Datasheet OP490FY, OP490GS, OP490GP, OP490EY Datasheet (Analog Devices)

Low Voltage Micropower

a

FEATURES
Single/Dual-Supply Operation

1.6 V to 36 V
ⴞ0.8 V to ⴞ18 V

True Single-Supply Operation; Input and Output

Voltage Ranges Include Ground
Low Supply Current: 80 ␮A Max
High Output Drive: 5 mA Min
Low Offset Voltage: 0.5 mA Max
High Open-Loop Gain: 700 V/mV Min
Outstanding PSRR: 5.6 mV/V Min
Industry Standard Quad Pinouts
Available in Die Form

GENERAL DESCRIPTION

The OP490 is a high-performance micropower quad op amp
that operates from a single supply of 1.6 V to 36 V or from
dual supplies of ± 0.8 V to ± 18 V. Input voltage range includes
the negative rail allowing the OP490 to accommodate input
signals down to ground in single-supply operation. The
OP490’s output swing also includes ground when operating
from a single supply, enabling “zero-in, zero-out” operation.

The quad OP490 draws less than 20 mA of quiescent supply
current per amplifier, but each amplifier is able to deliver
over 5 mA of output current to a load. Input offset voltage is
under 0.5 mV with offset drift below 5 mV/∞C over the military
temperature range. Gain exceeds over 700,000 and CMR is
better than 100 dB. A PSRR of under 5.6 mV/V minimizes
offset voltage changes experienced in battery-powered systems.

The quad OP490 combines high performance with the space
and cost savings of quad amplifiers. The minimal voltage and
current requirements of the OP490 make it ideal for battery­and solar-powered applications, such as portable instruments
and remote sensors.

Quad Operational Amplifier

OP490

PIN CONNECTION

14-Lead Hermetic DIP

(Y Suffix)

1

OUT A

2

–IN A

3

+IN A

4

V+

5

+IN B

6

–IN B

7

OUT B

14-Lead Plastic DIP

(P Suffix)

1

OUT A

2

–IN A

3

+IN A

V+

4

+IN B

5

–IN B

6

OUT B

7

16-Lead SOIC

(S Suffix)

1

OUT A

2

–IN A

3

+IN A

4

V+

5

+IN B

6

–IN B

7

OUT B

8

NC

NC = NO CONNECT

14

OUT D

13

–IN D

12

+IN D

11

V–

10

+IN C

9

–IN C

8

OUT C

14

OUT D

13

–IN D

12

+IN D

11

V–

10

+IN C

9

–IN C

8

OUT C

16

OUT D

15

–IN D

14

+IN D

13

V–

12

+IN C

11

–IN C

10

OUT C

9

NC

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.

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

OP490–SPECIFICATIONS

ELECTRICAL CHARACTERISTICS

(@ VS = ⴞ1.5 V to ⴞ15 V, TA = 25ⴗC, unless otherwise noted)

OP490E OP490F OP490G

Parameter Symbol Conditions Min Typ Max Min Typ Max Min Typ Max Unit

Input Offset
Voltage V

OS

0.2 0.5 0.4 0.75 0.6 1.0 mV

Input Offset
Current I

OS

VCM = 0 V 0.4 3.0 0.4 5 0.4 5 nA

Input Bias
Current I

Large Signal A

B

VO

Voltage Gain R

VCM = 0 V 4.2 15.0 4.2 20 4.2 25 nA

VS = ± 15 V, VO = ± 10 V,

= 100 kW 700 1,200 500 1,000 400 800 V/mV

L

R

= 10 kW 350 600 250 500 200 400 V/mV

L

RL = 2 kW 125 250 100 200 100 200 V/mV
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kW 200 400 125 300 100 250 V/mV
RL = 10 kW 100 180 75 140 70 140 V/mV

Input Voltage IVR V+ = 5 V, V– = 0 V 0/4 0/4 0/4 V
Range VS = ± 15 V

Output Voltage V

O

VS = ± 15 V, RL = 10 kW±13.5 ± 14.2 ±13.5 ±14.2 ± 13.5 ± 14.2 V

1

–15/+13.5 –15/+13.5 –15/+13.5 V

Swing RL = 2 kW±10.5 ± 11.5 ±10.5 ±11.5 ± 10.5 ± 11.5 V

V

OH

V+ = 5 V, V– = 0 V,
RL = 2 kW 4.0 4.2 4.0 4.2 4.0 4.2 V

V

OL

V+ = 5 V, V– = 0 V,
RL = 10 kW 100 500 100 500 100 500 mV

Common-Mode CMRR V+ = 5 V, V– = 0 V, 90 110 80 100 800 100 dB
Rejection Ratio 0 V < VCM < 4 V

VS = ± 15 V, 100 130 90 120 90 120 dB
–15 V < VCM < +13.5 V

Power Supply
Rejection Ratio PSRR 1.0 5.6 3.2 10 3.2 10 mV/V

Slew Rate SR VS = ± 15 V 5 12 5 12 5 12 V/ms

Supply Current VS = ± 1.5 V, No Load 40 60 40 60 40 60 mA
(All Amplifiers) I

SY

VS = ± 15 V, No Load 60 80 60 80 60 80 mA

Capacitive Load AV = 1 650 650 650 pF
Stability

Input Noise en p-p fO = 0.1 Hz to 10 Hz,
Voltage VS = ± 15 V 3 3 3 mV p-p

Input Resistance
Differential Mode R

IN

VS = ± 15 V 30 30 30 MW

Input Resistance
Common-Mode R

INCM

VS = ± 15 V 20 20 20 GW

Gain Bandwidth
Product GBWP AV = 1 20 20 20 kHz

Channel Separation CS fO = 10 Hz, VO = 20 V p-p 120 150 120 150 120 150 dB

VS = ± 15 V

NOTES

1

Guaranteed by CMRR test.

2

Guaranteed but not 100% tested.

Specifications subject to change without notice

2

–2–

REV. C

ELECTRICAL CHARACTERISTICS

OP490

(@ VS = ⴞ1.5 V to ⴞ15 V, –25ⴗC £ TA £ +85ⴗC for OP490E/F, –40ⴗC £ TA £ +125ⴗC for
OP490G, unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Min Typ Max Min Typ Max Unit

Input Offset
Voltage V

Average Input
Offset Voltage Drift TCV

Input Offset
Current I

Input Bias
Current I

Large Signal A
Voltage Gain R

Input Voltage IVR V+ = 5 V, V– = 0 V 0.3/5 0.3/5 0.3/5 V
Range VS = ± 15 V

Output Voltage V
Swing RL = 2 kW±10 ± 11 ± 10 ± 11 ± 10 ± 11 V

Common-Mode CMRR V+ = 5 V, V– = 0 V, 90 110 80 100 800 100 dB
Rejection Ratio 0 V < VCM < 3.5 V

Power Supply
Rejection Ratio PSRR 1.0 5.6 3.2 10 5.6 17.8 mV/V

Supply Current VS = ± 1.5 V, No Load 65 100 65 100 60 100 mA
(All Amplifiers) I

NOTE
*Guaranteed by CMRR test.

Specifications subject to change without notice

OS

VS = ± 15 V 2 5 4 4 mV/∞C

OS

OS

B

VO

VCM = 0 V 0.8 3 1.0 5 1.3 7 nA

VCM = 0 V 4.4 15 4.4 20 4.4 25 nA

VS = ± 15 V, VO = ± 10 V,

= 100 kW 500 800 350 700 300 600 V/mV

L

RL = 10 kW 250 400 175 250 150 250 V/mV
RL = 2 kW 100 200 75 150 75 125 V/mV
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kW 150 280 100 220 80 160 V/mV
RL = 10 kW 75 140 50 110 40 90 V/mV

*

O

V

OH

V

OL

SY

VS = ± 15 V, RL = 10 kW±13 ± 14 ± 13 ± 14 ± 13 ± 14 V

V+ = 5 V, V– = 0 V,
RL = 2 kW 3.9 4.1 3.9 4.1 3.9 4.1 V
V+ = 5 V, V– = 0 V,
RL = 10 kW 100 500 100 500 100 500 mV

VS = ± 15 V, 100 120 90 110 90 110 dB
–15 V < VCM < +13.5 V

VS = ± 15 V, No Load 80 120 80 120 75 120 mA

OP490E OP490F OP490G

0.32 0.8 0.6 1.35 0.8 1.5 mV

–15/+13.5 –15/+13.5 –15/+13.5 V

REV. C

–3–

OP490

–

WAFER TEST LIMITS

(@ VS = ⴞ1.5 V to ⴞ15 V, TA = 25ⴗC, unless otherwise noted)

Parameter Symbol Conditions Limits Unit

Input Offset Voltage V
Input Offset Current I
Input Bias Current I
Large Signal Voltage Gain A

OS

B

OS

VO

VCM = 0 V 5 nA max
VCM = 0 V 20 nA max
VS = ± 15 V, VO = ± 10 V,

= 100 kW 500 V/mV min

R

L

= 10 kW 250 V/mV min

R

L

0.75 mV max

V+ = 5 V, V– = 0 V 125 V/mV min
1 V < V

< 4 V, RL = 100 kW

O

Input Voltage Range IVR V+ = 5 V, V– = 0 V 0/4 V min

V

= ± 15 V* –15/+13.5 V min

S

Output Voltage Swing V

O

V

OH

V

OL

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

VS = ± 15 V

= 10 kW±13.5 V min

R

L

R

= 2 kW±10.5 V min

L

V+ = 5 V, V– = 0 V, RL = 2 kW 4.0 V min
V+ = 5 V, V– = 0 V, RL = 10 kW 500 mV max

< 4 V 80 dB min

CM

VS = ± 15 V, –15 V < VCM < +13.5 V 90 dB min

Power Supply Rejection Ratio PSRR 10 mV/V max

Supply Current (All Amplifiers) I

NOTE
*Guaranteed by CMRR test.

Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualifications through sample lot assembly and testing.

SY

VS = ± 15 V, No Load 80 mA max

+IN

V+

IN

OUTPUT

V–

Figure 1. Simplified Schematic

–4–

REV. C

OP490

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V

Digital Input Voltage . . . . . . . . [(V–) – 20 V] to [(V+) + 20 V]

Common-Mode Input Voltage [(V–) – 20 V] to [(V+) + 20 V]

Output Short Circuit Duration . . . . . . . . . . . . . . .Continuous

Storage Temperature Range

Y and P Packages . . . . . . . . . . . . . . . . . . . –65∞C to +150∞C

Operating Temperature Range

OP490E, OP490F . . . . . . . . . . . . . . . . . . . –25∞C to +85∞C

OP490G . . . . . . . . . . . . . . . . . . . . . . . . . . . –40∞C to +85∞C

Junction Temperature (T

) . . . . . . . . . . . . . –65∞C to +150∞C

J

Lead Temperature Range (Soldering, 60 sec) . . . . . . . . 300∞C

*Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect device reliability.

Package Type

␪

* ␪

JA

JC

Unit

14-Pin Hermetic DIP (Y) 99 12 ∞C/W
14-Pin Plastic DIP (P) 76 33 ∞C/W
16-Pin SOL (S) 92 27 ∞C/W

*qJA is specified for worst case mounting conditions, i.e., qJA is specified for

device in socket for CERDIP and PDIP packages; qJA is specified for device
soldered to printed circuit board for SOL package

ORDERING GUIDE

Temperature Package Package

Model Range Description Option

OP490EY* –25∞C to +85∞C14-Lead CERDIP Y-14
OP490FY* –25∞C to +85∞C 14-Lead CERDIP Y-14
OP490GP –40∞C to +85∞C14-Lead Plastic DIP P-14
OP490GS –40∞C to +85∞C 16-Lead SOIC S-14

*Not recommended for new designs. Obsolete April 2002.

For Military processed devices, please refer to the Standard
Microcircuit Drawing (SMD) available at
www.dscc.dla.mil/programs/milspec/default.asp

SMD Part Number ADI Equivalent

5962-89670013A* OP490ATCMDA
5962-8967001CA* OP490AYMDA

*Not recommended for new designs. Obsolete April 2002.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the OP490 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.

REV. C

–5–

OP490

–Typical Performance Characteristics

0.4

VS = 15V

0.3

0.2

0.1

INPUT OFFSET VOLTAGE – mV

0

–75 125–50 –25 0 25 50

TEMPERATURE – ⴗC

75

TPC 1. Input Offset Voltage vs. Temperature

1.6

VS = 15V

1.4

1.2

1.0

0.8

0.6

INPUT OFFSET CURRENT – nA

0.4

90

80

70

60

VS = 15V

50

TOTA L SUPPLY CURRENT – ␮A

40

VS = 1.5V

30

–75 125–50 –25 0 25 50

TEMPERATURE – ⴗC

75

TPC 4. Total Supply Current vs. Temperature

600

= 25ⴗC

T

A

= 10k⍀

R

L

500

400

300

200

OPEN-LOOP GAIN – V/mV

100

25ⴗC

85ⴗC

125ⴗC

0.2
–75 125–50 –25 0 25 50

TEMPERATURE – ⴗC

75

TPC 2. Input Offset Current vs. Temperature

4.8

VS = 15V

4.6

4.4

4.2

4.0

INPUT BIAS CURRENT – nA

3.8

3.6
–75 125–50 –25 0 25 50

TEMPERATURE – ⴗC

75

TPC 3. Input Bias Current vs. Temperature

0

0305

10 15 20 25

SINGLE-SUPPLY VOLTAGE – V

TPC 5. Open-Loop Gain vs. Single-Supply Voltage

140

VS = 15V
T

= 25ⴗC

A

120

= 10k⍀

R

L

100

80

60

40

OPEN-LOOP GAIN –dB

20

0

0.1 100k1

GAIN

10 100 1k 10k

FREQUENCY – Hz

0

45

90

135

PHASE SHIFT – Degrees

180

TPC 6. Open-Loop Gain and Phase Shift vs. Frequency

–6–

REV. C

OP490

k

FREQUENCY – Hz

140

0.1 1k

COMMON-MODE REJECTION – dB

80

110100

120

40

VS = 15V
T

A

= 25ⴗC

100

60

VOLTA GE NOISE DENSITY – nV/ Hz

FREQUENCY –Hz

1k

100

1

0.1 1k110100

10

V

S

= 15V

T

A

= 25ⴗC

60

VS = 15V

= 25ⴗC

T

A

40

20

CLOSED-LOOP GAIN – dB

0

–20

10 100

100

1k 10k

FREQUENCY –Hz

TPC 7. Closed-Loop Gain vs. Frequency

6

V+ = 5V, V– = 0V
T

= 25ⴗC

A

5

4

3

120

TA = 25ⴗC

100

80

60

40

POWER SUPPLY REJECTION – dB

20

11k10

NEGATIVE SUPPLY

POSITIVE SUPPLY

100

LOAD RESISTANCE – ⍀

TPC 10. Power Supply Rejection vs. Frequency

2

OUTPUT VOLTAGE SWING – V

1

0

100 100k1k

LOAD RESISTANCE – ⍀

TPC 8. Output Voltage Swing vs. Load Resistance

16

VS = 15
T

= 25ⴗC

A

14

12

10

8

6

OUTPUT SWING – V

4

2

0

100 100k1k

POSITIVE

LOAD RESISTANCE – ⍀

TPC 9. Output Voltage Swing vs. Load Resistance

10k

TPC 11. Common-Mode Rejection vs. Frequency

NEGATIVE

10k

TPC 12. Noise Voltage Density vs. Frequency

REV. C

–7–

OP490

k

100

10

1

VOLTA GE NOISE DENSITY – nV/ Hz

0.1

0.1 1

110100

FREQUENCY –Hz

VS = 15V

= 25ⴗC

T

A

TPC 13. Current Noise Density vs. Frequency

0

VS = 15V

0

T

= 25ⴗC

A

A

= 1

V

R

= 10k⍀

L

0

= 500pF

C

L

0

0

0

VS = 15V
T

= 25ⴗC

0

A

= 1

A

V

R

= 10k⍀

L

0

= 500pF

C

L

0

0

0

VOLTA G E – 5V/DIV

0

0

0

000

00000000

TIME – 1ms/DIV

TPC 15. Large-Signal Transient Response

0

VOLTA G E – 20mV/DIV

0

0

0

000

00000000

TIME – 100␮s/DIV

TPC 14. Small-Signal Transient Response

–8–

REV. C

OP490

HOURS

4

3

0

0 1750250

LITHIUM-SULPHUR DIOXIDE CELL VOLTAGE –V

500 750

2

1

1000 1500

GND

+18V

1k⍀

–18V

14 13 12 11

D

A

2

1

34

10

5

Figure 2. Burn-In Circuit

+15V

1/4
OP490A

+15V

98

C

B

67

OP37A

APPLICATIONS INFORMATION
Battery-Powered Applications

The OP490 can be operated on a minimum supply voltage of

1.6 V, or with dual supplies of ± 0.8 V, and draws only 60 mA of
supply current. In many battery-powered circuits, the OP490
can be continuously operated for hundreds of hours before
requiring battery replacement, reducing equipment downtime,
and operating costs.

High performance portable equipment and instruments fre­quently use lithium cells because of their long shelf-life, light
weight, and high energy density relative to older primary cells.
Most lithium cells have a nominal output voltage of 3 V and are
noted for a flat discharge characteristic. The low supply current

V2

–15V

V

IN

100⍀ 10k⍀

1/4
OP490B

–15V

V1

20V p-p @ 10Hz

Figure 4. Lithium-Sulphur Dioxide Cell Discharge Charac-

W

teristic with OP490 and 100 k

Loads

requirement of the OP490, combined with the flat discharge
characteristic of the lithium cell, indicates that the OP490 can
be operated over the entire useful life of the cell. Figure 4 shows
the typical discharge characteristic of a 1 Ah lithium cell power­ing an OP490 with each amplifier, in turn, driving full output
swing into a 100 kW load.

1/4
OP490C

CHANNEL SEPARATION = 20 LOG

V1

V2/1000

Single-Supply Output Voltage Range

In single-supply operation the OP490’s input and output ranges
include ground. This allows true “zero-in, zero-out” operation.
The output stage provides an active pull-down to around 0.8 V
above ground. Below this level, a load resistance of up to 1 MW
to ground is required to pull the output down to zero.

In the region from ground to 0.8 V, the OP490 has voltage gain

1/4
OP490D

equal to the data sheet specification. Output current source
capability is maintained over the entire voltage range including
ground.

Input Voltage Protection

The OP490 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. The high

Figure 3. Channel Separation Test Circuit

breakdown of the PNP transistors coupled with the protection
resistors provides a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without dam­aging the amplifier.

REV. C

–9–

OP490

Micropower Voltage-Controlled Oscillator

An OP490 in combination with an inexpensive quad CMOS
switch comprise the precision V

of Figure 5. This circuit

CO

provides triangle and square wave outputs and draws only 75 mA
from a 5 V supply. A acts as an integrator; S1 switches the
charging current symmetrically to yield positive and negative
ramps. The integrator is bounded by B which acts as a Schmitt
trigger with a precise hysteresis of 1.67 V, set by resistors R5,
R6, and R7, and associated CMOS switches. The resulting

C1

75nF

+5V

R1

V

CONTROL

200k⍀

R2

200k⍀

100k⍀

R3

2

3

R4
200k⍀

IN/OUT

1

OUT/IN

213

OUT/IN

312

IN/OUT

4

CONT

5

CONT

69

V

SS

78

4

11

1

1/4
OP490E
A

S1

S2

S3

S4

TRIANGLE

OUT

V

DD

CONT

CONT

IN/OUT

OUT/IN

OUT/IN

IN/OUT

output of A is a triangle wave with upper and lower levels of

3.33 V and 1.67 V. The output of B is a square wave with almost
rail-to-rail swing. With the components shown, frequency of
operation is given by the equation:

fV Volts Hz V

=

OUT CONTROL

¥ 10 /

()

but this is easily changed by varying C1. The circuit operates
well up to a few hundred hertz.

+5V

R5

200k⍀

6

7

5

1/4
OP490E
B

+5V

R8

200k⍀

+5V

14

11

10

+5V

R6

200k⍀

R7
200k⍀

SQUARE
OUT

Figure 5. Micropower Voltage Controlled Oscillator

–10–

REV. C

OP490

Micropower Single-Supply Quad Voltage-Output 8-Bit DAC

The circuit of Figure 6 uses the DAC8408 CMOS quad 8-bit
DAC, and the OP490 to form a single-supply quad voltage-output
DAC with a supply drain of only 140 mA. The DAC8408 is used
in voltage switching mode and each DAC has an output resistance

4

5

6

I

OUT1A

I

OUT2A/2B

I

OUT1B

DAC A
1/4

DAC8408

DAC B
1/4

DAC8408

V

A

REF

V

B

REF

REFERENCE

VOLTA G E

1.5V

(ª10 kW) independent of the digital input code. The output
amplifiers act as buffers to avoid loading the DACs. The 100 kW
resistors ensure that the OP490 outputs will swing below 0.8 V
when required.

+5V

4

2

1

22

1/4
OP490E
A

6

58

1/4

11

7

OP490E
B

R1
100k⍀

R2
100k⍀

V

A

OUT

V

B

OUT

DAC DATA BUS
PIN9(LSB) – 16(MSB)

DIGITAL

CONTROL

SIGNALS

25

24

23

17

18

19

20

I

OUT1C

I

OUT2C/2D

I

OUT1D

A/B

R/W

DS1

DS2

DAC C
1/4

DAC8408

21

DAC D
1/4

DAC8408

DAC8408ET

DGND

28

13

14

V

REF

C

1227

1/4
OP490E
C

9

8

V

REF

D

1021

1/4
OP490E
D

R3
100k⍀

R4
100k⍀

V

C

OUT

V

D

OUT

OP490EY

REV. C

Figure 6. Micropower Single-Supply Quad Voltage Output 8-Bit DAC

–11–

OP490

R5

5k⍀

+15V

–15V

1/4
OP490E

4

B

11

1

R1

1k⍀

2

V

IN

3

R2

9k⍀

R3

50⍀

1/4

6

5

OP490E
B

7

R4

50⍀

Figure 7. High Output Amplifier

High Output Amplifier

The amplifier shown in Figure 7 is capable of driving 25 V p-p
into a 1 kW load. Design of the amplifier is based on a bridge
configuration. A amplifies the input signal and drives the load
with the help of B. Amplifier C is a unity-gain inverter which
drives the load with help from D. Gain of the high output amplifier
with the component values shown is 10, but can easily be changed
by varying R1 or R2.

R6

5k⍀

R7

50⍀

8

9

10

1/4
OP490E
C

R8

R

50⍀

L

14

1/4

13

12

OP490E
D

where n equals the decimal equivalent of the 8-bit digital code
present at the DAC. If the digital code present at the DAC
consists of all zeros, the feedback loop will be open causing the
op amp output to saturate. The 10 MW resistors placed in paral­lel with the DAC feedback loop eliminates this problem with a
very small reduction in gain accuracy. The 2.5 V reference biases
the amplifiers to the center of the linear region providing maximum
output swing.

Single-Supply Micropower Quad Programmable Gain Amplifier

The combination of quad OP490 and the DAC8408 quad 8-bit
CMOS DAC, creates a quad programmable-gain amplifier with
a quiescent supply drain of only 140 mA. The digital code present
at the DAC, which is easily set by a microprocessor, determines
the ratio between the fixed DAC feedback resistor and the resis­tance of the DAC ladder presents to the op amp feedback loop.
Gain of each amplifier is:

V

OUT

Vn

IN

=-

256

–12–

REV. C

OP490

V

IN

V

IN

VINC

1

V

DD

RFBA

C1

0.1␮F

3

V

REF

I

OUT1A

A

2

R1

4

10M⍀

2

A

DAC A
1/4
DAC840 8

3

+5V

4

1

V

A

OUT

1/4
OP490E
A

1/4

V

REF

I

OUT1B

5I

8

B

R2
10M⍀

6

6

5

OUT2A/2B

7

B

C2

0.1␮F

RFBB

DAC B
1/4
DAC840 8

11

7

V

B

OUT

OP490E
B

25

RFBC

27

V

C

C3

0.1␮F

DAC C
1/4
DAC840 8

REF

I

OUT1C

R3

25

10M⍀

9

8

10

1/4

V

C

OUT

OP490E

OUT2C/2D

24I

C

VIND

CONTROL

SIGNALS

DIGITAL

C4

0.1␮F

22

RFBD

DAC D
1/4
DAC840 8

DAC DATA BUS
PIN9(LSB) – 16(MSB)

17

A/B

18

R/W

19

DS1

20

DS2

DAC8408ET

DGND

28

V

REF

I

OUT1D

D 21

R4
10M⍀

23

13

12

OP490EY

Figure 8. Single-Supply Micropower Quad Programmable Gain Amplifier

1/4
OP490E
D

14

+2.5V
REFERENCE
VOLTA G E

V

D

OUT

REV. C

–13–

OP490

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

14-Lead Hermetic DIP

0.005 (0.13) MIN 0.098 (2.49) MAX

14

PIN 1

17

0.100 (2.54) BSC

0.785 (19.94) MAX

0.200 (5.08)
MAX

0.200 (5.08)

0.125 (3.18)

0.023 (0.58)

0.014 (0.36)

(Y Suffix)

8

0.070 (1.78)

0.030 (0.76)

0.310 (7.87)

0.220 (5.59)

0.060 (1.52)

0.015 (0.38)

0.150
(3.81)
MIN

SEATING
PLANE

0.320 (8.13)

0.290 (7.37)

0.015 (0.38)

15

0.008 (0.20)

0

0.4133 (10.50)

0.3977 (10.00)

16

1

16-Lead SOIC

(S Suffix)

9

0.2992 (7.60)

0.2914 (7.40)

0.4193 (10.65)

8

0.3937 (10.00)

PIN 1

0.210 (5.33)
MAX

0.160 (4.06)

0.115 (2.93)

14-Lead Plastic DIP

(P Suffix)

0.795 (20.19)

0.725 (18.42)

14

1

0.100 (2.54)
BSC

0.022 (0.558)

0.014 (0.356)

0.070 (1.77)

0.045 (1.15)

8

0.280 (7.11)

0.240 (6.10)

7

0.060 (1.52)

0.015 (0.38)

0.130
(3.30)
MIN

SEATING
PLANE

0.325 (8.25)

0.300 (7.62)

0.015 (0.381)

0.008 (0.204)

0.195 (4.95)

0.115 (2.93)

PIN 1

0.0118 (0.30)

0.0040 (0.10)

0.050 (1.27)
BSC

0.1043 (2.65)

0.0926 (2.35)

0.0192 (0.49)

0.0138 (0.35)

SEATING
PLANE

0.0125 (0.32)

0.0091 (0.23)

0.0291 (0.74)

0.0098 (0.25)

8ⴗ
0ⴗ

ⴛ 45ⴗ

0.0500 (1.27)

0.0157 (0.40)

Revision History

Location Page

Data Sheet changed from REV. B to REV. C.

Deleted 28-Pin LCC (TC-Suffix) PIN CONNECTION DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Deleted ELECTRICAL CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Edits to ORDERING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

–14–

REV. C

–15–

C00308–0–4/02(C)

–16–

PRINTED IN U.S.A.