DW9255/IG/LC1S

The DW9255 is a Surface Acoustic Wave (SAW) band pass filter for use with Zarlink Semiconductor's GP2000 Global Positioning System (GPS) receiver chip-set. The GP2000 GPS chip set from Zarlink Semiconductor comprises the GP2010 and GP2015 RF front end ICs along with the GP2021 12-channel GPS correlator. It is pre-tuned to the exact 2nd IF filter requirements of the Zarlink GP2010 & GP2015 RF front-end devices, with a center-frequency of 35.42MHz. The response is tuned for a flat passband, steep stopband and uniform passband group-delay with 3 external inductors. The device is realized on a Lithium Tantalite substrate and housed in a small leadless ceramic Surface Mount package.
The DW9255 gives significant improvement in correlated GPS Signal-to-Noise Ratio (SNR) performance compared to conventional LC band pass filter schemes. This aids satellite signal acquisition and tracking capability from the Zarlink GP2000 GPS chip-set. This device effectively filters out-of-band (unwanted) noise in the GPS signal. The Automatic Gain Control (AGC) within the Zarlink GP2010 and GP2015 RF Front-end devices will then operate only on in-band noise for optimum gain and superior correlated GPS signal strength.
FEATURES
Operates With Zarlink GP2010 and GP2015 RF Front End ICs
Centre Frequency of 35.42MHz
Insertion Loss of 17dB ±1dB (typical)
1dB Bandwidth 1.9MHz (typical)
Passband Ripple 0.8dB (typical)
Low Profile Ceramic Surface Mount Package
Operating Temperature Range -40° to +85°C APPLICATION
Commercial Global Positioning