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參數(shù)資料
| 型號： | KSZ9021RNI |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 44/58頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC TXRX 10/100/1000 SGL 48QFN |
| 標(biāo)準(zhǔn)包裝： | 260 |
| 類型： | 收發(fā)器 |
| 驅(qū)動(dòng)器/接收器數(shù)： | 8/8 |
| 規(guī)程： | 千兆位以太網(wǎng) |
| 電源電壓： | 3.135 V ~ 3.465 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 48-VFQFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 48-QFN（7x7） |
| 包裝： | 托盤 |
| 配用： | 576-3874-ND - BOARD EVALUATION FOR KSZ9021RN |
| 其它名稱： | 576-3978 KSZ9021RNI-ND |
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2010 Microchip Technology Inc.
DS22265A-page 49
MCP444X/446X
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 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
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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參數(shù)描述 |
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| KSZ9031MNX | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:The KSZ9031MNX is a completely integrated triple-speed (10Base-T/100Base-TX/1000Base-T) Ethernet physicallayer transceiver for transmission and reception of data on standard CAT-5 unshielded twisted pair (UTP) cable. |
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| KSZ9031MNXCA TR | 功能描述:以太網(wǎng) IC 1-Port Gigabit Ethernet PHY RoHS:否 制造商:Micrel 產(chǎn)品:Ethernet Switches 收發(fā)器數(shù)量:2 數(shù)據(jù)速率:10 Mb/s, 100 Mb/s 電源電壓-最大:1.25 V, 3.45 V 電源電壓-最小:1.15 V, 3.15 V 最大工作溫度:+ 85 C 封裝 / 箱體:QFN-64 封裝:Tray |
| KSZ9031MNXCA-TR | 功能描述:4/4 Transceiver Full Ethernet 64-QFN (8x8) 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 類型:收發(fā)器 協(xié)議:以太網(wǎng) 驅(qū)動(dòng)器/接收器數(shù):4/4 雙工:全 接收器滯后:- 數(shù)據(jù)速率:- 電壓 - 電源:1.8V，2.5V，3.3V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:64-VFQFN 裸露焊盤 供應(yīng)商器件封裝:64-QFN（8x8） 標(biāo)準(zhǔn)包裝:1 |
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