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TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
D D D D D D D D
Low Clock-to-Cutoff-Frequency Ratio Error TLC04/MF4A-50 . . . 0.8% TLC14/MF4A-100 . . . 1% Filter Cutoff Frequency Dependent Only on External-Clock Frequency Stability Minimum Filter Response Deviation Due to External Component Variations Over Time and Temperature Cutoff Frequency Range From 0.1 Hz to 30 kHz, VCC = 2.5 V 5-V to 12-V Operation Self Clocking or TTL-Compatible and CMOS-Compatible Clock Inputs Low Supply-Voltage Sensitivity Designed to be Interchangeable With National MF4-50 and MF4-100
D OR P PACKAGE (TOP VIEW)
CLKIN CLKR LS VCC -
1 2 3 4
8 7 6 5
FILTER IN VCC+ AGND FILTER OUT
description
The TLC04/MF4A-50 and TLC14/MF4A-100 are monolithic Butterworth low-pass switched-capacitor filters. Each is designed as a low-cost, easy-to-use device providing accurate fourth-order low-pass filter functions in circuit design configurations. Each filter features cutoff frequency stability that is dependent only on the external-clock frequency stability. The cutoff frequency is clock tunable and has a clock-to-cutoff frequency ratio of 50:1 with less than 0. 8% error for the TLC04/MF4A-50 and a clock-to-cutoff frequency ratio of 100:1 with less than 1% error for the TLC14/MF4A-100. The input clock features self-clocking or TTL- or CMOS-compatible options in conjunction with the level shift (LS) terminal. The TLC04C/MF4A-50C and TLC14C/MF4A-100C are characterized for operation from 0C to 70C. The TLC04I/MF4A-50I and TLC14I/MF4A-100I are characterized for operation from - 40C to 85C. The TLC04M/MF4A-50M and TLC14M/MF4A-100M are characterized over the full military temperature range of - 55C to 125C.
AVAILABLE OPTIONS TA CLOCK-TO-CUTOFF CLOCK TO CUTOFF FREQUENCY RATIO 50:1 100:1 50:1 100:1 50:1 100:1 PACKAGE SMALL OUTLINE (D) TLC04CD/MF4A-50CD TLC14CD/MF4A-100CD TLC04ID/MF4A-50ID TLC14ID/MF4A-100ID PLASTIC DIP (P) TLC04CP/MF4A-50CP TLC14CP/MF4A-100CP TLC04IP/MF4A-50IP TLC14IP/MF4A-100IP TLC04MP/MF4A-50MP TLC14MP/MF4A-100MP
0C to 70C - 40C to 85C - 55C to 125C
The D package is available taped and reeled. Add the suffix R to the device type (e.g., TLC04CDR/MF4A-50CDR).
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright (c) 1995, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
1
TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
functional block diagram
LS CLKIN CLKR 3 1 2 Nonoverlapping Clock Generator Level Shift
1
FILTER IN AGND 8 6
2
5 FILTER OUT
Butterworth Fourth-Order Low-Pass Filter
Terminal Functions
TERMINAL NAME AGND CLKIN NO. 6 1 I/O I I DESCRIPTION Analog ground. The noninverting input to the operational amplifiers of the Butterworth fourth-order low-pass filter. Clock in. CLKIN is the clock input terminal for CMOS-compatible clock or self-clocking options. For either option, LS is at VCC - . For self-clocking, a resistor is connected between CLKIN and CLKR and a capacitor is connected from CLKIN to ground. Clock R. CLKR is the clock input for a TTL-compatible clock. For a TTL clock, LS is connected to midsupply and CLKIN can be left open, but it is recommended that it be connected to either VCC+ or VCC - . Filter input Butterworth fourth-order low-pass filter output Level shift. LS accommodates the various input clocking options. For CMOS-compatible clocks or self-clocking, LS is at VCC - and for TTL-compatible clocks, LS is at midsupply. Positive supply voltage terminal Negative supply voltage terminal
CLKR FILTER IN FILTER OUT LS VCC+ VCC -
2 8 5 3 7 4
I I O I I I
2
POST OFFICE BOX 655303
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TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, VCC (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V Operating free-air temperature range, TA: TLC04C/MF4A-50C, TLC14C/MF4A-100C . . . . . . 0C to 70C TLC04I/MF4A-50I, TLC14I/MF4A-100I . . . . . . . . - 40C to 85C TLC04M/MF4A-50M, TLC14M/MF4A-100M . . . - 55C to 125C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 65C to 150C Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260C
Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "recommended operating conditions" is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. NOTE 1: All voltage values are with respect to the AGND terminal.
recommended operating conditions
TLC04/MF4A-50 MIN Positive supply voltage, VCC+ Negative supply voltage, VCC- High-level input voltage, VIH Low-level input voltage, VIL Clock frequency, fclock (see Note 2) frequency l k Cutoff frequency, fco (see Note 3) TLC04C/MF4A-50C, TLC14C/MF4A-100C Operating free-air temperature, TA TLC04I/MF4A-50I, TLC14I/MF4A-100I TLC04M/MF4A-50M, TLC14M/MF4A-100M VCC = 2.5 V VCC = 5 V 5 5 0.1 0 - 40 - 55 2.25 - 2.25 2 0.8 1.5 x 106 2 x 106 40 x 103 70 85 125 MAX 6 -6 TLC14/MF4A-100 MIN 2.25 - 2.25 2 5 5 0.05 0 - 40 - 55 0.8 1.5 x 106 2 x 106 20 x 103 70 85 125 C MAX 6 -6 UNIT V V V V Hz Hz
NOTES: 2. Above 250 kHz, the input clock duty cycle should be 50% to allow the operational amplifiers the maximum time to settle while processing analog samples. 3. The cutoff frequency is defined as the frequency where the response is 3.01 dB less than the dc gain of the filter.
electrical characteristics over recommended operating free-air temperature range, VCC+ = 2.5 V, VCC- = -2.5 V, fclock 250 kHz (unless otherwise noted)
filter section
TLC04/MF4A-50 PARAMETER VOO VOM IOS Output offset voltage Peak output voltage Short-circuit Short circuit output current VOM+ VOM - Source Sink RL = 10 k TA = 25C, 25C See Note 4 1.8 - 1.25 TEST CONDITIONS MIN TYP 25 2 - 1.7 - 0.5 4 1.8 - 1.25 MAX TLC14/MF4A-100 MIN TYP 50 2 - 1.7 - 0.5 4 MAX UNIT mV V mA
ICC Supply current fclock = 250 kHz 1.2 2.25 1.2 2.25 mA All typical values are at TA = 25C. NOTE 4: IOS(source) is measured by forcing the output to its maximum positive voltage and then shorting the output to the VCC - terminal IOS(sink) is measured by forcing the output to its maximum negative voltage and then shorting the output to the VCC+ terminal.
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
3
TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
electrical characteristics over recommended operating free-air temperature range, VCC+ = 5 V, VCC- = -5 V, fclock 250 kHz (unless otherwise noted)
filter section
PARAMETER VOO VOM IOS Output offset voltage Peak output voltage Short-circuit Short circuit output current VOM+ VOM - Source Sink RL = 10 k TA = 25C, , See Note 4 3.75 - 3.75 TEST CONDITIONS MIN TLC04/MF4A-50 TYP MAX 150 4.3 - 4.1 -2 5 3.75 - 3.75 MIN TLC14/MF4A-100 TYP MAX 200 4.5 - 4.1 -2 5 UNIT mV V mA
ICC Supply current fclock = 250 kHz 1.8 3 1.8 3 mA kSVS Supply voltage sensitivity (see Figures 1 and 2) - 30 - 30 dB All typical values are at TA = 25C. NOTE 4: IOS(source) is measured by forcing the output to its maximum positive voltage and then shorting the output to the VCC - terminal. IOS(sink) is measured by forcing the output to its maximum negative voltage and then shorting the output to the VCC+ terminal.
clocking section
PARAMETER VIT IT+ VIT - Vh hys VOH VOL Positive-going Positive going input threshold voltage Negative-going Negative going input threshold voltage Hysteresis voltage (VIT - VIT-) IT+ IT High level output voltage High-level Low-level Low level output voltage Input leakage current CLKR CLKIN TEST CONDITIONS VCC+ = 10 V, VCC - = 0 VCC+ = 5 V, VCC - = 0 VCC+ = 10 V, VCC - = 0 VCC+ = 5 V, VCC - = 0 VCC+ = 10 V, VCC - = 0 VCC+ = 5 V, VCC - = 0 VCC = 10 V VCC = 5 V VCC = 10 V VCC = 5 V VCC = 10 V VCC = 5 V VCC = 10 V VCC = 5 V VCC = 10 V VCC = 5 V IO = - 10 A IO = 10 A LS at midsupply, y, TA = 25C CLKR and CLKIN shortened to VCC - CLKR and CLKIN shortened to VCC+ -3 - 0.75 3 0.75 -7 -2 7 2 MIN 6.1 3.1 1.3 0.6 2.3 1.2 9 4.5 1 0.5 2 2 TYP 7 3.5 3 1.5 4 2 MAX 8.9 4.4 3.8 1.9 7.6 3.8 UNIT V V V V V A mA mA
IO
Output current
All typical values are at TA = 25C.
4
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
operating characteristics over recommended operating free-air temperature range, VCC+ = 2.5 V, VCC- = -2.5 V (unless otherwise noted)
TLC04/MF4A-50 PARAMETER Maximum clock frequency, fmax Clock-to-cutoff-frequency ratio (fclock/fco) Temperature coefficient of clock-to-cutoff frequency ratio TEST CONDITIONS See Note 2 fclock 250 kHz, fclock 250 kHz fco = 5 kHz, fclock = 250 kHz, kHz lk TA = 25C fco = 5 kHz, fclock = 250 kHz, kHz lk TA = 25C TA = 25C fclock 250 kHz fclock 250 kHz, TA = 25C RS 2 k f = 6 kHz f = 4.5 kHz f = 3 kHz f = 2.25 kHz 80 24 - 0.15 25 0 0.15 24 - 0.15 - 7.9 - 1.7 TA = 25C MIN 1.5 49.27 TYP 3 50.07 25 - 7.57 - 1.46 - 7.1 dB - 1.3 - 7.9 - 1.7 - 7.42 -1.51 78 25 0 0.15 - 7.1 dB - 1.3 dB dB dB 50.87 MAX TLC14/MF4A-100 MIN 1.5 99 TYP 3 100 25 101 MAX UNIT MHz Hz/Hz ppm/C
Frequency response above and below q y cutoff frequency (see Note 5)
Dynamic range (see Note 6) Stop-band frequency attentuation at 2 fco Voltage amplification, dc
Peak-to-peak clock feedthrough voltage 5 5 mV All typical values are at TA = 25C. NOTES: 2. Above 250 kHz, the input clock duty cycle should be 50% to allow the operational amplifiers the maximum time to settle while processing analog samples. 5. The frequency responses at f are referenced to a dc gain of 0 dB. 6. The dynamic range is referenced to 1.06 V rms (1.5 V peak) where the wideband noise over a 30-kHz bandwidth is typically 106 V rms for the TLC04/MF4A-50 and 135 V rms for the TLC14/MF4A-100.
operating characteristics over recommended operating free-air temperature range, VCC+ = 5 V, VCC- = -5 V (unless otherwise noted)
TLC04/MF4A-50 PARAMETER Maximum clock frequency, fmax Clock-to-cutoff-frequency ratio (fclock/fco) Temperature coefficient of clock-to-cutoff frequency ratio TEST CONDITIONS See Note 2 fclock 250 kHz, fclock 250 kHz fco = 5 kHz, fclock = 250 kHz, kHz lk TA = 25C fco = 5 kHz, fclock = 250 kHz, kHz lk TA = 25C TA = 25C fclock 250 kHz fclock 250 kHz, f = 6 kHz f = 4.5 kHz f = 3 kHz f = 2.25 kHz 86 24 RS 2 k - 0.15 25 0 0.15 24 - 0.15 - 7.9 - 1.7 TA = 25C MIN 2 49.58 TYP 4 49.98 15 - 7.57 - 1.44 - 7.1 dB - 1.3 - 7.9 - 1.7 - 7.42 -1.51 84 25 0 0.15 - 7.1 dB - 1.3 dB dB dB 50.38 MAX TLC14/MF4A-100 MIN 2 99 TYP 4 100 15 101 MAX UNIT MHz Hz/Hz ppm/C
Frequency response above and below q y cutoff frequency (see Note 5)
Dynamic range (see Note 6) Stop-band frequency attentuation at 2 fco Voltage amplification, dc
Peak-to-peak clock feedthrough voltage TA = 25C 7 7 mV All typical values are at TA = 25C. NOTES: 2. Above 250 kHz, the input clock duty cycle should be 50% to allow the operational amplifiers the maximum time to settle while processing analog samples. 5. The frequency responses at f are referenced to a dc gain of 0 dB. 6. The dynamic range is referenced to 2.82 V rms (4 V peak) where the wideband noise over a 30-kHz bandwidth is typically 142 V rms for the TLC04/MF4A-50 and 178 V rms for the TLC14/MF4A-100.
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TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
TYPICAL CHARACTERISTICS
FILTER OUTPUT vs SUPPLY VOLTAGE VCC+ RIPPLE FREQUENCY
0 VCC+ = 5 V + 50-mV Sine Wave (0 to 40 kHz) VCC - = - 5 V Filter in at 0 V fclock = 250 kHz
- 10
Filter Output - dB
- 20
- 30
- 40
- 50
- 60 0 5 10 15 20 25 30 35 40 Supply Voltage VCC+ Ripple Frequency - kHz
Figure 1
FILTER OUTPUT vs SUPPLY VOLTAGE VCC - RIPPLE FREQUENCY
0 VCC+ = 5 V VCC - = - 5 V + 50-mV Sine Wave (0 to 40 kHz) Filter in at 0 V fclock = 250 kHz
- 10
Filter Output - dB
- 20
- 30
- 40
- 50
- 60 0 5 10 15 20 25 30 35 40 Supply Voltage VCC - Ripple Frequency - kHz
Figure 2
6
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
APPLICATION INFORMATION
5V 7 VCC+ 3 CMOS CLKIN 5V -5 V 1 2 LS CLKIN CLKR Level Shift
Nonoverlapping Clock Generator
1
8 6 FILTER IN AGND VCC - 4 -5 V
2
5 FILTER OUT
Butterworth Fourth-Order Low-Pass Filter
Figure 3. CMOS-Clock-Driven Dual-Supply Operation
5V 7 VCC+ 3 1 TTL CLKR -5 V 0V Nonoverlapping Clock Generator 2 LS CLKIN CLKR Level Shift
1
8 6 FILTER IN AGND VCC - 4 -5 V
2
5 FILTER OUT
Butterworth Fourth-Order Low-Pass Filter
Figure 4. TTL-Clock-Driven Dual-Supply Operation
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
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TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
APPLICATION INFORMATION
5V 7 VCC+ 3 1 R 2 LS CLKIN CLKR Level Shift
C
Nonoverlapping Clock Generator
1
Filter Input 8 6 FILTER IN AGND VCC - 4 -5 V f clock
2
FILTER OUT 5 Filter Output
Butterworth Fourth-Order Low-Pass Filter
+
RC In
1 V V -V CC IT- -V CC IT) V IT) V IT-
For VCC = 10 V fclock = 1 1.69 RC
Figure 5. Self-Clocking Through Schmitt-Trigger Oscillator Dual-Supply Operation
8
POST OFFICE BOX 655303
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TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
APPLICATION INFORMATION
10 V 7 VCC+ 3 10 V CMOS CLKIN See Note A TTL CLKR 0V FILTER IN (see Note B) 5 VOC 8 6 FILTER IN AGND VCC - 10 k See Note C 4 0V -5 V 10 k Nonoverlapping Clock Generator 1 2 CLKIN CLKR LS Level Shift
1
2
FILTER OUT 5
Butterworth Fourth-Order Low-Pass Filter
0.1 F
NOTES: A. The external clock used must be of CMOS level because the clock is input to a CMOS Schmitt trigger. B. The filter input signal should be dc-biased to midsupply or ac-coupled to the terminal. C. AGND must be biased to midsupply.
Figure 6. External-Clock-Driven Single-Supply Operation
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TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
APPLICATION INFORMATION
10 V 7 VCC+ 3 LS Level Shift
1 R 2
CLKIN CLKR Nonoverlapping Clock Generator
C
10 k
1
8 6 FILTER IN AGND Butterworth Fourth-Order Low-Pass Filter VCC - 10 k 4 See Note A
2
FILTER OUT
5
0.1 F
f
clock
+
RC In
1 V V -V CC IT- -V CC IT) V IT) V IT-
For VCC = 10 V fclock = NOTE A: AGND must be biased to midsupply. 1 1.69 RC
Figure 7. Self Clocking Through Schmitt-Trigger Oscillator Single-Supply Operation
10
POST OFFICE BOX 655303
* DALLAS, TEXAS 75265
TLC04/MF4A-50, TLC14/MF4A-100 BUTTERWORTH FOURTH-ORDER LOW-PASS SWITCHED-CAPACITOR FILTERS
SLAS021A - NOVEMBER 1986 - REVISED MARCH 1995
APPLICATION INFORMATION
5V 7 VCC+ 3 LS Level Shift
Clock Input
1 2
CLKIN CLKR
Nonverlapping Clock Generator
1
8 6 10 k 0.1 F -5 V FILTER IN AGND VCC - 4 Butterworth Fourth-Order Low-Pass Filter
2
FILTER OUT 5
Figure 8. DC Offset Adjustment
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Copyright (c) 1998, Texas Instruments Incorporated

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