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參數(shù)資料
| 型號： | PS4532EWP |
| 廠商： | PERICOM SEMICONDUCTOR CORP |
| 元件分類： | 多路復用及模擬開關 |
| 英文描述： | TRIPLE 2-CHANNEL, SGL ENDED MULTIPLEXER, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁數(shù)： | 16/16頁 |
| 文件大?。?/td> | 263K |
| 代理商： | PS4532EWP |
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PS8591D
11/17/04
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PS4530/PS4531/PS4532
Precision 8-Ch, 2-Ch, Latched Analog Multiplexers/Switches
Applications Information
Power-Supply Considerations
Overview
The PS4530/PS4531/PS4532 construction is typical of most CMOS
analog Switches. They have three supply pins: V+, V, and GND. V+
and V- drive the 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-. One of these diodes conducts if any signal exceeds V+
or V-. During normal operation, these and other reverse-biased
ESD diodes leak, forming the only current drawn from V+ or V–.
Virtually all of the analog leakage current comes from the ESD
diodes. Although the ESD diodes on a given signal pine are iden-
tical 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 to the V+ and V– pins constitutes the
analog-signal-path leakage current. All analog leakage current flows
between each pin and one of the supply terminals, not to the other
switch terminal. For this reason, both sides of a given switch can
show leakage currents of either the same or opposite polarity.
The signal paths and GND are not connected.
V+ and GND power the internal logic and logic-level translators,
and set both the input and output logic limits. The logic level
translators convert the logic levels into switched V+ and V- sig-
nals to drive the analog signals’ gates. This drive signal is the only
connection between the logic supplies and signals and the analog
supplies. V+ and V- have ESD-protection diodes to GND.
The logic-level thresholds are TTL/CMOS compatible when
V+ = +5V. As V+ rises, the threshold increases slightly, so when
V+ reaches +12V, the threshold is about 3.1V – above the TTL
guaranteed, high-level minimum of 2.8V, but still compatible with
CMOS outputs.
Bipolar Supplies
The PS4530/PS4531/PS4532 operate with bipolar supplies between
±2.0V and ±6V. The V+ and V- supplies need not be symmetrical,
but their sum cannot exceed the +13V absolute maximum rating.
Single Supply
The PS4530/PS4531/PS4532 operate from a single supply between
+2V and 12V when V- is connected to GND. All of the bipolar
precautions must be observed. At room temperature, they actually
work with a single supply at, near, or below +1.7V, although as
supply voltage decreases, switch on-resistance and switching times
become very high.
High-Frequency Performance
In 50Ohm systerns, signal response is reasonably flat up to 50MHz
(see Typical Operating Characteristics). Above 20MHz, the on
response has several minor peaks that are highly layout depen-
dent. The problem is not in turning the switch on, but in turning it
off. The off-state switch acts lilke a capacitor and passes higher
frequencies with less attenuation. At 10MHz, off isolation is about
–65dB in 50Ohm systems, becoming worse (approximately 21dB
per decade) as frequency increases. Higher circuit impedances
also make off isolation worse. Adjacent channel attenuation is
about 3dB above that of a bare IC socket, and is due entirely to
capacitive coupling.
相關PDF資料 |
PDF描述 |
|---|---|
| PS4531EWPE | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO20 |
| PS4532EWPE | TRIPLE 2-CHANNEL, SGL ENDED MULTIPLEXER, PDSO20 |
| PS4530EWP | 8-CHANNEL, SGL ENDED MULTIPLEXER, PDSO20 |
| PS4531CWP | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO20 |
| PS4531CWPE | 4-CHANNEL, DIFFERENTIAL MULTIPLEXER, PDSO20 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
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| PS4-563K | 制造商:Ohmite Mfg Co 功能描述: |
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