RF212-21

RF212 Image-Reject Front End for Dual or Tri-Band GSM Applications The RF212 device is available as a dual-band (EGSM900/DCS1800) front end or as a tri-band (EGSM900/DCS1800/PCS1900) front end for Global System for Mobile Communications (GSM) mobile telephony applications. Each device integrates all the required front-end components after the frequency pre-select filters. These components include the Low Noise Amplifiers (LNAs), the internal image-reject filters, mixers, and a Local Oscillator (LO) amplifier. The main advantage of the RF212 is its ability to provide a minimum of 35 dB of image rejection for each band. The block diagrams of the devices are shown in Figures 1 and 2. The device packages and pin configurations are shown in Figures 3 and 4. Features • • • • • • • • • • • • Supports EGSM LNA and mixer for RF to IF conversion 12 dB or 20 dB switchable gain step Minimum 35 dB of image rejection No external post-LNA filters required Common Intermediate Frequency (IF) port for all bands IF range from 350 MHz to 450 MHz High isolation LO input buffer Differential IF output High dynamic range with low current consumption Three-cell battery operation (2.7 to 3.6 V) 20-pin Exposed paddle, Thin Shrink Small Outline Package (ETSSOP) Applications • Dual/tri-band digital cellular mobile telephony (EGSM900/DCS1800, or EGSM900/DCS1800/PCS1900) LOIN LOIN LNA900IN IFout LNA900IN IFout LNA1800IN LNA1800IN LNA1900IN Band Select 1 control Band Select 1 Band Select 2 control Step Sel Gain Sel C0002 Step Sel Gain Sel C0001 Figure 1. RF212 Dual-Band Device Block Diagram Figure 2. RF212 Tri-Band Device Block Diagram Data Sheet Conexant Proprietary Information and Specifications are Subject to Change Doc. No. 100780D May 24, 2000 RF212 Image-Reject Front End NC GND GND LNA900IN VCC VCC GAINSEL LNA1800IN GND ENA 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC GND STEPSEL IFOUT+ IFOUTGND BANDSEL1 LOIN LOGND NC C067 NC GND GND LNA900IN VCC VCC GAINSEL LNA1800IN LNA1900IN ENA 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC GND STEPSEL IFOUT+ IFOUTBANDSEL2 BANDSEL1 LOIN LOGND NC C122 Figure 3. RF212 Dual-Band Device Pin Configuration − 20-Pin ETSSOP Figure 4. RF212 Tri-Band Device Pin Configuration – 20-Pin ETSSOP Technical Description Both RF212 devices form front ends of a dual-band or a tri-band super-heterodyne receiver. The RF212 dual-band device is optimized for an EGSM900/DCS1800 design, while the RF212 tri-band device is suitable for EGSM900, DCS1800, and PCS 1900. Each frequency band has its own separate front-end receiver path. Each receiver path contains an LNA, an imagereject filter, and a mixer. The IF and LO ports are common to all frequency bands. The image rejection achievable by this frontend design without any additional external components is 35 dB minimum for an IF of 400 MHz. Both devices operate over a supply voltage range of 2.7 V to 3.6 V. The RF212 dual-band device has one band selection pin (BANDSEL1 on pin 14). When BANDSEL1 is set to logic “0,” the EGSM900 receiver path is active. The LO frequency needs to be higher than the RF input frequency (i.e., a high side injection is used). When BANDSEL1 is set to logic “1,” the DCS1800 receiver path is active. The LO frequency needs to be less than the RF input frequency (i.e., a low-side injection is used). With a 400 MHz IF, this arrangement allows a single, wide-range Voltage Controlled Oscillator (VCO) to be used for each band of operation. Similarly, the RF212 tri-band device has two band selection pins (BANDSEL1 and BANDSEL2, pins 14 and 15, respectively). The EGSM900 path uses the high side injection for the LO, while DCS1800 and PCS1900 paths use the low side injection. Tables 1 and 2 provide the frequency band selection settings for the dual and tri-band devices, respectively. All the LNAs have switchable gain. The gain mode is selectable using the GAINSEL signal (pin 7). Low gain mode is selected by driving the GAINSEL signal to a logic “1”; high gain mode is selected by driving the signal to a logic “0.” Depending on the need of the handset design on the gain distribution, the gain step between the high gain and low gain modes can be set to either a 12 dB step or a 20 dB step. This gain step is selectable with the STEPSEL signal (pin 18). Electrical and Mechanical Specifications ________________ The RF212 signal pin assignments and functional pin descriptions are found in Table 3 (dual-band) and Table 4 (triband). The absolute maximum ratings of the RF212 are provided in Table 5, the operating conditions are specified in Table 6, and electrical specifications are provided in Table 7. Figure 3 shows the diagram for a typical application circuit using the RF212 front end. Figure 4 provides the package dimensions for both of the 20-pin ETSSOP devices. ESD Sensitivity The RF212 is a static-sensitive electronic device. Do not operate or store near strong electrostatic fields. Take proper ESD precautions. 2 May 24, 2000 Conexant Proprietary Information and Specifications are Subject to Change 100780D Image-Reject Front End RF212 Table 1. RF212 Dual-Band Selection BANDSEL1, pin 14 0 1 Mode EGSM900 DCS1800 Table 2. RF212 Tri-Band Selection BANDSEL1, pin 14 0 0 1 1 BANDSEL2, pin 15 0 1 0 1 Mode EGSM900 DCS1800 PCS1900 Table 3. RF212 Dual-Band Device Signal Description Pin # 1 2 3 4 5 6 7 8 NC GND GND LNA900IN VCC VCC GAINSEL LNA1800IN Name Description No connect (recommend connecting to ground) Ground Ground 900 MHz LNA input Supply Supply LNA gain select 1800 MHz LNA input Pin # 11 12 13 14 15 16 17 18 NC Name Description No connect (recommend connecting to ground) LO input ground LO input Band select control Ground Mixer negative output Mixer positive output Gain step select. STEPSEL= 0 selects a 12 dB gain step; STEPSEL = 1 selects a 20 dB gain step Ground Supply LOGND LOIN BANDSEL1 GND IFOUT− IFOUT+ STEPSEL 9 10 GND ENA Ground Device enable, active high 19 20 GND VCC Table 4. RF212 Tri-Band Device Signal Description Pin # 1 2 3 4 5 6 7 8 NC GND GND LNA900IN VCC VCC GAINSEL LNA1800IN Name Description No connect (recommend connecting to ground) Ground Ground 900 MHz LNA input Supply Supply LNA gain select 1800 MHz LNA input Pin # 11 12 13 14 15 16 17 18 NC Name Description No connect (recommend connecting to ground) LO input ground LO input Band select control 1 Band select control 2 Mixer negative output Mixer positive output Gain step select. STEPSEL= 0 selects a 12 dB gain step; STEPSEL = 1 selects a 20 dB gain step Ground Supply LOGND LOIN BANDSEL1 BANDSEL2 IFOUT− IFOUT+ STEPSEL 9 10 LNA1900IN ENA 1900 MHz LNA input Device enable, active high 19 20 GND VCC 100956A May 18, 2000 Conexant – Preliminary Proprietary Information and Specifications are Subject to Change 3 RF212 Image-Reject Front End Table 5. Absolute Maximum Ratings Parameter Storage Temperature Supply Voltage (VCC) Input Voltage Range Minimum −40 −0.3 −0.3 Maximum +125 +3.6 Vcc Units °C V V Table 6. RF212 Recommended Operating Conditions Parameter Supply Voltage Operating Temperature Min 2.7 −30 Typical 3.0 +25 Max 3.6 +85 Units V °C (TA = 25 °C, Vcc = 2.7 V, fIF = 400 MHz, Plo = −10 dBm) Table 7. RF212 Electrical Specifications (1 of 3) Symbol Test Condition EGSM900 Mode Parameter Supply current:: Enable mode Sleep mode RF Input frequency IF frequency LO to RF input isolation Input impedance Power gain (for 2 kΩ differential output impedance): High gain mode Low gain mode 1 Low gain mode 2 Gain step 1 Gain step 2 Temperature coefficient Gain variation versus frequency Noise figure: High gain Low gain mode 1 Low gain mode 2 Noise figure degradation with blocker: High gain Input 1 dB compression point Input third order intercept point Differential IF shunt output resistance Image rejection: fIF = 400 MHz fIF = 350 or 450 MHz Min Typical Max Units ENA = 1 ENA = 0 925 fIF 350 30 15 30 960 400 50 450 mA µA MHz MHz dB Ω GMAX1 GMIN1 GMIN2 GSTEP1 GSTEP2 FTC1 GAINSEL = 0 GAINSEL = 1, STEPSEL = 1 GAINSEL = 1, STEPSEL = 0 20 –24 –14 22 0 10 –22 –12 –0.02 25 –20 –10 0.8 dB dB dB dB dB dB/°C dB dB dB dB dB dBm dBm dBm kΩ dB dB GAINSEL = 0 GAINSEL = 1, STEPSEL = 1 GAINSEL = 1, STEPSEL = 0 −22 dBm blocker, GAINSEL = 0 (Note 1) IP1DB IP3 high gain mode low gain mode −22 −18 2.3 18 10 1.6 –20 –13 −12 2 35 25 50 3.5 4 May 24, 2000 Conexant Proprietary Information and Specifications are Subject to Change 100780D Image-Reject Front End RF212 (TA = 25 °C, Vcc = 2.7 V, fIF = 400 MHz, Plo = −10 dBm) Table 7. RF212 Electrical Specifications (2 of 3) Symbol Test Condition DCS1800 Mode Parameter Supply current: Enable mode Sleep mode RF input frequency IF frequency LO to RF input isolation Input impedance Power gain (for 2 kΩ differential output impedance): High gain mode Low gain mode 1 Low gain mode 2 Gain step 1 Gain step 2 Temperature coefficient Gain variation versus frequency Noise figure: High gain Low gain mode 1 Low gain mode 2 Noise figure degradation with blocker: High gain Input 1 dB compression point Input third order intercept point Differential IF shunt output resistance Image rejection: fIF = 400 MHz fIF = 350 or 450 MHz Min Typical Max Units ENA = 1 ENA = 0 1805 350 30 19 30 1880 400 50 450 mA µA MHz MHz dB Ω GMAX1 GMIN1 GMIN2 GSTEP1 GSTEP2 FTC1 GAINSEL = 0 GAINSEL = 1, STEPSEL = 1 GAINSEL = 1, STEPSEL = 0 20 –22 –14 22 2 10 –20 –12 –0.02 25 –18 –10 1.2 dB dB dB dB dB dB/°C dB dB dB dB dB dBm dBm dBm kΩ dB dB GAINSEL = 0 GAINSEL = 1, STEPSEL = 1 GAINSEL = 1, STEPSEL = 0 −22 dBm blocker, GAINSEL = 0 (Note 2) IP1DB IP3 high gain mode low gain mode −23 −20 3.5 16.5 11 1.6 –20 –16 −12 2 35 25 40 4.5 PCS1900 Mode (for tri-band device only) Supply current: Enable mode Sleep mode RF input frequency IF frequency LO to RF input isolation Input impedance Power gain (for 2 kΩ differential output impedance): High gain mode Low gain mode 1 Low gain mode 2 Gain step 1 Gain step 2 Temperature coefficient Gain variation versus frequency Noise figure: High gain Low gain mode 1 Low gain mode 2 Noise figure degradation with blocker: High gain GMAX1 GMIN1 GMIN2 GSTEP1 GSTEP2 FTC1 GAINSEL = 0 GAINSEL = 1, STEPSEL = 1 GAINSEL = 1, STEPSEL = 0 20 –22 –14 ENA = 1 ENA = 0 1930 350 30 50 22 2 10 –20 –12 –0.02 25 –18 –10 1.2 GAINSEL = 0 GAINSEL = 1, STEPSEL = 1 GAINSEL = 1, STEPSEL = 0 −22 dBm blocker, GAINSEL = 0 (Note 3) 3.5 16.5 11 1.6 4.5 400 19 30 1990 450 mA µA MHz MHz dB Ω dB dB dB dB dB dB/°C dB dB dB dB dB 100956A May 18, 2000 Conexant – Preliminary Proprietary Information and Specifications are Subject to Change 5 RF212 Image-Reject Front End (TA = 25 °C, Vcc = 2.7 V, fIF = 400 MHz, Plo = −10 dBm) Table 7. RF212 Electrical Specifications (3 of 3) Symbol Test Condition high gain mode low gain mode Parameter Input 1 dB compression point Input third order intercept point Differential IF shunt output resistance Image rejection: fIF = 400 MHz fIF = 350 or 450 MHz Min −23 −20 Typical –20 –16 −12 2 Max Units dBm dBm dBm kΩ dB dB PCS1900 Mode (for tri-band device only) (continued) 35 25 Local Oscillator (LO) 1275 fIF = 400 MHz PLO Control Signals (All Modes) VIH VIL tON −15 Vcc – 0.4 40 LO frequency LO input return loss (with external matching circuit) LO input power Digital input voltages (ENA, GAINSEL, BANDSEL1, BANDSEL2, and STEPSEL) Enable time Bandselect switching time Note 1: Assumes −5 dBm @ 915 MHz blocker at the antenna input attenuated by 17 dB. Note 2: Assumes −12 dBm @ 1785 MHz blocker at the antenna input attenuated by 10 dB. Note 3: Assumes −12 dBm @ 1910 MHz blocker at the antenna input attenuated by 10 dB. 1640 −10 −10 −5 MHz dB dBm V 0.4 10 15 V µs µs Vcc 10 10 22 pF 2000 GAINSEL 10 pF 2.2 F 7 22 pF EGSM Rx filter LNA900IN 47pF 12 nH 12 pF DCS Rx Filter LNA1800IN 1.5 pF 3.0 nH 5 6 20 L1 82 nH L2 82 nH 4 IFOUT+ 100 pF to IF SAW match 100 pF 2 K || (L1+L2) differential 17 16 IFOUT- 8 PCS Rx Filter LNA1900IN 1.2 pF 3.0 nH BANDSEL1 2000 9 14 22 pF Control ENABLE BANDSEL2 2000 15 STEPSEL 2000 27 pF 22 pF 2000 10 22 pF Bias 18 LOIN 13 2 3 12 19 4.7 nH C903 Figure 3. Typical RF212 Application Circuit (for dual-band device, ground pins 9 and 15) 6 May 24, 2000 Conexant Proprietary Information and Specifications are Subject to Change 100780D Image-Reject Front End RF212 0.65 mm 3 2 1 Pin 1 indicator 4.20 mm 3 2 1 6.40 mm base metal TOP VIEW BOTTOM VIEW 6.50±0.10 mm 1.00+0.5/-0.2 mm 1.20 mm max 1.00 mm Ref 4.40±0.10 mm 0.24+0.06/-0.05 mm 0.10±0.05 mm END VIEW SIDE VIEW Figure 4. RF212 Package Dimensions − 20-Pin ETSSOP 100956A May 18, 2000 Conexant – Preliminary Proprietary Information and Specifications are Subject to Change 3.0 mm C003 7 RF212 Image-Reject Front End Ordering Information Model Name Dual-Band Image-Reject Front End Tri-Band Image-Reject Front End Manufacturing Part Number RF212-11 RF212-21 © 2000, Conexant Systems, Inc. All Rights Reserved. Information in this document is provided in connection with Conexant Systems, Inc. ("Conexant") products. These materials are provided by Conexant as a service to its customers and may be used for informational purposes only. Conexant assumes no responsibility for errors or omissions in these materials. Conexant may make changes to specifications and product descriptions at any time, without notice. Conexant makes no commitment to update the information and shall have no responsibility whatsoever for conflicts or incompatibilities arising from future changes to its specifications and product descriptions. 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