lt5521 Linear Technology Corporation, lt5521 Datasheet
lt5521
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lt5521 Summary of contents
Page 1
... LO leakage applications. The chip includes a high speed LO buffer with single-ended input and a double-balanced active mixer. The LT5521 requires only –5dBm LO input power to achieve excellent distor- tion and noise performance, while reducing external drive circuit requirements ...
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... Internally Biased 3.3V, Internally Biased 5V 2.9V CONDITIONS 1700MHz O LO Requires Matching Requires Matching U W INFORMATION ORDER PART TOP VIEW NUMBER LT5521EUF + 1 12 OUT 2 11 GND GND – OUT PART MARKING UF PACKAGE ...
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... (Note MIN TYP MAX –0.5 –0.013 +11 13.5 = –7dBm/Tone +25.8 = –7dBm/Tone, +50 –36 – IF1 LT5521 UNITS dB dB/ C dBm dB dBm dBm dBm dBm UNITS dB dB/ C dBm dB dBm dBm dBm dBm UNITS dB dB/ C dBm dB dBm dBm dBm ...
Page 4
... LT5521 W U TYPICAL DC PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage (5V Application) 100 4.7 4.8 4.9 5 TYPICAL AC PERFOR A CE CHARACTERISTICS f = 1700MHz 250MHz 1950MHz shown in Figure 1 is tuned for 1.95GHz output frequency and V Fundamental, 2nd and 3rd Order ...
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... Low Side LO (LS) and High Side LO (HS) Comparison: Noise Figure vs RF Frequency LS 110 HS 121 f = 250MHz 1700 1900 1950 2000 2050 2100 1750 1800 1850 RF (MHz) OUT 5521 G14 LT5521 = 1950MHz 5521 G08 0 5 5521 G11 5521f 5 ...
Page 6
... LT5521 W U TYPICAL AC PERFOR A CE CHARACTERISTICS P = –5dBm 5V 2.9V unless otherwise noted. Test circuit shown in Figure 1 is tuned for 1.045GHz output frequency. Fundamental, 2nd and 3rd Order Intermodulation Distortion vs Input Power FUND IM3 –20 –40 IM2 –60 IM2 – ...
Page 7
... C, unless otherwise noted. Test circuit A Conversion Gain and IIP3 vs RF Frequency – –2 –4 1750 1800 1850 1900 1950 2000 2050 10 RF (MHz) OUT LT5521 1105 1145 5521 G24 27 25 IIP3 2100 2150 5521 G27 5521f 7 ...
Page 8
... LT5521 W U TYPICAL AC PERFOR A CE CHARACTERISTICS = –5dBm 3.3V 2.9V unless otherwise noted. Test circuit shown in Figure 1 is tuned for 1.95GHz output CC A frequency and V = 3.3V. CC LO-RF Leakage vs LO Frequency – –33 –40 C –34 –35 –36 –37 –38 –39 –40 1700 ...
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... GND 10 – OUT 9 5521 4.4 0.017" r GND 0.062" DC 0.017" GND OUT 50 C4 C12 C11 5521 F01 f = 250MHz 1.95GHz 1.7GHz 3. 22 10pF 0 2.7nH 3 3 M/A-COM MABACT0010 M/A-COM ETC1.6-4-2-3 6.8pF 82pF 82pF 1nF 1 F 100nH 10k LT5521 5521f 9 ...
Page 10
... Signal Input Interface Figure 2 shows the signal inputs of the LT5521. The signal input pins are connected to the common emitter nodes of the mixer quad differential pairs. The real part of the + – differential IN /IN impedance The mixer core current is set by external resistors R1 and R7 ...
Page 11
... LO sup- pression performance. – IN Figure 6 indicates the typical performance of the LT5521 as the external source resistance (R1, R7) is varied while 5521 F05 keeping the supply current constant. Figure 6 data was taken without the benefit of input chokes, and shows the gradual gain degradation for smaller values of the input resistors R1 and R7 ...
Page 12
... CORE CURRENT (mA) Figure 8. Comparison of 3.3V Performance With and Without Input RF Choke The user can tailor the biasing of the LT5521 to meet 30 individual system requirements recommended to 25 choose a source resistance as large as possible to mini- mize sensitivity to power supply variation Output Interface ...
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... Figure 11. LT5521 Performance for an Application Tuned to 3.5GHz with Low Side (LS) and High Side (HS) LO Injection 2.2 LO Interface 5521 F10 The LO input pin is internally matched has an internal DC bias of 960mV. External AC coupling is re- quired. Figure 12 shows a simplified schematic of the LO input ...
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... ACPR Performance 3500 4000 Because of its high linearity and low noise, the LT5521 offers 5521 F13 outstanding ACPR performance in a variety of applications. For example, Figures 15 and 16 show ACPR and Alternate Channel measurements for single channel and 4-channel 64 DPCH W-CDMA signals at 1 ...
Page 15
... DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LT5521 BOTTOM VIEW—EXPOSED PAD 0.75 0. 0.115 TYP ...
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... LT5521 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LT5511 High Linearity Upconverting Mixer LT5512 DC-3GHz High Signal Level Downconverting Mixer LT5514 Ultralow Distortion, Wideband Digitally Controlled Gain Amplifier/ADC Driver LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator LT5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator ...