Datasheet LTC6421-20 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Dual Matched 1.3GHz Differential Amplifiers/ADC Drivers |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTION. Matched Gain ±0.1dB. Matched Phase ±0.2° at … |
| File Format / Size | PDF / 251 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. Matched Gain ±0.1dB. Matched Phase ±0.2° at 100MHz. Channel Separation 80dB at 100MHz. APPLICATIONS
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Text Version of Document
LTC6421-20 Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers
FEATURES DESCRIPTION
n
Matched Gain ±0.1dB
The LTC®6421-20 is a dual high speed differential amplifi er n
Matched Phase ±0.2° at 100MHz
targeted at processing signals from DC to 140MHz. The n
Channel Separation 80dB at 100MHz
part has been specifi cally designed to drive 12-, 14- and n 1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB) 16-bit ADCs with low noise and low distortion, but can also n IMD3 = –76dBc at 100MHz, 2VP-P be used as a general-purpose broadband gain block. n Equivalent OIP3 = 42dBm at 100MHz The LTC6421-20 is easy to use, with minimal support n 1nV/√Hz Internal Op Amp Noise circuitry required. The output common mode voltage n 6.2dB Noise Figure is set using an external pin, independent of the inputs, n Differential Inputs and Outputs which eliminates the need for transformers or AC-coupling n Rail-to-Rail Output Swing capacitors in many applications. The gain is internally n 40mA Supply Current (120mW) per Amplifi er fi xed at 20dB (10V/ V). n 1V to 1.6V Output Common Mode Voltage, Adjustable The LTC6421-20 saves space and power compared to n DC- or AC-Coupled Operation alternative solutions using IF gain blocks and transformers. n 20-Lead 3mm × 4mm × 0.75mm QFN Package The LTC6421-20 is packaged in a compact 20-lead 3mm × 4mm QFN package and operates over the – 40°C
APPLICATIONS
to 85°C temperature range. n Differential ADC Driver L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Single Ended to Differential Conversion Technology Corporation. All other trademarks are the property of their respective owners. n IF Sampling (Diversity) Receivers n Broadband I/Q Amplifi ers n Satellite Communications
TYPICAL APPLICATION Matched Dual Amplifi ers with Output Common Mode Biasing
3V 1000pF 0.1μF VOCMA
Distribution of Gain Match
V + A VOCMA ENABLEA ZIN = 200Ω LTC6421-20 40 0.1μF 1000Ω –INA 100Ω 12.5Ω +OUTA 35 VOCMA 30 VINA 0.1μF +INA 100Ω 12.5Ω –OUTA 25 VOCMA 1000Ω 20 V – V – ±0.1dB GAIN MATCHING AGE OF UNITS ±0.1° PHASE MATCHING 15 AT 100MHz 0.1μF 1000Ω PERCENT 10 +INB 100Ω 12.5Ω –OUTB VOCMB 5 VINB 0.1μF – INB 100Ω 12.5Ω +OUTB 0 VOCMB – 0.25 – 0.15 – 0.05 0.05 0.15 0.25 CHANNEL-TO-CHANNEL GAIN MATCH (dB) 1000Ω ZIN = 200Ω 642120 TA01b V+ B V ENABLEB OCMB 642120 TA01a 1000pF 0.1μF VOCMB 3V 642120fb 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION SELECTOR GUIDE DC ELECTRICAL CHARACTERISTICS AC ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
FEATURES DESCRIPTION
n
Matched Gain ±0.1dB
The LTC®6421-20 is a dual high speed differential amplifi er n
Matched Phase ±0.2° at 100MHz
targeted at processing signals from DC to 140MHz. The n
Channel Separation 80dB at 100MHz
part has been specifi cally designed to drive 12-, 14- and n 1.3GHz –3dB Bandwidth; Fixed Gain of 10V/V (20dB) 16-bit ADCs with low noise and low distortion, but can also n IMD3 = –76dBc at 100MHz, 2VP-P be used as a general-purpose broadband gain block. n Equivalent OIP3 = 42dBm at 100MHz The LTC6421-20 is easy to use, with minimal support n 1nV/√Hz Internal Op Amp Noise circuitry required. The output common mode voltage n 6.2dB Noise Figure is set using an external pin, independent of the inputs, n Differential Inputs and Outputs which eliminates the need for transformers or AC-coupling n Rail-to-Rail Output Swing capacitors in many applications. The gain is internally n 40mA Supply Current (120mW) per Amplifi er fi xed at 20dB (10V/ V). n 1V to 1.6V Output Common Mode Voltage, Adjustable The LTC6421-20 saves space and power compared to n DC- or AC-Coupled Operation alternative solutions using IF gain blocks and transformers. n 20-Lead 3mm × 4mm × 0.75mm QFN Package The LTC6421-20 is packaged in a compact 20-lead 3mm × 4mm QFN package and operates over the – 40°C
APPLICATIONS
to 85°C temperature range. n Differential ADC Driver L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear n Single Ended to Differential Conversion Technology Corporation. All other trademarks are the property of their respective owners. n IF Sampling (Diversity) Receivers n Broadband I/Q Amplifi ers n Satellite Communications
TYPICAL APPLICATION Matched Dual Amplifi ers with Output Common Mode Biasing
3V 1000pF 0.1μF VOCMA
Distribution of Gain Match
V + A VOCMA ENABLEA ZIN = 200Ω LTC6421-20 40 0.1μF 1000Ω –INA 100Ω 12.5Ω +OUTA 35 VOCMA 30 VINA 0.1μF +INA 100Ω 12.5Ω –OUTA 25 VOCMA 1000Ω 20 V – V – ±0.1dB GAIN MATCHING AGE OF UNITS ±0.1° PHASE MATCHING 15 AT 100MHz 0.1μF 1000Ω PERCENT 10 +INB 100Ω 12.5Ω –OUTB VOCMB 5 VINB 0.1μF – INB 100Ω 12.5Ω +OUTB 0 VOCMB – 0.25 – 0.15 – 0.05 0.05 0.15 0.25 CHANNEL-TO-CHANNEL GAIN MATCH (dB) 1000Ω ZIN = 200Ω 642120 TA01b V+ B V ENABLEB OCMB 642120 TA01a 1000pF 0.1μF VOCMB 3V 642120fb 1 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION SELECTOR GUIDE DC ELECTRICAL CHARACTERISTICS AC ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS
