any of these 128 resistors thus providing
129 possible settings (including terminal A and terminal
B).
Equation 5-1 shows the calculation for the step
resistance.
EQUATION 5-1:
RS CALCULATION
RS
A
RS
B
257
256
255
1
0
RW
(1)
W
(01h)
Analog Mux
RW
(1)
(00h)
RW
(1)
(FEh)
RW
(1)
(FFh)
RW
(1) (100h)
Note 1:
The wiper resistance is dependent on
several factors including, wiper code,
device VDD, Terminal voltages (on A, B,
and W), and temperature.
Also for the same conditions, each tap
selection resistance has a small variation.
This RW variation has greater effects on
some specifications (such as INL) for the
smaller
resistance
devices
(5.0 k
Ω)
compared to larger resistance devices
(100.0 k
Ω).
RAB
8-Bit
N =
128
127
126
1
0
(01h)
(00h)
(7Eh)
(7Fh)
(80h)
7-Bit
N =
R
S
R
AB
256
()
-------------
=
R
S
R
AB
128
()
--------------
=
8-bit Device
7-bit Device
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KSZ9021GN TR 功能描述:以太网 IC Gigabit Ethernet Transceiver with GMII/MII RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray
KSZ9021GN-EVAL 功能描述:以太网开发工具 Gigabit Ethernet Transceiver with GMII/MII - Evaluation Board RoHS:否 制造商:Micrel 产品:Evaluation Boards 类型:Ethernet Transceivers 工具用于评估:KSZ8873RLL 接口类型:RMII 工作电源电压:
KSZ9021GNI 功能描述:以太网 IC Gigabit Ethernet Transceiver with GMII/MII, I-Temp RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray
KSZ9021GQ 功能描述:以太网 IC Gigabit Ethernet Transceiver with GMII/MII, Lead Free RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray
KSZ9021GQI 功能描述:以太网 IC Gigabit Ethernet Transceiver w/ GMII/MII, I-Temp RoHS:否 制造商:Micrel 产品:Ethernet Switches 收发器数量:2 数据速率:10 Mb/s, 100 Mb/s 电源电压-最大:1.25 V, 3.45 V 电源电压-最小:1.15 V, 3.15 V 最大工作温度:+ 85 C 封装 / 箱体:QFN-64 封装:Tray