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Part: MAX7409
Category:
Analog & Mixed-Signal Processing
-> Filters
Description: 5th-Order, Lowpass, Switched-capacitor Filters
Company: Maxim Integrated Products
Datasheet: Download MAX7409 datasheet File size : 554 kB
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Datasheet text preview:
19-4766; Rev 1; 9/98
5th-Order, Lowpass, Switched-Capacitor Filters
General Description
The MAX7409/MAX7410/MAX7413/MAX7414 5th-order, lowpass, switched-capacitor filters (SCFs) operate from a single +5V (MAX7409/MAX7410) or +3V (MAX7413/ MAX7414) supply. These devices draw only 1.2mA of supply current and allow corner frequencies from 1Hz to 15kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They feature a shutdown mode, which reduces the supply current to 0.2µA. Two clocking options are available on these devices: self-clocking (through the use of an external capacitor) or external clocking for tighter corner-frequency control. An offset adjust pin allows for adjustment of the DC output level. The MAX7409/MAX7413 Bessel filters provide low overshoot and fast settling, while the MAX7410/MAX7414 Butterworth filters provide a maximally flat passband response. Their fixed response simplifies the design task to selecting a clock frequency.
Features
o 5th-Order Lowpass Filters Bessel Response (MAX7409/MAX7413) Butterworth Response (MAX7410/MAX7414) o Clock-Tunable Corner Frequency (1Hz to 15kHz) o Single-Supply Operation +5V (MAX7409/MAX7410) +3V (MAX7413/MAX7414) o Low Power 1.2mA (operating mode) 0.2µA (shutdown mode) o Available in 8-Pin µMAX/DIP Packages o Low Output Offset: ±4mV
MAX7409/MAX7410/MAX7413/MAX7414
Ordering Information
PART MAX7409CUA MAX7409CPA MAX7409EUA MAX7409EPA MAX7410CUA MAX7410CPA MAX7410EUA MAX7410EPA TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 µMAX 8 Plastic DIP 8 µMAX 8 Plastic DIP 8 µMAX 8 Plastic DIP 8 µMAX 8 Plastic DIP
Applications
ADC Anti-Aliasing DAC Postfiltering Air-Bag Electronics CT2 Base Stations Speech Processing
Selector Guide
PART MAX7409 MAX7410 MAX7413 MAX7414 FILTER RESPONSE Bessel Butterworth Bessel Butterworth OPERATING VOLTAGE (V) +5 +5 +3 +3
Ordering Information continued at end of data sheet.
Typical Operating Circuit
VSUPPLY
Pin Configuration
TOP VIEW
0.1µF VDD INPUT IN SHDN OUT OUTPUT
COM 1 IN 2 GND 3
8 7
CLK SHDN OS OUT
CLOCK CLK
VDD 4
MAX7409 MAX7410 MAX7413 MAX7414
µMAX/DIP
6 5
MAX7409 MAX7410 MAX7413 MAX7414
GND
COM OS 0.1µF
________________________________________________________________ Maxim Integrated Products
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5th-Order, Lowpass, Switched-Capacitor Filters MAX7409/MAX7410/MAX7413/MAX7414
ABSOLUTE MAXIMUM RATINGS
VDD to GND .....-0.3V to +6V IN, OUT, COM, OS, CLK, SHDN .......-0.3V to (VDD + 0.3V) OUT Short-Circuit Duration.........1sec Continuous Power Dissipation (TA = +70°C) 8-Pin DIP (derate 9.09mW/°C above +70°C) ......727mW 8-Pin µMAX (derate 4.1mW/°C above +70°C) ....330mW Operating Temperature Ranges MAX74 _ _C_A .........0°C to +70°C MAX74 _ _E_A ......-40°C to +85°C Storage Temperature Range .....-65°C to +160°C Lead Temperature (soldering, 10sec) .....+300°C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS--MAX7409/MAX7410
(VDD = +5V, filter output measured at OUT, 10k || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER FILTER CHARACTERISTICS Corner Frequency Clock-to-Corner Ratio Clock-to-Corner Tempco Output Voltage Range Output Offset Voltage DC Insertion Gain with Output Offset Removed Total Harmonic Distortion plus Noise Offset Voltage Gain COM Voltage Range Input Voltage Range at OS Input Resistance at COM Clock Feedthrough Resistive Output Load Drive Maximum Capacitive Output Load Drive Input Leakage Current at COM Input Leakage Current at OS CLOCK Internal Oscillator Frequency Clock Output Current (Internal Oscillator Mode) Clock Input High Clock Input Low fOSC ICLK VIH VIL COSC = 1000pF (Note 3) VCLK = 0 or 5V 4.5 0.5 21 30 ±13.5 38 ±20 kHz µA V V RL CL SHDN = GND, VCOM = 0 to VDD VOS = 0 to VDD 10 50 THD+N AOS VCOM VOS RCOM VOFFSET VIN = VCOM = VDD / 2 VCOM = VDD / 2 (Note 2) fIN = 200Hz, VIN = 4Vp-p, measurement bandwidth = 22kHz OS to OUT Input, COM externally driven Output, COM unconnected Input, OS externally driven 110 2.0 2.3 MAX7409 MAX7410 -0.2 0.25 ±4 0 -85 -78 1 2.5 2.5 VCOM ±0.1 180 5 1 500 ±0.1 ±0.1 ±10 ±10 3.0 2.7 fc fCLK / fc (Note 1) 0.001 to 15 100:1 10 VDD - 0.25 ±25 0.2 ppm/°C V mV dB dB V/V V V k mVp-p k pF µA µA kHz SYMBOL CONDITIONS MIN TYP MAX UNITS
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5th-Order, Lowpass, Switched-Capacitor Filters
ELECTRICAL CHARACTERISTICS--MAX7409/MAX7410
(VDD = +5V, filter output measured at OUT, 10k || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER POWER REQUIREMENTS Supply Voltage Supply Current Shutdown Current Power-Supply Rejection Ratio SHUTDOWN SHDN Input High SHDN Input Low SHDN Input Leakage Current VSDH VSDL V SHDN = 0 to VDD ±0.2 4.5 0.5 ±10 V V µA VDD IDD I SHDN PSRR Operating mode, no load SHDN = GND IN = COM (Note 4) 4.5 1.2 0.2 70 5.5 1.5 1 V mA µA dB SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX7409/MAX7410/MAX7413/MAX7414
ELECTRICAL CHARACTERISTICS--MAX7413/MAX7414
(VDD = +3V, filter output measured at OUT pin, 10k || 50pF load to GND at OUT, OS = COM, 0.1µF capacitor from COM to GND, SHDN = VDD, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER FILTER CHARACTERISTICS Corner Frequency Clock-to-Corner Ratio Clock-to-Corner Tempco Output Voltage Range Output Offset Voltage DC Insertion Gain with Output Offset Removed Total Harmonic Distortion plus Noise Offset Voltage Gain COM Voltage Range Input Voltage Range at OS Input Resistance at COM Clock Feedthrough Resistance Output Load Drive Maximum Capacitive Output Load Drive Input Leakage Current at COM Input Leakage Current at OS RL CL SHDN = GND, VCOM = 0 to VDD VOS = 0 to VDD 10 50 THD+N AOS VCOM VOS RCOM VOFFSET VIN = VCOM = VDD / 2 VCOM = VDD / 2 (Note 2) fIN = 200Hz, VIN = 2.5Vp-p, measurement bandwidth = 22kHz OS to OUT Input, COM externally driven Output, COM unconnected Input, OS externally driven 110 1.4 1.4 MAX7413 MAX7414 -0.2 0.25 ±4 0 -83 -81 1 1.5 1.5 VCOM ±0.1 180 3 1 500 ±0.1 ±0.1 ±10 ±10 1.6 1.6 fC fCLK / fC (Note 1) 0.001 to 15 100:1 10 VDD - 0.25 ±25 +0.2 ppm/°C V mV dB dB V/V V V V k mVp-p k pF µA µA kHz SYMBOL CONDITIONS MIN TYP MAX UNITS
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