LTC1563-2CGN#PBF Linear Technology, LTC1563-2CGN#PBF Datasheet
LTC1563-2CGN#PBF
Specifications of LTC1563-2CGN#PBF
Available stocks
Related parts for LTC1563-2CGN#PBF
LTC1563-2CGN#PBF Summary of contents
Page 1
... RC lowpass filters with rail-to-rail C inputs and outputs and low DC offset suitable for systems with a resolution bits. The LTC1563-2, with a single resistor value, gives a unity-gain Butterworth response. The LTC1563-3, with a single resistor value, gives a unity-gain Bessel response. The proprietary ...
Page 2
... V – Any Pin ....................... (V Power Dissipation .............................................. 500mW Operating Temperature Range LTC1563C ............................................... 0°C to 70°C LTC1563I ............................................ – 40°C to 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating temperature range, otherwise specifications are 25°C. ...
Page 3
... Power Supply Current, HS Mode Power Supply Current, LP Mode Shutdown Mode Supply Current EN Input Logic Low Level EN Input Logic High Level LP Logic Low Level LP Logic High Level LTC1563-2 Transfer Function Characteristics Cutoff Frequency Range Mode (Note 2) Cutoff Frequency Range Mode (Note 2) Cutoff Frequency Accuracy, HS Mode ...
Page 4
... Note 2: The minimum cutoff frequency of the LTC1563 is arbitrarily listed as 256Hz. The limit is arrived at by setting the maximum resistor value limit at 10MΩ. The LTC1563 can be used with even larger valued resistors. When using very large values of resistance careful layout and thorough ...
Page 5
... SUPPLY –70 – 25.6kHz C –90 HIGH SPEED MODE f = 5kHz IN –100 0 INPUT VOLTAGE (V ) P-P 1563 G08 LTC1563-2/LTC1563-3 Output Voltage Swing High vs Load Resistance 5.5 = ± 5.0 4.5 HS MODE 4.0 LP MODE 3.5 3.0 2.5 100 1k 10k LOAD RESISTANCE—LOAD TO GROUND (Ω) 1563 G03 ...
Page 6
... LTC1563-2/LTC1563 TYPICAL PERFOR A CE CHARACTERISTICS THD + Noise vs Input Frequency – SINGLE 3.3V S LOW POWER MODE f = 25.6kHz C –70 1V P-P –80 2V P-P –90 –100 INPUT FREQUENCY (kHz) 1563 G10 THD + Noise vs Input Frequency – SINGLE 5V S LOW POWER MODE f = 25.6kHz C –70 1V P-P –80 ...
Page 7
... LP MODE MODE 0 100 f (Hz) C Stopband Gain vs Input Frequency 256kHz 0 C –10 –20 –30 LTC1563-2 LTC1563-3 –40 –50 –60 –70 –80 –90 10k 100k 1M 10M FREQUENCY (Hz) Crosstalk Rejection vs Frequency DUAL SECOND ORDER BUTTERWORTH f = 256kHz C HIGH SPEED MODE 1k 10k 100k 1M FREQUENCY (Hz) 1563 G26 ...
Page 8
... The LTC1563 the High Speed mode when the LP input logic high level or is open-circuited. A small pull-up current source at the LP input defaults the LTC1563-X to the High Speed mode if the pin is left open. The part is in the Low Power mode when the pin is pulled to a logic low level or connected to V SA, SB (Pins 2, 11): Summing Pins ...
Page 9
... PATENT PENDING Single Supply Power and Ground Connections 0.1µ DIGITAL GROUND PLANE (IF ANY) 1563 PF01 R21 R11 R31 C1A – LPA 6 INVA C2A + AGND LTC1563-X LTC1563-2/LTC1563-3 LTC1563-X ANALOG GROUND 2 15 PLANE SA LPB INVA INVB LPA AGND – 0.1µF ...
Page 10
... The maximum f limit (256kHz in High Speed C C mode and 25.6kHz in the Low Power mode) is set by the speed of the LTC1563-X’s op amps. At the maximum f the gain is also limited to unity. A minimum f is dictated by the practical limitation of C reliably obtaining large valued, precision resistors. As the desired f decreases, the resistor value required increases ...
Page 11
... These parts should not drive long traces and must never drive a long coaxial cable. When probing the LTC1563-X, always use a 10x probe. Never use a 1x probe . A standard 10x probe has a capacitance of 10pF to 15pF while a 1x probe’s capacitance can be as high as 150pF. ...
Page 12
... LP What To Do with an Unused Section 1563 F02 If the LTC1563 is used as a 2nd or 3rd order filter, one of the sections is not used. Do not leave this section uncon- nected. If the section is left unconnected, the output is left to float and oscillation may occur. The unused section should be connected as shown in Figure 4 with the INV pin connected to the LP pin and the S pin left open ...
Page 13
... CHEBYSHEV NORMALIZED 1Hz C –10 0.1 FREQUENCY (Hz) Figure 5b. Passband Frequency Response Table 1. Resistor Values, Normalized to 256kHz Cutoff Frequency (f Gain, of the 4th Order LTC1563-2 Lowpass Filter, Is Set to Unity. (Note 1) LP Mode Max Mode Max f C R11 = R21 = R31 = R12 = R22 = R32 = Example mode, 0.1dB ripple Chebyshev, 100kHz cutoff frequency, R11 = R21 = 35k ≅ 34.8k (1%), R31 = 27.39k ≅ ...
Page 14
... TIME (s) Figure 6b. Step Response Table 2. Resistor Values, Normalized to 256kHz Cutoff Frequency (f Gain, of the 4th Order LTC1563-3 Lowpass Filter, Is Set to Unity. (Note 1) LP Mode Max Mode Max f C R11 = R21 = R31 = R12 = R22 = R32 = Note 1: The resistor values listed in this table provide good approximations of the listed transfer functions. For the optimal resistor values, higher gain or other transfer functions, use FilterCAD Version 3 ...
Page 15
... Frequency Response 10 0 –10 –20 –30 –40 –50 –60 –70 –80 – FREQUENCY (kHz) 1563 TA06 LTC1563-2/LTC1563-3 Frequency Response 100 FREQUENCY (kHz) 1563 TA04 3.3V 0.1µF LTC1563 OUT 158k 15 SA LPB 100k 13 INVA INVB LPA SB 10 AGND NC 158k 9 – ...
Page 16
... C 6. Click on the Implement button the filter implementation stage the Enhanced Implement window, click on the Active RC button to choose the LTC1563-2 part. You are now done with the filter’s implementation. Click on the schematic button to view the resulting circuit. Frequency Response 10 0 – ...
Page 17
... R12 137k 10µF –5V 10µF + 4096 Point FFT of the Output Data 292.6kHz SAMPLE f = 20kHz IN –20 SINAD = 85dB THD = –91.5dB –40 –60 –80 –100 –120 –140 0 36.58 73.15 109.73 FREQUENCY (kHz) LTC1563-2/LTC1563-3 10µF + LTC1604 10Ω – SHDN REF 4 32 REFCOMP CS µP 47µF ...
Page 18
... V 0.1µF To design these wideband bandpass filters with the LTC1563, start with a 4th order lowpass filter and add two highpass poles with the input, AC coupling capacitors. The lowpass cutoff frequency and highpass pole frequencies depend on the specific application. Some experimentation of lowpass and highpass frequencies is required to achieve the desired response ...
Page 19
... BSC .015 ± .004 × 45° .0532 – .0688 (0.38 ± 0.10) (1.35 – 1.75) 0° – 8° TYP .008 – .012 (0.203 – 0.305) TYP LTC1563-2/LTC1563 –10 –20 –30 –40 –50 –60 –70 10k ...
Page 20
... INVA INVB 4.99k 6 11 LPA AGND – 0.1µ 31.6k GAIN MAXIMUM GAIN = 120kHz/f CENTER 4.99k • • CENTER CENTER Single Supply, 100kHz, Elliptic Lowpass Filter Maximum Fcutoff = 120kHz LTC1563 32. LPB 15k 4 13 INVA INVB 32.4k 32. LPA AGND – 0.1µF ...