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OQ2538U Datasheet(PDF) 7 Page - NXP Semiconductors |
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OQ2538U Datasheet(HTML) 7 Page - NXP Semiconductors |
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7 / 24 page  1998 Oct 14 7 Philips Semiconductors Product specification SDH/SONET STM16/OC48 main amplifiers OQ2538HP; OQ2538U An external 200 Ω resistor between IN and INQ is recommended in order to match the inputs to a differential transmission line, coupled microstrip or stripline with an odd mode impedance Zo(odd) =50 Ω, as shown in Fig.4. For single-ended excitation, separate matching networks on IN and INQ, as depicted in Fig.5, achieve optimum matching. Care should be taken to avoid DC loading, since the OQ2538HP controls its own DC input voltage. The resistors on the unused input INQ may be combined for convenience. In both cases, the essence of good matching is the equity of the circuitry on both input pins. The impedance seen on pins IN and INQ should be as equal as possible. For more information see “Application Note AN96051” describing the OM5801 STM16 demo board. Fig.4 Differential input matching. handbook, halfpage differential line Zo(odd) = 50 Ω MGM115 200 Ω IN INQ 22 nF 22 nF Fig.5 Single-ended input matching. handbook, halfpage MGM116 100 Ω 100 Ω 50 Ω IN INQ 22 nF 22 nF 22 nF 22 nF Zo = 50 Ω transmission line RF output matching circuit Matching of the main amplifier outputs, OUT and OUTQ, is not mandatory. In most applications, the receiving end of the transmission line will be properly matched, so very little reflection will occur. Matching the transmitting end to absorb these reflections is only recommended for very sensitive applications. In such cases, 100 Ω pull-up resistors should be connected from OUT and OUTQ to ground, as close as possible to the IC pins. These matching resistors will not be needed in most applications, however. The output circuit of the OQ2538HP is depicted in Fig.6. For more information see “Application Note AN96051” describing the OM5801 STM16 demo board. Fig.6 RF output topology. handbook, halfpage MGM117 OUT OUTQ GND 100 Ω 100 Ω |
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