19-1710; Rev 0; 4/00 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters Features 5th-Order, Elliptic Lowpass Filters Low Noise and Distortion: -80dB THD + Noise Clock-Tunable Corner Frequency (1Hz to 12kHz) Single-Supply Operation +5V (MAX7426) +3V (MAX7427) Low Power 0.8mA (Operating Mode) 0.2A (Shutdown Mode) Available in 8-Pin MAX/PDIP Packages Low Output Offset: 4mV Applications Ordering Information ADC Anti-Aliasing CT2 Base Stations PART TEMP. RANGE Post-DAC Filtering Speech Processing MAX7426CUA 0C to +70C MAX7426CPA MAX7426EUA MAX7426EPA MAX7427CUA 0C to +70C -40C to +85C -40C to +85C MAX7427CPA MAX7427EUA MAX7427EPA 0C to +70C -40C to +85C -40C to +85C Selector Guide TRANSITION RATIO OPERATING VOLTAGE (V) MAX7426 r = 1.25 +5 MAX7427 r = 1.25 +3 PART PIN-PACKAGE 8 MAX 8 Plastic DIP 8 MAX 8 Plastic DIP 0C to +70C 8 MAX 8 Plastic DIP 8 MAX 8 Plastic DIP Pin Configuration Typical Operating Circuit VSUPPLY TOP VIEW 0.1F VDD INPUT IN COM 1 SHDN OUT OUTPUT IN 2 GND MAX7426 MAX7427 CLOCK CLK VDD 4 COM GND OS 3 MAX7426 MAX7427 0.1F 8 CLK 7 SHDN 6 OS 5 OUT MAX/PDIP ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX7426/MAX7427 General Description The MAX7426/MAX7427 5th-order, lowpass, elliptic, switched-capacitor filters (SCFs) operate from a single +5V (MAX7426) or +3V (MAX7427) supply. The devices draw only 0.8mA of supply current and allow corner frequencies from 1Hz to 12kHz, making them ideal for low-power post-DAC filtering and anti-aliasing applications. They can be put into a low-power mode, reducing supply current to 0.2A. Two clocking options are available: self-clocking (through the use of an external capacitor) or external clocking for tighter cutoff-frequency control. An offset-adjust pin allows for adjustment of the DC output level. The MAX7426/MAX7427 deliver 37dB of stopband rejection and a sharp rolloff with a transition ratio of 1.25. Their fixed response limits the design task to selecting a clock frequency. MAX7426/MAX7427 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters 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.......................................................1s Continuous Power Dissipation (TA = +70C) 8-Pin MAX (derate 4.1mW/C above +70C) .............330mW 8-Pin PDIP (derate 6.90mW/C above +70C).............552mW Operating Temperature Ranges MAX742 _C_A ....................................................0C to +70C MAX742 _E_A .................................................-40C to +85C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s) .................................+300C 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--MAX7426 (VDD = +5V, filter output measured at OUT, 10k || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1F from COM to GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FILTER Corner-Frequency Range Clock-to-Corner Ratio fC (Note 1) 0.001 to 9 fCLK/fC Clock-to-Corner Tempco 10 Output Voltage Range Output Offset Voltage 0.25 VOFFSET 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 kHz 100:1 VIN = VCOM = VDD / 2 VCOM = VDD / 2 (Note 2) THD+N AOS fIN = 200Hz, VIN = 4Vp-p, measurement bandwidth = 22kHz V 25 mV 0.2 0.4 dB dB +1 V/V Input, COM externally driven VDD - 0.5 2 VDD 2 VDD + 0.5 2 Output, COM internally driven VDD - 0.2 2 VDD 2 VDD + 0.2 2 V Measured with respect to COM RCOM Clock Feedthrough VDD - 0.25 4 -81 OS to OUT VCOM VOS 0 ppm/C 0.1 90 TA = +25C V 130 k 5 mVp-p Resistive Output Load Drive RL 10 1 k Maximum Capacitive Load at OUT CL 50 500 pF Input Leakage Current at COM SHDN = GND, VCOM = 0 to VDD 0.2 10 A Input Leakage Current at OS VOS = 0 to VDD 0.2 10 A 17.5 21.5 kHz 8 12.5 A CLOCK Internal Oscillator Frequency fOSC Clock Output Current (internal oscillator mode) ICLK Clock Input High VIH Clock Input Low VIL 2 COSC = 1000pF (Note 3) 13.5 4.5 _______________________________________________________________________________________ V 0.5 V 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters (VDD = +5V, filter output measured at OUT, 10k || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1F from COM to GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER CONDITIONS SYMBOL MIN TYP MAX UNITS POWER REQUIREMENTS Supply Voltage VDD Supply Current IDD 5.5 V Operating mode, no load 4.5 0.8 1.0 mA 1 Shutdown Current I SHDN SHDN = GND 0.2 Power-Supply Rejection Ratio PSRR Measured at DC 70 A dB SHUTDOWN SHDN Input High VSDH SHDN Input Low VSDL SHDN Input Leakage Current 4.5 V SHDN = 0 to VDD V 0.2 0.5 V 10 A ELECTRICAL CHARACTERISTICS--MAX7427 (VDD = +3V, filter output measured at OUT pin, 10k || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1F from COM to GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS FILTER CHARACTERISTICS Corner-Frequency Range Clock-to-Corner Ratio fC (Note 1) 0.001 to 12 fCLK/fC Clock-to-Corner Tempco 10 Output Voltage Range Output Offset Voltage 0.25 VOFFSET DC Insertion Gain with Output Offset Removed Total Harmonic Distortion plus Noise THD+N AOS COM Voltage Range VCOM Input Resistance at COM VIN = VCOM = VDD / 2 VCOM = VDD / 2 (Note 2) Offset Voltage Gain Input Voltage Range at OS kHz 100:1 VOS V 4 25 mV 0.2 0.4 dB fIN = 200Hz, VIN = 2.5Vp-p, measurement bandwidth = 22kHz -79 dB OS to OUT +1 V/V VDD - 0.1 2 Measured with respect to COM RCOM Clock Feedthrough 0 ppm/C VDD - 0.25 VDD 2 VDD + 0.1 2 V 0.1 V 90 130 k 3 mVp-p Resistance Output Load Drive RL TA = +25C 10 1 k Maximum Capacitive Load at OUT CL 50 500 pF Input Leakage Current at COM Input Leakage Current at OS SHDN = GND, VCOM = 0 to VDD VOS = 0 to VDD 0.2 10 A 0.2 10 A _______________________________________________________________________________________ 3 MAX7426/MAX7427 ELECTRICAL CHARACTERISTICS--MAX7426 (continued) MAX7426/MAX7427 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters ELECTRICAL CHARACTERISTICS--MAX7427 (continued) (VDD = +3V, filter output measured at OUT pin, 10k || 50pF load to GND at OUT, SHDN = VDD, OS = COM, 0.1F from COM to GND, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 13.5 17.5 21.5 kHz 7.5 12.5 A CLOCK Internal Oscillator Frequency fOSC COSC = 1000pF (Note 3) Clock Output Current (internal oscillator mode) ICLK VCLK = 0 or 3V Clock Input High VIH Clock Input Low VIL 2.5 V 0.5 V 3.6 V mA POWER REQUIREMENTS Supply Voltage Supply Current VDD IDD 2.7 Operating mode, no load 0.75 1.0 Shutdown Current I SHDN SHDN = GND 0.2 1 Power-Supply Rejection Ratio PSRR Measured at DC 70 A dB SHUTDOWN SHDN Input High VSDH SHDN Input Low VSDL SHDN Input Leakage Current 2.5 V SHDN = 0 to VDD V 0.2 0.5 V 10 A ELLIPTIC FILTER CHARACTERISTICS (r = 1.25) (VDD = +5V for MAX7426, VDD = +3V for MAX7427, filter output measured at OUT, 10k || 50pF load to GND at OUT, SHDN = VDD, VCOM = VOS = VDD / 2, fCLK = 100kHz, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 3) PARAMETER Insertion Gain with DC Gain Error Removed (Note 4) MIN TYP MAX fIN = 0.38fC CONDITIONS -0.4 -0.2 0.4 fIN = 0.68fC -0.4 0.2 0.4 fIN = 0.87fC -0.4 -0.2 0.4 fIN = 0.97fC -0.4 0.2 0.4 fIN = fC -0.7 -0.2 0.2 fIN = 1.25fC -38.5 -34 fIN = 1.43fC -37.2 -35 fIN = 3.25fC -37.2 -35 UNITS dB Note 1: The maximum fC is defined as the clock frequency fCLK = 100 fC at which the peak SINAD drops to 68dB with a sinusoidal input at 0.2fC. Note 2: DC insertion gain is defined as VOUT / VIN. Note 3: fOSC (kHz) 17.5 103 / COSC (COSC in pF). Note 4: The input frequencies, fIN, are selected at the peaks and troughs of the ideal elliptic frequency responses. 4 _______________________________________________________________________________________ 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters (VDD = +5V for MAX7426, VDD = +3V for MAX7427, fCLK = 100kHz, SHDN = VDD, VCOM = VOS = VDD / 2, TA = +25C, unless otherwise noted.) PASSBAND FREQUENCY RESPONSE GAIN (dB) -30 -0.2 -0.4 -40 -0.6 -50 -60 -0.8 -70 -1.0 1 2 3 4 fC = 1kHz r = 1.25 -150 -200 -250 -300 -350 -400 0 5 -100 INPUT FREQUENCY (kHz) 0.2 0.4 0.6 0.8 1.0 0 0.2 INPUT FREQUENCY (kHz) 0.4 0.6 0.8 1.0 1.2 INPUT FREQUENCY (kHz) SUPPLY CURRENT vs. SUPPLY VOLTAGE SUPPLY CURRENT vs. TEMPERATURE 0.88 MAX7426/27-07 0.82 0.86 0.84 SUPPLY CURRENT (mA) 0.80 0.78 0.76 0.74 MAX7426/27-08 0 SUPPLY CURRENT (mA) GAIN (dB) 0 -20 fC = 1kHz r = 1.25 -50 PHASE SHIFT (DEGREES) 0.2 -10 PHASE RESPONSE 0 MAX7426/27-04 MAX7426/27-02 fC = 1kHz r = 1.25 0 0.4 MAX7426/27-06 FREQUENCY RESPONSE 10 VDD = +5V 0.82 0.80 0.78 0.76 VDD = +3V 0.74 0.72 0.72 0.70 0.70 0.68 2.5 3.0 3.5 4.0 4.5 SUPPLY VOLTAGE (V) 5.0 5.5 -60 -40 -20 0 20 40 60 80 100 TEMPERATURE (C) _______________________________________________________________________________________ 5 MAX7426/MAX7427 Typical Operating Characteristics Typical Operating Characteristics (continued) (VDD = +5V for MAX7426, VDD = +3V for MAX7427, fCLK = 100kHz, SHDN = VDD, VCOM = VOS = VDD / 2, TA = +25C, unless otherwise noted.) 0 MAX7426/27-10 0 SEE TABLE 1. -10 -20 THD + NOISE (dB) -20 -30 -40 -50 -60 -70 SEE TABLE 1. -10 -30 -40 -50 -60 -70 B B -80 -80 A -90 0 1 2 A -90 3 4 0 5 0.5 1.0 1.5 2.0 2.5 AMPLITUDE (Vp-p) AMPLITUDE (Vp-p) Table 1. THD + Noise Test Conditions 6 MAX7426/27-12 MAX7427 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT SIGNAL AMPLITUDE MAX7426 TOTAL HARMONIC DISTORTION PLUS NOISE vs. INPUT SIGNAL AMPLITUDE THD + NOISE (dB) MAX7426/MAX7427 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters LABEL fIN (Hz) fC (kHz) fCLK (kHz) MEASUREMENT BANDWIDTH (kHz) A 200 1 100 22 B 1k 5 500 80 _______________________________________________________________________________________ 3.0 5th-Order, Lowpass, Elliptic, Switched-Capacitor (VDD = +5V for MAX7426, VDD = +3V for MAX7427, fCLK = 100kHz, SHDN = VDD, VCOM = VOS = VDD / 2, TA = +25C, unless otherwise noted.) INTERNAL OSCILLATOR PERIOD vs. LARGE CAPACITANCE (IN nF) INTERNAL OSCILLATOR PERIOD vs. SMALL CAPACITANCE (IN pF) 150 VDD = +3V 100 50 MAX7426/27-14 18 OSCILLATOR PERIOD (ms) VDD = +5V OSCILLATOR PERIOD (s) 20 MAX7426/27-13 200 VDD = +5V 16 14 12 VDD = +3V 10 8 6 4 2 0 0 500 100 150 200 250 300 350 CAPACITANCE (nF) INTERNAL OSCILLATOR FREQUENCY vs. SUPPLY VOLTAGE INTERNAL OSCILLATOR FREQUENCY vs. TEMPERATURE 17.3 17.2 MAX7426/27-16 MAX7426/27-15 17.4 18.0 VDD = +3V 17.6 VDD = +5V 17.2 16.8 16.4 COSC = 1000pF COSC = 1000pF 16.0 17.1 3.0 3.5 4.0 4.5 5.0 -40 5.5 -20 0 20 40 60 SUPPLY VOLTAGE (V) TEMPERATURE (C) DC OFFSET VOLTAGE vs. TEMPERATURE DC OFFSET VOLTAGE vs. SUPPLY VOLTAGE MAX7426/27-17 0 -0.5 -1.0 VDD = +3V -1.5 -2.0 -2.5 VDD = +5V -3.0 80 0 100 MAX7426/27-18 2.5 -0.5 DC OFFSET VOLTAGE (mV) 2.0 DC OFFSET VOLTAGE (mV) 50 CAPACITANCE (pF) 17.5 OSCILLATOR FREQUENCY (kHz) 0 1000 1500 2000 2500 3000 3500 OSCILLATOR FREQUENCY (kHz) 0 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -3.5 -40 -20 0 20 40 60 TEMPERATURE (C) 80 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 7 MAX7426/MAX7427 Typical Operating Characteristics (continued) 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters MAX7426/MAX7427 Pin Description PIN NAME FUNCTION Common Input Pin. Biased internally at midsupply. Bypass externally to GND with a 0.1F capacitor. To override internal biasing, drive with an external supply. 1 COM 2 IN 3 GND Ground 4 VDD Positive Supply Input, +5V for MAX7426 or +3V for MAX7427 5 OUT Filter Output 6 OS Offset Adjust Input. To adjust output offset, bias OS with a resistive voltage-divider between an external supply and ground. Connect OS to COM if no offset adjustment is needed. 7 SHDN Shutdown Input. Drive low to enable shutdown mode; drive high or connect to VDD for normal operation. 8 CLK Filter Input Clock Input. Connect an external capacitor (COSC) from CLK to GND to set the internal oscillator frequency. To override the internal oscillator, connect to an external clock. Detailed Description The MAX7426/MAX7427 family of 5th-order, elliptic, lowpass filters provides sharp rolloff with good stopband rejection. All parts operate with a 100:1 clock-tocorner frequency ratio. Most SCFs are designed with biquadratic sections. Each section implements two pole-zero pairs, and the sections can be cascaded to produce higher-order filters. The advantage to this approach is ease of design. However, this type of design is highly sensitive to component variations if any section's Q is high. The MAX7426/MAX7427 use an alternative approach, which is to emulate a passive network using switched-capacitor integrators with summing and scaling. The passive network may be synthesized using CAD programs or may be found in many filter books. Figure 1 shows a basic 5th-order ladder elliptic filter structure. A switched-capacitor filter that emulates a passive ladder filter retains many of the same advantages. The component sensitivity of a passive ladder filter is low when compared to a cascaded biquadratic design, because each component affects the entire filter shape rather than a single pole-zero pair. In other words, a RS + - VIN C1 C2 C4 L2 L4 C3 Elliptic Characteristics Lowpass elliptic filters such as the MAX7426/MAX7427 provide the steepest possible rolloff with frequency of the four most common filter types (Butterworth, Bessel, Chebyshev, and elliptic). The high Q value of the poles near the passband edge combined with the stopband zeros allow for the sharp attenuation characteristic of elliptic filters, making these devices ideal for anti-aliasing and post-DAC filtering in single-supply systems (see the Anti-Aliasing and Post-DAC Filtering section). In the frequency domain (Figure 2), the first transmission zero causes the filter's amplitude to drop to a minimum level. Beyond this zero, the response rises as the frequency increases until the next transmission zero. The stopband begins at the stopband frequency, fS. At frequencies above fS, the filter's gain does not exceed the gain at fS. The corner frequency, fC, is defined as the point where the filter output attenuation falls just below the passband ripple. The transition ratio (r) is defined as the ratio of the stopband frequency to the corner frequency: r = fS / fC The MAX7426/MAX7427 have a transition ratio of 1.25 and typically 37dB of stopband rejection. C5 Figure 1. 5th-Order Ladder Elliptic Filter Network 8 mismatched component in a biquadratic design has a concentrated error on its respective poles, while the same mismatch in a ladder filter design spreads its error over all poles. RL Clock Signal External Clock These SCFs are designed for use with external clocks that have a 40% to 60% duty cycle. When using an external clock, drive the CLK pin with a CMOS gate _______________________________________________________________________________________ 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters RIPPLE 0.1F VDD fC GAIN (dB) f TRANSITION RATIO = S fC INPUT IN SHDN OUT COM OUTPUT 0.1F fS 50k MAX7426 MAX7427 CLOCK CLK 50k OS 0.1F GND PASSBAND 50k STOPBAND fC FREQUENCY fS Figure 2. Elliptic Filter Response Figure 3. Offset Adjustment Circuit powered from 0 to VDD. Varying the rate of the external clock adjusts the corner frequency of the filter: Estimate the input impedance of the filter by using the following formula: f fC = CLK 100 Internal Clock When using the internal oscillator, the capacitance (COSC) on CLK determines the oscillator frequency: fOSC (kHz) = 17.5 x 103 COSC (pF) Since COSC is in the low picofarads, minimize the stray capacitance at CLK so that it does not affect the internal oscillator frequency. Varying the rate of the internal oscillator adjusts the filter's corner frequency by a 100:1 clock-to-corner frequency ratio. For example, an internal oscillator frequency of 100kHz produces a nominal corner frequency of 1kHz. Input Impedance vs. Clock Frequencies The MAX7426/MAX7427's input impedance is effectively that of a switched-capacitor resistor (see the following equation), and is inversely proportional to frequency. The input impedance values determined by the equation represent the average input impedance, since the input current is not continuous. As a rule, use a driver with an output resistance less than 10% of the filter's input impedance. ZIN = 1 fCLK x CIN where fCLK = clock frequency and CIN = 1pF. Low-Power Shutdown Mode The MAX7426/MAX7427 have a shutdown mode that is activated by driving SHDN low. In shutdown mode, the filter supply current reduces to 0.2A, and the output of the filter becomes high impedance. For normal operation, drive SHDN high or connect to VDD. Applications Information Offset (OS) and Common-Mode (COM) Input Adjustment COM sets the common-mode input voltage and is biased at midsupply with an internal resistor-divider. If the application does not require offset adjustment, connect OS to COM. For applications where offset adjustment is required, apply an external bias voltage through a resistor-divider network to OS, as shown in Figure 3. For applications that require DC level shifting, adjust OS with respect to COM. (Note: Do not leave OS unconnected.) The output voltage is represented by these equations: VOUT = (VIN - VCOM ) + VOS V VCOM = DD (typical) 2 where (VIN - VCOM) is lowpass filtered by the SCF and OS is added at the output stage. See the Electrical _______________________________________________________________________________________ 9 MAX7426/MAX7427 VSUPPLY MAX7426/MAX7427 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters For either single-supply or dual-supply operation, drive CLK and SHDN from GND (V- in dual-supply operation) to V DD . Use the MAX7427 for 2.5, and use the MAX7426 for 1.5V. For 5V dual-supply applications, refer to the MAX291/MAX292/MAX295/MAX296 and MAX293/MAX294/MAX297 data sheets. V+ VDD INPUT IN SHDN OUT COM * OUTPUT Input Signal Amplitude Range MAX7426 MAX7427 V+ CLOCK V- CLK OS 0.1F 0.1F The optimal input signal range is determined by observing the voltage level at which the signal-to-noise plus distortion (SINAD) ratio is maximized for a given corner frequency. The Typical Operating Characteristics show the THD + Noise response as the input signal's peak-topeak amplitude is varied. GND Anti-Aliasing and Post-DAC Filtering When using the MAX7426/MAX7427 for anti-aliasing or post-DAC filtering, synchronize the DAC (or ADC) and the filter clocks. If the clocks are not synchronized, beat frequencies may alias into the desired passband. V*CONNECT SHDN TO V- FOR LOW-POWER SHUTDOWN MODE. Harmonic Distortion Figure 4. Dual-Supply Operation Characteristics table for the input voltage range of COM and OS. Changing the voltage on COM or OS significantly from midsupply reduces the dynamic range. Power Supplies The MAX7426 operates from a single +5V supply, and the MAX7427 operates from a single +3V supply. Bypass VDD to GND with a 0.1F capacitor. If dual supplies are required, connect COM to the system ground and GND to the negative supply. Figure 4 shows an example of dual-supply operation. Singlesupply and dual-supply performance are equivalent. Harmonic distortion arises from nonlinearities within the filter. These nonlinearities generate harmonics when a pure sine wave is applied to the filter input. Table 2 lists typical harmonic distortion values with a 10k load at TA = +25C. Chip Information TRANSISTOR COUNT: 1457 PROCESS: BiCMOS Table 2. Typical Harmonic Distortion FILTER fCLK (kHz) fIN (Hz) 500 1k MAX7426 TYPICAL HARMONIC DISTORTION (dB) 2nd 3rd 4th 5th -71 -73 -90 -82 -88 -86 -92 -88 -87 -86 -90 -90 -90 -87 -90 -90 4 100 200 500 1k MAX7427 2 100 10 VIN (Vp-p) 200 ______________________________________________________________________________________ 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters 8LUMAXD.EPS ______________________________________________________________________________________ 11 MAX7426/MAX7427 ________________________________________________________Package Information MAX7426/MAX7427 5th-Order, Lowpass, Elliptic, Switched-Capacitor Filters PDIPN.EPS Package Information (continued) 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX7426CPA+ MAX7426CUA+ MAX7426CUA+T MAX7426EPA+ MAX7426EUA+T MAX7427CPA+ MAX7427CUA+ MAX7427CUA+T MAX7427EPA+ MAX7427EUA+T MAX7426EUA+ MAX7427EUA+