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LT5572EUF Datasheet(PDF) 10 Page - Linear Technology |
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LT5572EUF Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  LT5572 10 5572f input (2VP-P,DIFF). This maximum RF output level is limited by the 0.5VPEAK maximum baseband swing possible for a 0.5VDC common mode voltage level (assuming no extra negative supply voltage available). It is possible to bias the LT5572 to a common mode base- band voltage level other than 0.5V. Table 1 shows the typical performance for different common mode voltages. LO section The internal LO input amplifier performs single-ended to differential conversion of the LO input signal. Figure 4 shows the equivalent circuit schematic of the LO input. The internal, differential LO signal is split into in-phase and quadrature (90° phase shifted) signals that drive LO buffer sections. These buffers drive the double balanced I and Q mixers. The phase relationship between the LO input and the internal in-phase LO and quadrature LO signals is fixed, and is independent of start-up conditions. The phase shifters are designed to deliver accurate quadrature signals for an LO frequency near 2GHz. For frequencies significantly below 1.8GHz or above 2.4GHz, the quadra- ture accuracy will diminish, causing the image rejection to degrade. The LO pin input impedance is about 50Ω and the recommended LO input power is 0dBm. For lower LO input power, the gain, OIP2, OIP3 and dynamic range will degrade, especially below –5dBm and at TA = 85°C. For high LO input power (e.g., 5dBm), the LO feedthrough will increase, without improvement in linearity or gain. Harmonics present on the LO signal can degrade the image rejection, because they introduce a small excess phase shift in the internal phase splitter. For the second (at 4GHz) and third harmonics (at 6GHz) at –20dBc level, the introduced signal at the image frequency is about –57dBc or lower, corresponding to an excess phase shift much less than 1 degree. For the second and third harmonics at –10dBc, still the introduced signal at the image frequency is about –47dBc. Higher harmonics than the third will have less impact. The LO return loss typically will be better than 14dB over the 1.7GHz to 2.4GHz range. Table 2 shows the LO port input impedance vs frequency. Table 2. LO Port Input Impedance vs Frequency for EN = High and PLO = 0dBm FREQUENCY INPUT IMPEDANCE S11 (MHz) (Ω) Mag Angle 1000 45.9+j15.7 0.167 95 1400 60.8+j2.1 0.099 9.4 1600 63.2-j6.0 0.128 –22 1800 61.8-j14.2 0.163 –44 2000 56.4-j16.8 0.165 –61 2200 51.7-j14.7 0.144 –75 2400 47.3-j11.3 0.119 –97 2600 42.5-j8.6 0.122 –126 The input impedance of the LO port is different if the part is in shutdown mode. The LO input impedance for EN = Low is given in Table 3. Table 1. Typical Performance Characteristics vs VCM for fLO = 2GHz, PLO = 0dBm VCM (V) ICC (mA) GV (dB) OP1dB (dBm) OIP2 (dBm) OIP3 (dBm) NFloor (dBm/Hz) LOFT (dBm) IR (dBc) 0.1 77 –1.3 0.0 47 8.3 –163.2 –45.6 –42.2 0.2 89 –2.7 4.7 45 11.4 –162.2 –42.6 –36.2 0.3 101 –2.1 7.1 49 15.0 –160.9 –42.0 –37.0 0.4 113 –2.0 8.6 51 18.2 –160.2 –42.4 –39.3 0.5 126 –1.9 9.3 52 21.2 –159.2 –42.4 –41.5 0.6 138 –1.9 9.1 52 21.1 –158.6 –42.1 –44.4 APPLICATIO S I FOR ATIO VCC 20pF LO INPUT ZIN ≈ 56Ω 5572 F04 Figure 4. Equivalent Circuit Schematic of the LO Input |
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