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| 型号： | ADG702LBRTZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/12页 |
| 文件大小： | 0K |
| 描述： | IC SWITCH SPST SOT23-6 |
| 产品培训模块： | iCMOS™ Switches and Multiplexers for Data Acquisition Switch Fundamentals |
| 标准包装： | 1 |
| 功能： | 开关 |
| 电路： | 1 x SPST- NC |
| 导通状态电阻： | 3 欧姆 |
| 电压电源： | 单电源 |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V |
| 电流 - 电源： | 1nA |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 标准包装 |
| 产品目录页面： | 800 (CN2011-ZH PDF) |
| 其它名称： | ADG702LBRTZ-REEL7DKR |
ADG701L/ADG702L
Rev. 0 | Page 10 of 12
APPLICATIONS INFORMATION
The ADG701L/ADG702L belong to the Analog Devices new
family 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.
SUPPLY VOLTAGES
Functionality of the ADG701L/ADG702L extends from 1.8 V to
5.5 V single supply, making the parts 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. The effects of the power supplies can be clearly seen in the
sections.
For VDD = 1.8 V operation, RON is typically 40 Ω over the
temperature range.
BANDWIDTH
Figure 19 illustrates the parasitic components that affect the ac
performance of CMOS switches (a box surrounds the switch).
Additional external capacitances further degrade some perform-
ance. These capacitances affect feedthrough, crosstalk, and
system bandwidth.
05486-018
VIN
SD
RON
CDS
CD
CLOAD
RLOAD
VOUT
Figure 19. Switch Represented by Equivalent Parasitic Components
The transfer function that describes the equivalent diagram of
the switch (see Figure 19) is of the form A(s), as shown in the
following equation:
+
=
1
)
(
1
)
(
)
(
T
ON
DS
ON
T
R
C
R
s
C
R
s
R
s
A
where 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. In order to maximize
bandwidth, a switch must have a low input and output capaci-
tance and low on resistance. The on response versus frequency
for the ADG701L/ADG702L 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 (see
05486-019
VIN
SD
CDS
CD
CLOAD
RLOAD
VOUT
Figure 20. Off Isolation Is Affected by External Load Resistance and
Capacitance
The larger the value of CDS, the larger the values of feedthrough
produced. Figure 10 illustrates the drop in off isolation as a
function of frequency. 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 CDS possible. The values
of load resistance and capacitance also affect off isolation, as
they contribute to the coefficients of the poles and zeros in the
transfer function of the switch when open.
+
=
1
)
)(
(
1
)
(
)
(
T
LOAD
DS
LOAD
T
C
R
s
C
R
s
R
s
A
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