參數(shù)資料
型號： MAX7490-MAX7491
廠商： Maxim Integrated Products, Inc.
英文描述： Dual Universal Switched-Capacitor Filters
中文描述： 雙路通用開關(guān)電容濾波器
文件頁數(shù)： 14/18頁
文件大?。?/td> 343K
代理商： MAX7490-MAX7491
M
Dual Universal Switched-Capacitor Filters
14
______________________________________________________________________________________
Mode 3A Design Equations
Note
: When the passband gain error exceeds 1dB, the
use of capacitor C
C
between the lowpass output and
the inverting input will reduce the gain error. The value
can best be determined experimentally. Typically, it
should be about 5pF/dB (C
C-MAX
= 15pF).
Offset Voltage
Switched-capacitor integrators generally exhibit higher
input offsets than discrete RC integrators. The larger
offset is mainly due to the charge injection of the
CMOS switches into the integrating capacitors. The
internal op amp offset also adds to the overall offset
value. Figure 8 shows the input offsets from a single
2nd-order section. Table 4 lists the formula for the out-
put offset voltage for various modes and output pins.
Power Supplies
The MAX7490 operates from a single +5V supply, and
the MAX7491 operates from a single +3V supply.
Bypass V
DD
to GND with at least a 0.1μF capacitor.
V
DD
should be isolated from other digital or high-volt-
age analog supplies. If dual supplies are required,
connect the COM pin to the system ground and the
GND pin to the negative supply. Figure 9 shows an
example of dual-supply operation. Single-supply and
dual-supply performances are equivalent. For dual-
supply operation, drive CLK,
SHDN
, and EXTCLK from
GND (which is now V-) to V
DD
. If using the internal
oscillator in dual-supply mode, C
OSC
can be returned
to either GND or the actual ground voltage. Use the
MAX7490 for ±2.5V and use the MAX7491 for ±1.5V.
For most applications, a 0.1μF bypass capacitor from
COM to GND is sufficient. If the V
DD
supply has signifi-
cant 60Hz energy, increase this capacitor to 1μF or
greater to provide better power-supply rejection.
f
f
R
R
R
R
f
f
Q
R
R
R
R
R
R
R
R
R
R
H
H
H
H
f
Hz
0
R
R
R
R
R
R
H
at f
(
f
R
R
O
CLK
100
n
CLK
100
H
L
OHP
OLP
OBP
ON
G
L
ON
CLK
G
H
=
=
=
=
=
=
→
=
=
=
2
4
3
2
2
4
2
1
4
1
3
1
4
1
2
2
1
1
2
(
)
/ )
Figure 8. Block Diagram of a 2nd-Order Section Showing the Input Offsets
Σ
∫
∫
N/HP
S
INV
BP
LP
COM
V
OS1
V
OS2
V
OS3
+
-
PART
MAX4281
MAX4322
MAX4130
MAX4490
GBW (MHz)
2
5
10
10
SLEW RATE (V/
μ
s)
0.7
2.0
4.0
10.0
ISUPPLY/AMP (mA)
0.5
1.1
1.15
2.0
PIN-PACKAGE
5 SOT23
5 SOT23
5 SOT23
5 SOT23
Table 3. Suggested External Op Amps
相關(guān)PDF資料
PDF描述
MAX7491CEE SILICON CONTROLLED RECTIFIER,400V V(DRM),70A I(T),TO-209AA RoHS Compliant: Yes
MAX7490CEE Dual Universal Switched-Capacitor Filters
MAX7490EEE Dual Universal Switched-Capacitor Filters
MAX7491EEE 4-Bit D-type Registers with 3-State Outputs 16-CDIP -55 to 125
MAX749CPA Digitally Adjustable LCD Bias Supply
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX7491CEE 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7491CEE+ 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7491CEE+T 功能描述:有源濾波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7491CEE-T 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
MAX7491EEE 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數(shù)量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube
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