Milpitas, Calif. California Micro Devices has developed a new family of packaged Centurion Application Specific Integrated Passive (ASIP) electromagnetic interference (EMI) filter arrays that feature high-performance EMI filtering and electrostatic discharge (ESD) protection in a small 0.4-mm pitch TDFN package, which is about a 42% space savings compared to existing 0.5-mm pitch TDFN packages.
The Centurion CM1430 and CM1431 use C-R-C pi filters with capacitance values of 8.5 pF-100Ω-8.5 pF and 15 pF-100Ω-15 pF, respectively, corresponding to cutoff frequencies of 200 MHz and 120 MHz. The high cutoff frequencies make these products suitable for filtering high resolution display and camera modules interfaces, which utilize data rates up to 80 Mbits/s.
In addition, the CM1430 and CM1431 achieve attenuation of -25 dB and -35 dB, respectively, at 1 GHz. The attenuation of both parts is -35 dB at 3 GHz. The company noted that with the adoption of higher resolution color displays and camera imagers transitioning to the handset market, there is a growing need for EMI filters with higher cutoff frequencies and greater attenuation performance at the frequency band of 800 MHz to 3.0 GHz in small packages. Click here for the CM1430 datasheet.
Both products feature flow through routing for each filter channel which contributes to enhanced filter performance and ease of printed circuit board (PCB) layout, said the company, and superior filter performance across all channels is achieved through the large area ground pad on the bottom of the TDFN package that minimizes parasitic inductance. Both products also provide ESD protection up to ±15kV contact discharge per IEC61000-4-2 Level 4 specification. The Centurion CM1430 and CM1431 are both available in 4-, 6- and 8-channel configurations. Click here for the CM1431 datasheet.
To address space-constrained handset designs, California Micro Devices has worked closely with its assembly partners to develop a more space efficient, low profile 0.4-mm TDFN package. The 4-channel version with package dimensions of 1.7 mm x 1.35 mm (8 leads) requires 42% less board space, while the 6-channel and 8-channel versions in a package size of 2. 5 mm x 1.35 mm (12 leads), and 3.3 mm x 1.35 mm (16 leads), respectively, saves about 30% in board space. Each of these packages is available in a lead-free finish.
Samples of the Centurion CM1430 and CM1431 are available now. Sample pricing ranges between $0.42 and $0.59 each in quantities of 1,000, depending on the channel configuration. Production for both families is scheduled for third quarter 2005.
California Micro Devices, 1-408-934-3108, www.calmicro.com