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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
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LMX2364 bảng dữ liệu(PDF) 21 Page - National Semiconductor (TI) |
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LMX2364 bảng dữ liệu(HTML) 21 Page - National Semiconductor (TI) |
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21 / 39 page  Charge Pump Currents 20050675 The above block diagram shows the test procedure for test- ing the RF and IF charge pumps. These tests include abso- lute current level, mismatch, and leakage. In order to mea- sure the charge pump currents, a signal is applied to the high frequency input pins. The reason for this is to guarantee that the phase detector gets enough transitions in order to be able to change states. If no signal is applied, it is possible that the charge pump current reading will be low due to the fact that the duty cycle is not 100%. The OSCinIF Pin is tied to the supply. The charge pump currents can be measured by simply programming the phase detector to the necessary polarity. For instance, in order to measure the RF charge pump current, a 10 MHz signal is applied to the FinRF pin. The source current can be measured by setting the RF PLL phase detector to a positive polarity, and the sink current can be measured by setting the phase detector to a negative polarity. The IF PLL currents can be measured in a similar way. Note that the magnitude of the RF and IF PLL charge pump currents are also controlled by the RF_CP and IF_CP bits. Once the charge pump currents are known, the mis- match can be calculated as well. In order to measure leak- age currents, the charge pump current is set to a TRI-STATE mode by enabling the counter reset bits. This is RF_RST for the RF PLL and IF_RST for the IF PLL. www.national.com 21 |
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