LT1189M中文资料_数据手册_规格书

LT1189

Low Power

Video Difference Amplifier

U

DESCRIPTIO

EATURE

S

F

■

Differential or Single-Ended Gain Block (Adjustable)

The LT1189 is a difference amplifier optimized for opera-

tion on ±5V, or a single 5V supply, and gain ≥10. This

versatile amplifier features uncommitted high input im-

pedance (+) and (–) inputs, and can be used in differential

or single-ended configurations. Additionally, a second set

of inputs give gain adjustment and DC control to the

difference amplifier.

–3dB Bandwidth, A_V= ±10

Slew Rate

Low Supply Current

Output Current

CMRR at 10MHz

LT1193 Pin Out

35MHz

220V/µs

13mA

±20mA

48dB

Low Cost

The LT1189’s high slew rate, 220V/µs, wide bandwidth,

35MHz, and ±20mA output current require only 13mA of

supply current. The shutdown feature reduces the power

dissipation to a mere 15mW, and allows multiple amplifi-

ers to drive the same cable.

Single 5V Operation

Drives Cables Directly

Output Shutdown

O U

PPLICATI

Line Receivers

S

A

The LT1189 is a low power, gain of 10 stable version of the

popular LT1193, and is available in 8-pin miniDIPs and SO

packages. For lower gain applications see the LT1187

data sheet.

■

Video Signal Processing

Cable Drivers

Tape and Disc Drive Systems

U

O

TYPICAL APPLICATI

Cable Sense Amplifier for Loop Through Connections

with DC Adjust

Closed-Loop Gain vs Frequency

50

V

IN

V

= ±5V

= 1k

S

L

R

5V

40

30

20

10

0

3

2

+

–

7

CABLE

6

V

OUT

LT1189

1

8

V

DC

+

–

4

–5V

909Ω

100Ω

0.1

1

10

100

FREQUENCY (MHz)

LT1189 • TA01

LT1189 • TA02

1

LT1189

W W W

U

/O

ABSOLUTE AXI U RATI GS

PACKAGE RDER I FOR ATIO

Total Supply Voltage (V ⁺to V ^–) ............................. 18V

Differential Input Voltage ........................................ ±6V

Input Voltage .......................................................... ±V_S

Output Short Circuit Duration (Note 1) ........ Continuous

Operating Temperature Range

LT1189M..................................... – 55°C to 150°C

LT1189C............................................. 0°C to 70°C

Junction Temperature (Note 2)

Plastic Package (CN8,CS8) ......................... 150°C

Ceramic Package (CJ8,MJ8) ....................... 175°C

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

Lead Temperature (Soldering, 10 sec.)................ 300°C

TOP VIEW

ORDER PART

+/REF

–IN

1

2

3

4

8

7

6

5

–/FB

NUMBER

+

V

LT1189MJ8

LT1189CJ8

LT1189CN8

LT1189CS8

+IN

OUT

S/D

–

V

J8 PACKAGE

N8 PACKAGE

8-LEAD HERMETIC DIP 8-LEAD PLASTIC DIP

S8 PACKAGE

8-LEAD PLASTIC SOIC

LT1189 • POI01

S8 PART MARKING

1189

T_JMAX= 175°C, θ_JA= 100°C/W (J8)

_JMAX= 150°C, θ_JA= 100°C/W (N8)

_JMAX= 150°C, θ_JA= 150°C/W (S8)

T

+

5V

T_A= 25°C, (Note 3)

ELECTRICAL CHARACTERISTICS

–

V_S= ±5V, V_REF= 0V, R_FB1= 900Ω from pins 6 to 8, R_FB2= 100Ω from pin 8 to ground, R_L= R_FB1+ R_FB2= 1k, C_L≤ 10pF, pin 5 open.

LT1189M/C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

Input Offset Voltage

Either Input, (Note 4)

SOIC Package

1.0

3.0

4.0

mV

OS

I

Input Offset Current

Input Bias Current

Either Input

0.2

±0.5

30

1.0

µA

OS

±2.0

B

e

Input Noise Voltage

Input Noise Current

Input Resistance

f = 10kHz

O

nV/√Hz

pA/√Hz

kΩ

n

i

f = 10kHz

O

1.25

30

n

R

Differential

Either Input

(Note 5)

IN

C

V

Input Capacitance

2.0

pF

IN

Input Voltage Limit

±170

mV

IN LIM

Input Voltage Range

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing

–2.5

80

3.5

V

CMRR

PSRR

V

= –2.5V to 3.5V

105

90

dB

CM

V = ±2.375V to ±8V

75

dB

S

V

V = ±5V, R = 1k, A = 50

±3.8

±6.7

±6.4

±4.0

±7.0

±6.8

1.0

220

35

V

OUT

S

L

V

V = ±8V, R = 1k, A = 50

S

L

V

V = ±8V, R = 300Ω, A = 50, (Note 3)

S

L

V

G

E

Gain Error

V = ±1.0V, A = 10

3.5

75

%

V/µs

MHz

ns

O

V

SR

Slew Rate

(Note 6, 10)

150

35

FPBW

BW

Full Power Bandwidth

Small Signal Bandwidth

Rise Time, Fall Time

Propagation Delay

Overshoot

V = 2V , (Note 7)

O P-P

A = 10

35

V

t , t

r

A = 50, V = ±1.5V, 20% to 80% (Note 10)

50

f

V

O

t

R = 1k, V = ±125mV, 50% to 50%

12

ns

PD

L

O

V = ±50mV

10

%

O

t

Settling Time

3V Step, 0.1%, (Note 8)

1

µs

s

Diff A

Differential Gain

Differential Phase

Supply Current

R = 1k, A = 10, (Note 9)

0.6

0.75

13

%

V

L

V

Diff Ph

R = 1k, A = 10, (Note 9)

DEG

P-P

L

V

I

16

mA

S

–

Shutdown Supply Current

Pin 5 at V

0.8

1.5

2

LT1189

+

5V

ELECTRICAL CHARACTERISTICS ^T_A^{= 25°C, (Note 3)}

–

V_S= ±5V, V_REF= 0V, R_FB1= 900Ω from pins 6 to 8, R_FB2= 100Ω from pin 8 to ground, R_L= R_FB1+ R_FB2= 1k, C_L≤ 10pF, pin 5 open.

LT1189M/C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

µA

–

I

t

Shutdown Pin Current

Turn On Time

Pin 5 at V

5

25

S/D

on

–

Pin 5 from V to Ground, R = 1k

500

600

ns

L

–

Turn Off Time

Pin 5 from Ground to V , R = 1k

ns

off

L

5V

open.

T_A= 25°C, (Note 3)

ELECTRICAL CHARACTERISTICS

V_S⁺= 5V, V_S^–= 0V, V_REF= 2.5V, R_FB1= 900Ω from pins 6 to 8, R_FB2= 100Ω from pin 8 to V_REF, R_L= R_FB1+ R_FB2= 1k, C_L≤ 10pF, pin 5

LT1189M/C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

V

OS

Input Offset Voltage

Either Input, (Note 4)

SOIC Package

1.0

3.0

5.0

mV

I

Input Offset Current

Either Input

0.2

1.0

±2.0

3.5

µA

V

OS

Input Bias Current

±0.5

B

Input Voltage Range

Common-Mode Rejection Ratio

Output Voltage Swing

2.0

80

CMRR

V

CM

= 2.0V to 3.5V

100

4.0

0.15

175

30

dB

V

R = 300Ω to Ground

V

High

Low

3.6

OUT

L

OUT

(Note 3)

0.4

SR

Slew Rate

V = 1.5V to 3.5V

O

V/µs

MHz

mA

BW

Small-Signal Bandwidth

Supply Current

A = 10

V

I

12

15

1.5

25

S

–

Shutdown Supply Current

Shutdown Pin Current

Pin 5 at V

0.8

5

mA

µA

S/D

+

5V LECTR AL CHARACTERIST

E

IC

ICS ^{–55°C ≤ T}_A^{≤ 125°C, (Note 3)}

–

V_S= ±5V, V_REF= 0V, R_FB1= 900Ω from pins 6 to 8, R_FB2= 100Ω from pin 8 to ground, R_L= R_FB1+ R_FB2= 1k, C_L≤ 10pF, pin 5 open.

LT1189M

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

mV

µV/°C

µA

V

OS

Input Offset Voltage

Either Input, (Note 4)

1.0

7.5

∆V /∆T

OS

Input V Drift

10

OS

I

Input Offset Current

Either Input

0.2

1.5

±3.5

3.5

OS

B

Input Bias Current

±0.5

µA

Input Voltage Range

–2.5

80

V

CMRR

PSRR

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing

V

CM

= –2.5V to 3.5V

105

90

dB

V = ±2.375V to ±8V

S

65

dB

V

OUT

V = ±5V, R = 1k, A = 50

±3.7

±6.6

±6.4

±4.0

±7.0

±6.6

1.0

13

V

S

L

V

V = ±8V, R = 1k, A = 50

S

L

V

V = ±8V, R = 300Ω, A = 50, (Note 3)

S

L

V

G

E

Gain Error

V = ±1V, A = 10, R = 1k

6.0

17

%

mA

µA

O

V

L

I

Supply Current

S

–

Shutdown Supply Current

Shutdown Pin Current

Pin 5 at V , (Note 11)

0.8

1.5

25

–

I

Pin 5 at V

5

S/D

3

LT1189

+

5V ELECTRICAL CHARACTERISTICS ^{0°C ≤ T}_A^{≤ 70°C, (Note 3)}

–

V_S= ±5V, V_REF= 0V, R_FB1= 900Ω from pins 6 to 8, R_FB2= 100Ω from pin 8 to ground, R_L= R_FB1+ R_FB2= 1k, C_L≤ 10pF, pin 5 open.

LT1189C

TYP

SYMBOL

PARAMETER

CONDITIONS

MIN

MAX

UNITS

V

OS

Input Offset Voltage

(Note 4)

Either Input

SOIC Package

1.0

3.0

6.0

mV

∆V /∆T

Input V Drift

5.0

0.2

µV/°C

µA

V

OS

I

Input Offset Current

Either Input

1.5

±3.5

3.5

OS

B

Input Bias Current

±0.5

Input Voltage Range

–2.5

80

CMRR

PSRR

Common-Mode Rejection Ratio

Power Supply Rejection Ratio

Output Voltage Swing

V

CM

= –2.5V to 3.5V

105

90

dB

V

V = ±2.375V to ±8V

S

70

V

OUT

V = ±5V, R = 1k, A = 50

S

±3.7

±6.6

±6.4

±4.0

±7.0

±6.6

1.0

13

L

V

V = ±8V, R = 1k, A = 50

S

L

V

V = ±8V, R = 300Ω, A = 50, (Note 3)

S

L

V

G

E

Gain Error

V = ±1V, A = 10, R = 1k

O

3.5

17

%

mA

µA

V

L

I

Supply Current

S

–

Shutdown Supply Current

Shutdown Pin Current

Pin 5 at V , (Note 11)

0.8

5

1.5

25

–

I

Pin 5 at V

S/D

5V ELECTRICAL CHARACTERISTICS

open.

0°C ≤ T_A≤ 70°C, (Note 3)

V_S⁺= +5V, V_S^–= 0V, V_REF= 2.5V, R_FB1= 900Ω from pins 6 to 8, R_FB2= 100Ω from pin 8 to V_REF, R_L= R_FB1+ R_FB2= 1k, C_L≤ 10pF, pin 5

LT1189C

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

mV

µV/°C

µA

V

OS

Input Offset Voltage, (Note 4)

Either Input

1.0

3.0

∆V /∆T

OS

Input V Drift

5.0

OS

I

Input Offset Current

Either Input

0.2

1.5

±3.5

3.5

OS

B

Input Bias Current

±0.5

µA

Input Voltage Range

Common-Mode Rejection Ratio

Output Voltage Swing

2.0

80

V

CMRR

V

= 2.0V to 3.5V

100

4.0

0.15

12

dB

CM

V

OUT

R = 300Ω to Ground

V

High

Low

3.5

V

L

OUT

(Note 3)

0.4

16

I

Supply Current

mA

µA

S

Shutdown Supply Current

Shutdown Pin Current

Pin 5 at V, (Note 11)

0.8

5

1.5

25

–

Pin 5 at V

S/D

Note 1: A heat sink may be required to keep the junction temperature below

absolute maximum when the output is shorted continuously.

Note 6: Slew rate is measured between ±1V on the output, with a V step of

IN

±0.5V, A = 10 and R = 1k.

V L

Note 2: T is calculated from the ambient temperature T and power dissipation

Note 7: Full power bandwidth is calculated from the slew rate measurement:

FPBW = SR/2πVp.

Note 8: Settling time measurement techniques are shown in “Take the

Guesswork Out of Settling Time Measurements,” EDN, September 19, 1985.

J

A

P according to the following formulas:

D

LT1189MJ8, LT1189CJ8: T = T + (P × 100°C/W)

J

A

D

LT1189CN8:

LT1189CS8:

T = T + (P × 100°C/W)

J A D

T = T + (P × 150°C/W)

J

A

D

Note 9: NTSC (3.58MHz).

Note 3: When R = 1k is specified, the load resistor is R + R , but when

L

FB1

FB2

Note 10: AC parameters are 100% tested on the ceramic and plastic DIP

packaged parts (J8 and N8 suffix) and are sample tested on every lot of the SO

packaged parts (S8 suffix).

R = 300Ω is specified, then an additional 430Ω is added to the output such

L

that (R + R ) in parallel with 430Ω is R = 300Ω.

FB1

FB2

L

Note 4: V measured at the output (pin 6) is the contribution from both input

OS

Note 11: See Application section for shutdown at elevated temperatures. Do

pair, and is input referred.

not operate shutdown above T > 125°C.

J

Note 5: V

is the maximum voltage between –V and +V (pin 2 and

IN LIM

IN IN

pin 3) for which the output can respond.

4

LT1189

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Input Bias Current vs

Common-Mode Voltage vs

Temperature

Common-Mode Voltage

Input Bias Current vs Temperature

+

V

100

0

3.0

2.5

V

= ±5V

S

V = ±5V

S

+

–0.5

–1.0

–1.5

–2.0

V

= 1.8V TO 9V

+I

B

2.0

1.5

1.0

0.5

–100

–200

–300

–400

–I

B

–55°C

I

OS

2.0

1.5

1.0

0.5

25°C

+

V

= –1.8V TO –9V

0

125°C

–

–0.5

V

–50 –25

0

25

50

75

100 125

–50 –25

0

25

50

75 100 125

–5 –4 –3 –2 –1

0

1

2

3

4

5

TEMPERATURE (°C)

COMMON-MODE VOLTAGE (V)

LT1189 • TPC02

LT1189 • TPC01

LT1189 • TPC03

Equivalent Input Noise Voltage vs

Frequency

Equivalent Input Noise Current vs

Frequency

Supply Current vs Supply Voltage

200

180

160

16

14

12

10

8

12

10

8

V

T

R

= ±5V

= 25°C

= 0Ω

V

T

= ±5V

= 25°C

= 100k

S

A

S

A

R

S

–55°C

25°C

140

120

100

80

6

125°C

4

60

40

2

20

0

10

100

1k

10k

100k

0

2

4

6

8

10

100

1k

10k

100k

±SUPPLY VOLTAGE (V)

FREQUENCY (Hz)

LT1189 • TPC04

LT1189 • TPC05

LT1189 • TPC06

Shutdown Supply Current vs

Temperature

Gain Error vs Temperature

Open-Loop Gain vs Temperature

16

14

–1.2

–1.4

–1.6

–1.8

–2.0

6.0

5.0

4.0

3.0

2.0

1.0

0

V

= ±5V

= ±3V

V

= ±5V

V

A

= ±5V

S

O

R

= 1k

S

L

= ±1V

OUT

= 10

V

L

12

10

8

R = 1k

V

= –V + 0.6V

EE

S/D

R

= 500Ω

L

V

= –V + 0.4V

EE

S/D

6

V

= –V + 0.2V

EE

S/D

4

–2.2

–2.4

2

V

= –V

S/D

EE

0

–50 –25

0

25

50

75 100 125

–50 –25

0

25

50

75 100 125

–50 –25

0

25

50

75 100 125

TEMPERATURE (°C)

LT1189 • TPC09

LT1189 • TPC07

LT1189 • TPC08

5

LT1189

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Open-Loop Voltage Gain vs

Load Resistance

Gain Bandwidth Product vs

Supply Voltage

Gain, Phase vs Frequency

100

80

60

40

20

0

100

80

250

200

30

20

10

T_A= –55°C

V

= ±5V

= 25°C

= 1k

A_V= 20dB

S

A

L

V

= ±5V

= ±3V

= 25°C

S

O

A

T

PHASE

GAIN

R

T

T_A= 25°C

60

40

20

0

T_A= 125°C

150

100

–20

100k

–20

0

1M

10M

100M

0

2

4

6

8

10

100

1k

LOAD RESISTANCE (Ω)

10k

FREQUENCY (Hz)

±SUPPLY VOLTAGE (V)

LT1189 • TPC11

LT1189• TPC10

LT1189 • TPC12

Gain Bandwidth Product and

Phase Margin vs Temperature

Common-Mode Rejection Ratio

vs Frequency

Output Impedance vs Frequency

85

75

65

55

100

10

1

90

80

70

60

50

40

30

250

200

150

100

V

= ±5V

V

= ±5V

S

A

V

T

= ±5V

= 25°C

= 1k

S

L

S

T

= 25°C

R

A

= 1k

A

= 10

= 20dB

R

V

L

GAIN BANDWIDTH

PRODUCT

PHASE MARGIN

0.1

1k

10k

100k

1M

10M

100M

–50 –25

0

25

50

75 100 125

100k

1M

10M

100M

FREQUENCY (Hz)

TEMPERATURE (°C)

FREQUENCY (Hz)

LT1189 • TPC14

LT1189 • TPC13

LT1189 • TPC15

Power Supply Rejection Ratio vs

Frequency

Output Short Circuit Current vs

Temperature

± Output Swing vs Supply Voltage

+

V

80

60

40

20

0

36

35

–0.7

–0.8

–0.9

–1.0

–1.1

V

= ±5V

V

= ±5V

S

A

S

T

= 25°C

125°C

V

= ±300mV

RIPPLE

25°C

34

33

32

31

30

–55°C

+PSRR

–PSRR

R

= 1k

L

±1.8V ≤ V ≤ ±9V

125°C

25°C

S

0.5

0.4

0.3

–55°C

0.2

0.1

–20

–

1k

10k

100k

1M

10M

100M

–50 –25

0

25

50

75

100 125

0

2

4

6

8

10

V

FREQUENCY (Hz)

TEMPERATURE (°C)

±SUPPLY VOLTAGE (V)

LT1189 • TPC16

LT1189 • TPC17

LT1189 • TPC18

6

LT1189

U W

TYPICAL PERFOR A CE CHARACTERISTICS

Output Voltage Swing vs

Load Resistance

Slew Rate vs Temperature

5

300

250

200

V

= ±5V

S

–SLEW RATE

3

1

T = –55°C

A

T = 25°C

A

T = 25°C

A

+SLEW RATE

T = –55°C

A

–1

–3

–5

T = 25°C

A

V

= ±5V

= 1k

= ±2V

= 10

S

T = 25°C

A

R

L

O

V

A

10

100

LOAD RESISTANCE (Ω)

1000

–50 –25

0

25

50

75 100 125

TEMPERATURE (°C)

LT1189 • TPC19

LT1189 • TPC20

Harmonic Distortion vs

Output Level

Output Voltage Step vs

Settling Time, A_V= 10

4

2

0

–10

–20

–30

–40

–50

–60

V

T

= ±5V

= 25°C

= 1k

V

T

= ±5V

= 25°C

= 1k

S

A

R

10mV

R

L

f = 10MHz

= 10

A

V

HD

3

0

HD

2

10mV

180

–2

–4

3

100 140

220

260

300

340

0

1

2

4

SETTLING TIME (ns)

OUTPUT VOLTAGE (V

)

P-P

LT1189 • TPC22

LT1189 • TPC21

Large-Signal Transient Reponse

Small-Signal Transient Reponse

A_V= 10, R_L= 1k, +SR = 223V/µs, –SR = 232V/µs

A_V= 10, R_L= 1k, t_r= 9.40ns

LT1189 • TPC23

LT1189 • TPC24

7

LT1189

PPLICATI

O U

W

U

A

S I FOR ATIO

The primary use of the LT1189 is in converting high speed

differential signals to a single-ended output. The LT1189

videodifferenceamplifierhastwouncommittedhighinput

impedance (+) and (–) inputs. The amplifier has another

set of inputs which can be used for reference and feed-

back. Additionally, this set of inputs give gain adjust, and

DC control to the differential amplifier. The voltage gain of

the LT1189issetlikeaconventionaloperationalamplifier.

Feedback is applied to pin 8, and it is optimized for gains

of 10 or greater. The amplifier can be operated single-

ended by connecting either the (+) or (–) inputs to the

+/REF (pin 1). The voltage gain is set by the resistors:

(R_FB+ R_G)/R_G.

Power Supply Bypassing

The LT1189 is quite tolerant of power supply bypassing.

In some applications a 0.1µF ceramic disc capacitor

placed 1/2 inch from the amplifier is all that is required. In

applications requiringgood settling time, it isimportant to

use multiple bypass capacitors. A 0.1µF ceramic disc in

parallel with a 4.7µF tantalum is recommended.

Calculating the Output Offset Voltage

Both input stages contribute to the output offset voltage at

pin 6. The feedback correction forces balance in the input

stages by introducing an Input V_OSat pin 8. The complete

expression for the output offset voltage is:

Like the single-ended case, the differential voltage gain is

setbytheexternalresistors:(R_FB+R_G)/R_G. Themaximum

input differential signal for which the output will respond

is approximately ±170mV.

V_OUT=(V_OS+I_OS(R_S)+I_B(R_REF)) ×(R_FB+R_G)/R_G+I_B(R_FB)

R_Srepresents the input source resistance, typically 75Ω,

and R_REFrepresents finite source impedance from the

DC reference voltage, for V_REFgrounded, R_REF= 0Ω the

I_OSis normally a small contributor and the expression

simplifies to:

S/D

+

V

5

3

2

3

2

7

V

+

IN

V

–

IN

6

LT1189

V

OUT

1

8

1

8

OUT

+/REF

–/FB

+/REF

–/FB

V_OUT= V_OS(R_FB+ R_G)/R_G+ I_B(R_FB)

4

If R_FBis limited to 1k, the last term of the equation

contributes only 2mV since I_Bis less than 2µA.

–

V

R

FB

R

+

R

G

FB

R

G

FB

A

= +

V

R

G

A

V

= –

R

G

+

7

V

R

G

R

G

6

S/D

+

V

5

3

2

3

2

7

R

+

–

+

FB

V

IN DIFF

8

–

Q1

Q2

Q3

Q4

6

LT1189

+/REF

–/FB

LT1189

V

OUT

1

8

1

8

OUT

V

+/REF

–/FB

IN

R

G

R

G

V

+

3

2

1

REF

+

–

IN

R

E

300

4

–

E

300

–

R

REF

V

R

V

R

S

FB

345µA

350µA

R

FB

R

+R

G

R

G

FB

–

4

V

= (V

IN DIFF

+ V

)

V

O

=

V

–

V

IN

O

IN

IN DIFF

LT1189 • AI02

(

R

G

R

G

LT1189 • AI01

Figure 1. Simplified Input Stage Schematic

8

LT1189

O U

W

U

PPLICATI

A

S I FOR ATIO

High Voltage Instrumentation Amplifier Response

Instrumentation Amplifier Rejects High Voltage

20

Instrumentation amplifiers are often used to process

slowlyvaryingoutputsfromtransducers.WiththeLT1189

it is easy to make an instrumentation amplifier that can

respond to rapidly varying signals. Attenuation resistors

in front of the LT1189 allow very large common-mode

signals to be rejected while maintaining good frequency

response.Theinputcommon-modeanddifferential-mode

signals are reduced by 100:1, while the closed-loop gain

is set to be 100, thereby maintaining unity-gain input to

output. The unique topology allows for frequency re-

sponse boost by adding 150pF to pin 8 as shown.

DIFFERENTIAL-MODE RESPONSE

0

–20

COMMON-MODE RESPONSE

–40

–60

100k

1M

10M

100M

FREQUENCY (Hz)

LT1189 • AI05

3.5MHz Instrumentation Amplifier Rejects 120V_P-P

Operating with Low Closed-Loop Gain

The LT1189 has been optimized for closed-loop gains of

10orgreater. Theamplifiercanbeoperatedatmuchlower

closed-loop gains with the aid of a capacitor C_FBacross

the feedback resistor, (feedback zero). This capacitor

lowers the closed-loop 3dB bandwidth. The bandwidth

cannot be made arbitrarily low because C_FBis a short at

high frequency and the amplifier will appear configured

unity-gain. As an approximate guideline, make BW × A_VCL

= 200MHz. This expression expands to:

5V

100*

10k*

2

1

3

8

+

7

REF

V

6

IN

LT1189

–

FB

V

4

CM

120V

P-P

–5V

10k

100Ω

150pF

* 0.1% RESISTORS

WORST CASE CMRR = 48dB

LT1189 • AI03

A

VCL

= 200MHz

2π R

C

(

)(

)

FB

Output of Instrumentation Amplifier with 1MHz Square Wave

Riding on 120V_P-Pat the Input

or:

A

VCL

C

=

FB

200MHz 2π R

)( )(

(

)

FB

The effect of the feedback zero on the transient and

frequency response is shown for A_V= 4.

LT1189 • AI04

9

LT1189

O U

W

U

PPLICATI

A

S I FOR ATIO

Closed-Loop Voltage Gain vs Frequency

Reducing the Closed-Loop Bandwidth

30

Although it is possible to reduce the closed-loop band-

width by using a feedback zero, instability can occur if the

bandwidth is made too low. An alternate technique is to do

differential filtering at the input of the amplifier. This

technique filters the differential input signal, and the

differentialnoise,butdoesnotfiltercommon-modenoise.

Common-mode noise is rejected by the LT1189’s CMRR.

C

= 0pF

= 5pF

FB

20

10

0

V

= ±5V

= 25°C

= 4

S

A

T

A

–10

–20

V

R

= 900Ω

FB

= 300Ω

10MHz Bandwidth Limited Amplifier

G

100k

1M

10M

FREQUENCY (Hz)

100M

R1

5V

110Ω

3

LT1189 • AI06

+

–

7

2

SIG

eN

6

C1

68pF

V

LT1189

OUT

1

8

Small-Signal Transient Response

REF

FB

D

4

909Ω

–5V

R2

110Ω

eN

CM

A_V= 10

1

2π(R1 + R2)C1

eN

100Ω

f

=

–3dB

SIG + eN

CM

D

V

=

+

OUT

CMR

FILTER

LT1189 • AI09

Using the Shutdown Feature

The LT1189 has a unique feature that allows the amplifier

to be shutdown for conserving power, or for multiplexing

several amplifiers onto a common cable. The amplifier will

shutdown by taking pin 5 to V^–. In shutdown, the amplifier

dissipates15mWwhilemaintainingatruehighimpedance

output state of about 20kΩ in parallel with the feedback

resistors. For MUX applications, the amplifiers may be

configured inverting, non-inverting, or differential. When

theoutputisloadedwithaslittleas1kΩfromtheamplifier’s

feedback resistors, the amplifier shuts off in 600ns. This

shutoff can be under the control of HC CMOS operating

between 0V and –5V.

A_V= 4, R_FB= 910Ω, R_G= 300Ω

LT1189 • AI07

Small-Signal Transient Response

A_V= 4, R_FB= 910Ω, R_G= 300Ω, CFB = 5pF

LT1189 • AI08

10

LT1189

O U

W

U

PPLICATI

A

S I FOR ATIO

1MHz Sine Wave Gated Off with Shutdown Pin

The ability to maintain shutoff is shown on the curve Shut

down Supply Current vs Temperature in the Typical Per-

formance Characteristics section. At very high elevated

temperature it is important to hold the shutdown pin close

to the negative supply to keep the supply current from

increasing.

SHUTDOWN

V_OUT

A_V= 10, R_FB= 900Ω, R_G= 100Ω

LT1189 • AI10

U

O

TYPICAL APPLICATI

Differential Receiver MUX for Power Down Applications

15k

1.5k

CABLE 1

5V

3

2

+

–

15k

1.5k

CMOS IN

7

6

LT1189

5

1

8

V_DC

REF

FB

4

–5V

1k

CHANNEL SELECT

100Ω

1k

74HC04

V_OUT

1k

–5V

15k

1.5k

15k

1.5k

CABLE 2

5V

7

3

2

5

+

–

6

LT1189

1

8

V

DC

REF

FB

4

–5V

1% RESISTORS WORST CASE CMRR = 28dB

TYPICALLY 35dB

1k

100Ω

LT1189 • TA03

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

11

LT1189

W

SI PLIFIED SCHE ATIC

+

V

7

V

BIAS

C

M

+

–

3

2

C

FF

+V

V

6

+V

OUT

*

–

V

4

5

S/D

1 +/REF

8

–/FB

* SUBSTRATE DIODE, DO NOT FORWARD BIAS

LT1189 • SS

U

PACKAGE DESCRIPTIO ^{Dimensions in inches (millimeters) unless otherwise noted.}

0.405

(10.287)

MAX

0.005

(0.127)

MIN

0.200

(5.080)

MAX

0.290 – 0.320

(7.366 – 8.128)

CORNER LEADS OPTION

(4 PLCS)

6

5

8

7

0.015 – 0.060

(0.381 – 1.524)

0.023 – 0.045

0.025

(0.635)

RAD TYP

0.220 – 0.310

(5.588 – 7.874)

J8 Package

8-Lead Hermetic DIP

(0.58 – 1.14)

HALF LEAD

OPTION

0.008 – 0.018

(0.203 – 0.460)

0° – 15°

0.045 – 0.065

(1.14 – 1.65)

FULL LEAD

OPTION

1

2

3

4

0.045 – 0.065

(1.14 – 1.65)

0.385 ± 0.025

(9.779 ± 0.635)

0.125

3.175

MIN

0.100 ± 0.010

0.014 – 0.026

(2.540 ± 0.254)

(0.360 – 0.660)

0.400

(10.160)

MAX

0.130 ± 0.005

(3.302 ± 0.127)

0.300 – 0.320

(7.620 – 8.128)

0.045 – 0.065

(1.143 – 1.651)

8

7

6

5

4

0.065

(1.651)

TYP

N8 Package

8-Lead Plastic DIP

0.250 ± 0.010

(6.350 ± 0.254)

0.009 – 0.015

(0.229 – 0.381)

0.125

(3.175)

MIN

0.020

(0.508)

MIN

+0.025

–0.015

1

2

3

0.045 ± 0.015

(1.143 ± 0.381)

0.100 ± 0.010

(2.540 ± 0.254)

0.325

+0.635

8.255

(

)

–0.381

0.018 ± 0.003

(0.457 ± 0.076)

0.189 – 0.197

(4.801 – 5.004)

0.010 – 0.020

(0.254 – 0.508)

7

5

8

6

× 45°

0.053 – 0.069

(1.346 – 1.752)

0.004 – 0.010

(0.101 – 0.254)

0.008 – 0.010

(0.203 – 0.254)

S8 Package

8-Lead Plastic SOIC

0.228 – 0.244

(5.791 – 6.197)

0.150 – 0.157

(3.810 – 3.988)

0.016 – 0.050

0.406 – 1.270

0.050

(1.270)

BSC

0.014 – 0.019

(0.355 – 0.483)

0°– 8° TYP

1

2

3

4

BA/LT/GP 0293 10K REV 0

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7487

12

●

(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977

LINEAR TECHNOLOGY CORPORATION 1993

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