LTC6268-10/LTC6269-10 – 4GHz Ultra-Low Bias Current FET ...

LTC6268-10/LTC6269-10

4GHz Ultra-Low Bias

Current FET Input Op Amp

FEATURES

DESCRIPTION

Gain Bandwidth Product: 4GHz

nn Low Input Bias Current:

nn ¡À3fA Typ. Room Temperature

nn 4pA Max at 125¡ãC

nn Current Noise (100kHz): 7fA/¡ÌHz

nn Voltage Noise (1MHz): 4.0nV/¡ÌHz

nn Extremely Low C 0.45pF

IN

nn Rail-to-Rail Output

nn A ¡Ý10

V

nn Slew Rate: +1500V/?s, ¨C1000V/?s

nn Supply Range: 3.1V to 5.25V

nn Quiescent Current: 16.5mA

nn Operating Temp Range: ¨C40¡ãC to 125¡ãC

nn Single in 8-Lead SO-8, 6-Lead TSOT-23 Packages

nn Dual in 8-Lead MS8, 3mm ¡Á 3mm 10-Lead

DFN 10 Packages

The LTC?6268-10/LTC6269-10 is a single/dual 4GHz FETinput operational amplifier with extremely low input bias

current and low input capacitance. It also features low

input-referred current noise and voltage noise making it an

ideal choice for high speed transimpedance amplifiers, and

high-impedance sensor amplifiers. It is a decompensated

op amp that is gain-of-10 stable.

nn

APPLICATIONS

It operates on 3.1V to 5.25V supply and consumes 16.5mA

per amplifier. A shutdown feature can be used to lower

power consumption when the amplifier is not in use.

The LTC6268-10 single op amp is available in 8-lead SOIC

and 6-lead SOT-23 packages. The SOIC package includes

two unconnected pins which can be used to create an input

pin guard ring to protect against board leakage currents.

The LTC6269-10 dual op amp is available in 8-lead MSOP

with exposed pad and 3mm ¡Á 3mm 10-lead DFN packages.

They are fully specified over the ¨C40¡ãC to 85¡ãC and the

¨C40¡ãC to 125¡ãC temperature ranges.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Transimpedance Amplifiers

nn ADC Drivers

nn Photomultiplier Tube Post-Amplifier

nn Low I

BIAS Circuits

nn

TYPICAL APPLICATION

20k¦¸ TIA Frequency Response

20k¦¸ Gain 210MHz Transimpedance Amplifier

90

87

2.5V

81

2.5V

PD

¨C

IPD

84

PARASITIC

FEEDBACK C

LTC6268-10

+

VOUT = ¨CIPD ? 20k

BW = 210MHz

GAIN (dB?)

20k¦¸

78

75

72

69

66

¨C2.5V

63

626810 TA01

PD = OSI OPTOELECTRONICS, FCI-125G-006

60

10k

100k

1M

10M

FREQUENCY (Hz)

100M

1G

626810 TA01b

626810f

For more information LTC6268-10

1

LTC6268-10/LTC6269-10

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Supply Voltage V+ to V¨C............................................5.5V

Input Voltage ................................V¨C ¨C 0.2V to V+ + 0.2V

Input Current (+IN, ¨CIN) (Note 2)............................ ¡À1mA

Input Current (SHDN)............................................. ¡À1mA

Output Current (IOUT ) (Note 8, 9)..........................135mA

Output Short-Circuit Duration (Note 3).... Thermally Limited

Operating Temperature Range

LTC6268-10I/LTC6269-10I....................¨C40¡ãC to 85¡ãC

LTC6268-10H/LTC6269-10H............... ¨C40¡ãC to 125¡ãC

Specified Temperature Range (Note 4)

LTC6268-10I/LTC6269-10I....................¨C40¡ãC to 85¡ãC

LTC6268-10H/LTC6269-10H............... ¨C40¡ãC to 125¡ãC

Maximum Junction Temperature........................... 150¡ãC

Storage Temperature Range................... ¨C65¡ãC to 150¡ãC

Lead Temperature S8, S6 and

MS8E (Soldering, 10 sec).................................. 300¡ãC

PIN CONFIGURATION

TOP VIEW

TOP VIEW

NC 1

8

SHDN

¨CIN 2

7

V+

+IN 3

6

OUT

NC 4

5

V¨C

6 V+

OUT 1

V¨C 2

5 SHDN

+IN 3

4 ¨CIN

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

S8 PACKAGE

8-LEAD PLASTIC SO

TJMAX = 150¡ãC, ¦ÈJA = 120¡ãC/W (NOTE 5)

TJMAX = 150¡ãC, ¦ÈJA = 192¡ãC/W (NOTE 5)

TOP VIEW

TOP VIEW

OUTA

¨CINA

+INA

V¨C

1

2

3

4

9

V¨C

8

7

6

5

V+

OUTB

¨CINB

+INB

OUTA

1

¨CINA

2

+INA

3

V¨C

4

SDA

5

MS8E PACKAGE

8-LEAD PLASTIC MSOP

TJMAX = 150¡ãC, ¦ÈJA = 40¡ãC/W (NOTE 5)

EXPOSED PAD (PIN 9) IS V¨C, IT IS RECOMMENDED TO SOLDER TO PCB

10 V+

11

V¨C

9 OUTB

8 ¨CINB

7 +INB

6 SDB

DD PACKAGE

10-LEAD (3mm ¡Á 3mm) PLASTIC DFN

TJMAX = 150¡ãC, ¦ÈJA = 43¡ãC/W (NOTE 5)

EXPOSED PAD (PIN 11) IS V¨C, IT IS RECOMMENDED TO SOLDER TO PCB

2

626810f

For more information LTC6268-10

LTC6268-10/LTC6269-10

ORDER INFORMATION

LEAD FREE FINISH

TAPE AND REEL

PART MARKING*

PACKAGE DESCRIPTION

SPECIFIED TEMPERATURE RANGE

LTC6268IS6-10#TRMPBF

LTC6268IS6-10#TRPBF

LTGQT

6-Lead Plastic TSOT-23

¨C40¡ãC to 85¡ãC

LTC6268HS6-10#TRMPBF

LTC6268HS6-10#TRPBF

LTGQT

6-Lead Plastic TSOT-23

¨C40¡ãC to 125¡ãC

LTC6268IS8-10#PBF

LTC6268IS8-10#TRPBF

626810

8-Lead Plastic SOIC

¨C40¡ãC to 85¡ãC

LTC6268HS8-10#PBF

LTC6268HS8-10#TRPBF

626810

8-Lead Plastic SOIC

¨C40¡ãC to 125¡ãC

LTC6269IMS8E-10#PBF

LTC6269IMS8E-10#TRPBF

LTGRM

8-Lead Plastic MSOP

¨C40¡ãC to 85¡ãC

LTC6269HMS8E-10#PBF

LTC6269HMS8E-10#TRPBF

LTGRM

8-Lead Plastic MSOP

¨C40¡ãC to 125¡ãC

LTC6269IDD-10#PBF

LTC6269IDD-10#TRPBF

LGRK

10-Lead Plastic DD

¨C40¡ãC to 85¡ãC

LTC6269HDD-10#PBF

LTC6269HDD-10#TRPBF

LGRK

10-Lead Plastic DD

¨C40¡ãC to 125¡ãC

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

For more information on lead free part marking, go to:

For more information on tape and reel specifications, go to:

5.0V ELECTRICAL CHARACTERISTICS

The l denotes specifications that apply over the full operating

temp?erature range, otherwise specifications are at TA = 25¡ãC, VSUPPLY = 5.0V (V+ = 5V, V¨C = 0V, VCM = mid-supply), RL = 1k¦¸, VSHDN

is unconnected.

SYMBOL PARAMETER

VOS

Input Offset Voltage

CONDITIONS

MIN

TYP

MAX

VCM = 2.75V

0.2

l

¨C0.7

¨C3

0.7

3

mV

mV

¨C1.0

¨C4.5

0.2

l

1.0

4.5

mV

mV

VCM = 4.0V

TC VOS

Input Offset Voltage Drift

VCM = 2.75V

IB

Input Bias Current

(Notes 6, 8)

VCM = 2.75V

LTC6268I-10/LTC6269I-10

LTC6268H-10/LTC6269H-10

¨C20

¨C900

¨C4

¡À3

l

l

20

900

4

fA

fA

pA

VCM = 4.0V

LTC6268I-10/LTC6269I-10

LTC6268H-10/LTC6269H-10

¨C20

¨C900

¨C4

¡À3

l

l

20

900

4

fA

fA

pA

VCM = 2.75V

LTC6268I-10/LTC6269I-10

LTC6268H-10/LTC6269H-10

¨C40

¨C450

¨C2

¡À6

l

l

40

450

2

fA

fA

pA

IOS

en

Input Offset Current (Notes 6, 8)

Input Voltage Noise Density, VCM = 2.75V

f = 1MHz

Input Voltage Noise Density, VCM = 4.0V

Input Referred Noise Voltage

Input Current Noise Density, VCM = 2.75V

Input Current Noise Density, VCM = 4.0V

RIN

Input Resistance

CIN

Input Capacitance

Differential (DC to 200MHz)

CMRR

Common Mode Rejection Ratio

VCM = 0.5V to 3.2V (PNP Side)

in

4

UNITS

4.0

nV/¡ÌHz

f = 1MHz

4.0

nV/¡ÌHz

f = 0.1Hz to 10Hz

12.6

¦ÌVP-P

f = 100kHz

7

fA/¡ÌHz

f = 100kHz

7

fA/¡ÌHz

Differential

>1000

G¦¸

Common Mode

>1000

G¦¸

0.1

pF

Common Mode (DC to 100MHz)

VCM = ¨C0.1V to 4.5V

IVR

Input Voltage Range

¦ÌV/¡ãC

Guaranteed by CMRR

0.45

pF

85

l

72

68

dB

dB

64

52

82

l

dB

dB

l

¨C0.1

4.5

V

626810f

For more information LTC6268-10

3

LTC6268-10/LTC6269-10

5.0V ELECTRICAL CHARACTERISTICS

The l denotes specifications that apply over the full operating

temp?erature range, otherwise specifications are at TA = 25¡ãC, VSUPPLY = 5.0V (V+ = 5V, V¨C = 0V, VCM = mid-supply), RL = 1k¦¸, VSHDN

is unconnected.

SYMBOL PARAMETER

CONDITIONS

PSRR

VCM = 1.0V, VSUPPLY Ranges from 3.1V to 5.25V

Power Supply Rejection Ratio

Supply Voltage Range

AV

Open Loop Voltage Gain

VOUT = 0.5V to 4.5V

MIN

TYP

95

l

78

75

l

3.1

125

40

250

l

V/mV

V/mV

10

2

21

l

V/mV

V/mV

RLOAD = 10k

RLOAD = 100

VOL

Output Swing Low (Input Overdrive 30mV)

Measured from V¨C

ISINK = 10mA

Output Swing High (Input Overdrive 30mV)

Measured from V+

ISOURCE = 10mA

140

200

mV

mV

130

200

260

mV

mV

70

140

200

mV

mV

160

270

370

mV

mV

l

ISOURCE = 25mA

l

ISC

IS

Output Short Circuit Current (Note 9)

60

40

90

l

15

9

16.5

l

18

25

mA

mA

0.39

0.85

1.5

mA

mA

2

2

12

12

?A

?A

0.75

V

Supply Current Per Amplifier

Supply Current in Shutdown

(Per Amplifier)

dB

dB

80

l

VOH

UNITS

5.25

l

ISINK = 25mA

MAX

l

ISHDN

Shutdown Pin Current

VSHDN = 0.75V

VSHDN =1.50V

l

l

VIL

SHDN Input Low Voltage

Disable

l

l

¨C12

¨C12

mA

mA

VIH

SHDN Input High Voltage

Enable. If SHDN is Unconnected, Amp is Enabled

tON

Turn On Time, Delay from SHDN Toggle to

Output Reaching 90% of Target

SHDN Toggle from 0V to 2V

360

ns

tOFF

Turn Off Time, Delay from SHDN Toggle to

Output High Z

SHDN Toggle from 2V to 0V

183

ns

GBW

Gain-Bandwidth Product (Note 8)

f = 10MHz

l

3500

4000

MHz

SR+

Slew Rate+

AV = 11 (RF = 1000, RG = 100)

VOUT = 0.5V to 4.5V, Measured 20% to 80%,

RLOAD = 500?

1100

600

1500

l

V/?s

V/?s

AV = 11 (RF = 1000, RG = 100)

VOUT = 4.5V to 0.5V, Measured 80% to 20%,

l

900

500

SR¨C

Slew Rate¨C

FPBW

Full Power Bandwidth (Note 7)

4VP-P

HD

Harmonic Distortion(HD2/HD3)

AV = 10, 10MHz. 2VP-P, VCM = 2.25V, RL = 1k,

RF = 450¦¸, RG = 50¦¸

ILEAK

Output Leakage Current in Shutdown

VSHDN = 0V, VOUT = 0V

VSHDN = 0V, VOUT = 5V

4

1.5

V

1000

V/?s

V/?s

73

MHz

¨C91/¨C96

dB

400

400

nA

nA

626810f

For more information LTC6268-10

LTC6268-10/LTC6269-10

3.3V ELECTRICAL CHARACTERISTICS

The l denotes specifications that apply over the full operating

temp?erature range, otherwise specifications are at TA = 25¡ãC, VSUPPLY = 3.3V (V+ = 3.3V, V¨C = 0V, VCM = mid-supply), RL = 1k¦¸,

VSHDN is unconnected.

SYMBOL PARAMETER

VOS

Input Offset Voltage

CONDITIONS

MIN

TYP

MAX

VCM = 1.0V

0.2

l

¨C0.7

¨C3

0.7

3

mV

mV

¨C1.0

¨C4.5

0.2

l

1.0

4.5

mV

mV

¡À3

l

l

¨C20

¨C900

¨C4

20

900

4

fA

fA

pA

VCM = 2.3V

¨C20

l

LTC6268I-10/LTC6269I-10

¨C900

l

¨C4

LTC6268H-10/LTC6269H-10

¡À3

20

900

4

fA

fA

pA

VCM = 1.0V

¨C40

l

LTC6268I-10/LTC6269I-10

¨C450

l

¨C2

LTC6268H-10/LTC6269H-10

¡À6

40

450

2

fA

fA

pA

VCM = 2.3V

TC VOS

Input Offset Voltage Drift

VCM = 1.0V

IB

Input Bias Current (Notes 6, 8)

VCM = 1.0V

LTC6268I-10/LTC6269I-10

LTC6268H-10/LTC6269H-10

IOS

Input Offset Current (Notes 6, 8)

en

Input Voltage Noise Density, VCM =1.0V f = 1MHz

in

4

nV/¡ÌHz

Input Voltage Noise Density, VCM = 2.3V f = 1MHz

4.0

nV/¡ÌHz

Input Referred Noise Voltage

13.5

¦ÌVP-P

Input Current Noise Density, VCM = 1.0V f = 100kHz

7

fA/¡ÌHz

Input Current Noise Density, VCM = 2.3V f = 100kHz

7

fA/¡ÌHz

f = 0.1Hz to 10Hz

Input Resistance

Differential

Common Mode

CIN

Input Capacitance

Differential (DC to 200MHz)

Common Mode (DC to 100MHz)

CMRR

Common Mode Rejection Ratio

VCM = 0.5V to 1.2V (PNP Side)

VCM = ¨C0.1V to 2.8V (Full Range)

IVR

Input Voltage Range

Guaranteed by CMRR

AV

Open Loop Voltage Gain

VOUT = 0.5V to 2.8V

Output Swing Low

(Input Overdrive 30mV).

Measured from V¨C

>1000

>1000

G¦¸

G¦¸

0.1

0.45

pF

pF

63

60

90

l

dB

dB

60

50

77

l

dB

dB

l

¨C0.1

200

l

80

40

V/mV

V/mV

10

2

18

l

V/mV

V/mV

RLOAD = 10k

RLOAD = 100

ISINK = 10mA

2.8

ISINK = 25mA

Output Swing High

(Input Overdrive 30mV).

Measured from V+

ISOURCE = 10mA

140

200

mV

mV

140

200

260

mV

mV

80

140

200

mV

mV

170

270

370

mV

mV

l

ISOURCE = 25mA

l

ISC

IS

Output Short Circuit Current (Note 9)

50

35

80

l

14.5

9

16

l

Supply Current per Amplifier

V

80

l

l

VOH

?V/C

4.0

RIN

VOL

UNITS

mA

mA

17.5

25

mA

mA

626810f

For more information LTC6268-10

5

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