ltc1067-50 Linear Technology Corporation, ltc1067-50 Datasheet
ltc1067-50
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ltc1067-50 Summary of contents
Page 1
... The LTC1067- low power device con- suming about one half the current of the LTC1067. The LTC1067-50’s typical supply current is about 1mA from a 3.3V supply. The LTC1067 and LTC1067-50 are available in 16-pin narrow SSOP and SO packages ...
Page 2
... NUMBER 16 CLK 15 AGND LTC1067CGN – LTC1067-50CGN 13 SB LTC1067IGN 12 LPB LTC1067-50IGN 11 BPB LTC1067CS 10 HPB/NB LTC1067-50CS 9 INV B LTC1067IS LTC1067-50IS S PACKAGE 16-LEAD PLASTIC SO = 135 C/ W (GN 115 4.75V unless otherwise noted MIN TYP MAX 3 11 2.65 2.80 4.25 4.50 4.15 4.50 0.020 0.200 0.025 0.225 – ...
Page 3
... OS2 V OS3 Clock Feedthrough Maximum Clock Frequency Q < 2.5, V Power Supply Current 4.75V 5V LTC1067-50 (internal op amps 4.75V PARAMETER CONDITIONS Operating Supply Range Positive Output Voltage Swing 4.75V 5V Negative Output Voltage Swing ...
Page 4
... LTC1067/LTC1067-50 ELECTRICAL CHARACTERISTICS LTC1067-50 (complete filter 4.75V PARAMETER CONDITIONS f Temperature Coefficient O Q Temperature Coefficient DC Offset Voltage (See Table 2) V (DC Offset of Input Inverter) OS1 V (DC Offset of First Integrator) OS2 V (DC Offset of Second Integrator) OS3 Clock Feedthrough Maximum Clock Frequency Q < 2.5, V Power Supply Current ...
Page 5
... Power Supply Current vs Power Supply 4.5 4 3.5 3.0 – 2.0 1 TOTAL POWER SUPPLY (V) 1067 G12 LTC1067-50 Noise + THD vs Input Voltage –20 4TH ORDER BUTTERWORTH LPF V = SINGLE 3V 1kHz – 200kHz 4kHz CLK –3dB –40 –50 –60 MODE 1 –70 –80 MODE 3 – ...
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... CLK – 5kHz IN RMS –3dB R = 20k L –70 MODE 1 –75 MODE 3 –80 –85 – INPUT FREQUENCY (kHz) 1067 G20 LTC1067-50 Output Voltage Swing vs Load Resistance, Single Supply Voltage 5 4.5 S 4.0 3.5 3 2.5 2.0 1.5 1 – LOAD RESISTANCE ( ...
Page 7
... 0 200 CLOCK SOURCE FOR MODE 3, THE SA AND SB SUMMING NODE PINS 1067 F01 ARE TIED TO THE AGND PIN Figure 2. Single Supply Ground Plane Connections LTC1067/LTC1067-50 LTC1067/LTC1067-50 Mode 3 Noise Increase vs R2/R4 Ratio 2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 0.6 0.8 0.9 1.0 0.2 0.3 0.4 0.5 0.7 R2/R4 RATIO ...
Page 8
... LTC1067/LTC1067- PIN FUNCTIONS SA, SB (Pins 4, 13): Summing Inputs. The summing pins’ connection, along with the other resistor connections, determine the circuit topology (mode) of each 2nd order section. These pins should never be left floating. LPA, BPA, HPA/NA, HPB/NB, BPB, LPB (Pins 10, 11, 12): Output Pins ...
Page 9
... W ODES OF OPERATIO Linear Technology’s universal switched-capacitor filters are designed with a fixed internal, nominal f The LTC1067 has a 100:1 f CLK LTC1067-50 has a 50 ratio. Filter designs often CLK O require the f /f ratio of each section to be different from CLK O the nominal ratio and in most cases different from each other ...
Page 10
... CLK RATIO RATIO – (RATIO)(0.32)(R4 – (AC GAIN, f >> – O OHPN – – OLP – (RATIO)(0.32)(R4 FOR LTC1067- 1067 F05 – OLP R1 LP 1067 F06 (DC GAIN ...
Page 11
... AMP OF THE LTC1067, SIDES 1067 F07 R2 CLK 0 – (RATIO)(0.32)(R4 FOR LTC1067- LOWPASS NOTCH OUTPUT EXTERNAL OP AMP OR INPUT OP AMP OF THE LTC1067, SIDES 1067 F08 ...
Page 12
... The Maximum Q vs Frequency (f ) graphs, under Typical O Performance Characteristics, define an upper limit of operating Q for each LTC1067 (or LTC1067-50) 2nd order section. These graphs indicate the power supply, f value conditions under which a filter implemented with an LTC1067 will remain stable when operated at tempera- tures less. For a 2nd order section, a bandpass gain error of 3dB or less is arbitrarily defined as a condition for stability ...
Page 13
... The 1 probe will probably cause oscillation. ) that falls into the IN What to Do with an Unused Section If the LTC1067 or LTC1067-50 is used as a single 2nd . If the CLK order filter, the other 2nd order section is not used. Do not leave this section unconnected. If the section is uncon- nected, inputs and outputs are left to float to undetermined levels and oscillation may occur ...
Page 14
... ADC running on a single 5V supply with a 4.096 reference voltage is a standard example. The LTC1067 or LTC1067-50 will easily reach the 4.096V level for a full- scale reading. The issue is how close does the output go to ground. The further the output is from ground, the more codes that are essentially lost ...
Page 15
... ADC and a 0V input signal gives the lowest possible value. For this application, the power supply must be above 2.7V for an LTC1067-50 filter and above 3V for an LTC1067 filter ...
Page 16
... IN TP10 Figure 15. Schematic for the LTC1067/LTC1067-50 Demo Board Several other jumpers should be connected as follows: JP1: Install a jumper wire from position 1 to position 2, leave the other positions open. JP5: Install a jumper wire if split supply, leave open if single supply. ...
Page 17
... U U APPLICATIONS INFORMATION Figure 16. Silkscreen for the LTC1067/LTC1067-50 Demo Board U TYPICAL APPLICATIONS 5th Order Lowpass with Input RC (Fixed Frequency) 5V 0.1 F R41, 20k R31, 47. R21, 22.6k R IN1 R IN2 16.9k 22.6k C IN1 1500pF 5% Frequency Response (f CUTOFF 10 0 –10 –20 –30 –40 –50 –60 –70 –80 – ...
Page 18
... CENTER CLK CENTER 64kHz V CLK AGND – R62 SA SB R52 8.66k LTC1067-50 4.99k 12 5 LPA LPB R32, 255k 11 6 BPA BPB R22, 4.99k 10 7 HPA/NA HPB/ INV A INV 115k B1 – (OR 2.5V) 3V (OR 1.5V) ...
Page 19
... Plastic SSOP (Narrow 0.150) (LTC DWG # 05-08-1641) 45 0.053 – 0.068 0.004 – 0.0098 (1.351 – 1.727) (0.102 – 0.249) 0.008 – 0.012 0.025 (0.203 – 0.305) (0.635) BSC LTC1067/LTC1067-50 Sine Burst Response V IN (500mV/DIV) V OUT (50mV/DIV) 5ms/DIV Frequency Response ...
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... LTC1067/LTC1067-50 PACKAGE DESCRIPTION 0.010 – 0.020 45 0.053 – 0.069 (0.254 – 0.508) (1.346 – 1.752) 0.008 – 0.010 (0.203 – 0.254) 0 – 8 TYP 0.014 – 0.019 0.016 – 0.050 (0.355 – 0.483) 0.406 – 1.270 * DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" ...