OP179(1999) 查看數據表（PDF） - Analog Devices

零件编号

产品描述 (功能)

生产厂家

OP179
(Rev.:1999)

Rail-to-Rail High Output Current Operational Amplifiers

Analog Devices 

OP179/OP279

TO TELEPHONE

LINE

1:1

R3

55⍀

ZO

110⍀

T1

6.2V

6.2V

R4

55⍀

P1

TX GAIN

ADJUST

R2

9.09k⍀

2k⍀

2

1

R5

10k⍀

A1 3

R1

10k⍀

C1

0.1␮F

TRANSMIT

TXA

R6

10k⍀ 7

6

A2 5

+5V DC

10␮F

R7

10k⍀

R8

10k⍀

R9

10k⍀

R10

10k⍀

R11

10k⍀

2

1

3 A3

R12

A1, A2 = 1/2 OP279 10k⍀

A3, A4 = 1/2 OP279

R13

10k⍀

P2

RX GAIN

R14 ADJUST

9.09k⍀

RECEIVE

RXA

6

2k⍀ C2

5 A4

7

0.1␮F

Figure 31. A Single Supply Direct Access Arrangement for

Modems

A Single Supply, Remote Strain Gage Signal Conditioner

The circuit in Figure 32 illustrates a way by which the OP179/

OP279 can be used in a +12 V single supply, 350 Ω strain gage

signal conditioning circuit. In this circuit, the OP179/OP279

serves two functions: (1) By servoing the output of the REF43’s

+2.5 V output across R1, it provides a 20 mA drive to the 350 Ω

strain gage. In this way, small changes in the strain gage pro-

duce large differential output voltages across the AMP04’s in-

puts. (2) To maximize the circuit’s dynamic range, the other

half of the OP179/OP279 is configured as a supply-splitter

connected to the AMP04’s REF terminal. Thus, tension or

compression in the application can be measured by the circuit.

+12V

2

8

1

3 +2.5V 6

REF43

0.1␮F

F+

A1 2

4

4

20mA DRIVE

S+

S–

100-ft TWISTED PAIR

BELDEN TYPE 9502

F–

350⍀

STRAIN GAGE

+12V R4 C2

1k⍀ 0.1␮F

7

CX

R1

3

1

8

AMP04 6

2

45

VO

80mV/⍀

124⍀

0.1%, LOW TCR

VO

COMMON

+12V

R2

10k⍀

6

5 A2

7 +6V

C1

10␮F

R3

10k⍀

A1, A2 = 1/2 OP279

The AMP04 is configured for a gain of 100, producing a circuit

sensitivity of 80 mV/Ω. Capacitor C2 is used across the AMP04’s

Pins 8 and 6 to provide a 16-Hz noise filter. If additional noise

filtering is required, an optional capacitor, CX, can be used

across the AMP04’s input to provide differential-mode noise

rejection.

A Single Supply, Balanced Line Driver

The circuit in Figure 33 is a unique line driver circuit topology

used in professional audio applications and has been modified

for automotive audio applications. On a single +12 V supply,

the line driver exhibits less than 0.02% distortion into a 600 Ω

load across the entire audio band (not shown). For loads greater

than 600 Ω, distortion performance improves to where the cir-

cuit exhibits less than 0.002%. The design is a transformerless,

balanced transmission system where output common-mode

rejection of noise is of paramount importance. Like the trans-

former-based system, either output can be shorted to ground for

unbalanced line driver applications without changing the circuit

gain of 1. Other circuit gains can be set according to the equa-

tion in the diagram. This allows the design to be easily config-

ured for noninverting, inverting, or differential operation.

R2

10k⍀

+12V

2

C1

22␮F 3 A1 1

VIN

R1

10k⍀

A1, A2 = 1/2 OP279

GAIN

=

R3

R2

SET: R7, R10, R11 = R2

SET: R6, R12, R13 = R3

R3

10k⍀

2

3 A2 1

R5

50⍀

R6

10k⍀

R7

10k⍀

+12V

+12V

6

7

A1 5

R8

100k⍀

R9 C2

100k⍀ 1␮F

R11 R12

10k⍀ 10k⍀

6

5 A2 7

R13

10k⍀

R14

50⍀

C3

47␮F

VO1

RL

600⍀

C4

47␮F

VO2

Figure 33. A Single Supply, Balanced Line Driver for

Automotive Applications

Figure 32. A Single Supply, Remote Strain Gage Signal

Conditioner

–10–

REV. F

Share Link: