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| 型号： | MAX4885ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/13页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH 2X1 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 功能： | 开关 |
| 电路： | 1 x 2:1 |
| 导通状态电阻： | 10 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 4.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 管件 |
MAX4885
Complete VGA 1:2 or 2:1 Multiplexer
_______________________________________________________________________________________
9
Detailed Description
The MAX4885 integrates high-bandwidth analog
switches and level-translating buffers to implement a
complete 1:2 or 2:1 multiplexer for VGA signals. The
device provides switching for RGB, HSYNC, VSYNC,
and DDC signals. A low-noise charge pump with inter-
nal capacitors provides a boosted gate-drive voltage to
improve performance of the RGB switches.
The device provides two modes of operation: 1:2 and
2:1. In 1:2 mode (M = 0), the HSYNC and VSYNC
inputs feature level-shifting buffers to support TTL out-
put logic levels from low-voltage graphics controllers.
These buffered switches may be driven from as little as
+2.0V up to +5.5V. In 2:1 mode (M=1), the output
buffers for the HSYNC and VSYNC signals are dis-
abled. In both modes, RGB signals are routed with the
same high-performance analog switches, and DDC sig-
nals are voltage clamped to a diode drop less than
VCL. Voltage clamping provides protection and com-
patibility with DDC signals and low-voltage ASICs. In
keyboard/video/mouse (KVM) applications, VCL is nor-
mally set to +5V because low-voltage clamping is not
required, as specified by the VESA standard.
Drive EN logic high to shut down the MAX4885. In shut-
down mode, supply current is reduced to 5A and all
switches are high impedance, providing high-signal
rejection. The RGB, HSYNC, VSYNC, and DDC switches
are ESD protected to ±8kV by the Human Body Model.
RGB Switches
The MAX4885 provides three SPDT high-bandwidth
switches to route standard VGA R, G, and B signals
(see Table 1). A boosted gate-drive voltage is generat-
ed by an internal charge pump to improve performance
of the RGB switches. The R, G, and B analog switches
are identical, and any of the three switches can be
used to route red, green, or blue video signals. The
RGB switches function with reduced performance with
the charge pump disabled.
Charge Pump
A low-noise charge pump with internal capacitors pro-
vides a doubled voltage for driving the RGB analog
switches. Noise voltage from the charge pump is less
than 50VP-P. The noise level is more than 80dB below
the signal level, making the charge pump suitable for
Pin Description (continued)
PIN
NAME
FUNCTION
18
H2
Horizontal Sync I/O
19
V2
Vertical Sync I/O
22
V1
Vertical Sync I/O
23
H1
Horizontal Sync I/O
24
B1
RGB Analog I/O
25
G1
RGB Analog I/O
26
R1
RGB Analog I/O
27
DDCB1
DDC I/O
28
DDCA1
DDC I/O
31
M
Mode Select. Drive M low for 1:2 multiplexer mode. Drive M high for 2:1 multiplexer mode. See Tables
1, 2, and 3.
32
SEL
Select. Logic input for switching RGB, HV, and DDC switches. See Tables 1, 2, and 3.
EP
Exposed Pad. Connect exposed pad to ground.
EN
SEL
FUNCTION
00
R0 to R1
G0 to G1
B0 to B1
01
R0 to R2
G0 to G2
B0 to B2
1
X
R_, B_, and G_, High Impedance
Table 1. RGB Truth Table
X = Don’t Care
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4885ETJ+ | 功能描述:多路器开关 IC Complete VGA 1:2 or 2:1 MUX RoHS:否 制造商:Texas Instruments 通道数量:1 开关数量:4 开启电阻（最大值）:7 Ohms 开启时间（最大值）: 关闭时间（最大值）: 传播延迟时间:0.25 ns 工作电源电压:2.3 V to 3.6 V 工作电源电流: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UQFN-16 |
| MAX4885ETJ+T | 功能描述:视频开关 IC Complete VGA 1:2 or 2:1 MUX RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| MAX4885ETJ-T | 功能描述:视频开关 IC RoHS:否 制造商:Texas Instruments 开关数量:4 开启电阻（最大值）:12 Ohms 传播延迟时间: 开启时间（最大值）: 关闭时间（最大值）: 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:WQFN-42 封装:Reel |
| MAX4885EVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX4885 EVAL KIT - Boxed Product (Development Kits) |
| MAX4886ETJ | 功能描述:模拟开关 IC RoHS:否 制造商:Texas Instruments 开关数量:2 开关配置:SPDT 开启电阻（最大值）:0.1 Ohms 切换电压（最大）: 开启时间（最大值）: 关闭时间（最大值）: 工作电源电压:2.7 V to 4.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:DSBGA-16 |
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