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| 19-3906; Rev 0; 1/06 KIT ATION EVALU ILABLE AVA SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch General Description The MAX9986A high-linearity downconversion mixer provides 8.2dB gain, +25dBm IIP3, and 10dB NF for 815MHz to 1000MHz base-station receiver applications. With a 960MHz to 1180MHz LO frequency range, this particular mixer is ideal for high-side LO injection receiver architectures. Low-side LO injection is supported by the MAX9984, which is pin-for-pin and functionally compatible with the MAX9986A. In addition to offering excellent linearity and noise performance, the MAX9986A also yields a high level of component integration. This device includes a double-balanced passive mixer core, an IF amplifier, a dual-input LO selectable switch, and an LO buffer. On-chip baluns are also integrated to allow for single-ended RF and LO inputs. The MAX9986A requires a nominal LO drive of 0dBm, and supply current is guaranteed to be below 250mA. The MAX9986A is a derivative version of the MAX9986 with improved large-signal blocking performance. The MAX9984/MAX9986/MAX9986A are pin compatible with the MAX9994/MAX9996 1700MHz to 3000MHz mixers, making this entire family of downconverters ideal for applications where a common PC board layout is used for both frequency bands. The MAX9986A is also functionally compatible with the MAX9993. The MAX9986A is available in a compact, 20-pin, thin QFN package (5mm x 5mm) with an exposed paddle. Electrical performance is guaranteed over the extended -40C to +85C temperature range. Features o 815MHz to 1000MHz RF Frequency Range o 960MHz to 1180MHz LO Frequency Range (MAX9986A/MAX9986) o 570MHz to 850MHz LO Frequency Range (MAX9984) o 50MHz to 250MHz IF Frequency Range o 8.2dB Conversion Gain o +25dBm Input IP3 o +14.8dBm Input 1dB Compression Point o 10dB Noise Figure o 69dBc 2LO - 2RF Spurious Rejection at PRF = -10dBm o Integrated LO Buffer o Integrated RF and LO Baluns for Single-Ended Inputs o Low -3dBm to +3dBm LO Drive o Built-In SPDT LO Switch with 49dB LO1 to LO2 Isolation and 50ns Switching Time o Pin Compatible with MAX9994/MAX9996 1700MHz to 3000MHz Mixers o Functionally Compatible with MAX9993 o External Current-Setting Resistors Provide Option for Operating Mixer in Reduced Power/Reduced Performance Mode o Lead-Free Package Available MAX9986A Applications 850MHz WCDMA Base Stations GSM 850/GSM 900 2G and 2.5G EDGE Base Stations cdmaOneTM and cdma2000(R) Base Stations iDEN(R) Base Stations Predistortion Receivers Fixed Broadband Wireless Access Wireless Local Loops Private Mobile Radios Military Systems Microwave Links Digital and Spread-Spectrum Communication Systems cdma2000 is a registered trademark of the Telecommunications Industry Association. cdmaOne is a trademark of CDMA Development Group. iDEN is a registered trademark of Motorola, Inc. PART MAX9986AETP Ordering Information TEMP RANGE PIN-PACKAGE -40C to +85C PKG CODE 20 Thin QFN-EP* T2055-3 5mm x 5mm 20 Thin QFN-EP* T2055-3 5mm x 5mm 20 Thin QFN-EP* T2055-3 5mm x 5mm 20 Thin QFN-EP* T2055-3 5mm x 5mm MAX9986AETP-T -40C to +85C MAX9986AETP+ -40C to +85C MAX9986AETP+T -40C to +85C *EP = Exposed paddle. + = Lead free. T = Tape-and-reel. Pin Configuration/Functional Diagram and Typical Application Circuit appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +5.5V IF+, IF-, LOBIAS, LOSEL, IFBIAS to GND...-0.3V to (VCC + 0.3V) TAP ........................................................................-0.3V to +1.4V LO1, LO2, LEXT to GND........................................-0.3V to +0.3V RF, LO1, LO2 Input Power .............................................+12dBm RF (RF is DC shorted to GND through a balun) .................50mA Continuous Power Dissipation (TA = +70C) 20-Pin Thin QFN-EP (derate 26.3mW/C above +70C)...........2.1W Note A: TC is the temperature on the exposed paddle of the package. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. JA .................................................................................+38C/W JC .................................................................................+13C/W Operating Temperature Range (Note A) ....TC = -40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C DC ELECTRICAL CHARACTERISTICS (MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, no RF signal applied, IF+ and IF- outputs pulled up to VCC through inductive chokes, R1 = 953, R2 = 619, TC = -40C to +85C, unless otherwise noted. Typical values are at VCC = +5V, TC = +25C, unless otherwise noted.) PARAMETER Supply Voltage Supply Current LO_SEL Input-Logic Low LO_SEL Input-Logic High SYMBOL VCC ICC VIL VIH 2 CONDITIONS MIN 4.75 TYP 5.00 213 MAX 5.25 250 0.8 UNITS V mA V V AC ELECTRICAL CHARACTERISTICS (MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50 sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 815MHz to 1000MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40C to +85C, unless otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF = 160MHz, TC = +25C, unless otherwise noted.) (Note 1) PARAMETER RF Frequency Range LO Frequency Range IF Frequency Range Conversion Gain Gain Variation Over Temperature SYMBOL fRF fLO fIF GC (Note 2) (Note 2) MAX9984 (Note 2) TC = +25C TC = -40C to +85C Flatness over any one of three frequency bands: fRF = 824MHz to 849MHz fRF = 869MHz to 894MHz fRF = 880MHz to 915MHz P1dB (Note 3) Two tones: fRF1 = 910MHz, fRF2 = 911MHz, PRF = -5dBm/tone, fLO = 1070MHz, PLO = 0dBm, TA = +25C TC = +25C to -40C TC = +25C to +85C CONDITIONS MIN 815 960 570 50 7.2 8.2 -0.009 TYP MAX 1000 1180 850 250 9.3 UNITS MHz MHz MHz dB dB/C Conversion Gain Flatness 0.15 dB Input Compression Point 14.8 dBm Input Third-Order Intercept Point IIP3 22 25 dBm Input IP3 Variation Over Temperature -1.8 +0.7 dB 2 _______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch AC ELECTRICAL CHARACTERISTICS (continued) (MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50 sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 815MHz to 1000MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40C to +85C, unless otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF = 160MHz, TC = +25C, unless otherwise noted.) (Note 1) PARAMETER Noise Figure SYMBOL NF CONDITIONS Single sideband, fIF = 190MHz fRF = 900MHz (no signal) fLO = 1090MHz fBLOCKER = 981MHz fIF = 190MHz (Note 4) PBLOCKER = +8dBm PBLOCKER = +11dBm MIN TYP 10 20 dB 23 MAX UNITS dB MAX9986A Noise Figure Under-Blocking Small-Signal Compression Under-Blocking Condition LO Drive 2x2 Spurious Response at IF 3x3 LO1-to-LO2 Isolation LO Leakage at RF Port LO Leakage at IF Port RF-to-IF Isolation LO Switching Time RF Port Return Loss PBLOCKER = PFUNDAMENTAL = -5dBm +8dBm fFUNDAMENTAL = 910MHz PBLOCKER = fBLOCKER = 911MHz +11dBm -3 2LO - 2RF 3LO - 3RF PLO = +3dBm TC = +25C (Note 5) PLO = +3dBm PLO = +3dBm 50% of LOSEL to IF settled to within 2 LO1/2 port selected, LO2/1 and IF terminated PRF = -10dBm PRF = -5dBm PRF = -10dBm PRF = -5dBm LO2 selected LO1 selected 42 42 0.18 dB 0.4 +3 69 64 88 78 49 50 -45 -33 54 50 20 22 dB 34 22 dB dB dBm dBm dB ns dB dBc dBm LO Port Return Loss LO1/2 port unselected, LO2/1 and IF terminated IF Port Return Loss LO driven at 0dBm, RF terminated into 50, differential 200 All limits include external component losses. Output measurements taken at IF output of the Typical Application Circuit. Operation outside this range is possible, but with degraded performance of some parameters. Compression point characterized. It is advisable not to operate continuously the mixer RF input above +12dBm. Measured with external LO source noise filtered so the noise floor is -174dBm/Hz. This specification reflects the effects of all SNR degradations in the mixer, including the LO noise as defined in Maxim Application Note 2021. Note 5: Guaranteed by design and characterization. Note 1: Note 2: Note 3: Note 4: _______________________________________________________________________________________ 3 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Typical Operating Characteristics (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) CONVERSION GAIN vs. RF FREQUENCY MAX9986A toc01 CONVERSION GAIN vs. RF FREQUENCY MAX9986A toc02 CONVERSION GAIN vs. RF FREQUENCY MAX9986A toc03 10 TC = -40C 9 CONVERSION GAIN (dB) 10 10 9 CONVERSION GAIN (dB) 9 CONVERSION GAIN (dB) 8 TC = -25C 8 8 7 TC = +85C 6 TC = +25C 7 PLO = -3dBm, 0dBm, +3dBm 7 VCC = 4.75V, 5.0V, 5.25V 6 6 5 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) 5 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) 5 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) INPUT IP3 vs. RF FREQUENCY MAX9986A toc04 INPUT IP3 vs. RF FREQUENCY MAX9986A toc05 INPUT IP3 vs. RF FREQUENCY MAX9986A toc06 28 27 26 25 24 23 TC = -25C 22 21 740 790 840 890 940 990 TC = -40C TC = +25C TC = +85C 28 27 26 25 24 PLO = -3dBm, 0dBm, +3dBm 23 22 21 28 27 26 25 24 VCC = 5.25V 23 22 21 VCC = 5.0V VCC = 4.75V INPUT IP3 (dBm) INPUT IP3 (dBm) 1040 740 790 840 890 940 990 1040 INPUT IP3 (dBm) 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) RF FREQUENCY (MHz) RF FREQUENCY (MHz) NOISE FIGURE vs. RF FREQUENCY MAX9986A toc07 NOISE FIGURE vs. RF FREQUENCY MAX9986A toc08 NOISE FIGURE vs. RF FREQUENCY VCC = 5.25V 11 NOISE FIGURE (dB) 10 VCC = 5.0V 9 VCC = 4.75V 8 7 6 IF = 190MHz MAX9986A toc09 12 TC = +25C 11 NOISE FIGURE (dB) 10 9 8 7 IF = 190MHz 6 750 800 850 900 950 TC = -40C TC = -25C TC = +85C 12 PLO = -3dBm, 0dBm 11 NOISE FIGURE (dB) 10 9 8 7 6 PLO = +3dBm IF = 190MHz 12 1000 750 800 850 900 950 1000 750 800 850 900 950 1000 RF FREQUENCY (MHz) RF FREQUENCY (MHz) RF FREQUENCY (MHz) 4 _______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) 2LO - 2RF RESPONSE vs. RF FREQUENCY MAX9986A toc10 2LO - 2RF RESPONSE vs. RF FREQUENCY MAX9986A toc11 2LO - 2RF RESPONSE vs. RF FREQUENCY PRF = -5dBm 2LO - 2RF RESPONSE (dBc) 75 VCC = 5.25V MAX9986A toc12 MAX9986A toc18 MAX9986A toc15 85 PRF = -5dBm 2LO - 2RF RESPONSE (dBc) TC = -25C 75 TC = +85C 85 PRF = -5dBm 2LO - 2RF RESPONSE (dBc) 75 PLO = 0dBm 65 85 65 TC = -40C 55 TC = +25C 65 55 PLO = +3dBm 45 PLO = -3dBm 55 VCC = 4.75V 45 VCC = 5.0V 45 740 790 840 890 940 990 1040 FUNDAMENTAL RF FREQUENCY (MHz) 740 790 840 890 940 990 1040 740 790 840 890 940 990 1040 FUNDAMENTAL RF FREQUENCY (MHz) FUNDAMENTAL RF FREQUENCY (MHz) 3LO - 3RF RESPONSE vs. RF FREQUENCY MAX9986A toc13 3LO - 3RF RESPONSE vs. RF FREQUENCY PRF = -5dBm 3LO - 3RF RESPONSE (dBc) 85 PLO = 0dBm, +3dBm MAX9986A toc14 3LO - 3RF RESPONSE vs. RF FREQUENCY 95 PRF = -5dBm 3LO - 3RF RESPONSE (dBc) 85 VCC = 5.25V VCC = 5.0V 95 TC = +85C 3LO - 3RF RESPONSE (dBc) TC = -25C 85 PRF = -5dBm 95 75 TC = -40C 65 TC = +25C 75 PLO = -3dBm 65 75 VCC = 4.75V 65 55 740 790 840 890 940 990 1040 FUNDAMENTAL RF FREQUENCY (MHz) 55 740 790 840 890 940 990 1040 FUNDAMENTAL RF FREQUENCY (MHz) 55 740 790 840 890 940 990 1040 FUNDAMENTAL RF FREQUENCY (MHz) INPUT P1dB vs. RF FREQUENCY MAX9986A toc16 INPUT P1dB vs. RF FREQUENCY MAX9986A toc17 INPUT P1dB vs. RF FREQUENCY 17 VCC = 5.25V 16 INPUT P1dB (dBm) 15 14 13 12 11 10 17 TC = +85C 16 INPUT P1dB (dBm) 15 14 13 12 11 10 740 790 840 890 940 990 TC = -25C TC = -40C TC = +25C 17 16 INPUT P1dB (dBm) 15 14 13 12 11 10 PLO = -3dBm, 0dBm, +3dBm VCC = 4.75V VCC = 5.0V 1040 740 790 840 890 940 990 1040 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) RF FREQUENCY (MHz) RF FREQUENCY (MHz) _______________________________________________________________________________________ 5 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) LO SWITCH ISOLATION vs. LO FREQUENCY MAX9986A toc19 LO SWITCH ISOLATION vs. LO FREQUENCY MAX9986A toc20 LO SWITCH ISOLATION vs. LO FREQUENCY MAX9986A toc21 60 60 PLO = -3dBm, 0dBm LO SWITCH ISOLATION (dB) 55 60 LO SWITCH ISOLATION (dB) 55 LO SWITCH ISOLATION (dB) TC = -40C, -25C 55 50 50 50 45 TC = +85C TC = +25C 45 PLO = +3dBm 45 VCC = 4.75V, 5.0V, 5.25V 40 700 800 900 1000 1100 1200 LO FREQUENCY (MHz) 40 700 800 900 1000 1100 1200 LO FREQUENCY (MHz) 40 700 800 900 1000 1100 1200 LO FREQUENCY (MHz) LO LEAKAGE AT IF PORT vs. LO FREQUENCY MAX9986A toc22 LO LEAKAGE AT IF PORT vs. LO FREQUENCY MAX9986A toc23 LO LEAKAGE AT IF PORT vs. LO FREQUENCY MAX9986A toc24 -20 -20 -20 LO LEAKAGE AT IF PORT (dBm) LO LEAKAGE AT IF PORT (dBm) TC = -25C -30 LO LEAKAGE AT IF PORT (dBm) TC = -40C VCC = 5.25V -30 -30 PLO = 0dBm PLO = -3dBm -40 PLO = +3dBm -40 TC = +85C TC = +25C -40 VCC = 4.75V VCC = 5.0V -50 900 950 1000 1050 1100 1150 1200 LO FREQUENCY (MHz) -50 900 950 1000 1050 1100 1150 1200 LO FREQUENCY (MHz) -50 900 950 1000 1050 1100 1150 1200 LO FREQUENCY (MHz) LO LEAKAGE AT RF PORT vs. LO FREQUENCY MAX9986A toc25 LO LEAKAGE AT RF PORT vs. LO FREQUENCY MAX9986A toc26 LO LEAKAGE AT RF PORT vs. LO FREQUENCY MAX9986A toc27 -20 LO LEAKAGE AT RF PORT (dBm) -20 LO LEAKAGE AT RF PORT (dBm) -20 LO LEAKAGE AT RF PORT (dBm) TC = -40C, -25C -30 TC = +25C TC = -40C -30 PLO = +3dBm PLO = 0dBm -30 VCC = 5.25V -40 TC = +85C -50 900 950 1000 1050 1100 1150 1200 LO FREQUENCY (MHz) -40 PLO = -3dBm -40 VCC = 5.0V VCC = 4.75V -50 900 950 1000 1050 1100 1150 1200 LO FREQUENCY (MHz) -50 900 950 1000 1050 1100 1150 1200 LO FREQUENCY (MHz) 6 _______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) LO LEAKAGE AT IF PORT OVER FREQUENCY vs. LEXT MAX9986A toc28 RF-TO-IF ISOLATION vs. RF FREQUENCY MAX9986A toc29 RF-TO-IF ISOLATION vs. RF FREQUENCY PLO = +3dBm RF-TO-IF ISOLATION (dB) MAX9986A toc30 0 L3 = 0 LO LEAKAGE AT IF PORT (dBm) -10 60 TC = +25C TC = +85C RF-TO-IF ISOLATION (dB) 50 60 L3 = 4.7nH L3 = 10nH TC = -25C TC = -40C 50 PLO = dBm PLO = -3dBm -20 40 40 -30 L3 = 22nH -40 900 950 L3 = 30nH 1000 1050 L3 = 15nH 1100 1150 1200 30 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) 30 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) LO FREQUENCY (MHz) RF-TO-IF ISOLATION vs. RF FREQUENCY MAX9986A toc31 RF-TO-IF ISOLATION OVER FREQUENCY vs. LEXT 60 RF-TO-IF ISOLATION (dB) 50 40 30 20 10 L3 = 10nH L3 = 4.7nH L3 = 0 L3 = 15nH L3 = 22nH L3 = 30nH MAX9986A toc32 RF PORT RETURN LOSS vs. RF FREQUENCY 5 RF PORT RETURN LOSS (dB) 10 15 20 25 30 35 40 PLO = -3dBm, 0dBm, +3dBm MAX9986A toc33 60 70 0 RF-TO-IF ISOLATION (dB) 50 VCC = 4.75V, 5.0V, 5.25V 40 30 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) 0 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) 500 700 900 1100 1300 1500 RF FREQUENCY (MHz) IF PORT RETURN LOSS vs. IF FREQUENCY MAX9986A toc34 LO SELECTED RETURN LOSS vs. LO FREQUENCY MAX9986A toc35 0 0 LO SELECTED RETURN LOSS (dB) IF PORT RETURN LOSS (dB) 10 VCC = 4.75V, 5.0V, 5.25V 10 PLO = 0dBm 20 PLO = +3dBm 20 30 30 PLO = -3dBm 40 40 50 50 100 150 200 250 300 350 IF FREQUENCY (MHz) 50 600 800 1000 1200 1400 1600 LO FREQUENCY (MHz) _______________________________________________________________________________________ 7 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) LO UNSELECTED RETURN LOSS vs. LO FREQUENCY MAX9986A toc36 SUPPLY CURRENT vs. TEMPERATURE (TC) VCC = 5.25V SUPPLY CURRENT (mA) 220 MAX9986A toc37 0 LO UNSELECTED RETURN LOSS (dB) 230 10 PLO = -3dBm, 0dBm, +3dBm 20 210 VCC = 5.0V 200 VCC = 4.75V 30 40 50 600 800 1000 1200 1400 1600 LO FREQUENCY (MHz) 190 -40 -15 10 35 60 85 TEMPERATURE (C) Pin Description PIN 1, 6, 8, 14 2 3 4, 5, 10, 12, 13, 17 7 9 11 15 16 NAME VCC RF TAP GND LOBIAS LOSEL LO1 LO2 LEXT FUNCTION Power-Supply Connection. Bypass each VCC pin to GND with capacitors as shown in the Typical Application Circuit. Single-Ended 50 RF Input. This port is internally matched and DC shorted to GND through a balun. Requires an external DC-blocking capacitor. Center Tap of the Internal RF Balun. Bypass to GND with capacitors close to the IC, as shown in the Typical Application Circuit. Ground Bias Resistor for Internal LO Buffer. Connect a 619 1% resistor from LOBIAS to the power supply. Local Oscillator Select. Logic control input for selecting LO1 or LO2. Local Oscillator Input 1. Drive LOSEL low to select LO1. Local Oscillator Input 2. Drive LOSEL high to select LO2. External Inductor Connection. Short LEXT to ground using a 0 resistor. For applications requiring improved RF-to-IF and LO-to-IF isolation, connect a low-ESR inductor from LEXT to GND. See the Applications Information section regarding stability issues when using an LEXT inductor. Differential IF Outputs. Each output requires external bias to VCC through an RF choke (see the Typical Application Circuit). IF Bias Resistor Connection for IF Amplifier. Connect a 953 1% resistor from IFBIAS to GND. Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias. 18, 19 20 EP IF-, IF+ IFBIAS GND Detailed Description The MAX9986A high-linearity downconversion mixer provides 8.2dB of conversion gain and +25dBm of IIP3, with a typical 10dB noise figure. The integrated baluns and matching circuitry allow for 50 single8 ended interfaces to the RF and the two LO ports. A single-pole, double-throw (SPDT) switch provides 50ns switching time between the two LO inputs with 49dB of LO-to-LO isolation. Furthermore, the integrated LO buffer provides a high drive level to the mixer core, reducing the LO drive required at the MAX9986A's _______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch inputs to a -3dBm to +3dBm range. The IF port incorporates a differential output, which is ideal for providing enhanced IIP2 performance. Specifications are guaranteed over broad frequency ranges to allow for use in cellular band GSM, cdma2000, iDEN, and WCDMA 2G/2.5G/3G base stations. The MAX9986A is specified to operate over a 815MHz to 1000MHz RF frequency range, a 960MHz to 1180MHz LO frequency range, and a 50MHz to 250MHz IF frequency range. Operation beyond these ranges is possible; see the Typical Operating Characteristics for additional details. Differential IF Output Amplifier The MAX9986A mixer has a 50MHz to 250MHz IF frequency range. The differential, open-collector IF output ports require external pullup inductors to VCC. Note that these differential outputs are ideal for providing enhanced 2LO - 2RF rejection performance. Singleended IF applications require a 4:1 balun to transform the 200 differential output impedance to a 50 singleended output. MAX9986A Applications Information Input and Output Matching The RF and LO inputs are internally matched to 50. No matching components are required. RF and LO inputs require only DC-blocking capacitors for interfacing. The IF output impedance is 200 (differential). For evaluation, an external low-loss 4:1 (impedance ratio) balun transforms this impedance down to a 50 singleended output (see the Typical Application Circuit). RF Input and Balun The MAX9986A RF input is internally matched to 50, requiring no external matching components. A DCblocking capacitor is required because the input is internally DC shorted to ground through the on-chip balun. LO Inputs, Buffer, and Balun The MAX9986A is ideally suited for high-side LO injection applications with a 960MHz to 1180MHz LO frequency range. For a device with a 570MHz to 850MHz LO frequency range, refer to the MAX9984 data sheet. As an added feature, the MAX9986A includes an internal LO SPDT switch that can be used for frequencyhopping applications. The switch selects one of the two single-ended LO ports, allowing the external oscillator to settle on a particular frequency before it is switched in. LO switching time is typically less than 50ns, which is more than adequate for virtually all GSM applications. If frequency hopping is not employed, set the switch to either of the LO inputs. The switch is controlled by a digital input (LOSEL): logic-high selects LO2, logic-low selects LO1. To avoid damage to the part, voltage must be applied to VCC before digital logic is applied to LOSEL. LO1 and LO2 inputs are internally matched to 50, requiring only an 82pF DCblocking capacitor. A two-stage internal LO buffer allows a wide input power range for the LO drive. All guaranteed specifications are for an LO signal power from -3dBm to +3dBm. The on-chip low-loss balun, along with an LO buffer, drives the double-balanced mixer. All interfacing and matching components from the LO inputs to the IF outputs are integrated on-chip. Bias Resistors Bias currents for the LO buffer and the IF amplifier are optimized by fine tuning resistors R1 and R2. If reduced current is required at the expense of performance, contact the factory for details. If the 1% bias resistor values are not readily available, substitute standard 5% values. LEXT Inductor Short LEXT to ground using a 0 resistor. For applications requiring improved RF-to-IF and LO-to-IF isolation, LEXT can be used by connecting a low-ESR inductor from LEXT to GND. See the Typical Operating Characteristics on RF-to-IF isolation and LO-to-IF leakage for various inductor values. However, the load impedance presented to the mixer must be such that any capacitance from both IF- and IF+ to ground do not exceed several picofarads to ensure stable operating conditions. Since approximately 140mA flows through LEXT, it is important to use a low DCR wire-wound inductor. Layout Considerations A properly designed PC board is an essential part of any RF/microwave circuit. Keep RF signal lines as short as possible to reduce losses, radiation, and inductance. For the best performance, route the ground pin traces directly to the exposed pad under the package. The PC board exposed pad MUST be connected to the ground plane of the PC board. It is suggested that multiple vias be used to connect this pad to the lower level ground planes. This method provides a good RF/thermal conduction path for the device. Solder the exposed pad on the bottom of the device package to the PC board. The MAX9986A Evaluation Kit can be used as a 9 High-Linearity Mixer The core of the MAX9986A is a double-balanced, highperformance passive mixer. Exceptional linearity is provided by the large LO swing from the on-chip LO buffer. When combined with the integrated IF amplifiers, the cascaded IIP3, 2LO - 2RF rejection, and NF performance is typically 25dBm, 69dBc, and 10dB, respectively. _______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A reference for board layout. Gerber files are available upon request at www.maxim-ic.com. Exposed Pad RF/Thermal Considerations The exposed paddle (EP) of the MAX9986A's 20-pin thin QFN-EP package provides a low thermal-resistance path to the die. It is important that the PC board on which the MAX9986A is mounted be designed to conduct heat from the EP. In addition, provide the EP with a low-inductance path to electrical ground. The EP MUST be soldered to a ground plane on the PC board, either directly or through an array of plated via holes. Power-Supply Bypassing Proper voltage-supply bypassing is essential for highfrequency circuit stability. Bypass each VCC pin and TAP with the capacitors shown in the Typical Application Circuit; see Table 1. Place the TAP bypass capacitor to ground within 100 mils of the TAP pin. Table 1. Component List Referring to the Typical Application Circuit COMPONENT L1, L2 L3* C1 C2, C4, C7, C8, C10, C11, C12 C3, C5, C6, C9, C13, C14 C15 R1 R2 R3 T1 U1 VALUE 330nH 30nH 10pF 82pF 0.01F 220pF 953 619 0 4:1 balun MAX9986A DESCRIPTION Wire-wound high-Q inductors (0805) Wire-wound high-Q inductor (0603) Microwave capacitor (0603) Microwave capacitors (0603) Microwave capacitors (0603) Microwave capacitor (0402) 1% resistor (0603) 1% resistor (0603) 1% resistor (1206) IF balun TC4-1W-7A Maxim IC *Use L3 for improved RF-to-IF and LO-to-IF isolation. See the Applications Information section regarding stability issues when using L3 inductor. Pin Configuration/Functional Diagram IFBIAS LEXT 16 GND 17 IF+ 19 IF18 20 VCC 1 RF 2 TAP 3 GND 4 GND 5 MAX9986A 15 LO2 14 VCC 13 GND 12 GND 11 LO1 6 VCC 7 LOBIAS 8 VCC 9 LOSEL 10 GND THIN QFN 10 ______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Typical Application Circuit VCC T1 3 R3 L1 C13 C14 L2 R1 IFBIAS C15 1 L3* LEXT GND IF+ IF4 2 6 IF OUTPUT VCC 20 19 18 17 16 C3 C1 RF INPUT C5 C2 VCC RF TAP C12 1 MAX9986A 2 3 4 5 14 13 12 11 15 LO2 VCC GND GND C10 LO1 LO1 INPUT C11 LO2 INPUT VCC C4 GND GND 6 LOBIAS VCC 7 VCC 8 LOSEL 9 10 GND R2 VCC C6 C7 LOSEL INPUT C8 C9 VCC *USE L3 FOR IMPROVED RF-TO-IF AND LO-TO-IF ISOLATION. SEE THE Applications Information SECTION REGARDING STABILITY ISSUES WHEN USING L3 INDUCTOR. Chip Information TRANSISTOR COUNT: 1017 PROCESS: SiGe BiCMOS ______________________________________________________________________________________ 11 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch MAX9986A Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) QFN THIN.EPS L D2 D D/2 MARKING k L E/2 E2/2 E (NE-1) X e C L C L b D2/2 0.10 M C A B AAAAA E2 PIN # 1 I.D. DETAIL A e (ND-1) X e e/2 PIN # 1 I.D. 0.35x45 DETAIL B e L1 L C L C L L e 0.10 C A 0.08 C e C A1 A3 PACKAGE OUTLINE, 16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm -DRAWING NOT TO SCALE- 21-0140 I 1 2 COMMON DIMENSIONS PKG. 16L 5x5 20L 5x5 28L 5x5 32L 5x5 40L 5x5 SYMBOL MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. MIN. NOM. MAX. EXPOSED PAD VARIATIONS PKG. CODES T1655-2 T1655-3 T1655N-1 T2055-3 D2 3.10 3.10 3.10 3.10 3.10 3.25 3.25 2.70 2.70 3.25 2.70 3.25 3.25 3.10 3.10 3.10 3.10 3.30 3.20 3.20 3.20 3.20 3.20 3.35 3.35 2.80 2.80 3.35 2.80 3.35 3.35 3.20 3.20 3.20 3.20 3.40 3.00 3.00 3.00 3.00 3.00 3.15 3.15 2.60 2.60 3.15 2.60 3.15 3.15 3 3.00 3 3.00 3.00 3.00 3.20 E2 exceptions L A A1 A3 b D E e k L MIN. NOM. MAX. MIN. NOM. MAX. -0.15 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0.70 0.75 0.80 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0 0.02 0.05 0.20 REF. 0.20 REF. 0.20 REF. 0.20 REF. 0.20 REF. 0.25 0.30 0.35 0.25 0.30 0.35 0.20 0.25 0.30 0.20 0.25 0.30 0.15 0.20 0.25 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 4.90 5.00 5.10 0.80 BSC. 0.65 BSC. 0.50 BSC. 0.40 BSC. 0.50 BSC. DOWN BONDS ALLOWED 0.25 - 0.25 - 0.25 - 0.25 - 0.25 0.35 0.45 0.30 0.40 0.50 0.45 0.55 0.65 0.45 0.55 0.65 0.30 0.40 0.50 0.40 0.50 0.60 L1 - 0.30 0.40 0.50 16 40 N 20 28 32 ND 4 10 5 7 8 4 10 5 7 8 NE WHHB ----WHHC WHHD-1 WHHD-2 JEDEC NOTES: 1. DIMENSIONING & TOLERANCING CONFORM TO ASME Y14.5M-1994. 2. ALL DIMENSIONS ARE IN MILLIMETERS. ANGLES ARE IN DEGREES. 3. N IS THE TOTAL NUMBER OF TERMINALS. 4. THE TERMINAL #1 IDENTIFIER AND TERMINAL NUMBERING CONVENTION SHALL CONFORM TO JESD 95-1 SPP-012. DETAILS OF TERMINAL #1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE ZONE INDICATED. THE TERMINAL #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE. 5. DIMENSION b APPLIES TO METALLIZED TERMINAL AND IS MEASURED BETWEEN 0.25 mm AND 0.30 mm FROM TERMINAL TIP. 3.00 3.00 3.00 3.00 3.00 T2055-4 T2055-5 3.15 T2855-3 3.15 T2855-4 2.60 T2855-5 2.60 3.15 T2855-6 T2855-7 2.60 T2855-8 3.15 T2855N-1 3.15 T3255-3 3.00 T3255-4 3.00 T3255-5 3.00 T3255N-1 3.00 T4055-1 3.20 3.10 3.10 3.10 3.10 3.10 3.25 3.25 2.70 2.70 3.25 2.70 3.25 3.25 3.10 3.10 3.10 3.10 3.30 3.20 3.20 3.20 3.20 3.20 3.35 3.35 2.80 2.80 3.35 2.80 3.35 3.35 3.20 3.20 3.20 3.20 3.40 ** ** ** ** ** 0.40 ** ** ** ** ** 0.40 ** ** ** ** ** ** YES NO NO YES NO YES YES YES NO NO YES YES NO YES NO YES NO YES ** SEE COMMON DIMENSIONS TABLE 6. ND AND NE REFER TO THE NUMBER OF TERMINALS ON EACH D AND E SIDE RESPECTIVELY. 7. DEPOPULATION IS POSSIBLE IN A SYMMETRICAL FASHION. 8. COPLANARITY APPLIES TO THE EXPOSED HEAT SINK SLUG AS WELL AS THE TERMINALS. 9. DRAWING CONFORMS TO JEDEC MO220, EXCEPT EXPOSED PAD DIMENSION FOR T2855-3 AND T2855-6. 10. WARPAGE SHALL NOT EXCEED 0.10 mm. 11. MARKING IS FOR PACKAGE ORIENTATION REFERENCE ONLY. 12. NUMBER OF LEADS SHOWN ARE FOR REFERENCE ONLY. 13. LEAD CENTERLINES TO BE AT TRUE POSITION AS DEFINED BY BASIC DIMENSION "e", -0.05. PACKAGE OUTLINE, 16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm -DRAWING NOT TO SCALE- 21-0140 I 2 2 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. |
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