U4224B Datasheet | TEMIC Semiconductors

Time Code Receiver Description The U4224B is a bipolar integrated straight through receiver circuit in the frequency range of 40 to 80 k Hz. The device is designed for radio controlled clock applications. Features Very low power consumption Very high sensitivity High selectivity by using two crystal filters Power down mode available D Only a few external ponents necessary D Digitalized serial output signal D AGC hold mode Block Diagram PON GND VCC 3 1 15 Power Supply TCO 16 Decoder 93 7727 e 11 10 9 FLB FLA DEC 2 4 SB Q1A AGC Amplifier 5 6 13 14 Q2B Rectifier & Integrator 7 REC 8 INT Q1B Q2A TELEFUNKEN Semiconductors Rev. A3, 02-Apr-96 1 (17) Pin Description Pin SO 16 L 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VCC IN GND SB Q1A Q1B REC INT DEC FLA FLB SL Q2A Q2B PON TCO Supply voltage Amplifier - Input Ground Bandwidth control Crystal filter 1 Crystal filter 1 Rectifier output Integrator output Decoder input Low pass filter Low pass filter AGC hold mode Crystal filter 2 Crystal filter 2 Power ON/OFF control Time code output INT 8 93 7729 e Symbol Function 16 TCO 15 PON 14 Q2B 13 Q2A U4224B 12 SL 11 FLB 10 FLA 9 DEC IN 2 GND 3 SB 4 Q1A 5 Q1B 6 REC 7 A ferrite antenna is connected between IN and VCC. For high sensitivity the Q of the antenna circuit should be as high as possible, but a high Q often requires temperature pensation of the resonant frequency. Specifications are valid for Q > 30. An optimal signal to noise ratio will be achieved by a resonant resistance of 50 to 200 k W. A resistor RSB is connected between SB and GND. It controls the bandwidth of the crystal filters. It is remended: RSB = 0 W for DCF 77.5 k Hz, RSB = 10 k W for 60 k Hz WWVB and RSB = open for JG2AS 40 k Hz. 94 8381 SB IN...