View MIC921BC5_5014926.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

MIC921
Micrel, Inc.
MIC921
45MHz Low-Power SC-70 Op Amp
General Description
The MIC921 is a high-speed operational amplifier with a gain-bandwidth product of 45MHz. The part is unity gain stable. It has a very low 300A supply current, and features the IttyBittyTM SC-70 and SOT-23-5 package. Supply voltage range is from 2.5V to 9V, allowing the MIC921 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC921 is stable driving any capacitative load and achieves excellent PSRR and CMRR, making it much easier to use than most conventional high-speed devices. Low supply voltage, low power consumption, and small packing make the MIC921 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables.
Features
* * * * * * * * 45MHz gain bandwidth product 61MHz -3dB bandwidth 300A supply current SC-70 or SOT-23-5 packages 3200V/s slew rate Drives any capacitive load 112dB CMRR Unity gain stable
Applications
* * * * * Video Imaging Ultrasound Portable equipment Line drivers
Ordering Information
Part Number Standard MIC921BM5 MIC921BC5 Marking A38 A38 MIC921YC5 A38 Pb-Free Marking Ambient Temperature -40C to +85C -40C to +85C Package SOT-23-5* SC-70-5
* Contact factory for availability of SOT-23-5 package. Note: Underbar marking may not be to scale.
Pin Configuration
3
IN- V- IN+
2
1
Functional Pinout
Part Identification
IN-
3
V- IN+
2
1
A38
4 5
OUT
V+
4
5
OUT
V+
SOT-23-5 or SC-70
SOT-23-5 or SC-70
Pin Description
Pin Number 1 2 3 4 5
IttyBitty is a trademark or Micrel, Inc. Micrel, Inc. * 2180 Fortune Drive * San Jose, CA 95131 * USA * tel + 1 (408) 944-0800 * fax + 1 (408) 474-1000 * http://www.micrel.com
Pin Name IN+ V- IN- OUT V+
Pin Function Noninverting Input Negative Supply (Input) Inverting Input Output: Amplifier Output Positive Supply (Input)
April 2006
1
MIC921
MIC921
Micrel, Inc.
Absolute Maximum Ratings (Note 1)
Supply Voltage (VV+ - VV-) ........................................... 20V Differentail Input Voltage (VIN+ - VIN-) ........... 4V, Note 3 Input Common-Mode Range (VIN+, VIN-) ............VV+ to VV- Lead Temperature (soldering, 5 sec.) ........................ 260C Storage Temperature (TS) ......................................... 150C ESD Rating, Note 4 ................................................... 1.5kV
Operating Ratings (Note 2)
Supply Voltage (VS) .........................................2.5V to 9V Junction Temperature (TJ) .......................... -40C to +85C Package Thermal Resistance SC70-5 .............................................................. 450C/W SOT23-5 ............................................................ 260C/W
Electrical Characteristics (5V)
Symbol VOS VOS IB IOS V+ = +5V, V- = -5V, VCM = 0V, RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted. Parameter Condition Min Input Offset Voltage VOS Temperature Coefficient Input Bias Current Input Offset Current Input Common-Mode Range Common-Mode Rejection Ratio Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing CMRR > 72dB 3.5V < VS < 9V -2.5V < VCM < +2.5V RL = 2k, VOUT = 2V positive, RL = 2k -3.25 75 95 70 +3.0 +1.5 87 105 84 85 3.7 -3.7 3.0 -2.5 37 46 53 1500 45 20 57 40 0.30 12 0.7 0.50 -1.0 -3.0 Typ 0.43 1 0.13 0.06 0.6 0.3 +3.25 Max 5 Units mV V/C A A V dB dB dB dB V V V V MHz MHz V/s mA mA mA nVHz pAHz
VCM
CMRR
PSRR AVOL VOUT
RL = 100, VOUT = 1V negative, RL = 2k
positive, RL = 200 GBW PM BW SR ISC IS Unity Gain-Bandwidth Product Phase Margin -3dB Bandwidth Slew Rate Short-Circuit Output Current Supply Current Input Voltage Noise Input Current Noise AV = 1, CL = 1.7pF
negative, RL = 200, Note 5
C=1.7pF, Gain=1, VOUT=5V, peak to peak, negative SR = 1300V/s source sink No Load f = 10kHz f = 10kHz
AV = 1, RL = 1k, CL = 1.7pF
Electrical Characteristics
Symbol VOS VOS IB V+ = +9V, V- = -9V, VCM = 0V, RL = 10M; TJ = 25C, bold values indicate -40C TJ +85C; unless noted Parameter Condition Min Input Offset Voltage Input Offset Voltage Temperature Coefficient Input Bias Current Input Offset Current Input Common-Mode Range Common-Mode Rejection Ratio CMRR > 75dB -2.5V < VCM < +2.5V -7.25 75 87 Typ 0.4 1 0.13 0.06 0.6 0.3 +7.25 Max 5 Units mV V/C A A V dB
IOS
VCM
CMRR
MIC921
2
April 2006
MIC921
Symbol PSRR AVOL VOUT GBW PM BW SR ISC IS Parameter Power Supply Rejection Ratio Large-Signal Voltage Gain Maximum Output Voltage Swing Unity Gain-Bandwidth Product Phase Margin -3dB Bandwidth Slew Rate Short-Circuit Output Current Supply Current Input Voltage Noise Input Current Noise
Note 1. Note 2. Note 3. Note 4. Note 5.
Micrel, Inc.
Condition 3.5V < VS < 9V RL = 2k, VOUT = 3V positive, RL = 2k Min 95 75 +6.5 Typ 105 86 92 7.6 -7.6 45 40 61 3200 40 25 59 45 0.36 12 0.7 0.6 -6.2 Max Units dB dB dB V V MHz MHz V/s mA mA mA nVHz pAHz
RL = 100, VOUT = 1V negative, RL = 2k
AV = 1, CL = 1.7pF
C=1.7pF, Gain=1, VOUT=5V, peak to peak, negative SR = 2500V/s source sink No Load f = 10kHz f = 10kHz
AV = 1, RL = 1k, CL = 1.7pF
Exceeding the absolute maximum rating may damage the device. The device is not guaranteed to function outside its operating rating. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to change). Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 100pF. Output swing limited by the maximum output sink capability, refer to the short-circuit current vs. temperature graph in "Typical Characteristics."
April 2006
3
MIC921
MIC921
Micrel, Inc.
V+
10F
Test Circuits
Input
BNC
50
0.1F 10k
3
0.1F
V+
R2 5k
10F
2k
5
10k
10k
1
MIC921
2
4
BNC
Output
Input
BNC
R1 5k
R7c 2k R7b 200 R7a 100
3
5
0.1F
4 BNC
1
MIC921
2
Output
50
0.1F
Input
BNC
0.1F
R6 5k R3 200k R4 250 R5 5k
10F
50
0.1F
All resistors 1%
V-
All resistors: 1% metal film
10F
V-
R2 R2 + R 5 + R4 VOUT = VERROR 1 + + R1 R7
PSRR vs. Frequency
CMRR vs. Frequency
100pF
R2 4k
V+
10F
3
V+
10F
10pF
R1 20
R3 27k
S1 S2
5
0.1F
4
3
5
0.1F
4 BNC
1
MIC921
2
R5 20
R4 27k
10pF
0.1F
To Dynamic Analyzer
VIN
1
MIC921
2
300
VOUT FET Probe
0.1F
50
1k
CL
10F
10F
V-
V-
Noise Measurement
Closed Loop Frequency Response Measurement
MIC921
4
April 2006
MIC921
Micrel, Inc.
Typical Characteristics
Offset Voltage vs. Temperature
1 0.95 0.9 0.85 V = 2.5V 0.8 0.75 0.7 V = 5V 0.65 V = 9V 0.6 0.55 0.5 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
0.35 0.30 0.25 0.20 0.15
Supply Current vs. Temperature
V = 9V V = 5V V = 2.5V
0.10 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
0.42 0.40 0.38 0.36 0.34 0.32 0.30 0.28 0.26 0.24 0.22 0.20 2.5
Supply Current vs. Supply Voltage
+85C +25C -40C 3.8 5.1 6.4 7.7 SUPPLY VOLTAGE (V) 9
COMMON-MODE VOLTAGE (V)
-45.0 -40.5 -36.0 -31.5 -27.0 -22.5 -18.0 -13.5 -9.0 -4.5 0
0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0
Output Voltage vs. Output Current (Sinking)
V = 5V
-40C
25C 85C
OUTPUT CURRENT (mA)
0.9 V = 9V 0 -0.9 -1.8 -2.7 25C -3.6 -4.5 85C -40C -5.4 -6.3 -7.2 -8.1 -9.0 -50-45-40-35-30-25-20-15-10 -5 0 OUTPUT CURRENT (mA)
Output Voltage vs. Output Current (Sinking)
5.5 V = 5V 5.0 4.5 4.0 85C 25C 3.5 3.0 2.5 -40C 2.0 1.5 1.0 0.5 0 0 8 16 24 32 40 48 56 64 72 80 OUTPUT CURRENT (mA)
0.5 V = 9V 0 85C -0.5 25C -1.0 -1.5 -40C -2.0 -2.5 -3.0 -3.5 -4.0 -4.5 -5.0 0 8 16 24 32 40 48 56 64 72 80 OUTPUT CURRENT (mA)
Output Voltage vs. Output Current (Sourcing)
7 0 -40C -7 25C -14 -21 -28 -35 85C -42 -49 -56 -63 -70 2.0 3.4 4.8 6.2 7.6 9.0 SUPPLY VOLTAGE (V)
Short Circuit Current vs. Supply Voltage (Sinking)
110 100 90 80 70 60 50 40 30 20 10 0
April 2006
5
-7.40 -5.92 -4.44 -2.96 -1.48 0 1.48 2.96 4.44 5.92 7.40
2.20 2.00 V = 2.5V 1.80 -40C 1.60 1.40 +25C 1.20 1.00 +85C 0.80 0.60 0.40 0.20 0 -900 -540 -180 180 540 900 COMMON-MODE VOLTAGE (V)
Offset Voltage vs. Common-Mode Voltage
-3.4 -2.7 -2.0 -1.4 -0.7 0.0 0.7 1.4 2.0 2.7 3
2.2 2 1.8 1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0
Offset Voltage vs. Common-Mode Voltage
V = 5V -40C
+85C
+25C
2.2 2 1.8 1.6 1.4 1.2 +25C 1 0.8 0.6 0.4 0.2 0
Offset Voltage vs. Common-Mode Voltage
V = 9V -40C
+85C
COMMON-MODE VOLTAGE (V)
Output Voltage vs. Output Current (Sourcing)
Short-Circuit Current vs. Supply Voltage (Sourcing)
-40C
25C 85C
2
3.4 4.8 6.2 7.6 SUPPLY VOLTAGE V) (
9
MIC921
MIC921
Micrel, Inc.
0.18 0.16 0.14 0.12 0.10 0.08 0.06 0.04 0.02
Bias Current vs. Temperature
V = 5V V = 9V
0.00 -40 -20 0 20 40 60 80 100 TEMPERATURE C) (
50 40 30 20 10 0 -10 -20 -30 -40 -50 100k
Closed-Loop Gain vs. Frequency
V = 5V
50pF
1.7pF
100pF
200pF 400pF 600pF 800pF 1000pF
100M 10M 1M FREQUENCY (Hz)
50 40 30 20 10 0 -10 -20 -30 -40 -50 100k
Closed-Loop Gain vs. Frequency
V = 9V
50pF
1.7pF
100pF
200pF 400pF 600pF 800pF 1000pF
100M 10M 1M FREQUENCY (Hz)
50 40 30 20 10 0 -10 -20 -30 -40 -50 100k
Open-Loop Gain y vs. Frequenc
V = 5V
50pF 100pF 1.7pF 200pF 400pF 600pF 1000pF
100M 10M 1M FREQUENCY (Hz)
50 40 30 20 10 0 -10 -20 -30 -40 -50 100k
Open-Loop Gain vs. Frequency
V = 9V
50pF
100pF 1.7pF
200pF 400pF 600pF 1000pF
100M 10M 1M FREQUENCY (Hz)
100 80 V = 5V Phase (100) 60 40 (no load) 20 0 (100) -20 Gain -40 -60 -80 -100 1M 10M 100M 100k FREQUENCY (Hz)
Open-Loop Frequency Response
225 180 135 90 45 0 -45 -90 -135 -180 -225
FREQUENCY (Hz)
2 4 6 8 10 SUPPLY VOLTAGE (V)
45 40 35 30 25 20 15 10 5 0
Gain Bandwidth and Phase Margin vs. Load
V = 9V
60
70 60 50 40 30 20 10 0 10
Voltage Noise Density y vs. Frequenc
2.5 2.0 1.5 1.0 0.5
Phase Margin
40 30 20
Gain Bandwidth
10 0
PHASE MARGIN ()
50
CAPACITIVE LOAD (pF)
100 1000 10000 100000 FREQUENCY (Hz)
MIC921
0 100 200 300 400 500 600 700 800 900 1000
6
0 100 200 300 400 500 600 700 800 900 1000
100 80 V = 9V Phase (100) 60 40 (no load) 20 0 (100) -20 Gain -40 -60 -80 -100
Open-Loop Frequency Response
225 180 135 90 45 0 -45 -90 -135 -180 -225
50 45 40 35 30 25
Gain Bandwidth and Phase Margin vs. Supply Voltage
Phase Margin
40 35 30 25 20 15 10 5 0
Gain Bandwidth and Phase Margin vs. Load
V = 5V
60
PHASE MARGIN ()
50 Phase Margin 40 30 20 Gain Bandwidth 10 0
PHASE ()
Gain Bandwidth
20 0
CAPACITIVE LOAD (pF)
Current Noise Density y vs. Frequenc
0 10
100 1000 10000 100000 FREQUENCY (Hz)
April 2006
PHASE ()
MIC921
Micrel, Inc.
800 700 600 500 400 300 200 100 0 2
Positive Slew Rate vs. Supply Voltage
1600 1400 1200 1000 800 600 400 200 0
Negative Slew Rate vs. Supply Voltage
1400 1200 1000 800 600 400 200
Negative Slew Rate
V = 5V
3 4 5 67 8 POSITIVE VOLTAGE V) (
1600 1400 1200 1000 800 600 400 200 0
Positive Slew Rate
V = 5V
3500 3000 2500 2000 1500 1000 500
Positive Slew Rate
V = 9V
3000 2500 2000 1500 1000 500
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
120 100 80 60 40 20 0 100
Positive Power Supply Rejection Ratio
V = 5V
120 100 80 60 40 20
Negative Power Supply Rejection Ratio
V = 5V
120 100 80 60 40 20
10k 100k 1k FREQUENCY (Hz)
1M
0 100
10k 100k 1k FREQUENCY (Hz)
1M
0 100
120 100 80 60 40 20 0 100
Negative Power Supply Rejection Ratio
V = 9V
10k 100k 1k FREQUENCY (Hz)
1M
100 90 80 70 60 50 40 30 20 10 0 100
Common-Mode Re jection Ratio
V = 5V
1k 10k 100k 1M FREQUENCY (Hz)
10M
100 90 80 70 60 50 40 30 20 10 0 100
Common-Mode Rejection Ratio
V = 9V
April 2006
7
0 100 200 300 400 500 600 700 800 900 1000
0 100 200 300 400 500 600 700 800 900 1000
0 100 200 300 400 500 600 700 800 900 1000
0
0 100 200 300 400 500 600 700 800 900 1000
9
0
12345678 POSITIVE VOLTAGEV) (
9
0
LOAD CAPACITANCE (pF)
Negative Slew Rate
V = 9V
0
LOAD CAPACITANCE (pF)
Positive Power Supply Rejection Ratio
V = 9V
10k 100k 1k FREQUENCY (Hz)
1M
1k 10k 100k 1M FREQUENCY (Hz)
10M
MIC921
MIC921
Micrel, Inc.
Functional Characteristics
Small Signal Reponse
V = 5V Av = 1 CL = 1.7pF INPUT (50mV/div) INPUT (50mV/div) V = 9V Av = 1 CL = 1.7pF
Small Signal Reponse
OUTPUT (50mV/div)
TIME (100ns/div)
OUTPUT (50mV/div)
TIME (100ns/div)
Small Signal Reponse
V = 5V Av = 1 CL = 100pF INPUT (50mV/div) INPUT (50mV/div) V = 9V Av = 1 CL = 100pF
Small Signal Reponse
OUTPUT (50mV/div)
TIME (500ns/div)
OUTPUT (50mV/div)
TIME (500ns/div)
Small Signal Reponse
V = 5V Av = 1 CL = 1000pF INPUT (50mV/div) INPUT (50mV/div) V = 9V Av = 1 CL = 1000pF
Small Signal Reponse
OUTPUT (50mV/div)
OUTPUT (50mV/div)
TIME (1s/div)
TIME (1s/div)
MIC921
8
April 2006
MIC921
Micrel, Inc.
Large Signal Response
V = 5V Av = 1 CL = 1.7pF
Large Signal Response
V = 9V Av = 1 CL = 1.7pF
OUTPUT (2V/div)
OUTPUT (2V/div) Positive Slew Rate = 1520V/s Negative Slew Rate = 1312V/s TIME (25ns/div) Positive Slew Rate = 3230V/s Negative Slew Rate = 2950V/s
TIME (25ns/div)
Large Signal Response
V = 5V Av = 1 CL = 100pF
Large Signal Response
V = 9V Av = 1 CL = 100pF
OUTPUT (2V/div)
Positive Slew Rate = 349V/s Negative Slew Rate = 181V/s
OUTPUT (2V/div) Positive Slew Rate = 615V/s Negative Slew Rate = 447V/s TIME (25ns/div) TIME (50ns/div)
Large Signal Response
V = 5V Av = 1 CL = 1000pF
Large Signal Response
V = 9V Av = 1 CL = 1000pF
OUTPUT (2V/div)
Positive Slew Rate = 63V/s Negative Slew Rate = 44V/s TIME (250ns/div)
OUTPUT (2V/div)
Positive Slew Rate = 85V/s Negative Slew Rate = 57V/s TIME (250ns/div)
April 2006
9
MIC921
MIC921
Micrel, Inc. Power Supply Bypassing Regular supply bypassing techniques are recommended. A 10F capacitor in parallel with a 0.1F capacitor on both the positive and negative supplies are ideal. For best performance all bypassing capacitors should be located as close to the op amp as possible and all capacitors should be low ESL (equivalent series inductance), ESR (equivalent series resistance). Surface-mount ceramic capacitors are ideal. Thermal Considerations The SC70-5 package, like all small packages, has a high thermal resistance. It is important to ensure the IC does not exceed the maximum operating junction (die) temperature of 85C. The part can be operated up to the absolute maximum temperature rating of 125C, but between 85C and 125C performance will degrade, in particular CMRR will reduce. An MIC921 with no load, dissipates power equal to the quiescent supply current * supply voltage PD(no load) = VV+ - VV- IS When a load is added, the additional power is dissipated in the output stage of the op amp. The power dissipated in the device is a function of supply voltage, output voltage and output current. PD(output stage) = VV+ - VOUT IOUT Total Power Dissipation = PD(no load) + PD(output stage) Ensure the total power dissipated in the device is no greater than the thermal capacity of the package. The SC70-5 package has a thermal resistance of 450C/W. TJ(max) - TA(max) Max. Allowable Power Dissipation = 450C/W
Applications Information
The MIC921 is a high-speed, voltage-feedback operational amplifier featuring very low supply current and excellent stability. This device is unity gain stable, capable of driving high capacitance loads. Driving High Capacitance The MIC921 is stable when driving high capacitance, making it ideal for driving long coaxial cables or other high-capacitance loads. Most high-speed op amps are only able to drive limited capacitance. Note: increasing load capacitance does reduce the speed of the device. In applications where the load capacitance reduces the speed of the op amp to an unacceptable level, the effect of the load capacitance can be reduced by adding a small resistor (<100) in series with the output. Feedback Resistor Selection Conventional op amp gain configurations and resistor selection apply, the MIC921 is NOT a current feedback device. Also, for minimum peaking, the feedback resistor should have low parasitic capacitance, usually 470 is ideal. To use the part as a follower, the output should be connected to input via a short wire. Layout Considerations All high speed devices require careful PCB layout. The following guidelines should be observed: Capacitance, particularly on the two inputs pins will degrade performance; avoid large copper traces to the inputs. Keep the output signal away from the inputs and use a ground plane. It is important to ensure adequate supply bypassing capacitors are located close to the device.
(
)
(
)
MIC921
10
April 2006
MIC921
Micrel, Inc.
Package Information
SOT-23-5 (M5)
SC-70 (C5) MICREL INC.
TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB http://www.micrel.com
2180 FORTUNE DRIVE
SAN JOSE, CA 95131
USA
This information furnished by Micrel in this data sheet is believed to be accurate and reliable. However no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser's use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser's own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. (c) 2001 Micrel, Inc.
April 2006
11
MIC921

▲Up To Search▲

Price & Availability of MIC921BC5

	To Download MIC921BC5 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .