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| RF2456 6 Typical Applications * CDMA/FM Cellular Systems * Supports Dual-Mode AMPS/CDMA * Supports Dual-Mode TACS/CDMA * General Purpose Downconverter * Commercial and Consumer Systems * Portable Battery-Powered Equipment CDMA/FM DOWNCONVERTER Product Description The RF2456 is a receiver dual downconverter designed for the receive section of dual-mode CDMA/FM cellular applications. It is designed to downconvert RF signals while providing 13dB gain in CDMA mode, and 7dB gain in FM mode. It also features digital control of IF output selection and power down mode. Noise Figure, IP3, and other specs are designed to be compatible with the IS-95 Interim Standard for CDMA cellular communications. The IC is manufactured on an advanced Silicon Bipolar process and packaged in an SSOP-16. 0.157 0.150 0.012 0.008 0.196 0.189 0.025 -A0.0098 0.0040 6 0.0688 0.0532 0.2440 0.2284 8 MAX 0MIN 0.050 0.016 0.0098 0.0075 NOTES: 1. Shaded lead is Pin 1. 2. All dimensions are excluding mold flash. 3. Lead coplanarity - 0.005 with respect to datum "A". Optimum Technology Matching(R) Applied u Package Style: SSOP-16 Si BJT Si Bi-CMOS GaAs HBT SiGe HBT GaAs MESFET Si CMOS Features * Dual Mode CDMA/AMPS * Dual Mode JCDMA/TACS * Digitally Selectable IF Outputs * 500MHz to 1100MHz Operation * Power Down Mode VCC 1 FM- 2 FM+ 3 GND 4 CDMA+ 5 CDMA- 6 IF SELECT7 PD 8 16 GND 15 GND 14 GND 13 BYP 12 MIXER IN 11 GND 10 LO9 LO+ Ordering Information RF2456 RF2456 PCBA CDMA/FM Downconverter Fully Assembled Evaluation Board Functional Block Diagram RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com Rev B6 010717 6-1 MIXERS RF2456 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 LO Frequency Range IF Frequency Range Conversion Gain Specification Min. Typ. Max. Unit Condition T = 25 C, VCC =3.0V, RF=881MHz, LO=966MHz @ 0dBm, IF1= CDMA, IF2=FM 6 MIXERS 12.5 5 Noise Figure Input VSWR Input IP3 Input P1dB MIX IN to IF1, IF2 Rejection IF1, IF2 Output Freq. Range Output Impedance +3.0 +3.0 200 to 1000 500 to 1100 0.1 to 250 13.0 7 12 13 <1.5:1 <2:1 +3.5 +10.0 -7 -4 35 70 to 100 >1 870 -3 20 15 <2:1 2.5 3.0 18 15 0 MHz MHz MHz dB dB dB dB dBm dBm dBm dBm dB MHz k dBm dB dB IF1, 1k balanced load. IF2, 870 load. IF1 single sideband. IF2 single sideband IF1 with external matching IF2 with external matching IF1 IF2 IF1 IF2 With external IF interface network IF1, balanced, open collector IF2, single ended, with external inductor. LO Input LO Input Range LO IN to RF Input Rejection LO IN to IF1, IF2 Rejection LO Input VSWR -10 IF1 with external matching network IF2 with external matching network 4.0 21 16 5 V mA mA A Power Supply Voltage Current Consumption 2.7 IF1 selected IF2 selected Power down (PD=0) 6-2 Rev B6 010717 RF2456 Pin 1 Function VCC Description Supply Voltage for the mixers, bias circuits, and control logic. External RF and IF bypassing is required. The trace length between the pin and the bypass capacitors should be minimized. The ground side of the bypass capacitors should connect immediately to ground plane. Interface Schematic VCC2 BIAS LO OUT 2 3 IF2IF2+ Same as pin 3, except complimentary output. For typical single ended operation, this pin is connected directly to VCC. FM IF Output pin. This is a balanced output, but is typically used as a single-ended output. The internal circuitry, in conjunction with an external matching/bias inductor to VCC, sets the operating impedance. This inductor is typically incorporated in the matching network between the output and IF filter. The net output impedance, including the external inductor, is about 870 at 85MHz. Because this pin is biased to VCC, a DC blocking capacitor must be used if the IF filter input has a DC path to ground. See Application Schematic. Ground connection. For best performance, keep traces physically short and connect immediately to ground plane. CDMA IF Output pin. This is a balanced output. The internal circuitry, in conjunction with an external matching/bias inductor to VCC, sets the operating impedance. This inductor is typically incorporated in the matching network between the output and IF filter. The net output impedance, including the external inductor, at 85MHz is higher than 1k, even though the part is designed to drive a 1k load. Because this pin is biased to VCC, a DC blocking capacitor must be used if the IF filter input has a DC path to ground. See Application Schematic. Same as pin 5, except complementary output. Control line for IF out select. A logic "low" enables the FM output. A logic "high" enables the CDMA output. The threshold voltage is 1.6V, and the pin draws less than 50A when selected. See pin 3. IF2+ IF2- 8.5 pF 2.1 k 4 5 GND IF 1+ 6 IF1+ GND2 IF11.2 pF 1.2 pF 6 7 IF 1IF SELECT See pin 5. 50 k C1 8 PD Power down pin. A logic "low" turns the part off. A logic "high" (>1.6V) turns the part on. In addition, pin 7 (IF SELECT) should also be taken low during power down. 50 k PD 9 LO IN+ Mixer LO Balanced Input Pin. For single-ended input operation, this pin is used as an input and pin 10 is bypassed to ground. LO IN+ LO IN- 10 11 12 LO INGND MIX IN Same as pin 9 except complementary input. Ground connection for the mixer. For best performance, keep traces physically short and connect immediately to ground plane. Mixer RF Input Pin. This pin is internally DC biased and should be DC blocked if connected to a device with DC present. External matching network sets RF and IF impedance for optimum performance. See pin 9. MIX IN 13 BYP 14 15 16 GND GND GND Internal voltage reference. External RF and IF bypassing is required. The trace length between the pin and the bypass capacitors should be minimized. The ground side of the bypass capacitors should connect immediately to ground plane. Same as pin 4. Same as pin 4. Same as pin 4. Rev B6 010717 6-3 MIXERS RF2456 Application Schematic VCC 1 F 33 nF 1 2 3 4 5 16 15 14 33 nF 13 33 nF 12 11 3.3 pF 10 9 5.6 nH LO IN 33 nF 15 nH 15 nH MIX IN FM SAW Filter FM IF OUT L L CDMA SAW Filter CDMA IF OUT L L 6 7 8 IF SELECT 6 MIXERS PD Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) NOTE: **Core: Fair-Rite Balun #2865002402 L12: 3 turns #30 AWG (Green) L34: 12 turns #32 AWG (Red) One turn = One pass through BOTH holes winding starts and finishes on same end of core. L12 and L34 exit opposite ends of core. P1 P1-1 1 2 3 VCC GND P2-3 P2-1 P2 1 2 3 IF SELECT GND ENABLE 50 strip R3 10 VCC 50 strip C2 10 pF L1 150 nH 2 3 C10 + 1 uF VCC 50 strip R1 33 R2 68 L4 3.3 uH VCC IF SELECT ENABLE 2456400 Rev A 1 C1 33 nF J5 1 16 15 14 13 12 11 10 9 C7 1.5 pF R4 220 L5 8.2 nH C6 33 nF C9 33 nF L7 15 nH IN 2 GND J2 FM IF2 L8* TBD L6 15 nH C5 33 nF C3 9 pF L2 390 nH C4 9 pF 4 5 C8 33 pF 3 OUT F1* DNI 50 strip J1 RF IN J3 CDMA IF1 T1 **XFMER L3 3.3 uH 6 7 8 50 strip J4 LO IN Enable 0 0 1 1 IF Select 0 1 0 1 Stage Off Off FM CDMA 6-4 Rev B6 010717 RF2456 Evaluation Board Layout Board Size 3.070" X 2.928" Board Thickness 0.056", Board Material FR-4 6 MIXERS Rev B6 010717 6-5 RF2456 6 MIXERS 6-6 Rev B6 010717 RF2456 FM Gain versus Temperature over Frequency, 6.8 CDMA Gain versus Temperature over Frequency, 13.7 VCC = 3 V, LO = -3 dBm VCC = 3V, LO = -3 dBm 6.6 13.6 6.4 13.5 Gain (dB) 6.2 FM Gain @ T=-40 6.0 FM Gain @ T=26 FM Gain @ T= 85 5.8 Gain (dB) 13.4 13.3 13.2 CDMA Gain @ T=-40 5.6 13.1 CDMA Gain @ T=26 CDMA Gain @ T= 85 5.4 869.0 874.0 879.0 884.0 889.0 894.0 13.0 869.0 874.0 879.0 884.0 889.0 894.0 Frequency (MHz) Frequency (MHz) FM IIP3 versus Temperature over Frequency, 11.5 11.0 8.0 10.5 10.0 7.0 CDMA IIP3 versus Temperature over Frequency, 9.0 6 MIXERS VCC = 3 V, LO = -3 dBm VCC = 3 V, LO = -3 dBm IIP3 (dBm) 9.5 9.0 8.5 8.0 FM iIP3 @ T=-40 7.5 7.0 869.0 FM iIP3 @ T=26 FM iIP3 @ T= 85 874.0 879.0 884.0 889.0 894.0 IIP3 (dBm) 6.0 CDMA iIP3 @ T=-40 5.0 CDMA iIP3 @ T=26 CDMA iIP3 @ T= 85 4.0 3.0 869.0 874.0 879.0 884.0 889.0 894.0 Frequency (MHz) Frequency (MHz) FM Gain versus Temperature over LO, 6.6 CDMA Gain versus Temperature over LO, 14.0 13.9 13.8 VCC = 3 V, Frequency = 881 MHz VCC = 3 V, Frequency = 881 MHz CDMA Gain @ T=-40 6.4 CDMA Gain @ T=26 CDMA Gain @ T= 85 6.2 13.7 6.0 13.6 13.5 13.4 13.3 5.4 FM Gain @ T=-40 5.2 FM Gain @ T=26 FM Gain @ T= 85 5.0 -6.0 13.2 13.1 13.0 -6.0 Gain (dB) 5.8 5.6 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 Gain (dB) -5.0 -4.0 -3.0 -2.0 -1.0 0.0 Frequency (MHz) LO (dBm) Rev B6 010717 6-7 RF2456 FM IIP3 versus Temperature over LO, 12.0 CDMA IIP3 versus Temperature over LO, 8.0 7.0 6.0 5.0 4.0 VCC = 3 V, Frequency = 881 MHz FM iIP3 @ T=-40 VCC = 3 V, Frequency = 881 MHz 11.5 FM iIP3 @ T=26 FM iIP3 @ T= 85 11.0 10.5 IIP3 (dBm) IIP3 (dBm) 3.0 2.0 1.0 0.0 -1.0 CDMA iIP3 @ T=-40 CDMA iIP3 @ T=26 -2.0 CDMA iIP3 @ T= 85 10.0 9.5 9.0 8.5 8.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 -3.0 -6.0 -5.0 -4.0 -3.0 -2.0 -1.0 0.0 6 6.5 LO (dBm) LO (dBm) FM Gain versus Temperature over VCC, Frequency = 881 MHz, LO = -3 dBm 13.7 CDMA Gain versus Temperature over VCC, Frequency = 881 MHz, LO = -3 dBm MIXERS 6.4 13.6 6.3 6.2 6.1 6.0 5.9 5.8 5.7 5.6 5.5 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 13.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 FM Gain @ T=-40 FM Gain @ T=26 FM Gain @ T= 85 13.1 CDMA Gain @ T=-40 CDMA Gain @ T=26 CDMA Gain @ T= 85 13.5 Gain (dB) Gain (dB) VCC (V) 13.4 13.3 13.2 VCC (V) FM IIP3 versus Temperature over VCC, 12.0 CDMA IIP3 versus Temperature over VCC, 9.0 8.0 Frequency = 881 MHz, LO = -3 dBm Frequency = 881 MHz, LO = -3 dBm 11.0 7.0 10.0 6.0 IIP3 (dBm) IIP3 (dBm) FM iIP3 @ T=-40 FM iIP3 @ T=26 FM iIP3 @ T= 85 5.0 4.0 3.0 2.0 CDMA iIP3 @ T=-40 1.0 0.0 CDMA iIP3 @ T=26 CDMA iIP3 @ T= 85 9.0 8.0 7.0 6.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 4.0 VCC (V) VCC (V) 6-8 Rev B6 010717 |
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