RF2498PCBA

RF2498 0 Typical Applications • CDMA/Cellular/PCS/GPS Handsets • JCDMA/GPS Handsets • CDMA Modem/Data Cards Product Description -A5.00 SQ. TRI-BAND/QUAD-MODE CDMA/GPS LOW NOISE AMPLIFIER/MIXER • Commercial and Consumer Systems • Portable Battery-Powered Equipment 0.10 C A 2 PLCS The RF2498 is a high performance CDMA tri-band/quadmode integrated LNA/mixer with GPS capability. The device is designed to meet all IS-98 sensitivity, intermodulation and single-tone requirements. The RF2498 integrates the tri-band LNA/downconverters with 27.5dB of gain control for the cellular band and 29dB for the PCS band. The RF2498 is designed for three state gain control solutions for IS-98 IMD testing. The device offers a dedicated GPS LNA/mixer with 37dB of gain. Additionally, a divide-by-2 prescaler to allow the use of either a single- or dual-band VCO is integrated. There is also a TX LO buffer. The design is flexible, in that the bias currents may be set using off-chip current reference resistors for the mixer and LNA blocks. The device is packaged in a plastic, 5mmx5mm, leadless chip carrier. Optimum Technology Matching® Applied Si BJT Si Bi-CMOS InGaP/HBT GaAs HBT SiGe HBT GaN HEMT GaAs MESFET Si CMOS SiGe Bi-CMOS 0.90 0.85 0.05 0.00 0.05 C 2.50 TYP 0.10 C B 2 PLCS 0.70 0.65 Dimensions in mm. 12° MAX 0.10 C B 2 PLCS -B2.37 TYP 4.75 SQ. 0.10 C A 2 PLCS SEATING PLANE -C0.10 M C A B NOTES: 1. Shaded lead is Pin 1. 2 Dimension applies to plated terminal: to be measured between 0.20 mm and 0.25 mm from terminal end. 0.60 0.24 TYP 0.30 2 0.18 PIN 1 ID 0.20 R 3.25 SQ. 2.95 0.50 0.30 0.50 Package Style: QFN, 32-Pin, 5x5 Features • GPS Receive Front-End Gain=37dB • Meets IMD Tests with Three Gain States/Two Logic Control Lines • Adjustable Mixer and LNA Bias Current • Selectable Divide-by-2 Prescaler • Integrated TX LO Buffer Amplifier GPS MIX IN 32 GPS+ 1 31 30 29 28 27 26 25 24 GPS LNA IN GPS LNA OUT 23 PCS LNA IN 22 IP SET 21 PCS LNA OUT 20 CELL LNA IN 19 CELL LNA EMITTER BAND SEL GPS- 2 CDMA+ 3 CDMA- 4 FM+ 5 /2 FM- 6 IF SEL ISET3 ISET2 ISET1 VCC1 VCC2 7 18 CELL LNA OUT Ordering Information RF2498 RF2498 PCBA Tri-Band/Quad-Mode CDMA/GPS Low Noise Amplifier/Mixer Fully Assembled Evaluation Board Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com LO IN 8 9 LO OUT 10 /2 SELECT 11 TX BUFF ENABLE 12 PCS RFA VCC 13 PCS MIX IN 14 CELL MIX IN 15 MIX GAIN 16 ENABLE 17 LNA GAIN Functional Block Diagram RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Rev A3 030711 8-301 RF2498 Absolute Maximum Ratings Parameter Supply Voltage Input LO and RF Levels Operating Ambient Temperature Storage Temperature Rating -0.5 to +5.0 +6 -40 to +85 -40 to +150 Unit VDC dBm °C °C Caution! ESD sensitive device. RF Micro Devices believes the furnished information is correct and accurate at the time of this printing. However, RF Micro Devices reserves the right to make changes to its products without notice. RF Micro Devices does not assume responsibility for the use of the described product(s). Parameter Overall RF Frequency Range Specification Min. Typ. Max. 800 to 900 1500 to 2200 1575.42 0.1 2.65 1.8 2.75 400 3.15 0.4 10 Unit MHz MHz MHz MHz V V V µA Condition T = 25°C, VCC =2.75V GPS band IF Frequency Range Power Supply Supply Voltage Logic High Logic Low Power Down Current Cellular Band JCDMA Band LNA (On) Gain Noise Figure Input IP3 Current Isolation +9.0 +5.0 13.5 13.0 15.0 14.5 1.1 1.0 +11.0 +9.0 6.5 4.5 23 -2.5 2.5 +25.0 0 2.5 16.5 16.0 1.3 1.2 dB dB dB dB dBm dBm mA mA dB dB dB dBm mA dB ENABLE=0 Freq=869MHz to 894MHz Freq=832MHz to 870MHz LNA 50 Ω match IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 LNA (Off) Gain Noise Figure Input IP3 Current Isolation -4.0 +20.0 -1.8 4.0 Mixer - CDMA/JCDMA Gain Noise Figure Input IP3 Current LO to RF Isolation LO Frequency Range IF Frequency Range 36 600 0.1 183.6 2300 400 +1.0 +11.0 11.5 1.5 13.0 3.0 7.5 14.0 +3.5 +13.0 18.5 13.5 14.5 4.5 8.5 16.0 dB dB dB dB dBm dBm mA mA dB dB MHz MHz LO IN=-4dBm See note 1 and 2. Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON/Mixer/LO Input Amps Mixer Preamp OFF/Mixer/LO Input Amps Mixer Preamp ON Mixer Preamp OFF High and Low Side LO Injection. See note 3 and 4. Typical IF frequencies: 85.38MHz, 109.80MHz, 111.85MHz, 183.6MHz 8-302 Rev A3 030711 RF2498 Parameter Cellular Band JCDMA Band, cont’d Mixer - FM Gain Noise Figure Input IP3 Current LO to RF Isolation LO Frequency Range IF Frequency Range 36 600 0.1 183.6 2300 400 +1.5 +11.0 11.5 1.5 13.0 3.0 7.5 14.0 +3.5 +14.0 18.5 13.5 14.5 4.5 8.5 16.0 dB dB dB dB dBm dBm mA mA dB dB MHz MHz LO IN=-4dBm See note 1 and 2. Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON/Mixer/LO Input Amps Mixer Preamp OFF/Mixer/LO Input Amps Mixer Preamp ON Mixer Preamp OFF High and Low Side LO Injection See note 3 and 4. Typical IF frequencies: 85.38MHz, 109.80MHz, 111.85MHz, 183.6MHz Specification Min. Typ. Max. Unit Condition Other LO-IF Isolation RF-IF Isolation LNA Out to Mixer In Isolation LO-LNA In Isolation, Any State 30 40 40 35 dB dB dB dB Freq=1930MHz to 1990MHz Freq=1840MHz to 1870MHz 13.5 13.0 15.5 15.0 1.5 1.4 +12.0 +4.0 6.5 4.5 20 -4 4 +26.0 0 4 17.5 16.5 1.8 1.7 dB dB dB dB dBm dBm mA mA dB dB dB dBm mA dB LO IN=-4dBm See note 1. Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON Mixer Preamp OFF Mixer Preamp ON/Mixer/LO Input Amps Mixer Preamp OFF/Mixer/LO Input Amps Mixer Preamp ON Mixer Preamp OFF High and Low Side LO Injection Typical IF frequencies: 183.6MHz, 210.38MHz, 220.38MHz LNA 50 Ω match IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 US PCS Band Korean PCS Band LNA (On) Gain Noise Figure Input IP3 Current Isolation +8.0 -2.0 LNA (Off) Gain Noise Figure Input IP3 Current Isolation -6 +20.0 6 Mixer Gain Noise Figure Input IP3 Current LO to RF Isolation LO Frequency Range IF Frequency Range 36 30 1600 0.1 +1.5 +11.0 12.0 2.5 14.0 4.5 7.0 15 +5.0 +13.0 19.0 14.0 15.5 6.5 8.5 17 dB dB dB dB dBm dBm mA mA dB dB MHz MHz 183.6 2400 400 Rev A3 030711 8-303 RF2498 Parameter Other LO-IF Isolation RF-IF Isolation LNA Out to Mixer In Isolation LO-LNA In Isolation, Any State 36 40 30 35 dB dB dB dB Freq=1575.42MHz 17.0 16 19.0 18 1.3 1.25 +5.0 -1.0 6.5 4.5 20 dB dB dB dB dBm dBm mA mA dB LNA 50 Ω match IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 LO IN=-4dBm See note 1. 16 18 5.5 7.0 -5.5 15.5 1800 0 400 dB dB dB dBm mA dB MHz dBm MHz High Side LO Injection. Low Side LO Injection. Preamp/Mixer/LO Input Amps High and Low Side LO Injection Typical IF frequencies: 183.6MHz, 210.38MHz, 220.38MHz Specification Min. Typ. Max. Unit Condition 40 GPS Band LNA (On) Gain Noise Figure Input IP3 Current Isolation +1.0 -5.0 1.7 1.7 Mixer Gain Noise Figure Input IP3 Current LO to RF Isolation LO Frequency Range LO Input Power Range IF Frequency Range -7.5 1350 -10 0.1 -4 183.6 Other LO-IF Isolation RF-IF Isolation LNA Out to Mixer In Isolation LO-LNA In Isolation, Any State 36 40 30 35 dB dB dB dB 1 pF BAND SEL, IF SEL, IP SET, LNA GAIN, ENABLE, MIX GAIN, TX BUFF ENABLE, /2 SELECT 40 Control Lines Input Capacitance Local Oscillator Input Cellular - CDMA/FM/JCDMA Input Power Input Frequency PCS Input Power Input Frequency GPS Input Power Input Frequency -10 600 1200 -10 1600 -10 1350 -4 0 1078 2156 0 2300 0 1800 dBm MHz MHz dBm MHz dBm MHz See note 3. High and Low side injection. See note 4. High and Low side injection. -4 High and Low Side LO Injection. -4 High and Low Side LO Injection. 8-304 Rev A3 030711 RF2498 Parameter TX (Local Oscillator) Buffer Cellular - CDMA/FM/JCDMA Output Power -11 -8 dBm Output Frequency 600 1078 MHz Output Power -11 -6.5 Output Frequency 1200 2156 MHz Current Consumption 2 mA PCS Output Power -11 -8 dBm Output Frequency 1600 2300 MHz Current Consumption 2 mA NOTE 1. Mixer performance can be changed with external IF load/tuning. NOTE 2. Specifications apply for conditions of LO Divider enabled or disabled. NOTE 3. LO Divider disabled. LO Divider disabled logic conditions: A) BAND SELECT=1; /2 SELECT=Immaterial.B) BAND SELECT=0; /2 SELECT=1 NOTE 4. LO Divider enabled. LO Divider enabled logic conditions: A) BAND SELECT=0; /2 SELECT=0 Single-ended 50 Ω load See note 3. High and Low Side LO Injection. Single-ended 50 Ω load See note 4. High and Low Side LO Injection. Specification Min. Typ. Max. Unit Condition Single-ended 50 Ω load High and Low Side LO Injection Rev A3 030711 8-305 RF2498 Evaluation Board Current Measurement BAND SEL CDMA CellularHigh IIP3 LNA Mode* LNA On, Mixer Preamp On, TX Buffer Off, /2 Off LNA On, Mixer Preamp Off, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp On, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp Off, TX Buffer Off, /2 Off FM/JCDMALow Current LNA Mode LNA On, Mixer Preamp On, TX Buffer Off, /2 Off LNA On, Mixer Preamp Off, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp On, TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp Off, TX Buffer Off, /2 Off CDMA PCS High IIP3 LNA Mode* LNA On, Mixer Preamp On TX Buffer Off, /2 Off* LNA On, Mixer Preamp Off TX Buffer Off, /2 Off* LNA Bypassed, Mixer Preamp On TX Buffer Off, /2 Off LNA Bypassed, Mixer Preamp Off TX Buffer Off, /2 Off GPS LNA On, Mixer On IF SEL ENABLE LNA GAIN MIX GAIN IP SET TX BUFF ENABLE /2 SELECT IDC (mA) 0 0 0 0 1 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 X X 0 0 0 0 1 1 1 1 27.0 22.0 20.5 15.5 0 0 0 0 0 0 0 0 1 1 1 1 1 1 0 0 1 0 1 0 0 0 X X 0 0 0 0 1 1 1 1 25.0 20.0 20.5 15.5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 1 0 1 0 1 1 X X 0 0 0 0 1 1 1 1 27.5 25.5 21.0 16.0 1 0 1 X X 0 0 X 24.0 NOTES: All IDC current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode). TX Buffer On: Add 2mA to total current. /2 Select On: Add 2mA to total current. “X” denotes setting does not impact current. *For Paging mode set IPSET=0. Total current reduced 2mA. 8-306 Rev A3 030711 RF2498 Cascaded Performance (Typical Values for VCC =2.75V) NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode). LNA ON Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) CELL CDMA LNA OFF LNA ON LNA OFF LNA at Max IIP3, IPSET=1 Mixer Preamp On Mixer Preamp Off 7.5 13.0 +8.9 15.0 4.5 +0.6 -2.5 19.5 +17.6 30 40 40 45 15.5 25.0 2.1 -8.5 LO to IF Isolation (dB) 30 30 30 IF1 to RF Isolation (dB) 40 40 40 IF2 to RF Isolation (dB) 40 40 40 LO to LNA IN Isolation (dB) 45 45 45 Total Current (mA) *27.0 20.5 *22.0 NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off. Numbers represent high linearity LNA bias setting IPSET=1. *For Paging mode set IPSET=0. Total current reduced 2mA. FM/JCDMA Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) LNA ON LNA OFF Mixer Preamp On 24.5 2.1 -8.1 7.5 13.0 +8.9 LNA ON LNA OFF Mixer Preamp Off 14.5 4.8 +1.6 -2.5 19.5 +18.4 30 40 40 45 15.5 LO to IF Isolation (dB) 30 30 30 IF1 to RF Isolation (dB) 40 40 40 IF2 to RF Isolation (dB) 40 40 40 LO to LNA IN Isolation (dB) 45 45 45 Total Current (mA) 25.0 20.5 20.0 NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off. Numbers represent low current LNA bias setting IPSET=0. LNA ON Parameter Cascaded: Gain (dB) Noise Figure (dB) Input IP3 (dBm) PCS CDMA LNA OFF LNA ON LNA OFF LNA at Max IIP3, IPSET=1 Mixer Preamp ON Mixer Preamp OFF 7 14 +11.8 17.0 5.0 +0.2 -2.5 22 +19.0 26.5 2.2 -7.5 LO to IF Isolation (dB) 40 40 40 40 IF1 to RF Isolation (dB) 40 40 40 40 IF2 to RF Isolation (dB) 40 40 40 40 LO to LNA IN Isolation (dB) 40 40 40 40 Total Current (mA) *27.5 21.0 *22.5 16.0 NOTE: Assumes 3dB image filter insertion loss. The TX Buffer Enable is off. Div/2 function is off. Numbers represent high linearity LNA bias setting IPSET=1. *For Paging mode set IPSET=0. Total current reduced 2mA. Rev A3 030711 8-307 RF2498 Cascaded Performance (Typical Values for VCC =2.75V) NOTE: All total current numbers include bias circuitry current of 1.5mA to 2.0mA (dependent on mode). Parameter GPS Cascaded: High IIP3 LNA Mode, IPSET=1 Gain (dB) 35.5 Noise Figure (dB) 1.6 Input IP3 (dBm) -23.0 Total Current (mA) 24 NOTE: Assumes 1.5dB image filter insertion loss. The TX Buffer Enable is off. /2 Select is off. IPSET=0 34.5 1.6 -22.0 22 Cellular CDMA Gain Control Mode LNA GAIN MIX GAIN Comments High Gain 1 1 IMD Test 1 and 2 Mid Gain 1 0 IMD Test 3 and 4 Low Gain 0 1 IMD Test 5 and 6 option 1 Ultra Low Gain 0 0 IMD test 5 and 6 option 2 Note: Contact RFMD for Application note on gain control PCBA layout and software recommendations. 8-308 Rev A3 030711 RF2498 Pin 1 Function GPS+ Type Description AO GPS IF output. Open collector. Interface Schematic GPS+ GPS- 2 3 GPSCDMA+ AO AO GPS IF output. Open collector. CDMA IF output. Open collector. See pin 1. CDMA+ CDMA- 4 5 CDMAFM+ AO AO CDMA IF output. Open collector. FM IF output. Open collector. “Current combiner” IF interface to SAW filter recommended. (See “IF Output Matching Network” section.) See pin 3. FM+ FM- 6 7 8 FMVCC2 LO IN AO P AI FM IF output. Open collector. “Current combiner” IF interface to SAW filter recommended. (See “IF Output Matching Network” section.) VCC connection for internal LO amplifiers. Internal RF bypass capacitor. External bypass capacitor between 1nF and 47nF required. LO single-end input. Matched to 50 Ω. See pin 5. LO IN 70 Ω 9 10 LO OUT /2 SELECT AO DI LO output. Internal DC block. Logic input. Low enables /2 circuitry in cellular mode. The divider is disabled when BAND SEL (pin 27) is high, regardless of the state of pin 10. The divider can only be enabled when BAND SEL is low and pin10 is low. Pin 10 can be tied to a low state allowing BANDSEL (pin 27) to control the LO divider function, if using a single LO input source. Logic input. High enables TX LO output buffer amplifiers. See pin 11. 11 TX BUFF ENABLE PCS RFA VCC PCS MIX IN DI TX BUF 12 13 P AI VCC connection for PCS mixer preamplifier. PCS mixer RF single-end input. PCS MIX IN 14 CELL MIX IN AI Cellular mixer RF single-end input. Matched to 50 Ω. CELL MIX IN Rev A3 030711 8-309 RF2498 Pin 15 Function MIX GAIN Type Description Interface Schematic DI Logic input. Logic high turns on PCS or cellular mixer preamp and provides maximum gain. Logic low will bypass the PCS and cellular mixer preamp. MIX GAIN 16 ENABLE DI Logic input. Low level powers down the IC. ENABLE 17 LNA GAIN DI Logic input. High activates cellular or PCS LNAs. Low selects LNA bypass mode for both bands. LNA GAIN 18 19 20 CELL LNA OUT CELL LNA EMITTER CELL LNA IN AO AO AI Cellular LNA output. Simple external L-C components required for matching and VCC supply. Cellular LNA emitter. A small inductor connects this pin to ground. Cellular LNA gain can be adjusted by the inductance. Cellular LNA input. See pin 20. See pin 20. VCC CELL LNA OUT CELL LNA IN CELL LNA EMITTER 21 PCS LNA OUT AO PCS LNA output. Simple external L-C components required for matching and VCC supply. PCS LNA IN VCC PCS LNA OUT 22 IP SET DI 23 24 PCS LNA IN GPS LNA IN AI AI Logic input. High selects high IIP3 LNA “boost” modes for GPS, cellular and PCS CDMA paths. Low selects “normal” IP SET LNA IIP3 mode for GPS, cellular and PCS CDMA paths. Bias setting resistor at pin 31 allows for the adjustment of LNA IIP3 in boost mode. PCS LNA input. For best performance, simple external match- See pin 21. ing required. VCC GPS LNA input. For best performance, simple external matching required. GPS LNA IN GPS LNA OUT 25 26 GPS LNA OUT IF SEL AO DI GPS LNA output. Simple external L-C components required for matching and VCC supply. Logic input. High selects CDMA IF outputs; low selects FM or GPS IF outputs. See pin 24. IF SEL 27 BAND SEL DI Logic input. High level selects PCS or GPS band; low level selects cellular band. The LO divider circuitry is disabled when BAND SEL is high, regardless of the state of pin 10 (/2 SELECT). When BAND SEL is low, pin 10 can be selected high or low. If using a single LO input, pin 10 can be tied to a low state allowing BAND SEL to control the LO divider function. BAND SEL 8-310 Rev A3 030711 RF2498 Pin 28 Function Type Description GPS MIX IN AI GPS mixer RF single-end input. Interface Schematic GPS MIX IN 29 VCC1 P 30 31 32 Pkg Base Legend: ISET1 ISET2 ISET3 GND AO AO AO P DC supply for internal reference, logic control, cellular mixer preamp, and GPS mixer preamp (PCS mixer preamp has its’ own DC supply, PCS_RFA_VCC). External bypass capacitor between 1nF and 47nF required. Resistor for internal voltage reference setting. Recommended value 5.1kΩ. Resistor to ground sets the LNA current in boost mode (all three LNAs). Higher resistance results in lower current. Resistor to ground sets preamp and mixer currents in all bands. Higher resistance results in lower currents. Ground connection. The backside of the package should be soldered to a top side ground pad which is connected to the ground plane with multiple vias. DI=Digital Input from Baseband Chip AI=Analog Input AO=Analog Output P=VCC or GND ISET Pins ISET1 sets the internal reference voltage for the bias control circuits to all functional blocks. An external resistor of 5.1kΩ to ground is required. We do not recommend adjusting this resistor value. This resistor is pulled out to allow for a higher precision off chip value and not as a significant tuning adjustment. ISET2 sets the DC current through the LNAs in all bands when IPSET is high. Higher resistance to ground results in lower current through the LNA. Increasing the LNA current will improve the IIP3 of the LNA and slightly increase gain in all modes. NF typically will get worse as you increase current. Increasing the LNA current in one mode, i.e. Cellular, will also increase the LNA current for the high IPSET state for PCS and the GPS LNAs as well. ISET3 sets the DC current through the mixer and mixer preamplifier for all bands. Higher resistance to ground results in lower current. Lower current will improve mixer NF but will degrade IIP3. Mixer and the mixer preamp gain is not significantly changed with current. Rev A3 030711 8-311 RF2498 Application Schematic VCC BAND SEL IF SEL 4 GND 5 1 GND IN GND 2 OUT GND 6 33 nH 3 See Note 13 GPS RF Saw 15 Ω See Note 11 6.8 nH See Note 14 TBD GPS IF VCC TBD 33 nF See Note 4 VCC 18 nH See Notes 12 and 15 See Note 10 See Note 1 See Note 2 See Note 3 1.0 pF 5.1 kΩ GPS LNA IN See Note 4 7.5 kΩ TBD TBD TBD 20 kΩ 32 1 TBD TBD TBD TBD 31 30 29 28 27 26 25 24 2.7 nH See Notes 14 and 15 See Notes 7 and 15 See Note 10 33 nF 33 nH 1.2 nH See Notes 14 and 15 0.75 pF PCS LNA IN 2 VCC 23 33 nF See Note 4 CDMA+ CDMA- 10 9 4 5 TBD CDMA IF SAW 3 22 4.7 nH See Note 11 See Notes 12 and 15 IP SET VCC TBD TBD 4 21 10 Ω 5 TBD /2 6 FM+ FMVCC 10 9 4 5 20 See Notes 14 and 15 2.7 nH CELL LNA IN 19 1.2 nH 33 nF See Note 4 TBD TBD TBD TBD 7 33 nH See Notes 7 and 15 18 See Notes 6 and 15 FM IF SAW 8 9 10 11 12 13 14 15 16 17 VCC 10 nH See Notes 12 and 15 VCC LNA GAIN LO IN 2.2 nH LO OUT DIV EN TX BUF EN 3.3 nH See Note 8 OUT ENABLE See Note 14 MIX GAIN See Note 4 33 nF 1.2 pF 6 3 5 VCC GND GND GND GND 4 1 200 Ω VCC See Note 9 Cell RF Saw 2 IN 2.4 pF See Note 14 1 pF See Note 4 6 3 OUT TBD TBD 33 nF 5 GND GND GND GND 4 1 2 See Note 8 PCS RF Saw IN 33 nF See Note 4 Note: If any functional blocks are not being used, the unused pins can be left with no connection. Layout Note: To minimize losses and radiation, the RF signal traces should be as short as possible. The IF+ and IF- outputs traces should be symmetrical. All bypass capacitors and matching capacitors must have a ground via very close to the capacitor. Each capacitor should have its own ground via. All traces should be 50 Ω transmission lines. Position inductors to reduce coupling (see note 15). NOTES: 1. This resistor sets mixer preamp and mixer currents in all bands. Lowering the resistance results in higher currents. 2. This resistor sets LNA currents of all bands in boost mode. Increasing the resistor value results in lower currents. 3. Sets internal bias voltage. Recommend 5.1 kΩ. 4. DC blocking capacitor. 5. PCS LNA Input Matching. Optimize for NF. 6. Determines trade off between IIP3 and Gain. Higher value inductor means lower gain and higher IIP3. 7. Cell/PCS LNA Input Matching for optimum IIP3. Low impedance path to ground at low frequency for optimum IIP3. 8. For cell and PCS mixer input matching. 9. PCS Interstage matching. As the value of the inductance is increased, the PCS mixer preamp gain will decrease and the IIP3 will increase and vice versa. 10. For optimum NF and input matching. As the value of the capacitance is increased, the NF will become worse. 11. To optimize performance over temperature and bias. 12. For output matching and a DC supply bias choke. 13. GPS mixer input matching for optimum IIP3. Low impedance path to ground at low frequency for optimum IIP3. 14. Input or Output matching. 15. Coupling of coils on the input, output, and emitter (where applicable) of any LNA should be minimized to reduce the risk of oscillation. We recommend separating the inductors and/or positioning them 90 o relative to each other. NOTE: IF output matching component values are dependent on board layout, IF SAW filter and the IF frequency selected. Please contact RFMD application engineering for assistance with IF output matching. 8-312 Rev A3 030711 RF2498 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) C40 33 nF 5 GND GND L13 33 nH C42 33 nF FL6 2 50 Ω µstrip J14 GPS MIX IN 4 OUT GND C41 DNI GND 3 1 IN GPS RF Saw J1 GPS IF 50 Ω µstrip C4 6.8 pF C21 VCC 100 pF L4 180 nH BAND SEL L10 120 nH R1 5.6 kΩ C34 DNI C27 6.8 pF R5 7.5 kΩ L6 180 nH C39 6.8 pF 32 C12 DNI C10 DNI L2 DNI C11 FL2 10 DNI 9 4 5 6 C48 DNI L19 6.8 nH L20 18 nH C50 33 nF R8 10 Ω C24 100 pF VCC L5 33 nF 50 Ω µstrip J13 GPS LNA OUT IF SEL J2 CDMA IF 50 Ω µstrip C2 33 nF C6 5.1 pF C17 DNI L26 DNI C22 100 pF C31 DNI VCC C43 33 nF R4 20 kΩ R6 5.1 kΩ VCC C32 2.7 nH L23 DNI C19 1.0 pF 50 Ω µstrip J12 GPS LNA IN 31 30 29 28 27 26 25 24 C62 33 nF 1 CDMA IF SAW R11 1.2 nH L25 33 nH C70 0.75 pF VCC 50 Ω µstrip L7 DNI L11 120 nH R2 10 kΩ C35 DNI C28 6.8 pF 2 23 J11 PCS LNA IN 3 C37 6.8 pF 22 IP SET 4 21 C64 33 nF L22 4.7 nH L27 2.7 nH R9 10 Ω C26 100 pF 50 Ω µstrip J10 PCS LNA OUT J9 CELL LNA IN J3 FM IF 50 Ω µstrip C3 33 nF 10 4 5 9 C5 6.2 pF C18 DNI L14 DNI C30 DNI C23 100 pF VCC L8 150 nH L12 120 nH R3 24 kΩ C36 DNI C38 6.8 pF L9 DNI C44 33 nF C29 6.8 pF 5 20 L16 33 nH L24 1.2 nH 18 C63 33 nF FL3 /2 6 19 50 Ω µstrip C15 DNI C13 DNI L3 DNI C14 DNI 7 IF SAW 8 9 10 11 12 13 14 15 16 17 L21 10 nH ENABLE MIX GAIN LNA GAIN C69 2.4 pF 2498310, Rev. 1 C25 100 pF VCC VCC J4 LO IN J5 LO OUT 50 Ω µstrip R7 DNI 50 Ω µstrip C1 DNI DIV EN TX BUF EN L17 2.2 nH 50 Ω µstrip J8 CELL LNA OUT C8 33 nF C61 33 nF L15 1.2 pF R10 0Ω C9 33 nF C56 DNI 5 6 3 OUT FL4 GND GND 4 1 GND GND R12 200 Ω C33 33 nF J6 PCS MIX IN 50 Ω µstrip L18 3.3 nH VCC C59 DNI 5 2 Cell RF Saw C58 DNI 50 Ω µstrip IN J7 CELL MIX IN FL5 4 1 GND OUT GND GND GND C66 DNI IN 2 *IF FREQ = 184 MHz P1-1 C45 33 nF P1-2 C51 33 nF P1 1 2 P1-3 C52 33 nF 3 4 CON4 P1-4 C49 33 nF P2-4 C55 33 nF DIV EN IF SEL IP SET BAND SEL P2-3 C53 33 nF P2-2 C46 33 nF P2-1 C54 33 nF P2 1 2 3 4 CON4 ENABLE TX BUF EN MIX GAIN LNA GAIN C7 33 nF C16 1 pF 6 P3 P3-1 C20 1 µF 1 2 3 CON3 VCC GND GND Rev A3 030711 3 PCS RF SAW 8-313 RF2498 Evaluation Board Layout Board Size 3.0” x 3.0” Board Thickness 0.064”, Board Material FR-4, Multi-Layer 8-314 Rev A3 030711 RF2498 Rev A3 030711 8-315 RF2498 8-316 Rev A3 030711 RF2498 Cellular Band LO Output Power versus LO Input Power -6.0 Cellular Band LO Output Power versus VCC -6.00 (Freq=2128MHz, Divider=0(ON), VCC 2.75V, Temp 25 C) o (Freq=2128MHz, Divider=0 (on), Input Power-4dBm, Temp 25 C) o LB-LO Output Power (dBm) LB-LO Output Power (dBm) -6.5 -6.50 -7.0 -7.00 -7.5 -7.50 -8.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 -8.00 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 LO Input Power (dBm) VCC (V) Cellular Band LO Output Power versus LO-Input Power -6.0 Cellular Band LO Output Power versus VCC -6.00 (Freq=1064MHz, Divider 1(off), VCC=2.75V, Temp 25 C) o (Freq=1064MHz, Divider=1(off), Input Power-4dBm, Temp 25 C) o -6.5 LB-LO Output Power (dBm) -7.5 LB-LO Output Power (dBm) -7.0 -7.00 -8.0 -8.00 -8.5 -9.0 -9.00 -9.5 -10.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 -10.00 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 LO-Input Power (dBm) VCC (V) -6.0 PCS Band LO Output Power versus LO-Input Power (Freq=2144MHz, VCC 2.75V, Temp 25oC) PCS Band LO Output Power versus VCC -6.00 (Freq=2144MHz, Input Power -4dBm, Temp 25 C) o -6.50 HB-LO Output Power (dBm) HB-LO Output Power (dBm) -7.0 -7.00 -7.50 -8.0 -8.00 -8.50 -9.0 -9.00 -9.50 -10.0 -10.0 -8.0 -6.0 -4.0 -2.0 0.0 -10.00 2.70 2.75 2.80 2.85 2.90 2.95 3.00 3.05 3.10 3.15 LO-Input Power (dBm) VCC (V) Rev A3 030711 8-317 RF2498 PCB Design Requirements PCB Surface Finish The PCB surface finish used for RFMD’s qualification process is electroless nickel, immersion gold. Typical thickness is 3 µinch to 8 µinch gold over 180 µinch nickel. PCB Land Pattern Recommendation PCB land patterns are based on IPC-SM-782 standards when possible. The pad pattern shown has been developed and tested for optimized assembly at RFMD; however, it may require some modifications to address company specific assembly processes. The PCB land pattern has been developed to accommodate lead and package tolerances. PCB Metal Land Pattern A = 0.64 x 0.28 (mm) Typ. B = 0.28 x 0.64 (mm) Typ. C = 3.50 (mm) Sq. 3.50 Typ. 0.50 Typ. Pin 32 Dimensions in mm. B Pin 1 B B B B B B B Pin 24 0.50 Typ. A A A A A A A A C A A A A A A A A B B B B B B B B Pin 16 1.75 Typ. 3.50 Typ. 0.55 Typ. 0.55 Typ. 1.75 Typ. Figure 1. PCB Metal Land Pattern (Top View) 8-318 Rev A3 030711 RF2498 PCB Solder Mask Pattern Liquid Photo-Imageable (LPI) solder mask is recommended. The solder mask footprint will match what is shown for the PCB metal land pattern with a 2mil to 3mil expansion to accommodate solder mask registration clearance around all pads. The center-grounding pad shall also have a solder mask clearance. Expansion of the pads to create solder mask clearance can be provided in the master data or requested from the PCB fabrication supplier. A = 0.74 x 0.38 (mm) Typ. B = 0.38 x 0.74 (mm) Typ. C = 3.60 (mm) Sq. 3.50 Typ. 0.50 Typ. Pin 32 Pin 1 Dimensions in mm. BBBBBBBB A A A A A A A A BBBBBBBB C A A A A A A A A Pin 24 0.50 Typ. 1.75 Typ. 3.50 Typ. 0.55 Typ. 0.55 Typ. 1.75 Typ. Pin 16 Figure 2. PCB Solder Mask Pattern (Top View) Rev A3 030711 8-319 RF2498 8-320 Rev A3 030711