Datasheet OPA2277U, OPA277PA, OPA277UA, OPA4277PA, OPA4277UA-2K5 Datasheet (Burr Brown)

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Page 1

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OPERATIONAL AMPLIFIERS

OPA277

OPA2277

OPA4277

4277

High Precision

OPA277 OPA2277 OPA4277

FEATURES

● ULTRA LOW OFFSET VOLTAGE: 10µV

● ULTRA LOW DRIFT: ±0.1µV/°C

● HIGH OPEN-LOOP GAIN: 134dB

● HIGH COMMON-MODE REJECTION: 140dB

● HIGH POWER SUPPLY REJECTION: 130dB

● LOW BIAS CURRENT: 1nA max

● WIDE SUPPLY RANGE: ±2V to ±18V

● LOW QUIESCENT CURRENT: 800 µA/amp

● SINGLE, DUAL, AND QUAD VERSIONS

● REPLACES OP-07, OP-77, OP-177

DESCRIPTION

The OPA277 series precision op amps replace the industry standard OP-177. They offer improved noise, wider output voltage swing, and are twice as fast with half the quiescent current. Features include ultra low offset voltage and drift, low bias current, high common-mode rejection, and high power supply rejection. Single, dual, and quad versions have identical specifications for maximum design flexibility.

OPA277 series op amps operate from ±2V to ±18V supplies with excellent performance. Unlike most op amps which are specified at only one supply voltage, the OPA277 series is specified for real-world applications; a single limit applies over the ±5V to ±15V supply range.

High performance

is maintained as the amplifiers swing to their specified limits.

APPLICATIONS

● TRANSDUCER AMPLIFIER

● BRIDGE AMPLIFIER

● TEMPERATURE MEASUREMENTS

● STRAIN GAGE AMPLIFIER

● PRECISION INTEGRATOR

● BATTERY POWERED INSTRUMENTS

● TEST EQUIPMENT

Because the initial offset voltage (±20µV max) is so low, user adjustment is usually not required. However, the single version (OPA277) provides external trim pins for special applications.

OPA277 op amps are easy to use and free from phase inversion and overload problems found in some other op amps. They are stable in unity gain and provide excellent dynamic behavior over a wide range of load conditions. Dual and quad versions feature completely independent circuitry for lowest crosstalk and freedom from interaction, even when overdriven or overloaded.

Single (OPA277) and dual (OPA2277) versions are available

OPA277

Offset Trim

1 2

–In

+In

V–

8-Pin DIP, SO-8

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8 7 6 5

Out A

–In A +In A

Offset Trim V+ Output NC

1 2 3

V–

OPA2277

8-Pin DIP, SO-8

in 8-pin DIP and SO-8 surface-mount packages. The quad (OPA4277) comes in 14-pin DIP and SO-14 surface-mount packages. All are fully specified from

–40°C to +85°C and

operate from –55°C to +125°C.

OPA4277

Out A

–In A

V+

Out B

–In B

+In B

+In A

V+ +In B –In B

Out B

3 4 5

6 7

14-Pin DIP, SO-14

Out D

–In D

+In D

V–

+In C

–In C

Out C

Page 2

SPECIFICATIONS: VS = ±5V to VS = ±15V

At TA = +25°C, and RL = 2kΩ, unless otherwise noted.

Boldface limits apply over the specified temperature range, –40°C to +85°C.

OPA277P, U OPA2277PA, UA

OPA2277P, U OPA4277PA, UA

(1)

PARAMETER CONDITION MIN TYP

MAX MIN TYP

OFFSET VOLTAGE

Input Offset Voltage: V

OPA277P, U (high grade, single) ±10 ±20 µV

OPA2277P, U (high grade, dual) ±10 ±25 µV All PA, UA Versions ±20 ±50 µV

Input Offset Voltage Over Temperature

OPA277P, U (high grade, single) T OPA2277P, U (high grade, dual) T All PA, UA Versions T

Input Offset Voltage Drift dV

OPA277P, U (high grade, single) T

/dT

OPA2277P, U (high grade, dual) T All PA, UA Versions T

= –40°C to +85°C ±30 µV

= –40°C to +85°C ±50 µV

= –40°C to +85°C ±100 µV

= –40°C to +85°C ±0.1 ±0.15 µV/°C

= –40°C to +85°C ±0.1 ±0.25 µV/°C

= –40°C to +85°C ±0.15 ±1 µV/°C

Input Offset Voltage: (all models)

vs Time 0.2 ✻ µV/mo vs Power Supply PSRR V

= –40°C to +85°C VS = ±2V to ±18V ±0.5 ±1 µV/V

Channel Separation (dual, quad) dc 0.1 ✻ µV/V

= ±2V to ±18V ±0.3 ±0.5 ✻ ±1 µV/V

INPUT BIAS CURRENT

Input Bias Current I

= –40°C to +85°C ±2 ±4 nA

Input Offset Current I

= –40°C to +85°C ±2 ±4 nA

±0.5 ±1 ✻ ±2.8 nA

NOISE

Input Voltage Noise, f = 0.1 to 10Hz 0.22 ✻ µVp-p

0.035 ✻ µVrms

Input Voltage Noise Density, f = 10Hz e

f = 100Hz 8 ✻ nV/√Hz

12 ✻ nV/√Hz

f = 1kHz 8 ✻ nV/√Hz f = 10kHz 8 ✻ nV/√Hz

Current Noise Density, f = 1kHz i

0.2 ✻ pA/√Hz

INPUT VOLTAGE RANGE

Common-Mode Voltage Range V Common-Mode Rejection CMRR V

= –40°C to +85°C VCM = (V–) +2V to (V+) –2V 128 115 dB

= (V–) +2V to (V+) –2V 130 140 115 ✻ dB

(V–) +2 (V+) –2 ✻✻V

INPUT IMPEDANCE

Differential 100 || 3 ✻ MΩ || pF Common-Mode V

= (V–) +2V to (V+) –2V 250 || 3 ✻ GΩ || pF

OPEN-LOOP GAIN

Open-Loop Voltage Gain A

= –40°C to +85°C

= (V–)+0.5V to (V+)–1.2V, RL = 10kΩ

OLVO

VO = (V–)+0.5V to (V+)–1.5V, RL = 2kΩ VO = (V–)+0.5V to (V+)–1.5V, RL = 2kΩ

126 134 ✻✻ dB 126 ✻ dB

140 ✻ dB

FREQUENCY RESPONSE

Gain-Bandwidth Product GBW 1 ✻ MHz Slew Rate SR 0.8 ✻ V/µs Settling Time, 0.1% V

0.01% V Overload Recovery Time V Total Harmonic Distortion + Noise THD+N 1kHz, G = 1, V

= ±15V, G = 1, 10V Step 14 ✻ µs

= ±15V, G = 1, 10V Step 16 ✻ µs

• G = V

= 3.5Vrms 0.002 ✻ %

3 ✻ µs

OUTPUT

Voltage Output V

= –40°C to +85°C RL = 10kΩ (V–) +0.5 (V+) –1.2 ✻✻V

= –40°C to +85°C RL = 2kΩ (V–) +1.5 (V+) –1.5 ✻✻V

Short-Circuit Current I Capacitive Load Drive C

LOAD

RL = 10kΩ (V–) +0.5 (V+) –1.2 ✻✻V

= 2kΩ (V–) +1.5 (V+) –1.5 ✻✻V

±35 ✻ mA

See Typical Curve ✻

OPA277PA, UA

(1)

MAX UNITS

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant any BURR-BROWN product for use in life support devices and/or systems.

OPA277, 2277, 4277

Page 3

SPECIFICATIONS: VS = ±5V to VS = ±15V (CONT)

At TA = +25°C, and RL = 2kΩ, unless otherwise noted.

Boldface limits apply over the specified temperature range, –40°C to +85°C.

OPA277P, U OPA2277PA, UA

OPA2277P, U OPA4277PA, UA

(1)

PARAMETER CONDITION MIN TYP

MAX MIN TYP

OPA277PA, UA

(1)

MAX UNITS

POWER SUPPLY

Specified Voltage Range V Operating Voltage Range ±2 ±18 ✻✻V Quiescent Current (per amplifier) I

= –40°C to +85°C IO = 0 ±900 ✻ µA

TEMPERATURE RANGE

Specified Range –40 85 ✻✻°C Operating Range –55 125 ✻✻°C Storage Range –55 125 ✻✻°C Thermal Resistance

SO-8 Surface-Mount 150 ✻ °C/W 8-Pin DIP 100 ✻ °C/W 14-Pin DIP 80 ✻ °C/W SO-14 Surface-Mount 100 ✻ °C/W

✻ Specifications same as OPA277P, U. NOTE: (1) V

= ±15V.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage .................................................................................... 36V

Input Voltage ..................................................... (V–) –0.7V to (V+) +0.7V

Output Short-Circuit

Operating Temperature .................................................. –55°C to +125°C

Storage Temperature ..................................................... –55°C to +125°C

Junction Temperature ...................................................................... 150°C

Lead Temperature (soldering, 10s) ................................................. 300°C

NOTE: (1) Stresses above these rating may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. (2) Short-circuit to ground, one amplifier per package.

(2)

.............................................................. Continuous

(1)

IO = 0 ±790 ±825 ✻✻µA

±5 ±15 ✻✻V

ELECTROSTATIC DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Burr-Brown recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.

ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.

PACKAGE/ORDERING INFORMATION

OFFSET OFFSET PACKAGE

VOLTAGE VOLTAGE DRIFT DRAWING TEMPERATURE ORDERING TRANSPORT

PRODUCT max, Single

OPA277PA ±50 ±1 8-Pin DIP 006 –40°C to +85°C OPA277PA Rails OPA277P ±20 ±0.15 8-Pin DIP 006 –40°C to +85°C OPA277P Rails OPA277UA ±50 ±1 SO-8 Surface Mount 182 –40°C to +85°C OPA277UA Rails

" " " " " " OPA277UA/2K5 Tape and Reel

OPA277U ±20 ±0.15 SO-8 Surface Mount 182 –40°C to +85°C OPA277U Rails

" " " " " " OPA277U/2K5 Tape and Reel

Dual

OPA2277PA ±50 ±1 8-Pin DIP 006 –40°C to +85°C OPA2277PA Rails OPA2277P ±25 ±0.25 8-Pin DIP 006 –40°C to +85°C OPA2277P Rails OPA2277UA ±50 ±1 SO-8 Surface Mount 182 –40°C to +85°C OPA2277UA Rails

" " " " " " OPA2277UA/2K5 Tape and Reel

OPA2277U ±25 ±0.25 SO-8 Surface Mount 182 –40°C to +85°C OPA2277U Rails

" " " " " " OPA2277U/2K5 Tape and Reel

Quad

OPA4277PA ±50 ±1 14-Pin DIP 010 –40°C to +85°C OPA4277PA Rails OPA4277UA ±50 ±1 SO-14 Surface Mount 235 –40°C to +85°C OPA4277UA Rails

" " " " " " OPA4277UA/2K5 Tape and Reel

NOTE: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) Products followed by a slash (/) are only available in Tape and Reel in the quantities indicated (e.g. /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “OPA277UA/2K5” will get a single 2500 piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book.

µV max, µV/°C PACKAGE NUMBER

(1)

RANGE NUMBER(2) MEDIA

OPA277, 2277, 4277

Page 4

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = ±15V, and RL = 2kΩ, unless otherwise noted.

OPEN-LOOP GAIN/PHASE

140 120 100

(dB)

40 20

–20

0.1 1 10 100 1k 10k 100k 1M 10M

1000

100

INPUT NOISE AND CURRENT NOISE

SPECTRAL DENSITY vs FREQUENCY

vs FREQUENCY

CL = 0 CL = 1500pF

Frequency (Hz)

Current Noise

0 –30 –60 –90 –120 –150 –180

Phase (°)

PSR, CMR (dB)

POWER SUPPLY AND COMMON-MODE

140

120

100

0.1 1 10 100 1k 10k 100k 1M

REJECTION vs FREQUENCY

–PSR

Frequency (Hz)

INPUT NOISE VOLTAGE vs TIME

Noise signal is bandwidth limited to lie between 0.1Hz and 10Hz.

+PSR

CMR

Current Noise (fA/√Hz)

Voltage Noise (nV/√Hz)

1 10 100 1k 10k

140

120

100

Dual and quad devices. G = 1, all channels. Quad measured

channel A to D or B to C—other combinations yield similar or improved rejection.

Channel Separation (dB)

10 100 1k 10k 100k

Voltage Noise

Frequency (Hz)

CHANNEL SEPARATION vs FREQUENCY

Frequency (Hz)

50nV/div

1sec/div

TOTAL HARMONIC DISTORTION + NOISE

0.1

G = 10, RL = 2kΩ, 10kΩ

0.01

THD+Noise (%)

G = 1, RL = 2kΩ, 10kΩ

0.001 10 100 1k 10k 100k

vs FREQUENCY

= 3.5Vrms

OUT

Frequency (Hz)

OPA277, 2277, 4277

Page 5

TYPICAL PERFORMANCE CURVES (CONT)

–75 –50 –25 0 25 50 75 100 125

160

150

140

130

120

110

100

, CMR, PSR (dB)

Temperature (°C)

, CMR, PSR vs TEMPERATURE

CMR

PSR

At TA = +25°C, VS = ±15V, and RL = 2kΩ, unless otherwise noted.

OFFSET VOLTAGE PRODUCTION DISTRIBUTION

Typical distribution

of packaged units. Single, dual, and

quad included.

8 6 4

Percent of Amplifiers (%)

2 0

–50–45–40–35–30–25–20–15–10 –5 0 5 10 15 20 25 30 35 40 45 50

WARM-UP OFFSET VOLTAGE DRIFT

Offset Voltage (µV)

OFFSET VOLTAGE DRIFT

Percent of Amplifiers (%)

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0

PRODUCTION DISTRIBUTION

Typical distribution of packaged units. Single, dual, and quad included.

Offset Voltage (µV/°C)

–1

Offset Voltage Change (µV)

–2

–3

0 30 60 90 120

15 45 75 105

Time from Power Supply Turn-On (s)

5 4 3 2 1

0 –1 –2

Input Bias Current (nA)

–3 –4 –5

INPUT BIAS CURRENT vs TEMPERATURE

Curves represent typical

production units.

–75 –50 –25 0 25 50 75 100

Temperature (°C)

125

1000

950 900 850 800 750 700 650

Quiescent Current (µA)

600 550 500

SHORT-CIRCUIT CURRENT vs TEMPERATURE

–75 –50 –25 0 25 50 75 100 125

QUIESCENT CURRENT AND

±I

–I

Temperature (°C)

OPA277, 2277, 4277

100 90 80 70 60 50 40 30 20

Short-Circuit Current (mA)

10 0

Page 6

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, VS = ±15V, and RL = 2kΩ, unless otherwise noted.

CHANGE IN INPUT BIAS CURRENT

vs POWER SUPPLY VOLTAGE

2.0

1.5

1.0

Curve shows normalized change in bias current with respect to V (+20V). Typical I –0.5nA to +0.5nA at V

0.5

0.0

(nA)

∆I

–0.5

VCM = 0V

–1.0 –1.5 –2.0

0 5 10 15 20 25 30 35

Supply Voltage (V)

QUIESCENT CURRENT vs SUPPLY VOLTAGE

1000

900

800

= ±10V

= ±10V.

may range from

per amplifier

CHANGE IN INPUT BIAS CURRENT

vs COMMON-MODE VOLTAGE

2.0

1.5

1.0

Curve shows normalized change in bias current with respect to V from –05.nA to +0.5nA at V

= 0V. Typical IB may range

= 0V.

VS = ±5V

0.5

0.0

(nA)

∆I

–0.5

VS = ±15V

–1.0 –1.5

–2.0

–15 –10 –5 0 5 10

Common-Mode Voltage (V)

SETTLING TIME vs CLOSED-LOOP GAIN

100

10V step

= 1500pF

0.01%

0.1%

700

Quiescent Current (µA)

600

500

0 ±5 ±10 ±15 ±20

Supply Voltage (V)

MAXIMUM OUTPUT VOLTAGE

vs FREQUENCY

VS = ±15V

Output Voltage (Vp-p)

VS = ±5V

10k 100k

Frequency (Hz)

Settling Time (µs)

±1 ±10 ±100

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

(V+) (V+) – 1 (V+) – 2 (V+) – 3 (V+) – 4 (V+) – 5

(V–) + 5 (V–) + 4 (V–) + 3

Output Voltage Swing (V)

(V–) + 2 (V–) + 1

(V–)

0 ±5 ±10 ±15 ±20 ±25 ±30

Gain (V/V)

125°C

Output Current (mA)

–55°C

25°C

–55°C

OPA277, 2277, 4277

Page 7

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, VS = ±15V, and RL = 2kΩ, unless otherwise noted.

Overshoot (%)

SMALL-SIGNAL OVERSHOOT

vs LOAD CAPACITANCE

Gain = –1

Gain = +1

1k10010 10k 100k

Load Capacitance (pF)

SMALL-SIGNAL STEP RESPONSE

G = +1, CL = 0, VS = ±15V

Gain = ±10

2V/div

LARGE-SIGNAL STEP RESPONSE

G = +1, C

SMALL-SIGNAL STEP RESPONSE

G = +1, C

= 1500pF, VS = ±15V

10µs/div

= 1500pF, VS = ±15V

20mV/div

1µs/div

20mV/div

1µs/div

OPA277, 2277, 4277

Page 8

APPLICATIONS INFORMATION

The OPA277 series is unity-gain stable and free from unexpected output phase reversal, making it easy to use in a wide range of applications. Applications with noisy or high impedance power supplies may require decoupling capacitors close to the device pins. In most cases 0.1µF capacitors are adequate.

The OPA277 series has very low offset voltage and drift. To achieve highest performance, circuit layout and mechanical conditions should be optimized. Offset voltage and drift can be degraded by small thermoelectric potentials at the op amp inputs. Connections of dissimilar metals will generate thermal potential which can degrade the ultimate performance of the OPA277 series. These thermal potentials can be made to cancel by assuring that they are equal in both input terminals.

• Keep thermal mass of the connections made to the two input terminals similar.

• Locate heat sources as far as possible from the critical input circuitry.

• Shield op amp and input circuitry from air currents such as cooling fans.

OPERATING VOLTAGE

OPA277 series op amp operate from ±2V to ±18V supplies with excellent performance. Unlike most op amps which are specified at only one supply voltage, the OPA277 series is specified for real-world applications; a single limit applies over the ±5V to ±15V supply range. This allows a customer operating at VS = ±10V to have the same assured performance as a customer using ±15V supplies. In addition, key parameters are guaranteed over the specified temperature range, –40°C to +85°C. Most behavior remains unchanged through the full operating voltage range (±2V to ±18V). Parameters which vary significantly with operating voltage or temperature are shown in typical performance curves.

OFFSET VOLTAGE ADJUSTMENT

The OPA277 series is laser-trimmed for very low offset voltage and drift so most circuits will not require external adjustment. However, offset voltage trim connections are provided on pins 1 and 8. Offset voltage can be adjusted by

connecting a potentiometer as shown in Figure 1. This adjustment should be used only to null the offset of the op amp. This adjustment should not be used to compensate for offsets created elsewhere in a system since this can introduce additional temperature drift.

V+

Trim Range: Exceeds

0.1µF

Offset Voltage Specification

20kΩ

OPA277

V–

offset voltage of op amp—see text.

OPA277 single op amp only.

Use offset adjust pins only to null

FIGURE 1. OPA277 Offset Voltage Trim Circuit.

INPUT PROTECTION

The inputs of the OPA277 series are protected with 1kΩ series input resistors and diode clamps. The inputs can withstand ±30V differential inputs without damage. The protection diodes will, of course, conduct current when the inputs are over-driven. This may disturb the slewing behavior of unity-gain follower applications, but will not damage the op amp.

INPUT BIAS CURRENT CANCELLATION

The input stage base current of the OPA277 series is internally compensated with an equal and opposite cancellation circuit. The resulting input bias current is the difference between the input stage base current and the cancellation current. This residual input bias current can be positive or negative.

When the bias current is canceled in this manner, the input bias current and input offset current are approximately the same magnitude. As a result, it is not necessary to use a bias current cancellation resistor as is often done with other op amps (Figure 2). A resistor added to cancel input bias current errors may actually increase offset voltage and noise.

Op Amp

RB = R2 || R

(a)

Conventional op amp with external bias current cancellation resistor.

FIGURE 2. Input Bias Current Cancellation.

OPA277, 2277, 4277

OPA277

OPA277 with no external bias current cancellation resistor.

No bias current cancellation resistor (see text)

(b)

Page 9

V+

R–∆R

For integrated solution see: INA126, INA2126 (dual)

FIGURE 3. Load Cell Amplifier.

Load

Cell

R+∆R

R–∆RR+∆R

1/2

OPA2277

V–

V+

1/2

OPA2277

V–

INA125 (on-board reference) INA122 (single-supply)

= (V1 – V2)(1 + )

OUT

∼ 1mA

Type J

50Ω

1kΩ

25Ω

0.01µF

412Ω

= 1250Ω

V+

1/2

OPA2277

10kΩ

1/2

OPA2277

V–

(G = 1 + = 50)

REG

LIN

1250Ω

–

RET

XTR105

REG

V+

+–

IO = 4mA + (VIN – VIN)

40 R

FIGURE 4. Thermocouple Low Offset, Low Drift Loop Measurement with Diode Cold Junction Compensation.

OPA277, 2277, 4277