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RF2461
CDMA/FM LOW NOISE AMPLIFIER/MIXER 900MHz DOWNCONVERTER
RoHS Compliant & Pb-Free Product Package: QFN, 20-Pin, 4x4
Features
Complete Receiver Front-End Stepped LNA/Mixer Gain Control Adjustable LNA/Mixer Bias Current Adjustable LNA/Mixer IIP3 Meets IMD Tests with Three Gain States/Two Logic Control Lines
ENABLE IP SET IF SEL VCC2 16 LO IN 17
20
19
18
LNA GAIN
1
15
IF2+
MIX GAIN
2
14
IF2-
LNA IN
3
13
BYPASS
Applications
CDMA/FM (AMPS) Systems Dual-Mode TACS/JCDMA Systems General Purpose Downconverter Commercial and Consumer Systems Portable Battery-Powered Equipment
VCC1
4
12
IF1+
GND1B
5
11
IF1-
6 LNA OUT
7 ISET2
8 ISET1
9 GND3B
10 MIX IN
Functional Block Diagram
Product Description
The RF2461 is a receiver front-end designed for the receive section of dual-mode CDMA/FM cellular applications. It is designed to amplify and downconvert RF signals, while providing 30dB of stepped gain control range. Features include digital control of LNA gain, mixer gain, and power down mode. Another feature of the chip is adjustable IIP3 of the LNA and mixer using an off-chip current setting resistor. Noise figure, IP3, and gain are designed to be compatible with the IS-98B interim standard for CDMA cellular communications. The IC is manufactured on an advanced Silicon Germanium Bi-CMOS process and is assembled in a 4mmx4mm, 20-pin, QFN package.
Ordering Information
RF2461CDMA/FM Low Noise Amplifier/Mixer 900MHz Downconverter
RF2461PCBA-41X
Fully Assembled Evaluation Board
Optimum Technology Matching(R) Applied
GaAs HBT GaAs MESFET InGaP HBT SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT
RF MICRO DEVICES(R), RFMD(R), Optimum Technology Matching(R), Enabling Wireless ConnectivityTM, PowerStar(R), POLARISTM TOTAL RADIOTM and UltimateBlueTM are trademarks of RFMD, LLC. BLUETOOTH is a trademark owned by Bluetooth SIG, Inc., U.S.A. and licensed for use by RFMD. All other trade names, trademarks and registered trademarks are the property of their respective owners. (c)2006, RF Micro Devices, Inc.
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2461
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.
Exceeding any one or a combination of the Absolute Maximum Rating conditions may cause permanent damage to the device. Extended application of Absolute Maximum Rating conditions to the device may reduce device reliability. Specified typical performance or functional operation of the device under Absolute Maximum Rating conditions is not implied. RoHS status based on EUDirective2002/95/EC (at time of this document revision). The information in this publication is believed to be accurate and reliable. However, no responsibility is assumed by RF Micro Devices, Inc. ("RFMD") for its use, nor for any infringement of patents, or other rights of third parties, resulting from its use. No license is granted by implication or otherwise under any patent or patent rights of RFMD. RFMD reserves the right to change component circuitry, recommended application circuitry and specifications at any time without prior notice.
Parameter
Overall
RF Frequency Range LO Frequency Range IF Frequency Range Power Down Current
Min.
800 700 0.1
Specification Typ.
869 to 894 832 to 870 954 to 979 722 to 760
Max.
1000 1000 250 10
Unit
MHz MHz MHz A LNA Gain=1 dB dB dB dB dBm dBm mA mA IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 IPSET=1 IPSET=0 LNA Gain=0
Condition
T = 25C, VCC =3.0V
LNA - CDMA/JCDMA
Gain Noise Figure Input IP3 Current +9.0 +7.0 14.0 13.5 15.0 14.5 1.8 1.8 +11.0 +9.0 6.5 5.0 16.0 15.0 2 2
LNA Bypass CDMA/JCDMA
Gain Noise Figure Input IP3 Current +16.0 -8 -6 6 +18.0 0 8 dB dB dBm mA
Mixer - CDMA
Gain Noise Figure Input IP3 Current +3.0 +13.0 13 4 14.5 5.8 5.5 13 +4.0 +14.0 21 18 7 14 dB dB dB dB dBm dBm mA mA
3k balanced load. IIP3 is adjustable. Decreasing R4/R5 will increase IIP3. LO=965MHz@-10dBm, IF=85.38MHz Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 3k balanced load. IIP3 is adjustable. Decreasing R4/R5 will increase IIP3. LOIN=741MHz@-4dBm, IF=110MHz
Mixer - JCDMA
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Rev B6 DS060925
RF2461
Gain Noise Figure Input IP3 Current +2.0 +10.0 12 2.5 13 4.0 5.5 13 +3.0 +12.0 24 21 7 14 dB dB dB dB dBm dBm mA mA Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0 Mixer Preamp ON, Mix Gain=1 Mixer Preamp OFF, Mix Gain=0
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2461
Parameter
Local Oscillator Input
Input Level LO to IF Isolation LO to LNA Isolation -10 -70 -60 2.65 3.0 3.15 dBm dB dB V LNA High Gain/Mixer High Gain. LNA Gain=1, Mix Gain=1. Assumes 3dB Image filter insertion loss. 23.5 -11 26 2.4 -9 26 0 28 dB dB dBm mA LNA High Gain/Mixer Low Gain. LNA Gain=1, Mix Gain=0. Assumes 3dB Image filter insertion loss. 16.5 4.9 0 23 dB dB dBm mA LNA Low Gain/Mixer High Gain. LNA Gain=0, Mix Gain=1. Assumes 3dB Image filter insertion loss. 4 15.5 11.8 22 dB dB dBm mA LNA Low Gain/Mixer Low Gain. LNA Gain=0, Mix Gain=0. Assumes 3dB Image filter insertion loss. -7 +14 -4.5 22.5 +20 18 40 -3 dB dB dBm mA Any gain state.
Min.
Specification Typ.
Max.
Unit
Condition
Power Supply
Voltage
Cascade High Gain Mode
Gain Noise Figure Input IP3 Current
Cascade Mid Gain Mode
Gain Noise Figure Input IP3 Current
Cascade Low Gain Mode
Gain Noise Figure Input IP3 Current
Cascade Ultra-Low Gain Mode
Gain Noise Figure Input IP3 Current
Cellular CDMA, IPSET=1
Mode
High Gain Mid Gain Low Gain Ultra-Low Gain
LNA GAIN
1 1 0 0
MIX GAIN
1 0 1 0 Recommended for IMD Tests 1 and 2 Recommended for IMD Tests 3 and 4 Recommended for IMD Tests 5 and 6 Alternative Lowest Current Mode for IMD Tests 5 and 6
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Rev B6 DS060925
RF2461
Pin 1 Function LNA GAIN Description
Controls the bypass feature of the LNA. A logic low (<1.0V) selects the bypass mode. A logic high (>2.0V) turns on the LNA. Controls the bypass feature of the mixer preamp. A logic low (<1.0V) selects the bypass mode. A logic high (>2.0V) turns on the preamppreamp. LNA input pin.
Interface Schematic
LNA GAIN
2 3
MIX GAIN LNA IN
MIX GAIN
LNA O U T
L N A IN
G N D 1B
4 5
VCC1 GND1B
VCC pin for all circuits except the LO. Buffer/bias circuitry. LNA emitter. This pin provides the DC path to ground for the LNA. A lumped element or a transmission line inductor can be placed between this pin and ground to degenerate the LNA. This will decrease the gain and increase the IP3 of the LNA. As the value of inductance is increased, these effects will become more pronounced. LNA output pin. An external resistor R2 connected to this pin sets the current of the preamp and the mixer. An external resistor R3 connected to this pin sets the current of the LNA when IP SET is high (see pin 19). Ground pin for preamp circuit. A 3.3nH inductor is used between pin 9 and ground to degenerate the mixer preamp. Degenerating the preamp will reduce the gain, increase the IP3 and affect the preamp input impedance.
6 7 8 9
LNA OUT ISET2 ISET1 GND3B
See pin 3.
VCC2
M IX IN
G N D3B
10 11 12
MIX IN IF1IF1+
Mixer preamp input pin. Second differential output pin for the first mixer. First differential output pin for the first mixer. Open collector. A current combiner external network performs a differential to single-ended conversion and sets the output impedance. A DC blocking cap must be present if the IF filter input has a DC path to ground. Mixer (IF2+ and IF-) needs to "see" a differential impedance between 2k to 4k.
See pin 9. See pin 12.
IF1IF1+
13 14
BYPASS IF2-
Bypass pin for the LO bias reference. Second differential output pin for the second mixer. See pin 15.
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2461
Pin 15 Function IF2+ Description
First differential output pin for the second mixer. Open collector. A current combiner external network performs a differential to single-ended conversion and sets the output impedance. A DC blocking cap must be present if the IF filter input has a DC path to ground. Mixer (IF2+ and IF2-) needs to "see" a differential impedance between 2k to 4k.
Interface Schematic
IF2IF2+
16 17
VCC2 LO IN
VCC pin for the LO buffer/bias circuitry. LO limiter input pin.
LO IN
18
ENABLE
This pin is used to enable or disable the RF2461. A logic high (>2.0V) enables the circuitry. A logic low (<1.0V) disables the circuitry.
ENABLE
19 20
IP SET IF SEL
Controls the setting of the LNA current. A logic low (<1.0V) selects the internal resistance (49.5k), resulting in an LNA current of 5mA. A logic high (>2.0V) selects the external resistance at pin 8. Determines which IF port is active. A logic low (<1.0V) activates IF1 and deactivates IF2. A logic high (>2.0V) activates IF2 and deactivates IF1. Mixers are identical. Either IF output may be used for CDMA or AMPS applications. 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.
IP SET
IF SEL
Pkg Base
GND
Package Drawing QFN, 20-PIN, 4x4
-A0.15 C A
4.00
2 PLCS
1.00 0.90
0.15 C B
0.05 C
0.05
2 PLCS
3.75
4.00
Dimensions in mm.
12 MAX
0.15 C
2 PLCS
-B-
-C-
3.75
0.15 C
2 PLCS
Note orientation of package.
0.10 M C A B
0.20 0.60 0.24 TYP
2
0.65 0.30
4 PLCS
NOTES: 1 Shaded lead is Pin 1. Dimension applies to plated terminal: 2 to be measured between 0.02 mm and 0.25 mm from terminal end.
2.10 SQ.
0.75 0.50 0.50
0.23 0.13
4 PLCS
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Rev B6 DS060925
RF2461
Application Schematic
NOTE: Microstrip Inductor, Z0 = 50 , L = 102 mils suggested compared values.
See Note 7
100 pF 56
See Note 8
VCC2 VCC1 L2 100 pF
See Note 8
LO IN ENABLE IP SET IF SEL LNA GAIN 1 MIX GAIN
See Note 11
C2
L
IF2+ IF2F i l t e r
20
19
18
17
16 L1 15 R C1
4.3 nH
2 33 nF
14
C1
LNA IN 16 nH
See Note 12
3
13
BYPASS 100 pF
4 100 pF
See Note 8
12
See Note 8
50 strip L=130 mils W=12 mils Z0=50
See Note 2
VCC1
5
11 L1 6 7 8 9 10 R
C1
C1 0.1 F 51 * *This resistor improves NF and IIP3 for VCC = 3.0 V. VCC1
See Note 8 See Note 9
100 pF 22 k 50 strip 620
See Note 10 See Note 4
47 k
See Note 5
3.3 nH
See Note 3
33 nF
See Note 1
C2
L IF+ IFF i l t 100 pF See e Note 8 r VCC1
7.5 nH
L2
See Note 11
4 pF
47 nH
See Note 6
F NOTES: i 1. DC blocking capacitor. l 2. LNA emitter degenerator. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase. t 3. Mixer preamp degeneration inductor. As the value of inductance is increased, the gain will decrease, and the IIP3 will increase. e 4. An external resistor connected to this pin sets the current of the preamp and the mixer. Higher resistance to ground results in lower current. See chart at end of datasheet. r 5. An external resistor connected to this pin sets the current of the LNA when IPSET is high. Higher resistance to ground results in lower current. See chart at end of datasheet. 6. Mixer input matching inductor. 7. LO input matching resistor. 8. Bypass capacitor. 9. LNA output matching and bias choke. 10. For stability of the LNA. 11. LNA input and output matching. 12. Low pass path to ground for two-tone beat frequency for optimum IIP3 of LNA.
Output Interface Network
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
7 of 14
RF2461
L1, C1, and R form a current combiner which performs a differential to single-ended conversion at the IF frequency and sets the output impedance. In most cases, the resonance frequency is independent of R and can be set according to the following equation: Where CEQ is the equivalent stray capacitance and capac1 fIF = itance looking into pins 11 and 12. An average value to L1 (C1 + CEQ) 2 2 use for CEQ is 2.5pF to 3pF. R can then be used to set the output impedance according to the following equation: L2 and C2 serve dual purposes. L2 serves as an output 1 R= ( - 1 ) -1 bias choke, and C2 serves as a series DC block. 4 R OU T RP where ROUT is the desired output impedance and RP is the parasitic equivalent parallel resistance of L1. C1 should be chosen as high as possible (not greater than 15pF), while maintaining an RP of L1 that allows for the desired ROUT. In addition, L2 and C2 may be chosen to form an impedance matching network if the input impedance of the IF filter is not equal to ROUT. Otherwise, L2 is chosen to be large, and C2 is chosen to be large if a DC path to ground is present in the IF filter, or omitted if the filter is DC blocked.
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7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
Rev B6 DS060925
RF2461
Evaluation Board Schematic - CDMA LO@965MHz, RF@880MHz, IF@85MHz
(Download Bill of Materials from www.rfmd.com.)
P1 P1-1 1 2 P1-3 3 CON3 ENABLE IP SET IF SEL 20 LNA GAIN 1 MIX GAIN 329 pS Electrical Delay 0.10 dB Line Loss J2 LNA IN 50 strip 2 50 strip L1 4.3 nH L2 16 nH C1 33 nF C2 100 pF VCC1 50 strip 14 15 19 18 17 16 50 strip MIX GAIN GND LNA GAIN P2-1 P2-2 P2-3 P2 1 2 3 CON3 IF SEL IP SET ENABLE P3-3 P3-1 P3 1 2 3 CON3 50 strip 50 strip L9 470 nH R5 10 k 50 strip C14 10 pF VCC1 GND VCC2 447 pS Electrical Delay 0.13 dB Line Loss J1 LO IN R6 56 50 strip
C16 100 pF
VCC2 VCC1 L8 390 nH C15 100 pF 348 pS Electrical Delay @ 110 MHz 0.03 dB Line Loss J6 IF2 OUT 50 strip
C13 11 pF
C12 11 pF BYPASS 50 strip C11 100 pF
3
13
4 50 strip L=130 mils W=12 mils Z0=50
12
5
11 50 strip L6 470 nH R4 10 k C9 11 pF
C10 11 pF
6
7
8
9
10
VCC1 498 pS Electrical Delay 0.15 dB Line Loss J3 LNA OUT 50 strip
R14 51
C3 0.1 F
C4 100 pF L3 7.5 nH C5 4 pF R1 620 50 strip
50 strip R2 18 k R3 L4 47 k 3.3 nH 50 strip L7 390 nH C7 100 pF 50 strip C6 33 nF 50 strip L5 47 nH
C8 10 pF
348 pS Electrical Delay @ 110 MHz 0.03 dB Line Loss J5 IF1 OUT 50 strip VCC1
Note: R14 improves NF and IIP3 for VCC = 3.0 V
50 strip
320 pS Electrical Delay @ 880 MHz 0.10 dB Line Loss J4 MIXER IN
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
9 of 14
RF2461
Evaluation Board Schematic - JCDMA LO@741MHz, RF@851MHz, IF@110MHz
P1 P1-1 1 2 P1-3 3 CON3 ENABLE IP SET IF SEL 20 LNA GAIN 1 MIX GAIN 329 pS Electrical Delay 0.10 dB Line Loss J2 LNA IN 50 strip 2 50 strip L1 4.3 nH L2 16 nH C1 33 nF C2 100 pF VCC1 50 strip 14 15 19 18 17 16 50 strip MIX GAIN GND LNA GAIN P2-1 P2-2 P2-3 P2 1 2 3 CON3 IF SEL IP SET ENABLE P3-3 P3-1 P3 1 2 3 CON3 50 strip 50 strip L9 330 nH R5 4.3 k 50 strip C14 7 pF VCC1 GND VCC2 447 pS Electrical Delay 0.13 dB Line Loss J1 LO IN R6 56 50 strip VCC2 C16 100 pF VCC1 L8 270 nH C15 100 pF 348 pS Electrical Delay @ 110 MHz 0.03 dB Line Loss J6 IF2 OUT 50 strip
C13 9 pF
C12 10 pF BYPASS 50 strip C11 100 pF
3
13
4 50 strip L=130 mils W=12 mils Z0=50
12
5
11 50 strip L6 330 nH R4 4.3 k C9 9 pF
C10 11 pF
6
7
8
9
10
VCC1 498 pS Electrical Delay 0.15 dB Line Loss J3 LNA OUT 50 strip
R14 51
C3 0.1 F
C4 100 pF L3 7.5 nH C5 4 pF R1 620 50 strip
50 strip R2 18 k R3 L4 33 k 7.5 nH 50 strip L7 270 nH C7 100 pF 50 strip C6 33 nF 50 strip L5 30 nH
C8 7 pF
348 pS Electrical Delay @ 110 MHz 0.03 dB Line Loss J5 IF1 OUT 50 strip VCC1
Note: R14 improves NF and IIP3 for VCC = 3.0 V
50 strip
320 pS Electrical Delay @ 880 MHz 0.10 dB Line Loss J4 MIXER IN
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Rev B6 DS060925
RF2461
Evaluation Board Layout Board Size 2.0" x 2.0"
Board Thickness 0.031", Board Material FR-4, Multi-Layer
Assembly Top
Power Plane 1
Power Plane 2
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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RF2461
Back
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Rev B6 DS060925
RF2461
LNA Gain, Noise Figure and IIP3 versus ICC 16.0
Mixer Gain, Noise Figure and IIP3 versus ICC 15.0 25.00 20.00 15.00 5.0
LNA Only (LNA High Gain)
Mixer (Mixer High Gain, LO=-7dBm)
10.00
14.0
10.0
Gain and Noise Figure (dB)
Gain and Noise Figure (dB)
12.0
5.00
10.00 5.00 0.00 0.00 -5.00 -10.00 Gain (dB) NF (dB) -15.00 -20.00 10.00 15.00 20.00 25.00 30.00 35.00 IIP3 (dBm) -10.00 40.00 -5.00
10.0
IIP3 (dBm)
0.0 8.0 -5.0 6.0 Gain (dB) NF (dB) 4.0 IIP3 (dBm) -15.0 -10.0
2.0
0.0 0.0 2.0 4.0 6.0 8.0 10.0 12.0 14.0
-20.0 16.0
ICC (mA)
ICC (mA)
200.0 180.0 160.0 140.0 120.0 100.0 80.0 60.0 40.0 20.0 0.0 0.0 2.0
Resistor (R3) versus ICC (mA) LNA Only (LNA High Gain)
R3 (kohm)
200.0 180.0 160.0 140.0
Resistor (R2) versus ICC - Mixer (Mixer High Gain, LO=2170@-7dBm)
R2 (kohm)
Resistor R2 ( k)
Resistor R3 (k)
120.0 100.0 80.0 60.0 40.0 20.0 0.0
4.0
6.0
8.0
10.0
12.0
14.0
16.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
ICC (mA)
ICC (mA)
Condition T=25oC, VCC=2.75V, RF=880 and 881MHz, LO=965MHz @-10dBm
Rev B6 DS060925
7628 Thorndike Road, Greensboro, NC 27409-9421 * For sales or technical support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.
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IIP3 (dBm)
RF2461
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Rev B6 DS060925

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