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LPV7215 micropower, CMOS Input, RRIO, 1.8V Push-Pull Output Comparator
May 2006
LPV7215 micropower, CMOS Input, RRIO, 1.8V, Push-Pull Output Comparator
General Description
The LPV7215 is an ultra low-power comparator with a typical power supply current of 580 nA. It has the best-in-class power supply current versus propagation delay performance available among National's low-power comparators. The propagation delay is as low as 4.5 microseconds with 100 mV overdrive at 1.8V supply. Designed to operate over a wide range of supply voltages, from 1.8V to 5.5V, with guaranteed operation at 1.8V, 2.7V and 5.0V, the LPV7215 is ideal for use in a variety of batterypowered applications. With rail-to-rail common mode voltage range, the LPV7215 is well suited for single-supply operation. Featuring a push-pull output stage, the LPV7215 allows for operation with absolute minimum power consumption when driving any capacitive or resistive load. Available in a choice of space-saving packages, the LPV7215 is ideal for use in handheld electronics and mobile phone applications. The LPV7215 is manufactured with National's advanced VIP50 process.
Features
(For V+ = 1.8V, typical unless otherwise noted) n Ultra low power consumption 580 nA n Wide supply voltage range 1.8V to 5.5V n Propagation delay 4.5 s n Push-Pull output current drive @ 5V 19 mA n Temperature range -40C to 85C n Rail-to-rail input n Tiny SOT23-5 and SC70-5 packages
Applications
n n n n n RC timers Window detectors IR receiver Multivibrators Alarm and monitoring circuits
Typical Application
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Supply Current vs. Supply Voltage
Propagation Delay vs. Overdrive
(c) 2006 National Semiconductor Corporation
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LPV7215
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance (Note 2) Human Body Model Machine Model VIN Differential Supply Voltage (V - V ) Voltage at Input/Output pins Storage Temperature Range Junction Temperature (Note 3)
+ -
Soldering Information Infrared or Convection (20 sec) Wave Soldering Lead Temp. (10 sec) 235C 260C
2000V 200V
Operating Ratings (Note 1)
Temperature Range (Note 3) Supply Voltage (V+ - V-) Package Thermal Resistance (JA (Note 3)) 5-Pin SOT23 5-Pin SC70 234C/W 456C/W -40C to 85C 1.8V to 5.5V
2.5V
6V V+ +0.3V, V- -0.3V -65C to +150C +150C (Note 8)
1.8V Electrical Characteristics
Symbol IS Parameter Supply Current
Unless otherwise specified, all limits are guaranteed for TJ = 25C, V+ = 1.8V, V- = 0V, and VCM = V+/2, VO= V-. Boldface limits apply at the temperature extremes. Conditions VCM = 0.3V VCM = 1.5V VOS Input Offset Voltage VCM = 0V VCM = 1.8V TCVOS IB IOS CMRR Input Offset Average Drift Input Bias Current (Note 6) Input Offset Current Common Mode Rejection Ratio VCM Stepped from 0V to 0.7V VCM Stepped from 1.2V to 1.8V VCM Stepped from 0V to 1.8V PSRR CMVR AV VO Power Supply Rejection Ratio Input Common-Mode Voltage Range Voltage Gain Output Swing High IO = 500 A IO = 1 mA Output Swing Low IO = -500 A IO = -1 mA IOUT Output Current Source VO = V+/2 Sink VO = V+/2 1.75 1.5 2.35 1.75 1.63 1.60 1.46 1.40 V+ = 1.8V to 5.5V, VCM = 0V CMRR 55 dB 66 65 68 65 56 55 66 63 -0.1 120 1.69 1.60 88 180 2.26 3.1 mA 180 210 310 370 V (Note 7) VCM = 1.6V Min (Note 5) Typ (Note 4) 580 790 Max (Note 5) 750 825 980 1050 Units
nA
0.3 0.4 1
-40 10 88 87 77 82
2.8 3.5 2.2 2.9
mV
V/C fA fA
dB
dB 1.9 V dB
mV
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LPV7215
1.8V Electrical Characteristics
Symbol Parameter Propagation Delay (High to Low) Propagation Delay (Low to High) trise Rise Time
(Note 8)
(Continued)
Unless otherwise specified, all limits are guaranteed for TJ = 25C, V+ = 1.8V, V- = 0V, and VCM = V+/2, VO= V-. Boldface limits apply at the temperature extremes. Conditions Overdrive = 10 mV Overdrive = 100 mV Overdrive = 10 mV Overdrive = 100 mV Overdrive = 10 mV CL = 30 pF, RL = 1 M Overdrive = 100 mV CL = 30 pF, RL = 1 M tfall Fall Time Overdrive = 10 mV CL = 30 pF, RL = 1 M Overdrive = 100 mV CL = 30 pF, RL = 1 M 70 65 Min (Note 5) Typ (Note 4) 13 4.5 12.5 6.6 80 75 9 10.5 s 6.5 8 s Max (Note 5) Units
ns
ns
2.7V Electrical Characteristics
Symbol IS Parameter Supply Current
(Note 8)
Unless otherwise specified, all limits are guaranteed for TJ = 25C, V+ = 2.7V, V- = 0V, and VCM = V+/2, VO= V-. Boldface limits apply at the temperature extremes. Conditions VCM = 0.3V VCM = 2.4V VOS Input Offset Voltage VCM = 0V VCM = 2.7V TCVOS IB IOS CMRR Input Offset Average Drift Input Bias Current (Note 6) Input Offset Current Common Mode Rejection Ratio VCM Stepped from 0V to 1.6V VCM Stepped from 2.1V to 2.7V VCM Stepped from 0V to 2.7V PSRR CMVR AV Power Supply Rejection Ratio Input Common-Mode Voltage Range Voltage Gain V+ = 1.8V to 5.5V, VCM = 0V CMRR 55 dB 72 69 71 66 59 58 66 63 -0.1 120 (Note 7) VCM = 1.8V Min (Note 5) Typ (Note 4) 605 815 Max (Note 5) 780 860 1010 1090 Units
nA
0.3 0.3 1
-40 20 90 94 80 82
2.8 3.5 2.2 2.9
mV
V/C fA fA
dB
dB 2.8 V dB
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LPV7215
2.7V Electrical Characteristics
Symbol VO Parameter Output Swing High
(Note 8)
(Continued)
Unless otherwise specified, all limits are guaranteed for TJ = 25C, V+ = 2.7V, V- = 0V, and VCM = V+/2, VO= V-. Boldface limits apply at the temperature extremes. Conditions IO = 500 A IO = 1 mA Output Swing Low IO = -500 A IO = -1 mA IOUT Output Current Source VO = V+/2 Sink VO = V+/2 Propagation Delay (High to Low) Propagation Delay (Low to High) trise Rise Time Overdrive = 10 mV Overdrive = 100 mV Overdrive = 10 mV Overdrive = 100 mV Overdrive = 10 mV CL = 30 pF, RL = 1 M Overdrive = 100 mV CL = 30 pF, RL = 1 M tfall Fall Time Overdrive = 10 mV CL = 30 pF, RL = 1 M Overdrive = 100 mV CL = 30 pF, RL = 1 M 4.5 3.8 5.6 4 Min (Note 5) 2.57 2.55 2.47 2.43 Typ (Note 4) 2.62 2.53 60 120 5.7 7.5 14.5 5.8 15 7.5 90 85 85 75 ns ns 10 11 8.5 9.5 mA 130 160 250 300 V Max (Note 5) Units
mV
s
5V Electrical Characteristics
Symbol IS Parameter Supply Current
(Note 8)
Unless otherwise specified, all limits are guaranteed for TJ = 25C, V+ = 5V, V- = 0V, and VCM = V+/2, VO= V-. Boldface limits apply at the temperature extremes. Conditions VCM = 0.3V VCM = 4.7V VOS Input Offset Voltage VCM = 0V VCM = 5V TCVOS IB IOS Input Offset Average Drift Input Bias Current (Note 6) Input Offset Current (Note 7) VCM = 4.5V Min (Note 5) Typ (Note 4) 612 825 Max (Note 5) 790 970 1030 1230 Units
nA
0.3
3 3.7 2.3 3.0
mV
1
-400 20
V/C fA fA
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LPV7215
5V Electrical Characteristics
Symbol CMRR Parameter Common Mode Rejection Ratio
(Note 8)
(Continued)
Unless otherwise specified, all limits are guaranteed for TJ = 25C, V+ = 5V, V- = 0V, and VCM = V+/2, VO= V-. Boldface limits apply at the temperature extremes. Conditions VCM Stepped from 0V to 3.9V VCM Stepped from 4.4V to 5V VCM Stepped from 0V to 5V PSRR CMVR AV VO Power Supply Rejection Ratio Input Common-Mode Voltage Range Voltage Gain Output Swing High IO = 500 A IO = 1 mA Output Swing Low IO = -500 A IO = -1 mA IOUT Output Current Source VO = V+/2 Sink VO = V+/2 Propagation Delay (High to Low) Propagation Delay (Low to High) trise Rise Time Overdrive = 10 mV Overdrive = 100 mV Overdrive = 10 mV Overdrive = 100 mV Overdrive = 10 mV CL = 30 pF, RL = 1 M Overdrive = 100 mV CL = 30 pF, RL = 1 M tfall Fall Time Overdrive = 10 mV CL = 30 pF, RL = 1 M Overdrive = 100 mV CL = 30 pF, RL = 1 M 13.0 9.0 14.5 10.5 4.9 4.88 4.82 4.79 V+ = 1.8V to 5.5V, VCM = 0V CMRR 55 dB Min (Note 5) 72 69 73 70 64 63 66 63 -0.1 120 4.94 4.89 43 88 17 19 18 7.7 30 12 100 100 115 95 ns ns 15 17.5 13.5 15 s mA 90 110 170 200 V Typ (Note 4) 98 92 82 82 5.1 Max (Note 5) Units
dB
dB V dB
mV
s
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics Tables. Note 2: Human Body Model is 1.5 k in series with 100 pF. Machine Model is 0 in series with 200 pF. Note 3: The maximum power dissipation is a function of TJ(MAX), JA, and TA. The maximum allowable power dissipation at any ambient temperature is PD = (TJ(MAX) - TA)/ JA . All numbers apply for packages soldered directly onto a PC board at the time of characterization. Note 4: Typical values represent the most likely parametric norm. Note 5: Limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlations using statistical quality control (SQC) method. Note 6: Positive current corresponds to current flowing into the device. Note 7: Offset voltage average drift determined by dividing the change in VOS at temperature extremes into the total temperature change. Note 8: Electrical table values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device.
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LPV7215
Connection Diagram
SC70/SOT23
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Top View
Ordering Information
Package 5-Pin SOT-23 5-Pin SC70 Part Number LPV7215MF LPV7215MFX LPV7215MG LPV7215MGX Package Marking C30A C37 Transport Media 1k Units Tape and Reel 3k Units Tape and Reel 1k Units Tape and Reel 3k Units Tape and Reel NSC Drawing MF05A MAA05A Status Preliminary Released
Simplified Schematic Diagram
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LPV7215
Typical Performance Characteristics
Supply Current vs. Supply Voltage
At TJ = 25C. Unless otherwise specified. Supply Current vs. Common Mode Input
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Supply Current vs. Common Mode Input
Supply Current vs. Common Mode Input
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Sinking Current vs. Supply Voltage
Sourcing Current vs. Supply Voltage
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LPV7215
Typical Performance Characteristics At TJ = 25C. Unless otherwise specified.
Propagation Delay vs. Supply Voltage
(Continued)
Propagation Delay vs. Supply Voltage
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Propagation Delay vs. Overdrive
Propagation Delay vs. Overdrive
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Propagation Delay vs. Overdrive
Propagation Delay vs. Overdrive
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LPV7215
Typical Performance Characteristics At TJ = 25C. Unless otherwise specified.
Propagation Delay vs. Overdrive
(Continued)
Propagation Delay vs. Overdrive
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Propagation Delay vs. Overdrive
Propagation Delay vs. Resistive Load
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IBIAS vs. VCM
IBIAS vs. VCM
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LPV7215
Typical Performance Characteristics At TJ = 25C. Unless otherwise specified.
IBIAS vs. VCM
(Continued)
Propagation Delay vs. Common Mode Input
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Propagation Delay vs. Common Mode Input
Propagation Delay vs. Common Mode Input
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Propagation Delay vs. Common Mode Input
Offset Voltage vs. Common Mode Input
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LPV7215
Application Information
Low supply current and fast propagation delay distinguish the LPV7215 from other low power comparators. INPUT STAGE The LPV7215 has rail-to-rail input common mode voltage range. It can operate at any differential input voltage within this limit as long as the differential voltage is greater than zero. A differential input of zero volts may result in oscillation. The differential input stage of the comparator is a pair of PMOS and NMOS transistors, therefore, no current flows into the device. The input bias current measured is the leakage current in the MOS transistors and input protection diodes. This low bias current allows the comparator to interface with a variety of circuitry and devices with minimal concern about matching the input resistances. The input to the comparator is protected from excessive voltage by internal ESD diodes connected to both supply rails. This protects the circuit from both ESD events, as well as signals that significantly exceed the supply voltages. When this occurs the ESD protection diodes will become forward biased and will draw current into these structures, resulting in no input current to the terminals of the comparator. Until this occurs, there is essentially no input current to the diodes. As a result, placing a large resistor in series with an input that may be exposed to large voltages, will limit the input current but have no other noticeable effect. OUTPUT STAGE The LPV7215 has a MOS push-pull rail-to-rail output stage. The push-pull transistor configuration of the output keeps the total system power consumption to a minimum. The only current consumed by the LPV7215 is the less than 1 A supply current and the current going directly into the load. No power is wasted through the pull-up resistor when the output is low. The output stage is specifically designed with deadtime between the time when one transistor is turned off and the other is turned on (break-before-make) in order to minimize shoot through currents. The internal logic controls the break-before-make timing of the output transistors. The break-before-make delay varies with temperature and power condition. OUTPUT CURRENT Even though the LPV7215 uses less than 1 A supply current, the outputs are able to drive very large currents. The LPV7215 can source up to 17 mA and can sink up to 19 mA, when operated at 5V supply. This large current handling capability allows driving heavy loads directly.
RESPONSE TIME Depending upon the amount of overdrive, the propagation delay will be typically 6 to 30 s. The curves showing propagation delay vs. overdrive in the "Typical Characteristics" section shows the delay time when the input is preset with 100 mV across the inputs and then is driven the other way by 10 mV to 500 mV. The output signal can show a step during switching depending on the load. A fast RC time constant due to both small capacitive and resistive loads will show a significant step in the output signal. A slow RC time constant due to either a large resistive or capacitive load will have a clipped corner on the output signal. The step is observed more prominently during a falling transition from high to low. The plot in Figure 1 shows the output for single 5V supply with a 100 k resistor. The step is at 1.3V.
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FIGURE 1. Output Signal without Cap Load The plot in Figure 2 shows the output signal when a 20 pF capacitor is added as a load. The step is at about 2.5V.
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FIGURE 2. Output Signal with 20 pF Load
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LPV7215
Application Information
CAPACITIVE AND RESISTIVE LOADS
(Continued)
HYSTERESIS In order to improve propagation delay when low overdrive is needed hysteresis can be added. INVERTING COMPARATOR WITH HYSTERESIS The inverting comparator with hysteresis requires a three resistor network that is referenced to the supply voltage V+ of the comparator as shown in Figure 3. When VIN at the inverting input is less than VA, the voltage at the noninverting node of the comparator (VIN < VA), the output voltage is high (for simplicity assume VO switches as high as V+). The three network resistors can be represented as R1//R3 in series with R2. The lower input trip voltage VA1 is defined as VA1 = VCCR2 / ((R1//R3) + R2) When VIN is greater than VA, the output voltage is low or very close to ground. In this case the three network resistors can be presented as R2//R3 in series with R1. The upper trip voltage VA2 is defined as VA2 = VCC (R2//R3) / ((R1+ (R2//R3) The total hysteresis provided by the network is defined as VA = VA1 - VA2
The propagation delay is not affected by capacitive loads at the output of the LPV7215. However, resistive loads slightly effect the propagation delay on the falling edge by a reduction of almost 2 s depending on the load resistance value. NOISE Most comparators have rather low gain. This allows the output to spend time between high and low when the input signal changes slowly. The result is the output may oscillate between high and low when the differential input is near zero. The exceptionally high gain of this comparator, 120 dB, eliminates this problem. Less than 1 V of change on the input will drive the output from one rail to the other rail. If the input signal is noisy, the output cannot ignore the noise unless some hysteresis is provided by positive feedback. (See section on adding hysteresis.) LAYOUT/BYPASS CAPACITORS Proper grounding and the use of a ground plane will help to ensure the specified performance of the LPV7215. Minimizing trace lengths, reducing unwanted parasitic capacitance and using surface-mount components will also help. Comparators are very sensitive to input noise. To minimize supply noise, power supplies should be capacitively decoupled by a 0.01 F ceramic capacitor in parallel with a 10 F electrolytic capacitor.
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FIGURE 3. Inverting Comparator with Hysteresis
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LPV7215
Application Information
(Continued)
ZERO CROSSING DETECTOR In a zero crossing detector circuit, the inverting input is connected to ground and the non-inverting input is connected to a 100 mVPP AC signal. As the signal at the noninverting input crosses 0V, the comparator's output changes state.
NON-INVERTING COMPARATOR WITH HYSTERESIS A non-inverting comparator with hysteresis requires a two resistor network, and a voltage reference (VREF) at the inverting input. When VIN is low, the output is also low. For the output to switch from low to high, VIN must rise up to VIN1 where VIN1 is calculated by.
As soon as VO switches to VCC, VA will step to a value greater than VREF, which is given by
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FIGURE 5. Zero Crossing Detector To improve switching times and centering the input threshold to ground a small amount of positive feedback is added to the circuit. Voltage divider R4 and R5 establishes a reference voltage, V1, at the positive input. By making the series resistance, R1 plus R2 equal to R5, the switching condition, V1 = V2, will be satisfied when VIN = 0. The positive feedback resistor, R6, is made very large with respect to R5 (R6 = 2000 R5). The resultant hysteresis established by this network is very small (V1 < 10 mV) but it is sufficient to insure rapid output voltage transitions. Diode D1 is used to insure that the inverting input terminal of the comparator never goes below approximately -100 mV. As the input terminal goes negative, D1 will forward bias, clamping the node between R1 and R2 to approximately -700 mV. This sets up a voltage divider with R2 and R3 preventing V2 from going below ground. The maximum negative input overdrive is limited by the current handling ability of D1.
To make the comparator switch back to it's low state, VIN must equal VREF before VA will again equal VREF. VIN2 can be calculated by
The hysteresis of this circuit is the difference between VIN1 and VIN2. VIN = VCCR1/R2
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FIGURE 6. Zero Crossing Detector with Positive Feedback
FIGURE 4. Non-Inverting Comparator with Hysteresis
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LPV7215
Application Information
THRESHOLD DETECTOR
(Continued)
Instead of tying the inverting input to 0V, the inverting input can be tied to a reference voltage. As the input on the non-inverting input passes the VREF threshold, the comparator's output changes state. It is important to use a stable reference voltage to ensure a consistent switching point.
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FIGURE 9. IR Receiver SQUARE WAVE GENERATOR A typical application for a comparator is as a square wave oscillator. The circuit in Figure 10 generates a square wave whose period is set by the RC time constant of the capacitor C1 and resistor R4. The maximum frequency is limited by the large signal propagation delay of the comparator and by the capacitive loading at the output, which limits the output slew rate.
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FIGURE 7. Threshold Detector CRYSTAL OSCILLATOR A simple crystal oscillator using the LPV7215 is shown in Figure 8. Resistors R1 and R2 set the bias point at the comparator's non-inverting input. Resistors, R3 and R4 and capacitor C1 set the inverting input node at an appropriate DC average level based on the output. The crystal's path provides resonant positive feedback and stable oscillation occurs. The output duty cycle for this circuit is roughly 50%, but it is affected by resistor tolerances and to a lesser extent by the comparator offset.
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FIGURE 8. Crystal Oscillator IR RECEIVER The LPV7215 can also be used as an infrared receiver. The infrared photo diode creates a current relative to the amount of infrared light present. The current creates a voltage across RD. When this voltage level cross the voltage applied by the voltage divider to the inverting input, the output transitions.
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FIGURE 10. Square Wave Oscillator
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LPV7215
Application Information
(Continued)
Consider the output of Figure 10 to be high to analyze the circuit. That implies that the inverted input (VC) is lower than the non-inverting input (VA). This causes the C1 to be charged through R4, and the voltage VC increases until it is equal to the non-inverting input. The value of VA at this point is
If R1 = R2 = R3 then VA1 = 2VCC/3 At this point the comparator switches pulling down the output to the negative rail. The value of VA at this point is
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If R1 = R2 = R3 then VA2 = VCC/3 The capacitor C1 now discharges through R4, and the voltage VC decreases until it is equal to VA2, at which point the comparator switches again, bringing it back to the initial stage. The time period is equal to twice the time it takes to discharge C1 from 2VCC/3 to VCC/3, which is given by R4C1*ln2. Hence the formula for the frequency is: F = 1/(2*R4*C1*ln2) WINDOW DETECTOR A window detector monitors the input signal to determine if it falls between two voltage levels. The comparator outputs A and B are high only when VREF1 < VIN < VREF2 "or within the window." where these are defined as VREF1 = R3/(R1+R2+R3) * V+ VREF2 = (R2+R3)/(R1+R2+R3) * V+ Others names for window detectors are: threshold detector, level detectors, and amplitude trigger or detector.
FIGURE 11. Window Detector
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FIGURE 12. Window Detector Output Signal
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LPV7215
Physical Dimensions
inches (millimeters) unless otherwise noted
5-Pin SOT23 NS Package Number MF05A
5-Pin SC70 NS Package Number MAA05A
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LPV7215 micropower, CMOS Input, RRIO, 1.8V Push-Pull Output Comparator
Notes
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user. BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ``Banned Substances'' as defined in CSP-9-111S2. Leadfree products are RoHS compliant.
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