LT1997IDF-2#TRPBF

LT1997-2 Precision, Wide Voltage Range, Gain Selectable Funnel Amplifier DESCRIPTION FEATURES Precision Attenuation: Gain = 0.1, 0.2, 0.25 nn ±255V Common Mode Voltage Range nn 105dB Minimum CMRR (Gain = 0.1) nn 0.006% (60ppm) Maximum Gain Error nn 1ppm/°C Maximum Gain Error Drift nn 2ppm Maximum Gain Nonlinearity nn Wide Supply Voltage Range: 3.3V to 50V nn Rail-to-Rail Output nn 350µA Supply Current nn 80µV Maximum Op Amp Offset Voltage nn 1MHz –3dB Bandwidth (Gain = 0.1) nn Low Power Shutdown: 20µA nn Space-Saving MSOP and DFN Packages The LT®1997-2 is an attenuating (funnel) difference amplifier that can be used to translate large differential signals to the low voltage range compatible with ADCs. It combines a precision operational amplifier with highly-matched resistors to form a one-chip solution to attenuate and level shift voltages accurately using no external components. It comes with three standard pin-selectable gain options (0.1, 0.2 and 0.25), which can be further combined to form gains from 0.0455 to 0.55 (attenuations of 1.82 to 22) with accuracy of 0.006% (60ppm). The LT1997-2 also works across a very wide input common-mode voltage range (±255V), enabling robust operation in demanding industrial environments. Its excellent resistor matching results in a common mode rejection ratio of greater than 105dB. nn APPLICATIONS The resistors maintain their excellent matching over temperature; the matching temperature coefficient is guaranteed less than 1ppm/°C. The resistors are extremely linear with voltage, resulting in a gain nonlinearity of less than 2ppm. High Voltage to Low Voltage Level Translation nn ADC Driver nn Bidirectional Wide Common Mode Range Voltage and Current Sensing nn Industrial Data-Acquisition Front-Ends nn Replacement for Isolation Circuits nn Differential to Single-Ended Conversion nn The LT1997-2 is fully specified at 5V and ±15V supplies and from –40°C to 125°C. The device is available in space saving 16-lead MSOP and 4mm × 4mm DFN14 packages. All registered trademarks and trademarks are the property of their respective owners. TYPICAL APPLICATION Interfacing a 20VP-P Ground-Referenced Input Signal to a 5V ADC +10V –10V LT1997-2 Driving LTC2364-16, ADC, fIN = 1kHz, 32768-Point FFT 5V 0 V+ LT1997-2 –INA –INB –INC 25k 4.5V – OUT + 250k 125k 50k 100k +INA +INB +INC 50k SHDN V– 0.5V 200Ω IN+ 2.5V 1.8V TO 5V VDD 0VDD LTC2364-16 8nF REF2 IN– REF REF1 5V 5.5V TO 40V IN OUT LT6657-5 GND AMPLITUDE (dBFS) 100k 125k 250k VS = 5V VOUT = 4VP-P HD2 = –104.3dBc HD3 = –104.4dBc SFDR = 104.3dB THD = –101dB SNR = 91.8dB SINAD = 89.5dB –20 –40 –60 –80 –100 –120 –140 47µF 0 25 50 75 FREQUENCY (kHz) 100 125 19972 TA01b GND 19972 TA01a Rev 0 Document Feedback For more information www.analog.com 1 LT1997-2 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltages (V+ to V–).........................................60V +INA, –INA, +INB, –INB, +INC, –INC (Note 2)..........................................V– ±270V REF, REF1, REF2..................... (V– + 60V) to (V– – 0.3V) SHDN...................................... (V+ + 0.3V) to (V– – 0.3V) Output Current (Continuous) (Note 6).....................50mA Output Short-Circuit Duration (Note 3)...........................................Thermally Limited Temperature Range (Notes 4, 5) LT1997I-2.................................................–40 to 85°C LT1997H-2.............................................. –40 to 125°C Maximum Junction Temperature........................... 150°C Storage Temperature Range.......................–65 to 150°C MSOP Lead Temperature (Soldering, 10 sec)......... 300°C PIN CONFIGURATION TOP VIEW +INA 1 +INB 3 TOP VIEW 14 –INA 15 V– +INA 1 16 –INA 12 –INB +INB 3 14 –INB 11 NC +INC REF1 REF2 V– NC 4 +INC 5 SHDN 6 10 –INC 9 V+ REF 7 8 5 6 7 8 12 11 10 9 –INC V+ SHDN OUT MS PACKAGE VARIATION: MS16 (12) 16-LEAD PLASTIC MSOP OUT TJMAX = 150°C, θJA = 130°C/W DF PACKAGE 14(12)-LEAD (4mm × 4mm) PLASTIC DFN TJMAX = 150°C, θJA = 45°C/W , θJC = 3°C/W EXPOSED PAD (PIN 15) IS V–, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1997IDF-2#PBF LT1997IDF-2#TRPBF 19972 14-Lead (4mm × 4mm) Plastic DFN –40°C to 85°C LT1997HDF-2#PBF LT1997HDF-2#TRPBF 19972 14-Lead (4mm × 4mm) Plastic DFN –40°C to 125°C LT1997IMS-2#PBF LT1997IMS-2#TRPBF 19972 16-Lead Plastic MSOP –40°C to 85°C LT1997HMS-2#PBF LT1997HMS-2#TRPBF 19972 16-Lead Plastic MSOP –40°C to 125°C *The temperature grade is identified by a label on the shipping container. Consult ADI Marketing for parts specified with wider operating temperature ranges. Parts ending with PBF are RoHS and WEEE compliant. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix. Rev 0 2 For more information www.analog.com LT1997-2 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C. Difference Amplifier Configuration, V+ = 15V, V– = –15V, VCM = VOUT = VREF = VREF1 = VREF2 = 0V. VCMOP is the common mode voltage of the internal op amp. SYMBOL PARAMETER CONDITIONS ∆G Gain Error ∆G/∆T Gain Drift vs Temperature (Note 6) VOUT = ±2.8V G = 0.1 VOUT = ±5.6V G = 0.2 VOUT = ±7V G = 0.25 VOUT = ±7V GNL Gain Nonlinearity VOUT = ±7V MIN TYP MAX UNITS ±0.001 ±0.006 ±0.008 ±0.006 ±0.008 ±0.006 ±0.008 ±1 % % % % % % ppm/°C l ±0.001 l ±0.001 l ±0.2 l ±1 l VOS Op Amp Offset Voltage (Note 9) V– < VCMOP < V+ – 1.75V ±20 l ∆VOS/∆T Op Amp Offset Voltage Drift (Note 6) V– < VCMOP < V+ – 1.75V IB Op Amp Input Bias Current V– + 0.25V < VCMOP < V+ – 1.75V RIN CMRR Op Amp Input Offset Current l Input Impedance (Note 8) l l l 115 63 52 137.5 75 62.5 160 87 73 kΩ kΩ kΩ l l l 420 210 168 105 103 101 99 101 98 103 101 103 101 99 97 99 97 99 97 99 97 –255 –140 –115 500 250 200 120 580 290 232 kΩ kΩ kΩ dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB dB V V V Common Mode Rejection Ratio, Referred to Output, MS16 Package V– + 0.25V < VCMOP < V+ – 1.75V Common Mode G = 0.1 G = 0.2 G = 0.25 Differential G = 0.1 G = 0.2 G = 0.25 G = 0.1, VCM = ±28V l G = 0.2, VCM = ±28V l G = 0.25, VCM = ±28V l CMRR Common Mode Rejection Ratio, Referred to Output, DF14 Package G = 0.1, VCM = ±28V l G = 0.1, VCM = ±255V, VS = ±25V l G = 0.2, VCM = ±28V l G = 0.2, VCM = ±140V, VS = ±25V l G = 0.25, VCM = ±28V l G = 0.25, VCM = ±115V, VS = ±25V l VCM Input Voltage Range (Note 7) +INA/–INA +INB/–INB +INC/–INC l l l ±2 ppm ppm µV µV µV/°C –5 –15 –3 –10 l IOS ±0.5 l ±2 ±3 ±80 ±200 ±1.5 ±0.5 5 15 3 10 nA nA nA nA 118 118 118 118 116 116 116 116 255 140 115 Rev 0 For more information www.analog.com 3 LT1997-2 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C. Difference Amplifier Configuration, V+ = 15V, V– = –15V, VCM = VOUT = VREF = VREF1 = VREF2 = 0V. VCMOP is the common mode voltage of the internal op amp. SYMBOL PARAMETER CONDITIONS ∆R/R Available in MS16 Package Only Reference Divider Matching Error ∆R R –R = REF1 REF2 R ⎛ RREF1 + RREF2 ⎞ ⎜⎝ ⎟⎠ 2 Power Supply Rejection Ratio (Note 9) VS = ±1.65V to ±25V, VCM = VOUT = Mid-Supply eni Output Noise Voltage Density f = 1kHz G = 0.1 G = 0.2 G = 0.25 f = 0.1Hz to 10Hz G = 0.1 G = 0.2 G = 0.25 No Load ISINK = 5mA No Load ISOURCE = 5mA 50Ω to V+ 50Ω to V– ∆VOUT = ±7V VOL ISC Output Voltage Swing Low (Referred to V–) Output Voltage Swing High (Referred to V+) Short-Circuit Output Current SR Slew Rate BW Small Signal –3dB Bandwidth tS Settling Time VOH VS TYP MAX ±0.002 ±0.009 ±0.011 l PSRR Output Noise Voltage MIN l 114 l l l l l l l 10 10 0.45 G = 0.1 G = 0.2 G = 0.25 G = 0.1 0.1%, ∆VOUT = 10V 0.01%, ∆VOUT = 10V G = 0.2 0.1%, ∆VOUT = 10V 0.01%, ∆VOUT = 10V G = 0.25 0.1%, ∆VOUT = 10V 0.01%, ∆VOUT = 10V Supply Voltage l tON Turn-On Time VIL SHDN Input Logic Low (Referred to V+) l VIH SHDN Input Logic High (Referred to V+) l ISHDN SHDN Pin Current l IS Supply Current dB 37 39 40 nV/√Hz nV/√Hz nV/√Hz 0.9 0.95 1 50 280 50 450 30 32 0.75 150 500 150 900 µVP-P µVP-P µVP-P mV mV mV mV mA mA V/µs 1 1.2 1.1 MHz MHz MHz 15 19 µs µs 16.9 20.6 µs µs 17.1 20.9 µs µs V V µs 3 3.3 50 50 –2.5 –1.2 V V –10 –15 µA 350 400 600 25 70 µA µA µA µA l 20 l % % 124 16 Active, VSHDN ≥ V+ – 1.2V Active, VSHDN ≥ V+ – 1.2V Shutdown, VSHDN ≤ V+ – 2.5V Shutdown, VSHDN ≤ V+ – 2.5V UNITS Rev 0 4 For more information www.analog.com LT1997-2 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, –40°C < TA < 85°C for I-grade parts, –40°C < TA < 125°C for H-grade parts, otherwise specifications are at TA = 25°C. Difference Amplifier Configuration, V+ = 5V, V– = 0V, VCM = VOUT = VREF = VREF1 = VREF2 = Mid-Supply. VCMOP is the common mode voltage of the internal op amp. SYMBOL PARAMETER CONDITIONS ∆G VOUT = 1V to 4V G = 0.1 Gain Error MIN TYP ±0.001 l ±0.001 G = 0.2 l ±0.001 G = 0.25 l ∆G/∆T Gain Drift vs Temperature (Note 6) VOUT = 1V to 4V GNL Gain Nonlinearity VOUT = 1V to 4V Op Amp Offset Voltage (Note 9) V–