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Final Electrical Specifications
LTC1068-50 Low Power, High Accuracy Quad Universal Filter Building Block FEATURES
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DESCRIPTIO
February 1998
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Four Identical 2nd Order Filters in an SSOP Package Center Frequency Error: 0.3% Low Noise: 40VRMS per 2nd Order Section, Q 5 High Dynamic Range: THD + Noise 0.01% Low DC Offsets: 10mV per 2nd Order Section Clock-to-Center Frequency Ratio: 50:1 No Aliasing for Input Frequencies up to 100 x fCUTOFF Maximum Center Frequency up to 50kHz (VS = 5V) Operates from 1.57V to 5V Power Supplies
The LTC (R)1068-50 consists of four identical, low noise, high accuracy 2nd order switched-capacitor filter building blocks. Each building block, together with three to five resistors, can provide 2nd order filter functions like lowpass, bandpass, highpass and notch. High precision, high performance, quad 2nd order, dual 4th order or 8th order filters can also be designed with an LTC1068-50. The center frequency of each 2nd order section is tuned by an external clock. The clock-to-center frequency ratio is internally set to 50:1 and can be modified by external resistors. The sampling rate of the LTC1068-50 is twice the clock frequency. The maximum input frequency can approach twice the clock frequency before aliasing occurs. A customized version of the LTC1068-50 in a 16-lead SO with internal thin film resistors can be obtained. Clock-tocenter frequency ratios higher or lower than 50:1 can also be obtained. Please contact LTC Marketing for details. The LTC1068-50 is available in a 28-pin SSOP surface mount package and is supported by FilterCADTM 2.0 filter design software.
APPLICATI
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Low Power Linear Phase Bandpass Filters (Up to 40kHz, VS = Single 5V) Dual 4th Order Phase Matched Filters (Up to 40kHz, VS = Single 5V) Low Power Tone Detectors (High Selectivity Bandpass Filters up to 30kHz, VS = Single 5V)
, LTC and LT are registered trademarks of Linear Technology Corporation. FilterCAD is a trademark of Linear Technology Corporation.
TYPICAL APPLICATI
VIN R11 22.6k RB1, 13.3k 1 R21, 20.5k R31, 10k R41, 22.6k 2 3 4 INV B HPB/NB BPB LPB
Low Power, Single 5V Supply, 10kHz, 8th Order, Linear Phase Lowpass Filter
RA1, 56.2k INV C HPB/NC BPC 28 27 26 25 24 23 22 21 20 19 18 17 16 15 R44, 34.8k R34, 14.3k R24, 16.9k 500kHZ R22, 43.2k RL2, 9.09k RH2, 34k
R42, 196k
5V 0.1F R43, 48.7k 1F R33, 12.7k R23, 10.7k
LPC 5 SB SC 6 V- NC 7 NC AGND 8+ CLK V LTC1068-50 NC 9 NC 10 SA SD 11 LPA LPD 12 BPA BPD 13 HPA/NA HPD 14 INV A INV D RB3, 24.9k
GAIN (dB)
R32, 43.2k
5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 1 10 FREQUENCY (kHz) 100
1068-50 TA02
RL3 26.7k
VOUT
1068-50 TA01
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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UO
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Frequency Response
1
LTC1068-50 ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO
TOP VIEW INV B HPB/NB BPB LPB SB NC AGND V+ NC 1 2 3 4 5 6 7 8 9 28 INV C 27 HPC/NC 26 BPC 25 LPC 24 SC 23 V - 22 NC 21 CLK 20 NC 19 SD 18 LPD 17 BPD 16 HPD/ND 15 INV D
Total Supply Voltage (V + to V -) .............................. 12V Power Dissipation ............................................. 500mW Operating Temperature Range LTC1068CG-50 ........................................ 0C to 70C LTC1068IG-50 ................................... - 40C to 85C Input Voltage at Any Pin ... V - - 0.3V VIN V + + 0.3V Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC1068CG-50 LTC1068IG-50
SA 10 LPA 11 BPA 12 HPA/NA 13 INV A 14
G PACKAGE 28-LEAD PLASTIC SSOP
TJMAX = 125C, JA = 95C/W
Consult factory for Military grade parts.
ELECTRICAL CHARACTERISTICS
PARAMETER Operating Supply Voltage Range Voltage Swings CONDITIONS
(Internal Op Amps) VS = 5V, TA = 25C, unless otherwise specified.
MIN 3.14
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TYP 1.8 3.6 4.1 17/6 20/15 85 4 10
MAX 5.5
UNITS V VP-P VP-P V mA mA dB MHz V/s V
VS = 3.14V, RL = 5k (Note 1) VS = 4.75V, RL = 5k (Note 2) VS = 5V, RL = 5k VS = 3.14V (Note 1) VS = 5V RL = 5k
1.2 2.6 3.4
Output Short-Circuit Current (Source/Sink) DC Open-Loop Gain GBW Product Slew Rate Analog Ground Voltage
VS = 5V, Voltage at Pin 7 (AGND) (Note 3)
2.175
(Complete Filter) TA = 25C, unless otherwise specified.
PARAMETER Clock-to-Center Frequency, fCLK/fO (Note 5) CONDITIONS VS = 3.14V, fCLK = 250kHz, Mode 1 (Note 1), fO = 5kHz, Q = 5, VIN = 0.34VRMS, R1 = R3 = 49.9k, R2 = 10k VS = 5V, fCLK = 500kHz, Mode 1, fO = 10kHz, Q = 5, VIN = 1VRMS, R1 = R3 = 49.9k, R2 = 10k Clock-to-Center Frequency Ratio, Side-to-Side Matching (Note 5) Q Accuracy (Note 5) VS = 3.14V, fCLK = 250kHz, Q = 5 (Note 1) VS = 5V, fCLK = 500kHz, Q = 5 VS = 3.14V, fCLK = 250kHz, Q = 5 (Note 1) VS = 5V, fCLK = 500kHz, Q = 5
q
MIN
TYP 50 0.3%
MAX 50 0.8% 50 0.9% 50 0.8% 50 0.9% 0.9 0.9 3 3
UNITS
50 0.3%
q q q q q
0.25 0.25 1 1
2
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% % % %
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LTC1068-50
ELECTRICAL CHARACTERISTICS
PARAMETER fO Temperature Coefficient Q Temperature Coefficient DC Offset Voltage (Note 5) (See Table 1) CONDITIONS
(Complete Filter) TA = 25C, unless otherwise specified.
MIN TYP 1 5 MAX UNITS ppm/C ppm/C 15 25 40 mV mV mV mVRMS MHz 5 8 11 mA mA mA
VS = 5V, fCLK = 500kHz, VOS1 (DC Offset of Input Inverter) VS = 5V, fCLK = 500kHz, VOS2 (DC Offset of First Integrator) VS = 5V, fCLK = 500kHz, VOS3 (DC Offset of Second Integrator)
q q q
0 -2 -5 0.16 3.4
Clock Feedthrough Maximum Clock Frequency Power Supply Current
VS = 5V, fCLK = 500kHz VS = 5V, Q 1.6, Mode 1 VS = 3.14V, fCLK = 250kHz (Note 1) VS = 4.75V, fCLK = 250kHz (Note 2) VS = 5V, fCLK = 500kHz
q q q
3.0 4.3 6.0
The q denotes specifications which apply over the full operating temperature range. Note 1: Production testing for single 3.14V supply is achieved by using the equivalent dual supplies of 1.7696V and -1.3704V. Note 3 is an explanation for using nonsymmetrical power supplies. Note 2: Production testing for single 4.75V supply is achieved by using the equivalent dual supplies of 2.6771V and - 2.0729V. Note 3 is an explanation for using nonsymmetrical power supplies.
Note 3: Pin 7 (AGND) is the internal analog ground of the device. For single supply applications this pin should be bypassed with a 1F capacitor. The biasing voltage of AGND is set with an internal resistive divider from Pin 8 to Pin 23, the value of AGND = 0.435 * V +. Note 4: See typical performance characteristics. Note 5: Side D is guaranteed by design.
Table 1. Output DC Offsets One 2nd Order Section
MODE 1 1B 2 3 VOSN VOS1[(1/Q) + 1 + HOLP] - VOS3/Q VOS1[(1/Q) + 1 + R2/R1] - VOS3/Q [VOS1(1 + R2/R1 + R2/R3 + R2/R4) - VOS3(R2/R3)X [R4/(R2 + R4)] + VOS2[R2/(R2 + R4)] VOS2 VOSBP VOS3 VOS3 VOS3 VOS3 VOSLP VOSN - VOS2 ~(VOSN - VOS2)(1 + R5/R6) VOSN - VOS2 VOS1[1 + R4/R1 + R4/R2 + R4/R3] - VOS2(R4/R2) - VOS3(R4/R3)
TYPICAL PERFORMANCE CHARACTERISTICS
Maximum Q vs Frequency (Modes 1, 1B, 2)
55 50 45 TYPICAL MAXIMUM Q 40 35 30 25 20 15 10 5 0 0 4 8 12 16 20 24 FREQUENCY, fO (kHz) 28 32 A B C A: VS = 3.3V, fCLK(MAX) = 1.1MHz B: VS = 5V, fCLK(MAX) = 2.1MHz C: VS = 5V, fCLK(MAX) = 3.6MHz
TYPICAL MAXIMUM Q
(FOR MODE 2, R4 10R2)
UW
Maximum Q vs Frequency (Modes 2, 3)
55 50 45 40 35 30 25 20 15 10 5 0 0 4 8 12 16 20 24 FREQUENCY, fO (kHz) 28 32 A C B A: VS = 3.3V, fCLK(MAX) = 1.1MHz B: VS = 5V, fCLK(MAX) = 2.1MHz C: VS = 5V, fCLK(MAX) = 3.6MHz (FOR MODE 2, R4 < 10R2)
1068-50 G01
1068-50 G02
3
LTC1068-50
BLOCK DIAGRAM
V+ NC AGND 8 9 7
NC 6 V - 23 NC 22
CLK 21 NC 20
NOTE: THE RATIO OF Ra/Rb CAN VARY BY 0.8%. THE ABSOLUTE VALUE OF Ra OR Rb CAN VARY BY 25%
PACKAGE DESCRIPTION
0.205 - 0.212** (5.20 - 5.38)
0 - 8
0.005 - 0.009 (0.13 - 0.22)
0.022 - 0.037 (0.55 - 0.95)
0.0256 (0.65) BSC
*DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE **DIMENSIONS DO NOT INCLUDE INTERLEAD FLASH. INTERLEAD FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
RELATED PARTS
PART NUMBER LTC1068 LTC1068-25 LTC1068-200 LTC1064 LTC1164 LTC1264 DESCRIPTION Low Noise Universal Filter High Speed Universal Filter Universal Filter Universal Filter Low Power Universal Filter High Speed Universal Filter COMMENTS 100:1 Clock-to-fO Ratio, fC to 50kHz 25:1 Clock-to-fO Ratio, fC to 200kHz 200:1 Clock-to-fO Ratio, fC to 25kHz 50:1 and 100:1 Clock-to-fO Ratios, fC to 100kHz, VS = Up to 7.5V 50:1 and 100:1 Clock-to-fO Ratios, fC to 20kHz, VS = Up to 7.5V 20:1 Clock-to-fO Ratio, fC to 200kHz, VS = Up to 7.5V
106850i LT/TP 0298 4K * PRINTED IN USA
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417 q (408) 432-1900 FAX: (408) 434-0507q TELEX: 499-3977 q www.linear-tech.com
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INV A 14 Ra 11.3k INV B 1 HPA/NA 13 BPA 12 LPA 11
- +
HPB/NB 2
+
-
BPB 3
LPB 4
10 SA
Rb 8.6k
- +
HPC/NC
+
-
BPC 26
LPC 25
5 SB
INV C 28
27
- +
HPD
+
-
BPD 17
LPD 18
24 SC
INV D 15
16
- +
+
-
1068-50 BD
19 SD
Dimensions in inches (millimeters) unless otherwise noted. G Package 28-Lead Plastic SSOP (0.209)
(LTC DWG # 05-08-1640)
0.397 - 0.407* (10.07 - 10.33) 28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.068 - 0.078 (1.73 - 1.99) 0.301 - 0.311 (7.65 - 7.90)
0.010 - 0.015 (0.25 - 0.38)
0.002 - 0.008 (0.05 - 0.21) 1 2 3 4 5 6 7 8 9 10 11 12 13 14
G28 SSOP 0694
(c) LINEAR TECHNOLOGY CORPORATION 1998

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