Product Overview

California Micro Devices introduces a new member of its Praetorian® ASIP™ (Application Specific Integrated Passive™) EMI (electromagnetic interference) inductor-based filter arrays family, offering outstanding filter performance combined with robust ESD (electrostatic discharge) protection. The CM1470 targets high speed data lines for high resolution imager interfaces in wireless handsets. In popular clamshell and slider phone configurations, the interface typically comprises a flexible printed circuit board which can be highly sensitive to EMI radiation. As sensor resolutions increase with new designs, the interface between the camera module and the host processor now operates at much higher data rate while demanding excellent signal integrity for optimal AC performance. Traditional EMI filters based on R-C (Resistor-Capacitor) architectures result in significant signal integrity degradation and are not a viable solution for filtering EMI efficiently while maintaining sharp rise and fall times. In order to address these requirements, California Micro Devices developed the ultra low capacitance CM1470 single chip inductor array by leveraging its Praetorian® process technology that allows the integration of spiral inductors with high levels of ESD protection in an industry leading 0.4mm pitch Chip Scale Package format.

Product Features
The CM1470 is a family of series inductor networks featuring ESD protection. In order to accommodate various interface configurations, it is available in 4, 6 and 8 channel versions. Each channel features an inductance of 18nH and a very low input capacitance of 3pF. The ESD diodes connected to the filter ports are designed and characterized to safely dissipate ESD strikes of ±2kV per Level 1 requirement of the IEC61000-4-2 international standard. Using the MIL-STD-883 (Method 3015) specification for Human Body Model (HBM) ESD, the pins are protected for contact discharges at greater than ±4kV.

The series inductor architecture results in minimum insertion loss, high cutoff frequency and therefore an excellent level of signal integrity is preserved on the data lines where the CM1470 is applied.

The CM1470 is housed in an industry leading ultra compact and very cost effective 0.4mm pitch Chip Scale Package (CSP) of 2.03mm x 0.836mm, 2.83mm x 0.836mm and 3.63mm x 0.836mm for the 4, 6 and 8 channel versions respectively.

Key features of the CM1470 family include:

Low channel capacitance, 3 pF typical OptiGuard Coating for improved reliability at assembly 4, 6 and 8 channels of inductive filtering ±2kV HBM – MIL-STD883 (Method 3015) ±4kV IEC61000-4-2, Level 1 Chip Scale Package (CSP) features extremely low parasitic inductance for optimum filter and ESD performance 10 bump, 2.030mm x 0.836mm footprint CSP for CM1470-04 14 bump, 2.830mm x 0.836mm footprint CSP for CM1470-06 18 bump, 3.630mm x 0.836mm footprint CSP for CM1470-08 Lead-free version available

Product Applications
The CM1470 is tailored for high speed data lines for high resolution imager interfaces in wireless handsets. Using the CM1470, mobile phone or camera module designers can now provide a high level of EMI filtering on their high speed interfaces without jeopardizing signal integrity. It is common for high resolution sensors to output data rates at 80Mbps, and host processor requirements in terms of input setup time can be as low as 2ns. In order to meet these requirements, the capacitance on the line must be minimized. As the CM1470 features minimum input capacitance, designers now have the flexibility to adjust filter performance and characteristics by tuning the capacitance on the flexible cable on each channel.

Sampling, Pricing and Availability

The CM1470 is currently sampling, and pricing starts at $0.34, $0.43 and $0.52 in 1,000 units for the 4, 6 and 8 channel configurations respectively. Production is scheduled for Q1 2006. The CM1470 is offered in standard and lead free CSP packages with CMD’s OptiGuard™ coating for increased robustness and durability.