OPA337, OPA2337
OPA338, OPA2338

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Twx: 910-952-1111 · Internet: http://www.burr-brown.com/ · Cable: BBRCORP · Telex: 066-6491 · FAX: (520) 889-1510 · Immediate Product Info: (800) 548-6132

PDS-1410C

PDS-1410D

Printed in U.S.A. June, 2000

FEATURES

Micro

SIZE PACKAGES:

SOT23-5
SOT23-8

SINGLE-SUPPLY OPERATION

RAIL-TO-RAIL OUTPUT SWING

FET-INPUT: I

= 10pA max

HIGH SPEED:

OPA337: 3MHz, 1.2V/

s (G = 1)

OPA338: 12.5MHz, 4.6V/

s (G = 5)

OPERATION FROM 2.5V to 5.5V

HIGH OPEN-LOOP GAIN: 120dB

LOW QUIESCENT CURRENT: 525

A/amp

SINGLE AND DUAL VERSIONS

DESCRIPTION

The OPA337 and OPA338 series rail-to-rail output CMOS
operational amplifiers are designed for low cost and minia-
ture applications. Packaged in the new SOT23-8, the
OPA2337EA and OPA2338EA are Burr-Brown's smallest
dual op amps. At 1/4 the size of a conventional SO-8 surface
mount, they are ideal for space-sensitive applications.

Utilizing advanced CMOS technology, OPA337 and
OPA338 op amps provide low bias current, high-speed
operation, high open-loop gain, and rail-to-rail output
swing. They operate on a single supply with operation as
low as 2.5V while drawing only 525

A quiescent current.

In addition, the input common-mode voltage range in-
cludes ground--ideal for single-supply operation.

The OPA337 series is unity-gain stable. The OPA338
series is optimized for gains greater than or equal to five.
They are easy to use and free from phase inversion and
overload problems found in some other op amps. Excel-
lent performance is maintained as the amplifiers swing to
their specified limits. The dual versions feature completely
independent circuitry for lowest crosstalk and freedom
from interaction, even when overdriven or overloaded.

Micro

SIZE, Single-Supply

CMOS OPERATIONAL AMPLIFIERS

Micro

Amplifier

Series

APPLICATIONS

BATTERY-POWERED INSTRUMENTS

PHOTODIODE PRE-AMPS

MEDICAL INSTRUMENTS

TEST EQUIPMENT

AUDIO SYSTEMS

DRIVING ADCs

CONSUMER PRODUCTS

V+

Out B

In B

+In B

Out A

In A

+In A

OPA2337, OPA2338

8-Pin DIP

(1)

, SO-8, SOT23-8

V+

Output

+In

OPA337, OPA338

8-Pin DIP

(1)

, SO-8, MSOP-8

(1)

V+

Out

+In

OPA337, OPA338

SOT23-5

NOTE: (1) DIP AND MSOP-8 versions for OPA337, OPA2337 only.

SPICE Model available at www.burr-brown.com

For most current data sheet and other product

information, visit www.burr-brown.com

OPA337

OPA2337

OPA338

OPA2338

G = 1 STABLE

5 STABLE

SINGLE

DUAL

SINGLE

DUAL

PACKAGE

OPA337

OPA2337

OPA338

OPA2338

SOT23-5

SOT23-8

MSOP-8

SO-8

DIP-8

OPA337

OPA2337

OPA2338

OPA337, OPA2337
OPA338, OPA2338

SPECIFICATIONS: V

= 2.7V to 5.5V

At T

= +25

C, and R

= 25k

connected to V

/2, unless otherwise noted.

Boldface limits apply over the specified temperature range, 40

C to +85

C, V

= 5V.

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.

OPA337NA, EA, UA, PA

OPA2337EA, UA, PA

OPA338NA, UA

OPA2338EA, UA

PARAMETER

CONDITION

MIN

TYP

(1)

MAX

UNITS

OFFSET VOLTAGE
Input Offset Voltage

0.5

= 40

C to +85

3.5

vs Temperature

/dT

vs Power Supply Rejection Ratio

PSRR

= 2.7V to 5.5V

125

V/V

= 40

C to +85

= 2.7V to 5.5V

125

V/V

Channel Separation (dual versions)

0.3

V/V

INPUT BIAS CURRENT
Input Bias Current

0.2

= 40

C to +85

See Typical Curve

Input Offset Current

0.2

NOISE
Input Voltage Noise, f = 0.1Hz to 10Hz

Vp-p

Input Voltage Noise Density, f = 1kHz

nV/

Current Noise Density, f = 1kHz

0.6

fA/

INPUT VOLTAGE RANGE
Common-Mode Voltage Range

= 40

C to +85

0.2

(V+) 1.2

Common-Mode Rejection Ratio

CMRR

0.2V < V

< (V+) 1.2V

= 40

C to +85

0.2V < V

< (V+) 1.2V

INPUT IMPEDANCE
Differential

|| 2

|| pF

Common-Mode

|| 4

|| pF

OPEN-LOOP GAIN
Open-Loop Voltage Gain

= 25k

, 125mV < V

< (V+) 125mV

100

120

= 40

C to +85

= 25k

, 125mV < V

< (V+) 125mV

100

= 5k

, 500mV < V

< (V+) 500mV

100

114

= 40

C to +85

= 5k

, 500mV < V

< (V+) 500mV

100

OPA337 FREQUENCY RESPONSE
Gain-Bandwidth Product

GBW

= 5V, G = 1

MHz

Slew Rate

= 5V, G = 1

1.2

Settling Time: 0.1%

= 5V, 2V Step, C

= 100pF, G = 1

0.01%

= 5V, 2V Step, C

= 100pF, G = 1

2.5

Overload Recovery Time

· G = V

Total Harmonic Distortion + Noise

THD+N

= 5V, V

= 3Vp-p, G = 1, f = 1kHz

0.001

OPA338 FREQUENCY RESPONSE
Gain-Bandwidth Product

GBW

= 5V, G = 5

12.5

MHz

Slew Rate

= 5V, G = 5

4.6

Settling Time: 0.1%

= 5V, 2V Step, C

= 100pF, G = 5

1.4

0.01%

= 5V, 2V Step, C

= 100pF, G = 5

1.9

Overload Recovery Time

· G = V

0.5

Total Harmonic Distortion + Noise

THD+N

= 5V, V

= 3Vp-p, G = 5, f = 1kHz

0.0035

OUTPUT
Voltage Output Swing from Rail

(2)

= 25k

100dB

125

= 40

C to +85

= 25k

100dB

125

= 5k

100dB

150

500

= 40

C to +85

= 5k

100dB

500

Short-Circuit Current

Capacitive Load Drive

LOAD

See Typical Curve

POWER SUPPLY
Specified Voltage Range

= 40

C to +85

2.7

5.5

Minimum Operating Voltage

2.5

Quiescent Current (per amplifier)

= 0

0.525

= 40

C to +85

= 0

1.2

OPA337, OPA2337
OPA338, OPA2338

PACKAGE

SPECIFIED

DRAWING

TEMPERATURE

PACKAGE

ORDERING

TRANSPORT

PRODUCT

DESCRIPTION

PACKAGE

NUMBER

RANGE

MARKING

NUMBER

(1)

MEDIA

OPA337 Series
OPA337NA

Single, G = 1 Stable

5-Lead SOT23-5

331

C to +85

C37

OPA337NA/250

Tape and Reel

OPA337NA/3K

Tape and Reel

OPA337EA

Single, G = 1 Stable

MSOP-8

337

C to +85

G37

OPA337EA/250

Tape and Reel

OPA337EA/2K5

Tape and Reel

OPA337PA

Single, G = 1 Stable

8-Pin DIP

006

C to +85

OPA337PA

Rails

OPA337UA

Single, G = 1 Stable

SO-8 Surface Mount

182

C to +85

OPA337UA

Rails

OPA337UA/2K5

Tape and Reel

OPA2337EA

Dual, G = 1 Stable

8-Lead SOT23-8

348

C to +85

OPA2337EA/250

Tape and Reel

OPA2337EA/3K

Tape and Reel

OPA2337PA

Dual, G = 1 Stable

8-Pin DIP

006

C to +85

OPA2337PA

Rails

OPA2337UA

Dual, G = 1 Stable

SO-8 Surface Mount

182

C to +85

OPA2337UA

Rails

OPA2337UA/2K5

Tape and Reel

OPA338 Series
OPA338NA

Single, G

5 Stable

5-Lead SOT23-5

331

C to +85

A38

OPA338NA/250

Tape and Reel

OPA338NA/3K

Tape and Reel

OPA338UA

Single, G

5 Stable

SO-8 Surface Mount

182

C to +85

OPA338UA

Rails

OPA338UA/2K5

Tape and Reel

OPA2338EA

Dual, G

5 Stable

8-Lead SOT23-8

348

C to +85

OPA2338EA/250

Tape and Reel

OPA2338EA/3K

Tape and Reel

OPA2338UA

Dual, G

5 Stable

SO-8 Surface Mount

182

C to +85

OPA2338UA

Rails

OPA2338UA/2K5

Tape and Reel

NOTES: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces
of "OPA2337UA/2K5" will get a single 2500-piece Tape and Reel.

SPECIFICATIONS: V

= 2.7V to 5.5V

(Cont.)

At T

= +25

C, and R

= 25k

connected to V

/2, unless otherwise noted.

Boldface limits apply over the specified temperature range, 40

C to +85

C, V

= 5V.

OPA337NA, EA, UA, PA

OPA2337EA, UA, PA

OPA338NA, UA

OPA2338EA, UA

PARAMETER

CONDITION

MIN

TYP

MAX

UNITS

TEMPERATURE RANGE
Specified Range

+85

Operating Range

+125

Storage Range

+125

Thermal Resistance

SOT23-5 Surface Mount

200

C/W

SOT23-8 Surface Mount

200

C/W

MSOP-8

150

C/W

SO-8 Surface Mount

150

C/W

8-Pin DIP

100

C/W

NOTES: (1) V

= 5V. (2) Output voltage swings are measured between the output and negative and positive power supply rails.

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 degrada-
tion 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.

Supply Voltage ................................................................................... 5.5V
Input Voltage

(2)

.................................................. (V) 0.5V to (V+) +0.5V

Input Current

(2)

................................................................................. 10mA

Output Short Circuit

(3)

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

Operating Temperature .................................................. 55

C to +125

Storage Temperature ..................................................... 55

C to +125

Junction Temperature ...................................................................... 150

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

NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum ratings for extended periods may degrade
device reliability. (2) Input signal voltage is limited by internal diodes
connected to power supplies. See text. (3) Short circuit to ground, one
amplifier per package.

ABSOLUTE MAXIMUM RATINGS

(1)

PACKAGE/ORDERING INFORMATION

OPA337, OPA2337
OPA338, OPA2338

TYPICAL PERFORMANCE CURVES

At T

= +25

C, V

= +5V, and R

= 25k

connected to V

/2, unless otherwise noted.

OPEN-LOOP GAIN/PHASE vs FREQUENCY

Frequency (Hz)

Open-Loop Gain (dB)

Phase (

)

160

140

120

100

10k

100k

10M

OPA337
OPA338

135

180

CHANNEL SEPARATION vs FREQUENCY

Frequency (Hz)

Channel Separation (dB)

140

130

120

110

100

10k

100k

Dual Versions

INPUT BIAS CURRENT

vs INPUT COMMON-MODE VOLTAGE

Common-Mode Voltage (V)

Input Bias Current (pA)

0.5

0.4

0.3

0.2

0.1

INPUT BIAS CURRENT vs TEMPERATURE

Temperature (

Input Bias Current (pA)

100

0.1

0.01

100

125

POWER SUPPLY REJECTION RATIO AND

COMMON-MODE REJECTION RATIO vs FREQUENCY

Frequency (Hz)

PSRR, CMRR (dB)

100

10k

100k

10M

+PSRR

PSRR

CMRR

INPUT VOLTAGE AND CURRENT NOISE

SPECTRAL DENSITY vs FREQUENCY

Frequency (Hz)

Voltage Noise (nV

Hz)

100

0.1

100

0.1

100

10k

100k

Current Noise (fA

Hz)

Voltage Noise

Current Noise

OPA337, OPA2337
OPA338, OPA2338

TYPICAL PERFORMANCE CURVES

(Cont.)

At T

= +25

C, V

= +5V, and R

= 25k

connected to V

/2, unless otherwise noted.

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

Frequency (Hz)

Output Voltage (Vp-p)

10k

100k

100M

10M

Maximum output

voltage without slew

rate-induced distortion.

OPA337

OPA338

TOTAL HARMONIC DISTORTION + NOISE

vs FREQUENCY

Frequency (Hz)

THD+N (%)

0.1

0.01

0.001

0.0001

100

10k

20k

G = +10, R

= 5k

, 25k

G = +5, R

= 5k

, 25k

= 25k

= 5k

G = +1

= 3Vp-p

OPA337
OPA338

, CMRR, PSRR vs TEMPERATURE

Temperature (°C)

, CMRR (dB)

PSRR (dB)

140

130

120

110

100

130

120

110

100

125

PSRR

CMRR

QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT

vs TEMPERATURE

Temperature (

Quiescent Current (

600

550

500

450

400

350

300

Short-Circuit Current (mA)

100

125

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

Output Current (mA)

Output Voltage (V)

2.5

2.0

1.5

1.0

0.5

1.0

1.5

2.0

2.5

125

Sinking

Sourcing

2.5V

Tied to Ground

QUIESCENT AND SHORT-CIRCUIT CURRENT

vs SUPPLY VOLTAGE

Supply Voltage (V)

Quiescent Current (

Short-Circuit Current (mA)

700

650

600

550

500

450

400

2.5

4.0

3.5

3.0

5.5

5.0

4.5

OPA337, OPA2337
OPA338, OPA2338

TYPICAL PERFORMANCE CURVES

(Cont.)

At T

= +25

C, V

= +5V, and R

= 25k

connected to V

/2, unless otherwise noted.

SMALL-SIGNAL STEP RESPONSE

= 100pF, V

= +5V

s/div

50mV/div

LARGE-SIGNAL STEP RESPONSE

= 100pF, V

= +5V

s/div

500mV/div

OFFSET VOLTAGE DRIFT

PRODUCTION DISTRIBUTION

Percent of Amplifiers (%)

Offset Voltage Drift (µV/°C)

Typical distribution
of packaged units

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

OFFSET VOLTAGE

PRODUCTION DISTRIBUTION

Percent of Amplifiers (%)

Offset Voltage (mV)

3.0

2.5

2.0

1.5

1.0

0.5

0.0

0.5

1.0

1.5

2.0

2.5

3.0

Typical distribution
of packaged units.

OPA337

G = 1

OPA338

G = 5

OPA337

G = 1

OPA338

G = 5

SETTLING TIME vs CLOSED-LOOP GAIN

Closed-Loop Gain (V/V)

Settling Time (

100

0.01%

OPA337

0.1%

OPA338

SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE

Load Capacitance (pF)

Overshoot (%)

10k

100

OPA337

(G =

OPA337

(G =

10)

OPA338

(G =

50)

OPA338

(G =

OPA337, OPA2337
OPA338, OPA2338

APPLICATIONS INFORMATION

The OPA337 series and OPA338 series are fabricated on a
state-of-the-art CMOS process. The OPA337 series is unity-
gain stable. The OPA338 series is optimized for gains
greater than or equal to five. Both are suitable for a wide
range of general purpose applications. Power supply pins
should be bypassed with 0.01

F ceramic capacitors.

OPERATING VOLTAGE

The OPA337 series and OPA338 series can operate from a
+2.5V to +5.5V single supply with excellent performance.
Unlike most op amps which are specified at only one supply
voltage, these op amps are specified for real-world applica-
tions; a single limit applies throughout the +2.7V to +5.5V
supply range. This allows a designer to have the same
assured performance at any supply voltage within the speci-
fied voltage range. Most behavior remains unchanged
throughout the full operating voltage range. Parameters
which vary significantly with operating voltage are shown in
typical performance curves.

FIGURE 2. Input Current Protection for Voltages Exceeding

the Supply Voltage.

OPA337

10mA max

+5V

OUT

OVERLOAD

OUT

, G = +1

(limited by input
common-mode
range)

OUT

, G = 1

(not limited by
input common-
mode range.)

G =

OPA337, V

3V Greater Than V

2.5V

FIGURE 1. OPA337--No Phase Inversion with Inputs

Greater than the Power Supply Voltage.

INPUT VOLTAGE

The input common-mode range extends from (V) 0.2V to
(V+) 1.2V. For normal operation, inputs should be
limited to this range. The absolute maximum input voltage
is 500mV beyond the supplies. Inputs greater than the
input common-mode range but less than maximum input
voltage, while not valid, will not cause any damage to the
op amp. Furthermore, if input current is limited the inputs
may go beyond the power supplies without phase inver-
sion (Figure 1) unlike some other op amps.

Normally, input currents are 0.2pA. However, large inputs
(greater than 500mV beyond the supply rails) can cause
excessive current to flow in or out of the input pins.
Therefore, as well as keeping the input voltage below the
maximum rating, it is also important to limit the input
current to less than 10mA. This is easily accomplished
with an input resistor as shown in Figure 2.

USING THE OPA338 IN LOW GAINS

The OPA338 series is optimized for gains greater than or
equal to five. It has significantly wider bandwidth (12.5MHz)
and faster slew rate (4.6V/

s) when compared to the OPA337

series. The OPA338 series can be used in lower gain con-
figurations at low frequencies while maintaining its high
slew rate with the proper compensation.

Figure 3 shows the OPA338 in a unity-gain buffer configu-
ration. At dc, the compensation capacitor C

is effectively

"open" resulting in 100% feedback (closed-loop gain = 1).
As frequency increases, C

becomes lower impedance and

closed-loop gain increases, eventually becoming 1 + R

(in this case five, which is equal to the minimum gain
required for stability).

The required compensation capacitor value can be deter-
mined from the following equation:

= 1/(2

)

Since f

may shift with process variations, it is recom-

mended that a value less than f

be used for determining C

With f

= 1MHz and R

= 2.5k

, the compensation capaci-

tor is about 68pF.

The selection of the compensation capacitor C

is important.

A proper value ensures that the closed-loop circuit gain is
greater than or equal to five at high frequencies. Referring to
the "Open-Loop Gain vs Frequency" plot in the Typical
Performance Curves section, the OPA338 gain line (dashed
in the curve) has a constant slope (20dB/decade) up to
approximately 3MHz. This frequency is referred to as f

Beyond f

the slope of the curve increases, suggesting that

closed-loop gains less than 5 are not appropriate.

FIGURE 3. Compensation of OPA338 for Unity-Gain Buffer.

2.5k

68pF

10k

OPA338

OUT

Where f

is the frequency at which closed-loop

gains less than five are not appropriate--see text.

Improved slew rate (4.6V/

s) versus

OPA337 (1.2V/

s) in unity gain.

OPA337, OPA2337
OPA338, OPA2338

Figure 4 shows a compensation technique using an inverting
configuration. The low frequency gain is set by the resistor
ratio while the high frequency gain is set by the capacitor
ratio. As with the noninverting circuit, for frequencies above
f

the gain must be greater than the recommended minimum

stable gain for the op amp.

The capacitor values shown are the nearest standard values.
Capacitor values may need to be adjusted slightly to opti-
mize performance. For more detailed information, consult
the OPA686 product data sheet.

Figure 5 shows the large-signal transient response using the
circuit given in Figure 4. As shown, the OPA338 is stable in
low gain applications and provides improved slew rate
performance when compared to the OPA337.

FIGURE 4. Inverting Compensation Circuit of OPA338 for

Low Gain.

500mV/div

OPA338

s/div

FIGURE 5. G = 2, Slew-Rate Comparison of OPA338 and

OPA337.

OPA337

Resistors R

and R

are chosen to set the desired dc signal

gain. Then the value for C

is determined as follows:

= 1/(2

)

is determined from the desired high frequency gain (G

= (G

1) · C

For a desired dc gain of 2 and high frequency gain of 10, the
following resistor and capacitor values result:

= 10k

= 150pF

= 5k

= 15pF

TYPICAL APPLICATION

Figure 6 shows the OPA2337 in a typical application. The
ADS7822 is a 12-bit, micro-power sampling analog-to-
digital converter available in the tiny MSOP-8 package. As
with the OPA2337, it operates with a supply voltage as
low as +2.7V. When used with the miniature SOT23-8
package of the OPA2337, the circuit is ideal for space-
limited and low power applications. In addition, OPA2337's
high input impedance allows large value resistors to be
used which results in small physical capacitors, further
reducing circuit size. For further information, consult the
ADS7822 product data sheet.

= , C

= (G

1) · C

150pF

OPA338

OUT

10k

Where G

is the high frequency gain,

= 1 + C

Improved slew rate versus OPA337
(see Figure 5).

15pF

OPA337, OPA2337
OPA338, OPA2338

FIGURE 6. Low Power, Single-Supply, Speech Bandpass Filtered Data Acquisition System.

1/2

OPA2337E

1/2

OPA2337E

ADS7822

12-Bit A/D

GND

+IN

33pF

DCLOCK

Serial
Interface

1000pF

1.5k

20k

100k

150k

510k

51k

OUT

REF

V+

= +2.7V to 5V

CS/SHDN

1000pF

Electret

Microphone

(1)

G = 100

Passband 300Hz to 3kHz

NOTE: (1) Electret microphone
with internal transistor (FET)
powered by R

FIGURE 7. Recommended SOT23-5 and SOT23-8 Solder Footprints.

0.035

(0.889)

0.10

(2.54)

0.018

(0.457)

0.026

(0.66)

SOT23-8

(Package Drawing #348)

Refer to end of data sheet or Appendix C of Burr-Brown IC Data Book for

tolerances and detailed package drawing. For further information on solder

pads for surface-mount packages, consult Application Bulletin AB-132.

SOT23-5

(Package Drawing #331)

0.035

(0.889)

0.10

(2.54)

0.0375

(0.9525)

0.0375

(0.9525)

0.075

(1.905)

0.027

(0.686)

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