LT1990 - ±250V Input Range G = 1, 10, Micropower ...

1 LT1990 . 250V Input Range G = 1, 10, Micropower , Difference Amplifier U. FEATURES DESCRIPTIO. Pin Selectable Gain of 1 or 10 The LT 1990 is a Micropower precision difference ampli- High Common Mode Voltage Range : fier with a very high common mode Input voltage Range . It 85V Window (VS = 5V, 0V) has pin selectable gains of 1 or 10. The LT1990 operates 250V (VS = 15V) over a 250V common mode voltage Range on a 15V. Common Mode Rejection Ratio: 70dB Min supply. The inputs are fault protected from common Input Protection to 350V mode voltage transients up to 350V and differential Gain Error: Max voltages up to 500V.

2 The LT1990 is ideally suited for both PSRR: 82dB Min high side and low side current or voltage monitoring. High Input Impedance: 2M Differential, 500k Common Mode On a single 5V supply, the LT1990 has an adjustable 85V. Micropower : 120 A Max Supply Current Input Range , 70dB min CMRR and draws less than 120 A. Wide Supply Range : to 36V supply current. The rail-to-rail output maximizes the dy- 3dB Bandwidth: 100kHz namic Range , especially important for single supplies as Rail-to-Rail Output low as 8-Pin SO Package The LT1990 is specified for single 3V, 5V and 15V.

3 U supplies over both commercial and industrial temperature APPLICATIO S ranges. The LT1990 is available in the 8-pin SO package. Battery Cell Voltage Monitoring , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. High Voltage Current Sensing Signal Acquisition in Noisy Environments Input Protection Fault Protected Front Ends Level Sensing Isolation U. TYPICAL APPLICATIO. Full-Bridge Load Current Monitor +VSOURCE 5V. LT1990 . 900k 10k 8.

4 7. 1M 100k 2.. RS 6. VOUT. + 3 1M. +. IL VREF = 4. 10k 5. IN OUT 1nF. LT6650 40k 900k GND FB 40k 100k 20k 12V VCM 73V. VOUT = VREF (10 IL RS) 1. 1990 TA01. 1 F. 1990fb 1. LT1990 . W W W U U W U. ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO. (Notes 1, 2). Total Supply Voltage (V + to V ) .. 36V TOP VIEW. Input Voltage Range REF 1 8 GAIN1. Continuous .. 250V IN 2 7 V+. Transient ( ) .. 350V +IN 3 6 OUT. Differential .. 500V V 4 5 GAIN2. Output Short-Circuit Duration (Note 3) .. Indefinite S8 PACKAGE. 8-LEAD PLASTIC SO. Operating Temperature Range (Note 4) TJMAX = 150 C, JA = 190 C/W.

5 LT1990C .. 40 C to 85 C ORDER PART NUMBER S8 PART MARKING. LT1990I .. 40 C to 85 C. LT1990CS8 1990. LT1990H .. 40 C to 125 C. LT1990IS8 1990I. Specified Temperature Range (Note 5). LT1990HS8 1990H. LT1990C .. 40 C to 85 C. LT1990 ACS8 1990A. LT1990I .. 40 C to 85 C. LT1990 AIS8 1990AI. LT1990H .. 40 C to 125 C. LT1990 AHS8 1990AH. Junction Temperature .. 150 C. Order Options Tape and Reel: Add #TR. Storage Temperature Range .. 65 C to 150 C Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF. Lead Temperature (Soldering, 10 sec.)

6 300 C Lead Free Part Marking: Consult LTC Marketing for parts specified with wider operating temperature ranges. 3V/5V ELECTRICAL CHARACTERISTICS. VS = 3V, 0V; VS = 5V, 0V; RL = 10k, VCM = VREF = half supply, G = 1, 10, TA = 25 C, unless otherwise noted. (Note 6). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. G Gain Pins 5 and 8 = Open 1. Pins 5 and 8 = VREF 10. G Gain Error VOUT = to (+Vs) LT1990 , G = 1 %. LT1990A, G = 1 %. G = 10, VS = 5V, 0V %. GNL Gain Nonlinearity VS = 5V, 0V; VOUT = to G=1 %. G = 10 %. VCM Input Voltage Range Guaranteed by CMRR.

7 VS = 3V, 0V; VREF = 5 25 V. VS = 5V, 0V; VREF = 5 80 V. VS = 5V, 0V; VREF = 38 47 V. CMRR Common Mode Rejection Ratio VS = 3V, 0V (Note 7). RTI (Referred to Input ) VCM = 5V to 25V, VREF = LT1990 60 68 dB. LT1990A 70 75 dB. VS = 5V, 0V. VCM = 5V to 80V, VREF = LT1990 60 68 dB. LT1990A 70 75 dB. VS = 5V, 0V (Note 7). VCM = 38V to 47V, VREF = LT1990 60 68 dB. LT1990A 70 75 dB. 1990fb 2. LT1990 . 3V/5V ELECTRICAL CHARACTERISTICS. VS = 3V, 0V; VS = 5V, 0V; RL = 10k, VCM = VREF = half supply, G = 1, 10, TA = 25 C, unless otherwise noted.

8 (Note 6). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. VOS Offset Voltage, RTI G = 1, 10 3 mV. en Input Noise Voltage, RTI fO = to 10Hz 22 VP-P. Noise Voltage Density, RTI fO = 1kHz 1 V/ Hz RIN Input Resistance Differential 2 M . Common Mode M . PSRR Power Supply Rejection Ratio, RTI VS = to , VCM = VREF = 80 92 dB. Minimum Supply Voltage Guaranteed by PSRR V. IS Supply Current (Note 8) 105 120 A. VOL Output Voltage Swing LOW IN = V+, +IN = Half Supply (Note 8) 30 50 mV. VOH Output Voltage Swing HIGH IN = 0V, +IN = Half Supply VS = 3V, 0V, Below V+ 100 150 mV.

9 VS = 5V, 0V, Below V+ 120 175 mV. ISC Output Short-Circuit Current Short to GND (Note 9) 4 8 mA. Short to V+ (Note 9) 13 20 mA. BW Bandwidth ( 3dB) G=1 100 kHz G = 10 kHz SR Slew Rate G = 1, VS = 5V, 0V, VOUT = to V/ s Settling Time to 4V Step, G = 1, VS = 5V, 0V 45 s AVREF Reference Gain to Output G=1 1 G = 10 1 The denotes the specifications which apply over the temperature Range of 0 C TA 70 C. VS = 3V, 0V; VS = 5V, 0V; RL = 10k, VCM = VREF = half supply, G = 1, 10, unless otherwise noted. (Notes 4, 6). LT1990C/LT1990I.

10 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS. G Gain Error VOUT = to (+VS) LT1990 , G = 1 %. LT1990A, G = 1 %. G = 10 %. G/T Gain vs Temperature G = 1 (Note 10) 2 10 ppm/ C. G = 10 (Note 10) 7 20 ppm/ C. VCM Input Voltage Range Guaranteed by CMRR. VS = 3V, 0V, VREF = 5 25 V. VS = 5V, 0V, VREF = 5 80 V. VS = 5V, 0V, VREF = 37 48 V. CMRR Common Mode Rejection Ratio, RTI VS = 3V, 0V (Note 7). VCM = 5V to 25V, VREF = LT1990 58 dB. LT1990A 68 dB. VS = 5V, 0V. VCM = 5V to 80V, VREF = LT1990 58 dB. LT1990A 68 dB. VS = 5V, 0V (Note 7).