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MIC7201
Micrel
MIC7201
GainBlockTM Difference Amplifier Preliminary Information
General Description
The MIC7201 difference amplifier is an analog gain block designed to convert a differential signal to a signal-ended signal. It features an extended common-mode range that includes rail-to-rail input/output capabilities. The part is packaged in the SOT-23-5 IttyBittyTM package. The MIC7201 is designed using the MIC7101 operational amplifier plus well-matched monolithic resistors to provide a unity-gain stable differential input to signal-ended output amplifier that requires a minimum of external components. Performance is guaranteed from 2.2V through 10V.
Features
* * * * * * Operates from 2.2V to 10V 1% typical gain error 0.6mA typical supply current at 2.2V 400kHz bandwidth Small SOT-23-5 package Suitable for driving capacitive loads
Applications
* * * * Cellular telephones Digital audio systems Mobile communications Portable computers and PDAs
Ordering Information
Part Number MIC7201BM5 Temperature Range -40C to +85C Package SOT-23-5
Other voltages available. Contact Micrel for details.
Block Diagram
V+
2
IN+
3
50k
100k OUT 100k
1
VIN-
VIN+
IN-
4
50k 50k MIC7201 V-
5
VOUT
Difference Amplifier Behavior
The desired 100mV, 400Hz differential sinusoidal signal is shown applied to inputs VIN- and VIN+. A 500mV, 5kHz square-wave "noise" signal is superimposed on both VIN- and VIN+. These signals demonstrate the noise cancellation ability of the MIC7201. The output (VOUT) shows the recovered single-ended 200mV peak-to-peak, 400Hz sine wave.
GainBlock 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
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MIC7201
MIC7201
Micrel
Pin Configuration
IN+
3
V+ OUT
2 1
Part Identification
A16
4 5
IN-
V-
SOT-23-5
Pin Description
Pin Number 1 2 3 4 5 Pin Name OUT V+ IN+ IN- V- Pin Function Amplifier Output: Single-ended output. Positive Supply: Positive power supply input. Noniverting Input: In-phase differential input. Inverting Input: Out-of-phase differential input. Ground: Power supply ground return.
MIC7201
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MIC7201
Micrel
Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+-VV-) ............................................. 12V Differential Input Voltage (VV+-VV-) ................. (VV+-VV-) I/O Pin Voltage (VIN, VOUT), Note 2 ................................................ VV--0.3V to VV++0.3V Junction Temperature (TJ) ...................................... +150C Storage Temperature (TS) ....................... -65C to +150C Lead Temperature (soldering, 10 sec.) ..................... 260C ESD, Note 5 .................................................................. 2kV
Operating Ratings (Note 1)
Supply Voltage (VV+-VV-) ............................ +2.2V to +10V Input Voltage (VIN+, VIN-) ................................... VV- to VV+ Continuous Output Current ...................................... 15mA Junction Temperature (TJ) ......................... -40C to +85C Max. Junction Temperature (TJ(max)), Note 3 ........... +85C Package Thermal Resistance (JA), Note 4.......... 325C/W Max. Power Dissipation ............................................ Note 3
Electrical Characteristics (2.2V)
VV+ = 2.2V, VV- = 0V, VCM = VOUT = V+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol EZ TCVOS RIN CMRR PSRR +PSRR EG VOUT Parameter Zero Error Input Offset Voltage Temp. Drift Input Resistance Common-mode Rejection Ratio Split-Supply Rejection Ratio Single-Supply Rejection Ratio, Note 8 Gain Error, Note 9 Output Voltage Swing Note 10 VCM = 0V to VV+ VV+ = VV- = 1.1V to 2.5V, VCM = 0V VV+ = 2.2V to 5V, VV- = 0V, VCM = 1.1V 0.2V VOUT 2.0V 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 BW SR THD en IS Output Short-Circuit Current Bandwidth Slew Rate Total Harmonic Distortion Input Referred Voltage Noise Supply Current f = 1kHz f = 10kHz f = 1kHz no load sinking or sourcing, Note 6, Note 7 -3dB point 20 35 Condition EZ = VOUT - VV+/2 Min Typ 9 14 50 65 50 6 1 10 10 33 33 60 400 0.5 0.02 0.02 30 0.6 2.0 33 50 33 50 65 Max 44 Units mV V/C k dB dB dB % mV mV mV mV mV mV mV mV mA kHz V/s % %
nV/ Hz
mA
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MIC7201
Micrel
Electrical Characteristics (5V)
VV+ = +5V, VV- = 0V, VCM = VOUT = V+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol EZ TCVOS RIN CMRR PSRR +PSRR EG VOUT Parameter Zero Error Input Offset Voltage Temp. Drift Input Resistance Common-Mode Rejection Ratio Split-Supply Rejection Ratio Single-Supply Rejection Ratio, Note 8 Gain Error, Note 9 Output Voltage Swing Note 10 VCM = 0V to VV+ VV+ = VV- = 2.5V to 5V, VCM = 0V VV+ = 5V to 10V, VV- = 0V, VCM = 2.5V 0.5V VOUT 4.5V 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 BW SR THD en IS Output Short-Circuit Current Bandwidth Slew Rate Total Harmonic Distortion Input Referred Voltage Noise Supply Current f = 1kHz f = 10kHz f = 1kHz no load sinking or sourcing, Note 6, Note 7 -3dB point 40 35 Condition EZ = VOUT - VV+/2 Min Typ 26 14 50 65 50 6 1 15 15 50 50 110 250 0.5 0.02 0.02 30 0.8 2.8 50 75 50 75 65 Max 100 Units mV V/C k dB dB dB % mV mV mV mV mV mV mV mV mA kHz V/s % %
nV/ Hz
mA
Electrical Characteristics (10V)
VV+ = 10V, VV- = 0V, VCM = VOUT = V+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol EZ TCVOS RIN CMRR PSRR +PSRR EG Parameter Zero Error Input Offset Voltage Temp. Drift Input Resistance Common-Mode Rejection Ratio Split-Supply Rejection Ratio Single-Supply Rejection Ratio, Note 8 Gain Error, Note 9 VCM = 0V to VV+ VV+ = VV- = 2.5V to 5V, VCM = 0V VV+ = 5V to 10V, VV- = 0V, VCM = 2.5V 0.5V VOUT 9.5V 35 Condition EZ = VOUT - VV+/2 Min Typ 60 14 50 65 50 6 1 65 Max 200 Units mV V/C k dB dB dB %
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MIC7201
Symbol VOUT Parameter Output Voltage Swing Note 10 Condition 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 BW SR THD en IS Output Short-Circuit Current Bandwidth Slew Rate Total Harmonic Distortion Input Referred Voltage Noise Supply Current f = 1kHz f = 10kHz f = 1kHz no load sinking or sourcing, Note 6, Note 7 -3dB point 40 Min Typ 24 24 80 80 200 250 0.5 0.02 0.02 30 1.2 4.0 Max 80 120 80 120
Micrel
Units mV mV mV mV mV mV mV mV mA kHz V/s % %
nV/ Hz
mA
Internal Op Amp Typical Characteristics
+2.2V VV+ 10V, VV- = 0V, VCM = VOUT = V+/2; RL = 1M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Symbol VOS TCVOS IB IOS RIN CMRR VCM PSRR Parameter Input Offset Voltage Input Offset Voltage Drift Input Bias Current Input Offset Current Input Resistance Common-Mode Rejection Ratio Input Common-Mode Voltage 0V VCM VV+ input low input high Power Supply Rejection Ratio VV+ = VV- = 1.1V to 1.65V, VCM = 0V Condition Min Typ 0.11 1.0 1.0 0.5 >1 80 -0.3 VV++0.3 60 Max Units mV V/C pA pA T dB V V dB
General Note: Devices are ESD protected; however, handling precautions are recommended. All limits guaranteed by testing or statistical analysis. Note 1: Note 2: Note 3: Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the device outside its recommended operating ratings. I/O pin voltage is any external voltage to which an input or output is referenced. 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. Human body model, 1.5k in series with 100pF. Short circuit may cause the device to exceed maximum allowable power dissipation. See Note 3. Shorting VOUT to V+ when V+ > 10V may damage the device. Limited by internal bias-network resistors. Power supply must be "clean." Power supply should be bypassed as shown in typical application circuit. The gain error specification applies to differential, inverting, and noninverting gains.
Note 4: Note 5: Note 6: Note 7: Note 8: Note 9:
Note 10: Since the part is specified in a single-supply configuration, the output load (RL) is a Thevenin equivalent value. The actual load consists of 2 x RL to ground and 2 x RL to the supply (V+).
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MIC7201
MIC7201
Micrel
VV+ V+
2
Applications Information
Input Common Mode Voltage The MIC7201 tolerates overdriving the inputs 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 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. Output Voltage Swing Output resistance of the MIC7201 is symmetric; sink and source output resistances are equal. Output voltage swing is determined by the load and, given the approximate output resistance, which may be readily calculated with the following formula:
IN+ VIN
3
50k
100k OUT
1
VOUT =
100k IN-
4
VIN 2
50k 50k MIC7201 V-
5
Figure 2. Gain of One-Half
VV+ V+
2
ROUT
VDROP ILOAD
IN+ VIN 50k
3
100k OUT
1
VDROP is the voltage dropped within the amplifier output stage. VDROP and ILOAD can be determined from the VOUT (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 voltage drop using a 2k load (connected to V+/2) is 0.015V, which produces an ILOAD of (2.5V - 0.015V) / 2k 1.243mA. Then: 15mV = 12.1 12 1.243mA Driving Capacitive Loads Driving a capacitive load introduces phase-lag into the output signal, and this in turn reduces system phase margin. The application that is least forgiving of reduced phase margin is a unity gain amplifier. The MIC7201 typically can drive a 500pF capacitive load connected directly to its output. ROUT =
VSUPPLY
VOUT = VIN
100k VV+ IN- 4 2 50k 50k MIC7201 V-
5
Figure 3. Voltage Follower
VV+ V+
2
IN+
3
50k
100k OUT
1
0.1F 100k IN- VIN
4
VOUT = -VIN
50k 50k MIC7201 V-
5
0.1F Digital Input DAC IOUT IOUT 0.1F
4.7F 0.1F MIC7201 RL 0.1F IN+
3
Figure 4. Inverting Unity Gain
VOUT VV+ V+
2
50k
100k OUT
1
0.1F 100k
VOUT =
VV+ 2
Figure 1. Audio DAC
IN-
4
50k 50k MIC7201 V-
5
Figure 5. Virtual Ground Generator MIC7201 6 December 1998
MIC7201
Micrel
Package Information
1.90 (0.075) REF 0.95 (0.037) REF
1.75 (0.069) 1.50 (0.059)
3.00 (0.118) 2.60 (0.102)
DIMENSIONS: MM (INCH) 3.02 (0.119) 2.80 (0.110) 1.30 (0.051) 0.90 (0.035) 10 0 0.15 (0.006) 0.00 (0.000) 0.20 (0.008) 0.09 (0.004)
0.50 (0.020) 0.35 (0.014)
0.60 (0.024) 0.10 (0.004)
SOT-23-5 (M5)
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MIC7201
MIC7201
Micrel
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) 1998 Micrel Incorporated
MIC7201
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December 1998

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