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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(R) 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 A
Condition
T = 25C, 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 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
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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 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 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.
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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 load See note 3. High and Low Side LO Injection. Single-ended 50 load See note 4. High and Low Side LO Injection.
Specification Min. Typ. Max.
Unit
Condition
Single-ended 50 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
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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.
See pin 5.
LO IN 70
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.
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
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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 5.1k. 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 5.1k 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
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 k GPS LNA IN
See Note 4
7.5 k TBD TBD TBD
20 k
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
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 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 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 k. 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
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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 strip
J14 GPS MIX IN
4 OUT GND
C41 DNI
GND 3
1 IN
GPS RF Saw
J1 GPS IF
50 strip
C4 6.8 pF C21 VCC 100 pF L4 180 nH BAND SEL L10 120 nH R1 5.6 k C34 DNI C27 6.8 pF R5 7.5 k 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 C24 100 pF VCC L5 33 nF 50 strip J13 GPS LNA OUT
IF SEL
J2 CDMA IF
50 strip
C2 33 nF
C6 5.1 pF C17 DNI L26 DNI C22 100 pF C31 DNI VCC
C43 33 nF R4 20 k R6 5.1 k VCC
C32 2.7 nH L23 DNI C19 1.0 pF 50 strip
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 strip
L7 DNI
L11 120 nH
R2 10 k
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 C26 100 pF 50 strip J10 PCS LNA OUT J9 CELL LNA IN
J3 FM IF
50 strip 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 k 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 strip
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 strip R7 DNI 50 strip C1 DNI DIV EN TX BUF EN
L17 2.2 nH
50 strip
J8 CELL LNA OUT
C8 33 nF
C61 33 nF L15 1.2 pF
R10 0 C9 33 nF
C56 DNI
5 6 3 OUT
FL4
GND GND 4 1
GND GND
R12 200 C33 33 nF J6 PCS MIX IN 50 strip
L18 3.3 nH VCC C59 DNI
5
2
Cell RF Saw
C58 DNI 50 strip
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 F 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 3inch to 8inch gold over 180inch 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

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