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参数资料
| 型号： | MAX9542AEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP VIDEO MUX 2:1 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 2:1 多路复用器-放大器 |
| 电路数： | 4 |
| -3db带宽： | 27MHz |
| 转换速率： | 65 V/µs |
| 电流 - 电源： | 21mA |
| 电流 - 输出 / 通道： | 140mA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 3.6 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (TR) |
MAX9541/MAX9542
Operating Modes
A/B controls whether Video Input A or Video Input B is
selected. See Table 1.
SHDN controls whether the device is on or off. See
Table 2. In shutdown, the outputs are in high imped-
ance.
Input
Each video source can provide up to four video signals.
Every video signal must be AC-coupled to the
MAX9541/MAX9542 through 0.1F capacitors. The
MAX9541/MAX9542 have sync-tip clamps and bias cir-
cuits to restore the DC level of the video signal after the
input coupling capacitor. When a video input is select-
ed, the input has a sync-tip clamp, which accepts
video signals that have sync pulses or that reach their
minimum level during sync. Composite video with
blanking and sync (CVBS) is an example of a video sig-
nal with sync pulses. The red, green, and blue signals
in an RGBS signal set are examples of signals that
return to their blank level during sync. The sync-tip volt-
age is internally set to 300mV.
When a video input is not selected, the inputs to the
MAX9541/MAX9542 do not distort the video signal in
case the video source is driving video signals to anoth-
er video circuit such as a video multiplexer. The inputs
are biased at VDD/3, which is sufficiently above ground
so that the ESD diodes never forward bias as the video
signal changes. The input resistance is 220k
Ω, which
presents negligible loading on the video current DAC.
The sole exception to this condition is IN3A, in which
the input circuit is always a sync-tip clamp. Table 3
summarizes which input circuit is active, dependent
upon A/B.
In shutdown mode (SHDN = LOW), a bias circuit is
active on every input.
Multiplexer
The MAX9541/MAX9542 have quadruple 2:1 multiplex-
ers to select between either Video Input A or Video
Input B as the source of the video signal. When A/B is
connected to GND, Video Input A is the video source.
When A/B is connected to VDD, Video Input B is the
video source.
Video Filter
The MAX9541 filter features ±1dB passband out to
9.5MHz and 47dB attenuation at 27MHz, making the fil-
ter suitable for standard-definition video signals from all
sources (e.g., broadcast and DVD). Broadcast video
signals are channel limited: NTSC signals have 4.2MHz
bandwidth, and PAL signals have 5MHz bandwidth.
Video signals from a DVD player, however, are not
channel limited; so the bandwidth of DVD video signals
can approach the Nyquist limit of 6.75MHz.
Recommendation: ITU-R BT.601-5 specifies 13.5MHz
as the sampling rate for standard-definition video.
Therefore, the maximum bandwidth of the signal is
6.75MHz. To ease the filtering requirements, most mod-
ern video systems oversample by two times, clocking
the video current DAC at 27MHz.
The MAX9542 does not have a filter.
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
12
______________________________________________________________________________________
LOGIC STATE
MODE
Low
Video Input A
High
Video Input B
Table 1.
A/B Logic
LOGIC STATE
MODE
Low
Off
High
On
Table 2.
SHDN Logic
INPUT
INPUT CIRCUIT
A/B = LOW
INPUT CIRCUIT
A/B = HIGH
IN0A
Sync-tip clamp
Bias
IN1A
Sync-tip clamp
Bias
IN2A
Sync-tip clamp
Bias
IN3A
Sync-tip clamp
IN0B
Bias
Sync-tip clamp
IN1B
Bias
Sync-tip clamp
IN2B
Bias
Sync-tip clamp
IN3B
Bias
Sync-tip clamp
Table 3. Input Circuit of Input as Determined by State of
A/B (SHDN = HIGH)
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