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NCS7101 1.8 Volt Rail-to-Rail Operational Amplifier
The NCS7101 operational amplifier provides rail-to-rail operation on both the input and output. The output can swing within 50 mV of each rail. This rail-to-rail operation enables the user to make full use of the entire supply voltage range available. It is designed to work at very low supply voltages (1.8 V and ground), yet can operate with a supply of up to 10 V and ground. The NCS7101 is available in the space saving SOT-23-5 package with two industry standard pinouts.
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LOW VOLTAGE RAIL-TO-RAIL OPERATIONAL AMPLIFIER
CASE 483 SOT-23-5 SN SUFFIX
* Low Voltage, Single Supply Operation (1.8 V and Ground to 10 V * * * * * * * * * * * * * *
and Ground) 1.0 pA Input Bias Current Unity Gain Bandwidth of 1.0 MHz at 5.0 V, 0.9 MHz at 1.8 V Output Voltage Swings Within 50 mV of Both Rails @ 1.8 V No Phase Reversal on the Output for Over-Driven Input Signals Input Offset Trimmed to 1.0 mV Low Supply Current (ID = 1.0 mA) Works Down to Two Discharged NiCd Battery Cells ESD Protected Inputs Up to 2.0 kV Pb-Free Packages are Available
5 1
MARKING DIAGRAM
= C for SN1 D for SN2 AAx AYWG A = Assembly Location G Y = Year W = Work Week 1 G = Pb-Free Package (Note: Microdot may be in either location) 5 x
PIN CONNECTIONS
VOUT VCC Non-Inverting Input 1 2 3 +- 4 5 VEE Inverting Input
Typical Applications
Dual NiCd/NiMH Cell Powered Systems Portable Communication Devices Low Voltage Active Filters Power Supply Monitor and Control Interface to DSP
Style 1 Pin Out (SN1T1) VOUT VEE Non-Inverting Input 1 2 3 +- 4 5 VCC Inverting Input
Rail to Rail Input
Rail to Rail Output
Style 2 Pin Out (SN2T1) 1.8 V to 10 V + -
ORDERING INFORMATION
Device NCS7101SN1T1 Package SOT-23-5 SOT-23-5 (Pb-Free) 3000 Tape & Reel (7 inch Reel) SOT-23-5 SOT-23-5 (Pb-Free) Shipping
This device contains 68 active transistors.
NCS7101SN1T1G NCS7101SN2T1 NCS7101SN2T1G
Figure 1. Typical Application
For information on tape and reel specifications, including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specifications Brochure, BRD8011/D.
(c) Semiconductor Components Industries, LLC, 2006
1
February, 2006 - Rev. 3
Publication Order Number: NCS7101/D
NCS7101
MAXIMUM RATINGS
Rating Supply Voltage (VCC to VEE) Input Differential Voltage Range (Note 1) Input Common Mode Voltage Range (Note 1) Output Short Circuit Duration (Note 2) Junction Temperature Power Dissipation and Thermal Characteristics SOT-23-5 Package Thermal Resistance, Junction-to-Air Power Dissipation @ TA = 70C Storage Temperature Range ESD Protection at any Pin Human Body Model (Note 3) Symbol VS VIDR VICR tSC TJ Value 10 VEE - 300 mV to 10 V VEE - 300 mV to 10 V Indefinite 150 Unit V V V sec C
RqJA PD Tstg VESD
220 364 -65 to 150 2000
C/W mW C V
1. Either or both inputs should not exceed the range of VEE - 300 mV to VEE + 10 V. 2. Maximum package power dissipation limits must be observed to ensure that the maximum junction temperature is not exceeded. TJ = TA + (PDRqJA) 3. ESD data available upon request.
DC ELECTRICAL CHARACTERISTICS
(VCC = 2.5 V, VEE = -2.5 V, VCM = VO = 0, RL to GND, TA = 25C, unless otherwise noted.) Characteristics Input Offset Voltage VCC = 0.9 V, VEE = -0.9 V TA = 25C TA = -40C to 85C VCC = 2.5 V, VEE = -2.5 V TA = 25C TA = -40C to 85C VCC = 5.0 V, VEE = -5.0 V TA = 25C TA = -40C to 85C Input Offset Voltage Temperature Coefficient (RS = 50) TA = -40C to 105C Input Bias Current (VCC = 1.8 V to 10 V) Common Mode Input Voltage Range Large Signal Voltage Gain VCC = 5.0 V, VEE = -5.0 V RL = 10 kW RL = 2.0 kW Output Voltage Swing, High (VID = "0.2 V) VCC = 0.9 V, VEE = -0.9 V (TA = 25C) RL = 10 k RL = 2.0 k TA = -40C to 85C RL = 10 k RL = 2.0 k VCC = 2.5 V, VEE = -2.5 V (TA = 25C) RL = 600 RL = 2.0 k TA = -40C to 85C RL = 600 RL = 2.0 k VCC = 5.0 V, VEE = -5.0 V (TA = 25C) RL = 600 RL = 2.0 k TA = -40C to 85C RL = 600 RL = 2.0 k Symbol VIO -7.0 -9.0 -7.0 -9.0 -7.0 -9.0 DVIO/DT |IIB| VICR AVOL 16 16 VOH 0.85 0.80 0.85 0.79 2.10 2.35 2.00 2.40 4.40 4.80 4.40 4.80 0.88 0.82 - - 2.21 2.44 - - 4.60 4.88 - - - - - - - - - - - - - - 50 30 - - V - - VEE 0.6 - 0.6 - 0.6 - 8.0 1.0 - 7.0 9.0 7.0 9.0 7.0 9.0 - - VCC mV/C pA V kV/V Min Typ Max Unit mV
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NCS7101
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = 2.5 V, VEE = -2.5 V, VCM = VO = 0, RL to GND, TA = 25C, unless otherwise noted.) Characteristics Output Voltage Swing, Low (VID = "0.2 V) VCC = 0.9 V, VEE = -0.9 V (TA = 25C) RL = 10 k RL = 2.0 k TA = -40C to 85C RL = 10 k RL = 2.0 k VCC = 2.5 V, VEE = -2.5 V (TA = 25C) RL = 600 RL = 2.0 k TA = -40C to 85C RL = 600 RL = 2.0 k VCC = 5.0 V, VEE = -5.0 V (TA = 25C) RL = 600 RL = 2.0 k TA = -40C to 85C RL = 600 RL = 2.0 k Common Mode Rejection Ratio Vin = 0 to 10 V Vin = 0 to 5.0 V Power Supply Rejection Ratio VCC/VEE = 10 V/Ground, DVS = 2.5 V Output Short Circuit Current (Vin Diff = "1.0 V) VCC = +0.9 V, VEE = -0.9 V Source Sink VCC = +2.5 V, VEE = -2.5 V Source Sink VCC = 5.0 V, VEE = -5.0 V Source Sink Power Supply Current (VO = 0 V) VCC = +0.9 V, VEE = -0.9 V TA = 25C TA = -40C to 85C VCC = +2.5 V, VEE = -2.5 V TA = 25C TA = -40C to 85C VCC = 5.0 V, VEE = -5.0 V TA = 25C TA = -40C to 85C Symbol VOL - - - - - - - - - - - - CMRR 65 60 PSRR ISC - - 20 -60 50 -140 ID - - - - - - 0.97 - 1.05 - 1.13 - 1.20 1.30 1.30 1.40 1.40 1.50 3.0 -3.0 25 -25 72 -72 - - 60 -20 140 -50 mA 65 - - - - - - dB mA -0.88 -0.82 - - -2.22 -2.38 - - -4.66 -4.88 - - -0.85 -0.80 -0.85 -0.78 -2.10 -2.35 -2.00 -2.30 -4.40 -4.80 -4.35 -4.80 dB Min Typ Max Unit V
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NCS7101
AC ELECTRICAL CHARACTERISTICS
(VCC = 2.5 V, VEE = -2.5 V, VCM = VO = 0, RL to GND, TA = 25C, unless otherwise noted.) Characteristics Slew Rate (VO = -2.0 to 2.0 V, RL = 2.0 kW, AV = 1.0) Gain Bandwidth Product (VCC = 10 V) Gain Margin (RL = 10 k, CL = 5.0 pF) Phase Margin (RL = 10 k, CL = 5.0 pF) Power Bandwidth (VO = 4.0 Vpp, RL = 2.0 kW, THD v 1.0%) Total Harmonic Distortion (VO = 4.0 Vpp, RL = 2.0 kW, AV = 1.0) f = 1.0 kHz f = 10 kHz Differential Input Resistance (VCM = 0 V) Differential Input Capacitance (VCM = 0 V) Equivalent Input Noise Voltage (Freq = 1.0 kHz) Symbol SR GBW Am m BWP THD - - Rin Cin en - - - 0.02 0.2 u1.0 2.0 140 - - - - - tera W pF nV/Hz Min 0.7 0.5 - - - Typ 1.2 1.0 6.5 60 130 Max 3.0 3.0 - - - Unit V/ms MHz dB Deg kHz %
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NCS7101
Vsat, OUTPUT SATURATION VOLTAGE (mV) Vsat, OUTPUT SATURATION VOLTAGE (V) 0 VCC -400 -800 High State Output Sourcing Current VS = 2.5 V RL = to GND TA = 25C 0 VS = 2.5 V RL = to GND TA = 25C VCC High State Output Sourcing Current
-0.4 -0.8 -1.2
-1200
1200 800 400 VEE 0 100 1.0 k 10 k 100 k 1.0 M RL, LOAD RESISTANCE (W) Low State Output Sinking Current
1.2 0.8 0.4 0 0 2.0 4.0
Low State Output Sinking Current
VEE 6.0 8.0 10 12
IL, LOAD CURRENT (mA)
Figure 2. Output Saturation Voltage versus Load Resistance
Figure 3. Output Saturation Voltage versus Load Current
1000 100 IIB, INPUT CURRENT (pA) 100 AVOL, GAIN (dB) 80 60 40 20 0 0 25 50 75 100 125 1.0 10 100 1.0 k 10 k 100 k 1.0 M TA, AMBIENT TEMPERATURE (C) f, FREQUENCY (Hz) GAIN VS = 5.0 V RL = 100 k TA = 25C
-20 -60
10
PHASE
1.0 VS = 2.5 V RL = CL = 0 AV = 1.0
-100 -140 -180 10 M
0.1
0
Figure 4. Input Bias Current versus Temperature
Figure 5. Gain and Phase versus Frequency
500 mV/div
50 mV/div
VS = 2.5 V VO = 4.0 VPP RL = 10 k CL = 10 pF AV = 1.0 TA = 25C
VS = 2.5 V VO = 4.0 VPP RL = 10 k CL = 10 pF AV = 1.0 TA = 25C t, time (500 ns/Div) t, time (1.0 ms/Div)
Figure 6. Transient Response
Figure 7. Slew Rate http://onsemi.com
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f, EXCESS PHASE ()
0
NCS7101
CMR, COMMON MODE REJECTION (dB) 14 Vout, OUTPUT VOLTAGE (VPP) 12 10 8.0 6.0 4.0 2.0 0 1.0 k 10 k 100 k 1.0 M f, FREQUENCY (Hz) VS = 0.9 V VS = 2.5 V VS = 5.0 V RL = 10 k AV = 1.0 TA = 25C 100 90 80 70 60 50 40 30 20 10 0 -10 10 100 1.0 k 10 k 100 k 1.0 M 10 M f, FREQUENCY (Hz) VS = 2.5 V RL = TA = 25C AV = 1.0
Figure 8. Output Voltage versus Frequency
|ISC|, OUTPUT SHORT CIRCUIT CURRENT (mA)
Figure 9. Common Mode Rejection versus Frequency
140 120 100 -40C 80 60 40 20 0 0 1.0 2.0 3.0 4.0 5.0 85C 25C Output Pulsed Test at 3% Duty Cycle
PSR, POWER SUPPLY REJECTION (dB)
100 90 80 70 60 50 40 30 20 10 0 -10 10 100 1.0 k 10 k 100 k 1.0 M 10 M f, FREQUENCY (Hz) PSR- PSR+ VS = 2.5 V RL = TA = 25C AV = 1.0
VS, SUPPLY VOLTAGE (V)
Figure 10. Power Supply Rejection versus Frequency
|ISC|, OUTPUT SHORT CIRCUIT CURRENT (mA)
Figure 11. Output Short Circuit Sinking Current versus Supply Voltage
140 |ID|, SUPPLY CURRENT (mA) 120 100 80 60 85C 40 20 0 0 1.0 2.0 3.0 4.0 5.0 Output Pulsed Test at 3% Duty Cycle 25C
1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1.0 2.0 3.0 VS, SUPPLY VOLTAGE (V) VS, SUPPLY VOLTAGE (V) RL = AV = 1.0 Vin = 0 V 4.0 5.0 85C 25C -40C
-40C
Figure 12. Output Short Circuit Sourcing Current versus Supply Voltage
Figure 13. Supply Current versus Supply Voltage with No Load
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NCS7101
10 AV = 1000 1.0 AV = 100 0.1 AV = 10 VS = 2.5 V Vout = 4.0 VPP RL = 2 k TA = 25C 100 1.0 k f, FREQUENCY (Hz) 10 k 100 k THD, TOTAL HARMONIC DISTORTION (%) THD, TOTAL HARMONIC DISTORTION (%) 10 AV = 1000
1.0
AV = 100 0.1 AV = 10 0.01 AV = 1.0 0.001 10 100 1.0 k f, FREQUENCY (Hz) 10 k 100 k VS = 5.0 V Vout = 8.0 VPP RL = 2 k TA = 25C
0.01 AV = 1.0 0.001 10
Figure 14. Total Harmonic Distortion versus Frequency with 5.0 V Supply
Figure 15. Total Harmonic Distortion versus Frequency with 10 V Supply
THD, TOTAL HARMONIC DISTORTION (%)
THD, TOTAL HARMONIC DISTORTION (%)
10
1.0
AV = 1000
VS = 2.5 V Vout = 4.0 VPP RL = 10 k TA = 25C
10
1.0
AV = 1000
0.1
AV = 100 AV = 10
0.1
AV = 100 VS = 5.0 V Vout = 8.0 VPP RL = 10 k TA = 25C 100 1.0 k f, FREQUENCY (Hz) 10 k 100 k
0.01 AV = 1.0 0.001 10 100 1.0 k f, FREQUENCY (Hz) 10 k 100 k
0.01
AV = 10
AV = 1.0 0.001 10
Figure 16. Total Harmonic Distortion versus Frequency with 5.0 V Supply
GBW, GAIN BANDWIDTH PRODUCT (MHz)
Figure 17. Total Harmonic Distortion versus Frequency with 10 V Supply
1.6 +Slew Rate, VS = 2.5 V SR, SLEW RATE (V/ms) 1.2 -Slew Rate, VS = 2.5 V 0.8
3.0 VS = 2.5 V RL = 10 k CL = 5.3 pF 2.0
RL = 10 k CL = 10 pF AV = 1.0 TA = 25C
1.0
0.4
+Slew Rate, VS = 0.9 V -Slew Rate, VS = 0.9 V -25 0 25 50 75 100 125
0 -50
0 -50
-25
0
25
50
75
100
125
TA, AMBIENT TEMPERATURE (C)
TA, AMBIENT TEMPERATURE (C)
Figure 18. Slew Rate versus Temperature (Avg.)
Figure 19. Gain Bandwidth Product versus Temperature
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NCS7101
50 40 AV, GAIN (dB) 30 20 10 0 VS = 0.9 V VS = 2.5 V 10 k 100 k 1.0 M 10 M 100 M RL = 10 k AV = 100 TA = 25C 20 -20 -60 -100 -140 -180 -220 -260 -300 f, FREQUENCY (Hz) Am, GAIN MARGIN (dB) , EXCESS PHASE () 80 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 100 Gain Margin 10 0 125 VS = 2.5 V RL = 10 k CL = 10 pF Phase Margin 80 70 60 50 40 30 20 m, PHASE MARGIN ()
-10 -20 -30
TA, AMBIENT TEMPERATURE (C)
Figure 20. Voltage Gain and Phase versus Frequency
Figure 21. Gain and Phase Margin versus Temperature
100 80 Am, GAIN MARGIN (dB) 60 40 20 0 Gain Margin VS = 2.5 V RL = 10 k CL = 5.0 pF TA = 25C 10 100 1.0 k 10 k 100 k Phase Margin
100 m, PHASE MARGIN () 80 60 40 20 0
70 60 AV, GAIN MARGIN (dB) Phase Margin 50 40 30 20 Gain Margin 10 0 1.0 10 100 CL, CAPACITIVE LOAD (pF) VS = 2.5 V RL = 10 k AV = 100 TA = 25C
70 m, PHASE MARGIN () 60 50 40 30 20 10 0 1000
-20 -40
-20 -40 1.0M
Rt, DIFFERENTIAL SOURCE RESISTANCE (W)
Figure 22. Gain and Phase Margin versus Differential Source Resistance
Figure 23. Gain and Phase Margin versus Output Load Capacitance
12 Vout, OUTPUT VOLTAGE (VPP) 10 8.0 6.0 4.0 2.0 0 0 2.0 4.0 6.0 8.0 10 VCC - VEE, SUPPLY VOLTAGE (V) RL = 10 k AV = 100 TA = 25C Split Supplies
80 70 Am, GAIN MARGIN (dB) 60 50 40 30 20 10 0 0 1.0 2.0 3.0 4.0 5.0 VS, SUPPLY VOLTAGE (V) Gain Margin AV = 100 RL = 10 k CL = 0 TA = 25C Phase Margin
Figure 24. Output Voltage Swing versus Supply Voltage
Figure 25. Gain and Phase Margin versus Supply Voltage
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NCS7101
120 VIO, INPUT OFFSET VOLTAGE (mV) AVOL, OPEN LOOP GAIN (dB) 110 100 90 80 70 60 0 1.0 2.0 3.0 4.0 5.0 VS, SUPPLY VOLTAGE (V) RL = 10 k CL = 0 TA = 25C 20 15 10 5 0 -5 -10 -15 -20 -3.0 -2.0 -1.0 0 1.0 2.0 3.0 VS = 2.5 V RL = CL = 0 AV = 1.0 TA = 25C
VCM, COMMON VOLTAGE RANGE (V)
Figure 26. Open Loop Voltage Gain versus Supply Voltage (Split Supplies)
Figure 27. Input Offset Voltage versus Common Mode Input Voltage Range, VS = +2.5 V
20 VIO, INPUT OFFSET VOLTAGE (mV) VCM, COMMON MODE INPUT VOLTAGE RANGE (V) 15 10 5 0 -5 -10 -15 -20 -1.0 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 VS = 0.9 V RL = CL = 0 AV = 1.0 TA = 25C
6.0 4.0 2.0 0 -2.0 -4.0 -6.0 0.5 1.0 DVIO = 5.0 mV RL = CL = 0 AV = 1.0 TA = 25C
2.0
3.0
4.0
5.0
VCM, COMMON MODE INPUT VOLTAGE (V)
VS, SUPPLY VOLTAGE (V)
Figure 28. Input Offset Voltage versus Common Mode Input Voltage Range, VS = +0.9 V
Figure 29. Common-Mode Input Voltage Range versus Power Supply Voltage
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NCS7101
APPLICATION INFORMATION AND OPERATING DESCRIPTION GENERAL INFORMATION The NCS7101 is a rail-to-rail input, rail-to-rail output operational amplifier that features guaranteed 1.8 volt operation. This feature is achieved with the use of a modified analog CMOS process that allows the implementation of depletion MOSFET devices. The amplifier has a 1.0 MHz gain bandwidth product, 1.2 V/ms slew rate and is operational over a power supply range less than 1.8 V to as high as 10 V. Inputs The input topology of this device series is unconventional when compared to most low voltage operational amplifiers. It consists of an N-channel depletion mode differential transistor pair that drives a folded cascode stage and current mirror. This configuration extends the input common mode voltage range to encompass the VEE and VCC power supply rails, even when powered from a combined total of less than 1.8 volts. Figures 27 and 28 show the input common mode voltage range versus power supply voltage. The differential input stage is laser trimmed in order to minimize offset voltage. The N-channel depletion mode MOSFET input stage exhibits an extremely low input bias current of less than 40 pA. The input bias current versus temperature is shown in Figure 4. Either one or both inputs can be biased as low as VEE minus 300 mV to as high as 10 V without causing damage to the device. If the input common mode voltage range is exceeded, the output will not display a phase reversal but it may latch in the appropriate high or low state. The device can then be reset by removing and reapplying power. If the maximum input positive or negative voltage ratings are to be exceeded, a series resistor must be used to limit the input current to less than 2.0 mA. The ultra low input bias current of the NCS7101 allows the use of extremely high value source and feedback resistor without reducing the amplifier's gain accuracy. These high value resistors, in conjunction with the device input and printed circuit board parasitic capacitances Cin, will add an additional pole to the single pole amplifier shown in Figure 30. If low enough in frequency, this additional pole can reduce the phase margin and significantly increase the output settling time. The effects of Cin, can be canceled by placing a zero into the feedback loop. This is accomplished with the addition of capacitor Cfb. An approximate value for Cfb can be calculated by:
Cfb + Rin Cin Rfb
Cfb Rfb Rin Input Cin - +
Output
Cin = Input and printed circuit board capacitance
Figure 30. Input Capacitance Pole Cancellation
Output The output stage consists of complementary P and N channel devices connected to provide rail-to-rail output drive. With a 2.0 k load, the output can swing within 100 mV of either rail. It is also capable of supplying over 95 mA when powered from 10 V and 3.0 mA when powered from 1.8 V. When connected as a unity gain follower, the NCS7101 can directly drive capacitive loads in excess of 390 pF at room temperature without oscillating but with significantly reduced phase margin. The unity gain follower configuration exhibits the highest bandwidth and is most prone to oscillations when driving a high value capacitive load. The capacitive load in combination with the amplifier's output impedance, creates a phase lag that can result in an under-damped pulse response or a continuous oscillation. Figure 32 shows the effect of driving a large capacitive load in a voltage follower type of setup. When driving capacitive loads exceeding 390 pF, it is recommended to place a low value isolation resistor between the output of the op amp and the load, as shown in Figure 31. The series resistor isolates the capacitive load from the output and enhances the phase margin. Refer to Figure 33. Larger values of R will result in a cleaner output waveform but excessively large values will degrade the large signal rise and fall time and reduce the output's amplitude. Depending upon the capacitor characteristics, the isolation resistor value will typically be between 50 to 500 ohms. The output drive capability for resistive and capacitive loads is shown in Figures 2, 3, and 23.
Input + - R Output CL
Isolation resistor R = 50 to 500
Figure 31. Capacitance Load Isolation
Note that the lowest phase margin is observed at cold temperature and low supply voltage.
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NCS7101
Figure 32. Small Signal Transient Response with Large Capacitive Load
Figure 33. Small Signal Transient Response with Large Capacitive Load and Isolation Resistor.
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NCS7101
RT 470 k Output Voltage VCC CT 1.0 nF - + R1a 470 k 0.9 V R1b 470 k R2 470 k fO = 1.5 kHz The non-inverting input threshold levels are set so that the capacitor voltage oscillates between 1/3 and 2/3 of VCC. This requires the resistors R1a, R1b and R2 to be of equal value. The following formula can be used to approximate the output frequency. Timing Capacitor Voltage 0 0.67 VCC 0.33 VCC VCC
1 f+ O 1.39 R TC T Figure 34. Square Wave Oscillator
D1 1N4148 Output Voltage 0 10 k cw D2 1N4148 Timing Capacitor Voltage 0.67 VCC 0.33 VCC Clock-wise, Low Duty Cycle VCC VCC - + fO Timing Capacitor Voltage Output Voltage 0 0.67 VCC 0.33 VCC Counter-Clock-wise, High Duty Cycle R2 470 k The timing capacitor CT will charge through diode D2 and discharge through diode D1, allowing a variable duty cycle. The pulse width of the signal can be programmed by adjusting the value of the trimpot. The capacitor voltage will oscillate between 1/3 and 2/3 of VCC, since all the resistors at the non-inverting input are of equal value.
cww 1.0 M
10 k
VCC
CT 1.0 nF
R1a 470 k VCC R1b 470 k
Figure 35. Variable Duty Cycle Pulse Generator
R1 1.0 M
2.5 V + Cin 10 mF - -2.5 V R3 1.0 k 10,000 mF
R2 1.0 M
R Ceff. + 1 Cin R3
Figure 36. Positive Capacitance Multiplier http://onsemi.com
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NCS7101
Af Cf 400 pF Rf 100 k fL 0.9 V - Vin C1 80 nF + R1 10 k -0.9 V VO fH
R2 10 k
1 f+ [ 200 Hz L 2pR C 11 1 f+ [ 4.0 kHz H 2pRC ff R A + 1 ) f + 11 f R2 Figure 37. Voice Band Filter
Vsupply
VCC Vin + -
I
V in + sink R sense
Rsense
Figure 38. High Compliance Current Sink
VL
Is 5.0 V 1.0 W Rsense R3 1.0 k R4 + - 1.0 k VO R5 2.4 k 0.50 A 78.67 mV Is 1.00 A VO 67.93 mV
RL
R1 1.0 k
R2 3.3 k
For best performance, use low tolerance resistors.
Figure 39. High Side Current Sense
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NCS7101
k R2 VCC k R1 + -
VO
iL +
VS , Note that iL is independent of RL R1
R1 VS R2 RL iL
Figure 40. Current Source
R1 VCC iS - + VO VO = -iS R1
Figure 41. Current to Voltage Converter
VCC i=0 - VS + RL VO iL R1 iR1
iR1 + iL +
V VR1 +S R1 R1
Figure 42. Voltage to Current Converter
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NCS7101
R2 VCC R1 V1 V2 R3 R4 - +
R4 R2 R VO + V2 ) 1 * V1 2 R3 ) R4 R1 R1
VO If R1 = R3, and R2 = R4, the equation simplifies to:
R VO + (V2 * V1) 2 R1
Figure 43. Differential Amplifier
R4 R1 V2 V1 V2 R5 R2 R3 - + VO VCC
V V V VO + * R2 1 ) 2 ) 3 R1 R2 R3
To minimize input offset current take: R5 = R1 // R2 // R3 // R4
Figure 44. Summing Amplifier
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NCS7101
PACKAGE DIMENSIONS
SOT-23-5 / TSOP-5, SC59-5 CASE 483-02 ISSUE E
NOTES: 1. DIMENSIONING AND TOLERANCING PER ANSI Y14.5M, 1982. 2. CONTROLLING DIMENSION: MILLIMETER. 3. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS. MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE MATERIAL. 4. A AND B DIMENSIONS DO NOT INCLUDE MOLD FLASH, PROTRUSIONS, OR GATE BURRS. MILLIMETERS MIN MAX 2.90 3.10 1.30 1.70 0.90 1.10 0.25 0.50 0.85 1.05 0.013 0.100 0.10 0.26 0.20 0.60 1.25 1.55 0_ 10 _ 2.50 3.00 INCHES MIN MAX 0.1142 0.1220 0.0512 0.0669 0.0354 0.0433 0.0098 0.0197 0.0335 0.0413 0.0005 0.0040 0.0040 0.0102 0.0079 0.0236 0.0493 0.0610 0_ 10 _ 0.0985 0.1181
D
5 1 2 4 3
S
B
L G A J C 0.05 (0.002) H K M
DIM A B C D G H J K L M S
SOLDERING FOOTPRINT*
1.9 0.074
0.95 0.037
2.4 0.094 1.0 0.039 0.7 0.028
SCALE 10:1
mm inches
*For additional information on our Pb-Free strategy and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.
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NCS7101/D

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