Datasheet LTC6268, LTC6269 (Analog Devices) - 24
| 制造商 | Analog Devices |
| 描述 | Dual 500MHz Ultra-Low Bias Current FET Input Op Amp |
| 页数 / 页 | 24 / 24 — TYPICAL APPLICATION. LTC6268 as a High-Z Buffer Driving an LT1395 as a |
| 文件格式/大小 | PDF / 503 Kb |
| 文件语言 | 英语 |
TYPICAL APPLICATION. LTC6268 as a High-Z Buffer Driving an LT1395 as a
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LTC6268/LTC6269
TYPICAL APPLICATION LTC6268 as a High-Z Buffer Driving an LT1395 as a Single-Ended to Differential Converter Into a 16-Bit ADC
R9 1.8V 1.8V 200Ω VDD OVDD L1 L2 R10 R16 +V LTC2269 R6 100nH 100nH 75Ω 49.9Ω A + IN+ R2 R1 U1 – 100Ω 75Ω 49.9Ω 16-BIT V C2 R4 IN + –LTC6268 S/H ADC CORE 10pF 49.9Ω D15 R3 C1 • • • A 22pF R5 IN– 10M OUTPUT VIN = 2.048V 49.9Ω DRIVERS ±1.7V FS D0 C3 L3 L4 R11 R17 10pF 10MHz CLOCK LTC6655-2.048 R7 100nH 100nH 75Ω 49.9Ω CLOCK CONTROL V 100Ω V REF +V IN VOUT_F CIN SHDN VOUT_s R12 R13 R14 R15 0.1µF C4 C4 GND R8 825Ω 825Ω 402Ω 402Ω 0.1µF 100µF V 200Ω CM GND OGND +V R18 + – U2 LTC2269 16-BIT 20 Msps ADC 49.9Ω +V = 5V + C5 – LT1395 –V = –5V .01µF –V 6268 TA03
Reconstructed Sampled Time Domain Response of Above Circuit
64k fS = 10Msps 60k fIN = 10.101MHz 56k 52k 48k 44k 40k 36k 32k 28k 24k 20k ADC OUTPUTS (COUNTS) 16k 12k 8k 4k0 440 460 480 500 520 540 560 580 TIME (10ns/DIV) 6268 F11
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS Op Amps
LTC6244 Dual 50MHz, Low Noise, Rail-to-Rail, CMOS Op Amp Unity Gain Stable, 1pA Input Bias Current, 100μV Max Offset. LTC6240/LTC6241/ 18MHz, Low Noise, Rail-to-Rail Output, CMOS Op Amp 18MHz GBW, 0.2pA Input Current, 125μV Max Offset. LTC6242 LTC6252/LTC6253/ 720MHz, 3.5mA Power Efficient Rail-to-Rail I/O Op Amp 720MHz GBW, Unity Gain Stable, Low Noise LTC6254 LTC6246/LTC6247/ 180MHz, 1mA Power Efficient Rail-to-Rail I/O Op Amps 180MHz GBW, Unity Gain Stable, Low Noise LTC6248 LT1818 400MHz, 2500V/µs, 9mA Single Operational Amplifier Unity Gain Stable, 6nV/√Hz Unity Gain Stable LT6230 215MHz, Rail-to-Rail Output, 1.1nV/√Hz, 3.5mA Op Amp Family 350μV Max Offset Voltage, 3V to 12.6V Supply LT6411 650MHz Differential ADC Driver/Dual Selectable Amplifier SR 3300V/µs, 6ns 0.1% Settling.
SAR ADC
LTC2376-18/ 18-Bit, 250ksps to 1.6Msps, Low Power SAR ADC, 102dB SNR 18mW at 1.6Msps, 3.4μW at 250sps, –126dB THD. LTC2377-18/ LTC2378-18/ LTC2379-18 62689f 24 LT 0914 • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95Fo 0 r3 m 5- o7re 4 in 17formation www.linear.com/LTC6268 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC6268 LINEAR TECHNOLOGY CORPORATION 2014
TYPICAL APPLICATION LTC6268 as a High-Z Buffer Driving an LT1395 as a Single-Ended to Differential Converter Into a 16-Bit ADC
R9 1.8V 1.8V 200Ω VDD OVDD L1 L2 R10 R16 +V LTC2269 R6 100nH 100nH 75Ω 49.9Ω A + IN+ R2 R1 U1 – 100Ω 75Ω 49.9Ω 16-BIT V C2 R4 IN + –LTC6268 S/H ADC CORE 10pF 49.9Ω D15 R3 C1 • • • A 22pF R5 IN– 10M OUTPUT VIN = 2.048V 49.9Ω DRIVERS ±1.7V FS D0 C3 L3 L4 R11 R17 10pF 10MHz CLOCK LTC6655-2.048 R7 100nH 100nH 75Ω 49.9Ω CLOCK CONTROL V 100Ω V REF +V IN VOUT_F CIN SHDN VOUT_s R12 R13 R14 R15 0.1µF C4 C4 GND R8 825Ω 825Ω 402Ω 402Ω 0.1µF 100µF V 200Ω CM GND OGND +V R18 + – U2 LTC2269 16-BIT 20 Msps ADC 49.9Ω +V = 5V + C5 – LT1395 –V = –5V .01µF –V 6268 TA03
Reconstructed Sampled Time Domain Response of Above Circuit
64k fS = 10Msps 60k fIN = 10.101MHz 56k 52k 48k 44k 40k 36k 32k 28k 24k 20k ADC OUTPUTS (COUNTS) 16k 12k 8k 4k0 440 460 480 500 520 540 560 580 TIME (10ns/DIV) 6268 F11
RELATED PARTS PART NUMBER DESCRIPTION COMMENTS Op Amps
LTC6244 Dual 50MHz, Low Noise, Rail-to-Rail, CMOS Op Amp Unity Gain Stable, 1pA Input Bias Current, 100μV Max Offset. LTC6240/LTC6241/ 18MHz, Low Noise, Rail-to-Rail Output, CMOS Op Amp 18MHz GBW, 0.2pA Input Current, 125μV Max Offset. LTC6242 LTC6252/LTC6253/ 720MHz, 3.5mA Power Efficient Rail-to-Rail I/O Op Amp 720MHz GBW, Unity Gain Stable, Low Noise LTC6254 LTC6246/LTC6247/ 180MHz, 1mA Power Efficient Rail-to-Rail I/O Op Amps 180MHz GBW, Unity Gain Stable, Low Noise LTC6248 LT1818 400MHz, 2500V/µs, 9mA Single Operational Amplifier Unity Gain Stable, 6nV/√Hz Unity Gain Stable LT6230 215MHz, Rail-to-Rail Output, 1.1nV/√Hz, 3.5mA Op Amp Family 350μV Max Offset Voltage, 3V to 12.6V Supply LT6411 650MHz Differential ADC Driver/Dual Selectable Amplifier SR 3300V/µs, 6ns 0.1% Settling.
SAR ADC
LTC2376-18/ 18-Bit, 250ksps to 1.6Msps, Low Power SAR ADC, 102dB SNR 18mW at 1.6Msps, 3.4μW at 250sps, –126dB THD. LTC2377-18/ LTC2378-18/ LTC2379-18 62689f 24 LT 0914 • PRINTED IN USA Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95Fo 0 r3 m 5- o7re 4 in 17formation www.linear.com/LTC6268 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com/LTC6268 LINEAR TECHNOLOGY CORPORATION 2014