參數(shù)資料
型號(hào)： MAX7490EEE+T
廠商： Maxim Integrated Products
文件頁數(shù)： 6/18頁
文件大小： 0K
描述： IC FILTER SW CAP DUAL 16-QSOP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
濾波器類型： 通用開關(guān)電容器
頻率 - 截止或中心： 40kHz
濾波器數(shù)： 2
濾波器階數(shù)： 2nd
電源電壓： 4.5 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-QSOP
包裝： 帶卷 (TR)
MAX7490/MAX7491
Dual Universal Switched-Capacitor Filters
14
______________________________________________________________________________________
Mode 3A Design Equations
Note: When the passband gain error exceeds 1dB, the
use of capacitor CC 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 (CC-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 sec-
tion. Table 4 lists the formula for the output offset volt-
age 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 VDD to GND with at least a 0.1F capacitor.
VDD should be isolated from other digital or high-volt-
age analog supplies. If dual supplies are required, con-
nect 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-sup-
ply performances are equivalent. For dual-supply oper-
ation, drive CLK, SHDN, and EXTCLK from GND (which
is now V-) to VDD. If using the internal oscillator in dual-
supply mode, COSC 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 0.1F bypass capacitor from
COM to GND is sufficient. If the VDD supply has signifi-
cant 60Hz energy, increase this capacitor to 1F or
greater to provide better power-supply rejection.
f
R
f
fR
R
Q
R
H
R
H
R
H
R
Hf
Hz
R
Hat f
f
R
O
CLK
n
CLK
H
L
OHP
OLP
OBP
ON
G
L
ON
CLK
G
H
=
→=
==
100
2
4
100
3
2
4
2
1
4
1
3
1
0
4
1
2
1
2
()
(/ )
Figure 8. Block Diagram of a 2nd-Order Section Showing the Input Offsets
Σ
∫
N/HP
S
INV
BP
LP
COM
VOS1
VOS2
VOS3
+
-
PART
GBW (MHz)
SLEW RATE (V/
μs)
ISUPPLY/AMP (mA)
PIN-PACKAGE
MAX4281
2
0.7
0.5
5 SOT23
MAX4322
5
2.0
1.1
5 SOT23
MAX4130
10
4.0
1.15
5 SOT23
MAX4490
10
10.0
2.0
5 SOT23
Table 3. Suggested External Op Amps
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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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