Datasheet OPA343NA-3K, OPA4343EA-2K5, OPA4343NA-250, OPA4343UA-2K5, OPA4343UA Datasheet (Burr Brown)

OPA343, 2343, 4343

1

®

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

Out D
–In D
+In D
–V
+In C
–In C
Out C
NC

Out A

–In A
+In A

+V
+In B
–In B

Out B

NC

OPA4343

SSOP-16

AD

BC

1
2
3
4

8
7
6
5

V+
Out B
–In B
+In B

Out A

–In A
+In A

V–

OPA2343

SO-8, MSOP-8

A

B

1
2
3
4

8
7
6
5

NC
V+
Output
NC

NC
–In
+In

V–

OPA343

SO-8

1
2
3

5

4

V+

–In

Out

V–

+In

OPA343

SOT-23-5

SINGLE-SUPPLY, RAIL-TO-RAIL

OPERATIONAL AMPLIFIERS

Micro

Amplifier

™

Series

© 2000 Burr-Brown Corporation PDS-1439C Printed in U.S.A. February, 2000

®

OPA4343

OPA2343

OPA4343

®

OPA343
OPA2343
OPA4343

FEATURES

● RAIL-TO-RAIL INPUT/OUTPUT

●

Micro

SIZE PACKAGES

● WIDE BANDWIDTH: 5.5MHz

● HIGH SLEW RATE: 6V/µs

● LOW THD+NOISE: 0.0007% (f = 1kHz)

● LOW QUIESCENT CURRENT: 850µA/chan

● SINGLE, DUAL, AND QUAD

APPLICATIONS

● DRIVING A/D CONVERTERS

● PCMCIA CARDS

● DATA ACQUISITION

● AUDIO PROCESSING

● COMMUNICATIONS

● ACTIVE FILTERS

● TEST EQUIPMENT

DESCRIPTION

OPA343 series rail-to-rail CMOS operational amplifi­ers are designed for low cost, miniature applications.
They are optimized for low voltage, single supply
operation. Rail-to-rail input/output and high speed
operation make them ideal for driving sampling ana­log-to-digital converters. They are also well suited for
general purpose and audio applications as well as
providing I/V conversion at the output of D/A convert­ers. Single, dual, and quad versions have identical
specifications for design flexibility.

The OPA343 series operates on a single supply as low
as 2.5V, and input common-mode voltage range extends
500mV beyond the supply rails. Output voltage swings
to within 1mV of the supply rails with a 100kΩ load.
They offer excellent dynamic response (BW = 5.5MHz,
SR = 6V/µs), yet quiescent current is only 850µA. Dual
and quad designs feature completely independent cir­cuitry for lowest crosstalk and freedom from interac­tion.

The single (OPA343) packages are the tiny 5-lead
SOT-23-5 surface mount and SO-8 surface mount.
The dual (OPA2343) comes in the miniature MSOP­8 surface mount and SO-8 surface mount. The quad
(OPA4343) packages are the space-saving SSOP-16
surface mount, SO-14 surface mount, and TSSOP-14
surface mount. All are specified from –40°C to +85°C
and operate from –55°C to +125°C. A SPICE
macromodel is available.

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For most current data sheet and other product

information, visit www.burr-brown.com

1
2
3
4
5
6
7

14
13
12
11
10

9
8

Out D
–In D
+In D
V–
+In C
–In C
Out C

Out A

–In A
+In A

V+
+In B
–In B

Out B

OPA4343

AD

BC

TSSOP-14

OPA343, 2343, 4343

2

®

PARAMETER CONDITION MIN TYP

(1)

MAX UNITS

OFFSET VOLTAGE

Input Offset Voltage V

OS

VS = 5V ±2 ±8mV

vs Temperature dV

OS

/dT ±3 µV/°C

vs Power Supply PSRR V

S

= 2.7V to 5.5V, VCM = 0V 40 200 µV/V

T

A

= –40°C to +85°C VS = 2.7V to 5.5V, VCM = 0V 200 µV/V

Channel Separation, dc 0.2 µV/V

INPUT BIAS CURRENT

Input Bias Current I

B

±0.2 ±10 pA

T

A

= –40°C to +85°C ±60 pA

Input Offset Current I

OS

±0.2 ±10 pA

NOISE

Input Voltage Noise, f = 0.1 to 50kHz 8 µVrms
Input Voltage Noise Density, f = 1kHz e

n

25 nV/√Hz

Current Noise Density, f = 1kHz i

n

3 fA/√Hz

INPUT VOLTAGE RANGE

Common-Mode Voltage Range V

CM

–0.3 (V+) +0.3 V

Common-Mode Rejection Ratio CMRR –0.3V < V

CM

< (V+) –1.8V 74 92 dB

V

S

= 5V, –0.3V < VCM < 5.3V 60 75 dB

V

S

= 2.7V, –0.3V < VCM < 3V 54 70 dB

INPUT IMPEDANCE

Differential 10

13

|| 3 Ω || pF

Common-Mode 10

13

|| 6 Ω || pF

OPEN-LOOP GAIN

Open-Loop Voltage Gain A

OL

RL = 100kΩ, 5mV < VO < (V+) –5mV 100 120 dB

T

A

= –40°C to +85°C RL = 100kΩ, 5mV < VO < (V+) –5mV 100 dB

R

L

= 10kΩ, 50mV < VO < (V+) –50mV 100 117 dB

T

A

= –40°C to +85°C RL = 10kΩ, 50mV < VO < (V+) –50mV 100 dB

R

L

= 2kΩ, 200mV < VO < (V+) –200mV 92 110 dB

T

A

= –40°C to +85°C RL = 2kΩ, 200mV < VO < (V+) –200mV 92 dB

FREQUENCY RESPONSE

Gain-Bandwidth Product GBW G = 1 5.5 MHz
Slew Rate SR V

S

= 5V, G = 1, CL = 100pF 6 V/µs

Settling Time, 0.1% V

S

= 5V, 2V Step, CL = 100pF 1 µs

0.01% V

S

= 5V, 2V Step, CL = 100pF 1.6 µs

Overload Recovery Time V

IN

• G = V

S

0.2 µs

Total Harmonic Distortion + Noise THD+N V

S

= 5V, VO = 3Vp-p

(2)

, G = 1, f = 1kHz 0.0007 %

OUTPUT

Voltage Output Swing from Rail

(3)

RL = 100kΩ, AOL ≥ 100dB 1 5 mV

T

A

= –40°C to +85°C RL = 100kΩ, AOL ≥ 100dB 5 mV

R

L

= 10kΩ, AOL ≥ 100dB 10 50 mV

T

A

= –40°C to +85°C RL = 10kΩ, A

OL

≥ 100dB 50 mV

R

L

= 2kΩ, AOL ≥ 92dB 40 200 mV

T

A

= –40°C to +85°C RL = 2kΩ, A

OL

≥ 92dB 200 mV

Short-Circuit Current I

SC

±50 mA

Capacitive Load Drive C

LOAD

See Typical Curve

POWER SUPPLY

Specified Voltage Range V

S

2.7 5 V
Operating Voltage Range 2.5 to 5.5 V
Quiescent Current (per amplifier) I

Q

IO = 0, VS = +5V 0.85 1.25 mA

T

A

= –40°C to +85°C IO = 0, VS = +5V 1.4 mA

TEMPERATURE RANGE

Specified Range –40 +85 °C
Operating Range –55 +125 °C
Storage Range –65 +150 °C
Thermal Resistance

θ

JA

SOT-23-5 Surface Mount 200 °C/W
MSOP-8 Surface Mount 150 °C/W
SO-8 Surface Mount 150 °C/W
SSOP-16 Surface Mount 100 °C/W
SO-14 Surface Mount 100 °C/W
TSSOP-14 Surface Mount 125 °C/W

NOTES: (1) V

S

= +5V. (2) V

OUT

= 0.25V to 3.25V. (3) Output voltage swings are measured between the output and power supply rails.

OPA343NA, UA

OPA2343EA, UA

OPA4343EA, UA, NA

SPECIFICATIONS: VS = 2.7V to 5.5V

Boldface limits apply over the specified temperature range, TA = –40°C to +85°C. VS = 5V.

At TA = +25°C, RL = 10kΩ connected to VS/ 2 and V

OUT

= VS/2, unless otherwise noted.

OPA343, 2343, 4343

3

®

PACKAGE/ORDERING INFORMATION

Supply Voltage ................................................................................... 7.5V

Signal Input Terminals, Voltage

(2)

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

Current

(2)

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

Output Short-Circuit

(3)

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

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

Storage Temperature ..................................................... –65°C to +150°C

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

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

NOTES: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may de­grade device reliability. (2) Input terminals are diode-clamped to the power
supply rails. Input signals that can swing more than 0.5V beyond the supply
rails should be current-limited to 10mA or less. (3) Short-circuit to ground,
one amplifier per package.

ABSOLUTE MAXIMUM RATINGS

(1)

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.

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 SPECIFIED
DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

(1)

MEDIA

Single

OPA343NA 5-Lead SOT-23-5 331 –40°C to +85°C B43 OPA343NA/250 Tape and Reel

"""""OPA343NA /3K Tape and Reel

OPA343UA SO-8 Surface-Mount 182 –40°C to +85°C OPA343UA OPA343UA Rails

"""""OPA343UA /2K5 Tape and Reel

Dual

OPA2343EA MSOP-8 Surface-Mount 337 –40°C to +85°C C43 OPA2343EA /250 Tape and Reel

"""""OPA2343EA/2K5 Tape and Reel

OPA2343UA SO-8 Surface-Mount 182 –40°C to +85°C OPA2343UA OPA2343UA Rails

"

""""OPA2343UA/2K5 Tape and Reel

Quad

OPA4343EA SSOP-16 Surface-Mount 322 –40 °C to +85°C OPA4343EA OPA4343E A /250 Tape and Reel

"

""""OPA4343EA/2K5 Tape and Reel

OPA4343UA SO-14 Surfac-Mount 235 –40°C to +85°C OPA4343UA OPA4343UA Rails

"

""""OPA4343UA/2K5 Tape and Reel

OPA4343NA TSSOP-14 Surface-Mount 357 –40°C to +85°C OPA4343NA OPA4343NA/250 Tape and Reel

" " " " " OPA4343NA/2K5 Tape and Reel

NOTE: (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 “OPA2343EA/2K5” will get a single 2500 piece Tape and Reel.

OPA343, 2343, 4343

4

®

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

CLOSED-LOOP OUTPUT IMPEDANCE

vs FREQUENCY

5k

4k

3k

2k

1k

0

Output Resistance (Ω)

Frequency (Hz)

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

G = 100

G = 10

G = 1

INPUT VOLTAGE AND CURRENT NOISE

SPECTRAL DENSITY vs FREQUENCY

10k

1k

100

10

1

1k

100

10

1

0.1

Voltage Noise (nV√Hz)

Frequency (Hz)

1 10 100 1k 10k 100k 1M

Current Noise (fA√Hz)

Current Noise

Voltage Noise

TOTAL HARMONIC DISTORTION + NOISE

vs FREQUENCY

0.1

0.01

0.001

0.0001

THD+N (%)

Frequency (Hz)

20 100 1k 10k 20k

RL = 600

G = 10

G = 1

RL = 2k

RL = 2k

RL = 10k

RL = 600

RL = 10k

OPEN-LOOP GAIN/PHASE vs FREQUENCY

0.1 1

160
140
120
100

80
60
40
20

0

–20

Voltage Gain (dB)

0

–45

–90

–135

–180

Phase (°)

Frequency (Hz)

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

POWER SUPPLY and COMMON-MODE

REJECTION vs FREQUENCY

100

80

60

40

20

0

PSRR, CMRR (dB)

Frequency (Hz)

1 10 100 1k 10k 100k 1M

PSRR

CMRR

VCM = –0.3V to (V+) –1.8V

CHANNEL SEPARATION vs FREQUENCY

Frequency (Hz)

Channel Separation (dB)

140

130

120

110

100

10010 1k 10k 100k

Dual and quad devices.
G = 1, all channels.
Quad measured channel A to D
or B to C—other combinations
yield improved rejection.

OPA343, 2343, 4343

5

®

QUIESCENT CURRENT vs TEMPERATURE

1100

1000

900

800

700

600

Quiescent Current (µA)

Temperature (°C)

–75 –50 –25 0 25 50 75 100 125

Per Amplifier

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

OPEN-LOOP GAIN AND POWER SUPPLY REJECTION

vs TEMPERATURE

130

120

110

100

90

80

A

OL

, PSRR (dB)

Temperature (°C)

–75 –50 –25 0 25 50 75 100 125

RL = 100kΩ

R

L

= 10kΩ

R

L

= 2kΩ

A

OL

PSRR

COMMON-MODE REJECTION vs TEMPERATURE

100

90

80

70

60

50

40

CMRR (dB)

Temperature (°C)

–75 –50 –25 0 25 50 75 100 125

VS = 5V, VCM = –0.3V to 5.3V
V

S

= 2.7V, VCM = –0.3V to 3V

VS = 2.7V to 5V, VCM = –0.3V to (V+) –1.8V

SHORT-CIRCUIT CURRENT vs TEMPERATURE

Temperature (°C)

Short-Circuit Current (mA)

100

90
80
70
60
50
40
30
20
10

0

–75 –50 –25 0 25 50 75 100 125

–I

SC

+I

SC

SHORT-CIRCUIT CURRENT vs SUPPLY VOLTAGE

Supply Voltage (V)

Short-Circuit Current (mA)

60

50

40

30

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

+I

SC

–I

SC

QUIESCENT CURRENT vs SUPPLY VOLTAGE

Supply Voltage (V)

Quiescent Current (µA)

900

850

800

750

700

2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0

Per Amplifier

OPA343, 2343, 4343

6

®

INPUT BIAS CURRENT vs TEMPERATURE

Input Bias Current (pA)

Temperature (°C)

–75 –50 –25 0 25 50 75 100 125

1k

100

10

1

0.1

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

INPUT BIAS CURRENT

vs INPUT COMMON-MODE VOLTAGE

Common-Mode Voltage (V)

Input Bias Current (pA)

1.0

0.8

0.6

0.4

0.2
0

–0.2
–0.4
–0.6
–0.8
–1.0

–10123456

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT

Output Current (mA)

Output Voltage (V)

5

4

3

2

1

0

0 ±10 ±20 ±30 ±40 ±50 ±60 ±70 ±80 ±90 ±100

+125°C +25°C –55°C

+125°C

+25°C

–55°C

MAXIMUM OUTPUT VOLTAGE vs FREQUENCY

10M1M

Frequency (Hz)

100k

6

5

4

3

2

1

0

Output Voltage (Vp-p)

VS = 5.5V

VS = 2.7V

Maximum output
voltage without
slew rate-induced
distortion.

OFFSET VOLTAGE DRIFT

PRODUCTION DISTRIBUTION

Percent of Amplifiers (%)

Offset Voltage Drift (µV/°C)

25

20

15

10

5

0

Typical production
distribution of
packaged units.

01234567891011121314

OFFSET VOLTAGE

PRODUCTION DISTRIBUTION

Percent of Amplifiers (%)

Offset Voltage (mV)

–8 8

30

25

20

15

10

5

0

–7 –6 –5 –4 –3 –2 –1 0 1 2 3 4 5 6 7

Typical production
distribution of
packaged units.

OPA343, 2343, 4343

7

®

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = +5V, and RL = 10kΩ connected to VS/2, unless otherwise noted.

SMALL-SIGNAL STEP RESPONSE

C

L

= 100pF

1µs/div

50mV/div

1µs/div

LARGE-SIGNAL STEP RESPONSE

CL = 100pF

1V/div

SETTLING TIME vs CLOSED-LOOP GAIN

100

10

1

0.1

Settling Time (µs)

Closed-Loop Gain (V/V)

1 10 100 1000

0.1%

0.01%

SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE

10k1000

Load Capacitance (pF)

100

60

50

40

30

20

10

0

Overshoot (%)

G = +1

G = –1

G = ±5

See text for

reducing overshoot.

OPA343, 2343, 4343

8

®

APPLICATIONS INFORMATION

OPA343 series op amps are fabricated on a state-of-the-art

0.6 micron CMOS process. They are unity-gain stable and
suitable for a wide range of general purpose applications.
Rail-to-rail input/output make them ideal for driving sam­pling A/D converters. In addition, excellent ac performance
makes them well-suited for audio applications. The class AB
output stage is capable of driving 600Ω loads connected to
any point between V+ and ground.

Rail-to-rail input and output swing significantly increases
dynamic range, especially in low supply applications.
Figure 1 shows the input and output waveforms for the
OPA343 in unity-gain configuration. Operation is from a
single +5V supply with a 10kΩ load connected to VS/2.
The input is a 5Vp-p sinusoid. Output voltage is approxi­mately 4.98Vp-p.

Power supply pins should be bypassed with 0.01µF ceramic
capacitors.

OPERATING VOLTAGE

OPA343 series op amps are fully specified from +2.7V to
+5V. However, supply voltage may range from +2.5V to
+5.5V. Parameters are guaranteed over the specified supply
range—a unique feature of the OPA343 series. In addition,
many specifications apply from –40°C to +85°C. Most
behavior remains virtually unchanged throughout the full
operating voltage range. Parameters which vary signifi­cantly with operating voltages or temperature are shown in
the typical performance curves.

RAIL-TO-RAIL INPUT

The input common-mode voltage range of the OPA343
series extends 500mV beyond the supply rails. This is
achieved with a complementary input stage—an N-channel
input differential pair in parallel with a P-channel differen­tial pair (see Figure 2). The N-channel pair is active for input
voltages close to the positive rail, typically (V+) –1.3V to
500mV above the positive supply. The P-channel pair is on
for inputs from 500mV below the negative supply to ap­proximately (V+) –1.3V.

There is a small transition region, typically (V+) –1.5V to
(V+) –1.1V, in which both input pairs are on. This 400mV
transition region can vary ±300mV with process variation.
Thus, the transition region (both stages on) can range from
(V+) –1.8V to (V+) –1.4V on the low end, up to (V+) –1.2V
to (V+) –0.8V on the high end. Within the 400mV transition
region PSRR, CMRR, offset voltage, offset drift, and THD
may be degraded compared to operation outside this region.

FIGURE 2. Simplified Schematic.

VS = +5, G = +1, RL = 10kΩ

V

IN

2V/div

FIGURE 1. Rail-to-Rail Input and Output.

V

BIAS1

V

BIAS2

VIN+

VIN–

Class AB

Control

Circuitry

V

O

V–

(Ground)

V+

Reference

Current

5

5

0

V

OUT

OPA343, 2343, 4343

9

®

5kΩ

OPAx343

10mA max

V+

V

IN

V

OUT

I

OVERLOAD

A double-folded cascode adds the signal from the two input
pairs and presents a differential signal to the class AB output
stage. Normally, input bias current is approximately 200fA,
however, input voltages exceeding the power supplies by
more than 500mV can cause excessive current to flow in or
out of the input pins. Momentary voltages greater than
500mV beyond the power supply can be tolerated if the
current on the input pins is limited to 10mA. This is easily
accomplished with an input resistor as shown in Figure 3.
Many input signals are inherently current-limited to less
than 10mA, therefore, a limiting resistor is not required.

value are just a few of the factors to consider when determin­ing stability. An op amp in unity gain configuration is the
most susceptible to the effects of capacitive load. The
capacitive load reacts with the op amp’s output resistance,
along with any additional load resistance, to create a pole in
the small-signal response which degrades the phase margin.
In unity gain, OPA343 series op amps perform well, with a
pure capacitive load up to approximately 1000pF. Increasing
gain enhances the amplifier’s ability to drive more capaci­tance. See the typical performance curve “Small-Signal
Overshoot vs Capacitive Load.”

One method of improving capacitive load drive in the unity
gain configuration is to insert a 10Ω to 20Ω resistor in series
with the output as shown in Figure 4. This significantly
reduces ringing with large capacitive loads. However, if
there is a resistive load in parallel with the capacitive load,
RS creates a voltage divider. This introduces a dc error at the
output and slightly reduces output swing. This error may be
insignificant. For instance, with RL = 10kΩ and RS = 20Ω,
there is only about a 0.2% error at the output.

DRIVING A/D CONVERTERS

OPA343 series op amps are optimized for driving medium
speed (up to 100kHz) sampling A/D converters. However,
they also offer excellent performance for higher speed
converters. The OPA343 series provides an effective means
of buffering the A/D’s input capacitance and resulting
charge injection while providing signal gain. For applica­tions requiring high accuracy, the OPA340 series is recom­mended.

Figures 5 and 6 show the OPA343 driving an ADS7816.
The ADS7816 is a 12-bit, micro-power sampling converter
in the tiny MSOP-8 package. When used with the minia­ture package options of the OPA343 series, the combina­tion is ideal for space-limited and low power applications.
For further information consult the ADS7816 data sheet.

With the OPA343 in a noninverting configuration, an RC
network at the amplifier’s output can be used to filter high
frequency noise in the signal (Figure 5). In the inverting
configuration, filtering may be accomplished with a ca­pacitor across the feedback resistor (Figure 6).

FIGURE 3. Input Current Protection for Voltages Exceeding

the Supply Voltage.

RAIL-TO-RAIL OUTPUT

A class AB output stage with common-source transistors is
used to achieve rail-to-rail output. For light resistive loads
(>50kΩ), the output voltage is typically a few millivolts
from the supply rails. With moderate resistive loads (2kΩ to
50kΩ), the output can swing to within a few tens of milli­volts from the supply rails and maintain high open-loop
gain. See the typical performanc curve “Output Voltage
Swing vs Output Current.”

CAPACITIVE LOAD AND STABILITY

OPA343 series op amps can drive a wide range of capacitive
loads. However, all op amps under certain conditions may
become unstable. Op amp configuration, gain, and load

FIGURE 4. Series Resistor in Unity-Gain Configuration Improves Capacitive Load Drive.

10Ω to

20Ω

OPAx343

V+

V

IN

V

OUT

R

S

R

L

C

L

OPA343, 2343, 4343

10

®

FIGURE 8. Transimpedance Amplifier.

FIGURE 5. OPA343 in Noninverting Configuration Driving ADS7816.

FIGURE 7. Speech Bandpass Filter.

FIGURE 6. OPA343 in Inverting Configuration Driving ADS7816.

ADS7816

12-Bit A/D

DCLOCK

D

OUT

CS/SHDN

OPA343

+5V

For improved accuracy use OPA340.

V

IN

V+

2

+In

3

–In

V

REF

8

4GND

Serial

Interface

1

0.1µF 0.1µF

7
6
5

NOTE: A/D Input = 0 to V

REF

VIN = 0V to 5V for
0V to 5V output.

RC network filters high frequency noise.

500Ω

3300pF

ADS7816

12-Bit A/D

DCLOCK

D

OUT

CS/SHDN

OPA343

+5V

For improved accuracy use OPA340.

V

IN

V+

2

+In

3

–In

V

REF

8

4GND

Serial

Interface

1

0.1µF 0.1µF

7
6
5

NOTE: A/D Input = 0 to V

REF

5kΩ5kΩ

330pF

V

IN

= 0V to –5V for 0V to 5V output.

243kΩ

10MΩ

10MΩ

1.74MΩ

220pF

47pF

200pF

1/2

OPA2343

+5V

V

IN

R

L

1/2

OPA2343

Filters 160Hz to 2.4kHz

OPA343

V

O

10MΩ

<1pF (prevents gain peaking)

+V

λ