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| Final Electrical Specifications LTC1992 Fully Differential Input/Output Amplifier/Driver July 2003 FEATURES s s s s s s s s s DESCRIPTIO Fully Differential Input and Output CLOAD Stable up to 10,000pF Adjustable Output Common Mode Voltage Rail-to-Rail Output Swing Low Supply Current: 1.2mA (Max) High Output Current: 10mA (Min) Specified on a Single 2.7V to 5V Supply DC Offset Voltage <2.5mV (Max) MSOP 8-Lead Package The LTC(R)1992 is a fully differential low power amplifier. The LTC1992 has a separate internal common mode feedback path for outstanding output phase balancing and reduced second order harmonics. The VOCM pin sets the output common mode level independent of the input common mode level. This feature makes level shifting of signals easy. The differential inputs operate with signals ranging from rail-to-rail with a common mode level from the negative supply up to 1.3V from the positive supply. The differential input DC offset is typically 250V. The rail-to-rail outputs sink and source 10mA. The LTC1992 is stable for all capacitive loads up to 10,000pF. The LTC1992 can be used in single-supply applications with supply voltages as low as 2.7V. It can also be used with dual supplies up to 5V. The LTC1992 is available in an 8 pin MSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. APPLICATIO S s s s s s Differential Driver/Receiver Differential Amplification Single-Ended to Differential Conversion Level Shifting Trimmed Phase Response for Multichannel Systems TYPICAL APPLICATIO Single-Ended to Differential Conversion 10k LTC1992 5V 10k 0V -5V VIN 10k 0.01F INPUT SIGNAL FROM A 5V SYSTEM 5V 3 4 1 -+ 7 VMID 2 VOCM 8 + -5 6 5V 2.5V 0V 5V 2.5V 0V OUTPUT SIGNAL FROM A SINGLE-SUPPLY SYSTEM 1992 TA01a 1992 TA01b VIN (5V/DIV) +OUT (2V/DIV) 10k -OUT Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. U 5V 0V -5V 5V 0V 1992I U U 1 LTC1992 ABSOLUTE (Note 1) AXI U RATI GS PACKAGE/ORDER I FOR ATIO TOP VIEW -IN 1 VOCM 2 +VS 3 +OUT 4 8 7 6 5 +IN VMID -VS -OUT Total Supply Voltage (+V S to -V S) .......................... 12V Maximum Voltage on any Pin .......... (-VS - 0.3V) VPIN (+VS + 0.3V) Output Short-Circuit Duration (Note 3) ............ Indefinite Operating Temperature Range (Note 5) LTC1992CMS8/LTC1992IMS8 ............-40C to 85C LTC1992HMS8 ..................................-40C to 125C Specified Temperature Range (Note 6) LTC1992CMS8/LTC1992IMS8 ............-40C to 85C LTC1992HMS8 ..................................-40C to 125C Storage Temperature Range ................ - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C - +- + MS8 PACKAGE 8-LEAD PLASTIC MSOP TJMAX = 150C, JA = 250C/W ORDER PART NUMBER LTC1992CMS8 LTC1992IMS8 LTC1992HMS8 MS8 PART MARKING LTYU LTZC LTAGR Consult LTC Marketing for parts specified with wider operating temperature ranges. The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. +VS = 5V, -VS = 0V, VINCM = VOUTCM = VOCM = 2.5V, unless otherwise noted. VOCM is the voltage on the VOCM pin. VOUTCM is defined as (V+OUT + V- OUT)/2. VINCM is defined as (V+IN + V-IN)/2. VINDIFF is defined as (V+IN - V- IN). VOUTDIFF is defined as (V+OUT - V-OUT). LTC1992CMS8 LTC1992ISM8 MIN TYP MAX q q q q q q q q q q ELECTRICAL CHARACTERISTICS SYMBOL VOSDIFF VOSDIFF/T PARAMETER Differential Offset Voltage (Input Referred) Differential Offset Voltage Drift (Input Referred) Input Bias Current Input Offset Current Input Resistance Input Capacitance CONDITIONS VS = 2.7V VS = 5V VS = 5V VS = 2.7V VS = 5V VS = 5V VS = 2.7V to 5V VS = 2.7V to 5V LTC1992HMS8 MIN TYP MAX 0.25 0.25 0.25 10 10 10 4 4 4 UNITS mV mV mV V/C V/C V/C 0.25 0.25 0.25 10 10 10 2 0.1 500 3 100 18 1 1 2.5 2.5 2.5 IB IOS RIN CIN en in VINCMR CMRR PSRR GCM 250 100 2 0.1 500 3 100 18 1 1 400 150 Input Referred Noise Voltage Density f = 10Hz f = 1kHz Input Noise Current Density Input Signal Common Mode Range Common Mode Rejection Ratio (Input Referred) Power Supply Rejection Ratio (Input Referred) VINCM = -0.1V to 3.7V VS = 2.7V to 5V f = 10Hz f = 1kHz q nV/Hz nV/Hz pA/Hz pA/Hz V dB dB (-VS)- 0.1V (+VS)- 1.3V q 69 90 q q q q q q q q q q (-VS)- 0.1V (+VS)- 1.3V 69 90 72 80 1 0.1 -85 0.5 1 2 10 10 10 75 80 1 0.1 -85 0.5 1 2 10 10 10 VOSCM VOSCM /T Common Mode Gain(VOUTCM /VOCM) Common Mode Gain Error Output Balance (VOUTCM /(VOUTDIFF) VOUTDIFF = -2V to +2V Common Mode Offset Voltage VS = 2.7V VS = 5V (VOUTCM - VOCM) VS = 5V Common Mode Offset Voltage Drift VS = 2.7V VS = 5V VS = 5V 0.3 -60 12 15 18 0.35 -60 15 17 20 V/C V/C V/C 1992I 2 U pA pA M pF % dB mV mV mV W U U WW W LTC1992 The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25C. +VS = 5V, -VS = 0V, VINCM = VOUTCM = VOCM = 2.5V, unless otherwise noted. VOCM is the voltage on the VOCM pin. VOUTCM is defined as (V+OUT + V-OUT)/2. VINCM is defined as (V+IN + V-IN)/2. VINDIFF is defined as (V+IN - V-IN). VOUTDIFF is defined as (V+OUT - V-OUT). LTC1992CMS8 LTC1992ISM8 MIN TYP MAX q q ELECTRICAL CHARACTERISTICS SYMBOL VOUTCMR RINVOCM IBVOCM VMID VOUT PARAMETER Output Signal Common Mode Range (Voltage Range for the VOCM Pin) Input Resistance, VOCM Pin Input Bias Current, VOCM Pin Voltage at the VMID Pin Output Voltage, High (Note 2) Output Voltage, Low (Note 2) Output Voltage, High (Note 2) Output Voltage, Low (Note 2) Output Voltage, High (Note 2) Output Voltage, Low (Note 2) CONDITIONS LTC1992HMS8 MIN TYP MAX (-VS)+0.5V (+VS)- 1.3V (-VS)+0.5V (+VS)- 1.3V 500 2 2.50 2.69 2.61 2.52 0.02 0.10 0.20 4.99 4.90 4.81 0.02 0.10 0.20 4.99 4.89 4.80 - 4.99 - 4.90 - 4.80 30 30 30 30 30 30 0.75 3.2 3.0 UNITS V M pA V V V V V V V V V V V V V V V V V V V mA mA mA mA mA mA V/s MHz MHz MHz dB V mA mA mA mA VS = 2.7V to 5V VS = 2.7V, Load = 10k VS = 2.7V, Load = 5mA VS = 2.7V,Load = 10mA VS = 2.7V, Load = 10k VS = 2.7V, Load = 5mA VS = 2.7V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 5V, Load = 10k VS = 5V, Load = 5mA VS = 5V, Load = 10mA VS = 2.7V, VOUT = 1.35V VS = 5V, VOUT = 2.5V VS = 5V, VOUT = 0V VS = 2.7V, VOUT =1.35V VS = 5V, VOUT = 2.5V VS = 5V, VOUT = 0V q q q q q q q q q q q q q q q q q q q q q q q q q q q 2.44 2.60 2.50 2.29 2.56 2.43 2.60 2.50 2.29 0.10 0.25 0.35 4.90 4.80 4.70 0.10 0.25 0.35 4.85 4.80 4.60 -4.90 -4.75 -4.65 20 20 20 13 13 13 0.25 3.0 1.9 4.90 4.85 4.75 4.90 4.85 4.65 ISC Output Short-Circuit Current Sourcing (Notes 2,3) Output Short-Circuit Current Sinking (Notes 2,3) SR GBW Slew Rate (Note 4) Gain-Bandwidth Product (fTEST = 100kHz) Large-Signal Voltage Gain Supply Voltage Range Supply Current TA = 25C LTC1992CMS8 q LTC1992IMS8/LTC1992HMS8 q q q 20 20 20 13 13 13 0.25 3.0 2.5 1.9 3.5 4.0 4.0 500 2 2.50 2.69 2.61 2.52 0.02 0.10 0.20 4.99 4.90 4.81 0.02 0.10 0.20 4.99 4.89 4.80 -4.98 -4.90 -4.80 30 30 30 30 30 30 0.75 3.2 2.57 0.10 0.25 0.41 0.10 0.30 0.42 -4.85 -4.75 -4.55 3.5 4.0 AVOL VS IS 80 2.7 0.65 0.75 0.7 0.8 11 1.0 1.2 1.2 1.5 2.7 80 0.65 0.8 0.7 0.9 11 1 1.5 1.2 1.8 VS = 2.7V to 5V VS = 5V q q Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Output load is connected to the midpoint of the +VS and -VS potentials. Measurement is taken single-ended, one output loaded at a time. Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum when the output is shorted indefinitely. Note 4: Slew Rate is measured single-ended. The numbers listed are also single-ended and the differential slew rate would double the listed numbers. Note 5: The LTC1992CMS8 and LTC1992IMS8 are guaranteed functional over an operating temperature of -40C to 85C. The LTC1992HMS8 is guaranteed functional over the extended operating temperature of - 40C to 125C. Note 6: The LTC1992CMS8 is guaranteed to meet the specified performance limits over the 0C to 70C temperature range and is designed, characterized and expected to meet the specified performance limits over the -40C to 85C temperature range but is not tested or QA sampled at these temperatures. The LTC1992IMS8 is guaranteed to meet the specified performance limits over the -40C to 85C temperature range. The LTC1992HMS8 is guaranteed to meet the specified performance limits over the -40C to 125C temperature range. 1992I 3 LTC1992 PI FU CTIO S -IN, +IN (Pins 1, 8): Inverting and Noninverting Inputs of the Amplifier. VOCM (Pin 2): Output Common Mode Voltage Set Pin. The voltage on this pin sets the output signal's common mode voltage level. The output common mode level is set independent of the input common mode level. This is a high impedance input and must be connected to a known and controlled voltage. It must never be left floating. +VS, -VS (Pins 3, 6): The +VS and -VS power supply pins should be bypassed with 0.1F capacitors to an adequate analog ground or ground plane. The bypass capacitors should be located as closely as possible to the supply pins. +OUT, -OUT (Pins 4, 5): The Positive and Negative Outputs of the Amplifier. These rail-to-rail outputs are designed to drive capacitive loads as high as 10,000pF. VMID (Pin 7): Mid-Supply Reference. This pin is connected to an on-chip resistive voltage divider to provide a midsupply reference. This provides a convenient way to set the output common mode level at half-supply. If used for this purpose, Pin 2 will be shorted to Pin 7, Pin 7 should be bypassed with a 0.1F capacitor to ground. If this reference voltage is not used, leave the pin floating. BLOCK DIAGRA RELATED PARTS PART NUMBER LT1167 LTC1992-2 LT6600-20 DESCRIPTION Precision Instrumentation Amplifier Differential In/Out Amplifier with Gain of 2 Differential In/Out Amplifier and 20MHz Lowpass Filter COMMENTS Single Resistor Sets the Gain Trimmed Phase Response, Rail-to-Rail Output Very Low Noise, Standard Differential Amplifier Pinout 4 Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 q FAX: (408) 434-0507 q W U U U +VS 3 -IN 1 V+ 200k 1 1 30k - 4 +OUT VMID 7 200k V- - + A1 A2 + 30k VOCM 2 -1 1 5 -OUT +IN 8 6 -VS 1992I LT/TP 0703 1K * PRINTED IN USA www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2003 |
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