參數(shù)資料
型號: ADV3201ASWZ
廠商: Analog Devices Inc
文件頁數(shù): 21/36頁
文件大小: 0K
描述: IC CROSSPOINT SWIT 32X32 176LQFP
標(biāo)準(zhǔn)包裝: 1
功能: 交叉點(diǎn)開關(guān)
電路: 1 x 32:32
電壓電源: 單/雙電源
電壓 - 電源,單路/雙路(±): 5V,±2.5V,±3.3V
電流 - 電源: 260mA
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 176-LQFP 裸露焊盤
供應(yīng)商設(shè)備封裝: 176-LQFP-EP(24x24)
包裝: 托盤
ADV3200/ADV3201
Rev. 0 | Page 28 of
36
In addition to a receiver, each input also has a sync-tip clamp
for use in ac-coupled applications. All clamps are enabled or
disabled according to the first serial data bit shifted in during
programming logic. When enabled, the clamp forces the lowest
input voltage to the voltage on the VCLAMP pin. The VCLAMP
pin is common to the entire chip and needs to be driven from a
low impedance source to avoid crosstalk.
07
176-
008
IN00
VPOS
VNEG
VCLAMP
5A
TO INPUT
RECEIVER
OFF-CHIP
CAPACITOR
Figure 98. Conceptual Diagram of Sync-Tip Clamp in an
AC-Coupled Application
The output stage of the ADV3200/ADV3201 is designed for low
differential gain and phase error when driving composite video
signals. It also provides slew current for fast pulse response
when driving component video signals.
The outputs of the ADV3200/ADV3201 can be disabled to
minimize on-chip power dissipation. When disabled, a series of
internal amplifiers drives internal nodes such that a wideband
high impedance is presented at the disabled output, even when
the output bus is under large signal swings. (In the ADV3201,
there is 4 kΩ of resistance terminated to the VREF voltage by
the reference buffer.) This high impedance allows multiple ICs
to be bussed together without additional buffering.
Care must be taken to reduce output capacitance, which results
in more overshoot and frequency domain peaking. In addition,
when the outputs are disabled and driven externally, the voltage
applied to them must not exceed the valid output swing range
for the ADV3200/ADV3201 in order to keep these internal
amplifiers in their linear range of operation. Applying excess
voltage to the disabled outputs can cause damage to the
ADV3200/ADV3201 and should be avoided (see the Absolute
Maximum Ratings section for guidelines).
The internal connection of the ADV3200/ADV3201 is con-
trolled by a serial logic interface. Serial loading into a first rank
of latches preprograms each output. A global update signal
(UPDATE) moves the programming data into the second rank
of latches, simultaneously updating all outputs. A serial output
pin (DATA OUT) allows devices to be daisy chained for single-
pin programming of multiple ICs. A reset pin is available to
avoid bus conflicts by disabling all outputs. This reset clears
both the first and second rank of latches.
The ADV3200 can operate on a single 5 V supply, powering
both the signal path (with the VPOS/VNEG supply pins) and
the control logic interface (with the DVCC/DGND supply
pins). However, in order to easily interface to ground referenced
video signals, split supply operation is possible with ±2.5 V.
(The ADV3201 is intended to operate on ±3.3 V.) In the case of
split supplies, a flexible logic interface allows the control logic
supplies (DVCC/DGND) to be run off 3.3 V/0 V to 5 V/0 V
while the core remains on split supplies.
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