QPSK Encoder

The MC145750 is a silicon gate HCMOS device designed to encode π/4–shift

QPSK baseband signals. The device contains two 10–bit DACs for the I/Q signal, Root–Nyquist digital filtering, and burst rising and falling edge processing for digital RF communication equipment. Primary applications for this device are in products that will be used in PHS (384 kbps) and PDC (42 kbps). It will perform up to 800 kbps data rate. It also contains PN511 random pattern generator and timing generator with PLL.

• Root–Nyquist Digital Filtering (Coefficient = 0.5)

• Burst Edge Processing Circuitry (Ramp–Up and –Down)

• Two 10–Bit DACs for I/Q Output

• Operating Voltage Range: 2.7 to 5.5 V

• PN511 Random Pattern Generator

• Conformance to RCR Standard for PHS, PDC

• Variable Data Transmission Rate up to 800 kbps (VDD = 5 V)

• Timing Generator with PLL

• QPSK Mode, Burst, and Continuous I/Q Signal Output is Performed

• Companion Device is MRFIC0001