U4276B TEMIC Semiconductors, U4276B Datasheet
U4276B
Related parts for U4276B
U4276B Summary of contents
Page 1
... FM Multipath Noise Cancellation Description The U4276B is a bipolar integrated multipath noise cancellation circuit designed for high performance car radio applications. Features D Preparation of the fieldstrength signal D Multipath noise cancellation Block Diagram 2 FSIN 1 AVFS 4 MPXIN 95 10619 Pin Description Pin Symbol 1 AVFS ...
Page 2
... U4276B FSIN / BFSOUT BFSOUT FSIN All information about reception conditions is derived from the fieldstrength signal. The fieldstrength signal at FSIN is initially buffered so as not to impair the character- istics of the IF IC and is available at BFSOUT. AVFS AVFS 94 8648 The fieldstrength signal at buffer output BFSOUT is aver- aged over time and applied to input AVFS via an RC low-pass filter with a large time constant ...
Page 3
... Acoustically relevant multipath interference, since it re- quires a short reaction time, is suppressed directly by the circuit via a Multipath Noise Cancellation (MNC) func- tion. The U4276B can be used both in conventional receivers and in receivers with digital signal processing. The following demands are placed on the field strength output of the IF amplifier: MPX in FM – ...
Page 4
... U4276B In order to achieve best performance, the MNC-circuit has to be adapted well to the fieldstrength output of the IF-IC. This can be done by adjustment of the DC-level at Field strength Mute 2 1. (8) Preliminary Information Figure 2. Pin Mute (R2/R3, see figure 4) in the range of V/2 The principle behaviour is shown in figure 3. ...
Page 5
... V ESD Symbol R thJA Symbol Min. Pin Pin Pin Pin out Pin 7 BW 100 Pin U4276B Value Unit 10 V t.b.d. mA – –55 to +150 C 125 C 2000 V Maximum Unit t.b.d. K/W Typ. Max. Unit 8 5.0 V ...
Page 6
... U4276B Parameters Test conditions / Pins Multipath Noise Cancellation MPX input voltage MPX output voltage THD MPXIN Bandwidth Mute-depth Gain Mute Input voltage low high Application Circuit FSIN AVFS ...
Page 7
... Ordering Information Extended type number U4276B-AFP U4276B-AFPG3 Dimensions in mm TELEFUNKEN Semiconductors Rev. A1, 05-Sep-96 Preliminary Information Package SO8 plastic SO8 plastic 94 8862 U4276B Remarks Taping according to IEC-286-3 7 (8) ...
Page 8
... U4276B Ozone Depleting Substances Policy Statement It is the policy of TEMIC TELEFUNKEN microelectronic GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment ...