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参数资料
| 型号： | MAX4545CAP |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | Fixed-Point Digital Signal Processor 179-BGA MICROSTAR |
| 中文描述： | QUAD 1-CHANNEL, AUDIO/VIDEO SWITCH, PDSO20 |
| 封装： | 0.200 INCH, 0.65 MM PITCH, SSOP-20 |
| 文件页数： | 9/16页 |
| 文件大小： | 166K |
| 代理商： | MAX4545CAP |
Typical attenuation in 50
systems is -1dB and is rea-
sonably flat up to 100MHz. Higher-impedance circuits
show even lower attenuation (and vice versa), but
slightly lower bandwidth due to the increased effect of
the internal and external capacitance and the switch’s
internal resistance.
The MAX4545/MAX4546/MAX4547 are optimized for
±5V operation. Using lower supply voltages or a single
supply increases switching time, increases on-resis-
tance (and therefore on-state attenuation), and increas-
es nonlinearity.
S witc h Off Condition
When the switch is off, MOSFETs N1, N2, P1, and P2
are off and MOSFET N3 is on. The signal path is
through the off-capacitances of the series MOSFETs,
but it is shunted to ground by N3. This forms a high-
pass filter whose exact characteristics are dependent
on the source and load impedances. In 50
systems,
and below 10MHz, the attenuation can exceed 80dB.
This value decreases with increasing frequency and
increasing circuit impedances. External capacitance
and board layout have a major role in determining over-
all performance.
__________Applic ations Information
Power-S upply Considerations
Overview
The MAX4545/MAX4546/MAX4547 construction is typi-
cal of most CMOS analog switches. It has three supply
pins: V+, V-, and GND. V+ and V- are used to drive the
internal CMOS switches and set the limits of the analog
voltage on any switch. Reverse ESD protection diodes
are internally connected between each analog signal
pin and both V+ and V-. If the voltage on any pin
exceeds V+ or V-, one of these diodes will conduct.
During normal operation these reverse-biased ESD
diodes leak, forming the only current drawn from V-.
Virtually all the analog leakage current is through the
ESD diodes. Although the ESD diodes on a given sig-
nal pin are identical, and therefore fairly well balanced,
they are reverse biased differently. Each is biased by
either V+ or V- and the analog signal. This means their
leakages vary as the signal varies. The difference in the
two diode leakages from the signal path to the V+ and
V- pins constitutes the analog signal-path leakage cur-
rent. All analog leakage current flows to the supply ter-
minals, not to the other switch terminal. This explains
how both sides of a given switch can show leakage
currents of either the same or opposite polarity.
There is no connection between the analog signal
paths and GND. The analog signal paths consist of an
N-channel and P-channel MOSFET with their sources
and drains paralleled and their gates driven out of
phase with V+ and V- by the logic-level translators.
V+ and GND power the internal logic and logic-level
translators, and set the input logic thresholds. The
logic-level translators convert the logic levels to
switched V+ and V- signals to drive the gates of the
analog switches. This drive signal is the only connec-
tion between the logic supplies and the analog sup-
plies. All pins have ESD protection to V+ and to V-.
Increasing V- has no effect on the logic-level thresh-
olds, but it does increase the drive to the P-channel
switches, reducing their on-resistance. V- also sets the
negative limit of the analog signal voltage.
The logic-level thresholds are CMOS and TTL compati-
ble when V+ is +5V. As V+ is raised, the threshold
increases slightly; when V+ reaches +12V, the level
threshold is about 3.1V, which is above the TTL output
high-level minimum of 2.8V, but still compatible with
CMOS outputs.
Bipolar-Supply Operation
The MAX4545/MAX4546/MAX4547 operate with bipolar
supplies between ±2.7V and ±6V. The V+ and V- sup-
plies need not be symmetrical, but their sum cannot
exceed the absolute maximum rating of 13.0V.
Do not
connect the MAX4545/MAX4546/MAX4547 V+ pin to
+3V and connect the logic-level input pins to TTL
logic-level signals. TTL logic-level outputs can
exceed the absolute maximum ratings, causing
damage to the part and/or external circuits.
CAUT ION:
The absolute maximum V+ to V- differential
voltage is 13.0V. Typical “±6-Volt” or “12-Volt”
supplies with ±10% tolerances can be as high
as 13.2V. This voltage can damage the
MAX4545/MAX4546/MAX4547. Even ±5% toler-
ance supplies may have overshoot or noise
spikes that exceed 13.0V.
Single-Supply Operation
The MAX4545/MAX4546/MAX4547 operate from a sin-
gle supply between +2.7V and +12V when V- is con-
nected to GND. All of the bipolar precautions must be
observed. Note, however, that these parts are opti-
mized for ±5V operation, and most AC and DC charac-
teristics are degraded significantly when departing
from ±5V. As the overall supply voltage (V+ to V-) is
lowered, switching speed, on-resistance, off isolation,
and distortion are degraded. (See Typical Operating
Characteristics.)
M
Quad/Dual, Low-Voltage,
Bidirec tional RF/Video S witc hes
_______________________________________________________________________________________
9
相关PDF资料 |
PDF描述 |
|---|---|
| MAX4545CPP | Fixed-Point Digital Signal Processor 144-LQFP |
| MAX4545CWP | Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches |
| MAX4545EPP | Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches |
| MAX4546 | Fixed-Point Digital Signal Processors 240-BGA MICROSTAR |
| MAX4547CEE | Quad/Dual, Low-Voltage, Bidirectional RF/Video Switches |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4545CAP+ | 功能描述:视频开关 IC Bidirectional RF Video Switch 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 |
| MAX4545CAP+T | 功能描述:视频开关 IC Bidirectional RF Video Switch 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 |
| MAX4545CAP-T | 功能描述:RF 开关 IC RoHS:否 制造商:M/A-COM Technology Solutions 开关数量:Single 开关配置:SPDT 介入损耗:0.6 dB 截止隔离（典型值）:43 dB 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:PQFN-16 封装:Reel |
| MAX4545CPP | 功能描述:RF 开关 IC RoHS:否 制造商:M/A-COM Technology Solutions 开关数量:Single 开关配置:SPDT 介入损耗:0.6 dB 截止隔离（典型值）:43 dB 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:PQFN-16 封装:Reel |
| MAX4545CPP+ | 功能描述:RF 开关 IC RoHS:否 制造商:M/A-COM Technology Solutions 开关数量:Single 开关配置:SPDT 介入损耗:0.6 dB 截止隔离（典型值）:43 dB 最大工作温度:+ 85 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:PQFN-16 封装:Reel |
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