TC1026CEUA

TC1026 Linear Building Block – Low Power Comparator with Op Amp and Voltage Reference Features • Combines Low-Power Op Amp, Comparator and Voltage Reference in a Single Package • Optimized for Single Supply Operation • Small Packages: 8-Pin MSOP, 8-Pin SOIC, 8-Pin PDIP • Ultra Low Input Bias Current: Less than 100pA • Low Quiescent Current: 12µA (Typ.) • Rail-to-Rail Inputs and Outputs • Operates Down to VDD = 1.8V, Min General Description The TC1026 is a mixed-function device combining a general-purpose op amp, comparator and voltage reference in a single 8-pin package. This increased integration allows the user to replace two or three packages, which saves space, lowers supply current and increases system performance. Both the op amp and comparator have rail-to-rail inputs and outputs which allows operation from low supply voltages with large input and output swings. The TC1026 is optimized for low voltage (VDD = 1.8V), low supply current (12µA typ) operation. Packaged in a space-saving 8-Pin MSOP, the TC1026 consumes half the board area of an 8-Pin SOIC and is ideal for applications requiring high integration, small size and low power. It is also available in 8-Pin SOIC and 8-Pin PDIP packages. Applications • Power Management Circuits • Battery Operated Equipment • Consumer Products Device Selection Table Part Number TC1026CEPA TC1026CEUA TC1026CEOA Package 8-Pin PDIP 8-Pin MSOP 8-Pin SOIC Temperature Range -40°C to +85°C -40°C to +85°C -40°C to +85°C Functional Block Diagram AMPOUT 1 TC1026 8 VDD AMPIN- 2 7 CMPOUT AMP + CMP 6 + Package Types 8-Pin PDIP 8-Pin MSOP 8-Pin SOIC AMPOUT AMPIN AMPIN+ VSS 1 2 3 4 8 7 VDD CMPOUT REF (CMPIN) CMPIN+ AMPIN+ 3 REF (CMPIN-) VSS 4 Voltage Reference 5 CMPIN+ TC1026CEPA TC1026CEUA TC1026CEOA 6 5 2002 Microchip Technology Inc. DS21725B-page 1 © TC1026 1.0 ELECTRICAL CHARACTERISTICS *Stresses above 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 above those indicated in the operation sections of the specifications is not implied. Exposure to Absolute Maximum Rating conditions for extended periods may affect device reliability. ABSOLUTE MAXIMUM RATINGS* Supply Voltage ......................................................6.0V Package Power Dissipation: 8-Pin PDIP ...............................................730 mW 8-Pin SOIC ...............................................470 mW 8-Pin MSOP .............................................320 mW Voltage on Any Pin .......... (V SS – 0.3V) to (VDD + 0.3V) Junction Temperature....................................... +150°C Operating Temperature Range............. -40°C to +85°C Storage Temperature Range .............. -55°C to +150°C TC1026 ELECTRICAL SPECIFICATIONS Electrical Characteristics: Typical values apply at 25°C and VDD = 3.0V; TA = -40° to +85°C, and VDD = 1.8V to 5.5V, unless otherwise specified. Symbol VDD IQ Op Amp AVOL VICMR VOS IB VOS (DRIFT) GBWP SR Large Signal Voltage Gain Common Mode Input Range Input Offset Voltage Input Bias Current Input Offset Voltage Drift Gain-Bandwidth Product Slew Rate -100 — — — — VSS – 0.2 100 — ±100 ±0.3 50 ±4 90 35 — VDD + 0.2 ±500 ±1.5 100 — — — V/mV V µV mV pA µ V/°C kHz VDD = 3V, VCM = 1.5V, TA = 25°C TA = -40°C to 85°C TA = 25°C, VCM = VDD to VSS VDD = 3V, VCM = 1.5V VDD = 1.8V to 5.5V; VO = VDD to VSS RL = 10kΩ, VDD = 5V Parameter Supply Voltage Supply Current Min 1.8 — Typ — 12 Max 5.5 18 Units V µA All outputs unloaded Test Conditions mV/µsec CL = 100pF RL = 1MΩ to GND Gain = 1 VIN = VSS to VDD V dB dB mA RL = 10kΩ TA = 25°C, VDD = 5V VCM = VDD to VSS TA = 25°C, VCM = VSS VDD = 1.8V to 5V VIN+ = VDD, VIN - = VSS Output Shorted to VSS VDD = 1.8V, Gain = 1 IN+ = VSS, IN- = VDD Output Shorted to VDD VDD = 1.8V, Gain = 1 0.1Hz to 10Hz 1kHz VOUT CMRR PSRR ISRC Output Signal Swing Common Mode Rejection Ratio Power Supply Rejection Ratio Output Source Current VSS + 0.05 66 80 3 — — — — VDD – 0.05 — — — ISINK Output SInk Current — 125 — nV/Hz En en Comparator VIR VOS IB VOH VOL Input Noise Voltage Input Noise Voltage Density Input Voltage Range Input Offset Voltage Input Bias Current Output High Voltage Output Low Voltage — — VSS – 0.2 -5 -5 –– VDD – 0.3 — 10 125 — — — — — — — — VDD + 0.2 +5 +5 ±100 — 0.3 µVpp nV/√Hz V mV pA V V VDD = 3V, TA = 25°C TA = -40°C to 85°C TA = 25°C, IN+ = VDD to VSS RL = 10kΩ to VSS RL = 10kΩ to VDD © DS21725B-page 2 2002 Microchip Technology Inc. TC1026 TC1026 ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: Typical values apply at 25°C and VDD = 3.0V; TA = -40° to +85°C, and VDD = 1.8V to 5.5V, unless otherwise specified. Symbol PSRR ISRC Parameter Power Supply Rejection Ratio Output Source Current Min 60 1 Typ — — Max — — Units dB mA Test Conditions TA = 25°C VDD = 1.8V to 5V IN+ = VDD Output Shorted to VSS VDD = 1.8V IN+ = VSS Output Shorted to VDD VDD = 1.8V 100mV Overdrive, CL = 100pF 10mV Overdrive, CL = 100pF ISINK Output Sink Current 2 — — mA tPD1 tPD2 VREF IREF(SINK) CL(REF) Response Time Response Time Reference Voltage Sink Current Load Capacitance — — 1.176 50 50 — 4 6 1.200 — — — — — 1.221 — — 100 µsec µsec V µA µA pF Voltage Reference IREF(SOURCE) Source Current 2002 Microchip Technology Inc. DS21725B-page 3 © TC1026 2.0 PIN DESCRIPTION The description of the pins are listed in Table 2-1. TABLE 2-1: Pin No. (8-Pin PDIP) (8-Pin MSOP) (8-Pin SOIC) 1 2 3 4 5 6 7 8 PIN FUNCTION TABLE Symbol Description AMPOUT AMPINAMPIN+ VSS CMPIN+ REF(CMPIN) CMPOUT VDD Op amp output. Inverting op amp input. Non-inverting op amp input. Negative power supply. Non-inverting comparator input. Inverting comparator input and voltage reference output voltage. Comparator output. Positive power supply. © DS21725B-page 4 2002 Microchip Technology Inc. TC1026 3.0 DETAILED DESCRIPTION 4.0 TYPICAL APPLICATIONS The TC1026 is one of a series of very low power, linear building block products targeted at low voltage, single supply applications. The TC1026 minimum operating voltage is 1.8V, and typical supply current is only 12µA. It combines a comparator, an op amp and a voltage reference in a single package. The TC1026 lends itself to a wide variety of applications, particularly in battery powered systems. It typically finds application in power management, processor supervisory and interface circuitry. 4.1 External Hysteresis (Comparator) 3.1 Comparator The TC1026 contains one comparator. The comparator’s input range extends beyond both supply voltages by 200mV and the outputs will swing to within several millivolts of the supplies depending on the load current being driven. The inverting input is internally connected to the output of the reference. The comparator exhibits propagation delay and supply current which are largely independent of supply voltage. The low input bias current and offset voltage make it suitable for high impedance precision applications. Hysteresis can be set externally with three resistors using positive feedback techniques (see Figure 4-1). The design procedure for setting external comparator hysteresis is as follows: 1. Choose the feedback resistor RC. Since the input bias current of the comparator is at most 100pA, the current through RC can be set to 100nA (i.e., 1000 times the input bias current) and retain excellent accuracy. The current through RC at the comparator’s trip point is VR / RC where VR is a stable reference voltage. Determine the hysteresis voltage (VHY) between the upper and lower thresholds. Calculate RA as follows: 2. 3. 3.2 Operational Amplifier 4. 5. The amplifier design is such that large signal gain, slew rate and bandwidth are largely independent of supply voltage. The low input bias current and offset voltage of the TC1026 make it suitable for precision applications. Choose the rising threshold voltage for VSRC (VTHR). Calculate RB as follows: EQUATION 4-2: 1 R B = ---------------------------------------------------------V THR 1 1 -------------------- – ------ – ------V R × R A R A RC 6. Verify the formulas: VSRC rising: threshold     3.3 Voltage Reference A 2.0% tolerance, internally biased, 1.20V bandgap voltage reference is included in the TC1026. It has a push-pull output capable of sourcing and sinking at least 50µA. voltages EQUATION 4-3:   1 1 1 V TH R = ( V R ) ( R A ) ------ + ------- + ------RA RB RC VSRC falling:           EQUATION 4-4:     V THF = V THR – R A × V DD -----------------------RC 2002 Microchip Technology Inc.     The TC1026 contains one rail-to-rail op amp. The amplifier’s input range extends beyond both supplies by 200mV and the outputs will swing to within several millivolts of the supplies depending on the load current being driven. EQUATION 4-1: VH Y R A = R C ---------VD D with these DS21725B-page 5 © TC1026 FIGURE 4-1: COMPARATOR EXTERNAL HYSTERESIS CONFIGURATION RC 4.3 Voice Band Receive Filter TC1026 RA VSRC VDD + – VOUT TC1026 Comparator VR RB The majority of spectral energy for human voices is in a 2.7kHz frequency band from 300Hz to 3kHz. To properly recover a voice signal in applications such as radios, cellular phones and voice pagers, a low-power bandpass filter that is matched to the human voice spectrum can be implemented using Microchip’s CMOS op amps. Figure 4-3 shows a unity-gain multipole Butterworth filter with ripple less than 0.15dB in the human voice band. The lower 3dB cut-off frequency is 70Hz (single-order response), while the upper cut-off frequency is 3.5kHz (fourth-order response). 4.4 Supervisory Audio Tone (SAT) Filter for Cellular 4.2 Precision Battery Monitor Figure 4-2 is a precision battery low/battery dead monitoring circuit. Typically, the battery low output warns the user that a battery dead condition is imminent. Battery dead typically initiates a forced shutdown to prevent operation at low internal supply voltages (which can cause unstable system operation). The circuit of Figure 4-2 uses two TC1026 devices and only six external resistors. AMP 1 is a simple buffer while CMPTR1 and CMPTR2 provide precision voltage detection using VR as a reference. Resistors R2 and R4 set the detection threshold for BATT LOW while resistors R1and R3 set the detection threshold for BATT FAIL. The component values shown assert BATT LOW at 2.2V (typical) and BATT FAIL at 2.0V (typical). Total current consumed by this circuit is typically 28µA at 3V. Resistors R5 and R6 provide hysteresis for comparators CMPTR1 and CMPTR2, respectively. Supervisory Audio Tones (SAT) provide a reliable transmission path between cellular subscriber units and base stations. The SAT tone functions much like the current/voltage used in land line telephone systems to indicate that a phone is off the hook. The SAT tone may be one of three frequencies: 5970, 6000 or 6030Hz. A loss of SAT implies that channel conditions are impaired, and if SAT is interrupted for more than 5 seconds, a cellular call is terminated. Figure 4-4 shows a high Q (30) first order SAT detection bandpass filter using Microchip’s CMOS op amp architecture. This circuit nulls all frequencies except the three SAT tones of interest. © DS21725B-page 6 2002 Microchip Technology Inc. TC1026 FIGURE 4-2: PRECISION BATTERY MONITOR To System DC/DC Converter VDD VDD + Op Amp R2, 330k, 1% + CMPTR1 – Comparator BATTLOW R4, 470k, 1% R5, 7.5M AMP1 – 3V Alkaline + TC1026 VDD R1, 270k, 1% VR – CMPTR2 + Comparator BATTFAIL R6, 7.5M R3, 470k, 1% FIGURE 4-3: MULTI-POLE BUTTERWORTH VOICE BAND RECEIVE FILTER Gain = 0dB Fch = 3.5kHz -24dB/Octave Fcl = 70Hz +6dB/Octave Passband Ripple < 0.15dB 750pF 0.1µF 22.6k VDD /2 + – 22.6k VDD Op Amp VOUT TC1026 VIN 21.0k 21.0k 6800pF VDD 21.0k + Op Amp 2400pF 470pF – 2002 Microchip Technology Inc. DS21725B-page 7 © TC1026 FIGURE 4-4: SECOND ORDER SAT BANDPASS FILTER Gain = 0dB Q = 30 Q = FC BW (3dB) FC = 6kHz VDD 24.3k .036µF – VOUT .036µF 48.7k VIN TC1026 + 11.2 VDD/2 VDD/2 Amp. © DS21725B-page 8 2002 Microchip Technology Inc. TC1026 5.0 Note: TYPICAL CHARACTERISTICS The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified operating range (e.g., outside specified power supply range) and therefore outside the warranted range. Comparator Propagation Delay vs. Supply Voltage 7 DELAY TO RISING EDGE (µsec) DELAY TO FALLING EDGE (µsec) Comparator Propagation Delay vs. Supply Voltage 7 6 DELAY TO RISING EDGE (µsec) Comparator Propagation Delay vs. Temperature 7 Overdrive = 100mV 6 TA = 25°C CL = 100pF TA = 25°C CL = 100pF 6 Overdrive = 10mV Overdrive = 10mV 5 4 5 4 Overdrive = 100mV Overdrive = 50mV 5 VDD = 5V VDD = 4V 3 2 1.5 2 2.5 3 Overdrive = 50mV 3 2 4 VDD = 2V VDD = 3V 3 1.5 2 2.5 3 3.5 4 4.5 5 5.5 -40°C 25°C SUPPLY VOLTAGE (V) 3.5 4 4.5 5 5.5 85°C SUPPLY VOLTAGE (V) TEMPERATURE (°C) Comparator Propagation Delay vs. Temperature 7 2.5 Overdrive = 100mV 6 2.0 Comparator Output Swing vs. Output Source Current TA = 25°C Comparator Output Swing vs. Output Sink Current 2.5 2.0 TA = 25°C DELAY TO FALLING EDGE (µsec) VDD - VOUT (V) VDD = 5V 5 VDD = 4V VDD = 3V VDD = 2V 1.5 1.0 VDD = 3V VDD = 1.8V VOUT - VSS (V) 1.5 1.0 VDD = 3V VDD = 1.8V VDD = 5.5V 4 .5 0 0 1 VDD = 5.5V .5 0 3 -40°C 25°C TEMPERATURE (°C) 85°C 3 2 4 ISOURCE (mA) 5 6 0 1 2 3 4 5 6 ISINK (mA) 60 50 40 1.240 TA = -40°C SUPPLY AND REFERENCE VOLTAGES (V) Comparator Output Short-Circuit Current vs. Supply Voltage OUTPUT SHORT-CIRCUIT CURRENT (mA) Reference Voltage vs. Load Current REFERENCE VOLTAGE (V) VDD = 1.8V VDD = 3V VDD = 5.5V Line Transient Response of VREF 4 VDD TA = 25°C TA = 85°C 1.220 1.200 1.180 1.160 VDD = 1.8V 3 Sinking 30 20 Sinking 10 Sourcing 0 0 TA = -4 C 0° Sourcing 2 VREF TA = 25°C TA = 85°C 6 VDD = 5.5V VDD = 3V 1 1.140 0 2 4 0 0 100 200 TIME (µsec) 300 400 3 1 2 4 5 SUPPLY VOLTAGE (V) 6 8 10 LOAD CURRENT (mA) 2002 Microchip Technology Inc. DS21725B-page 9 © TC1026 5.0 TYPICAL CHARACTERISTICS (CONTINUED) Op Amp DC Open-Loop Gain vs. Supply Voltage 140 DC OPEN-LOOP GAIN (dB) 120 100 2000 80 1500 60 40 20 0 0.0 1000 500 0 -40°C 3000 OUTPUT CURRENT (mA) 2500 Op Amp DC Open-Loop Gain vs. Temperature 50 45 40 35 30 25 20 15 10 5 25°C TEMPERATURE (°C) 85°C Op Amp Short-Circuit Current vs. Supply Voltage ISINK 1.0 2.0 3.0 4.0 5.0 6.0 0 0.0 1.0 SUPPLY VOLTAGE (V) 2.0 3.0 4.0 5.0 SUPPLY VOLTAGE (V) 6.0 0 OUTPUT CURRENT (mA) -5 -10 RLOAD (kΩ) 1000 10% Overshoot V V INPUT VOLTAGE (mV) Op Amp Short-Circuit Current vs. Supply Voltage Op Amp Load Resistance vs. Load Capacitance = 1.5V Op Amp Small-Signal Transient Response 100 50 0 100 Region of Marginal Stability -15 -20 -25 -30 -35 0.0 ISRC OUTPUT VOLTAGE (mV) 10 Region of Stable Operation 100 50 0 10 20 30 40 50 60 70 80 90 TIME (µsec) 1 1.0 2.0 3.0 4.0 5.0 SUPPLY VOLTAGE (V) 6.0 0 250 500 750 1000 1250 1500 1750 2000 INPUT VOLTAGE (mV) Op Amp Large-Signal Transient Response 6 4 2 Op Amp Power Supply Rejection Ratio (PSRR) vs. Frequency 0 -10 -20 V V IN = PP PSRR (dB) 0 6 4 2 0 10 20 30 40 50 60 70 80 90 TIME (µsec) -30 -40 -50 -60 -70 100 1K 10K 100K FREQUENCY (Hz) © DS21725B-page 10 2002 Microchip Technology Inc. TC1026 5.0 TYPICAL CHARACTERISTICS (CONTINUED) Reference Voltage vs. Supply Voltage 1.25 REFERENCE VOLTAGE (V) Supply Current vs. Supply Voltage 14 12 10 8 6 4 2 TA = 85°C 1.20 SUPPLY CURRENT (µA) TA = -40°C TA = 25°C 1.15 1.10 1.05 1 4 2 3 SUPPLY VOLTAGE (V) 5 0 1 2 3 4 5 SUPPLY VOLTAGE (V) 6 2002 Microchip Technology Inc. DS21725B-page 11 © TC1026 6.0 6.1 PACKAGING INFORMATION Package Marking Information Package marking data not available at this time. 6.2 Taping Form Component Taping Orientation for 8-Pin MSOP Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin MSOP 12 mm 8 mm 2500 13 in Component Taping Orientation for 8-Pin SOIC (Narrow) Devices User Direction of Feed PIN 1 W P Standard Reel Component Orientation for TR Suffix Device Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) Pitch (P) Part Per Full Reel Reel Size 8-Pin SOIC (N) 12 mm 8 mm 2500 13 in © DS21725B-page 12 2002 Microchip Technology Inc. TC1026 6.3 Package Dimensions 8-Pin Plastic DIP PIN 1 .260 (6.60) .240 (6.10) .045 (1.14) .030 (0.76) .400 (10.16) .348 (8.84) .200 (5.08) .140 (3.56) .150 (3.81) .115 (2.92) .070 (1.78) .040 (1.02) .310 (7.87) .290 (7.37) .040 (1.02) .020 (0.51) .015 (0.38) .008 (0.20) .400 (10.16) .310 (7.87) 3° MIN. .110 (2.79) .090 (2.29) .022 (0.56) .015 (0.38) Dimensions: inches (mm) 8-Pin MSOP PIN 1 .122 (3.10) .114 (2.90) .197 (5.00) .189 (4.80) .026 (0.65) TYP. .122 (3.10) .114 (2.90) .043 (1.10) MAX. .016 (0.40) .010 (0.25) .006 (0.15) .002 (0.05) 6° MAX. .028 (0.70) .016 (0.40) .008 (0.20) .005 (0.13) Dimensions: inches (mm) 2002 Microchip Technology Inc. DS21725B-page 13 © TC1026 6.3 Package Dimensions (Continued) 8-Pin SOIC PIN 1 .157 (3.99) .150 (3.81) .244 (6.20) .228 (5.79) .050 (1.27) TYP. .197 (5.00) .189 (4.80) .069 (1.75) .053 (1.35) .020 (0.51) .010 (0.25) .013 (0.33) .004 (0.10) 8° MAX. . .050 (1.27) .016 (0.40) Dimensions: inches (mm) .010 (0.25) .007 (0.18) © DS21725B-page 14 2002 Microchip Technology Inc. TC1026 Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following: 1. 2. 3. Your local Microchip sales office The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277 The Microchip Worldwide Site (www.microchip.com) Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using. New Customer Notification System Register on our web site (www.microchip.com/cn) to receive the most current information on our products.  2002 Microchip Technology Inc. DS21725B-page15 TC1026 NOTES: DS21725B-page16  2002 Microchip Technology Inc. TC1026 Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, FilterLab, KEELOQ, microID, MPLAB, PIC, PICmicro, PICMASTER, PICSTART, PRO MATE, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. dsPIC, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, MXDEV, PICC, PICDEM, PICDEM.net, rfPIC, Select Mode and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2002, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. Printed on recycled paper. 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Unit 901-6, Tower 2, Metroplaza 223 Hing Fong Road Kwai Fong, N.T., Hong Kong Tel: 852-2401-1200 Fax: 852-2401-3431 Italy Microchip Technology SRL Centro Direzionale Colleoni Palazzo Taurus 1 V. Le Colleoni 1 20041 Agrate Brianza Milan, Italy Tel: 39-039-65791-1 Fax: 39-039-6899883 Toronto 6285 Northam Drive, Suite 108 Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 India Microchip Technology Inc. India Liaison Office Divyasree Chambers 1 Floor, Wing A (A3/A4) No. 11, O’Shaugnessey Road Bangalore, 560 025, India Tel: 91-80-2290061 Fax: 91-80-2290062 United Kingdom Arizona Microchip Technology Ltd. 505 Eskdale Road Winnersh Triangle Wokingham Berkshire, England RG41 5TU Tel: 44 118 921 5869 Fax: 44-118 921-5820 03/01/02 © DS21725B-page 18 2002 Microchip Technology Inc. *B52712SD*