- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄1892 > AD8105ABPZ (Analog Devices Inc)IC CROSSPOINT SWIT 32X16 304BGA PDF資料下載
參數(shù)資料
| 型號： | AD8105ABPZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 20/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CROSSPOINT SWIT 32X16 304BGA |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 功能： | 交叉點(diǎn)開關(guān) |
| 電路： | 1 x 32:16 |
| 電壓電源： | 單/雙電源 |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 5.5 V，±2.5V |
| 電流 - 電源： | 340mA |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 304-BGA 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 304-BGA（31x31） |
| 包裝： | 托盤 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁當(dāng)前第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁
AD8104/AD8105
Rev. 0 | Page 27 of 36
however, until the UPDATE signal is taken low. It is thus possible
to latch in new data for several or all of the outputs first via
successive negative transitions of WE while UPDATE is held
high, and then have all the new data take effect when UPDATE
goes low. This technique should be used when programming
the device for the first time after power-up when using parallel
programming.
Reset
When powering up the AD8104/AD8105, it is usually desirable
to have the outputs come up in the disabled state. The RESET
pin, when taken low, causes all outputs to be in the disabled state.
However, the UPDATE signal does not reset all registers in the
AD8104/AD8105. This is important when operating in the
parallel programming mode. Refer to the Parallel Programming
Description section for information about programming internal
registers after power-up. Serial programming programs the entire
matrix each time; therefore, no special considerations apply.
Since the data in the shift register is random after power-up, it
should not be used to program the matrix, or the matrix can
enter unknown states. To prevent this, do not apply a logic low
signal to UPDATE initially after power-up. The shift register
should first be loaded with the desired data, and then UPDATE
can be taken low to program the device.
The RESET pin has a 20 kΩ pull-up resistor to VDD that can be
used to create a simple power-up reset circuit. A capacitor from
RESET to ground holds RESET low for some time while the rest
of the device stabilizes. The low condition causes all the outputs
to be disabled. The capacitor then charges through the pull-up
resistor to the high state, thus allowing full programming
capability of the device.
Because the AD8104/AD8105 have random data in the internal
registers at power-up, the device may power up in a test state
where the supply current is larger than typical. Therefore, the
RESET pin should be used to disable all outputs and bring the
device out of any test mode.
OPERATING MODES
The AD8104/AD8105 has fully differential inputs and outputs.
The inputs and outputs can also be operated in a single-ended
fashion. This presents several options for circuit configurations
that require different gains and treatment of terminations, if
they are used.
Differential Input
Each differential input to the AD8104/AD8105 is applied to a
differential receiver. These receivers allow the user to drive the
inputs with a differential signal with an uncertain common-
mode voltage, such as from a remote source over twisted pair.
The receivers respond only to the difference in input voltages,
and will restore a common-mode voltage suitable for the
internal signal path. Noise or crosstalk that is present in both
inputs is rejected by the input stage, as specified by its common-
mode rejection ratio (CMRR). Differential operation offers a
great noise benefit for signals that are propagated over distance
in a noisy environment.
IN+
VOCM
IN–
RG
RCVR
RF
OUT–
OUT+
TO SWITCH MATRIX
06
61
2-
06
5
Figure 65. Input Receiver Equivalent Circuit
The circuit configuration used by the differential input receivers
is similar to that of several Analog Devices, Inc. general-purpose
differential amplifiers, such as the AD8131. It is a voltage
feedback amplifier with internal gain setting resistors. The
arrangement of feedback makes the differential input imped-
ance appear to be 5 kΩ across the inputs.
kΩ
5
2
,
=
×
=
G
dm
IN
R
This impedance creates a small differential termination error if
the user does not account for the 5 kΩ parallel element, although
this error is less than 1% in most cases. Additionally, the source
impedance driving the AD8104/AD8105 appears in parallel
with the internal gain-setting resistors, such that there may be a
gain error for some values of source resistance. The AD8104/
AD8105 are adjusted such that its gains are correct when driven
by a back-terminated 75 Ω source impedance at each input
phase (37.5 Ω effective impedance to ground at each input pin,
or 75 Ω differential source impedance across pairs of input
pins). If a different source impedance is presented, the differential
gain of the AD8104/AD8105 can be calculated by
S
G
F
dm
IN
OUT,dm
dm
R
V
G
+
=
,
where:
RG = 2.5 kΩ.
RS is the user single-ended source resistance (such as 37.5 Ω for
a back-terminated 75 Ω source).
RF = 2.538 kΩ for the AD8104 and 5.075 kΩ for the AD8105.
In the case of the AD8104,
S
dm
R
G
+
=
kΩ
5
.
2
kΩ
538
.
2
In the case of the AD8105,
S
dm
R
G
+
=
kΩ
5
.
2
kΩ
075
.
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD8107ASTZ | IC CROSSPOINT SWITCH 16X5 80LQFP |
| AD8108ASTZ | IC VIDEO CROSSPOINT SWIT 80LQFP |
| AD8110ASTZ | IC VIDEO CROSSPOINT SWIT 80LQFP |
| AD8112JSTZ | IC CROSSPOINT SWIT 16X8 100LQFP |
| AD8113JSTZ | IC VIDEO CROSSPOINT SWIT 100LQFP |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8106 | 制造商:AD 制造商全稱:Analog Devices 功能描述:260 MHz, 16 】 5 Buffered Video Crosspoint Switches |
| AD8106ASTZ | 功能描述:IC CROSSPOINT SWITCH 16X5 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導(dǎo)通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
| AD8106-EB | 制造商:AD 制造商全稱:Analog Devices 功能描述:260 MHz, 16 】 5 Buffered Video Crosspoint Switches |
| AD8107 | 制造商:AD 制造商全稱:Analog Devices 功能描述:260 MHz, 16 】 5 Buffered Video Crosspoint Switches |
| AD8107ASTZ | 功能描述:IC CROSSPOINT SWITCH 16X5 80LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 其它有關(guān)文件:STG4159 View All Specifications 標(biāo)準(zhǔn)包裝:5,000 系列:- 功能:開關(guān) 電路:1 x SPDT 導(dǎo)通狀態(tài)電阻:300 毫歐 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±1.65 V ~ 4.8 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:7-WFBGA，F(xiàn)CBGA 供應(yīng)商設(shè)備封裝:7-覆晶 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。