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| 型号： | ADV3229ACPZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC CROSSPOINT SW 16X8 72LFCSP |
| 标准包装： | 1 |
| 功能： | 交叉点开关 |
| 电路： | 1 x 8:8 |
| 电压电源： | 双电源 |
| 电压 - 电源，单路/双路(±)： | ±5V |
| 电流 - 电源： | 58mA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 72-VFQFN 裸露焊盘，CSP |
| 供应商设备封装： | 72-LFCSP-VQ（10x10） |
| 包装： | 托盘 |
ADV3228/ADV3229
Rev. 0 | Page 21 of 24
THEORY OF OPERATION
The ADV3228 (G = +1) and ADV3229 (G = +2) are crosspoint
arrays with eight outputs, each of which can be connected to
any one of eight inputs. Organized by output row, eight switchable
input transconductance stages are connected to each output buffer
to form 8-to-1 multiplexers. There are eight of these multiplexers,
each with its inputs wired in parallel, for a total array of 64 trans-
conductance stages forming a multicast-capable crosspoint
switch. Each input is buffered and is not loaded by the outputs,
simplifying the construction of larger arrays using the ADV3228
or ADV3229 as a building block.
Decoding logic for each output selects one (or none) of the
transconductance stages to drive the output stage. The enabled
transconductance stage drives the output stage, and feedback
forms a closed-loop amplifier. A mask programmable feedback
network sets the closed-loop signal gain. For the ADV3228, this
gain is +1, and for the ADV3229, this gain is +2.
The output stage of the ADV3228 or ADV3229 is designed for
low differential gain and phase error when driving composite
video signals. It also provides slew current for a fast pulse response
when driving component video signals. Unlike many multiplexer
designs, these requirements are balanced such that large signal
bandwidth is very similar to small signal bandwidth. The design
load is 150 Ω, but provisions are made to drive loads as low as
100 Ω when on-chip power dissipation limits are not exceeded.
The outputs of the ADV3228/ADV3229 can be disabled to minimize
on-chip power dissipation. When disabled, there is no feedback
network loading the output. This high disabled output impedance
allows multiple ICs to be bussed together without additional
buffering. Take care to reduce output capacitance, which results
in more overshoot and frequency domain peaking.
A series of internal amplifiers drives internal nodes such that a
wideband high impedance is presented at the disabled output,
even while the output bus is under large signal swings. To keep
these internal amplifiers in their linear range of operation when
the outputs are disabled and driven externally, do not allow the
voltage applied to them to exceed the valid output swing range
for the ADV3228/ADV3229. If the disabled outputs are left
floating, they may exhibit high enable glitches. If necessary,
the disabled output can be kept from drifting out of range by
applying an output load resistor to ground.
The connection of the ADV3228/ADV3229 is controlled by a
flexible TTL-compatible logic interface. Either parallel or serial
loading into a first rank of latches preprograms each output. A
global update signal moves the programming data into the second
rank of latches, simultaneously updating all outputs. In serial
mode, a serial output pin allows devices to be daisy-chained
together for single pin programming of multiple ICs. A power-
on reset pin is available to avoid bus conflicts by disabling all
outputs. This power-on reset clears the second rank of latches
but does not clear the first rank of latches. In serial mode, pre-
programming individual inputs is not possible, and the entire
shift register must be flushed.
To easily interface to ground-referenced video signals, the
ADV3228/ADV3229 operate on split ±5 V supplies. The logic
inputs and output run on a single 5 V supply, and the logic
inputs switch at approximately 1.6 V for compatibility with a
variety of logic families. The serial output buffer is a rail-to-rail
output stage with 5 mA of drive capability.
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