Datasheet LT6600-20 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | Very Low Noise, Differential Amplifier and 20MHz Lowpass Filter |
| Seiten / Seite | 12 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. An 8192 Point … |
| Dateiformat / Größe | PDF / 179 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. An 8192 Point FFT Spectrum
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LT6600-20 Very Low Noise, Differential Amplifi er and 20MHz Lowpass Filter
FEATURES DESCRIPTION
n Programmable Differential Gain via Two External The LT®6600-20 combines a fully differential amplifi er with a Resistors 4th order 20MHz lowpass fi lter approximating a Chebyshev n Adjustable Output Common Mode Voltage frequency response. Most differential amplifi ers require n Operates and Specifi ed with 3V, 5V, ±5V Supplies many precision external components to tailor gain and n 0.5dB Ripple 4th Order Lowpass Filter with 20MHz bandwidth. In contrast, with the LT6600-20, two external Cutoff resistors program differential gain, and the fi lter’s 20MHz n 76dB S/N with 3V Supply and 2VP-P Output cutoff frequency and passband ripple are internally set. n Low Distortion, 2VP-P, 800Ω Load The LT6600-20 also provides the necessary level shifting 2.5MHz: 83dBc 2nd, 88dBc 3rd to set its output common mode voltage to accommodate 20MHz: 63dBc 2nd, 64dBc 3rd the reference voltage requirements of A/Ds. n Fully Differential Inputs and Outputs Using a proprietary internal architecture, the LT6600-20 n SO-8 Package integrates an antialiasing fi lter and a differential ampli- n Compatible with Popular Differential Amplifi er fi er/driver without compromising distortion or low noise Pinouts performance. At unity gain the measured in band signal- to-noise ratio is an impressive 76dB. At higher gains the
APPLICATIONS
input referred noise decreases so the part can process smaller input differential signals without signifi cantly n High Speed ADC Antialiasing and DAC Smoothing in degrading the output signal-to-noise ratio. Networking or Cellular Base Station Applications n High Speed Test and Measurement Equipment The LT6600-20 also features low voltage operation. The n Medical Imaging differential design provides outstanding performance for n Drop-in Replacement for Differential Amplifi ers a 2VP-P signal level while the part operates with a single 3V supply. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LT6600-20 is packaged in an SO-8 and is pin compat- ible with stand alone differential amplifi ers.
TYPICAL APPLICATION An 8192 Point FFT Spectrum
0 INPUT 5.9MHz –10 LT6600-20 A/D 2VP-P –20 f 5V LTC1748 SAMPLE = 80MHz 0.1μF –30 5V –40 RIN 402Ω 3 –50 1 49.9Ω – V+ 4 –60 7 + + VMID –70 18pF A 2 IN DOUT AMPLITUDE (dB) 0.01μF 49.9Ω V –80 OCM 8 – – V 5 –90 IN + V R CM V– IN 6 –100 402Ω –110 1μF –120 GAIN = 402Ω/RIN 0 10 20 30 40 66002 TA01a FREQUENCY (MHz) 66002 TA01b 66002fb 1
FEATURES DESCRIPTION
n Programmable Differential Gain via Two External The LT®6600-20 combines a fully differential amplifi er with a Resistors 4th order 20MHz lowpass fi lter approximating a Chebyshev n Adjustable Output Common Mode Voltage frequency response. Most differential amplifi ers require n Operates and Specifi ed with 3V, 5V, ±5V Supplies many precision external components to tailor gain and n 0.5dB Ripple 4th Order Lowpass Filter with 20MHz bandwidth. In contrast, with the LT6600-20, two external Cutoff resistors program differential gain, and the fi lter’s 20MHz n 76dB S/N with 3V Supply and 2VP-P Output cutoff frequency and passband ripple are internally set. n Low Distortion, 2VP-P, 800Ω Load The LT6600-20 also provides the necessary level shifting 2.5MHz: 83dBc 2nd, 88dBc 3rd to set its output common mode voltage to accommodate 20MHz: 63dBc 2nd, 64dBc 3rd the reference voltage requirements of A/Ds. n Fully Differential Inputs and Outputs Using a proprietary internal architecture, the LT6600-20 n SO-8 Package integrates an antialiasing fi lter and a differential ampli- n Compatible with Popular Differential Amplifi er fi er/driver without compromising distortion or low noise Pinouts performance. At unity gain the measured in band signal- to-noise ratio is an impressive 76dB. At higher gains the
APPLICATIONS
input referred noise decreases so the part can process smaller input differential signals without signifi cantly n High Speed ADC Antialiasing and DAC Smoothing in degrading the output signal-to-noise ratio. Networking or Cellular Base Station Applications n High Speed Test and Measurement Equipment The LT6600-20 also features low voltage operation. The n Medical Imaging differential design provides outstanding performance for n Drop-in Replacement for Differential Amplifi ers a 2VP-P signal level while the part operates with a single 3V supply. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LT6600-20 is packaged in an SO-8 and is pin compat- ible with stand alone differential amplifi ers.
TYPICAL APPLICATION An 8192 Point FFT Spectrum
0 INPUT 5.9MHz –10 LT6600-20 A/D 2VP-P –20 f 5V LTC1748 SAMPLE = 80MHz 0.1μF –30 5V –40 RIN 402Ω 3 –50 1 49.9Ω – V+ 4 –60 7 + + VMID –70 18pF A 2 IN DOUT AMPLITUDE (dB) 0.01μF 49.9Ω V –80 OCM 8 – – V 5 –90 IN + V R CM V– IN 6 –100 402Ω –110 1μF –120 GAIN = 402Ω/RIN 0 10 20 30 40 66002 TA01a FREQUENCY (MHz) 66002 TA01b 66002fb 1