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ML3356 Datasheet(PDF) 4 Page - LANSDALE Semiconductor Inc. |
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ML3356 Datasheet(HTML) 4 Page - LANSDALE Semiconductor Inc. |
4 / 9 page www.lansdale.com Page 4 of 9 Issue A LANSDALE Semiconductor, Inc. ML3356 Figure 5. Application with Fixed Bias on Data Shaper 1 ML3356 RF In 1:2 0.01 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 23 15 pF 5.6 pF Data Out 5.0 V 18 k 10 k 390 k 10 k Car. Det. Out 0 V or 4.0 V 3.3 k 130 k 3.0 k 0.1 3.3 k 470 pF 15 k 18 k 150 pF 5.0 V + 5.0 to + 12 V 0.01 fO Bead 4.0 V 180 0.01 82 0.1 Cer. Fil. 10.7 MHz 330 0.01 0.01 0.01 Bead 0.1 RF Input Ground Data Output Comp(+) Comp(–) Squelch Status Squelch Control Demod Out Demod Filter Quad Input RF Gnd OSC EM. OSC COL. RF VCC Mixer Out VCC Limiter Input Limiter Bias Limiter Bias Quad Bias 330 APPLICATION NOTES (continued) Shielding, which includes the placement of input and output components, is important in minimizing electrostatic or elec- tromagnetic coupling. The ML3356 has its pin connections such that the circuit designer can place the critical input and output circuits on opposite ends of the chip. Shielding is nor- mally required for inductors in tuned circuits. The ML3356 has a separate VCC and ground for the RF and IF sections which allows good external circuit isolation by minimizing common ground paths. Note that the circuits of Figures 1 and 2 have RF, Oscillator, and IF circuits predominantly referenced to the plus supply rails. Figure 5, on the other hand, shows a suitable means of ground referencing. The two methods produce identical results when carefully executed. It is important to treat Pin 19 as a ground node for either approach. The RF input should be ‘‘grounded’’ to Pin 1 and then the input and the mixer/oscilla- tor grounds (or RF VCC bypasses) should be connected by a low inductance path to Pin 19. IF and detector sections should also have their bypasses returned by a separate path to Pin 19. VCC and RF VCC can be decoupled to minimize feedback, although the configuration of Figure 2 shows a successful implementation on a common 5.0 V supply. Once again, the message is: define a supply node and a ground node and return each section to those nodes by separate, low impedance paths. The test circuit of Figure 2 has a 3 dB limiting level of 30 µV which can be lowered 6 db by a 1:2 untuned transformer at the input as shown in Figures 5 and 6. For applications that require additional sensitivity, an RF amplifier can be added, but with no greater than 20 db gain. This will give a 2.0 to 2.5 µV sensitivity and any additional gain will reduce receiver dynamic range without improving its sensitivity. Although the test circuit operates at 5.0 V, the mixer/oscillator optimum per- formance is at 8.0 V to 12 V. A minimum of 8.0 V is recom- mended in high frequency applications (above 150 MHz), or in PLL applications where the oscillator drives a prescaler. Legacy Applications Information |
Número de pieza similar - ML3356_08 |
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Descripción similar - ML3356_08 |
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