msm7557 Oki Semiconductor, msm7557 Datasheet - Page 20

• Manufacturer Part Number: msm7557
• Description: Single Chip Msk Modem With Compandor For Cordless Telephone
• Manufacturer: Oki Semiconductor

¡ Semiconductor
RCK2 is digital "1", the filter characteristics change 0.972 times on the frequency axis. (pass-band
becomes narrow) When RCK1 is digital "1" and RCK2 is digital "1", the filter characteristics change
1.029 times on the frequency axis. (pass-band becomes wide)
MSM7557 Filter Characteristics
MSM7557 has wide band filters (0.3 kHz to 3.4 kHz) as follows.
Fig. 4 to Fig. 10 show the filter characteristics when RCK2 is digital "0". When RCK1 is digital "0" and
Pre-Emphasis ........................................................................................................ Fig. 4
Splatter Filter ........................................................................................................ Fig. 5
RBPF ....................................................................................................................... Fig. 6
De-Emphasis ......................................................................................................... Fig. 7
Transmit Total (HPF1 + Pre-Emphasis + Splatter) ......................................... Fig. 8
Receive Total (RBPF + De-Emphasis) ............................................................... Fig. 9
Transmit and Receive Total ................................................................................ Fig. 10
MSM7557
20/25