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U4224B-CFL Datasheet(PDF) 2 Page - TEMIC Semiconductors |
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U4224B-CFL Datasheet(HTML) 2 Page - TEMIC Semiconductors |
2 / 17 page U4224B TELEFUNKEN Semiconductors Rev. A3, 02-Apr-96 2 (17) Pin Description Pin Symbol Function SO 16 L 1 VCC Supply voltage 2 IN Amplifier – Input 3 GND Ground 4 SB Bandwidth control 5 Q1A Crystal filter 1 6 Q1B Crystal filter 1 7 REC Rectifier output 8 INT Integrator output 9 DEC Decoder input 10 FLA Low pass filter 11 FLB Low pass filter 12 SL AGC hold mode 13 Q2A Crystal filter 2 14 Q2B Crystal filter 2 15 PON Power ON/OFF control 16 TCO Time code output 3 4 5 2 1 6 7 8 VCC IN GND SB TCO PON 15 14 16 13 12 11 10 9 DEC 93 7729 e U4224B Q1A Q1B REC INT Q2B Q2A SL FLB FLA IN 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 compensation 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. IN VCC 94 8379 SB A resistor RSB is connected between SB and GND. It con- trols the bandwidth of the crystal filters. It is recommended: RSB = 0 W for DCF 77.5 kHz, RSB = 10 k W for 60 kHz WWVB and RSB = open for JG2AS 40 kHz. SB GND 94 8381 |
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