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參數資料
| 型號： | MAX9516 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | 1.8V, Ultra-Low-Power, DirectDrive Video Filter Amplifier with Load Detect |
| 中文描述： | 1.8V、超低功耗、DirectDrive視頻濾波放大器，提供負載檢測 |
| 文件頁數： | 7/15頁 |
| 文件大小： | 320K |
| 代理商： | MAX9516 |
M
1.8V, Ultra-Low-Power, DirectDrive
Video Filter Amplifier with Load Detect
_______________________________________________________________________________________
7
Pin Description
PIN
1
2
3
4
5
6
7
8
9
10
NAME
V
SS
C1N
CPGND
C1P
V
DD
LOAD
GND
IN
SHDN
OUT
FUNCTION
Charge-Pump Negative Power Supply. Bypass with a 1μF capacitor to GND.
Charge-Pump Flying Capacitor Negative Terminal. Connect a 1μF capacitor from C1P to C1N.
Charge-Pump Ground
Charge-Pump Flying Capacitor Positive Terminal. Connect a 1μF capacitor from C1P to C1N.
Positive Power Supply. Bypass with a 0.1μF capacitor to GND.
Load-Detect Output. LOAD goes high when an output video load is detected.
Ground
Video Input
Active-Low Shutdown. Connect to V
DD
for normal operation.
Video Output
Detailed Description
The MAX9516 represents Maxim’s second-generation
of DirectDrive video amplifiers, which meet the require-
ments of current and future portable equipment:
1.8V operation. Engineers want to eliminate the 3.3V
supply in favor of lower supply voltages.
Lower power consumption. The MAX9516 reduces
average power consumption by up to 75% com-
pared to the 3.3V first-generation devices (MAX9503/
MAX9505).
Internal fixed gain of 8. As the supply voltages drop
for system chips on deep submicron processes, the
video DAC can no longer create a 1V
P-P
signal at its
output, and the gain of 2 found in the previous gen-
eration of video filter amps is not enough.
Active-detect mode reduces power consumption.
DirectDrive technology is necessary for a voltage-mode
amplifier to output a 2V
P-P
video signal from a 1.8V
supply. The integrated inverting charge pump creates
a negative supply that increases the output range and
gives the video amplifier enough headroom to drive a
2V
P-P
video signal with a 150
load.
DirectDrive
Background
Integrated video filter amplifier circuits operate from a
single supply. The positive power supply usually cre-
ates video output signals that are level-shifted above
ground to keep the signal within the linear range of the
output amplifier. For applications where the positive DC
level is not acceptable, a series capacitor can be
inserted in the output connection in an attempt to elimi-
nate the positive DC level shift. The series capacitor
cannot truly level-shift a video signal because the aver-
age level of the video varies with picture content. The
series capacitor biases the video output signal around
ground, but the actual level of the video signal can vary
significantly depending upon the RC time constant and
the picture content.
The series capacitor creates a highpass filter. Since the
lowest frequency in video is the frame rate, which can be
from 24Hz to 30Hz, the pole of the highpass filter should
ideally be an order of magnitude lower in frequency than
the frame rate. Therefore, the series capacitor must be
very large, typically from 220μF to 3000μF. For space-
constrained equipment, the series capacitor is unac-
ceptable. Changing from a single-series capacitor to a
SAG network that requires two smaller capacitors only
reduces space and cost slightly.
The series capacitor in the usual output connection
also prevents damage to the output amplifier if the con-
nector is shorted to a supply or to ground. While the
output connection of the MAX9516 does not have a
series capacitor, the MAX9516 will not be damaged if
the connector is shorted to a supply or to ground (see
the Short-Circuit Protection section).
Video Amplifier
If the full-scale video signal from a video DAC is
250mV, the black level of the video signal created by
the video DAC is approximately 75mV. The MAX9516
shifts the black level to near ground at the output so
that the active video is above ground and the sync is
below ground. The amplifier needs a negative supply
for its output stage to remain in its linear region when
driving sync below ground.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX9516ALB+ | 制造商:Maxim Integrated Products 功能描述:1.8V, ULTRA-LOW-POWER, DIRECTDRIVE VIDEO FILTER AMPLIFIER - Bulk |
| MAX9516ALB+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 |
| MAX9516EVKIT+ | 功能描述:放大器 IC 開發(fā)工具 MAX9516 Eval Kit RoHS:否 制造商:International Rectifier 產品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
| MAX9517ATC+ | 功能描述:視頻放大器 Standard-Definition Video Filter Amp RoHS:否 制造商:ON Semiconductor 通道數量: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 |
| MAX9517ATC+T | 功能描述:視頻放大器 Standard-Definition Video Filter Amp RoHS:否 制造商:ON Semiconductor 通道數量: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 |
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