Proliferation of digital portable electronic equipment has created a noisy environment in which all devices become susceptible to Electromagnetic Interference (EMI). Interference form cell phone frequencies of 800-900 MHz and 1.9GHz as well as the growing wireless LAN frequencies of 2.4-6GHz can couple into the audio port of a handheld device and adversely affect its performance. FCC Part 15 sets maximum allowable emission and immunity levels for all digital devices.
LX7206 is an integrated low pass filter with ESD protection that filters out the undesired frequencies as well as protecting the port against both positive and negative ESD voltages. The device is a 3x2 array flip chip and measures 1.5 x 1.0 x 0.65 mm. The small size and profile of this device is ideally suited for portable applications. The absence of leadframe and bondwires minimizes inductance and optimizes the high frequency filter performance.
LX7206 exceeds the requirements of IEC61000-4-2 (15KV air discharge and 8KV contact discharge).

*Flip Chip construction
*Bi-directional EMI/RFI low-pass filter
*ESD protection with integrated line termination resistor
*Bi-directional TVS protects against negative ESD voltages in audio applications
*Low TVS operating voltage (5.0V)
*Low leakage current
*0.5mm Pitch Chip Scale Package designed for direct assembly on FR4 PCB using conventional assembly techniques

*Cell phones and Accessories
*Personal Digital Assistants (PDA’s)
*MP3 Players
*Desktops and Notebook Computers
*Digital Camcorders


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The WM8951L is a low power stereo ADC with an integrated microphone interface and crystal oscillator for clock generation. The WM8951L is ideal for voice recorders, wireless microphones and games console accessories.
Stereo line and mono microphone level audio inputs are provided, along with a mute function, programmable line level volume control and a bias voltage output suitable for an electret type microphone.
Stereo 24-bit multi-bit sigma delta ADCs are used with oversampling decimation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported.
The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including volume controls, mutes and extensive power management facilities. The device is available in a small 28 lead 5x5mm quad flat leadless package (QFN).

*Audio Performance
- ADC SNR 90dB (‘A’ weighted) at 3.3V, 85dB at 1.8V
- Low Power
- 1.42 – 3.6V Digital Supply Operation
- 1.8 – 3.6V Analogue Supply Operation
*Sampling Frequency: 8kHz – 96kHz
*Selectable ADC High Pass Filter
*2 or 3-Wire MPU Serial Control Interface
*Programmable Audio Data Interface Modes
- I2S, Left, Right Justified or DSP
- 16/20/24/32 bit Word Lengths
- Master or Slave Clocking Mode
*Microphone Input and Electret Bias with Side Tone Mixer
*Available in 5x5mm 28-lead QFN package

*Wireless microphones
*Voice recorders
*Games console accessories


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