LTC6406CUD-TRPBF

LTC6406 3GHz, Low Noise, Rail-to-Rail Input Differential Amplifier/Driver FEATURES n n n DESCRIPTION The LTC®6406 is a very low noise, low distortion, fully differential input/output amplifier optimized for 3V, single supply operation. The LTC6406 input common mode range is rail-to-rail, while the output common mode voltage is independently adjustable by applying a voltage on the VOCM pin. This makes the LTC6406 ideal for level-shifting signals with a wide common mode range for driving 12-bit to 16-bit single supply, differential input ADCs. A 3GHz gain-bandwidth product results in 70dB linearity for 50MHz input signals. The LTC6406 is unity-gain stable and the closed-loop bandwidth extends from DC to 800MHz. The output voltage swing extends from near ground to 2V, to be compatible with a wide range of ADC converter input requirements. The LTC6406 draws only 18mA, and has a hardware shutdown feature which reduces current consumption to 300μA. The LTC6406 is available in a compact 3mm × 3mm 16-pin leadless QFN package as well as an 8-lead MSOP package, and operates over a –40°C to 85°C temperature range. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n n n n n n n n Low Noise: 1.6nV/√Hz RTI Low Power: 18mA at 3V Low Distortion (HD2/HD3): –80dBc/–69dBc at 50MHz, 2VP-P –104dBc/–90dBc at 20MHz, 2VP-P Rail-to-Rail Differential Input 2.7V to 3.5V Supply Voltage Range Fully Differential Input and Output Adjustable Output Common Mode Voltage 800MHz –3dB Bandwidth with AV = 1 Gain-Bandwidth Product: 3GHz Low Power Shutdown Available in 8-Lead MSOP and Tiny 16-Lead 3mm × 3mm × 0.75mm QFN Packages APPLICATIONS n n n n n Differential Input ADC Driver Single-Ended to Differential Conversion Level-Shifting Ground-Referenced Signals Level-Shifting VCC-Referenced Signals High Linearity Direct Conversion Receivers TYPICAL APPLICATION ADC Driver: Single-Ended Input to Differential Output with Common Mode Level Shifting 1.8pF VIN Harmonic Distortion vs Frequency –30 VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 800Ω = 2VP-P V –50 OUTDIFF DIFFERENTIAL INPUTS –60 –70 –80 –90 –100 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω 150Ω 150Ω 3V DISTORTION (dBc) 3V VDD –+ VOCM 1.25V LTC6406 +INA LTC22xx ADC –INA GND +– 150Ω 150Ω 6406 TA01 –110 1 10 FREQUENCY (MHz) 100 6406 TA01b 1.8pF 6406fb 1 LTC6406 ABSOLUTE MAXIMUM RATINGS (Note 1) Total Supply Voltage (V+ to V–) ................................3.5V Input Current +IN, –IN, VOCM, SHDN, VTIP (Note 2) ...............±10mA Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 4) ............................................... –40°C to 85°C Specified Temperature Range (Note 5) LTC6406C ................................................ 0°C to 70°C LTC6406I.............................................. –40°C to 85°C Junction Temperature ........................................... 150°C Storage Temperature Range................... –65°C to 150°C PIN CONFIGURATION TOP VIEW –OUTF –OUT +IN NC 16 15 14 13 SHDN V+ V– VOCM 1 2 3 4 5 VTIP 6 –IN 7 +OUT 8 +OUTF 17 12 V– 11 V+ 10 V+ 9 V– –IN 1 VOCM 2 V+ 3 +OUT 4 TOP VIEW 9 8 7 6 5 +IN SHDN V– –OUT MS8E PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 40°C/W, θJC = 10°C/W EXPOSED PAD (PIN 9) IS V–, MUST BE SOLDERED TO PCB UD PACKAGE 16-LEAD (3mm × 3mm) PLASTIC QFN TJMAX = 150°C, θJA = 68°C/W, θJC = 4.2°C/W EXPOSED PAD (PIN 17) IS V–, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH LTC6406CUD#PBF LTC6406IUD#PBF LTC6406CMS8E#PBF LTC6406IMS8E#PBF TAPE AND REEL LTC6406CUD#TRPBF LTC6406IUD#TRPBF LTC6406CMS8E#TRPBF LTC6406IMS8E#TRPBF PART MARKING* LCTC LCTC LTCTB LTCTB PACKAGE DESCRIPTION 16-Lead (3mm × 3mm) Plastic QFN 16-Lead (3mm × 3mm) Plastic QFN 8-Lead Plastic MSOP 8-Lead Plastic MSOP SPECIFIED TEMPERATURE RANGE 0°C to 70°C –40°C to 85°C 0°C to 70°C –40°C to 85°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 6406fb 2 LTC6406 DC ELECTRICAL CHARACTERISTICS SYMBOL VOSDIFF ΔVOSDIFF/ΔT PARAMETER Differential Offset Voltage (Input Referred) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 3V, V– = 0V, VCM = VOCM = VICM = 1.25V, VSHDN = open, RBAL = 100kΩ, RI = 150Ω, RF = 150Ω (0.1% Resistors), CF = 1.8pF (See Figure 1) unless otherwise noted. VS is defined as (V+ – V–). VOUTCM is defined as (V+OUT + V–OUT)/2. VICM is defined as (V+IN + V–IN)/2. VOUTDIFF is defined as (V+OUT – V–OUT). CONDITIONS VICM = 3V (Note 12) VICM = 1.25V VICM = 0V (Note 12) VICM = 3V (Note 12) VICM = 1.25V VICM = 0V (Note 12) VICM = 3V VICM = 1.25V VICM = 0V VICM = 3V VICM = 1.25V VICM = 0V Common Mode Differential Mode Differential l l l l l l l MIN TYP ±1 ±0.25 ±1 12 1 7 6 –9 –17 ±1 ±1 ±1 130 3 1 1.6 2.5 9 MAX ±5 ±3.5 ±5 UNITS mV mV mV μV/°C μV/°C μV/°C μA μA μA μA μA μA kΩ kΩ pF nV/√Hz pA/√Hz nV/√Hz Differential Offset Voltage Drift (Input Referred) IB Input Bias Current (Note 6) –24 –1 IOS Input Offset Current (Note 6) l ±3 RIN CIN en in enVOCM VICMR (Note 7) CMRRI (Note 8) CMRRIO (Note 8) PSRR (Note 9) PSRRCM (Note 9) GCM ΔGCM BAL Input Resistance Input Capacitance Differential Input Referred Noise Voltage Density f = 1MHz, Not Including RI/RF Noise Input Noise Current Density f = 1MHz, Not Including RI/RF Noise Input Referred Common Mode Output Noise Voltage Density f = 1MHz Input Signal Common Mode Range Input Common Mode Rejection Ratio (Input Referred) ΔVICM/ΔVOSDIFF Output Common Mode Rejection Ratio (Input Referred) ΔVOCM/ΔVOSDIFF Differential Power Supply Rejection (ΔVS/ΔVOSDIFF) Output Common Mode Power Supply Rejection (ΔVS/ΔVOSCM) Common Mode Gain (ΔVOUTCM/ΔVOCM) Common Mode Gain Error 100 • (GCM – 1) Output Balance (ΔVOUTCM/ΔVOUTDIFF) Op-Amp Inputs VICM from 0V to 3V VOCM from 0.5V to 2V VS = 2.7V to 3.5V VS = 2.7V to 3.5V VOCM from 0.5V to 2V VOCM from 0.5V to 2V ΔVOUTDIFF = 2V Single-Ended Input Differential Input l l l l l l l l l l l l l V– 50 50 55 55 65 70 75 65 1 ±0.4 –57 –65 ±6 15 0.5 12 1.15 2.2 2 2 1.95 1.7 18 1.25 2.35 2.15 2.05 2 1.85 0.23 0.34 0.75 V+ V dB dB dB dB V/V ±0.8 –45 –45 ±15 2 24 1.35 % dB dB mV μV/°C V kΩ V V V V V V V V V 6406fb VOSCM ΔVOSCM/ΔT VOUTCMR (Note 7) RINVOCM VOCM VOUT Common Mode Offset Voltage (VOUTCM – VOCM) Common Mode Offset Voltage Drift Output Signal Common Mode Range (Voltage Range for the VOCM Pin) Input Resistance, VOCM Pin Self-Biased Voltage at the VOCM Pin Output Voltage, High, +OUT/–OUT Pins VOCM = Open VS = 3.3V, IL = 0 VS = 3.3V, IL = –20mA VS = 3V, IL = 0 VS = 3V, IL = –5mA VS = 3V, IL = –20mA VS = 3V, IL = 0 VS = 3V, IL = 5mA VS = 3V, IL = 20mA l l l l l l l l l Output Voltage, Low, +OUT/–OUT Pins 0.33 0.4 0.85 3 LTC6406 DC ELECTRICAL CHARACTERISTICS SYMBOL ISC AVOL VS IS ISHDN RSHDN VIL VIH tON tOFF PARAMETER Output Short-Circuit Current, +OUT/–OUT Pins (Note 10) Large-Signal Open Loop Voltage Gain Supply Voltage Range Supply Current Supply Current in Shutdown SHDN Pull-Up Resistor SHDN Input Logic Low SHDN Input Logic High Turn-On Time Turn-Off Time VSHDN = 0V VSHDN = 0V to 0.5V l l l l l l The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 3V, V– = 0V, VCM = VOCM = VICM = 1.25V, VSHDN = open, RBAL = 100kΩ, RI = 150Ω, RF = 150Ω (0.1% Resistors), CF = 1.8pF (See Figure 1) unless otherwise noted. VS is defined as (V+ – V–). VOUTCM is defined as (V+OUT + V–OUT)/2. VICM is defined as (V+IN + V–IN)/2. VOUTDIFF is defined as (V+OUT – V–OUT). CONDITIONS l MIN ±35 2.7 TYP ±55 90 MAX UNITS mA dB 3.5 18 300 22 500 140 2.55 V mA μA kΩ V V ns ns 60 0.4 100 0.7 2.25 200 50 AC ELECTRICAL CHARACTERISTICS SYMBOL SR GBW f–3dB PARAMETER Slew Rate Gain-Bandwidth Product –3dB Frequency (See Figure 2) 50MHz Distortion Differential Input, VOUTDIFF = 2VP-P (Note 13) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. V+ = 3V, V– = 0V, VCM = VOCM = VICM = 1.25V, VSHDN = open, RI = 150Ω, RF = 150Ω (0.1% Resistors), CF = 1.8pF RLOAD = 400Ω (See Figure 2) unless otherwise noted. VS is defined as (V+ – V–). , VICM is defined as (V+IN + V–IN)/2. VOUTDIFF is defined as (V+OUT – V–OUT). CONDITIONS Differential Output fTEST = 30MHz l MIN TYP 630 3 MAX UNITS V/μS GHz MHz dBc dBc dBc dBc 500 800 –77 –65 –85 –72 VOCM = 1.25V, VS = 3V 2nd Harmonic 3rd Harmonic VOCM = 1.25V, VS = 3V, RLOAD = 800Ω 2nd Harmonic 3rd Harmonic VOCM = 1.25V, VS = 3V, RLOAD = 800Ω, RI = RF = 500Ω 2nd Harmonic 3rd Harmonic l –55 –80 –69 dBc dBc 50MHz Distortion Single-Ended Input, VOUTDIFF = 2VP-P (Note 13) 3rd-Order IMD at 49.5MHz, 50.5MHz OIP3 at 50MHz (Note 11) tS Settling Time VOCM = 1.25V, VS = 3V, RLOAD = 800Ω, RI = RF = 500Ω 2nd Harmonic 3rd Harmonic VOUTDIFF = 2VP-P Envelope, RLOAD = 800Ω RLOAD = 800Ω VOUTDIFF = 2V Step 1% Settling 0.1% Settling Shunt-Terminated to 50Ω, RS = 50Ω ZIN = 200Ω (RI = 100Ω, RF = 300Ω) –69 –73 –65 36.5 7 11 14.1 7.5 dBc dBc dBc dBm ns ns dB dB NF Noise Figure at 50MHz 6406fb 4 LTC6406 ELECTRICAL CHARACTERISTICS Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Input pins (+IN, –IN, VOCM, SHDN and VTIP) are protected by steering diodes to either supply. If the inputs should exceed either supply voltage, the input current should be limited to less than 10mA. In addition, the inputs +IN, –IN are protected by a pair of back-to-back diodes. If the differential input voltage exceeds 1.4V, the input current should be limited to less than 10mA. Note 3: A heat sink may be required to keep the junction temperature below the Absolute Maximum Rating when the output is shorted indefinitely. Long-term application of output currents in excess of the absolute maximum ratings may impair the life of the device. Note 4: The LTC6406C/LTC6406I are guaranteed functional over the operating temperature range –40°C to 85°C. Note 5: The LTC6406C is guaranteed to meet specified performance from 0°C to 70°C. The LTC6406C is designed, characterized, and expected to meet specified performance from –40°C to 85°C but is not tested or QA sampled at these temperatures. The LTC6406I is guaranteed to meet specified performance from –40°C to 85°C. Note 6: Input bias current is defined as the average of the input currents flowing into the inputs (–IN, and +IN). Input offset current is defined as the difference between the input currents (IOS = IB+ – IB–). Note 7: Input common mode range is tested using the test circuit of Figure 1 by taking three measurements of differential gain with a ±1V DC differential output with VICM = 0V; VICM = 1.25V; VICM = 3V, verifying that the differential gain has not deviated from the VICM = 1.25V case by more than 0.5%, and that the common mode offset (VOSCM) has not deviated from the common mode offset at VICM = 1.25V by more than ±20mV. The voltage range for the output common mode range is tested using the test circuit of Figure 1 by applying a voltage on the VOCM pin and testing at both VOCM = 1.25V and at the Electrical Characteristics table limits to verify that the common mode offset (VOSCM) has not deviated by more than ±10mV from the VOCM = 1.25V case. Note 8: Input CMRR is defined as the ratio of the change in the input common mode voltage at the pins +IN or –IN to the change in differential input referred voltage offset. Output CMRR is defined as the ratio of the change in the voltage at the VOCM pin to the change in differential input referred voltage offset. This specification is strongly dependent on feedback ratio matching between the two outputs and their respective inputs, and it is difficult to measure actual amplifier performance (see the “Effects of Resistor Pair Mismatch” in the Applications Information section of this data sheet). For a better indicator of actual amplifier performance independent of feedback component matching, refer to the PSRR specification. Note 9: Differential power supply rejection (PSRR) is defined as the ratio of the change in supply voltage to the change in differential input referred voltage offset. Common mode power supply rejection (PSRRCM) is defined as the ratio of the change in supply voltage to the change in the common mode offset, VOUTCM – VOCM. Note 10: Extended operation with the output shorted may cause the junction temperature to exceed the 150°C limit. Note 11: Because the LTC6406 is a feedback amplifier with low output impedance, a resistive load is not required when driving an ADC. Therefore, typical output power can be very small in many applications. In order to compare the LTC6406 with “RF style” amplifiers that require 50Ω load, the output voltage swing is converted to dBm as if the outputs were driving a 50Ω load. For example, 2VP-P output swing is equal to 10dBm using this convention. Note 12: Includes offset/drift induced by feedback resistors mismatch. See the Applications Information section for more details. Note 13: QFN package only. Refer to data sheet curves for MSOP package numbers. TYPICAL PERFORMANCE CHARACTERISTICS Differential Input Referred Offset Voltage vs Temperature 1.2 1.0 DIFFERENTIAL VOS (mV) 0.8 0.6 0.4 0.2 0 –0.2 –50 DIFFERENTIAL VOS (mV) VS = 3V VOCM = 1.25V VICM = 1.25V RI = RF = 150Ω FIVE TYPICAL UNITS 2.0 1.5 1.0 0.5 0 –0.5 V = 3V –1.0 VS = 1.25V OCM RI = RF = 150Ω –1.5 0.1% FEEDBACK NETWORK RESISTORS TYPICAL UNIT –2.0 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) Differential Input Referred Offset Voltage vs Input Common Mode Voltage COMMON MODE OFFSET VOLTAGE (mV) TA = –40°C TA = 0°C TA = 25°C TA = 70°C TA = 85°C 7 6 5 4 3 2 Common Mode Offset Voltage vs Temperature –25 0 25 50 TEMPERATURE (°C) 75 100 6406 G01 3.0 VS = 3V 1 VOCM = 1.25V VICM = 1.25V FIVE TYPICAL UNITS 0 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 6406 G03 6406 G02 6406fb 5 LTC6406 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 20 TOTAL SUPPLY CURRENT (mA) TA = –40°C TA = 0°C TA = 25°C TA = 70°C TA = 85°C 20 TOTAL SUPPLY CURRENT (mA) Supply Current vs SHDN Voltage SHUTDOWN SUPPLY CURRENT (μA) TA = –40°C TA = 0°C TA = 25°C TA = 70°C TA = 85°C 500 450 400 350 300 250 200 150 100 50 0 Shutdown Supply Current vs Supply Voltage TA = –40°C TA = 0°C TA = 25°C TA = 70°C TA = 85°C 15 15 10 10 5 5 0 0 0.5 VSHDN = OPEN 1.0 1.5 2.0 2.5 SUPPLY VOLTAGE (V) 3.0 3.5 0 0 0.5 1.0 1.5 2.0 SHDN VOLTAGE (V) VS = 3V 2.5 3.0 6406 G05 VSHDN = V– 0 0.5 1.0 1.5 2.0 2.5 SUPPLY VOLTAGE (V) 3.0 3.5 6406 G04 6406 G06 Input Noise Density vs Frequency 100 INPUT VOLTAGE NOISE DENSITY (nV/ Hz) INPUT VOLTAGE NOISE DENSITY (nV/√Hz) VS = 3V VICM = 1.25V 100 INPUT CURRENT NOISE DENSITY (pA/ Hz) 4 Input Noise Density vs Input Common Mode Voltage 4 INPUT CURRENT NOISE DENSITY (pA/√Hz) 650 Differential Slew Rate vs Temperature VS = 3V 3 in 2 en 1 VS = 3V NOISE MEASURED AT f = 1MHz 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) 3 630 SLEW RATE (V/μs) 610 10 10 2 590 in en 1 100 1k 10k 100k FREQUENCY (Hz) 1M 1 10M 6406 G07 1 570 0 0 3.0 550 –50 –25 0 25 50 TEMPERATURE (°C) 75 100 6406 G09 6406 G08 Differential Output Impedance vs Frequency 1000 VS = 3V RI = RF = 150Ω 80 70 60 5O 40 30 0.1 CMRR vs Frequency 80 70 60 PSRR (dB) 5O 40 30 20 10 Differential PSRR vs Frequency OUTPUT IMPEDANCE (Ω) 100 10 1 CMRR (dB) 0.01 1 10 100 FREQUENCY (MHz) 1000 2000 6406 G10 VS = 3V 20 VOCM = 1.25V RI = RF = 150Ω, CF = 1.8pF 0.1% FEEDBACK NETWORK RESISTORS 10 1 10 100 1000 2000 FREQUENCY (MHz) 6406 G11 VS = 3V 1 10 100 FREQUENCY (MHz) 1000 2000 6406 G12 6406fb 6 LTC6406 TYPICAL PERFORMANCE CHARACTERISTICS Small-Signal Step Response +OUT (QFN Package) Large-Signal Step Response 2.5 –OUT 2.0 VOLTAGE (V) Output Overdrive Response –OUT 1.5 1.0 0.5 +OUT 100ns/DIV VS = 3V VOCM = 1.25V RLOAD = 200Ω TO GROUND PER OUTPUT 6406 G15 20mV/DIV 0.2V/DIV –OUT 10ns/DIV VS = 3V VOCM = VICM = 1.25V RLOAD = 400Ω RI = RF = 150Ω, CF = 1.8pF CL = 0pF VIN = 200mVP-P, DIFFERENTIAL 6406 G13 +OUT 10ns/DIV VS = 3V RLOAD = 400Ω VIN = 2VP-P, DIFFERENTIAL 6406 G14 0 Frequency Response vs Closed-Loop Gain 50 40 30 20 GAIN (dB) GAIN (dB) 10 0 –10 –20 –30 AV = 1 AV = 2 AV = 5 AV = 10 AV = 20 AV = 100 1000 2000 CF (pF) 1.8 1.8 0.7 0.3 0.2 0 6406 G16 Frequency Response vs Load Capacitance 30 20 10 0 –10 –20 VS = 3V –30 VOCM = VICM = 1.25V RLOAD = 400Ω –40 RI = RF = 150Ω, CF = 1.8pF CAPACITOR VALUES ARE FROM EACH –50 OUTPUT TO GROUND. NO SERIES RESISTORS ARE USED. –60 1 10 100 1000 2000 FREQUENCY (MHz) 6406 G17 Frequency Response vs Input Common Mode Voltage 10 5 0 –5 GAIN (dB) –10 –15 –20 –25 VS = 3V VOCM = 1.25V –30 RLOAD = 400Ω RI = RF = 150Ω, CF = 1.8pF –35 1 10 100 FREQUENCY (MHz) VICM = 0V VICM = 0.5V VICM = 1.25V VICM = 2V VICM = 3V CL = 0pF CL = 2pF CL = 3pF CL= 4.7pF CL = 10pF VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 400Ω –50 1 10 100 FREQUENCY (MHz) AV (V/V) RI (Ω) 1 2 5 10 20 100 150 150 150 150 150 150 RF (Ω) 150 300 750 1.5k 3k 15k 1000 2000 6406 G18 6406fb 7 LTC6406 TYPICAL PERFORMANCE CHARACTERISTICS Harmonic Distortion vs Frequency –30 VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 800Ω = 2VP-P V –50 OUTDIFF DIFFERENTIAL INPUTS –60 –70 –80 –90 –100 –110 1 10 FREQUENCY (MHz) 100 6406 G19 (QFN Package) Harmonic Distortion vs Input Amplitude –40 VS = 3V VOCM = VICM = 1.25V –50 fIN = 50MHz RLOAD = 800Ω RI = RF = 150Ω –60 DIFFERENTIAL INPUTS –70 3RD –80 –90 –100 –2 –4 (0.4VP-P) Harmonic Distortion vs Input Common Mode Voltage –40 –50 DISTORTION (dBc) –60 –70 –80 VS = 3V –90 VOCM = 1.25V VOUTDIFF = 2VP-P fIN = 50MHz RLOAD = 800Ω DIFFERENTIAL INPUTS –100 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω DISTORTION (dBc) DISTORTION (dBc) 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω 2ND 3.0 0 2 4 6 INPUT AMPLITUDE (dBm) 8 10 (2VP-P) 6406 G21 6406 G20 Harmonic Distortion vs Frequency –30 VS = 3V VOUTDIFF = 2VP-P –40 VOCM = VICM = 1.25V SINGLE-ENDED INPUT RLOAD = 800Ω –50 DISTORTION (dBc) DISTORTION (dBc) –60 –70 –80 –90 –100 –110 1 10 FREQUENCY (MHz) 100 6406 G22 Harmonic Distortion vs Input Common Mode Voltage –40 –50 –60 –70 VS = 3V 3RD –80 VOCM = 1.25V fIN = 50MHz RLOAD = 800Ω –90 RI = RF = 500Ω VOUTDIFF = 2VP-P SINGLE-ENDED INPUT –100 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) 2ND DISTORTION (dBc) –40 Harmonic Distortion vs Input Amplitude VS = 3V VOCM = VICM = 1.25V –50 fIN = 50MHz RLOAD = 800Ω RI = RF = 500Ω –60 SINGLE-ENDED INPUT –70 2ND –80 3RD –90 –100 –4 –2 (0.4VP-P) 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω 3.0 0 2 4 6 INPUT AMPLITUDE (dBm) 8 10 (2VP-P) 6406 G24 6406 G23 Intermodulation Distortion vs Frequency –30 VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 800Ω RI = RF = 150Ω –50 2 TONES, 1MHz TONE SPACING, 2VP-P COMPOSITE –60 DIFFERENTIAL INPUTS –70 –80 –90 –100 –110 1 10 FREQUENCY (MHz) 100 6406 G25 Intermodulation Distortion vs Input Common Mode Voltage –40 –50 THIRD ORDER IMD (dBc) –60 –70 V = 3V S VOCM = 1.25V –80 fIN = 50MHz RLOAD = 800Ω RI = RF = 150Ω –90 2 TONES, 1MHz TONE SPACING, 2VP-P COMPOSITE DIFFERENTIAL INPUTS –100 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) THIRD ORDER IMD (dBc) –40 Intermodulation Distortion vs Input Amplitude VS = 3V VOCM = VICM = 1.25V –50 fIN = 50MHz RLOAD = 800Ω RI = RF = 150Ω –60 2 TONES, 1MHz TONE SPACING DIFFERENTIAL INPUTS –70 –80 –90 –100 –4 –2 (0.4VP-P) THIRD ORDER IMD (dBc) 3.0 0 2 4 6 INPUT AMPLITUDE (dBm) 8 10 (2VP-P) 6406 G27 6406 G26 6406fb 8 LTC6406 TYPICAL PERFORMANCE CHARACTERISTICS Frequency Response vs Closed-Loop Gain 50 40 30 20 GAIN (dB) GAIN (dB) 10 0 –10 –20 –30 AV = 1 AV = 2 AV = 5 AV = 10 AV = 20 AV = 100 1000 2000 30 20 10 0 –10 –20 VS = 3V –30 VOCM = VICM = 1.25V RLOAD = 400Ω –40 RI = RF = 150Ω, CF = 2.2pF CAPACITOR VALUES ARE FROM –50 EACH OUTPUT TO GROUND. NO SERIES RESISTORS ARE USED. –60 1 10 100 FREQUENCY (MHz) (MSOP Package) Frequency Response vs Input Common Mode Voltage 10 5 0 –5 GAIN (dB) –10 –15 –20 –25 VS = 3V VOCM = 1.25V –30 RLOAD = 400Ω RI = RF = 150Ω, CF = 2.2pF –35 1 10 100 FREQUENCY (MHz) VICM = 0V VICM = 0.5V VICM = 1.25V VICM = 2V VICM = 3V Frequency Response vs Load Capacitance CL = 0pF CL = 2pF CL = 3pF CL= 4.7pF CL = 10pF VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 400Ω –50 1 10 100 FREQUENCY (MHz) AV (V/V) RI (Ω) 1 2 5 10 20 100 150 150 150 150 150 150 RF (Ω) 150 300 750 1.5k 3k 15k 1000 2000 6406 G29 1000 2000 6406 G30 CF (pF) 2.2 2.2 0.9 0.4 0.2 0 6406 G28 Harmonic Distortion vs Frequency –30 VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 800Ω –50 VOUTDIFF = 2VP-P DIFFERENTIAL INPUTS –60 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω –70 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω –80 –90 –100 –110 10 10 FREQUENCY (MHz) 100 6406 G31 Harmonic Distortion vs Input Common Mode Voltage –40 –50 DISTORTION (dBc) –60 –70 –80 –90 –100 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) 3.0 6406 G32 Harmonic Distortion vs Input Amplitude –40 VS = 3V VOCM = VICM = 1.25V fIN = 50MHz RLOAD = 800Ω RI = RF = 150Ω DIFFERENTIAL INPUTS 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω DISTORTION (dBc) –50 –60 –70 –80 –90 –100 DISTORTION (dBc) 2ND 3RD VS = 3V VOCM = 1.25V fIN = 50MHz RLOAD = 800Ω VOUTDIFF = 2VP-P DIFFERENTIAL INPUTS –4 –2 (0.4VP-P) 0 2 4 6 INPUT AMPLITUDE (dBm) 8 10 (2VP-P) 6406 G33 6406fb 9 LTC6406 TYPICAL PERFORMANCE CHARACTERISTICS Harmonic Distortion vs Frequency –30 VS = 3V –40 VOCM = VICM = 1.25V RLOAD = 800Ω = 2VP-P V –50 OUTDIFF SINGLE-ENDED INPUT –60 –70 –80 –90 –100 –110 10 2ND, RI = RF = 150Ω 2ND, RI = RF = 500Ω 3RD, RI = RF = 150Ω 3RD, RI = RF = 500Ω 10 FREQUENCY (MHz) 100 6406 G34 (MSOP Package) Harmonic Distortion vs Input Amplitude –40 VS = 3V VOCM = VICM =1.25V –50 fIN = 50MHz RLOAD = 800Ω RI = RF = 500Ω SINGLE-ENDED INPUT –60 –70 –80 –90 –100 Harmonic Distortion vs Input Common Mode Voltage –40 –50 DISTORTION (dBc) –60 2ND –70 –80 –90 –100 0 0.5 1.0 1.5 2.0 2.5 INPUT COMMON MODE VOLTAGE (V) 3.0 6406 G35 DISTORTION (dBc) 2ND DISTORTION (dBc) VS = 3V VOCM = 1.25V fIN = 50MHz RLOAD = 800Ω RI = RF = 500Ω VOUTDIFF = 2VP-P SINGLE-ENDED INPUT 3RD 3RD –4 –2 (0.4VP-P) 0 2 4 6 INPUT AMPLITUDE (dBm) 8 10 (2VP-P) 6406 G36 PIN FUNCTIONS (QFN/MSOP) SHDN (Pin 1/Pin 7): When SHDN is floating or directly tied to V+, the LTC6406 is in the normal (active) operating mode. When the SHDN pin is connected to V–, the LTC6406 enters into a low power shutdown state with Hi-Z outputs. V+, V– (Pins 2, 10, 11 and Pins 3, 9, 12/Pins 3, 6): Power Supply Pins. It is critical that close attention be paid to supply bypassing. For single supply applications it is recommended that a high quality 0.1μF surface mount ceramic bypass capacitor be placed between V+ and V– with direct short connections. In addition, V– should be tied directly to a low impedance ground plane with minimal routing. For dual (split) power supplies, it is recommended that additional high quality, 0.1μF ceramic capacitors are used to bypass V+ to ground and V– to ground, again with minimal routing. For driving large loads (