RF2909 11 3V 915MHZ SPREAD-SPECTRUM TRANSMITTER IC Typical Applications • Direct Sequence Spread Spectrum • GMSK, QPSK, DQPSK, QAM Modulation • Spread Spectrum Cordless Phones • 915MHz ISM Applications • Portable Battery Powered Equipment Product Description R F2 94 2 .025 .244 .228 SiGe HBT Si CMOS ad ed 24 I SIG Q SIG 1 8°MAX 0°MIN +45° -45° GND1 3 21 GND6 U pg r Σ 22 NC LO IN+ 5 20 GND5 LO IN- 6 19 RF OUT 18 GND4 VCC1 8 17 GND3 S ee NC 7 VCC2 10 APC 12 DC BIAS 15 TX PD PWR CTRL 14 PC 2 13 PC1 Functional Block Diagram Rev B1 010904 .010 .008 Package Style: SSOP-24 11 Features • 2.7V to 5V Power Supply • 1mW, 10mW, 70mW Digital Output Power • 20dB Analog Power Control Range • Excellent Phase & Amplitude Balance • Compatible with the RF2908 16 PLLON GND2 9 INSTGT 11 .050 .016 23 I REF Q REF 2 NC 4 .069 .053 TRANSCEIVERS GaAs MESFET P üSi Bi-CMOS GaAs HBT .010 .004 .012 .008 .344 .337 Optimum Technology Matching® Applied Si BJT .033 1 ro du ct The RF2909 is a monolithic integrated transmitter IC capable of universal direct modulation. The quadrature modulator allows for a variety of modulation formats and compound carriers. The transmitter has two power control modes. Two inputs can be controlled digitally for stepping output power 1mW, 10mW, or 70mW output power. Or, the output level can be adjusted by an analog input from 1mW to 80mW. The quadrature mixers have differential inputs, and are internally biased; a DC blocking capacitor is required if external DC levels are present. The LO is split with a passive network tuned for 915MHz. .157 .150 Ordering Information RF2909 RF2909 PCBA 3V 915MHz Spread-Spectrum Transmitter IC Fully Assembled Evaluation Board RF Micro Devices, Inc. 7628 Thorndike Road Greensboro, NC 27409, USA Tel (336) 664 1233 Fax (336) 664 0454 http://www.rfmd.com 11-103 RF2909 Absolute Maximum Ratings Parameter Supply Voltage Power Down Voltage (VPD) Input LO and RF Levels Operating Ambient Temperature Storage Temperature Parameter Rating Unit -0.5 to +5.5 VDD +0.4 +6 -40 to +85 -40 to +150 VDC VDC dBm °C °C Specification Min. Typ. Max. 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). Unit Carrier Input (LO IN) Frequency Range Power Level Input Impedance 100 902-928 -10 50 1100 MHz dBm Ω DC 10 1.7 500 500 MHz V mVp Condition T=25 °C, VDD =3.3V Phase shift optimized for 915MHz Differential 915MHz Modulation Input 1 3 .35 3 5 Digital Output Power Output Impedance Output VSWR Second Harmonic Output Other Harmonics Output Sideband Suppression 1, 10, 70 50 Carrier Suppression P 1.5:1 dBc dBc dB 27 20 0 U pg r Analog Power Control Range Analog Power Control Voltage (APC) Analog Power Control Input Current Analog Power Output Digital Power Output, High Digital Power Output, Med Digital Power Output, Low PC 1/PC 2 “ON” PC 1/PC 2 “OFF” mW Ω -25 -30 30 ad ed Output Level Control S ee TRANSCEIVERS 11 Vp ° db kΩ ro du ct RF Output dB 3.6 dB V 1 µA 80 70 10 1 50Ω source, I,Q=500mVp-p 2 Differential, 1Vp single ended R F2 94 Frequency Range Reference Voltage (VREF) Modulation for POUT Power (I & Q) Maximum Modulation (I & Q) Quadrature Phase Error I/Q Amplitude Imbalance Input Impedance mW mW mW mW 1 2 Differential, 1.5Vp single ended Differential VDD =3.3V, LO power=-10dBm, LO frequency=915MHz, SSB, I/Q=1VPP sine wave, 100KHz See Table I for control logic With external matching (see app. schematic) POUT =10mW Modulation DC offset can be externally adjusted for optimum suppression. Carrier suppression is then typically better than 40dB. Input voltage to pin 12 must be less than 3.6V or VCC (whichever is less). VAPC =2.8V, PC1=“0”, PC2=“0” APC=0V, PC 1=“0”, PC 2=“1” APC=0V, PC 1=“1”, PC 2=“0” APC=0V, PC 1=“0”, PC 2=“0” Threshold Voltage Threshold Voltage Standby Mode Turn On/Off Time Power Down “ON” Power Down “OFF” 11-104 0.15 1 2 1 µS V V Threshold voltage; Part is turned “ON” Threshold voltage; Part is turned “OFF” Rev B1 010904 RF2909 Parameter Specification Min. Typ. Max. Unit Condition Power Supply Voltage 3.3 2.7 175 45 60 30 40 mA 130 180 mA 1.5 5 1 mA µA Specifications Operating limits Total, Digital High Power, VAPC, VPC1 =0V, VPC2 =VCC Total, Digital Medium Power, VAPC, VPC2 =0V, VPC1 =VCC Total, Digital Low Power, VAPC, VPC1, VPC2 =0V Total, Linear Power, VAPC =2.8V, VPC1, VPC2 =0V PLL Buffer amp on. Standby mode ro du ct R F2 94 2 Current V V mA 5.0 200 S ee U pg r ad ed TRANSCEIVERS P 11 Rev B1 010904 11-105 RF2909 Pin 1 Function Q SIG Q REF 3 GND 1 4 5 NC LO IN+ Interface Schematic Baseband input to the Q mixer. A DC bias of approximately 1.7V is present at this pin.A DC blocking capacitor is needed if the signal has a different DC level. Maximum output power is obtained when the input signal has a peak-to-peak amplitude of 1V. The input impedance of this pin is 3kΩ. The REF and SIG inputs are interchangeable. If swapping the I SIG and I REF pins, the Q SIG and Q REF also need to be swapped to maintain the correct phase. The SIG and REF pins may be driven deferentially to increase conversion gain. Reference voltage for the Q mixer. This voltage should be the same as the DC voltage supplied to the Q SIG pin. To obtain a carrier suppression of better than 25dB it may be tuned ±0.15V (relative to the Q SIG DC voltage). Without tuning, the carrier suppression will typically be better than 25dB. The input impedance of this pin is about 3 kΩ. Ground connection for the modulator circuits. Keep traces physically short and connect immediately to ground plane for best performance. Balanced LO Input Pin. This pin is internally DC biased and should be DC blocked if connected to a device with a DC level present. For singleended input operation, one pin is used as an input and the other LO input is AC coupled to ground. The balanced input impedance is 100Ω. The single-ended input impedance is 50Ω. Q SIG Q REF BIAS See pin 1. LO IN+ LO IN- VCC2 11 INSTGT 12 APC 13 PC 1 14 PC 2 15 TX PD 16 ro du ct 10 Analog power control input. This pin can be used as a linear power output control with a range of 20 dB. Maximum output power is achieved when APC is high. APC is”wire-or’d” with the digital controls, therefore should be low when using the digital control. The DC input voltage to the pin should always be less than 3.6V. This digital power control input sets the medium current and power output, 10mW. It is “wire-or’d” with APC and PC 2 and can be overcome by either. Therefore, APC and PC 2 must be low to use this setting. P GND2 This pin is used to supply Vcc to the modulator circuits. A RF bypass capacitor should be connected directly to this and ground. Ground connection. This pin is used for RF ground of the power control circuitry and the PA driver amplifier. Keep traces physically short and connect immediately to ground plane for best performance. This pin is used to supply Vcc to the power control and pre amp circuitry. A RF bypass capacitor should be connected directly to this and ground. Interstage bias point between pre amp and power amp. This pin should be pulled up to Vcc with an 8.2nH inductor for 915MHz. ad ed 9 Same as pin 4, except complementary input. U pg r LO INNC VCC1 S ee TRANSCEIVERS 11 6 7 8 R F2 94 2 2 Description PLLON 17 GND3 18 GND4 11-106 This digital power control input set the high current and power output, 100mW. It is “wire-or’d” with APC and PC 1 and can override both of those controls. Therefore, PC 2 must be low to use other settings. BIAS See pin 5. See pin 18. APC PC 1 PC 2 Enables all of the IC except for the LO buffer when > 2V. TX PD Enables the LO buffer amp when > 2V.This can be switched on and off independently of the rest of the IC. This amp draws 1.5mA typically.This can be used to minimize load pulling of the VCO when the transmitter is turned on. Buffer amp is off when < 1V. Ground connection for RF Power Amp. Keep traces physically short and connect immediately to ground plane for best performance. Same as pin16. PLLON Rev B1 010904 RF2909 Pin 19 Function RF OUT Description 20 21 22 23 GND5 GND6 NC I REF Same as pin 17. Interface Schematic Power Amp output, open collector output. RF OUT INSTGT Same as pin 17. Reference voltage for the I mixer. This voltage should be the same as the DC voltage supplied to the I SIG pin. To obtain a carrier suppression of better than 25dB it may be tuned ±0.15V (relative to the I SIG DC voltage). Without tuning, the carrier suppression will typically be better than 25dB. The input impedance of this pin is 3kΩ. I SIG I REF BIAS I SIG Baseband input to the I mixer. A DC bias of approximately 1.7V is present at this pin.A DC blocking capacitor is needed if the signal has a different DC level. Maximum output power is obtained when the input signal has a peak to peak amplitude of 1V. The input impedance of this pin is about 3 kΩ. The REF and SIG inputs are interchangeable. If swapping the I SIG and I REF pins, the Q SIG and Q REF also need to be swapped to maintain the correct phase. The SIG and REF pins may be driven differentially to increase conversion gain. See pin 23. TX PD PLL ON PC 1 Sleep Mode PLL Buffer Linear Po Mode Digital Po Mode Medium Power High Power Low Low High High High High Low High High High High High Low Low Low Low High Low PC 2 Low Low Low Low Low High APC Function 0V 0V 0-Vcc V 0V 0V 0V Entire chip is powered down. Total Icc<1µA. LO Buffer is on. Icc =1.5mA Transmitter in on. Power output is proportional to APC. Transmitter is on. Power out is 1mW. Transmitter is on. Power out is 10mW. Transmitter is on. Power out is 70mW. S ee U pg r ad ed P Operation Mode Rev B1 010904 11-107 11 TRANSCEIVERS Table I ro du ct R F2 94 2 24 RF2909 Evaluation Board Schematic (Download Bill of Materials from www.rfmd.com.) C1 10 nF 50 Ω µstrip J3 LO IN B 50 Ω µstrip +45° -45° 3 4 R1 10 Ω C5 47 pF VCC1 C6 10 nF C7 47 pF L1 2.2 nH Σ VCC3 21 5 20 6 19 7 18 8 17 9 16 10 L3 10 nH PWR CTRL VCC2 C8 10 nF C9 47 pF C10 4.0 pF 12 15 TXCTRL 14 PWRCTRL2 13 PWRCTRL1 P1-3 2909400- C14 10 nF C15 4.7 uF 50 Ω µstrip L2 3.9 nH C12 33 pF P2 1 VCC3 2 GND 3 PC2 P2-1 P2-3 1 PLLCTRL 2 GND 3 APC 1 PC1 2 GND 3 TXCTRL P4 P4-1 P4-3 1 VCC2 2 GND 3 VCC1 ro du ct P3-3 J4 RF OUT C11 3.0 pF P3 P3-1 APC C13 47 pF P1 PLLCTRL P1-1 DC BIAS 11 R2 10 Ω J5 QMOD OUT 22 50 Ω µstrip C4 47 pF J6 IDATAB 23 2 C3 47 pF 50 Ω µstrip 2 J2 LO IN 50 Ω µstrip R F2 94 J1 QDATAB C16 10 nF 24 1 C2 10 nF S ee U pg r ad ed TRANSCEIVERS P 11 11-108 Rev B1 010904 RF2909 ro du ct R F2 94 2 Evaluation Board Layout Board Size 1.7440" x 1.7480" S ee U pg r ad ed TRANSCEIVERS P 11 Rev B1 010904 11-109 S ee U pg r ad ed P TRANSCEIVERS 11 ro du ct R F2 94 2 RF2909 11-110 Rev B1 010904