Datasheet

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LTC2057/LTC2057HV

2057f

For more information www.linear.com/LTC2057

Typical applicaTion

FeaTures DescripTion

High Voltage, Low Noise

Zero-Drift Operational Amplifier

The LTC

2057 is a high voltage, low noise, zero-drift op-

erational amplifier

that offers precision DC performance

over a wide supply range of 4.75V to 36V or 4.75V to

60V for the LTC2057HV. Offset voltage and 1/f noise are

suppressed, allowing this amplifier to achieve a maximum

offset voltage of 4μV and a DC to 10Hz input noise volt

age of

200

P-P

(typ). The LTC2057’s self-calibrating

circuitry results in low offset voltage drift with temperature,

0.015μV/°C (max), and zero-drift over time. The amplifier

also features an excellent power supply rejection ratio

(PSRR) of 160dB and a common mode rejection ratio

(CMRR) of 150dB (typ).

The LTC2057 provides rail-to-rail output swing and an

input common mode range that includes the V

–

rail (V

–

0.1V to V

– 1.5V). In addition to low offset and noise, this

amplifier features a 1.5MHz (typ) gain-bandwidth product

and a 0.45V/μs (typ) slew rate.

Wide supply range, combined with low noise, low offset,

and excellent PSRR and CMRR make the LTC2057 and

LTC2057HV well suited for high dynamic-range test,

measurement, and instrumentation systems.

L, LT, LT C , LT M, Linear Technology, Over-The-Top, and the Linear logo are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

Input Offset Voltage

vs Supply Voltage

applicaTions

Supply Voltage Range

4.75V to 36V (LTC2057)

4.75V to 60V (LTC2057HV)

Offset Voltage: 4μV (Maximum)

Offset Voltage Drift: 0.015μV/°C

(Maximum, –40°C to 125°C)

Input Noise Voltage

200nV

P-P

, DC to 10Hz (Typ)

11nV/√Hz, 1kHz (Typ)

Input Common Mode Range: V

–

– 0.1V to V

– 1.5V

Rail-to-Rail Output

Unity Gain Stable

Gain Bandwidth Product: 1.5MHz (Typ)

Slew Rate: 0.45V/μs (Typ)

VOL

: 150dB (Typ)

PSRR: 160dB (Typ)

CMRR: 150dB (Typ)

Shutdown Mode

High Resolution Data Acquisition

Reference Buffering

Test and Measurement

Electronic Scales

Thermocouple Amplifiers

Strain Gauges

Low-Side Current Sense

Automotive Monitors and Control

Wide Input Range Precision Gain-of-100 Instrumentation Amplifier

30V

–30V

–IN

+IN

30V

11.5k

–30V

2057 TA01a

LTC2057HV

INPUT CM RANGE = ±28V WITH 4V OF OUTPUT SWING

CMRR = 130dB (TYP), INPUT OFFSET VOLTAGE = 1µV (TYP)

–

LT1991A

18V

–18V

REF

OUT

232Ω

(V)

–5

–4

–3

–2

–1

(µV)

40 505

45 55 6560

2057 TA01b

5 TYPICAL UNITS

= V

= 25°C

Summary of content (32 pages)

PAGE 1
LTC2057/LTC2057HV High Voltage, Low Noise Zero-Drift Operational Amplifier Description Features Supply Voltage Range n 4.75V to 36V (LTC2057) n 4.75V to 60V (LTC2057HV) n Offset Voltage: 4μV (Maximum) n Offset Voltage Drift: 0.015μV/°C (Maximum, –40°C to 125°C) n Input Noise Voltage n 200nV P-P, DC to 10Hz (Typ) n 11nV/√Hz, 1kHz (Typ) n Input Common Mode Range: V– – 0.1V to V+ – 1.5V n Rail-to-Rail Output n Unity Gain Stable n Gain Bandwidth Product: 1.5MHz (Typ) n Slew Rate: 0.
PAGE 2
LTC2057/LTC2057HV Absolute Maximum Ratings (Note 1) Total Supply Voltage (V+ to V–) LTC2057 ...............................................................40V LTC2057HV............................................................65V Input Voltage –IN, +IN.................................... V– – 0.3V to V+ + 0.3V SD, SDCOM ............................. V– – 0.3V to V+ + 0.3V Input Current –IN, +IN............................................................ ±10mA SD, SDCOM....................................
PAGE 3
LTC2057/LTC2057HV Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2057IDD#PBF LTC2057IDD#TRPBF LGCZ 8-Lead Plastic DFN (3mm × 3mm) –40°C to 85°C LTC2057HVIDD#PBF LTC2057HVIDD#TRPBF LGDB 8-Lead Plastic DFN (3mm × 3mm) –40°C to 85°C LTC2057HDD#PBF LTC2057HDD#TRPBF LGCZ 8-Lead Plastic DFN (3mm × 3mm) –40°C to 125°C LTC2057HVHDD#PBF LTC2057HVHDD#TRPBF LGDB 8-Lead Plastic DFN (3mm × 3mm) –40°C to 125°C LTC2057IMS8#PBF LTC2057IMS8#T
PAGE 4
LTC2057/LTC2057HV Electrical Characteristics (LTC2057/LTC2057HV) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Unless otherwise noted, VS = ±2.5V; VCM = VOUT = 0V.
PAGE 5
LTC2057/LTC2057HV Electrical Characteristics (LTC2057/LTC2057HV) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Unless otherwise noted, VS = ±15V; VCM = VOUT = 0V.
PAGE 6
LTC2057/LTC2057HV Electrical Characteristics (LTC2057HV) The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. Unless otherwise noted, VS = ±30V; VCM = VOUT = 0V.
PAGE 7
LTC2057/LTC2057HV Electrical Characteristics Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC2057I/LTC2057HVI are guaranteed to meet specified performance from –40°C to 85°C. The LTC2057H/LTC2057HVH are guaranteed to meet specified performance from –40°C to 125°C. Note 3: These parameters are guaranteed by design.
PAGE 8
LTC2057/LTC2057HV Typical Performance Characteristics Input Offset Voltage Distribution 160 TYPICAL UNITS VS = ±2.5V µ = –0.441 µV σ = 0.452µV 30 25 20 15 10 25 20 15 10 0 –3 –2.5 –2 –1.5 –1 –0.5 0 0.5 1 1.5 2 2.
PAGE 9
LTC2057/LTC2057HV Typical Performance Characteristics Input Offset Voltage vs Supply Voltage Long-Term Input Offset Voltage Drift 5 100 40 TYPICAL UNITS 4 VS = ±2.5V 3 2 1 1 0 –1 0 –2 –3 –3 –4 –4 –5 0.1 100 10 TIME (HOURS) 1 1000 2057 G09 0.
PAGE 10
LTC2057/LTC2057HV Typical Performance Characteristics Common Mode Rejection Ratio vs Frequency Input Current Noise Spectrum 120 AV = +11 VS = ±2.5V VS = ±30V 0.20 VS = 30V VCM = VS /2 100 80 0.15 CMRR (dB) INPUT-REFERRED CURRENT NOISE DENSITY (pA/√Hz) 0.25 0.10 60 40 0.05 0 20 0.
PAGE 11
LTC2057/LTC2057HV Typical Performance Characteristics VS = ±2.5V, AV = +1 SD – SDCOM ISS VIN VOUT 3 2 1 0 0.3 0.2 0.1 0 –0.1 –10 10 0 20 30 TIME (µs) SD – SDCOM ISS VIN VOUT 2 1 0 0.4 0.3 0.2 0.1 0 –0.1 –0.2 50 40 VS = ±30V, AV = +1 3 –10 10 0 20 30 TIME (µs) 2057 G26 Start-Up Transient with Sinusoid Input 2 1 SD – SDCOM 0.4 ISS 0.3 VIN VOUT 0.2 0 0.1 0.1 –0.1 VS = ±2.5V AV = +1 10 –0.2 20 30 40 TIME (µs) 50 60 4 3 2 1 0 0.4 0.3 SD – SDCOM ISS VIN VOUT 0.2 0.1 0 –0.
PAGE 12
LTC2057/LTC2057HV Typical Performance Characteristics THD+N vs Frequency Supply Current vs Supply Voltage IS (mA) 25°C 0.8 –40°C 0.6 –55°C 0.2 0.2 2057 G32 1.4 8 150°C 5 125°C 4 3 85°C 25°C 2 –55°C 1 0 IS (mA) IS (µA) 6 0 VS = ±2.5V SDCOM = –2.5V 1.2 7 85°C 0.8 25°C 0 SHUTDOWN PIN CURRENT (µA) SHUTDOWN PIN CURRENT (µA) 0 ISD –50°C ISDCOM –50°C ISD 125°C ISDCOM 125°C –3 –4 –5 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 SD – SDCOM (V) SD = SDCOM = VS /2 0.8 –1 2057 G38 0 0.
PAGE 13
LTC2057/LTC2057HV Typical Performance Characteristics Output Voltage Swing High vs Load Current 100 VS = ±2.5V 150°C 25°C 0.1 0.01 0.1 1 ISOURCE (mA) 10 VS = ±2.5V 100 85°C 125°C 150°C 10m 25°C 0.01 0.1 1 ISINK (mA) 10 10 –40°C 0.1 25°C 0.01 0.1 1 ISINK (mA) 10 100 ISC (mA) SINKING 30 60 10 100 2057 G46 VS = ±30V SINKING 30 10 10 0 –50 –25 0 SOURCING 40 SOURCING 10 2057 G47 0.1 1 ISINK (mA) 50 20 25 50 75 100 125 150 TEMPERATURE (°C) 0.
PAGE 14
LTC2057/LTC2057HV Typical Performance Characteristics Large Signal Response Large Signal Response 0.6 6 VS = ±2.5V VIN = ±0.5V AV = +1 CL = 200pF 0.4 8 6 4 VOUT (V) 0 0 –0.2 –2 –0.4 –4 VS = ±30V VIN = ±10V AV = +1 CL = 200pF 10 2 VOUT (V) VOUT (V) VS = ±15V VIN = ±5V AV = +1 CL = 200pF 4 0.2 Large Signal Response 12 2 0 –2 –4 –6 –8 –10 –0.
PAGE 15
LTC2057/LTC2057HV Typical Performance Characteristics Large Signal Settling Transient VIN (V) VIN (V) Large Signal Settling Transient 2 1 0 2 1 0 12 8 6 VIN 4 VOUT VOUT(AVG) 2 VOUT (mV) 6 VIN 4 VOUT VOUT(AVG) 2 8 0 0 –2 –2 –5 0 5 10 15 20 25 30 35 40 45 50 55 60 TIME (µs) –4 –5 0 5 10 15 20 25 30 35 40 45 50 55 60 TIME (µs) 2057 G59 VS = ±2.5V AV = –100 RF = 10kΩ CL = 100pF –0.
PAGE 16
LTC2057/LTC2057HV Pin Functions MS8 and S8/DD8 SD (Pin 1/Pin 1): Shutdown Control Pin. SDCOM (Pin 8/Pin 8): Reference Voltage for SD. –IN (Pin 2/Pin 2): Inverting Input. V+ (Pin 7/Pin 7): Positive Power Supply. +IN (Pin 3/Pin 3): Non-Inverting Input. OUT (Pin 6/Pin 6): Amplifier Output V– (Pin 4/Pin 4, 9): Negative Power Supply. NC (Pin 5/Pin 5): No Internal Connection. MS10 GRD (Pin 1): Guard Ring. No Internal Connection. SD (Pin 10): Shutdown Control Pin. –IN (Pin 2): Inverting Input.
PAGE 17
LTC2057/LTC2057HV Block Diagrams Amplifier V+ 525Ω –IN V+ V+ – V– V OUT + + 525Ω +IN V– V– 2057 BD1 V– Shutdown Circuit V+ V+ 0.5µA 10k SD – V+ V– 5.25V VTH ≈ 1.4V 10k SDCOM –+ SD + 0.5µA V– 2057 BD2 V– 2057f For more information www.linear.
PAGE 18
LTC2057/LTC2057HV Applications Information Input Voltage Noise Chopper stabilized amplifiers like the LTC2057 achieve low offset and 1/f noise by heterodyning DC and flicker noise to higher frequencies. In a classical chopper stabilized amplifier, this process results in idle tones at the chopping frequency and its odd harmonics. The LTC2057 utilizes circuitry to suppress these spurious artifacts to well below the offset voltage. The typical ripple magnitude at 100kHz is much less than 1µVRMS.
PAGE 19
LTC2057/LTC2057HV Applications Information For zero-drift amplifiers, clock feed-through will be proportional to source impedance and the magnitude of injection current, a measure of which is IB at 25°C. In order to minimize clock feed-through, keep gain-setting resistors and source impedances as low as possible. If high impedances are required, place a capacitor across the feedback resistor to limit the bandwidth of the closed loop gain. Doing so will effectively filter out the clock feed-through signal.
PAGE 20
LTC2057/LTC2057HV Applications Information RF § HEAT SOURCE/ POWER DISSIPATOR # RELAY ** VTHERMAL –+ THERMAL GRADIENT RG VTHERMAL VIN –IN † ‡ MATCHING RELAY * RL§ +IN ** RG –+ LTC2057 RF NC * CUT SLOTS IN PCB FOR THERMAL ISOLATION. ** INTRODUCE DUMMY JUNCTIONS AND COMPONENTS TO OFFSET UNAVOIDABLE JUNCTIONS OR CANCEL THERMAL EMFs. † ALIGN INPUTS SYMMETRICALLY WITH RESPECT TO THERMAL GRADIENTS. ‡ INTRODUCE DUMMY TRACES AND COMPONENTS FOR SYMMETRICAL THERMAL HEAT SINKING.
PAGE 21
LTC2057/LTC2057HV Applications Information Board leakage can be minimized by encircling the input connections with a guard ring operated at a potential very close to that of the inputs. The ring must be tied to a low impedance node. For inverting configurations, the guard ring should be tied to the potential of the positive input (+IN). For non-inverting configurations, the guard ring should be tied to the potential of the negative input (–IN).
PAGE 22
LTC2057/LTC2057HV Applications Information Power Dissipation Shutdown Mode Since the LTC2057/LTC2057HV is capable of operating at >30V total supply, care should be taken with respect to power dissipation in the amplifier. When driving heavy loads at high voltages, use the θJA of the package to estimate the resulting die-temperature rise and take measures to ensure that the resulting junction temperature does not exceed specified limits.
PAGE 23
LTC2057/LTC2057HV Typical Applications DC Stabilized, Ultralow Noise Composite Amplifier AV = + RF + 1 = 101 RG 20 LTC2057HV – 47nF 1MΩ –20V 1k 20V + VIN RG 20Ω 20k 20V 8 LT1037 VOUT INPUT VOLTAGE NOISE DENSITY (nV/√Hz) 20V Input Voltage Noise Spectrum of Composite Amplifier 16 14 12 10 8 6 4 2 0 – –20V 18 0.
PAGE 24
LTC2057/LTC2057HV Typical Applications Paralleling Choppers to Improve Noise + R5 LTC2057 – R2 R1 + R5 LTC2057 – R2 VIN AV = + R2 R4 +1 • +1 R1 R3 LTC2057 R1 VOUT – R4 + R5 LTC2057 R3 – R2 R1 + R5 LTC2057 – R2 2057 TA04 R1 DC TO 10Hz NOISE = 200nVP-P , e = 11nV/√Hz , in = √N • 170fA/√Hz, IB < N • 200pA (MAX) n √N √N WHERE N IS THE NUMBER OF PARALLELED INPUT AMPLIFIERS. FOR N = 4, DC TO 10Hz NOISE = 100nVP-P , en = 5.5nV/√Hz, in = 340fA/√Hz, IB < 800pA (MAX).
PAGE 25
LTC2057/LTC2057HV Typical Applications Wide Input Range Precision Gain-of-100 Instrumentation Amplifier 30V –IN + LTC2057HV – 18V –30V 232Ω 11.5k 11.
PAGE 26
LTC2057/LTC2057HV Typical Applications Differential Thermocouple Amplifier 10nF 249k 1% 1k 1% TYPE K + (YELLOW) 1k 1% – (RED) VCM 15V 15V 8 9 – LTC2057 + 10 1 –15V 2 3 22Ω M1 P1 7 V CC LT1991A P3 V EE P9 4 GND 6 VOUT = 10mV/°C REF 5 THERMOCOUPLE TEMP OF –200°C TO 1250°C GIVES –2V TO 12.5V VOUT ASSUMING 40µV/°C TEMPCO. CHECK ACTUAL TEMPCO TABLE. VO R– OUT –15V 0.1µF LT1025 VIN M3 100k COUPLE THERMALLY V+ M9 2057 TA07 499k = V – + 0.1V TO V + – 1.
PAGE 27
LTC2057/LTC2057HV Typical Applications 18-Bit DAC with ±25V Output Swing REF 5V 30V + – – LT1012 LT5400-1 10kΩ MATCHED RESISTOR NETWORK LTC2057HV + 150pF –30V RIN SPI WITH READBACK REF RCOM ROFS RFB 8pF 4 LTC2756 18-BIT DAC WITH SPAN SELECT 5V VDD 0.1µF SET SPAN TO ±10V 30V IOUT1 – IOUT2 + LTC2057HV VOUT GND –30V GND 2057 TA08 VCS/LD (V) Time Domain Response 10 VCS/LD 5 0 30 20 VOUT 10 –10 VOUT (V) 0 –20 TIME (50µs/DIV) 2057 TA09 –30 2057f For more information www.
PAGE 28
LTC2057/LTC2057HV Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. DD8 Package 8-Lead Plastic DFN (3mm × 3mm) (Reference LTC DWG # 05-08-1698 Rev C) 0.70 ±0.05 3.5 ±0.05 1.65 ±0.05 2.10 ±0.05 (2 SIDES) PACKAGE OUTLINE 0.25 ± 0.05 0.50 BSC 2.38 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (NOTE 6) 0.200 REF 3.00 ±0.10 (4 SIDES) R = 0.125 TYP 5 0.40 ± 0.10 8 1.
PAGE 29
LTC2057/LTC2057HV Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS8 Package 8-Lead Plastic MSOP (Reference LTC DWG # 05-08-1660 Rev F) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.65 (.0256) BSC 0.42 ± 0.038 (.0165 ± .0015) TYP 8 7 6 5 0.52 (.0205) REF RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .
PAGE 30
LTC2057/LTC2057HV Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. MS Package 10-Lead Plastic MSOP (Reference LTC DWG # 05-08-1661 Rev E) 0.889 ± 0.127 (.035 ± .005) 5.23 (.206) MIN 3.20 – 3.45 (.126 – .136) 3.00 ± 0.102 (.118 ± .004) (NOTE 3) 0.50 0.305 ± 0.038 (.0197) (.0120 ± .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT 0.254 (.010) 10 9 8 7 6 3.00 ± 0.102 (.118 ± .004) (NOTE 4) 4.90 ± 0.152 (.193 ± .006) DETAIL “A” 0.
PAGE 31
LTC2057/LTC2057HV Package Description Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings. S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610 Rev G) .050 BSC .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 8 .245 MIN .160 ±.005 5 .150 – .157 (3.810 – 3.988) NOTE 3 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 2 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .
PAGE 32
LTC2057/LTC2057HV Typical Application Microvolt Precision 18-Bit ADC Driver 2.5V AV = 50 BW = 1kHz 5V 50mV + 0V 10µF LTC2368-18 1µF –IN 10Ω 1% –5V 10k 205Ω REF 100k 1% 10nF –5V 5V LTC6655-2.5 VOUT_F VIN SHDN OVDD +IN – VOUT_S GND ≤ 5 ksps IS RECOMMENDED TO MINIMIZE ERROR FROM ADC INPUT CURRENT AND 150Ω RESISTOR. 0.1µF VDD 150Ω LTC2057 1.