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| 型号： | MAX7490CEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC FILTER SW CAP DUAL 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 滤波器类型： | 通用开关电容器 |
| 频率 - 截止或中心： | 40kHz |
| 滤波器数： | 2 |
| 滤波器阶数： | 2nd |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP |
| 包装： | 带卷 (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
相关PDF资料 |
PDF描述 |
|---|---|
| VE-B74-IY-F1 | CONVERTER MOD DC/DC 48V 50W |
| MAX7491CEE+T | IC FILTER SW CAP DUAL 16-QSOP |
| VE-21Z-IW-F3 | CONVERTER MOD DC/DC 2V 40W |
| MAX7424CUA+T | IC FILTER LOWPASS 5TH 8-UMAX |
| VE-21Z-IW-F2 | CONVERTER MOD DC/DC 2V 40W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX7490EEE | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7490EEE+ | 功能描述:有源滤波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7490EEE+T | 功能描述:有源滤波器 Dual Universal Switched-Cap RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7490EEE-T | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
| MAX7491CEE | 功能描述:有源滤波器 RoHS:否 制造商:Maxim Integrated 通道数量:1 截止频率:150 KHz 电源电压-最大:11 V 电源电压-最小:4.74 V 最大工作温度:+ 85 C 安装风格:Through Hole 封装 / 箱体:PDIP N 封装:Tube |
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