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參數(shù)資料
| 型號： | MAX9507 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.8V DirectDrive Video Filter Amplifier with Load Detection and Dual SPST Analog Switches |
| 中文描述： | 1.8V、DirectDrive視頻濾波放大器，提供負(fù)載檢測和兩路SPST模擬開關(guān) |
| 文件頁數(shù)： | 14/29頁 |
| 文件大小： | 480K |
| 代理商： | MAX9507 |
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M
1.8V DirectDrive Video Filter Amplifier with
Load Detection and Dual SPST Analog Switches
14
______________________________________________________________________________________
Transparent Sync-Tip Clamp
The MAX9507 contains an integrated, transparent
sync-tip clamp. When using a DC-coupled input, the
sync-tip clamp does not affect the input signal, as long
as it remains above ground. When using an AC-cou-
pled input, the sync-tip clamp automatically clamps the
input signal to ground, preventing it from going lower. A
small current of 2μA pulls down on the input to prevent
an AC-coupled signal from drifting outside the input
range of the device.
Using an AC-coupled input results in some additional
variation of the black level at the output. Applying a
voltage above ground to the input pin of the device
always produces the same output voltage, regardless
of whether the input is DC- or AC-coupled. However,
since the sync-tip clamp level (V
CLP
) can vary over a
small range, the video black level at the output of the
device when using an AC-coupled input can vary by an
additional amount equal to the V
CLP
multiplied by the
DC voltage gain (A
V
).
Dual SPST Analog Switches
The MAX9507 has dual SPST analog switches for rout-
ing additional audio, video, digital, and other signals.
The switches are selected through the I
2
C interface.
SW1EN (register 0x00, bit B6) and SW2EN (register
0x00, bit B7) control the analog switches. See the I
2
C
Registers and Bit Descriptions section. The dual analog
switches operate in either normal or extended range. In
normal range, the part is in shutdown and the analog
switches can handle signals between GND and V
DD
. In
extended range, the charge pump and linear regulator
are on and the analog switches can handle signals
between -0.9V and V
DD
.
Short-Circuit Protection
The MAX9507 typical operating circuit includes a 75
Ω
back-termination resistor that limits short-circuit current
if an external short is applied to the video output. The
MAX9507 also features internal output short-circuit pro-
tection to prevent device damage in prototyping and
applications where the amplifier output can be directly
shorted.
Powering On/Off the MAX9507
The MAX9507 powers on in a low-power shutdown
mode with the analog switches open and the video sig-
nal path, charge pump, and load detection circuitry
disabled. It is good practice to configure the operating
mode of the signal path before enabling it. This may
include selecting the sync-tip clamp and video filter.
Setting CPEN = 1 (register 0x00, bit B0) enables the
charge pump. The charge pump must be fully opera-
tional before the signal path will be functional. Setting
SPEN = 1 (register 0x00, bit B1) enables the signal
path. Both SPEN and CPEN may be set at the same
time and internal control circuitry will monitor the
charge pump and enable the signal path at the appro-
priate time.
The analog switches can be turned on or off at any
time, regardless of the state of the charge pump or sig-
nal path. However, the signal range is limited from GND
to V
DD
when the charge pump is disabled.
The MAX9507 can be placed in a low-power shutdown
mode by setting SPEN = 0 and CPEN = 0.
Video Load Detection Circuitry
The MAX9507 contains video load detection circuitry at
the video output, enabling efficient power consumption
based on the actual presence of a video load. Setting
the automatic signal path enable bit, ASPEN = 1 (regis-
ter 0x01, bit B1) or the automatic charge-pump enable
bit, ACPEN = 1 (register 0x01, bit B0) enables the load
detection feature. The LOAD bit (register 0x01, bit B7)
indicates the load status.
To enable complete, automatic control of the part, set
ASPEN = ACPEN = 1 and SPEN = CPEN = 0. In this
state, when an output load is connected to the amplifi-
er, the signal path and charge pump fully turn on and
stay on until the output load is disconnected. If an out-
put load is not connected to the amplifier, then the sig-
nal path and charge pump remain in a low-power sleep
mode while continuing to check if a load is connected.
Setting SPEN = 1 or CPEN = 1 overrides the corre-
sponding ASPEN or ACPEN bits, enabling the block
regardless of the detected video load status.
The LOAD bit indicates the latest video load status. All
changes to the video load status are debounced typi-
cally 128ms to eliminate false load-detect events.
Setting the load change flag enable bit, LCFEN = 1 (reg-
ister 0x01, bit B3), and enabling the load detection fea-
ture (ASPEN = 1 or ACPEN = 1) enables the open-drain
LCF
output.
LCF
asserts low whenever the LOAD bit
changes state. It remains low until the LOAD bit (register
0x01) is read.
LCF
can be used as an interrupt to notify
the system that the load status has changed.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX9507ATE+ | 功能描述:視頻放大器 1.8V DirectDrive Video Filter Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX9507ATE+T | 功能描述:視頻放大器 1.8V DirectDrive Video Filter Amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX9507EVCMAXQU+ | 功能描述:放大器 IC 開發(fā)工具 MAX9507 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9507EVKIT | 功能描述:視頻放大器 RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| MAX9507EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX9507 Eval Kit RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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