KM4120

www.fairchildsemi.com KM4110/KM4120 0.5mA, Low Cost, +2.7V & +5V, 75MHz Rail-to-Rail Amplifiers Features s s s s s s s s s s s General Description The KM4110 (single) and KM4120 (single with disable) are low cost, voltage feedback amplifiers. These amplifiers are designed to operate on +2.7V, +5V, or ±2.5V supplies. The input voltage range extends 300mV below the negative rail and 1.2V below the positive rail. The KM4110 offers superior dynamic performance with a 75MHz small signal bandwidth and 50V/µs slew rate. The combination of low power, high output current drive, and rail-to-rail performance make the KM4110 well suited for battery-powered communication/ computing systems. The combination of low cost and high performance make the KM4110 suitable for high volume applications in both consumer and industrial applications such as wireless phones, scanners, and color copiers. s 505µA supply current 75MHz bandwidth Power down to Is = 33µA (KM4120) Fully specified at +2.7V and +5V supplies Output voltage range: 0.07V to 4.86V; Vs = +5 Input voltage range: -0.3V to +3.8V; Vs = +5 50V/µs slew rate ±15mA linear output current ±30mA output short circuit current 12nV/√Hz input voltage noise Directly replaces AD8031 in single supply applications Small package options (SOT23-5 and SOT23-6) Applications s s s s s Portable/battery-powered applications A/D buffer Active filters Signal conditioning Portable test instruments Non-Inverting Freq. Response Vs = +5V Normalized Magnitude (1dB/div) 0.1 G=2 Rf = 1kΩ KM4110/KM4120 Packages SOT23-5 (KM4110) Out -Vs +In 1 2 + 5 +Vs - 3 4 -In 1 10 100 Frequency (MHz) SOT23-6 (KM4120) Out -Vs +In 1 2 + 6 5 4 +Vs DIS -In - 3 REV. 1A February 2001 DATA SHEET KM4110/KM4120 KM4110/KM4120 Electrical Characteristics Parameters Case Temperature Frequency Domain Response -3dB bandwidth full power bandwidth gain bandwidth product Time Domain Response rise and fall time settling time to 0.1% overshoot slew rate Distortion and Noise Response 2nd harmonic distortion 3rd harmonic distortion THD input voltage noise DC Performance input offset voltage average drift input bias current average drift input offset current power supply rejection ratio open loop gain quiescent current Disable Characteristics turn on time turn off time off isolation quiescent current Input Characteristics input resistance input capacitance input common mode voltage range common mode rejection ratio Output Characteristics output voltage swing linear output current short circuit output current power supply operating range G = +1, Vo = 0.05Vpp G = +2, Vo < 0.2Vpp G = +2, Vo = 2Vpp 0.2V step 1V step 0.2V step, 2.7V step, G = -1 1Vpp, 1MHz 1Vpp, 1MHz 1Vpp, 1MHz >1MHz Conditions (Vs = +2.7V, G = 2, RL = 1kΩ to Vs/2, Rf = 1kΩ; unless noted) TYP +25°C 65 30 12 28 7.5 60 10 40 67 72 65 12 0 10 1.2 3.5 30 66 98 470 0.54 4.3 58 15 9 1.5 -0.3 to 1.5 98 0.05 to 2.6 0.05 to 2.61 ±15 ±25 2.7 ±5 ±3.5 350 60 65 600 Min & Max +25°C MHz MHz MHz MHz ns ns % V/µs dBc dBc dB nV/√Hz mV µV/°C µA nA/°C nA dB dB µA µs µs dB µA MΩ pF V dB V V mA mA V 2 2 2 2 2 2 1 UNITS NOTES DC 5MHz, RL = 100Ω DC, Vcm = 0V to Vs - 1.5 RL = 10kΩ to Vs/2 RL = 1kΩ to Vs/2 78 2 0.2 to 2.35 2.5 to 5.5 2 Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters. NOTES: 1) For G = +1, Rf = 0. 2) 100% tested at +25°C. Absolute Maximum Ratings supply voltage 0 to +6V maximum junction temperature +175°C storage temperature range -65°C to +150°C lead temperature (10 sec) +300°C operating temperature range (recommended) -40°C to +85°C input voltage range +Vs +0.5V; -Vs -0.5V internal power dissipation see power derating curves Package Thermal Resistance Package 5 lead SOT23 6 lead SOT23 θJA 256°C/W 230°C/W 2 REV. 1A February 2001 KM4110/KM4120 DATA SHEET KM4110/KM4120 Electrical Characteristics PARAMETERS Case Temperature Frequency Domain Response -3dB bandwidth full power bandwidth gain bandwidth product Time Domain Response rise and fall time settling time to 0.1% overshoot slew rate Distortion and Noise Response 2nd harmonic distortion 3rd harmonic distortion THD input voltage noise DC Performance input offset voltage average drift input bias current average drift input offset current power supply rejection ratio open loop gain quiescent current Disable Characteristics turn on time turn off time off isolation quiescent current Input Characteristics input resistance input capacitance input common mode voltage range common mode rejection ratio Output Characteristics output voltage swing linear output current short circuit output current power supply operating range G = +1, Vo = 0.05Vpp G = +2, Vo < 0.2Vpp G = +2, Vo = 2Vpp 0.2V step 2V step 0.2V step, 5V step, G = -1 2Vpp, 1MHz 2Vpp, 1MHz 2Vpp, 1MHz >1MHz CONDITIONS (Vs = +5V, G = 2, RL = 1kΩ to Vs/2, Rf = 1kΩ; unless noted) TYP +25°C 75 35 15 33 6 60 12 50 64 62 60 12 -1 10 1.2 3.5 30 65 80 505 0.33 5.5 58 33 9 1.5 -0.3 to 3.8 92 0.08 to 4.84 0.07 to 4.86 ±15 ±30 5 ±5 ±3.5 350 60 65 620 MIN & MAX UNITS +25°C MHz MHz MHz MHz ns ns % V/µs dBc dBc dB nV/√Hz mV µV/°C µA nA/°C nA dB dB µA µs µs dB µA MΩ pF V dB V V mA mA V 2 2 2 2 2 2 1 NOTES DC 5MHz, RL = 100Ω DC, Vcm = 0V to Vs - 1.5 RL = 10kΩ to Vs/2 RL = 1kΩ to Vs/2 78 2 0.2 to 4.65 2.5 to 5.5 2 Min/max ratings are based on product characterization and simulation. Individual parameters are tested as noted. Outgoing quality levels are determined from tested parameters. NOTES: 1) For G = +1, Rf = 0. 2) 100% tested at +25°C. REV. 1A February 2001 3 DATA SHEET KM4110/KM4120 KM4110/KM4120 Performance Characteristics (Vs = +5V, G = 2, RL = 1kΩ to Vs/2, Rf = 1kΩ; unless noted) Non-Inverting Freq. Response Vs = +5V Normalized Magnitude (1dB/div) G=1 Rf = 0 G=2 Rf = 1kΩ Inverting Freq. Response Vs = +5V Normalized Magnitude (1dB/div) G = -2 Rf = 1kΩ G = 10 Rf = 1kΩ G = -10 Rf = 1kΩ G = -5 Rf = 1kΩ G = -1 Rf = 1kΩ G=5 Rf = 1kΩ 0.1 1 10 100 0.1 1 10 100 Frequency (MHz) Non-Inverting Freq. Response Vs = +2.7V Normalized Magnitude (2dB/div) Normalized Magnitude (1dB/div) G=1 Rf = 0 G=2 Rf = 1kΩ Frequency (MHz) Inverting Freq. Response Vs = +2.7V G = -1 Rf = 1kΩ G = -2 Rf = 1kΩ G = -10 Rf = 1kΩ G = -5 Rf = 1kΩ G = 10 Rf = 2kΩ G=5 Rf = 1kΩ 0.1 1 10 100 0.1 1 10 100 Frequency (MHz) Frequency Response vs. CL CL = 10pF Rs = 0Ω Frequency (MHz) Frequency Response vs. RL RL = 1kΩ Magnitude (1dB/div) CL = 100pF Rs = 100Ω CL = 50pF Rs = 100Ω + 1kΩ 1kΩ Rs CL RL CL = 20pF Rs = 100Ω Magnitude (1dB/div) RL = 10kΩ RL = 100Ω 0.1 1 10 100 0.1 1 10 100 Frequency (MHz) Large Signal Frequency Response Vo = 1Vpp Frequency (MHz) Frequency Response vs. Temperature Magnitude (1dB/div) Vo = 2Vpp Vo = 4Vpp 0.1 Magnitude (1dB/div) 0.01 1 10 100 0.1 1 10 100 Frequency (MHz) Frequency (MHz) 4 REV. 1A February 2001 KM4110/KM4120 DATA SHEET KM4110/KM4120 Performance Characteristics (Vs = +5V, G = 2, RL = 1kΩ to Vs/2, Rf = 1kΩ; unless noted) Open Loop Gain & Phase vs. Frequency 90 80 70 60 50 40 30 20 10 0 -10 100 1k 10k 100k 1M 10M Phase Input Voltage Noise 22 Voltage Noise (nV/√Hz) Open Loop Gain (dB) |Gain| Open Loop Phase (deg) 20 18 16 14 12 10 1k 10k 100k 1M 0 -45 -90 -135 -180 100M Frequency (Hz) 2nd & 3rd Harmonic Distortion; Vs = +5V -20 Vo = 2Vpp Frequency (Hz) 2nd & 3rd Harmonic Distortion; Vs = +2.7V -20 Vo = 1Vpp -30 3rd RL = 1kΩ -30 Distortion (dBc) Distortion (dBc) -40 -50 -60 -70 -80 -90 0 1 3rd RL = 150Ω -40 -50 -60 -70 -80 -90 3rd RL = 150Ω 3rd RL = 1kΩ 2nd RL = 1kΩ 2nd RL = 150Ω 2nd RL = 1kΩ 2nd RL = 150Ω 2 3 4 5 0 1 2 3 4 5 Frequency (MHz) 2nd Harmonic Distortion vs. Vo -20 -30 -20 -30 Frequency (MHz) 3rd Harmonic Distortion vs. Vo Distortion (dBc) -50 -60 -70 500kHz 1MHz Distortion (dB) -40 -40 -50 -60 500kHz -70 -80 1MHz 100kHz -80 100kHz -90 0.5 1 1.5 2 2.5 -90 0.5 1.0 1.5 2.0 2.5 Output Amplitude (Vpp) PSRR 0 -10 -20 -30 -40 -50 -60 -70 -80 100 1k 10k 100k 1M 10M 100M 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 100 1k Output Amplitude (Vpp) CMRR CMRR (dB) PSRR (dB) 10k 100k 1M 10M 100M Frequency (Hz) Frequency (Hz) REV. 1A February 2001 5 DATA SHEET KM4110/KM4120 KM4110/KM4120 Performance Characteristics (Vs = +5V, G = 2, RL = 1kΩ to Vs/2, Rf = 1kΩ; unless noted) Output Current 3 Small Signal Pulse Response Vs = +5V Output Voltage (20mV/div) Output Voltage (0.6V/div) 0 -3 50 0 -50 Time (10ns/div) Output Current (10mA/div) Small Signal Pulse Response Vs = +2.7V Output Voltage (20mV/div) Output Voltage (0.5V/div) Time (10ns/div) Large Signal Pulse Response Vs = +5V Time (10ns/div) Output Swing; Vs = +2.7V; G = -1 2.7 Enable/Disable Response Vin = 0.2Vpp sinusoid Output Voltage (0.02V/div) Output Voltage (0.5V/div) 5V Disable Pulse 0V Output 0 Time (1µs/div) Time (1µs/div) 6 REV. 1A February 2001 KM4110/KM4120 DATA SHEET Magnitude (1dB/div) General Description The KM4110 is a single supply, general purpose, voltage-feedback amplifier fabricated on a complementary bipolar process. The KM4110 offers 75MHz unity gain bandwidth, 50V/µs slew rate, and only 505µA supply current. It features a rail-to-rail output stage and is unity gain stable. The design utilizes a patent pending topology that provides increased slew rate performance. The common mode input range extends to 300mV below ground and to 1.2V below Vs. Exceeding these values will not cause phase reversal. However, if the input voltage exceeds the rails by more than 0.5V, the input ESD devices will begin to conduct. The output will stay at the rail during this overdrive condition. The design uses a Darlington output stage. The output stage is short circuit protected and offers “soft” saturation protection that improves recovery time. The typical circuit schematic is shown in Figure 1. G=2 RL = 1kΩ Rf = 2kΩ Rf = 1kΩ 0.1 1 10 100 Frequency (MHz) Figure 2: Frequency Response vs. Rf Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. If the maximum junction temperature exceeds 150°C, some reliability degradation will occur. If the maximum junction temperature exceeds 175°C for an extended time, device failure may occur. The KM4110 is short circuit protected. However, this may not guarantee that the maximum junction temperature (+150°C) is not exceeded under all conditions. Follow the maximum power derating curves shown in Figure 3 to ensure proper operation. Maximum Power Dissipation (W) 2.0 +Vs 6.8µF + In + Rg 0.01µF Out Rf KM4110 1.5 SOIC-8 lead 1.0 0.5 SOT23-5 lead Figure 1: Typical Configuration For optimum response at a gain of +2, a feedback resistor of 1kΩ is recommended. Figure 2 illustrates the KM4110 frequency response with both 1kΩ and 2kΩ feedback resistors. Enable/Disable Function (KM4120) The KM4120 offers an active-low disable pin that can be used to lower its supply current. Leave the pin floating to enable the part. Pull the disable pin to the negative supply (which is ground in a single supply application) to disable the output. During the disable condition, the nominal supply current will drop to below 30µA and the output will be at high impedance with about 2pF capacitance. 0 -50 -30 -10 10 30 50 70 90 Ambient Temperature ( C) Figure 3: Power Derating Curves Overdrive Recovery For an amplifier, an overdrive condition occurs when the output and/or input ranges are exceeded. The recovery time varies based on whether the input or output is overdriven and by how much the ranges are exceeded. The KM4110 will typically recover in less than 20ns from an overdrive condition. Figure 4 shows the KM4110 in an overdriven condition. REV. 1A February 2001 7 DATA SHEET KM4110/KM4120 G=5 Output Output Voltage (1V/div) Refer to the evaluation board layouts shown in Figure 7 for more information. Evaluation Board Information The following evaluation boards are available to aid in the testing and layout of this device: Eval Board KEB002 Description Products Input Voltage (0.5V/div) Input Single Channel, KM4110IT5, Dual Supply 5 & 6 lead SOT23 KM4120IT6 Time (200ns/div) Evaluation board schematics and layouts are shown in Figure 6 and Figure 7. The KEB002 evaluation board is built for dual supply operation. Follow these steps to use the board in a single supply application: 1. Short -Vs to ground 2. Use C3 and C4, if the -Vs pin of the KM4110 or KM4120 is not directly connected to the ground plane. Figure 4: Overdrive Recovery Driving Capacitive Loads The Frequency Response vs. CL plot on page 4, illustrates the response of the KM4110 and KM4120. A small series resistance (Rs) at the output of the amplifier, illustrated in Figure 5, will improve stability and settling performance. Rs values in the Frequency Response vs. CL plot were chosen to achieve maximum bandwidth with less than 1dB of peaking. For maximum flatness, use a larger Rs. + Rf Rg Rs CL RL Figure 5: Typical Topology for driving a capacitive load Layout Considerations General layout and supply bypassing play major roles in high frequency performance. Fairchild has evaluation boards to use as a guide for high frequency layout and to aid in device testing and characterization. Follow the steps below as a basis for high frequency layout: Include 6.8µF and 0.01µF ceramic capacitors Place the 6.8µF capacitor within 0.75 inches of the power pin s Place the 0.01µF capacitor within 0.1 inches of the power pin s Remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance s Minimize all trace lengths to reduce series inductances s s Figure 6: Evaluation Board Schematic 8 REV. 1A February 2001 KM4110/KM4120 DATA SHEET KM4110/KM4120 Evaluation Board Layout Figure 7a: KEB002 (top side) Figure 7b: KEB002 (bottom side) REV. 1A February 2001 9 DATA SHEET KM4110/KM4120 KM4110/KM4120 Package Dimensions b C L e DATUM ’A’ 2 SOT23-5 C L E C L E1 e1 D C L α C SYMBOL A A1 A2 b C D E E1 L e e1 α MIN 0.90 0.00 0.90 0.25 0.09 2.80 2.60 1.50 0.35 MAX 1.45 0.15 1.30 0.50 0.20 3.10 3.00 1.75 0.55 0.95 ref 1.90 ref 0 10 NOTE: 1. All dimensions are in millimeters. 2 Foot length measured reference to flat foot surface parallel to DATUM ’A’ and lead surface. 3. Package outline exclusive of mold flash & metal burr. 4. Package outline inclusive of solder plating. 5. Comply to EIAJ SC74A. 6. Package ST 0003 REV A supercedes SOT-D-2005 REV C. A A2 A1 b C L e DATUM ’A’ 2 SOT23-6 C L E C L E1 e1 D C L α C SYMBOL A A1 A2 b C D E E1 L e e1 α MIN 0.90 0.00 0.90 0.25 0.09 2.80 2.60 1.50 0.35 MAX 1.45 0.15 1.30 0.50 0.20 3.10 3.00 1.75 0.55 0.95 ref 1.90 ref 0 10 NOTE: 1. All dimensions are in millimeters. 2 Foot length measured reference to flat foot surface parallel to DATUM ’A’ and lead surface. 3. Package outline exclusive of mold flash & metal burr. 4. Package outline inclusive of solder plating. 5. Comply to EIAJ SC74A. 6. Package ST 0004 REV A supercedes SOT-D-2006 REV C. A A2 A1 10 REV. 1A February 2001 KM4110/KM4120 DATA SHEET Ordering Information Model KM4110 KM4110 KM4120 KM4120 Part Number KM4110IT5 KM4110IT5TR3 KM4120IT6 KM4120IT6TR3 Package SOT23-5 SOT23-6 SOT23-6 SOT23-6 Container Partial Rail Reel Partial Rail Reel Pack Qty