RF3857 DUAL CHANNEL LNA WITH BYPASS MODE N/C VREF2 13 GAIN SEL1 1 Low Noise and High Intercept Point Adjustable Bias Current Power Down Control Low Insertion Loss Bypass Feature 1.8V to 4V Operation (See “Bias Note” on Page 3) 0.9GHz to 4.0GHz Operation 12 GAIN SELECT2 Logic Control GND 2 Logic Control 11 GND 10 RFOUT2 RFOUT1 3 9 N/C N/C 4 5 6 7 8 RFIN2 14 GND 15 GND 16 RFIN1 N/C Features VREF1 Package Style: QFN, 16-Pin, 3mmx3mmx0.45mm Applications WiFi LNA with Bypass Feature WiMAX LNA with Bypass Feature CDMA PCS LNA with Bypass Feature Suitable for 1x2 or 2x1 MIMO Applications Commercial and Consumer Systems Functional Block Diagram Product Description The RF3857 is a dual channel switchable low noise amplifier with a very high dynamic range designed for digital cellular, WiMAX, and WiFi applications. The device functions as an outstanding front end low noise amplifier. The bias current may be set externally. The RF3857 combines two receive paths, which is ideal in an application that requires two receive paths, such as 1x2 and 2x2 MIMO for both WiFi and WiMax aplications. The IC is featured in a standard QFN, 16-pin, 3mmx3mm plastic package. GaAs HBT GaAs MESFET InGaP HBT Optimum Technology Matching® Applied SiGe BiCMOS Si BiCMOS SiGe HBT GaAs pHEMT Si CMOS Si BJT GaN HEMT RF MEMS LDMOS RF MICRO DEVICES®, RFMD®, Optimum Technology Matching®, Enabling Wireless Connectivity™, PowerStar®, POLARIS™ TOTAL RADIO™ and UltimateBlue™ 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. ©2006, RF Micro Devices, Inc. DS110616 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 1 of 11 RF3857 Absolute Maximum Ratings Parameter Rating Unit Supply Voltage -0.5 to +6.0 VDC Input RF Level +5 (see note) dBm 32 mA Operating Ambient Temperature -40 to +85 °C Storage Temperature -40 to +150 °C Current Drain, ICC per Channel NOTE: Exceeding any one or a combination of the above maximum rating limits may cause permanent damage. Input RF transients to +15dBm will not harm the device. For sustained operation at inputs >+5dBm, a small dropping resistor is recommended in series with the VCC in order to limit the current due to self-biasing to <32mA per channel. Parameter Min. Specification Typ. Max. 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. Unit Temp=25°C, VCC=3.3V, VREF=3.3V, Frequency=2450MHz for WiBro/WiFi Tune and 3500MHz for WiMax Tune, Gain Select=Low or High depending on the test unless otherwise noted in the condition column) Typical Operating Conditions Frequency Range Condition 900 4000 MHz 2900 MHz WiBRO/WiFi Low Noise Amplifier Frequency 2300 2450 HIGH GAIN MODE Gain Gain Select<0.8V, VREF =3.3V, T=+25°C 12.0 14.0 17.0 1.55 Noise Figure 1.0 1.3 Input IP3 +7.0 +9.0 Output VSWR 1.7:1 dB dB dBm RFIN1 to RFOUT1 or RFIN2 to RFOUT2 receieve paths over full temp range, frequency, and process. Over full temp range, frequency, and process. IIP3 will improve if ICC is raised above 7mA. 2:1 Total Current Drain (per channel) 8.5 mA Total current includes ICC +IREF Channel Isolation -40 dBc Difference between the POUT at RFOUT1 and RFOUT2 when signal is applied at RFIN1 or RFIN2 Gain Select>1.8V, VREF =0V, VCC =3.3V BYPASS MODE Gain Input IP3 -3.0 -2.5 -2.0 dB Both RX paths, over full temp range and process. Note: Bypass mode insertion loss will degrade gradually as VCC goes below 2.7V. +19.5 +21.0 +23.0 dBm For each RX path, over full tmep range, and process. 3.0 mA Output VSWR 1.6:1 Total Current Drain 2.0 Total current includes ICC +IREF WiMAX Low Noise Amplifier HIGH GAIN MODE Frequency Gain 2 of 11 Gain Select<0.8V, VREF =3.3V, VCC =3.3V 3100 3500 10 12 MHz 14.5 dB RFIN1 to RFOUT1 or RFIN2 to RFOUT2 receive paths over full temp range, frequency, and process. 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110616 RF3857 Parameter Min. Specification Typ. Max. 1.2 1.7 2.0 Unit Condition dB Over full temp range, frequency range, and process. WiMAX Low Noise Amplifier, cont. Noise Figure IIP3 9 Total Current Drain (per channel) 8.5 dBm 10 mA BYPASS MODE Total current drain includes ICC +IREF. VCC=3.3V, VREF=3.3V, Gain select<1.8V. Gain Select>1.8V, VREF =0V Gain -3 dB Input IP3 20 dBm 2 mA Total Current Drain (per channel) Note: Bypass mode insertion loss will degrade gradually as VCC goes below 2.7V. Total current drain includes ICC +IREF Power Supply Voltage (VCC) 1.8 3.0 VSELECT Low VSELECT High Power Down per RX Path 5.0 V See bias note 0.8 V High Gain mode. Gain Select<0.8V, VREF =3.3V V Low Gain mode. Gain Select>1.8V, VREF =0V 10 A Gain Select<0.8V, VREF =0V, VCC =3.3V (Over full temp range, frequency, and beta) 1.8 0 VREF1 or VREF 2 Turn On/Off 100 <150 nSec For faster turn on and off time C1 and C2 should be changed from 22nF to a value between 10pF to 100pF Gain Select 1 or 2 Turn On/Off 100 <150 nSec For faster turn on and off time C1 and C2 should be changed from 22nF to a value between 3.0pF to 100pF Bias note: Due to the presence of ESD protection circuitry on the RF3857, the maximum allowable collector bias voltage (pin 4) is 4.0V. Higher supply voltages such as 5V are permissible if a series resistor is used to drop VCC to <4.0V for a given ICC. DS110616 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 3 of 11 RF3857 Pin 1 Function GAIN SEL1 2 GND 3 RFOUT1 4 5 N/C RFIN1 Description Interface Schematic This pin selects high gain and bypass modes for Amplifier 1. Gain Sel1<0.8V, Amp1 high gain. Gain Sel1>1.8V, Amp1 bypass. Amplifier 1 ground connection. For best performance, keep traces physically short and connect immediately to ground plane. Amplifier 1 output pin. This pin is an open-collector output. It must be biased to VCC through a choke or matching inductor. This pin is matched to 50 with the network shown in the evaluation board schematic. No internal connection. RF input pin for amplifier 1. This part is designed such that 50 is the optimal source impedance for best noise figure. Best noise figure is achieved with only a series capacitor on the input. To Bias Circuit RF OUT RF IN 6 7 8 9 10 11 12 13 GND GND RFIN2 N/C RFOUT2 GND GAIN SEL2 VREF2 14 15 16 N/C N/C VREF1 4 of 11 Isolation ground connection. Can be grounded or not connected. See pin 7. RF input pin for amplifier 2. See pin 5. No internal connection. Amplifier 2 output pin. See pin 3. Amplifier 2 ground connection. See pin 2. Selects high gain and bypass modes for Amplifier 2. See pin 1. Bias control for amplifier 2. An external resistor can be used to set the bias current for any VREF voltage. V B IA S No internal connection. No internal connection. Bias control for amplifier 1. See pin 13. 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110616 RF3857 Package Drawing DS110616 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 5 of 11 RF3857 Evaluation Board Schematic WiBRO/WiFi (2.3GHz to 2.7GHz) C7 10 nF VCC1 C8 100 pF L1 1.5 nH C10 1.5 pF R1 0 C9 DNI J1 RFIN1 J2 RFIN2 50 strip 50 strip R2 0 C1 22 nF 4 3 2 16 6 Logic Control 15 7 Logic Control 14 8 13 9 10 11 GAIN SEL1 12 R3 1.8 k R4 1.8 k C5 DNI L2 1.5 nH R6 0 VREF1 VREF2 GAIN SEL2 R5 0 C6 1.5 pF J3 RFOUT1 1 5 C2 22 nF 50 strip 50 strip J4 RFOUT2 C3 100 pF VCC2 C4 10 nF Note: for best turn on and OFF time for both RX paths C1 and C2 should be changed to a value between 10pF to 100pF. 6 of 11 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110616 RF3857 Evaluation Board Schematic WiMAX (3.1GHz to 3.8GHz) C7 10 nF VCC1 C8 100 pF L1 1.8 nH C10 2.0 pF R1 0 C9 DNI J1 RFIN1 J2 RFIN2 50 strip 50 strip R2 0 C1 3.0 pF 4 3 2 16 6 Logic Control 15 7 Logic Control 14 8 13 9 10 11 GAIN SEL1 12 R3 1.8 k R4 1.8 k C5 DNI L2 1.8 nH R6 0 VREF1 VREF2 GAIN SEL2 R5 0 C6 2.0 pF J3 RFOUT1 1 5 C2 3.0 pF 50 strip 50 strip J4 RFOUT2 C3 100 pF VCC2 C4 10 nF DS110616 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 7 of 11 RF3857 WiBRO/WiFi DATA 24.0 GAIN DW:L)L Band in High Gain Mode VCC=3.3V and VREF=3.3V Over Temp 0.0 Gain DW:L)L Band in Bypass Mode VCC=3.3V and VREF=3.3V Over Temp 22.0 -1.0 20.0 -2.0 Gain (dB) Gain (dB) 18.0 16.0 14.0 12.0 -4.0 10.0 Gain @ -40°C Gain @ 25°C Gain @ 85°C 8.0 Gain @ -40°C Gain @ 25°C Gain @ 85°C -5.0 6.0 -6.0 2200.0 2300.0 2400.0 2500.0 2600.0 2700.0 2800.0 2900.0 2200.0 2300.0 2400.0 2500.0 2600.0 2700.0 2800.0 2900.0 Frequency (MHz) Frequency (MHz) 4.0 Noise Figure DW:L)L Band in High Gain Mode VCC=3.3V and VREF=3.3V Over Temp 16.0 3.5 14.0 3.0 12.0 2.5 10.0 IIP3 (dBm) Noise Figure (dB) -3.0 2.0 1.5 1.0 IIP3 DW:L)L Band in High Gain Mode VCC=3.3V and VREF=3.3V Over Temp 8.0 6.0 4.0 NF @ -40°C NF @ 25°C NF @ 85°C 0.5 IIP3 @ -40°C IIP3 @ 25°C IIP3 @ 85°C 2.0 0.0 0.0 2200.0 2300.0 2400.0 2500.0 2600.0 2700.0 2800.0 2900.0 2200.0 2300.0 2400.0 2500.0 2600.0 2700.0 2800.0 2900.0 Frequency (MHz) Frequency (MHz) 30.0 IIP3 DW:L)L Band in Bypass Mode VCC=3.3V and VREF=3.3V Over Temp ICC + IREF DW:L)L Band in High Gain Mode 12.0 28.0 VCC=3.3V and VREF=3.3V Over Temp 11.0 26.0 10.0 ICC + IREF (mA) IIP3 (dBm) 24.0 22.0 20.0 18.0 9.0 8.0 7.0 16.0 IIP3 @ -40°C IIP3 @ 25°C IIP3 @ 85°C 14.0 12.0 8 of 11 ICC + IREF @ -40°C ICC + IREF @ 25°C ICC + IREF @ 85°C 6.0 5.0 2200.0 2300.0 2400.0 2500.0 2600.0 2700.0 2800.0 2900.0 2200.0 2300.0 2400.0 2500.0 2600.0 2700.0 2800.0 2900.0 Frequency (MHz) Frequency (MHz) 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110616 RF3857 WiMAX DATA 20.0 GAIN @ WiMAX Band in High Gain Mode VCC=3.3V and VREF=3.3V Over Temp 0.0 18.0 -1.0 -2.0 Gain (dB) Gain (dB) 16.0 14.0 12.0 -3.0 -4.0 10.0 Gain @ -40°C Gain @ 25°C Gain @ 85°C 8.0 Gain @ -40°C Gain @ 25°C Gain @ 85°C -5.0 6.0 -6.0 3100.0 3200.0 3300.0 3400.0 3500.0 3600.0 3700.0 3800.0 3100.0 3200.0 3300.0 3400.0 3500.0 3600.0 3700.0 3800.0 Frequency (MHz) Frequency (MHz) 4.0 Noise Figure @ WiMAX Band in High Gain Mode VCC=3.3V and VREF=3.3V Over Temp 20.0 IIP3 @ WiMAX Band in High Gain Mode VCC=3.3V and VREF=3.3V Over Temp 18.0 3.5 16.0 3.0 14.0 2.5 IIP3 (dBm) Noise Figure (dB) Gain @ WiMAX Band in Bypass Mode VCC=3.3V and VREF=3.3V Over Temp 2.0 1.5 12.0 10.0 8.0 6.0 1.0 4.0 NF @ -40°C NF @ 25°C NF @ 85°C 0.5 IIP3 @ -40°C IIP3 @ 25°C IIP3 @ 85°C 2.0 0.0 0.0 3100.0 3200.0 3300.0 3400.0 3500.0 3600.0 3700.0 3800.0 3100.0 3200.0 3300.0 3400.0 3500.0 3600.0 3700.0 3800.0 Frequency (MHz) Frequency (MHz) IIP3 @ WiMAX Band in Bypass Mode VCC=3.3V and VREF=3.3V Over Temp ICC + IREF @ WiMAX Band in High Gain Mode 30.0 12.0 28.0 VCC=3.3V and VREF=3.3V Over Temp 11.0 26.0 10.0 ICC + IREF (mA) IIP3 (dBm) 24.0 22.0 20.0 18.0 9.0 8.0 7.0 16.0 IIP3 @ -40°C IIP3 @ 25°C IIP3 @ 85°C 14.0 12.0 ICC + IREF @ -40°C ICC + IREF @ 25°C ICC + IREF @ 85°C 6.0 5.0 3100.0 3200.0 3300.0 3400.0 3500.0 3600.0 3700.0 3800.0 3100.0 3200.0 3300.0 3400.0 3500.0 3600.0 3700.0 3800.0 Frequency (MHz) Frequency (MHz) DS110616 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 9 of 11 RF3857 Evaluation Board Layout Board Size 1.0” x 1.5” Board Thickness 0.032”, Board Material FR-4 10 of 11 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. DS110616 RF3857 Ordering Information DS110616 Ordering Code Description RF3857 Standard 25 piece bag RF3857SR Standard 100 piece reel RF3857TR7 Standard 2500 piece reel RF3857PCK-410 Fully assembled evaluation board tuned for 2.0GHz to 3.0GHz and 5 loose sample pieces RF3857PCK-411 Fully assembled evaluation board tuned for 3.1GHz to 4.0GHz and 5 loose sample pieces 7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical support, contact RFMD at (+1) 336-678-5570 or [email protected]. 11 of 11