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Product Detailed Parameters
- Description：IC FILTER 12KHZ LOWPASS 8UMAX
- Series：-
- Mfr：Analog Devices Inc./Maxim Integrated
- Package：Tube
- Filter Type：Elliptic, Low Pass Switched Capacitor
- Frequency - Cutoff or Center：12kHz
- Number of Filters：1
- Filter Order：5th
- Voltage - Supply：2.7V ~ 3.6V
- Mounting Type：Surface Mount
- Package / Case：8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Supplier Device Package：8-uMAX/uSOP
- Grade：-
- Qualification：-
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Overview
The MAX7427CUA+ is a 5th-order, lowpass, elliptic switched-capacitor filter operating from a single +3V supply. It draws 0.8mA in normal mode and 0.2µA in shutdown mode. The corner frequency ranges from 1Hz to 12kHz with a fixed transition ratio of 1.25 and typically 37dB stopband rejection. Key electrical parameters include ±4mV output offset voltage, -80dB THD + Noise, and a clock-to-corner frequency ratio of 100:1. It operates within a temperature range of 0°C to +70°C.
Feature Summary
- Provides sharp rolloff characteristics suitable for anti-aliasing and post-DAC filtering applications
- Features a low-power shutdown mode that significantly reduces supply current consumption
- Includes an offset-adjust pin for precise DC output level tuning
Applications
- ADC Anti-Aliasing
- Post-DAC Filtering
- Speech Processing
Procurement Notes
Verify the component matches the specific +3V supply requirement and 0°C to +70°C commercial temperature grade. Confirm the package type corresponds to the 8-pin µMAX format. Ensure the ordering suffix aligns with the intended environmental specifications before finalizing procurement orders.
Selection Notes
Select this device when a single +3V supply is available and tight stopband rejection is required. Compare against the MAX7426 if a +5V supply is preferred. Consider external clocking options if tighter cutoff-frequency control is needed compared to the internal oscillator configuration.
Part Context
This component belongs to the MAX7426/MAX7427 family of 5th-order, lowpass, elliptic, switched-capacitor filters. The MAX7427 variant is specifically designed for +3V operation, while the MAX7426 supports +5V supplies. Both share identical filter characteristics and package options.
Replacement Considerations
The MAX7426 serves as a functional substitute when system power rails support +5V instead of +3V. Other members of the MAX742x family may be considered if different temperature grades or package styles are required.
FAQ
How is the corner frequency determined?
The corner frequency is set by the clock signal, maintaining a fixed 100:1 clock-to-corner frequency ratio.
What is the purpose of the SHDN pin?
Driving the SHDN pin low activates a low-power shutdown mode, reducing supply current to 0.2µA.
Can the filter operate with dual supplies?
Yes, dual-supply operation is supported by connecting COM to system ground and GND to the negative supply.
