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參數資料
| 型號： | ADG702BRT |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | CMOS Low Voltage 2ohm SPST Switches |
| 中文描述： | 1-CHANNEL, SGL POLE SGL THROW SWITCH, PDSO6 |
| 封裝： | PLASTIC, MO-178AB, SOT-23, 6 PIN |
| 文件頁數： | 8/8頁 |
| 文件大?。?/td> | 108K |
| 代理商： | ADG702BRT |
ADG701/ADG702
–8–
REV. A
APPLICATIONS INFORMATION
The ADG701/ADG702 belongs to Analog Devices’ new fam-
ily of CMOS switches. This series of general purpose switches
have improved switching times, lower on resistance, higher
bandwidth, low power consumption and low leakage currents.
ADG701/ADG702 Supply Voltages
Functionality of the ADG701/ADG702 extends from +1.8 V to
+5.5 V single supply, which makes it ideal for battery powered
instruments, where important design parameters are power
efficiency and performance.
It is important to note that the supply voltage effects 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 V
DD
= +1.8 V operation, R
ON
is typically 40
over the
temperature range.
On Response vs. Frequency
Figure 7 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.
S
V
IN
D
C
DS
R
ON
C
D
C
LOAD
R
LOAD
V
OUT
Figure 7. Switch Represented by Equivalent Parasitic
Components
The transfer function that describes the equivalent diagram of
the switch (Figure 7) is of the form (A)s shown below.
A
(
s
)
=
R
T
s
(
R
ON
C
DS
)
+
1
s
(
R
ON
C
T
R
T
)
+
1
where:
C
T
= C
LOAD
+ C
D
+ C
DS
R
T
= R
LOAD
/(R
LOAD
+ R
ON
)
The signal transfer characteristic is dependent on the switch
channel capacitance, C
DS
. 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 C
DS
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, C
D
, 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. Fre-
quency plot for the ADG701/ADG702 can be seen in Figure 6.
Off Isolation
Off isolation is a measure of the input signal coupled through an
off switch to the switch output. The capacitance, C
DS
, couples
the input signal to the output load, when the switch is off, as
shown in Figure 8.
S
V
IN
D
C
DS
C
D
C
LOAD
R
LOAD
V
OUT
Figure 8. Off Isolation Is Affected by External Load Resis-
tance and Capacitance
The larger the value of C
DS
, larger values of feedthrough will be
produced. The typical performance characteristic graph of Fig-
ure 5 illustrates the drop in off-isolation as a function of fre-
quency. From dc to roughly 1 MHz, the switch shows better
than –75 dB isolation. Up to frequencies of 10 MHz, the off
isolation remains better than –55 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 C
DS
as possible. The values of load resistance
and capacitance affect off isolation also, as they contribute to
the coefficients of the poles and zeros in the transfer function of
the switch when open.
A
(
s
)
=
s
(
R
LOAD
C
DS
)
s
(
R
LOAD
)(
C
T
)
+
1
8-Lead
m
SOIC
(RM-8)
8
5
4
1
0.122 (3.10)
0.114 (2.90)
0.199 (5.05)
0.187 (4.75)
PIN 1
0.0256 (0.65) BSC
0.120 (3.05)
0.112 (2.84)
0.122 (3.10)
0.114 (2.90)
SEATING
PLANE
0.006 (0.15)
0.002 (0.05)
0.018 (0.46)
0.008 (0.20)
0.043 (1.09)
0.037 (0.94)
0.011 (0.28)
0.003 (0.08)
0.028 (0.71)
0.016 (0.41)
33°
27°
0.120 (3.05)
0.112 (2.84)
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
6-Lead Plastic Surface Mount (SOT-23)
(RT-6)
0.122 (3.10)
0.106 (2.70)
PIN 1
0.118 (3.00)
0.098 (2.50)
0.075 (1.90)
BSC
0.037 (0.95) BSC
1
3
4
5
6
2
0.071 (1.80)
0.059 (1.50)
0.009 (0.23)
0.003 (0.08)
0.022 (0.55)
0.014 (0.35)
10
8
0
8
0.020 (0.50)
0.010 (0.25)
0.006 (0.15)
0.000 (0.00)
0.051 (1.30)
0.035 (0.90)
SEATING
PLANE
0.057 (1.45)
0.035 (0.90)
C
P
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ADG702BRT-REEL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: |
| ADG702BRT-REEL7 | 功能描述:IC SWITCH SPST SOT23-6 RoHS:否 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 標準包裝:1,000 系列:- 功能:多路復用器 電路:1 x 4:1 導通狀態(tài)電阻:- 電壓電源:雙電源 電壓 - 電源，單路/雙路(±):±5V 電流 - 電源:7mA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:帶卷 (TR) |
| ADG702BRTZ | 制造商:Analog Devices 功能描述:ADG702BRTZ |
| ADG702BRTZ-REEL | 功能描述:IC SWITCH SPST SOT23-6 RoHS:是 類別:集成電路 (IC) >> 接口 - 模擬開關，多路復用器，多路分解器 系列:- 標準包裝:48 系列:- 功能:開關 電路:4 x SPST - NO 導通狀態(tài)電阻:100 歐姆 電壓電源:單/雙電源 電壓 - 電源，單路/雙路(±):2 V ~ 12 V，±2 V ~ 6 V 電流 - 電源:50nA 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:16-SOIC 包裝:管件 |
| ADG702BRTZ-REEL1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:CMOS Low Voltage 2 ?? SPST Switches |
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