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| 型号： | MAX7480ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/8页 |
| 文件大小： | 0K |
| 描述： | IC FILTER LOWPASS 8TH 8-SOIC |
| 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： | 巴特沃斯，低通开关电容器 |
| 频率 - 截止或中心： | 2kHz |
| 滤波器数： | 4 |
| 滤波器阶数： | 8th |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
MAX7480
8th-Order, Lowpass, Butterworth,
Switched-Capacitor Filter
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
Anti-Aliasing and Post-DAC Filtering
When using the MAX7480 for anti-aliasing or post-DAC
filtering, synchronize the DAC and the filter clocks. If
the clocks are not synchronized, beat frequencies may
alias into the passband.
The high clock-to-corner frequency ratio (100:1) also
eases the requirements of pre- and post-SCF filtering.
At the input, a lowpass filter prevents the aliasing of fre-
quencies around the clock frequency into the pass-
band. At the output, a lowpass filter attenuates the
clock feedthrough.
A high clock to corner-frequency ratio allows a simple
RC lowpass filter, with the cutoff frequency set above
the SCF corner frequency to provide input anti-aliasing
and reasonable output clock attenuation.
Harmonic Distortion
Harmonic distortion arises from nonlinearities within the
filter. These nonlinearities generate harmonics when a
pure sine wave is applied to the filter input. Table 1 lists
the MAX7480’s typical harmonic-distortion values with
a 10k
load at TA = +25°C.
VDD
V+ = +2.5V
V- = -2.5V
IN
CLK
GND
INPUT
OUTPUT
OUT
0.1
F
CLOCK
*DRIVE SHDN TO V- FOR LOW-POWER SHUTDOWN MODE.
SHDN
COM
OS
0.1
F
MAX7480
*
V+
V-
Figure 4. Dual-Supply Operation
5th
3rd
-89
-68
-93
-73
200
100
fCLK
(kHz)
4th
2nd
-85
-91
TYPICAL HARMONIC DISTORTION (dB)
-82
-89
4
2
1
MAX7480
VIN
(Vp-p)
fC
(kHz)
FILTER
400
200
fIN
(Hz)
Table 1. Typical Harmonic Distortion
TRANSISTOR COUNT: 1116
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