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| LESHAN RADIO COMPANY, LTD. VHF variable capacitance diode FEATURES * High linearity * Excellent matching to 2% DMA * Ultra small plastic SMD package * C25: 2.75 pF; ratio: 11 * Low series resistance. APPLICATIONS * Electronic tuning in VHF television tuners. * Voltage controlled oscillators (VCO). DESCRIPTION The BB187 is a planar technology variable capacitance diode, in a SOD523 (SC-79) package. The excellent matching performance is achieved by gliding matching and a direct matching assembly procedure. 1 CATHODE 2 ANODE BB 187 1 2 SOD523 SC-79 MARKING CODE:X X MAX. 32 35 20 +150 +125 UNIT V V mA C C MAX. - - - - - - - TYP. 10 200 0.75 34.2 2.92 - 2 % nA nA pF pF 1 2 LIMITING VALUES In accordance with the Absolute Maximum Rating System (IEC 134). SYMBOL VR V RM IF T stg Tj PARAMETER continuous reverse voltage peak reverse voltage continuous forward current storage temperature operating junction temperature CONDITIONS in series with a 10 k resistor MIN. - - - -55 -55 ELECTRICAL CHARACTERISTICS T j =25C unless otherwise specified. SYMBOL IR rs Cd C d(2V) C d(25V) C d Cd PARAMETER reverse current diode series resistance diode capacitance CONDITIONS V R = 30 V; see Fig.2 V R = 30 V; T j =85C; see Fig.2 f = 470 MHz; V R = 5V V R = 2 V; f = 1 MHz; see Figs 1and 3 V R = 25 V; f = 1 MHz; see Figs 1and 3 capacitance ratio capacitance matching f = 1 MHz V R = 2 to 25 V; in a sequence of 15 diodes(gliding) MIN. - - - 29.3 2.57 11 - UNIT BB187-1/2 LESHAN RADIO COMPANY, LTD. BB 187 50 40 C d ( pF ) 30 20 f = 1 MHz; T j =25C 10 0 10 -1 1 10 10 2 V R( V ) Fig.1 Diode capacitance as a function of reverse voltage; typical values. 10 3 10 -3 I R (nA) 10 0 50 100 10 -5 10 -1 1 10 10 2 T j ( C ) TC d ( K -1 ) 10 2 10 -4 V R( V ) Fig.2 Reverse current as a function of junction temperature; maximum values. Fig.3 Temperature coefficient of diode capacitance as a function of reverse voltage; typical values. BB187-2/2 |
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