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| HFA3925 Data Sheet July 1998 File Number 4132.4 2.4GHz - 2.5GHz 250mW Power Amplifier The Intersil 2.4GHz PRISMTM chip set is a highly integrated five-chip solution for RF modems employing Direct Sequence Spread Spectrum (DSSS) signaling. The HFA3925 2.4GHz2.5GHz, 250mW power amplifier is one of the five chips in the PRISMTM chip set (see the Typical Application Diagram). TM Features * Highly Integrated Power Amplifier with T/R Switch * Operates Over 2.7V to 6V Supply Voltage * High Linear Output Power (P1dB: +24dBm) * Individual Gate Control for Each Amplifier Stage * Low Cost SSOP-28 Plastic Package The Intersil HFA3925 is an integrated power amplifier with transmit/receive switch in a low cost SSOP 28 plastic package. The power amplifier delivers +27dB of gain with high efficiency and can be operated with voltages as low as 2.7V. The power amplifier switch is fully monolithic and can be controlled with CMOS logic levels. The HFA3925 is ideally suited for QPSK, BPSK or other linearly modulated systems in the 2.4GHz Industrial, Scientific, and Medical (ISM) frequency band. It can also be used in GFSK systems where levels of +25dBm are required. Typical applications include Wireless Local Area Network (WLAN) and wireless portable data collection. REMEMBER: Always apply Negative power to the VG pins before applying the Positive VDD bias. Failure to do so may result in the destruction of the HFA3925 Power Amplifier. Applications * Systems Targeting IEEE 802.11 Standard * TDD Quadrature-Modulated Communication Systems * Wireless Local Area Networks * PCMCIA Wireless Transceivers * ISM Systems * TDMA Packet Protocol Radios * PCS/Wireless PBX Ordering Information PART NUMBER HFA3925IA HFA3925IA96 TEMP. RANGE (oC) -40 to 85 -40 to 85 PACKAGE 28 Ld SSOP Tape and Reel PKG. NO. M28.15 Pinout HFA3925 (SSOP) TOP VIEW GND GND GND GND GND GND GND RX OUT VG2 1 2 3 4 5 6 7 8 9 28 GND 27 VDD TR 26 T/R CNTRL 25 RF OUT 24 GND 23 VDD3 22 GND 21 GND 20 GND 19 GND 18 VDD2 17 VG3 16 GND 15 RF IN Functional Block Diagram T/R CNTRL VDDX(+) VGX(-) STAGE BIAS CONTROL RX OUT RF IN STAGE 1 STAGE 2 STAGE 3 RF_OUT TO ANTENNA GND 10 VDD1 11 GND 12 GND 13 VG1 14 2-179 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. http://www.intersil.com or 407-727-9207 | Copyright (c) Intersil Corporation 1999 PRISM(R) is a registered trademark of Intersil Corporation. PRISM logo is a trademark of Intersil Corporation. HFA3925 Typical Application Diagram HFA3724 (FILE# 4067) TUNE/SELECT HSP3824 (FILE# 4064) RXI DATA TO MAC CTRL SPREAD DPSK MOD. PRISMTM CHIP SET FILE #4063 HFA3424 (NOTE) (FILE# 4131) A/D DESPREAD DPSK DEMOD HFA3624 UP/DOWN CONVERTER (FILE# 4066) I RXQ A/D CCA 802.11 MAC-PHY INTERFACE /2 0o/90o M U X M U X RSSI A/D TXI RFPA HFA3925 (FILE# 4132) VCO VCO TXQ Q QUAD IF MODULATOR DUAL SYNTHESIZER DSSS BASEBAND PROCESSOR HFA3524 (FILE# 4062) TYPICAL TRANSCEIVER APPLICATION USING THE HFA3925 NOTE: Required for systems targeting 802.11 specifications. For additional information on the PRISMTM chip set, call (407) 724-7800 to access Intersil AnswerFAX system. When prompted, key in the four-digit document number (File #) of the datasheets you wish to receive. The four-digit file numbers are shown in the Typical Application Diagram, and correspond to the appropriate circuit 2-180 HFA3925 Absolute Maximum Ratings Maximum Input Power (Note 2) . . . . . . . . . . . . . . . . . . . . . . +23dBm Operating Voltages (Notes 2, 3). . . . . . . . . . . . VDD = 8V, VGG = -8V Thermal Information Thermal Resistance (Typical, Note 1) JA (oC/W) SSOP Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88 Maximum Storage Temperature Range . . . . . . . . . . -65oC to 150oC Operating Conditions Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to 85oC CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. NOTE: 1. JA is measured with the component mounted on an evaluation PC board in free air. Electrical Specifications POWER AMPLIFIER Linear Gain VSWR In/Out Input Return Loss Output Return Loss Output Power at P1dB Second Harmonic at P1dB Third Harmonic at P1dB IDD at P1dB (VDD1 + VDD2 + VDD3) TA = 25oC, Z0 = 50, VDD = +5V, PIN = -30dBm, f = 2.45GHz, Unless Otherwise Specified MIN TYP MAX UNITS PARAMETER 27 22.5 - 28 1.75:1 -11.3 -11.3 24.5 -20 -30 270 32 0 -10 375 dB dB dB dBm dBc dBc mA NOTES: 2. Ambient temperature (TA) = 25oC. 3. |VDD | + |VGG | not to exceed 12V. Pin Description PINS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 SYMBOL GND DESCRIPTION DC and RF Ground. DC and RF Ground. DC and RF Ground. DC and RF Ground. DC and RF Ground. DC and RF Ground. DC and RF Ground. Output of T/R Switch for receive mode. Negative bias control for the second PA stage, adjusted to set VDD2 quiescent bias current, which is typically 53mA. Typical voltage at pin = -0.75V. Input impedance: > 1M. DC and RF Ground. Positive bias for the first stage of the PA, 2.7V to 6V. DC and RF Ground. DC and RF Ground. Negative bias control for the first PA stage, adjusted to set VDD1 quiescent bias current, which is typically 20mA. Typical voltage at pin = -0.75V. Input impedance: > 1M. RF Input of the Power Amplifier. DC and RF Ground. GND GND GND GND GND GND RX OUT VG2 GND VDD1 GND GND VG1 RF IN GND 2-181 HFA3925 Pin Description PINS 17 18 19-22 23 24 25 26 27 28 (Continued) DESCRIPTION Negative bias control for the third PA stage, adjusted to set VDD3 quiescent bias current, which is typically 90mA. Typical voltage at pin = -0.95V. Input impedance: > 1M. Positive bias for the second stage of the PA. 2.7V to 6V. DC and RF Ground. Positive bias for the third stage of the PA. 2.7V to 6V. DC and RF Ground. RF output of T/R switch and power amplifier for transmit mode. 0V for transmit mode, +5V for receive mode. Low < = 0.2V, high > = VDD -0.2V. VDD for T/R switch. DC and RF Ground. SYMBOL VG3 VDD2 GND VDD3 GND RF OUT T/R CTRL VDD TR GND NOTE: Process variation will effect VG3 voltage requirement to develop 90mA stage 3 quiescent current, maximum range = -0.69V to -1.04V. Typical Performance Curves Power Amplifier Small Signal Performance NOTE: All data measured at TA = 25oC and VG1, VG2 and VG3 adjusted for first stage quiescent current of 20mA, second stage current of 53mA and third stage current of 90mA, respectively 35 6V -5 4V VDD1 = VDD2 = VDD3 -10 3V GAIN (dB) 25 RETURN LOSS (dB) 5V 30 -15 20 -20 4V -25 3V 5V 6V 15 10 2.0 2.2 2.4 2.6 FREQUENCY (GHz) 2.8 3.0 -30 2.0 2.2 2.4 2.6 FREQUENCY (GHz) 2.8 3.0 FIGURE 1. LINEAR GAIN FIGURE 2. INPUT MATCH 0 RETURN LOSS (dB) -5 -10 5V -15 3V 4V -20 2.0 6V 2.2 2.4 2.6 FREQUENCY (GHz) 2.8 3.0 FIGURE 3. OUTPUT MATCH 2-182 HFA3925 Typical Performance Curves (Continued) Power Amplifier CW Performance at Various Supply Voltages NOTE: All data measured at TA = 25oC and VG1, VG2 and VG3 adjusted for first stage quiescent current of 20mA, second stage current of 53mA and third stage current of 90mA, respectively. 30 2.45GHz, VDD1 = VDD2 = VDD3 5V 25 4V POWER (dBm) 3V 20 EFFICIENCY (%) 30 3V 20 6V 40 6V 4V 50 2.45GHz, VDD1 = VDD2 = VDD3 5V 15 10 10 5 -19 -14 -9 POWER INPUT (dBm) -4 1 0 -19 -14 -9 INPUT POWER (dBm) -4 1 FIGURE 4. POWER OUTPUT FIGURE 5. POWER ADDED EFFICIENCY 0 6V -1 COMPRESSION (dBm) 5V -2 4V -3 3V -4 -5 -6 -7 -19 2.45GHz, VDD1 = VDD2 = VDD3 -14 -9 INPUT POWER (dBm) -4 1 FIGURE 6. GAIN COMPRESSION Power Amplifier Temperature Performance NOTE: All data measured at TA = 25oC and VG1, VG2 and VG3 adjusted for first stage quiescent current of 20mA, second stage current of 53mA and third stage current of 90mA, respectively. 35 30 2.45GHz, VDD1 = VDD2 = VDD3 = +5V 30 POWER (dBm) 25oC GAIN (dB) 25 70oC 20 -20oC 20 15 10 25oC 25 -20oC 70oC 15 5 10 2.0 VDD1 = VDD2 = VDD3 = +5V 2.2 2.4 2.6 FREQUENCY (GHz) 2.8 3.0 0 -19 -14 -9 INPUT POWER (dBm) -4 1 FIGURE 7. LINEAR GAIN FIGURE 8. POWER OUTPUT 2-183 HFA3925 Typical Performance Curves 0 (Continued) -1 COMPRESSION (dB) -20oC -2 25oC -3 70oC -4 2.45GHz, VDD1 = VDD2 = VDD3 = +5V -5 -20 -10 -5 -15 INPUT POWER (dBm) 0 5 FIGURE 9. GAIN COMPRESSION Power Amplifier Spurious Response at Various Supply Voltages NOTE: All data measured at TA = 25oC and VG1, VG2 and VG3 adjusted for first stage quiescent current of 20mA, second stage current of 53mA and third stage current of 90mA, respectively. 50 2.45GHz, TONE SPACING 600kHz 70 2.45GHz, VDD1 = VDD2 = VDD3 65 40 60 IMR (dBc) 5V 6V 30 5V dBc 55 6V 50 4V 20 3V 4V 45 40 25 35 3V 10 9 13 17 21 FUNDAMENTAL POUT OF TONES (dBm) 15 17 19 21 FUNDAMENTAL POUT (dBm) 23 25 FIGURE 10. THIRD ORDER INTERMODULATION RATIO FIGURE 11. SECOND HARMONIC RATIO 60 55 6V 50 dBc 5V 45 4V 40 3V 35 15 2.45GHz, VDD1 = VDD2 = VDD3 17 19 21 FUNDAMENTAL POUT (dBm) 23 25 FIGURE 12. THIRD HARMONIC RATIO 2-184 HFA3925 Typical Performance Curves 0 (Continued) Transmit/Receive Switch Performance NOTE: All data measured with VDD TR = +5V, TA = 25oC. -5 0 RETURN LOSS (dB) -1 INSERTION LOSS (dB) -10 ISOLATION (dB) -5 -2 -15 -10 -3 -20 INPUT -15 OUTPUT -4 -25 -5 2.0 2.2 2.4 2.6 FREQUENCY (GHz) 2.8 -30 3.0 -20 2.0 2.2 2.4 2.6 FREQUENCY (GHz) 2.8 3.0 FIGURE 13. RECEIVE MODE T/R INSERTION LOSS/ISOLATION FIGURE 14. RECEIVE MODE T/R SWITCH MATCH Typical Application Example VDD (T/R ANT) C8 1 2 3 4 5 RX OUT (50 TRANSMISSION LINE) VG2 (-) R3 R6 C11 C25 6 7 8 9 10 VDD1 (+) 11 C22 C12 C5 12 13 VG1 (-) R2 R5 C13 C23 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 RF IN (50 TRANSMISSION LINE) C14 R4 R1 VG3 (-) VDD2 (+) C3 C15 C18 C4 C16 C19 C24 RF OUT (50 TRANSMISSION LINE) VDD3 (+) T/R CNTRL C7 C20 C21 EXTERNAL CIRCUITRY PARTS LIST LABEL C3-C5, C7, C8 C23-C24 C11-C16 C18-C22 R1, R6 R3, R5 R2 R4 VALUE 22pF 22pF 1000pF 0.01F 1.5k 5k 12k 1k PURPOSE Bypass (GHz) DC Block Bypass (MHz) Bypass (kHz) FET Gate Divider Network NOTE: All off-chip components are low cost surface mount components obtainable from multiple sources. (0.020in x 0.040in or 0.030in x 0.050in.) 2-185 HFA3925 Typical Application Diagram MMBT2222ALT1 MOTOROLA SOT 23 PAPE STEP 0 TO +3.5V PAPE 4.7K 5K VCC2 G2 S2 4 3 G1 S1 1000pF 1 GND GND 28 5pF 2 1 VCC1 330 Positive Supply, Single Stage 3 Adjustment Circuit RF1K49093 2 GND 3 GND 4 GND L8 BEAD 5 GND 6 GND 0.1F 7 GND 8 9 VG2 0.1F 4 5 3 6 3.01K 10 GND 11 VDD1 12 GND 13 GND 7 8 500pF RF OUT 15nH VCC2 820 10K 0.1F 8 7 6 5 4.7F + TANTL 1K MMBT 2222 ALT1 +IN ICL7660SIBA SUPER VOLTAGE CONVERTER 1 2 + VCC1 = +5V VCC2 = +3.5V 715 14 VG1 0.1F 3.01K 5 35 2 1 -OUT + TO -V CONVERTER 3 4 MOTOROLA 4.7F TANTL LNA 6 7 8 D1 715 RX OUT HFA3925 VDD T/R 27 T/R CTRL 26 25 GND 24 VDD3 23 GND 22 GND 21 GND 20 GND 19 VDD2 18 VG3 17 0.1F GND 16 15 22pF RF IN RF OUT 22pF D2 D2 D1 HFA3424 RF IN POWER UP TIMING +3.5V PAPE 0V +3.5V VCC2 RECEIVE ENABLED TRANSMIT ENABLED 0V TRUTH TABLE PAPE Low (0) High (1) TR/CTRL High (1) Low (0) MODE Receive Transmit +5V VCC1 0V 25ms MIN 2-186 HFA3925 All Intersil semiconductor products are manufactured, assembled and tested under ISO9000 quality systems certification. Intersil semiconductor products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see web site http://www.intersil.com Sales Office Headquarters NORTH AMERICA Intersil Corporation P. O. Box 883, Mail Stop 53-204 Melbourne, FL 32902 TEL: (407) 724-7000 FAX: (407) 724-7240 EUROPE Intersil SA Mercure Center 100, Rue de la Fusee 1130 Brussels, Belgium TEL: (32) 2.724.2111 FAX: (32) 2.724.22.05 ASIA Intersil (Taiwan) Ltd. 7F-6, No. 101 Fu Hsing North Road Taipei, Taiwan Republic of China TEL: (886) 2 2716 9310 FAX: (886) 2 2715 3029 2-187 |
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