lt5518 Linear Technology Corporation, lt5518 Datasheet
lt5518
Available stocks
Related parts for lt5518
lt5518 Summary of contents
Page 1
... TO 2.4GHz 11 PA 0° 90° LO FEEDTHROUGH BALUN CAL OUT IMAGE CAL OUT CAL 3 VCO/SYNTHESIZER 5518 TA01a LT5518 1.5GHz–2.4GHz High Linearity Direct U W-CDMA ACPR, AltCPR and Noise vs RF Output Power at 2140MHz for 1 and 4 Channels –55 4-CH ACPR –60 4-CH ALTCPR –65 1-CH ACPR –70 – ...
Page 2
... EN = High 0dBm (Note 16 Low 0dBm (Note 16 High (Note Low (Note 6) (Note 5) at 2GHz (Note 5) at 2GHz (Note 5) at 2GHz U W ORDER PART TOP VIEW NUMBER LT5518EUF 12 GND GND UF PART 9 GND MARKING 5518 = 37°C 25° ...
Page 3
... Note 18: Common mode current range where the common mode (CM) feedback loop biases the part properly. The common mode current is the sum of the current fl owing into the BBPI (or BBPQ) pin and the current fl owing into the BBMI (or BBMQ) pin. LT5518 = 25° 2GHz 2.002GHz, P ...
Page 4
... LT5518 W U TYPICAL PERFOR A CE CHARACTERISTICS P = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 2.06V LO LO feedthrough nulling (upper sideband selection otherwise noted. (Note 3) Supply Current vs Supply Voltage 140 T = 85° 25°C 130 A 120 T = –40°C A 110 100 4.5 5.0 SUPPLY VOLTAGE (V) ...
Page 5
... I AND Q BASEBAND VOLTAGE (V P-P, DIFF LT5518 High 25° 2.14GHz 2MHz, I and Q 90° shifted without image BB Absolute I/Q Phase Imbalance vs LO Frequency 5 5V – 40° 25°C ...
Page 6
... LT5518 W U TYPICAL PERFOR A CE CHARACTERISTICS P = 0dBm. BBPI, BBMI, BBPQ, BBMQ inputs 2.06V feedthrough nulling unless otherwise noted. (Note 3) Output IP2 vs LO Frequency 5V –40° 25° 85° 4.5V 25° ...
Page 7
... BBPI, BBMI, and BBPQ, BBMQ. These voltage signals are converted to currents and translated to RF frequency by means of double-balanced up-converting mixers. The mixer outputs are combined BBPI BBMI Figure 1. Simplifi ed Circuit Schematic of the LT5518 (Only I-Half is Drawn V-I 16 0° 90° ...
Page 8
... LT5518 baseband inputs is recommended. Active level shifters may be required to adapt the common mode level of the DAC outputs to the common mode input voltage of the LT5518 also possible to achieve a DC level shift with passive components, depending on the appli- cation. For example, if fl at frequency response not required, then the interface circuit of Figure 3 may be used. This fi ...
Page 9
... TO 20mA R1B 100Ω L1B GND Figure 3. LT5518 5th Order Filtered Baseband Interface with Common DAC (Only I-Channel is Shown will increase the voltage on the DAC output by dumping an extra current into resistors R1A, R1B, R2A and R2B. This current is about (V – ...
Page 10
... DAC C1 C2 L1B L2B 0mA TO 20mA Figure 4. LT5518 5th Order Filtered Baseband Interface with 3. Figure 5. Equivalent Circuit Schematic of the LO Input signifi cantly 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 ...
Page 11
... RF output to ground. For strong output RF signal 0.164 171 levels (higher than 3dBm) this ESD diode can degrade 0.228 159 the linearity performance if the 50Ω termination imped- ance is connected directly to ground. To prevent this, a LT5518 with no LO power applied is given in 22 Input Impedance S 22 Ω Mag 21 ...
Page 12
... This is strongly recommended during a 1dB compression measurement. Enable Interface Figure 7 shows a simplifi ed schematic of the EN pin inter- face. The voltage necessary to turn on the LT5518 is 1.0V. To disable (shutdown) the chip, the Enable voltage must be below 0.5V. If the EN pin is not connected, the chip is disabled. This EN = Low condition is guaranteed by the 75kΩ ...
Page 13
... ACPR will be limited by the noise performance of the part. In the middle, an optimum ACPR is obtained. Because of the LT5518’s very high dynamic range, the test equipment can limit the accuracy of the ACPR measure- ment. Consult the factory for advice on ACPR measure- ment, if needed ...
Page 14
... LT5518 U U APPLICATIO S I FOR ATIO is important to keep the amplitudes at the BBIP and BBIM inputs (or BBQP and BBQM) as equal as possible. When the temperature is changed after calibration, the LO feedthrough and the Image Rejection performance will change. This is illustrated in Figure 18. The LO feedthrough –55 4-CH ACPR – ...
Page 15
... 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 PACKAGE OUTLINE 0.30 ±0.05 0.65 BSC 0.75 ± 0.05 2.15 ± 0.10 (4-SIDES) 0.200 REF 0.00 – 0.05 LT5518 RF IM3 IM2 f = 2MHz, 2.1MHz, 0° BBI f = 2MHz, 2.1MHz, 90° BBQ P = 0dBm ...
Page 16
... LT5518 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LT5511 High Linearity Up-Converting Mixer LT5512 DC-3GHz High Signal Level Down-Converting Mixer LT5514 Ultralow Distortion, IF Amplifi er/ADC Driver with Digitally Controlled Gain LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator LT5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator ...