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MIC7122
Micrel
MIC7122
Rail-to-Rail Dual Op Amp Preliminary Information
General Description
The MIC7122 is a dual high-performance CMOS operational amplifier featuring rail-to-rail inputs and outputs. The input common-mode range extends beyond the rails by 300mV, and the output voltage swings to within 150V of both rails when driving a 100k load. The amplifiers operate from 2.2V to 15V and are fully specified at 2.2V, 5V, and 15V. Gain bandwidth and slew rate are 750kHz and 0.7V/s, respectively at 2.2V supply. The MIC7122 is available in the MM8TM 8-lead MSOP package.
Features
* * * * * * Small footprint MSOP-8 package 350A supply current per op amp at 2.2V supply Guaranteed 2.2V, 5V, and 15V performance 750kHz gain-bandwidth product at 2.2V supply 0.01% total harmonic distortion at 1kHz (15V, 2k) Drives 200pF at 5V and greater supply voltages
Applications
* Battery-powered instrumentation * PCMCIA, USB peripherals * Portable computers and PDAs
Ordering Information
Part Number MIC7122BMM Temperature Range -40C to +85C Package MSOP-8
Pin Configuration
OUT A 1 IN A- 2 8 7 6 5 V+ OUT B INB- INB+
1 2 A 3 B 4
8 7 6 5
IN A+ 3 V- 4
MSOP-8 (MM)
Pin Description
Pin Number 1/7 2/6 3/5 4 8
MM8 is a trademark of Micrel, Inc. Micrel, Inc. * 1849 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 944-0970 * http://www.micrel.com
Pin Name OUTA / OUTB INA- / INB- INA+ / INB+ V- V+
Pin Function Amplifier Outputs Inverting Inputs Noninverting Inputs Negative Supply: Negative supply for split supply application or ground for single supply applications. Positive Supply
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Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+ - VV-) ........................................ 16.5V Differential Input Voltage (VIN+ - VIN-) ....................... 10V I/O Pin Voltage (VIN, VOUT), Note 3 ............................................. VV+ + 0.3V to VV- - 0.3V Junction Temperature (TJ) ...................................... +150C Storage Temperature ............................... -65C to +150C Lead Temperature (soldering, 10 sec.) ..................... 260C ESD, Note 6 .............................................................. 1000V
Operating Ratings (Note 2)
Supply Voltage (VV+ - VV-) .............................. 2.2V to 15V Junction Temperature (TJ) ......................... -40C to +85C Max. Junction Temperature (TJ(max)), Note 4 ......... +125C Max. Power Dissipation ............................................ Note 4 Package Thermal Resistance, Note 5 MSOP-8 (JA) .................................................... 200C/W
DC Electrical Characteristics (2.2V)
VV+ = +2.2V, VV- = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS IB IOS RIN CMRR PSRR CIN VO Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Power Supply Rejection Ratio Common-Mode Input Capacitance Output Swing output high, RL = 100k, specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Note 8 both amplifiers 20 -0.3V VCM 2.5V, Note 9 VV+ = VV- = 1.1V to 2.5V, VOUT = VCM = 0 45 60 Condition Min Typ 0.5 3.0 1.0 64 0.5 32 >1 65 85 3 0.15 0.15 8 8 26 26 50 0.7 1.6 1 1 1 1 33 50 33 50 110 165 110 165 10 500 5 250 Max 9 Units mV V/C pA pA pA pA T dB dB pF mV mV mV mV mV mV mV mV mV mV mV mV mA mA
AC Electrical Characteristics (2.2V)
VV+ = 2.2V, VV- = 0V, VCM = VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol SR GBW m Gm Parameter Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 200pF Gain Margin Interamplifier Isolation Note 12 Condition Min Typ 0.7 750 80 40 10 90 Max Units V/s kHz dB dB
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DC Electrical Characteristics (5V)
VV+ = +5.0V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS IB IOS RIN CMRR PSRR CIN VOUT Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Power Supply Rejection Ratio Common-Mode Input Capacitance Output Swing output high, RL = 100k specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Note 8 both amplifiers 40 -0.3V VCM 5.3V, Note 9 VV+ = VV- = 2.5V to 7.5V, VOUT = VCM = 0 55 55 Condition Min Typ 0.5 3.0 1.0 64 0.5 32 >1 75 100 3 0.3 0.3 13 13 40 40 140 0.8 1.8 1.0 1.5 1.0 1.5 50 75 50 75 165 250 165 250 10 500 5 250 Max 9 Units mV V/C pA pA pA pA T dB dB pF mV mV mV mV mV mV mV mV mV mV mV mV mA mA
AC Electrical Characteristics (5V)
VV+ = 5V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol THD SR GBW m Gm Parameter Total Harmonic Distortion Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 200pF Gain Margin Interamplifier Isolation Note 12 Condition f = 1kHz, AV = -2, RL = 2k, VOUT = 4.0 VPP Min Typ 0.05 0.6 465 85 40 10 90 Max Units % V/s kHz dB dB
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DC Electrical Characteristics (15V)
VV+ = +15V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol VOS TCVOS IB IOS RIN CMRR PSRR AV Parameter Input Offset Voltage Input Offset Voltage Average Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Power Supply Rejection Ratio Large Signal Voltage Gain -0.3V VCM 15.3V, Note 9 VV+ = VV- = 2.5V to 7.5V, VOUT = VCM = 0 sourcing or sinking, RL = 2k, Note 10 sourcing or sinking, RL = 600, Note 10 CIN VOUT Common-Mode Input Capacitance Output Swing output high, RL = 100k specified as VV+ - VOUT output low, RL = 100k output high, RL = 2k specified as VV+ - VOUT output low, RL = 2k output high, RL = 600 specified as VV+ - VOUT output low, RL = 600 ISC IS Output Short Circuit Current Supply Current sinking or sourcing, Notes 8 both amplifiers 50 60 55 Condition Min Typ 0.5 3.0 1.0 64 0.5 32 >1 85 100 340 300 3 0.8 0.8 40 40 130 130 250 0.9 2.0 2 3 2 3 80 120 80 120 270 400 270 400 10 500 5 250 Max 9 Units mV V/C pA pA pA pA T dB dB V/mV V/mV pF mV mV mV mV mV mV mV mV mV mV mV mV mA mA
AC Electrical Characteristics (15V)
VV+ = 15V, VV- = 0V, VCM = 1.5V, VOUT = VV+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; Note 7; unless noted Symbol THD SR GBW m Gm en in Parameter Total Harmonic Distortion Slew Rate Gain-Bandwidth Product Phase Margin CL = 0pF CL = 500pF Gain Margin Input-Referred Voltage Noise Input-Referred Current Noise Interamplifier Isolation f = 1kHz, VCM = 1V f = 1kHz Note 12 Condition f = 1kHz, AV = -2, RL = 2k, VOUT = 8.5 VPP V+ = 15V, Note 11 Min Typ 0.01 0.5 420 85 40 10 37 1.5 90 Max Units % V/s kHz dB
nV/ Hz fA/ Hz
dB
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Note 1. Note 2. Note 3. Note 4. Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. I/O Pin Voltage is any external voltage to which an input or output is referenced.
Micrel
The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(max); the junction-to-ambient thermal resistance, JA; and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated using: PD = (TJ(max) - TA) / JA. Exceeding the maximum allowable power dissipation will result in excessive die temperature. Thermal resistance, JA, applies to a part soldered on a printed-circuit board. Devices are ESD protected; however, handling precautions are recommended. Human body model, 1.5k in series with 100pF. All limits guaranteed by testing or statistical analysis. Continuous short circuit may exceed absolute maximum TJ under some conditions. CMRR is determined as follows: The maximum VOS over the VCM range is divided by the magnitude of the VCM range. The measurement points are: VCM = VV- - 0.3V, (VV+ - VV-)/2, and VV+ + 0.3V.
Note 5. Note 6. Note 7. Note 8. Note 9.
Note 10. RL connected to 7.5V. Sourcing: 7.5V VOUT 12.5V. Sinking: 2.5V VOUT 7.5V. Note 11. Device connected as a voltage follower with a 10V step input. The value is the positive or negative slew rate, whichever is slower. Note 12. Referenced to input.
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voltage drop (VDROP) and the output (load) current (IOUT). Total on-chip power dissipation is: PD = PS + PO PD = VS IS + VDROP IOUT where: PD = total on-chip power PS = supply power dissipation PO = output power dissipation VS = VV+ - VV- IS = power supply current VDROP = VV+ - VOUT (sourcing current) VDROP = VOUT - VV- (sinking current) The above addresses only steady state (dc) conditions. For non-dc conditions the user must estimate power dissipation based on rms value of the signal. The task is one of determining the allowable on-chip power dissipation for operation at a given ambient temperature and power supply voltage. From this determination, one may calculate the maximum allowable power dissipation and, after subtracting PS, determine the maximum allowable load current, which in turn can be used to determine the miniumum load impedance that may safely be driven. The calculation is summarized below.
PD(max) = TJ(max) - TA JA
Application Information
Input Common-Mode Voltage The MIC7122 tolerates input overdrive by at least 300mV beyond either rail without producing phase inversion. If the absolute maximum input voltage is exceeded, the input current should be limited to 5mA maximum to prevent reducing reliability. A 10k series input resistor, used as a current limiter, will protect the input structure from voltages as large as 50V above the supply or below ground. See Figure 1.
RIN VIN 10k
VOUT
Figure 1. Input Current-Limit Protection Output Voltage Swing Sink and source output resistances of the MIC7122 are equal. Maximum output voltage swing is determined by the load and the approximate output resistance. The output resistance is:
V ROUT = DROP ILOAD
VDROP is the voltage dropped within the amplifier output stage. VDROP and ILOAD can be determined from the VO (output swing) portion of the appropriate Electrical Characteristics table. ILOAD is equal to the typical output high voltage minus V+/2 and divided by RLOAD. For example, using the Electrical Characteristics DC (5V) table, the typical output high voltage drops 13mV using a 2k load (connected to V+/ 2), which produces an ILOAD of: 5.0V - 0.013V - 2.5V = 1.244mA 2k Because of output stage symmetry, the corresponding typical output low voltage (13mV) also equals VDROP. Then: ROUT = 0.013V = 10.5 0.001244A
JA(MSOP-8) = 200C/W Driving Capacitive Loads Driving a capacitive load introduces phase-lag into the output signal, and this in turn reduces op-amp system phase margin. The application that is least forgiving of reduced phase margin is a unity gain amplifier. The MIC7122 can typically drive a 200pF capacitive load connected directly to the output when configured as a unity-gain amplifier and powered with a 2.2V supply. At 15V operation the circuit typically drives 500pF. Using Large-Value Feedback Resistors A large-value feedback resistor (> 500k) can reduce the phase margin of a system. This occurs when the feedback resistor acts in conjunction with input capacitance to create phase lag in the feedback signal. Input capacitance is usually a combination of input circuit components and other parasitic capacitance, such as amplifier input capacitance and stray printed circuit board capacitance. Figure 2 illustrates a method of compensating phase lag caused by using a large-value feedback resistor. Feedback capacitor CFB introduces sufficient phase lead to overcome the phase lag caused by feedback resistor RFB and input
Power Dissipation The MIC7122 output drive capability requires considering power dissipation. If the load impedance is low, it is possible to damage the device by exceeding the 125C junction temperature rating. On-chip power consists of two components: supply power and output stage power. Supply power (PS) is the product of the supply voltage (VS = VV+ - VV-) and supply current (IS). Output stage power (PO) is the product of the output stage
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capacitance CIN. The value of CFB is determined by first estimating CIN and then applying the following formula: RIN x CIN RFB x CFB
CFB RFB RIN VOUT CIN
Micrel
V+ VIN 0V to V+
12
MIC7122 VOUT 0V to V+ VOUT = VIN
VIN
Figure 4. Voltage Follower/Buffer
VS 0.5V to Q1 VCEO(sus)
V+
Figure 2. Cancelling Feedback Phase Lag Since a significant percentage of CIN may be caused by board layout, it is important to note that the correct value of CFB may change when changing from a breadboard to the final circuit layout. Typical Circuits Some single-supply, rail-to-rail applications for which the MIC7122 is well suited are shown in the circuit diagrams of Figures 3 through 7.
V+ VIN
12
VIN 0V to 2V
12
MIC7122
Load
VOUT 0V to V+
IOUT Q1 VCEO = 40V 2N3904 IC(max) = 200mA
{
Change Q1 and RS for higher current and/or different gain.
RS 10 12W
V IOUT = IN = 100mA/V as shown RS
Figure 5. Voltage-Controlled Current Sink
R4
MIC7122 VOUT 0V to V+
0V to
V+ AV
R2 R1 100k 910k
C1 0.001F
100k V+
12
MIC7122 VOUT
V+ 0V
V+
R2 100k R3 100k
R4 100k
Figure 3a. Noninverting Amplifier
100 V+ VOUT (V)
Figure 6. Square Wave Oscillator
CIN R1 33k R2 330k V+
12
A V = 1+
R2 10 R1
MIC7122
COUT RL
VOUT
0V
0
0
VIN (V)
100
V+ R3 330k C1 1F
Figure 3b. Noninverting Amplifier Behavior
= = -10 R4 A V = - R1 33k 330k
R2
330k
Figure 7. AC-Coupled Inverting Amplifier
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Package Information
0.122 (3.10) 0.112 (2.84)
0.199 (5.05) 0.187 (4.74)
DIMENSIONS: INCH (MM)
0.120 (3.05) 0.116 (2.95) 0.036 (0.90) 0.032 (0.81) 0.043 (1.09) 0.038 (0.97) 0.012 (0.30) R
0.007 (0.18) 0.005 (0.13)
0.012 (0.03) 0.0256 (0.65) TYP
0.008 (0.20) 0.004 (0.10)
5 MAX 0 MIN
0.012 (0.03) R 0.039 (0.99) 0.035 (0.89) 0.021 (0.53)
MM8TM 8-Lead MSOP (MM)
MICREL INC. 1849 FORTUNE DRIVE SAN JOSE, CA 95131
TEL
USA
+ 1 (408) 944-0800
FAX
+ 1 (408) 944-0970
WEB
http://www.micrel.com
This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 1999 Micrel Incorporated
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