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參數(shù)資料
| 型號： | ADG749BKSZ-REEL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SWITCH SPDT SC70-6 |
| 產(chǎn)品培訓(xùn)模塊： | Switch Fundamentals |
| 標(biāo)準(zhǔn)包裝： | 10,000 |
| 功能： | 開關(guān) |
| 電路： | 1 x SPDT - NC/NO |
| 導(dǎo)通狀態(tài)電阻： | 5 歐姆 |
| 電壓電源： | 單電源 |
| 電壓 - 電源，單路/雙路(±)： | 1.8 V ~ 5.5 V |
| 電流 - 電源： | 1nA |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-TSSOP，SC-88，SOT-363 |
| 供應(yīng)商設(shè)備封裝： | SC-70-6 |
| 包裝： | 帶卷 (TR) |
Data Sheet
ADG749
Rev. C | Page 11 of 12
APPLICATIONS INFORMATION
The ADG749 belongs to Analog Devices’ new family of CMOS
switches. This series of general-purpose switches has improved
switching times, offering lower on resistance, higher band-
widths, low power consumption, and low leakage currents.
ADG749 SUPPLY VOLTAGES
Functionality of the ADG749 extends from 1.8 V to 5.5 V single
supply, which makes it ideal for battery-powered instruments,
where power efficiency and performance are important design
parameters.
It is important to note that the supply voltage affects the input
signal range, the on resistance, and the switching times of the
part. By taking a look at the typical performance characteristics
and the specifications, the effects of the power supplies can be
clearly seen.
For VDD = 1.8 V operation, RON is typically 40 Ω over the
temperature range.
ON RESPONSE VS. FREQUENCY
Figure 21 illustrates the parasitic components that affect the
ac performance of CMOS switches (the switch is shown
surrounded by a box). Additional external capacitances will
further degrade some performance. These capacitances affect
feedthrough, crosstalk, and system bandwidth.
02075-
021
S
VIN
D
CDS
CD
RON
CLOAD
VOUT
RLOAD
Figure 21. Switch Represented by Equivalent Parasitic Components
The transfer function that describes the equivalent diagram of
the switch (Figure 21) is of the form A(s) shown below.
(
)
(
)
+
=
1
)
(
DS
ON
T
DS
ON
T
C
R
s
C
R
s
R
s
A
where:
RT = RLOAD/(RLOAD + RON)
CT = CLOAD + CD + CDS
The signal transfer characteristic is dependent on the switch
channel capacitance, CDS. This capacitance creates a frequency
zero in the numerator of the transfer function A(s). Because the
switch on resistance is small, this zero usually occurs at high
frequencies. The bandwidth is a function of the switch output
capacitance combined with CDS and the load capacitance. The
frequency pole corresponding to these capacitances appears in
the denominator of A(s).
The dominant effect of the output capacitance, CD, causes the
pole breakpoint frequency to occur first. Therefore, in order
to maximize bandwidth, a switch must have a low input and
output capacitance and low on resistance. The on response vs.
frequency plot for the ADG749 is shown in Figure 11.
OFF ISOLATION
Off isolation is a measure of the input signal coupled through
an off switch to the switch output. The capacitance, CDS, couples
the input signal to the output load when the switch is off, as
shown in Figure 22.
02075-
022
S
VIN
D
CDS
CD
CLOAD
VOUT
RLOAD
Figure 22. Off Isolation is Affected by External Load Resistance
and Capacitance
The larger the value of CDS, the larger the values of feed-
through that will be produced. The typical performance
characteristic graph of Figure 9 illustrates the drop in off
isolation as a function of frequency. From dc to roughly
200 kHz, the switch shows better than 95 dB isolation. Up to
frequencies of 10 MHz, the off isolation remains better than
67 dB. As the frequency increases, more and more of the input
signal is coupled through to the output. Off isolation can be
maximized by choosing a switch with the smallest CDS possible.
The values of load resistance and capacitance also affect off
isolation, since they contribute to the coefficients of the poles
and zeros in the transfer function of the switch when open.
(
)
(
)
(
)
+
=
1
)
(
DS
D
LOAD
DS
LOAD
C
R
s
C
R
s
A
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| ADG749BKSZ-REEL7 | 功能描述:IC SWITCH SPDT SC70-6 RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關(guān)，多路復(fù)用器，多路分解器 系列:- 特色產(chǎn)品:MicroPak? 標(biāo)準(zhǔn)包裝:1 系列:- 功能:開關(guān) 電路:2 x SPST - NC 導(dǎo)通狀態(tài)電阻:500 毫歐 電壓電源:單電源 電壓 - 電源，單路/雙路(±):1.4 V ~ 4.3 V 電流 - 電源:150nA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-XFDFN 供應(yīng)商設(shè)備封裝:8-XSON，SOT833-1 （1.95x1） 包裝:Digi-Reel® 其它名稱:568-5557-6 |
| ADG749BKSZ-REEL7 | 制造商:Analog Devices 功能描述:IC, ANALOG SWITCH, SINGLE, SPDT, SC-70-6 |
| ADG749BKSZ-REEL7 | 制造商:Analog Devices 功能描述:IC, SINGLE SPDT SWITCH |
| ADG751 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS, Low Voltage RF/Video, SPST Switch |
| ADG751ARM | 制造商:Analog Devices 功能描述:Analog Switch Single SPST 8-Pin MSOP 制造商:Rochester Electronics LLC 功能描述:SINGLE SPST T-SWITCH I.C - Bulk |
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