ANALOG DEVICES OP221 Service Manual

Dual Low Power Operational Amplifier,

8

7

6

5

1

2

3

4

NC = NO CONNECT

+IN A

V–

+IN B

–IN A

OUT A

V+

OUT B–IN B

a

FEATURES
Excellent TCV
Low Input Offset Voltage, 150 ␮V Max
Low Supply Current, 550 ␮A Max
Single Supply Operation, 5 V to 30 V
Low Input Offset Voltage Drift, 0.75 ␮V/ⴗC
High Open-Loop Gain, 1500 V/mV Min
High PSRR, 3 ␮V/V
Wide Common-Mode Voltage

Range, V– to within 1.5 V of V+
Pin Compatible with 1458, LM158, LM2904
Available in Die Form

GENERAL DESCRIPTION

The OP221 is a monolithic dual operational amplifier that can
be used either in single or dual supply operation. The wide
supply voltage range, wide input voltage range, and low supply
current drain of the OP221 make it well-suited for operation
from batteries or unregulated power supplies.

The excellent specifications of the individual amplifiers combined
with the tight matching and temperature tracking between channels

Match, 2 ␮V/ⴗC Max

OS

Single or Dual Supply

OP221

PIN CONNECTIONS

8-Lead SOIC

(S-Suffix)

provide high performance in instrumentation amplifier designs.
The individual amplifiers feature very low input offset voltage,
low offset voltage drift, low noise voltage, and low bias current.
They are fully compensated and protected.

Matching between channels is provided on all critical parameters
including input offset voltage, tracking of offset voltage vs. tem­perature, non-inverting bias currents, and common-mode rejection.

SIMPLIFIED SCHEMATIC

Q3 Q4

–IN

+IN

Q1

Q5

*

NULL

*

ACCESSIBLE IN CHIP FORM ONLY

Q2

Q7

Q6

REV. C

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.

V+

Q11

Q12

Q26

Q9 Q10

Q4

Q13

Q33

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2002

Q28

OUTPUT

Q27

Q29

V–

OP221–SPECIFICATIONS

(Electrical Characteristics at Vs = ⴞ2.5 V to ⴞ15 V, TA = 25ⴗC, unless otherwise noted.)

OP221G

Parameter Symbol Conditions Min Typ Max Unit

Input Offset Voltage V

OS

250 500 mV

Input Offset Current Ios VCM = 0 1.5 7 nA

Input Bias Current I

B

Input Voltage Range IVR V+ = 5 V, V– = 0 V

VCM = 0 70 120 nA

1

V

= ± 15 V –15/13.5

S

0/3.5

V

Common-Mode CMRR V+ = –5 V, V– = 0 V
Rejection Ratio 0 V £ V

= ± 15 V dB

V

S

–15 V £ V

Power Supply PSRR VS = ± 2.5 V to ± 15 V 32 100
Rejection Ratio V– = 0 V, V+ = 5 V to 30 V 57 180

£ 3.5 V 75 85

CM

£ 13.5 V 80 90

CM

mV/V

Large-Signal Avo VS = ±15 V, RL = 10 kW
Voltage Gain V

Output Voltage V

O

Swing R

= ±10 V 800 V/mV

O

V+ = 5 V, V– = 0 V 0.8/4 V

= 10 kW

L

VS = 15 V, RL = 10 kW±13.5

Slew Rate SR RL = 10 kW

2

0.2 0.3 V/mS

Bandwidth BW 600 kHz

Supply Current I

SY

(Both Amplifiers) VS = ± 15 V, No Load 850 900

VS = ± 2.5 V, No Load 550 650

mA

–2–

REV. C

OP221

SPECIFICATIONS

(Electrical Characteristics at VS = ⴞ2.5 V to ⴞ15 V, –40ⴗC £ TA £ +85ⴗC, unless otherwise noted.)

OP221G

Parameter Symbol Conditions Min Typ Max Unit

Average Input TCV
Offset Voltage Drift

1

Input Offset Voltage V

Input Offset Current I

Input Bias Current I

OS

B

OS

OS

VCM = 0 2 10 nA

VCM = 0 80 140 nA

Input Voltage Range IVR V+ = 5 V, V– = 0 V

V

= ± 15 V –15/13.2

S

2

0/3.2

23 mV/∞C

400 700 mV

V

Common-Mode CMRR V+ = –5 V, V– = 0 V
Rejection Ratio 0 V £ V

V

= ±15 V dB

S

–15 V £ V

Power Supply PSRR VS = ± 2.5 V to ± 15 V 57 180
Rejection Ratio V– = 0 V, V+ = 5 V to 30 V 100 320

Large-Signal A

VO

Voltage Gain V

Output Voltage V

O

Swing R

VS = ±15 V, RL = 10 kW

O

V+ = 5 V, V– = 0 V 0.9/3.7

L

£ 3.5 V 70 80

CM

£ 13.5 V 75 85

CM

= ±10 V 600

= 10 kW V

mV/V

V/mV

VS = 15 V, RL = 10 kW 13.2

Supply Current I

SY

VS = ± 2.5 V, No Load 600 750 mA

(Both Amplifiers) VS = ± 15 V, No Load 950 1000

NOTES

1

Sample tested.

2

Guaranteed by CMRR test limits.

Matching Characteristics at Vs = ⴞ15 V, TA = 25ⴗC, unless otherwise noted.

OP221G

Parameter Symbol Conditions Min Typ Max Unit

Input Offset
Voltage Match DV

OS

250 600 mV

Average Noninverting
Bias Current IB+ 120 nA

Noninverting Input I

+410nA

OS

Offset Current

Common-Mode
Rejection Ratio DCMRR V

1

Match

= –15 V to 13.5 V 72 dB

CM

Power Supply
Rejection Ratio DPSRR V

2

Match

NOTES

1

DCMRR is 20 log10 VCM/DCME, where V

2

DPSRR is: Input-Referred Differential Error

DV

S

is the voltage applied to both noninverting inputs and DCME is the difference in common-mode input-referred error.

CM

= ± 2.5 V to ± 15 V 140 mV/V

S

REV. C

–3–

(Matching Characteristics at Vs = ⴞ15 V, –40ⴗC £ TA £ +85ⴗC for OP221G, unless other-

OP221–SPECIFICATIONS

.

wise noted. G is sample tested.)

OP221G

Parameter Symbol Conditions Min Typ Max Unit

Input Offset
Voltage Match DV

Average Noninverting I

B

OS

+V

= 0 140 nA

CM

400 800 mV

Bias Current

Input Offset ICDV

OS

35mV∞C

Voltage Tracking

Noninverting Input I

+V

OS

= 0 6 12 nA

CM

Offset Current

Common-Mode
Rejection Ratio DCMRR V

1

Match

= –15 V to 13.2 V 72 80 dB

CM

Power Supply
Rejection Ratio DPSRR 140 mV/V

2

Match

NOTES

1

DCMRR is 20 log10 VCM/DCME, where V

2

DPSRR is: Input-Referred Differential Error

DV

S

is the voltage applied to both noninverting inputs and DCME is the difference in common-mode input-referred error.

CM

–4–

REV. C