adl5372 Analog Devices, Inc., adl5372 Datasheet
adl5372
Available stocks
Related parts for adl5372
adl5372 Summary of contents
Page 1
... WiMAX/broadband wireless access systems Satellite modems GENERAL DESCRIPTION The ADL5372 is a member of the fixed-gain quadrature modulator (F-MOD) family designed for use from 1500 MHz to 2500 MHz. Its excellent phase accuracy and amplitude balance enable high performance intermediate frequency or direct radio frequency modulation for communication systems. The ADL5372 provides a > ...
Page 2
... ADL5372 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 5 ESD Caution.................................................................................. 5 Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 11 Circuit Description..................................................................... 11 Basic Connections .......................................................................... 12 Optimization ............................................................................... 13 Applications Information .............................................................. 14 REVISION HISTORY 12/06—Revision 0: Initial Version DAC Modulator Interfacing ..................................................... 14 Limiting the AC Swing ...
Page 3
... P = 6.2 dBm LO BB OUT = 4.5 MHz dBm per tone BB OUT = 4.5 MHz dBm per tone BB OUT = −10 dBm dBm 2350 MHz OUT LO Rev Page ADL5372 Min Typ Max 1500 2500 7.1 14.2 −45 −45 0.21 0.09 −50 − −158 −158 −157.6 7 ...
Page 4
... ADL5372 Parameter Conditions LO INPUTS 1 LO Drive Level Characterization performed at typical level Input Return Loss See Figure 9 for a plot of return loss vs. frequency BASEBAND INPUTS Pin IBBP, Pin IBBN, Pin QBBP, Pin QBBN I and Q Input Bias Level Input Bias Current Current sourcing from each baseband input with a bias of 500 mV dc ...
Page 5
... Exposure to absolute 1100 mW maximum rating conditions for extended periods may affect 54°C/W device reliability. 150°C −40°C to +85°C ESD CAUTION −65°C to +150°C Rev Page ADL5372 ...
Page 6
... ADL5372 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic 12, COM1 to COM4 21 VPS1 to VPS5 8, 9 LOIP, LOIN 13 VOUT 19, 20, 23, 24 IBBP, IBBN, QBBN, QBBP Exposed Paddle COM1 1 18 VPS5 F-MOD COM1 2 17 ...
Page 7
... LO FREQUENCY (MHz 120 1500MHz S11 OF LOIP S22 OF OUTPUT 150 180 2500MHz 1500MHz 2500MHz 210 240 300 270 Figure 8. Smith Chart of LOIP S11 and VOUT S22 (f from 1600 MHz to 2500 MHz) LO ADL5372 and Temperature LO = 4.75V S and Supply 330 ...
Page 8
... ADL5372 0 –5 –10 –15 –20 –25 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 LO FREQUENCY (MHz) Figure 9. Return Loss (S11) of LOIP 0 –10 – –40° +85°C A –30 –40 – +25°C –60 A –70 –80 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 LO FREQUENCY (MHz) Figure 10 ...
Page 9
... FREQUENCY (MHz) Figure 19. OIP2 vs. Frequency and Temperature SSB OUTPUT POWER (dBm) CARRIER FEEDTHROUGH (dBm) SIDEBAND SUPPRESSION (dBc) THIRD ORDER (dBc) SECOND ORDER (dBc) –6 –4 – AMPLITUDE (dBm) vs. LO Amplitude (f OUT ADL5372 1900 MHz) LO ...
Page 10
... ADL5372 –20 SSB OUTPUT POWER (dBm) –30 FEEDTHROUGH (dBm) –40 –50 SIDEBAND SUPPRESSION (dBc) –60 SECOND ORDER (dBc) –70 –6 –4 – AMPLITUDE (dBm) Figure 21. Second- and Third-Order Distortion, Carrier Feedthrough, Sideband Suppression, and SSB P vs. LO Amplitude (f OUT 0.20 0.19 0. 5.25V S 0. ...
Page 11
... THEORY OF OPERATION CIRCUIT DESCRIPTION Overview The ADL5372 can be divided into five circuit blocks: the LO interface, the baseband voltage-to-current (V-to-I) converter, the mixers, the differential-to-single-ended (D-to-S) stage, and the bias circuit. A detailed block diagram of the device is shown in Figure 24. LOIP PHASE SPLITTER LOIN ...
Page 12
... This results in a reduction in C16 the usable input ac swing range. The nominal dc bias of 500 mV 0.1µF allows for the largest ac swing, limited on the bottom end by the ADL5372 input range and on the top end by the output compliance C15 0.1µF range on most DACs from Analog Devices. VPS5 ...
Page 13
... In a real modulator, those two quantities are nonzero; and, when mixed with the LO, they result in a finite amount of carrier feedthrough. The ADL5372 is designed to provide a minimal amount of carrier feedthrough. Should even lower carrier feedthrough levels be required, minor adjustments can be made to the (V and (V − ...
Page 14
... OUT2_P Figure 29. Interface Between the AD9779 and ADL5372 with 50 Ω Resistors to Ground to Establish the 500 mV DC Bias for the ADL5372 Baseband Inputs The AD9779 output currents have a swing that ranges from mA. With the 50 Ω resistors in place, the ac voltage swing going into the ADL5372 baseband inputs ranges from ...
Page 15
... AUX2_P 500Ω Figure 33. DAC Modulator Interface with Auxiliary DAC Resistors GSM OPERATION Figure 34 shows the GSM EVM, spectral mask, and noise vs. the output power for the ADL5372 at 1960 MHz. For a given LO amplitude, the performance is independent of output power. 4.0 F-MOD 3.5 19 IBBP 3 ...
Page 16
... MHz noise floor of −157 dBm/Hz. Figure 36 and Figure 37 show the ACPR and 20 MHz offset noise floor of the ADL5372 vs. the output power at LO frequencies of 1966 MHz and 2140 MHz, respectively. ...
Page 17
... AD9779 recommended in the previous sections of this data sheet means the only DAC that can be used to drive the ADL5372. There are other appropriate DACs, depending on the level of performance required. Table 6 lists the dual TxDACs offered by Analog Devices. Table 6. Dual TxDAC Selection Table ...
Page 18
... This exposed paddle must be soldered to the board (see the Power Supply and Grounding section). The evaluation board is designed without any components on the underside so heat can be applied to the underside for easy removal and replacement of the ADL5372. QBBP QBBN IBBN ...
Page 19
... The primary setup used to characterize the ADL5372 is shown in Figure 41. This setup was used to evaluate the product as a single-sideband modulator. The Aeroflex signal generator supplied the LO and differential I and Q baseband signals to the device under test, DUT. The typical LO drive was 0 dBm. The I-channel is driven by a sine wave, and the Q-channel is driven by a cosine wave ...
Page 20
... Figure 42. Setup for Baseband Frequency Sweep and Undesired Sideband Nulling The setup used to evaluate baseband frequency sweep and undesired sideband nulling of the ADL5372 is shown in Figure 42. The interface board has circuitry that converts the single-ended I input and Q input from the arbitrary function generator to differential I and Q baseband signals with a dc bias of 500 mV ...
Page 21
... Package Description 24-Lead LFCSP_VQ, 7” Tape and Reel 24-Lead LFCSP_VQ, 7” Tape and Reel 24-Lead LFCSP_VQ, Waffle Pack Evaluation Board Rev Page 0.60 MAX PIN 1 INDICATOR 2.45 EXPOSED 2.30 SQ PAD (BO TTOMVIEW) 2. 0.23 MIN 2.50 REF Package Option Ordering Quantity CP-24-2 250 CP-24-2 1,500 CP-24-2 64 ADL5372 ...
Page 22
... ADL5372 NOTES Rev Page ...
Page 23
... NOTES Rev Page ADL5372 ...
Page 24
... ADL5372 NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06511-0-12/06(0) T Rev Page ...