*>> edward mayaka* wrote : Hi, Anyone with an idea where I can get the above Integrated Circuit? Edward. ---------------------------------------------------------------- Edward, wooaa... thank you for reminding me of the 80's. :-)))) Your chip use seems to be a filter system. When you get it, build shields around the inductance/capacitance areas, else you may get frequencies drifts by a few KHz. ( BTW I feel bad I disposed a Hameg 10Mhz oscillscope a few years ago, wish had met skunks then, would have passed it on. ). *Chip Specs :* This is a read-only register of the receive data buffer. It should be read in response to an RXF IRQ FLAG being set to 1. Bit 7 is the msb. The interval between RXF interrupts varies from approximately 16µs to 22ms, depending on the position within the internal data processing sequence. The delta-sigma conversion process produces high frequency noise beyond the audio passband, most of which is removed by the on-chip analog filters. The remaining out-of-band noise can be attenuated using an off-chip low pass filter. For most applica- tions, a simple passive filter as show in Figure 7 can be used. Note that this circuit also serves to block the DC present at the outputs. Figure 8 gives an ex- ample of a filter which can be used in applications where greater out of band attenuation is desired. The 2-pole Butterworth filter has a -3 dB frequency of 50 kHz, a passband attenuation of 0.1 dB at 20 kHz providing optimal out-of-band filtering for sample rates from 44.1 kHz to 96 kHz. The filter has and a gain of 1.56 providing a 2 Vrms output signal. Data Inputs / Outputs - Registered on the rising edge of CK during write operations. Driven from the rising edge of CK during read operations. DQa - indicates Data Byte aDQb - indicates Data Byte b DQc - indicates Data Byte cDQd - indicates Data Byte d DQe - indicates Data Byte eDQf - indicates Data Byte f DQg - indicates Data Byte gDQh - indicates Data Byte h. Manufactured with Skyworks Heterojunction Bipolar Transistor (HBT) process, a single Gallium Arsenide (GaAs) Monolithic Microwave Integrated Circuit (MMIC) contains all the active RF, interstage, and input matching circuits within the module. A CMOS IC controls the GaAs MMIC by supplying integrated bias controls for the driver and the final amplifier stages based on the voltage applied to the external pin, VCONT. An enable circuit will power-down the module when the voltage on the low current VENABLE pin is set low. The output match, realized within the module package, optimizes efficiency/linearity at maximum rated output power.