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SL3522NA1C Datasheet(PDF) 8 Page - Mitel Networks Corporation |
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SL3522NA1C Datasheet(HTML) 8 Page - Mitel Networks Corporation |
8 / 19 page 8 SL3522 A PRACTICAL APPLICATION FOR THE SL3522 AS A LOG/LIMITING AMPLIFIER The SL3522, with the RF Output-Buffer ENABLED, has a large limited RF Output level (0dBm on each of two RF Output pins (9 and10)) and a wide RF bandwidth (450MHz) in a small 28 pin Miniature Ceramic S.O package. As a result, there is a tendency for the device to become unstable unless care is used in the application. The PCB layout for a ”SL3522 DEMONSTRATION BOARD” in Fig. 11 has proved reliably stable. The PCB is a double layer Fibre epoxy board which uses SMDs where possible. A circuit diagram for the Demonstration PCB appears in Fig. 10. The following points should be noted when this application is realised practically:- 1) A wire needs to connect the two pads connected to pins 14 and 15 of the SL3522, to allow +5V to appear at both pins. 2) ALL the GND connections to the SL3522 are made through the PCB to a Ground plane on the bottom side. It is important to ensure that the impedance of each of these connections is kept to an absolute minimum to prevent instability. If these connections are achieved using through plated holes, it is recommended that they are filled with solder to lower their impedance. 3) The PCB is configured to accept SMA, SMB or SMC connectors for the RF input, RF Output and Video Output connections. These can be changed if necessary to an alternative type, but it is vital to ensure that the ground plane is solidly connected to the Guard Ring which surrounds the RF Output tracks. 4) The PCB is configured to accept a small surface mounting DC isolating BALUN transformer (e.g VANGUARD VE43666, available from Vanguard Electronics Company Inc, 1480 West 178th St. GARDENA, C.A. 90248, U.S.A. Tel:- U.S.A. (213) 323 – 4100) to couple a signal into the RF input connections (pins 27 and 28). It is NOT recommended to attempt operating the SL3522 with the RF Output Buffer enabled, WITHOUT using an input BALUN, although it may be possible, provided the input source impedance to both pins 27 and 28 remains balanced. The centre tap of the secondary winding of the transformer should be soldered to the small ground plane on the upper side of the PCB. 5) The RF Output connection to the PCB is from pin 9 of the SL3522 only, with pin 10 being terminated on the PCB using a 51 Ω resistor. It is important to ensure that both pin 9 and10 are terminated with equal impedances. 6) The RF Output Buffer can be enabled by soldering a link (LK) between pin 8 of the SL3522 and the adjacent guard track around the RF Output lines. Similarly, the buffer can be disabled by removing the same link. When the buffer is disabled, the following components can be omitted:- 1nF capacitors (C1, C2) 10nF capacitor (C8) 51 Ω resistor (R FO ) 7) The Slope (gain) and Offset of the Video Output can be adjusted using two 1k Ω trimmers, provision for which is included in the PCB layout. The plots in Fig. 12 to fig. 23 are typical of the performance of SL3522 devices used with the PCB layout detailed in Fig.11. Fig.10 SL3522 demonstration board circuit diagram +5V VCC VIDEO OUTPUT C5 OFFSET ADJUST VR0 1k 10n GAIN ADJUST VRG 1k 1n 1n 15 16 17 18 19 20 21 22 23 24 25 14 13 12 11 10 9 8 7 6 5 4 RF OUTPUT –5V VEE 10n 3 2 1 26 27 28 10n RF INPUT RT 1k5 10n VIDEO LOADING R 200 C 20p 10n 10n C4 C3 10n LK C1 C8 C2 C9 RFO 51 C7 C6 RVS 150 RO 1k RG 1k SL3522 |
Similar Part No. - SL3522NA1C |
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Similar Description - SL3522NA1C |
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