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參數(shù)資料
| 型號： | MAX7491EEE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 17/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC FILTER SW CAP DUAL 16-QSOP |
| 產(chǎn)品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 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： | 2.7 V ~ 3.6 V |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應商設備封裝： | 16-QSOP |
| 包裝： | 帶卷 (TR) |
MAX7490/MAX7491
Dual Universal Switched-Capacitor Filters
8
_______________________________________________________________________________________
_______________Detailed Description
The MAX7490/MAX7491 are universal switched-capaci-
tor filters designed with a fixed internal fCLK/fO ratio of
100:1. Operating modes use external resistors connect-
ed in different arrangements to realize different filter
functions (highpass, lowpass, bandpass, notch) in all of
the classical filter topologies (Butterworth, Bessel, ellip-
tic, Chebyshev). Figure 1 shows a block diagram.
Clock Signal
External Clock
The MAX7490/MAX7491 switched-capacitor filters are
designed for use with external clocks that have a 50%
±5% duty cycle. When using an external clock, drive
the EXTCLK pin high or connect to VDD. Drive CLK with
CMOS logic levels (GND and VDD). Varying the rate of
the external clock adjusts the center frequency of the
filter:
fO = fCLK /100
Internal Clock
When using the internal oscillator, drive the EXTCLK pin
low or connect to GND and connect a capacitor (COSC)
between CLK and GND. The value of the capacitor
(COSC) determines the oscillator frequency as follows:
fOSC (kHz) = 135 x 103 / COSC (pF)
Since COSC is in the low picofarads, minimize the stray
capacitance at CLK so that it does not affect the inter-
nal oscillator frequency. Varying the frequency of the
internal oscillator adjusts the filter’s center frequency by
a 100:1 clock-to-center frequency ratio. For example,
an internal oscillator frequency of 135kHz produces a
nominal center frequency of 1.35kHz.
NAME
PIN
FILTER A
FILTER B
FUNCTION
LP_
1
16
2nd-Order Lowpass Filter Output
BP_
2
15
2nd-Order Bandpass Filter Output
N_/HP_
3
14
2nd-Order Notch/Highpass Filter Output
INV_
4
13
Inverting Input of Filter Summing Op Amp
S_
5
12
Summing Input. The connection of the summing input, along with the other
resistor connections, determine the circuit topology (mode) of each 2nd-
order section. S_ must never be left unconnected.
SHDN
6
Shutdown Input. Drive SHDN low to enable shutdown mode; drive SHDN
high or connect to VDD for normal operation.
GND
7
Ground Pin
VDD
8
Positive Supply. Bypass VDD with a 0.1F capacitor to GND. A low-noise
supply is recommended. Input +5V for MAX7490 or +3V for MAX7491.
CLK
9
Clock Input. Connect CLK to an external capacitor (COSC) between CLK and
ground to set the internal oscillator frequency. For external clock operation,
drive CLK with a CMOS-level clock. The duty cycle of the external clock
should be between 45% and 55% for best performance.
EXTCLK
10
External/Internal Clock Select Input. Connect EXTCLK to VDD when driving
CLK externally. Connect EXTCLK to GND when using the internal oscillator.
COM
11
Common Pin. Biased internally at VDD/2. Bypass externally to GND with
0.1F capacitor. To override the internal biasing, drive COM with an external
low-impedance source.
Pin Description
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| MAX749C/D | 功能描述:顯示驅(qū)動器和控制器 RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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| MAX749CPA+ | 功能描述:顯示驅(qū)動器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
| MAX749CPA+T | 制造商:Maxim Integrated Products 功能描述: |
| MAX749CSA | 功能描述:顯示驅(qū)動器和控制器 Digitally Adjustable LCD Bias Supply RoHS:否 制造商:Panasonic Electronic Components 工作電源電壓:2.7 V to 5.5 V 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Reel |
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