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| www.fairchildsemi.com KM4270 Dual, Low Cost, +2.7V & +5V, Rail-to-Rail I/O Amplifier Features at 2.7V I I I I I I I I I 136A supply current per amplifier 4.9MHz bandwidth Output swings to within 20mV of either rail Input voltage range exceeds the rail by >250mV 5.3V/s slew rate 16mA output current 21nV/Hz input voltage noise Directly replaces MAX4126, OPA2340, LMV822, and TLV2462 in single supply applications Available in SOIC-8 and MSOP-8 package options General Description The KM4270 is an ultra-low cost, low power, voltage feedback amplifier. At 5V, the KM4270 uses only 160A of supply current per amplifier and is designed to operate from a supply range of 2.5V to 5.5V (1.25V to 2.75V). The input voltage range exceeds the negative and positive rails. The KM4270 offers high bipolar performance at a low CMOS price. The KM4270 offers superior dynamic performance with a 4.9MHz small signal bandwidth and 5.3V/s slew rate. The combination of low power, high bandwidth, and rail-to-rail performance make the KM4270 well suited for battery-powered communication/computing systems. The KM4170 (single) and KM4470 (quad) are also available. Large Signal Frequency Response Vs = 5V Applications I I I I I I I I I KM4270 Packages SOIC Out1 -In1 +In1 -Vs 1 2 3 4 + Magnitude (1dB/div) Portable/battery-powered applications PCMCIA, USB Mobile communications, cellular phones, pagers Notebooks and PDA's Sensor Interface A/D buffer Active filters Signal conditioning Portable test instruments Vo = 1Vpp Vo = 4Vpp Vo = 2Vpp 8 7 + +Vs Out2 -In2 +In2 Output Swing vs. Load 1.35 RL = 10k 0.01 0.1 1 10 Frequency (MHz) 6 5 Output Voltage (0.27V/div) MSOP Out1 -In1 +In1 -Vs 1 2 3 4 + RL = 1k 8 7 + +Vs Out2 -In2 +In2 0 RL = 75 RL = 100 RL = 200 RL = 75/100 6 5 -1.35 -2.0 0 2.0 Input Voltage (0.4V/div) REV. 1A May 2001 DATA SHEET KM4270 KM4270 Electrical Characteristics Parameters Case Temperature Frequency Domain Response -3dB bandwidth full power bandwidth gain bandwidth product Time Domain Response rise and fall time 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 power supply rejection ratio open loop gain quiescent current per channel Input Characteristics input resistance input capacitance input common mode voltage range common mode rejection ratio Output Characteristics output voltage swing output current power supply operating range Conditions (Vs = +2.7V, G = 2, RL = 10k to Vs/2, Rf = 5k; unless noted) TYP +25C Min & Max +25C MHz MHz MHz MHz ns % V/s dBc dBc % nV/Hz 6 420 55 190 mV V/C nA pA/C dB dB A M pF V dB V V V mA V 2 2 2 2 1 UNITS NOTES G = +1, Vo = 0.02Vpp G = +2, Vo = 0.2Vpp G = +2, Vo = 2Vpp 1V step 1V step 1V step 1Vpp, 10kHz 1Vpp, 10kHz 1Vpp, 10kHz >10kHz 4.9 3.7 1.4 2.2 163 <1 5.3 -72 -72 0.03 21 0.5 5 90 32 83 90 136 12 2 -0.25 to 2.95 81 DC RL = 10k DC, Vcm = 0V to Vs RL = 10k to Vs/2 RL = 1k to Vs/2 RL = 200 to Vs/2 55 2 2 0.02 to 2.68 0.06 to 2.64 0.05 to 2.63 0.11 to 2.52 16 2.7 2.5 to 5.5 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 +25C. Absolute Maximum Ratings supply voltage 0 to +6V maximum junction temperature +175C storage temperature range -65C to +150C lead temperature (10 sec) +260C operating temperature range (recommended) -40C to +85C input voltage range +Vs + 0.5V, -Vs - 0.5V Package Thermal Resistance Package 8 lead SOIC 8 lead MSOP JA 152C/W 206C/W 2 REV. 1A May 2001 KM4270 DATA SHEET KM4270 Electrical Characteristics Parameters Case Temperature Frequency Domain Response -3dB bandwidth full power bandwidth gain bandwidth product Time Domain Response rise and fall time 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 power supply rejection ratio open loop gain quiescent current per channel Input Characteristics input resistance input capacitance input common mode voltage range common mode rejection ratio Output Characteristics output voltage swing output current power supply operating range Conditions (Vs = +5V, G = 2, RL = 10k to Vs/2, Rf = 5k; unless noted) TYP +25C Min & Max +25C MHz MHz MHz MHz ns % V/s dBc dBc % nV/Hz mV V/C nA pA/C dB dB A M pF V dB V V V mA V 1 UNITS NOTES G = +1, Vo = 0.02Vpp G = +2, Vo = 0.2Vpp G = +2, Vo = 2Vpp 1V step 1V step 1V step 2Vpp, 10kHz 2Vpp, 10kHz 2Vpp, 10kHz >10kHz 4.3 3.0 2.3 2.0 110 <1 9 -73 -75 0.03 22 1.5 15 90 40 60 80 160 12 2 -0.25 to 5.25 85 0.04 to 4.96 0.07 to 4.9 0.14 to 4.67 30 5.0 DC RL = 10k DC, Vcm = 0V to Vs RL = 10k to Vs/2 RL = 1k to Vs/2 RL = 200 to Vs/2 2.5 to 5.5 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. REV. 1A May 2001 3 DATA SHEET KM4270 KM4270 Performance Characteristics (Vs = +2.7, G = 2, RL = 10k to Vs/2, Rf = 5k; unless noted) Non-Inverting Freq. Response Vs = +5V Normalized Magnitude (1dB/div) Vo = 0.2Vpp G=2 Rf = 5k G=1 Rf = 0 Inverting Frequency Response Vs = +5V Normalized Magnitude (1dB/div) Vo = 0.2Vpp G = -2 Rf = 5k G = -1 Rf = 5k G = 10 Rf = 5k G=5 Rf = 5k G = -10 Rf = 5k G = -5 Rf = 5k 0.01 0.1 1 10 0.01 0.1 1 10 Frequency (MHz) Non-Inverting Freq. Response Vs = +2.7V Normalized Magnitude (1dB/div) Vo = 0.2Vpp G=2 Rf = 5k Frequency (MHz) Inverting Frequency Response Vs = +2.7V Normalized Magnitude (1dB/div) Rf = 5k G = -2 G = -1 G=1 Rf = 0 G = 10 Rf = 5k G=5 Rf = 5k G = -10 G = -5 0.01 0.1 1 10 0.01 0.1 1 10 Frequency (MHz) Frequency Response vs. CL Vo = 0.05V CL = 100pF Rs = 100 CL = 50pF Rs = 0 Frequency (MHz) Frequency Response vs. RL Magnitude (1dB/div) Magnitude (1dB/div) RL = 1k RL = 10k CL = 20pF Rs = 0 CL = 10pF Rs = 0 + 5k 5k Rs CL RL RL = 200 RL = 50 0.01 0.1 1 10 0.01 0.1 1 10 Frequency (MHz) Large Signal Frequency Response 140 Vs = 5V Frequency (MHz) Open Loop Gain & Phase vs. Frequency 120 |Gain| RL = 10k |Gain| No load Vs = 5V Open Loop Phase (deg) Open Loop Gain (dB) Magnitude (1dB/div) Vo = 1Vpp 100 80 60 40 20 0 -20 100 Phase RL = 10k Phase No load 0 -45 -90 -135 -180 101 102 103 104 105 106 107 108 Vo = 4Vpp Vo = 2Vpp 0.01 0.1 1 10 Frequency (MHz) Frequency (Hz) 4 REV. 1A May 2001 KM4270 DATA SHEET KM4270 Performance Characteristics (Vs = +2.7V, G = 2, RL = 10k to Vs/2, Rf = 5k; unless noted) 2nd & 3rd Harmonic Distortion; Vs = +2.7V -20 Vo = 1Vpp 2nd Harmonic Distortion vs. Vo -20 -30 -30 Distortion (dBc) -50 -60 -70 -80 -90 0 20 40 60 2nd RL = 10k 3rd RL = 10k Distortion (dB) -40 2nd RL = 200 3rd RL = 1k 3rd RL = 200 -40 -50 50kHz -60 50kHz 100kHz -70 -80 -90 10kHz, 20kHz 10kHz 2nd RL = 1k 80 100 0.5 1 1.5 2 2.5 Frequency (kHz) 3rd Harmonic Distortion vs. Vo -20 -30 50kHz Output Amplitude (Vpp) CMRR 0 -10 -20 Distortion (dB) -40 -50 -60 -70 10kHz CMRR (dB) 1 -30 -40 -50 -60 -70 -80 -90 100kHz 20kHz -80 -90 0.5 1.5 2 2.5 10 100 1000 10000 100000 Output Amplitude (Vpp) PSRR 0 -10 -20 1.35 Frequency (Hz) Output Swing vs. Load RL = 10k Output Voltage (0.27V/div) RL = 1k PSRR (dB) -30 -40 -50 -60 -70 -80 -90 10 100 1000 10000 100000 0 RL = 75 RL = 100 RL = 200 RL = 75/100 -1.35 -2.0 0 2.0 Frequency (Hz) Pulse Resp. vs. Common Mode Voltage 55 Input Voltage (0.4V/div) Input Voltage Noise 50 Output Voltage (0.5V/div) 1.2V offset 0.6V offset No offset -0.6V offset -1.2V offset 45 40 35 30 25 20 15 10 5 0 nV/Hz Time (1s/div) 0.1k 1k 10k 100k 1M Frequency (Hz) REV. 1A May 2001 5 DATA SHEET KM4270 General Description The KM4270 is single supply, general purpose, voltagefeedback amplifier. The KM4270 is fabricated on a complimentary bipolar process, features a rail-to-rail input and output, and is unity gain stable. The typical non-inverting circuit schematic is shown in Figure 1. Overdrive Recovery Overdrive of an amplifier 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 KM4270 will typically recover in less than 50ns from an overdrive condition. Figure 3 shows the KM4270 in an overdriven condition. G=5 +Vs + Input Voltage (0.5V/div) 6.8F Output Input In + Rg 0.01F Out Rf KM4270 Time (10s/div) Figure 3: Overdrive Recovery Driving Capacitive Loads The Frequency Response vs. CL plot, illustrates the response of the KM4270. A small series resistance (Rs) at the output of the amplifier, illustrated in Figure 4, will improve stability and settling performance. Rs values in the Frequency Response vs. CL plot were chosen to achieve maximum bandwidth with less than 2dB of peaking. For maximum flatness, use a larger Rs. As the plot indicates, the KM4270 can easily drive a 50pF capacitive load without a series resistance. Figure 1: Typical Non-inverting Configuration Input Common Mode Voltage The common mode input range extends to 250mV below ground and to 250mV above Vs, in single supply operation. 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. If the absolute maximum input voltage (700mV beyond either rail) is exceeded, externally limit the input current to 5mA as shown in Figure 2. + Rf Rg Rs CL RL Vin 10k KM4270 Vo + Figure 4: Typical Topology for driving a capacitive load Driving a capacitive load introduces phase-lag into the output signal, which reduces phase margin in the amplifier. The unity gain follower is the most sensitive configuration. In a unity gain follower configuration, the KM4270 requires a 510 series resistor to drive a 100pF load. Figure 2: Circuit for Input Current Protection Power Dissipation The maximum internal power dissipation allowed is directly related to the maximum junction temperature. If the maximum junction temperature exceeds 150C, some performance degradation will occur. It the maximum junction temperature exceeds 175C for an extended time, device failure may occur. 6 REV. 1A May 2001 KM4270 DATA SHEET 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 as aid in device testing and characterization. Follow the steps below as a basis for high frequency layout: * Include 6.8F and 0.01F ceramic capacitors * Place the 6.8F capacitor within 0.75 inches of the power pin * Place the 0.01F capacitor within 0.1 inches of the power pin * Remove the ground plane under and around the part, especially near the input and output pins to reduce parasitic capacitance * Minimize all trace lengths to reduce series inductances Refer to the evaluation board layouts shown in Figure 6 for more information. Evaluation Board Information The following evaluation boards are available to aid in the testing and layout of this device: Eval Board KEB006 KEB010 Description Dual Channel, Dual Supply, 8 lead SOIC Dual Channel, Dual Supply, 8 lead MSOP Products KM4270IC8 KM4270IM8 Figure 5: Evaluation Board Schematic Evaluation board schematics and layouts are shown in Figure 5 and Figure 6. REV. 1A May 2001 7 DATA SHEET KM4270 KM4270 Evaluation Board Layout Figure 6a: KEB006 (top side) Figure 6b: KEB006 (bottom side) Figure 6c: KEB010 (top side) Figure 6d: KEB010 (bottom side) 8 REV. 1A May 2001 KM4270 DATA SHEET KM4270 Package Dimensions SOIC-8 D e ZD C L 7 SYMBOL A1 B C D E e H h L A ZD A2 L MIN MAX 0.10 0.25 0.36 0.46 0.19 0.25 4.80 4.98 3.81 3.99 1.27 BSC 5.80 6.20 0.25 0.50 0.41 1.27 1.52 1.72 8 0 0.53 ref 1.37 1.57 SOIC C L E H Pin No. 1 B DETAIL-A h x 45 NOTE: DETAIL-A 1. All dimensions are in millimeters. 2. Lead coplanarity should be 0 to 0.10mm (.004") max. 3. Package surface finishing: (2.1) Top: matte (charmilles #18~30). (2.2) All sides: matte (charmilles #18~30). (2.3) Bottom: smooth or matte (charmilles #18~30). 4. All dimensions excluding mold flashes and end flash from the package body shall not exceed o.152mm (.006) per side(d). A A1 A2 C e S 02 MSOP-8 t1 SYMBOL MIN A 1.10 A1 0.10 A2 0.86 D 3.00 D2 2.95 E 4.90 E1 3.00 E2 2.95 E3 0.51 E4 0.51 R 0.15 R1 0.15 t1 0.31 t2 0.41 b 0.33 b1 0.30 c 0.18 c1 0.15 01 3.0 02 12.0 03 12.0 L 0.55 L1 0.95 BSC aaa 0.10 bbb 0.08 ccc 0.25 e 0.65 BSC S 0.525 BSC MAX - 0.05 0.08 0.10 0.10 0.15 0.10 0.10 0.13 0.13 +0.15/-0.06 +0.15/-0.06 0.08 0.08 +0.07/-0.08 0.05 0.05 +0.03/-0.02 3.0 3.0 3.0 0.15 - - - - - - MSOP E/2 2X -H- R1 t2 R Gauge Plane E1 3 7 0.25mm -B- 2 03 b L1 c1 b1 Section A - A 5 L 01 E3 E4 1 2 2 4 6 ccc A B C c D2 A2 -C- Detail A Scale 40:1 Detail A E2 A b aaa A bbb M A B C -A- A A E1 E A1 D 3 4 NOTE: 1 All dimensions are in millimeters (angle in degrees), unless otherwise specified. 2 3 4 5 6 7 Datums - B - and - C - to be determined at datum plane - H - . Dimensions "D" and "E1" are to be determined at datum - H - . Dimensions "D2" and "E2" are for top package and dimensions "D" and "E1" are for bottom package. Cross sections A - A to be determined at 0.13 to 0.25mm from the leadtip. Dimension "D" and "D2" does not include mold flash, protrusion or gate burrs. Dimension "E1" and "E2" does not include interlead flash or protrusion. REV. 1A May 2001 9 DATA SHEET KM4270 Ordering Information Model KM4270 Part Number KM4270IC8 KM4270IC8TR3 KM4270IM8 KM4270IM8TR3 Package SOIC-8 SOIC-8 MSOP-8 MSOP-8 Container Rail Reel Rail Reel Pack Qty 95 2500 50 4000 Temperature range for all parts: -40C to +85C. DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICES TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com (c) 2001 Fairchild Semiconductor Corporation |
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