MIC915. Features. General Description. Applications. Ordering Information. Pin Configuration. Pin Description. Dual 135MHz Low-Power Op Amp

Transcription

1 MIC915 Dual 135MHz Low-Power Op Amp General Description The MIC915 is a high-speed, unity-gain stable operational amplifier. It provides a gain-bandwidth product of 135MHz with a very low, 2.4mA supply current per op amp. Supply voltage range is from ±2.5V to ±9V, allowing the MIC915 to be used in low-voltage circuits or applications requiring large dynamic range. The MIC915 is stable driving any capacitative load and achieves excellent PSRR, making it much easier to use than most conventional high-speed devices. Low supply voltage, low power consumption, and small packing make the MIC915 ideal for portable equipment. The ability to drive capacitative loads also makes it possible to drive long coaxial cables. Features 135MHz gain bandwidth product 2.4mA supply current per op amp MSOP-1 package 27V/µs slew rate drives any capacitive load Applications Video Imaging Ultrasound Portable equipment Line drivers Ordering Information Part Number Junction Temp. Range Package MIC915BMM 4 C to MSOP-1 Pin Configuration INA 1 1 V (A)* INA+ 2 9 OUTA V+(A) 3 8 V (B)* INB 4 7 OUTB INB+ 5 6 V+(B) MSOP-1 Pin Description Pin Number Pin Name Pin Function 1 INA Inverting Input A 2 INA+ Noninverting Input A 3 V+(A) Positive Supply Input (Op Amp A) 4 INB Inverting Input B 5 INB+ Noninverting Input B 6 V+(B) Positive Supply Input (Op Amp B) 7 OUTB Output B 8 V (B) Negative Supply Input* (Op Amp B) 9 OUTA Output A 1 V (A) Negative Supply Input* (Op Amp A) * V pins must be externally shorted together, Inc Fortune Drive San Jose, CA USA tel + 1 (48) fax + 1 (48) September 2 1 Rev 8/-A MIC915

2 Absolute Maximum Ratings (Note 1) Supply Voltage (V V+ V V )... 2V Differentail Input Voltage ( V IN+ V IN )... 8V, Note 4 Input Common-Mode Range (V IN+, V IN )... V V+ to V V Lead Temperature (soldering, 5 sec.) C Storage Temperature (T S ) C ESD Rating, Note kV Electrical Characteristics (±5V) Operating Ratings (Note 2) Supply Voltage (V S )... ±2.5V to ±9V Junction Temperature (T J )... 4 C to Package Thermal Resistance C/W V V+ = +5V, V V = 5V, V CM = V, V OUT = V; R L = 1MΩ; T J = 25 C, bold values indicate 4 C T J ; unless noted. Symbol Parameter Condition Min Typ Max Units V OS Input Offset Voltage 1 15 mv V OS Input Offset Voltage 4 µv/ C Temperature Coefficient I B Input Bias Current µa 9 µa I OS Input Offset Current.5 3 µa V CM Input Common-Mode Range CMRR > 6dB V CMRR Common-Mode Rejection Ratio 2.5V < V CM < +2.5V 7 9 db 6 db PSRR Power Supply Rejection Ratio ±5V < V S < ±9V db 7 db A VOL Large-Signal Voltage Gain R L = 2k, V OUT = ±2V 6 71 db R L = 2Ω, V OUT = ±2V 6 71 db V OUT Maximum Output Voltage Swing positive, R L = 2kΩ V +3. V negative, R L = 2kΩ V 3. V positive, R L = 2Ω V V negative, R L = 2Ω V 2.2 V GBW Gain-Bandwidth Product R L = 1kΩ 125 MHz BW 3dB Bandwidth, R L = 1Ω 192 MHz SR Slew Rate 23 V/µs Crosstalk f=1mhz 82 db I GND Short-Circuit Output Current source 72 ma sink 25 ma I Q Supply Current per Op Amp ma 4.1 ma Electrical Characteristics V V+ = +9V, V V = 9V, V CM = V, V OUT = V; R L = 1MΩ; T J = 25 C, bold values indicate 4 C T J ; unless noted Symbol Parameter Condition Min Typ Max Units V OS Input Offset Voltage 1 15 mv V OS Input Offset Voltage 4 µv/ C Temperature Coefficient I B Input Bias Current µa 9 µa MIC915 2 September 2

3 Symbol Parameter Condition Min Typ Max Units I OS Input Offset Current.5 3 µa V CM Input Common-Mode Range CMRR > 6dB V CMRR Common-Mode Rejection Ratio 6.5V < V CM < 6.5V 7 98 db 6 db A VOL Large-Signal Voltage Gain R L = 2kΩ, V OUT = ±6V 6 73 db V OUT Maximum Output Voltage Swing positive, R L = 2kΩ V +6.8 V negative, R L = 2kΩ V 6.8 V GBW Gain-Bandwidth Product R L = 1kΩ 135 MHz SR Slew Rate 27 V/µs Crosstalk f = MHz 82 db I GND Short-Circuit Output Current source 9 ma sink 32 ma I GND Supply Current per Op Amp ma 4.3 ma 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. Devices are ESD sensitive. Handling precautions recommended. Human body model, 1.5k in series with 1pF. Exceeding the maximum differential input voltage will damage the input stage and degrade performance (in particular, input bias current is likely to increase. Test Circuits V CC 1µF Input BNC 5Ω.1µF.1µF V CC R2 5k 1µF Input 1k BNC 1k 1k 5Ω.1µF 5Ω 2k.1µF BNC Output Input BNC R1 5k R7c 2k R7b 2Ω R7a 1Ω All resistors 1% R6 5k R3 2k R4 25Ω R5 5k V EE.1µF.1µF 1µF BNC Output All resistors: 1% metal film V EE 1µF PSRR vs. Frequency R2 R2 + R5 + R4 VOUT = VERROR 1+ + R1 R7 CMRR vs. Frequency September 2 3 Rev 8/-A MIC915

4 1pF V CC R2 4k 1pF 1µF R1 2Ω R5 2Ω R3 27k S1 S2 R4 27k.1µF.1µF BNC To Dynamic Analyzer 1pF 1µF V EE Noise Measurement MIC915 4 September 2

5 Electrical Characteristics 3.5 Supply Current vs. Supply Voltage 4. Supply Current vs. Temperature 2.5 Offset Voltage vs. Temperature SUPPLY (ma) C SUPPLY (ma) OFFSET VOLTAGE (mv) SUPPLY VOLTAGE (±V) TEMPERATURE ( C) TEMPERATURE ( C) BIAS (µa) Bias Current vs. Temperature TEMPERATURE ( C) OFFSET VOLTGE (mv) Offset Voltage vs. Common-Mode Voltage C COMMON-MODE VOLTAGE (V) OFFSET VOLTGE (mv) Offset Voltage vs. Common-Mode Voltage C COMMON-MODE VOLTAGE (V) SUPPLY (ma) Short-Circuit Current vs. Temperature SOURCING TEMPERATURE ( C) SUPPLY (ma) Short-Circuit Current vs. Temperature SINKING TEMPERATURE ( C) OUTPUT (ma) Short-Circuit Current vs. Supply Voltage -4 C 4 SOURCING SUPPLY VOLTAGE (±V) OUTPUT (ma) Short-Circuit Current vs. Supply Voltage -4 C -35 SINKING SUPPLY VOLTAGE (±V) OUTPUT VOLTAGE (V) Output Voltage vs. Output Current C 2 SOURCING OUTPUT (ma) OUTPUT VOLTAGE (V) Output Voltage vs. Output Current SINKING -4 C OUTPUT (ma) September 2 5 Rev 8/-A MIC915

6 OUTPUT VOLTAGE (V) Output Voltage vs. Output Current C 1..5 SOURCING OUTPUT (ma) OUTPUT VOLTAGE (V) Output Voltage vs. Output Current -4 C SINKING OUTPUT (ma) GAIN BANDWIDTH (MHz) Gain Bandwidth and Phase Margin vs. Load CAPACITIVE LOAD (pf) PHASE MARGIN ( ) 15 Gain Bandwidth and Phase Margin vs. Load 46 Gain Bandwidth and Phase Margin vs. Supply Voltage Common-Mode Rejection Ratio GAIN BANDWIDTH (MHz) PHASE MARGIN ( ) GAIN BANDWIDTH (MHz) PHASE MARGIN ( ) CMRR (db) CAPACITIVE LOAD (pf) SUPPLY VOLTAGE (±V) 1x1 2 1x1 3 1x1 4 1x1 5 1x1 6 1x Common-Mode Rejection Ratio 1 Positive Power Supply Rejection Ratio 1 Negative Power Supply Rejection Ratio CMRR (db) PSRR (db) PSRR (db) x1 2 1x1 3 1x1 4 1x1 5 1x1 6 1x1 7 1x1 2 1x1 3 1x1 4 1x1 5 1x1 6 1x1 7 1x1 2 1x1 3 1x1 4 1x1 5 1x1 6 1x1 7 1 Positive Power Supply Rejection Ratio 1 Negative Power Supply Rejection Ratio Cross Talk +PSRR (db) PSRR (db) CROSS TALK (db) x1 2 1x1 3 1x1 4 1x1 5 1x1 6 1x1 7 1x1 2 1x1 3 1x1 4 1x1 5 1x1 6 1x E+5 1E+6 1E+7 1E+8 1E+9 MIC915 6 September 2

7 RF Closed-Loop Frequency Response Test Circuit 5Ω V CC MIC915 1µF.1µF C L FET probe GAIN (db) Closed-Loop Frequency Response V CC = ±2.5V 1pF 5pF 2pF 1pF 5pF p FREQUENCY (MHz) GAIN (db) Open-Loop Frequency Response No Load R L =1Ω FREQUENCY (MHz) PHASE ( ) 1µF V EE GAIN (db) Closed-Loop Frequency Response 1pF 5pF 2pF 1pF 5pF p FREQUENCY (MHz) GAIN (db) Open-Loop Frequency Response No Load R L =1Ω FREQUENCY (MHz) PHASE ( ) 12 Voltage Noise NOISE VOLTAGE nv Hz 25 Positive Slew Rate 25 Negative Slew Rate SLEW RATE (V/µs) SLEW RATE (V/µs) x1 1 1x1 2 1x1 3 1x1 4 1x LOAD CAPACITANCE (pf) LOAD CAPACITANCE (pf) 5 Current Noise 3 Positive Slew Rate 3 Negative Slew Rate NOISE pa Hz SLEW RATE (V/µs) SLEW RATE (V/µs) x1 1 1x1 2 1x1 3 1x1 4 1x LOAD CAPACITANCE (pf) LOAD CAPACITANCE (pf) September 2 7 Rev 8/-A MIC915

8 Small-Signal Small-Signal OUTPUT INPUT C L = 1.7pF R L = 1MΩ OUTPUT INPUT C L = 1.7pF R L = 1MΩ Small-Signal Small-Signal OUTPUT INPUT C L = 1pF R L = 1MΩ OUTPUT INPUT C L = 1pF R L = 1MΩ Small-Signal Small-Signal OUTPUT INPUT C L = 1pF R L = 1MΩ OUTPUT INPUT C L = 1pF R L = 1MΩ MIC915 8 September 2

9 Large-Signal Large-Signal C L = 1.7pF C L = 1.7pF OUTPUT V = 5.64V t = 21ns OUTPUT V = 5.68V t = 24.5ns Large-Signal Large-Signal OUTPUT V = 5.84V t = 22.5ns C L = 1pF C L = 1pF OUTPUT V = 5.84V t = 26ns Large-Signal Large-Signal C L = 1pF OUTPUT V = 5.88V t = 7ns C L = 1pF OUTPUT V = 5.48V t = 95ns September 2 9 Rev 8/-A MIC915

10 Applications Information The MIC915 is a high-speed, voltage-feedback operational amplifier featuring very low supply current and excellent stability. This device is unity gain stable and capable of driving high capacitance loads. Driving High Capacitance The MIC915 is stable when driving any capacitance (see Typical Characteristics: Gain Bandwidth and Phase Margin vs. Load Capacitance ) making it ideal for driving long coaxial cables or other high-capacitance loads. Phase margin remains constant as load capacitance is increased. Most high-speed op amps are only able to drive limited capacitance. Note: increasing load capacitance does reduce the speed of the device (see Typical Characteristics: Gain Bandwidth and Phase Margin vs. Load ). 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 (<1Ω) in series with the output. Feedback Resistor Selection Conventional op amp gain configurations and resistor selection apply, the MIC915 is NOT a current feedback device. Resistor values in the range of 1k to 1k are recommended. Layout Considerations All high speed devices require careful PCB layout. The high stability and high PSRR of the MIC915 make this op amp easier to use than most, but 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. Power Supply Consideration Regular supply bypassing techniques are recommended. A 1µF capacitor in parallel with a.1µf 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. Both V pins must be externally shorted together. Thermal Considerations It is important to ensure the IC does not exceed the maximum operating junction (die) temperature of 85 C. The part can be operated up to the absolute maximum temperature rating of 125 C, but between 85 C and 125 C performance will degrade, in particular CMRR will reduce. A MIC915 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 = P + P D(no load) D(output stage) Ensure the total power dissipated in the device is no greater than the thermal capacity of the package. The MSOP-1 package has a thermal resistance of TBD C/W. Max AllowablePower Dissipation T J(max) T A(max). = W TBD MIC915 1 September 2

11 Package Information 3.15 (.122) 2.85 (.114) 4.9 BSC (.193) DIMENSIONS: MM (INCH) 3.1 (.122) 2.9 (.114) 1.1 (.43).94 (.37).26 (.1).1 (.4).3 (.12).15 (.6).5 BSC (.2).15 (.6).5 (.2) 6 MAX MIN.7 (.28).4 (.16) MSOP-1 September 2 11 Rev 8/-A MIC915

12 MICREL INC FORTUNE DRIVE SAN JOSE, CA USA TEL + 1 (48) FAX + 1 (48) WEB This information is believed to be accurate and reliable, however no responsibility is assumed by 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 Inc. 2 Incorporated MIC September 2