Datasheet LTC6261, LTC6262, LTC6263 (Analog Devices) - 15

LTC6261/LTC6262/LTC6263
typicAl ApplicAtions
R2 The frequency response shows an expected roll-off of two 15.4k poles along with a gentle droop near the 3dB point; the C2 transient response is very clean. 47pF
Third Order Butterworth Filter
3.3V R1 R3 Maximally flat magnitude response in the pass-band arises 15.4k 15.4k – U1 IN from use of a Butterworth filter. A third R-C stage is added OUT C1 LTC6261 in front of the filter in order to maximize the roll-off for a 150pF + single amplifier circuit. V 626123 TA05 REF R7 15.4k Supply current consumption is around 230µA. The values C5 47pF of resistors chosen minimize consumption at the expense of noise. 3.3V R4 R5 R6 7.7k 7.7k 5.54k –
LTC6261 Second Order Butterworth
U1 IN
Frequency Response
OUT C3 C4 LTC6261 470pF 470pF + 10.0 0 V 626123 TA08 REF –10.0 Supply current consumption is around 235µA. The values –20.0 of resistors chosen minimize consumption at the expense –30.0 of noise. GAIN (dB) –40.0 –50.0
LTC6261 Third Order Butterworth Frequency Response
–60.0 10.0 –70.00.001 0.01 0.1 1 4 0 FREQUENCY (MHz) 626123 TA06 –10.0
Bessel Filter Response
–20.0 4.0 –30.0 1VP-P GAIN (dB) –40.0 3.5 –50.0 3.0 –60.0 TAGE (V) 2.5 –70.00.001 0.01 0.1 1 2 FREQUENCY (MHz) 2.0 626123 TA09 OUTPUT VOL 1.5 1.0 10µs/Div 626123 TA07 626123fa For more information www.linear.com/LTC6261 15 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information 5V Electrical Characteristics 1.8V Electrical Characteristics Typical Performance Characteristics Pin Functions Simplified Schematic Operation Applications Information Package Description Typical Application Related Parts