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| Ordering number : ENN*7871 a LA2787 D w w Overview . w aS t ee h 4U t om .c Monolithic Linear IC Dolby Pro Logic Surround Decoder The LA2787 is a Dolby Pro Logic Surround decoder. Functions * High-performance matrix. * Wide dynamic range. * Low distortion factor. * Full bypass mode. * Digital auto balance. * Digital noise sequencer. * Center trim external input. * L+R+C mix output. Specifications Maximum Ratings at Ta = 25C Parameter Maximum power supply voltage Allowable power dissipation Operating ambient temperature Storage ambient temperature Symbol VCC max Pd max Topr Tstg Operating Conditions at Ta = 25C Parameter Recommended supply voltage Allowable operating voltage range Dolby level Input "H" level voltage Input "L" level voltage w w w t a .D Symbol VCC VCC range VO Dolby VIH VIL Ta 70C S a e h U t4 e .c m o Conditions Ratings 12 900 -20 to +70 -40 to +150 Unit V mW C C Conditions Ratings 9 8.5 to 10 300 3.5 to 5.5 0 to 1.0 Unit V V mVrms V V When Dolby Pro Logic surround is ON w w w .D a aS t ee h 4U t om .c 52504 JO IM No.7871-1/3 LA2787 Electrical Characteristics at Ta = 25C, VCC = 9V, VI = 1kHz L, Lt = 300mV R, Rt = 300mV C, S, Lt = Rt = 300mV*0.707 S Lt, Rt Unless reverse phase is specified, it is Pro Logic ON mode (wide mode) Parameter Current dissipation Cch output level Output level variation Lch matrix rejection Cch matrix rejection Rch matrix rejection Sch matrix rejection Lch distortion factor Cch distortion factor Rch distortion factor Sch distortion factor Lch S/N Cch S/N Rch S/N Sch S/N Lch signal handling Cch signal handling Rch signal handling Sch signal handling Noise sequencer output level Lch/Rch distortion factor when Pro Logic is OFF Lch/Rch S/N when Pro Logic is OFF When C trim is -15dB When C trim is -31dB Symbol ICCO VCO VAC RjL RjC RjR RjS THDL THDC THDR THDS S/N, L S/N, C S/N, R S/N, S SH, L SH, C SH, R SH, S Vns THD off S/N off CTRIM1 CTRIM2 Cch output reference Lch input Cch input Rch input Sch input Lch output Cch output Rch output Sch output CCIR/ARM, Rg = 10k CCIR/ARM, Rg = 10k CCIR/ARM, Rg = 10k CCIR/ARM, Rg = 10k VCC = 8.5V, THD = 1% VCC = 8.5V, THD = 1% VCC = 8.5V, THD = 1% VCC = 8.5V, THD = 1% Each channel output 20 to 20kHz B.P.F CCIR/ARM, Rg = 10k When setting -15dB When setting -31dB 75 -16 -32 70 70 70 67 15 15 15 15 50 No signal -2 -0.5 25 25 25 25 Conditions Ratings min typ 65 0 0 40 40 40 40 0.03 0.03 0.03 0.03 79 80 79 77 16 19 16 18 70 0.01 92 -15 -31 -14 -30 90 0.03 0.09 0.09 0.09 0.09 max 85 +2 +0.5 Unit mA dB dB dB dB dB dB % % % % dB dB dB dB dB dB dB dB mV % dB dB dB Package Dimensions unit : mm 3149A No.7871-2/3 LA2787 PS No.7871-3/3 |
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