Datasheet MAX7409, MAX7410, MAX7413, MAX7414 (Maxim) - 7
| Manufacturer | Maxim |
| Description | 5th-Order, Lowpass, Switched-Capacitor Filters |
| Pages / Page | 12 / 7 — 5th-Order, Lowpass,. Switched-Capacitor Filters. … |
| File Format / Size | PDF / 137 Kb |
| Document Language | English |
5th-Order, Lowpass,. Switched-Capacitor Filters. MAX7409/MAX7410/MAX7413/MAX7414
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5th-Order, Lowpass, Switched-Capacitor Filters MAX7409/MAX7410/MAX7413/MAX7414 Typical Operating Characteristics (continued)
(VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, fCLK = 100kHz, SHDN = VDD, COM = OS = VDD / 2, TA = +25°C, unless otherwise noted.)
OUTPUT OFFSET VOLTAGE OUTPUT OFFSET VOLTAGE vs. TEMPERATURE vs. SUPPLY VOLTAGE
-3.00 -2.0 -3.25 -2.5 MAX7409 toc17 MAX7409 toc18 V -3.50 DD = +3V -3.0 -3.75 -3.5 VDD = +5V -4.00 -4.0 OFFSET VOLTAGE (mV) DC OFFSET VOLTAGE (mV) -4.25 -4.5 -4.50 -5.0 -40 -20 0 20 40 60 80 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 TEMPERATURE (°C) SUPPLY VOLTAGE (V)
Pin Description PIN NAME FUNCTION
Common Input Pin. Biased internally at midsupply. Bypass COM externally to GND with a 0.1µF capacitor. 1 COM To override internal biasing, drive COM with an external supply. 2 IN Filter Input 3 GND Ground 4 VDD Positive Supply Input: +5V for MAX7409/MAX7410, +3V for MAX7413/MAX7414. 5 OUT Filter Output Offset Adjust Input. To adjust output offset, connect OS to an external supply through a resistive voltage- 6 OS divider (Figure 3). Connect OS to COM if no offset adjustment is needed. Refer to the Offset and Common- Mode Input Adjustment section. 7 SHDN Shutdown Input. Drive low to enable shutdown mode; drive high or connect to VDD for normal operation. Clock Input. Connect an external capacitor (C 8 CLK OSC) from CLK to ground: fOSC (kHz) = 30 x 103 / COSC (pF). To override the internal oscillator, connect CLK to an external clock: fC = fCLK /100.
_______________Detailed Description
higher frequencies). Bessel filters settle quickly—an important characteristic in applications that use a multi- The MAX7409/MAX7413 Bessel filters provide low over- plexer (mux) to select an input signal for an analog-to- shoot and fast settling responses, and the MAX7410/ digital converter (ADC). An anti-aliasing filter placed MAX7414 Butterworth filters provide a maximally flat between the mux and the ADC must settle quickly after passband response. All parts operate with a 100:1 a new channel is selected. clock-to-corner frequency ratio and a 15kHz maximum corner frequency.
Butterworth Characteristics
Lowpass Butterworth filters such as the MAX7410/
Bessel Characteristics
MAX7414 provide a maximally flat passband response, Lowpass Bessel filters such as the MAX7409/MAX7413 making them ideal for instrumentation applications that delay all frequency components equally, preserving the require minimum deviation from the DC gain throughout shape of step inputs (subject to the attenuation of the the passband.
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(VDD = +5V for MAX7409/MAX7410, VDD = +3V for MAX7413/MAX7414, fCLK = 100kHz, SHDN = VDD, COM = OS = VDD / 2, TA = +25°C, unless otherwise noted.)
OUTPUT OFFSET VOLTAGE OUTPUT OFFSET VOLTAGE vs. TEMPERATURE vs. SUPPLY VOLTAGE
-3.00 -2.0 -3.25 -2.5 MAX7409 toc17 MAX7409 toc18 V -3.50 DD = +3V -3.0 -3.75 -3.5 VDD = +5V -4.00 -4.0 OFFSET VOLTAGE (mV) DC OFFSET VOLTAGE (mV) -4.25 -4.5 -4.50 -5.0 -40 -20 0 20 40 60 80 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 TEMPERATURE (°C) SUPPLY VOLTAGE (V)
Pin Description PIN NAME FUNCTION
Common Input Pin. Biased internally at midsupply. Bypass COM externally to GND with a 0.1µF capacitor. 1 COM To override internal biasing, drive COM with an external supply. 2 IN Filter Input 3 GND Ground 4 VDD Positive Supply Input: +5V for MAX7409/MAX7410, +3V for MAX7413/MAX7414. 5 OUT Filter Output Offset Adjust Input. To adjust output offset, connect OS to an external supply through a resistive voltage- 6 OS divider (Figure 3). Connect OS to COM if no offset adjustment is needed. Refer to the Offset and Common- Mode Input Adjustment section. 7 SHDN Shutdown Input. Drive low to enable shutdown mode; drive high or connect to VDD for normal operation. Clock Input. Connect an external capacitor (C 8 CLK OSC) from CLK to ground: fOSC (kHz) = 30 x 103 / COSC (pF). To override the internal oscillator, connect CLK to an external clock: fC = fCLK /100.
_______________Detailed Description
higher frequencies). Bessel filters settle quickly—an important characteristic in applications that use a multi- The MAX7409/MAX7413 Bessel filters provide low over- plexer (mux) to select an input signal for an analog-to- shoot and fast settling responses, and the MAX7410/ digital converter (ADC). An anti-aliasing filter placed MAX7414 Butterworth filters provide a maximally flat between the mux and the ADC must settle quickly after passband response. All parts operate with a 100:1 a new channel is selected. clock-to-corner frequency ratio and a 15kHz maximum corner frequency.
Butterworth Characteristics
Lowpass Butterworth filters such as the MAX7410/
Bessel Characteristics
MAX7414 provide a maximally flat passband response, Lowpass Bessel filters such as the MAX7409/MAX7413 making them ideal for instrumentation applications that delay all frequency components equally, preserving the require minimum deviation from the DC gain throughout shape of step inputs (subject to the attenuation of the the passband.
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