Datasheet LT1567 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 1.4nV/√Hz 180MHz Filter Building Block |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTIO. Single-Ended to Differential Conversion. Low Noise: … |
| Formato / tamaño de archivo | PDF / 208 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTIO. Single-Ended to Differential Conversion. Low Noise: 1.4nV/. RMS Total Wideband Noise in Filter. with 2MHz f
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LT1567 1.4nV/√Hz 180MHz Filter Building Block
U FEATURES DESCRIPTIO
■
Single-Ended to Differential Conversion
The LT®1567 is an analog building block optimized for ■
Low Noise: 1.4nV/
√
Hz
very low noise high frequency filter applications. It con- ■
20
µ
V
tains two wideband rail-to-rail operational amplifiers, one
RMS Total Wideband Noise in Filter with 2MHz f
of them internally configured as a unity-gain inverter.
C
■ Dynamic Range: 104dB SNR at ±5V With the addition of a few passive components, the ■ Total Supply Voltage: 2.7V to 12V LT1567 becomes a flexible second order filter section ■ Rail-to-Rail Outputs with cutoff frequency (fC) up to 5MHz, ideal for antialias- ■ DC Accurate: Op Amp V ing or for channel filtering in high speed data communi- OS 0.5mV (Typ) ■ Trimmed Bandwidth for Accurate Filters cations systems. A spreadsheet-based design tool is ■ No External Clock Required available at www.linear.com for designing lowpass and ■ MSOP-8 Surface Mount Package bandpass filters using the LT1567.
U
In addition to low noise and high speed, the LT1567
APPLICATIO S
features single-ended to differential conversion for direct driving of high speed differential input A/D converters. The ■ Low Noise, High Speed Filters to 5MHz LT1567 operates from a total power supply voltage of 2.7V ■ Low Noise Differential Circuits to 12V and supports signal-to-noise ratios above 100dB. ■ Communication Channel or Roofing Filters ■ Antialias or Reconstruction Filtering The LT1567 is available in an 8-lead MSOP package. ■ Video Signal Processing , LTC, LT and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Single-Ended to Differential Conversion
U TYPICAL APPLICATIO 2MHz 3-Pole Antialias Filter with Single-Ended to Differential Conversion Frequency Response
V+ 12 R2 0.1µF 536Ω 6 C2 R1 R3 270pF 0 536Ω 147Ω 1 8 R4 VIN 147Ω –6 +A 2 7 IN –12 C1 0.1µF C3 LT1567 ADC 270pF 3 6 270pF GAIN (dB) –18 –AIN 4 5 R5 –24 LTC1420 147Ω NOTE: 6dB GAIN RESULTS FROM 0.1µF –30 SINGLE-ENDED TO DIFFERENTIAL 1567 TA01 CONVERSION V– –36 100 1M 10M 96dB DIFFERENTIAL SNR WITH 3V TOTAL SUPPLY FREQUENCY (Hz) R2 GAIN = ≤ 2.5MHz R1 f 1567 TA01a –3dB R3 = R4 = R5, C1 = C2 = C3 1.82 f 1 –3dB = = ; f 2πR2C2 –3dB ≤ 2.5MHz 4πR3C3 1567fa 1
U FEATURES DESCRIPTIO
■
Single-Ended to Differential Conversion
The LT®1567 is an analog building block optimized for ■
Low Noise: 1.4nV/
√
Hz
very low noise high frequency filter applications. It con- ■
20
µ
V
tains two wideband rail-to-rail operational amplifiers, one
RMS Total Wideband Noise in Filter with 2MHz f
of them internally configured as a unity-gain inverter.
C
■ Dynamic Range: 104dB SNR at ±5V With the addition of a few passive components, the ■ Total Supply Voltage: 2.7V to 12V LT1567 becomes a flexible second order filter section ■ Rail-to-Rail Outputs with cutoff frequency (fC) up to 5MHz, ideal for antialias- ■ DC Accurate: Op Amp V ing or for channel filtering in high speed data communi- OS 0.5mV (Typ) ■ Trimmed Bandwidth for Accurate Filters cations systems. A spreadsheet-based design tool is ■ No External Clock Required available at www.linear.com for designing lowpass and ■ MSOP-8 Surface Mount Package bandpass filters using the LT1567.
U
In addition to low noise and high speed, the LT1567
APPLICATIO S
features single-ended to differential conversion for direct driving of high speed differential input A/D converters. The ■ Low Noise, High Speed Filters to 5MHz LT1567 operates from a total power supply voltage of 2.7V ■ Low Noise Differential Circuits to 12V and supports signal-to-noise ratios above 100dB. ■ Communication Channel or Roofing Filters ■ Antialias or Reconstruction Filtering The LT1567 is available in an 8-lead MSOP package. ■ Video Signal Processing , LTC, LT and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Single-Ended to Differential Conversion
U TYPICAL APPLICATIO 2MHz 3-Pole Antialias Filter with Single-Ended to Differential Conversion Frequency Response
V+ 12 R2 0.1µF 536Ω 6 C2 R1 R3 270pF 0 536Ω 147Ω 1 8 R4 VIN 147Ω –6 +A 2 7 IN –12 C1 0.1µF C3 LT1567 ADC 270pF 3 6 270pF GAIN (dB) –18 –AIN 4 5 R5 –24 LTC1420 147Ω NOTE: 6dB GAIN RESULTS FROM 0.1µF –30 SINGLE-ENDED TO DIFFERENTIAL 1567 TA01 CONVERSION V– –36 100 1M 10M 96dB DIFFERENTIAL SNR WITH 3V TOTAL SUPPLY FREQUENCY (Hz) R2 GAIN = ≤ 2.5MHz R1 f 1567 TA01a –3dB R3 = R4 = R5, C1 = C2 = C3 1.82 f 1 –3dB = = ; f 2πR2C2 –3dB ≤ 2.5MHz 4πR3C3 1567fa 1