KIT ATION EVALU E L B A IL AVA 19-3906; Rev 0; 1/06 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch Features 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 -40°C to +85°C temperature range. ♦ 815MHz to 1000MHz RF Frequency Range ♦ 960MHz to 1180MHz LO Frequency Range (MAX9986A/MAX9986) ♦ 570MHz to 850MHz LO Frequency Range (MAX9984) ♦ 50MHz to 250MHz IF Frequency Range ♦ 8.2dB Conversion Gain ♦ +25dBm Input IP3 ♦ +14.8dBm Input 1dB Compression Point ♦ 10dB Noise Figure ♦ 69dBc 2LO - 2RF Spurious Rejection at PRF = -10dBm ♦ Integrated LO Buffer ♦ Integrated RF and LO Baluns for Single-Ended Inputs ♦ Low -3dBm to +3dBm LO Drive ♦ Built-In SPDT LO Switch with 49dB LO1 to LO2 Isolation and 50ns Switching Time ♦ Pin Compatible with MAX9994/MAX9996 1700MHz to 3000MHz Mixers ♦ Functionally Compatible with MAX9993 ♦ External Current-Setting Resistors Provide Option for Operating Mixer in Reduced Power/Reduced Performance Mode ♦ Lead-Free Package Available Applications Ordering Information 850MHz WCDMA Base Stations GSM 850/GSM 900 2G and 2.5G EDGE Base Stations cdmaOne™ and cdma2000® Base Stations iDEN® Base Stations Predistortion Receivers Fixed Broadband Wireless Access PART TEMP RANGE PIN-PACKAGE -40°C to +85°C 20 Thin QFN-EP* T2055-3 5mm × 5mm MAX9986AETP-T -40°C to +85°C 20 Thin QFN-EP* T2055-3 5mm × 5mm MAX9986AETP+ -40°C to +85°C 20 Thin QFN-EP* T2055-3 5mm × 5mm MAX9986AETP+T -40°C to +85°C 20 Thin QFN-EP* T2055-3 5mm × 5mm MAX9986AETP 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. PKG CODE *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 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. 1 MAX9986A General Description MAX9986A SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch ABSOLUTE MAXIMUM RATINGS θJA .................................................................................+38°C/W θJC .................................................................................+13°C/W Operating Temperature Range (Note A) ....TC = -40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C 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 = +70°C) 20-Pin Thin QFN-EP (derate 26.3mW/°C above +70°C)...........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. 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 = 953Ω, R2 = 619Ω, TC = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, TC = +25°C, unless otherwise noted.) PARAMETER SYMBOL Supply Voltage VCC Supply Current ICC LO_SEL Input-Logic Low VIL LO_SEL Input-Logic High VIH CONDITIONS MIN TYP MAX UNITS 4.75 5.00 5.25 V 213 250 mA 0.8 V 2 V AC ELECTRICAL CHARACTERISTICS (MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 815MHz to 1000MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF = 160MHz, TC = +25°C, unless otherwise noted.) (Note 1) PARAMETER RF Frequency Range LO Frequency Range SYMBOL fRF fLO CONDITIONS MIN TYP MAX UNITS MHz (Note 2) 815 1000 (Note 2) 960 1180 MAX9984 570 850 IF Frequency Range fIF (Note 2) 50 Conversion Gain GC TC = +25°C 7.2 250 8.2 9.3 MHz MHz dB Gain Variation Over Temperature TC = -40°C to +85°C -0.009 dB/°C Conversion Gain Flatness Flatness over any one of three frequency bands: fRF = 824MHz to 849MHz fRF = 869MHz to 894MHz fRF = 880MHz to 915MHz ±0.15 dB 14.8 dBm 25 dBm Input Compression Point Input Third-Order Intercept Point Input IP3 Variation Over Temperature 2 P1dB (Note 3) IIP3 Two tones: fRF1 = 910MHz, fRF2 = 911MHz, PRF = -5dBm/tone, fLO = 1070MHz, PLO = 0dBm, TA = +25°C 22 TC = +25°C to -40°C -1.8 TC = +25°C to +85°C +0.7 _______________________________________________________________________________________ dB SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch (MAX9986A Typical Application Circuit, VCC = +4.75V to +5.25V, RF and LO ports are driven from 50Ω sources, PLO = -3dBm to +3dBm, PRF = -5dBm, fRF = 815MHz to 1000MHz, fLO = 960MHz to 1180MHz, fIF = 160MHz, fLO > fRF, TC = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +5V, PRF = -5dBm, PLO = 0dBm, fRF = 910MHz, fLO = 1070MHz, fIF = 160MHz, TC = +25°C, 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) Noise Figure Under-Blocking MIN PBLOCKER = +8dBm 2LO - 2RF 3x3 3LO - 3RF dB dB 23 0.18 dB 0.4 -3 2x2 UNITS 20 PBLOCKER = +11dBm LO Drive Spurious Response at IF MAX 10 PBLOCKER = PFUNDAMENTAL = -5dBm +8dBm fFUNDAMENTAL = 910MHz PBLOCKER = fBLOCKER = 911MHz +11dBm Small-Signal Compression Under-Blocking Condition TYP PRF = -10dBm +3 dBm 69 PRF = -5dBm 64 PRF = -10dBm 88 PRF = -5dBm 78 LO2 selected 42 49 LO1 selected 42 50 dBc LO1-to-LO2 Isolation PLO = +3dBm TC = +25°C (Note 5) LO Leakage at RF Port PLO = +3dBm -45 dBm LO Leakage at IF Port PLO = +3dBm -33 dBm 54 dB 50 ns 20 dB RF-to-IF Isolation LO Switching Time 50% of LOSEL to IF settled to within 2° RF Port Return Loss LO1/2 port selected, LO2/1 and IF terminated 22 LO1/2 port unselected, LO2/1 and IF terminated 34 LO driven at 0dBm, RF terminated into 50Ω, differential 200Ω 22 LO Port Return Loss IF Port Return Loss dB dB dB 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 MAX9986A AC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) TC = +85°C 6 8 7 PLO = -3dBm, 0dBm, +3dBm 790 840 890 940 990 740 790 840 RF FREQUENCY (MHz) INPUT IP3 vs. RF FREQUENCY 890 940 990 MAX9986A toc03 740 1040 790 INPUT IP3 vs. RF FREQUENCY 25 24 23 940 990 1040 INPUT IP3 vs. RF FREQUENCY 27 INPUT IP3 (dBm) 26 890 28 MAX9986A toc05 TC = +85°C 840 RF FREQUENCY (MHz) 28 MAX9986A toc04 TC = +25°C VCC = 4.75V, 5.0V, 5.25V RF FREQUENCY (MHz) 28 27 7 5 5 1040 26 27 INPUT IP3 (dBm) 740 8 6 6 5 INPUT IP3 (dBm) 9 CONVERSION GAIN (dB) TC = -25°C TC = +25°C 7 9 CONVERSION GAIN (dB) CONVERSION GAIN (dB) 8 10 MAX9986A toc02 MAX9986A toc01 TC = -40°C 9 CONVERSION GAIN vs. RF FREQUENCY CONVERSION GAIN vs. RF FREQUENCY 10 25 24 PLO = -3dBm, 0dBm, +3dBm MAX9986A toc06 CONVERSION GAIN vs. RF FREQUENCY 10 VCC = 4.75V 26 25 24 VCC = 5.25V 23 23 22 22 VCC = 5.0V TC = -25°C 21 21 840 890 940 990 1040 21 740 790 840 RF FREQUENCY (MHz) NOISE FIGURE vs. RF FREQUENCY 1040 740 790 PLO = -3dBm, 0dBm TC = -25°C 7 10 9 890 940 990 1040 NOISE FIGURE vs. RF FREQUENCY IF = 190MHz 11 NOISE FIGURE (dB) 9 840 RF FREQUENCY (MHz) 12 MAX9986A toc07 TC = +85°C 10 TC = -40°C 990 NOISE FIGURE vs. RF FREQUENCY 11 8 940 RF FREQUENCY (MHz) 12 TC = +25°C 890 12 PLO = +3dBm 8 7 IF = 190MHz VCC = 5.25V 11 NOISE FIGURE (dB) 790 MAX9986A toc08 740 MAX9986A toc09 TC = -40°C 22 NOISE FIGURE (dB) MAX9986A SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch 10 VCC = 5.0V 9 VCC = 4.75V 8 7 IF = 190MHz 6 6 750 800 850 900 RF FREQUENCY (MHz) 4 950 1000 6 750 800 850 900 RF FREQUENCY (MHz) 950 1000 750 800 850 900 RF FREQUENCY (MHz) _______________________________________________________________________________________ 950 1000 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch 65 PLO = -3dBm 55 TC = +25°C 890 940 990 1040 FUNDAMENTAL RF FREQUENCY (MHz) 85 75 TC = +25°C TC = -40°C 890 940 990 1040 740 65 3LO - 3RF RESPONSE vs. RF FREQUENCY PRF = -5dBm 55 PLO = 0dBm, +3dBm 85 840 890 940 990 75 PLO = -3dBm 65 1040 13 840 890 940 990 16 INPUT P1dB (dBm) TC = -25°C 14 TC = -40°C 1040 740 PLO = -3dBm, 0dBm, +3dBm 13 10 RF FREQUENCY (MHz) 990 1040 990 1040 VCC = 5.25V 15 14 VCC = 4.75V 13 11 940 940 16 11 890 890 17 11 840 840 INPUT P1dB vs. RF FREQUENCY 15 14 790 FUNDAMENTAL RF FREQUENCY (MHz) 12 790 MAX9986A toc12 VCC = 4.75V 65 12 740 VCC = 5.0V 75 12 10 1040 VCC = 5.25V 85 INPUT P1dB vs. RF FREQUENCY 15 990 PRF = -5dBm MAX9986A toc17 TC = +25°C 790 17 MAX9986A toc16 TC = +85°C 940 3LO - 3RF RESPONSE vs. RF FREQUENCY FUNDAMENTAL RF FREQUENCY (MHz) INPUT P1dB vs. RF FREQUENCY 16 890 55 740 FUNDAMENTAL RF FREQUENCY (MHz) 17 840 95 55 790 790 FUNDAMENTAL RF FREQUENCY (MHz) INPUT P1dB (dBm) 3LO - 3RF RESPONSE (dBc) TC = -25°C 840 95 3LO - 3RF RESPONSE (dBc) PRF = -5dBm MAX9986A toc13 3LO - 3RF RESPONSE vs. RF FREQUENCY TC = +85°C 790 FUNDAMENTAL RF FREQUENCY (MHz) 95 740 VCC = 5.0V 55 45 740 3LO - 3RF RESPONSE (dBc) 840 MAX9986A toc14 790 65 VCC = 4.75V 45 740 VCC = 5.25V 75 PLO = +3dBm 45 INPUT P1dB (dBm) MAX9986A toc11 PLO = 0dBm MAX9986A toc15 TC = -40°C 55 75 PRF = -5dBm MAX9986A toc18 65 PRF = -5dBm 85 2LO - 2RF RESPONSE (dBc) TC = +85°C 85 2LO - 2RF RESPONSE (dBc) TC = -25°C 75 MAX9986A toc10 2LO - 2RF RESPONSE (dBc) PRF = -5dBm 2LO - 2RF RESPONSE vs. RF FREQUENCY 2LO - 2RF RESPONSE vs. RF FREQUENCY 2LO - 2RF RESPONSE vs. RF FREQUENCY 85 VCC = 5.0V 10 740 790 840 890 940 RF FREQUENCY (MHz) 990 1040 740 790 840 890 940 990 1040 RF FREQUENCY (MHz) _______________________________________________________________________________________ 5 MAX9986A Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) TC = -40°C, -25°C 50 45 TC = +85°C TC = +25°C 40 800 900 1000 1100 50 PLO = +3dBm 45 1200 40 700 800 900 1000 1100 1200 700 900 1000 1100 LO LEAKAGE AT IF PORT vs. LO FREQUENCY LO LEAKAGE AT IF PORT vs. LO FREQUENCY PLO = -3dBm -40 PLO = +3dBm -50 950 1000 1050 1100 1150 1200 VCC = 5.25V -30 VCC = 4.75V -40 VCC = 5.0V -50 900 950 1000 1050 1100 1150 1200 900 950 1000 1050 1100 1150 LO FREQUENCY (MHz) LO FREQUENCY (MHz) LO FREQUENCY (MHz) LO LEAKAGE AT RF PORT vs. LO FREQUENCY LO LEAKAGE AT RF PORT vs. LO FREQUENCY LO LEAKAGE AT RF PORT vs. LO FREQUENCY TC = -40°C -40 TC = +85°C PLO = +3dBm PLO = 0dBm -40 PLO = -3dBm -50 1000 -30 VCC = 5.25V -40 VCC = 5.0V VCC = 4.75V -50 950 1200 MAX9986A toc27 MAX9986A toc26 -30 -20 LO LEAKAGE AT RF PORT (dBm) TC = -40°C, -25°C TC = +25°C -20 LO LEAKAGE AT RF PORT (dBm) MAX9986A toc25 -20 1200 MAX9986A toc24 MAX9986A toc23 PLO = 0dBm -30 -20 LO LEAKAGE AT IF PORT (dBm) TC = +25°C LO LEAKAGE AT IF PORT (dBm) MAX9986A toc22 TC = -40°C -20 -50 900 800 LO LEAKAGE AT IF PORT vs. LO FREQUENCY TC = +85°C -30 VCC = 4.75V, 5.0V, 5.25V 45 LO FREQUENCY (MHz) -30 900 50 LO FREQUENCY (MHz) TC = -25°C -40 55 LO FREQUENCY (MHz) -20 LO LEAKAGE AT IF PORT (dBm) 55 40 700 1050 1100 LO FREQUENCY (MHz) 6 MAX9986A toc20 PLO = -3dBm, 0dBm 60 MAX9986A toc21 55 LO SWITCH ISOLATION vs. LO FREQUENCY 60 LO SWITCH ISOLATION (dB) MAX9986A toc19 LO SWITCH ISOLATION (dB) 60 LO SWITCH ISOLATION vs. LO FREQUENCY LO SWITCH ISOLATION (dB) LO SWITCH ISOLATION vs. LO FREQUENCY LO LEAKAGE AT RF PORT (dBm) MAX9986A SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch 1150 1200 -50 900 950 1000 1050 1100 LO FREQUENCY (MHz) 1150 1200 900 950 1000 1050 1100 LO FREQUENCY (MHz) _______________________________________________________________________________________ 1150 1200 SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch RF-TO-IF ISOLATION vs. RF FREQUENCY L3 = 10nH -20 -30 50 PLO = +3dBm RF-TO-IF ISOLATION (dB) TC = +85°C L3 = 4.7nH 60 MAX9986A toc29 TC = +25°C RF-TO-IF ISOLATION (dB) LO LEAKAGE AT IF PORT (dBm) L3 = 0Ω -10 60 MAX9986A toc28 0 RF-TO-IF ISOLATION vs. RF FREQUENCY TC = -25°C TC = -40°C 40 MAX9986A toc30 LO LEAKAGE AT IF PORT OVER FREQUENCY vs. LEXT 50 PLO = dBm PLO = -3dBm 40 L3 = 22nH L3 = 15nH L3 = 30nH 1000 1050 1100 30 1150 1200 790 840 890 940 990 1040 740 890 940 990 RF FREQUENCY (MHz) RF-TO-IF ISOLATION vs. RF FREQUENCY RF-TO-IF ISOLATION OVER FREQUENCY vs. LEXT RF PORT RETURN LOSS vs. RF FREQUENCY L3 = 15nH RF-TO-IF ISOLATION (dB) 60 40 L3 = 22nH L3 = 30nH 50 40 30 20 L3 = 10nH L3 = 4.7nH L3 = 0Ω 0 5 10 15 20 25 35 40 0 840 890 940 990 1040 740 790 840 RF FREQUENCY (MHz) 890 940 990 500 1040 700 RF FREQUENCY (MHz) 1100 1300 1500 LO SELECTED RETURN LOSS vs. LO FREQUENCY VCC = 4.75V, 5.0V, 5.25V 20 30 40 50 0 LO SELECTED RETURN LOSS (dB) MAX9986A toc34 0 10 900 RF FREQUENCY (MHz) IF PORT RETURN LOSS vs. IF FREQUENCY IF PORT RETURN LOSS (dB) PLO = -3dBm, 0dBm, +3dBm 30 10 30 1040 MAX9986A toc33 MAX9986A toc31 70 VCC = 4.75V, 5.0V, 5.25V 790 840 RF FREQUENCY (MHz) 50 740 790 LO FREQUENCY (MHz) 60 RF-TO-IF ISOLATION (dB) 30 740 10 MAX9986A toc35 950 RF PORT RETURN LOSS (dB) 900 MAX9986A toc32 -40 PLO = +3dBm PLO = 0dBm 20 30 PLO = -3dBm 40 50 50 100 150 200 250 IF FREQUENCY (MHz) 300 350 600 800 1000 1200 1400 1600 LO FREQUENCY (MHz) _______________________________________________________________________________________ 7 MAX9986A Typical Operating Characteristics (continued) (MAX9986A Typical Application Circuit, VCC = +5.0V, PLO = 0dBm, PRF = -5dBm, fLO > fRF, fIF = 160MHz, unless otherwise noted.) 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 SUPPLY CURRENT vs. TEMPERATURE (TC) VCC = 5.25V SUPPLY CURRENT (mA) 10 PLO = -3dBm, 0dBm, +3dBm 20 30 220 210 VCC = 5.0V VCC = 4.75V 200 40 50 MAX9986A toc37 230 MAX9986A toc36 0 LO UNSELECTED RETURN LOSS (dB) MAX9986A SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch 190 600 800 1000 1200 1400 1600 -40 -15 LO FREQUENCY (MHz) 10 35 60 85 TEMPERATURE (°C) Pin Description PIN NAME FUNCTION 1, 6, 8, 14 VCC 2 RF Single-Ended 50Ω RF Input. This port is internally matched and DC shorted to GND through a balun. Requires an external DC-blocking capacitor. 3 TAP Center Tap of the Internal RF Balun. Bypass to GND with capacitors close to the IC, as shown in the Typical Application Circuit. 4, 5, 10, 12, 13, 17 GND Ground 7 LOBIAS Bias Resistor for Internal LO Buffer. Connect a 619Ω ±1% resistor from LOBIAS to the power supply. 9 LOSEL Local Oscillator Select. Logic control input for selecting LO1 or LO2. 11 LO1 Local Oscillator Input 1. Drive LOSEL low to select LO1. 15 LO2 Local Oscillator Input 2. Drive LOSEL high to select LO2. 16 LEXT External Inductor Connection. Short LEXT to ground using a 0Ω 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. 18, 19 IF-, IF+ Differential IF Outputs. Each output requires external bias to VCC through an RF choke (see the Typical Application Circuit). 20 IFBIAS IF Bias Resistor Connection for IF Amplifier. Connect a 953Ω ±1% resistor from IFBIAS to GND. EP GND Power-Supply Connection. Bypass each VCC pin to GND with capacitors as shown in the Typical Application Circuit. Exposed Ground Paddle. Solder the exposed paddle to the ground plane using multiple vias. 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 50Ω 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 RF Input and Balun The MAX9986A RF input is internally matched to 50Ω, 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 50Ω, 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. 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. 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 200Ω differential output impedance to a 50Ω singleended output. Applications Information Input and Output Matching The RF and LO inputs are internally matched to 50Ω. No matching components are required. RF and LO inputs require only DC-blocking capacitors for interfacing. The IF output impedance is 200Ω (differential). For evaluation, an external low-loss 4:1 (impedance ratio) balun transforms this impedance down to a 50Ω singleended output (see the Typical Application Circuit). 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 0Ω 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 MAX9986A 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. 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 VALUE DESCRIPTION L1, L2 330nH Wire-wound high-Q inductors (0805) L3* 30nH Wire-wound high-Q inductor (0603) C1 10pF Microwave capacitor (0603) C2, C4, C7, C8, C10, C11, C12 82pF Microwave capacitors (0603) C3, C5, C6, C9, C13, C14 0.01µF Microwave capacitors (0603) C15 220pF Microwave capacitor (0402) R1 953Ω ±1% resistor (0603) R2 619Ω ±1% resistor (0603) R3 0Ω ±1% resistor (1206) T1 4:1 balun IF balun TC4-1W-7A U1 MAX9986A 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. IFBIAS IF+ IF- GND LEXT Pin Configuration/Functional Diagram 20 19 18 17 16 VCC 1 15 LO2 RF 2 MAX9986A 14 VCC GND 5 11 LO1 6 7 8 9 10 GND 12 GND LOSEL GND 4 VCC 13 GND LOBIAS TAP 3 VCC MAX9986A SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch THIN QFN 10 ______________________________________________________________________________________ SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch VCC T1 3 IF OUTPUT 6 R3 L1 2 L2 C14 C3 C2 GND IF- IF+ 19 20 VCC 18 17 RF C5 TAP C4 GND 16 C12 1 15 C1 RF INPUT 4 L3* IFBIAS VCC 1 C15 R1 LEXT C13 MAX9986A 2 14 3 13 4 12 5 11 LO2 LO2 INPUT VCC VCC C11 GND GND C10 LOSEL LOBIAS VCC 9 LO1 INPUT LO1 10 GND 8 7 6 VCC GND R2 VCC C6 LOSEL INPUT C7 C8 VCC C9 *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 MAX9986A Typical Application Circuit 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 MAX9986A SiGe High-Linearity, 815MHz to 1000MHz Downconversion Mixer with LO Buffer/Switch D2 D MARKING b CL 0.10 M C A B D2/2 D/2 k L AAAAA E/2 E2/2 CL (NE-1) X e E DETAIL A PIN # 1 I.D. E2 PIN # 1 I.D. 0.35x45¡ e/2 e (ND-1) X e DETAIL B e L1 L CL CL L L e e 0.10 C A C 0.08 C A1 A3 PACKAGE OUTLINE, 16, 20, 28, 32, 40L THIN QFN, 5x5x0.8mm -DRAWING NOT TO SCALE- COMMON DIMENSIONS A1 A3 b D E e PKG. CODES 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 1 2 EXPOSED PAD VARIATIONS 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. A I 21-0140 0 0.02 0.05 0 T1655-2 T1655-3 T1655N-1 T2055-3 D2 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 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. 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 k L 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. L E2 exceptions MIN. NOM. MAX. MIN. NOM. MAX. –0.15 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 33.00 33.00 3.00 3.00 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 ** ** ** ** ** ** DOWN BONDS ALLOWED YES NO NO YES NO YES YES YES NO NO YES YES NO YES NO YES NO YES ** SEE COMMON DIMENSIONS TABLE 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. 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 21-0140 -DRAWING NOT TO SCALE- 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 © 2006 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.