PDF U2510B Data sheet ( Hoja de datos )

Número de pieza	U2510B
Descripción	All-Band AM/FM Receiver and Audio Amplifier
Fabricantes	ATMEL Corporation
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No Preview Available ! U2510B All-Band AM/FM Receiver and Audio Amplifier Description The U2510B is an integrated bipolar one-chip AM/FM radio circuit. It contains an FM front end with preamplifier, FM IF and demodulator, a complete AM receiver, an AF amplifier and a mode switch for AM, FM and tape. This circuit is designed for clock radios and portable radio-cassette recorders. Features D Superior FM strong signal behavior by using RF AGC D Soft mute and HCC for decreasing interstation noise in FM mode D Excellent AFC performance (level controlled, both polarities available) D Level indicator (LED drive) for AM and FM D DC mode control: AM, FM and tape D Wide supply-voltage range and low quiescent current D High AF output power: 1 W D Electronic volume control D Electronic AF bandwidth control (treble and high cut) D Output stage for headphone and speaker drive Block Diagram FM ant. FM RF tank FM osc. tank 987 IF BPE 6 14 16 (Replaceable) VS 2 26 28 FM RF BPE AGC AM ant. AM osc. tank AFC 12 FM front end FM IF amp. FM discr. 11 10 5 VRef AFC FM control AGC AM IF AM front end RF AGC amp. and detect. IF IF AGC AM Voltage stab. AM/FM AGC and mode control Level indic. 15 21 13 20 19 1 22 27 Power amp. 3 25 23 24 AF preamp. Volume 4 Mute HCC 18 AM S2 FM Tape VS AFC mode LED VS Figure 1. Block diagram Treble Vol 13912 Rev. A3, 23-Feb-01 1 (15) 1 page U2510B Electrical Characteristics (continued) VS = 6 V, Tamb = 25°C, test circuit (figure 16), unless otherwise specified Parameters Test Conditions / Pins Symbol Min. AM rejection ratio m = 30% AMRR RF sensitivity (S+N)/N = 26 dB (S+N)/N = 46 dB Vi2 Vi2 Limiting threshold (-3 dB) Vi2 Mute voltage Test point: Mute Vi2 = 0 Vi2 = 60 dBmV Vmute Vmute Mute depth Referred to V0 at Vi2 = 0 S6 = A S6 = C MD MD AFC holding range fOSC > fin, S3 = A, S6 = A Vi2 x 10 dBmV Vi2 = 20 dBmV Vi2 = 80 dBmV FHR FHR FHR LED current Oscillator voltage eZload = 2.5 kW Pin 7 ILED VOSC AM section Vi1 = 60 dBmV, fi1 = 1.6 MHz, fm = 1 kHz, m = 30%, fiIF = 455 kHz, AF measuring range: 300 Hz to 20 kHz, (S2 = AM, S1 = B, test point: VD) AM front end voltage gain GVAM = 20 log (ViIF/Vi1) Vi1 = 20 dBmV, S1 = A GVAM Recovered audio voltage VD af1 Detector output resistance Detector output distortion Pin 23 Vi1 = 60 dBmV Vi1 = 105 dBmV RDo THD THD RF sensitivity AGC figure of merit referred to VD af (S+N)/N= 10 dB (S+N)/N= 26 dB (S+N)/N= 46 dB Vi1 = 105 dBmV, voltage drop (VD af) = –10 dB Vi1 Vi1 Vi1 FOM IF input resistance Pin 16 Zi LED current ILED Oscillator voltage Pin 5 VOSC Typ. 25 9 22 3 1.8 0.4 26 20 no AFC " 180 " 220 5.5 180 25 70 7.5 1 3 0 16 35 100 3.1 5.5 160 Max. Unit dB dBmV dBmV dBmV V V dB dB kHz kHz mA mV dB mV kW % % dBmV dBmV dBmV dB kW mA mV Rev. A3, 23-Feb-01 5 (15) 5 Page U2510B The alignment of the LC-discriminator circuit should be done with little or no effect on the AFC function. This can be realized by: – switching Pin 21 to open-circuit – connecting Pin 1 to a voltage source of 2 V – using a low signal level for alignment. In general, ceramic discriminator devices can be used, too. In this case, the effect of unavoidable spreads in the frequency characteristics of these case ceramic devices in conjunction with the IC characteristic has to be consid- ered. For example, mismatches of the characteristics between selectivity block and FM discriminator will lead to an increased signal-to-noise ratio at low signal level as well as to a higher demodulation distortion level or to an asymmetrical AFC. Application Circuits Antenna FM AM L3 C16 33 pF C2 2 pF C18 C17 33 pF 33 pF L4 C3 22 pF L1 L2 C4 27 pF T2 C7 C6 4.7 µF 22 nF AM IFT T1 455 kHz CF1 14 13 12 11 10 9876 U2510B 5 C5 Volume 6 pF P1 50 kΩ T4 C25 100 pF C8 4.7 µF 43 C24 18 pF 21 15 16 17 18 19 20 21 22 23 24 25 26 27 28 R1 390 Ω CF2 10.7 MHz C9 10 nF C15 220 µF 100 nF S2 AM FM C10 C11 4.7 µF 10 nF C14 C12 C13 4.7 µF 470 µF Z=8Ω Figure 17. Application circuit (low cost) S1 VS 13915 Rev. A3, 23-Feb-01 11 (15) 11 Page

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