Datasheet LTC6401-8 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Equivalent … |
| File Format / Size | PDF / 231 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Equivalent Output IP3 vs Frequency
Model Line for this Datasheet
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LTC6401-8 2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz
FEATURES DESCRIPTION
■ 2.2GHz –3dB Bandwidth The LTC®6401-8 is a high-speed differential amplifi er tar- ■ Fixed Gain of 2.5V/V (8dB) geted at processing signals from DC to 140MHz. The part ■ –92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm) has been specifi cally designed to drive 12-, 14- and 16-bit ■ –80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm) ADCs with low noise and low distortion, but can also be ■ 1nV/√⎯H⎯z Internal Op Amp Noise used as a general-purpose broadband gain block. ■ 12.1dB Noise Figure The LTC6401-8 is easy to use, with minimal support cir- ■ Differential Inputs and Outputs cuitry required. The output common mode voltage is set ■ 400Ω Input Impedance using an external pin, independent of the inputs, which ■ 2.85V to 3.5V Supply Voltage eliminates the need for transformers or AC-coupling ca- ■ 45mA Supply Current (135mW) pacitors in many applications. The gain is internally fi xed ■ 1V to 1.6V Output Common Mode, Adjustable at 8dB (2.5V/V). ■ DC- or AC-Coupled Operation ■ Max Differential Output Swing 4.6V The LTC6401-8 saves space and power compared to al- P-P ■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package ternative solutions using IF gain blocks and transformers. The LTC6401-8 is packaged in a compact 16-lead 3mm ×
APPLICATIONS
3mm QFN package and operates over the –40°C to 85°C temperature range. ■ Differential ADC Driver , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing
TYPICAL APPLICATION
3.3V 3.3V
Equivalent Output IP3 vs Frequency
60 (NOTE 7) C2 C1 CF2 0.1μF 1000pF 33pF 50 C3 V+ RS1 RS3 0.1μF 15Ω 10Ω 40 VDD V AIN+ IN +IN +OUT R1 30 L1 C 59.0Ω C4 LTC6401-8 F1 LTC2208 0.1μF RS2 24nH 33pF RS4 15Ω 10Ω –IN 20 –OUT AIN– OUTPUT IP3 (dBm) V VCM R2 OCM CF3 27.4Ω COILCRAFT V– 33pF LTC2208 10 0603CS 130Msps 1.25V 16-Bit ADC 64018 TA01a 0 C5 R3 0 20 40 60 80 100 120 140 160 180 200 0.1μF 100Ω FREQUENCY (MHz) 64018 TA01b 64018f 1
FEATURES DESCRIPTION
■ 2.2GHz –3dB Bandwidth The LTC®6401-8 is a high-speed differential amplifi er tar- ■ Fixed Gain of 2.5V/V (8dB) geted at processing signals from DC to 140MHz. The part ■ –92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm) has been specifi cally designed to drive 12-, 14- and 16-bit ■ –80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm) ADCs with low noise and low distortion, but can also be ■ 1nV/√⎯H⎯z Internal Op Amp Noise used as a general-purpose broadband gain block. ■ 12.1dB Noise Figure The LTC6401-8 is easy to use, with minimal support cir- ■ Differential Inputs and Outputs cuitry required. The output common mode voltage is set ■ 400Ω Input Impedance using an external pin, independent of the inputs, which ■ 2.85V to 3.5V Supply Voltage eliminates the need for transformers or AC-coupling ca- ■ 45mA Supply Current (135mW) pacitors in many applications. The gain is internally fi xed ■ 1V to 1.6V Output Common Mode, Adjustable at 8dB (2.5V/V). ■ DC- or AC-Coupled Operation ■ Max Differential Output Swing 4.6V The LTC6401-8 saves space and power compared to al- P-P ■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package ternative solutions using IF gain blocks and transformers. The LTC6401-8 is packaged in a compact 16-lead 3mm ×
APPLICATIONS
3mm QFN package and operates over the –40°C to 85°C temperature range. ■ Differential ADC Driver , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing
TYPICAL APPLICATION
3.3V 3.3V
Equivalent Output IP3 vs Frequency
60 (NOTE 7) C2 C1 CF2 0.1μF 1000pF 33pF 50 C3 V+ RS1 RS3 0.1μF 15Ω 10Ω 40 VDD V AIN+ IN +IN +OUT R1 30 L1 C 59.0Ω C4 LTC6401-8 F1 LTC2208 0.1μF RS2 24nH 33pF RS4 15Ω 10Ω –IN 20 –OUT AIN– OUTPUT IP3 (dBm) V VCM R2 OCM CF3 27.4Ω COILCRAFT V– 33pF LTC2208 10 0603CS 130Msps 1.25V 16-Bit ADC 64018 TA01a 0 C5 R3 0 20 40 60 80 100 120 140 160 180 200 0.1μF 100Ω FREQUENCY (MHz) 64018 TA01b 64018f 1
