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LMF380CIN Datasheet(PDF) 5 Page - National Semiconductor (TI) |
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LMF380CIN Datasheet(HTML) 5 Page - National Semiconductor (TI) |
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5 / 12 page  Connection Diagrams Dual-In-Line Package TLH11123 – 2 Top View Order Number LMF380CIJ LMF380CMJ or LMF380CIN See NS Package Number J16A or N16E Plastic Chip Carrier Package TLH11123 – 3 Top View Order Number LMF380CIV See NS Package Number V20A Pin Description GND This is the analog ground reference for the LMF380 In split supply applications GND should be connected to the system ground When operating the LMF380 from a single positive power supply voltage pin 1 should be connected to a ‘‘clean’’ reference volt- age midway between Va and Vb NC These pins are not connected to the inter- nal circuitry OUT1 OUT2 These are the outputs of the filters OUT3 XTAL1 This is the crystal oscillator input pin When using the internal oscillator the crystal should be tied between XTAL1 and XTAL2 XTAL1 also serves as the input for an exter- nal CMOS-level clock XTAL2 This is the output of the internal crystal oscillator When using the internal oscilla- tor the crystal should be tied between XTAL1 and XTAL2 Vb This is the negative power supply pin It should be bypassed with at least a 01 mF ceramic capacitor For best results a 10 mF to 100 mF tantalum capacitor should also be used For single-supply op- eration connect this pin to system ground CLOCK OUT This is the clock output pin It can drive the clock inputs (XTAL1) of additional LMF380s or other components The clock output fre- quency is one-half the clock frequency at XTAL1 INPUT1 These are the signal inputs to the filters INPUT2 INPUT3 Va This is the positive power supply pin It should be bypassed with at least a 01 mF ceramic capacitor For best results a 10 m F to 100 mF tantalum capacitor should also be used Functional Description The LMF380 contains three fourth-order Chebyshev band- pass filters whose center frequencies are spaced one-third of an octave apart making it ideal for use in ‘‘real time’’ audio spectrum analysis applications As with other switched-capacitor filters the center frequencies are pro- portional to the clock frequency applied to the IC the center frequencies of the LMF380’s three filters are located at fCLK 50 fCLK 625 and fCLK 80 The three filters in an LMF380 cover a full octave in fre- quency so that by using several LMF380s with clock fre- quencies separated by a factor of 2n a complex audio pro- gram can be analyzed for frequency content over a range of several octaves To facilitate this the CLK OUT pin of the LMF380 supplies an output clock signal whose frequency is one-half that of the incoming clock frequency Therefore a single clock source can provide the clock reference for all of the 30 filters (10LMF380s) in a real time analyzer that cov- ers the entire 10-octave audio frequency range The LMF380 contains an internal clock oscillator that requires an external crystal and two capacitors to operate Since the clock divider is on-board only a single crystal is needed for the top-octave filter chip the remaining devices can derive their clock signals from the master If desired an external oscillator can be used instead Figure 1 shows the magnitude versus frequency curves for the three filters in the LMF380 Separate input and output pins are provided for the three internal filters The input pins will normally be connected to a common signal source but can also be connected to separate input signals when nec- essary TLH11123 – 6 FIGURE 1 Response curves for the three filters in the LMF380 The clock frequency is 250 kHz 5 |
Similar Part No. - LMF380CIN |
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Similar Description - LMF380CIN |
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