u4255bm ATMEL Corporation, u4255bm Datasheet
u4255bm
Available stocks
Related parts for u4255bm
u4255bm Summary of contents
Page 1
... AM/FM Receiver IC Description The U4255BM is an integrated AM/FM front end circuit in BICMOS technology. It contains a double conversion system for FM and an up/down conversion circuit for AM (IF1 = 10.7 MHz, IF2 = 450 kHz). A complete automatically aligned high performance AM/FM tuner Features D FM-double conversion system D Integrated second IF filter with software controlled ...
Page 2
... U4255BM Pin Description MX1FMA 1 MX1FMB 2 MX1AMB 3 GNDMX 4 FMAGC 5 AMVREG 6 AMAGC 7 AMPLPF 8 METER 9 ADJAC 10 MPX 11 V57 12 OSCB 13 OSCE 14 GNDOSC 15 OSCOUT CLK 18 DATA 19 20 IF2OUT INT 21 MX2LO 22 14856 Figure 2. Pinning 2 (12) Pin Symbol 1 MX1FMA 1st mixer FM input A 2 MX1FMB 1st mixer FM input B ...
Page 3
... V Pin Pins 43 and 44 vo IP3 Pin 41 Pin 330 W Pins Pins 23 and IP3 R U4255BM Value Unit 10 800 mW 150 –40 to +85 –50 to +150 Value Unit 80 K/W Min. Typ. Max. 7.5 8.5 10 –40 +85 = 450 kHz, reference point Pin 4 IF Min ...
Page 4
... U4255BM Electrical Characteristics (continued) Test conditions (unless otherwise specified 100 MHz For AC parameters Parameters 2nd IF Amplifier (450 kHz) Input resistance IF preamplifier gain Preamplifier control range Oscillator (Pin 15, GND, connected to external oscillator components) Rg (Pin 13) = 220 W, Oscillator range Q of Losc = 70, ...
Page 5
... B87 B86 B85 B84 B83 B82 B81 BYTE 2 LSB Tk-fmzf FM AGC AM-AGC FM BW IF2 B66 B65 B64 B63 B62 B61 B60 U4255BM LSB BYTE 3 MSB IPD3 IPD1 OSCB 0 0 P–2 P–2 P–2 IPD4 IPD2 Status 0 Addr. MSB BYTE 1 Field BWmpx ...
Page 6
... U4255BM Bus Timing t R Enable Data Clock Bus Control The operating mode is set by the Bits 92 and 93 AM/FM/Weather Channel Bit 93 Standby Weather band 1 The Bits control gain of the FM IF amplifier Gain FM-IF Bit ...
Page 7
... Bit 80 Bit 67 sets the maximum reduction of the MPX signal level Max Value of Soft Mute 0 1 Temperature coefficient setting amplifier Temperature Coefficient Bit 79 (TC) of the IF amplifier 0 1 U4255BM Bit 78 Bit 77 Bit 76 Bit 75 Bit 74 Bit ...
Page 8
... U4255BM Level Control of the FM AGC threshold FM AGC Threshold Bit 65 103 dBmV 0 97 dBmV 1 92 dBmV 0 85 dBmV 1 Level Control of the AM AGC threshold AM AGC Threshold Bit 63 102 dBmV 0 105 dBmV 1 107 dBmV 0 108 dBmV 1 Bits 60 and 61 control the bandwidth of the 2nd mixer ...
Page 9
... VS V Bus V Rev. A1, 26-Jun-00 Test point 14906 Figure 5. Test circuit U4255BM 50 50 Pin Pin (12) ...
Page 10
... U4255BM Application Board Schematic 10 (12) Figure 6. Application board schematic Rev. A1, 26-Jun-00 ...
Page 11
... Package Information Package SSO44 Dimensions in mm 18.05 17.80 0.3 0.8 16 Rev. A1, 26-Jun-00 U4255BM 9.15 8.65 7.50 7.30 2.35 0.25 0.10 10.50 10.20 23 technical drawings according to DIN specifications 22 0.25 13040 11 (12) ...
Page 12
... U4255BM Ozone Depleting Substances Policy Statement It is the policy of TEMIC Semiconductor 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 ...