LTC2389-16 datasheet, PDF - EEWORLD Datasheet

FEATURES

n

LT6236/LT6237

Rail-to-Rail Output

215MHz, 1.1nV/√Hz

Op Amp/SAR ADC Driver

DESCRIPTION

The LT

®

6236/LT6237 are single/dual low noise, rail-to-rail

output op amps that feature 1.1nV/√Hz input referred noise

voltage density and draw only 3.5mA of supply current per

amplifier. These amplifiers combine very low noise and

supply current with a 215MHz gain bandwidth product

and a 70V/μs slew rate. Low noise, fast settling time and

low offset voltage make this amplifier optimal to drive

low noise, high speed SAR ADCs. The LT6236 includes a

shutdown feature that can be used to reduce the supply

current to less than 10μA.

This amplifier family has an output that swings within

50mV of either supply rail to maximize the signal dynamic

range in low supply applications and is specified on 3.3V,

5V and ±5V supplies.

The LT6236/LT6237 are upgrades to the LT6230/LT6231,

offering similar performance with reduced wideband noise

beyond 100kHz.

L,

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

ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property

of their respective owners.

Low Noise: 1.1nV/√Hz

Low Supply Current: 3.5mA/Amp Max

Low Offset Voltage: 350μV Max

Fast Settling Time: 570ns to 18-Bit, 2V

P-P

Output

Low Distortion: THD = –116.8dB at 2kHz

Wide Supply Range: 3V to 12.6V

Output Swings Rail-to-Rail

215MHz Gain-Bandwidth Product

Specified Temperature Range: –40°C to 125°C

LT6236 Shutdown to 10μA Max

LT6236 in Low Profile (1mm) ThinSOT™ Package

Dual LT6237 in 3mm

×

3mm 8-Lead DFN and 8-Lead

MSOP Packages

APPLICATIONS

n

16-Bit and 18-Bit SAR ADC Drivers

Active Filters

Low Noise, Low Power Signal Processing

TYPICAL APPLICATION

Differentially Driving a SAR ADC

V

S+

= 6V

IN

+

LT6237 Driving LTC2389-18 f

IN

= 2kHz,

–1dBFS, 32768-Point FFT

0

V

OUT

= 7.3V

P-P

–10

HD2 = –129.5dBc

–20

HD3 = –118.7dBc

–30

SFDR = 117.7dB

–40

THD = –116.8dB

–50

SNR = 99.7dB

–60

SINAD = 98.9dB

–70

–80

–90

–100

–110

–120

–130

–140

–150

0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2

FREQUENCY (MHz)

62367 TA01b

+

1/2 LT6237

LOWPASS FILTERS

38.3Ω

270pF

49.9Ω

IN

+

LTC2389-18

270pF

38.3Ω

49.9Ω

IN

–

623637 TA01a

18-BIT

2.5Msps

–

1/2 LT6237

IN

–

+

V

S–

= –2V

AMPLITUDE (dBFS)

–

623637f

1

LT6236/LT6237

ABSOLUTE MAXIMUM RATINGS

(Note 1)

Total Supply Voltage (V

+

to V

–

) .............................. 12.6V

Input Current (Note 2) ......................................... ±40mA

Output Short-Circuit Duration (Note 3) ............ Indefinite

Operating Temperature Range (Note 4)... –40°C to125°C

Specified Temperature Range (Note 5).....–40°C to125°C

Maximum Junction Temperature .......................... 150°C

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

PIN CONFIGURATION

TOP VIEW

OUT 1

V

–

2

+IN 3

6 V

+

5

ENABLE

4 –IN

OUT A

–IN A

+IN A

V

–

1

2

3

4

9

8 V

+

7 OUT B

6 –IN B

5 +IN B

OUT A

–IN A

+IN A

V

–

1

2

3

4

TOP VIEW

8

7

6

5

V

+

OUT B

–IN B

+IN B

S6 PACKAGE

6-LEAD PLASTIC TSOT-23

T

JMAX

= 150°C,

θ

JA

= 192°C/W

DD PACKAGE

8-LEAD (3mm

×

3mm) PLASTIC DFN

T

JMAX

= 150°C,

θ

JA

= 43°C/W

UNDERSIDE METAL CONNECTED TO V

–

(PCB CONNECTION OPTIONAL)

MS8 PACKAGE

8-LEAD PLASTIC MSOP

T

JMAX

= 150°C,

θ

JA

= 273°C/W

ORDER INFORMATION

LEAD FREE FINISH

LT6236CS6#PBF

LT6236IS6#PBF

LT6236HS6#PBF

LT6237CDD#PBF

LT6237IDD#PBF

LT6237HDD#PBF

LT6237CMS8#PBF

LT6237IMS8#PBF

LT6237HMS8#PBF

TAPE AND REEL

LT6236CS6#TRPBF

LT6236IS6#TRPBF

LT6236HS6#TRPBF

LT6237CDD#TRPBF

LT6237IDD#TRPBF

LT6237HDD#TRPBF

LT6237CMS8#TRPBF

LT6237IMS8#TRPBF

LT6237HMS8#TRPBF

PART MARKING*

LTGHM

LGHN

LTGHP

PACKAGE DESCRIPTION

6-Lead Plastic TSOT-23

8-Lead (3mm

×

3mm) Plastic DFN

8-Lead (3mm

×

3mm) Plastic DFN

8-Lead (3mm

×

3mm) Plastic DFN

8-Lead Plastic MSOP

SPECIFIED

TEMPERATURE RANGE

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

0°C to 70°C

–40°C to 85°C

–40°C to 125°C

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

Consult LTC Marketing for information on nonstandard lead based finish parts.

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

http://www.linear.com/leadfree/

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

http://www.linear.com/tapeandreel/

623637f

2

LT6236/LT6237

ELECTRICAL CHARACTERISTICS

ENABLE

= 0V, unless otherwise noted.

Input Offset Voltage

SYMBOL PARAMETER

V

OS

T

A

= 25°C, V

S

= 5V, 0V; V

S

= 3.3V, 0V; V

CM

= V

OUT

= half supply,

MIN

TYP

100

50

75

100

5

0.1

MAX

500

350

450

600

10

0.9

0.6

1.7

UNIT

μV

μA

nV

P-P

nV/√Hz

pA/√Hz

MΩ

kΩ

pF

V/mV

4

2.65

115

4

85

240

185

5

90

325

250

±30

±25

±45

±40

3.15

0.2

–25

3.5

10

–75

40

190

460

350

50

200

600

400

V

dB

V

mV

mA

μA

CONDITIONS

LT6236

LT6237MS8

LT6237DD8

Input Offset Voltage Match

(Channel-to-Channel) (Note 6)

I

B

I

OS

e

n

i

n

R

IN

C

IN

A

VOL

Input Bias Current

I

B

Match (Channel-to-Channel) (Note 6)

Input Offset Current

Input Noise Voltage

Input Noise Voltage Density

Input Noise Current Density, Balanced Source

Input Noise Current Density, Unbalanced Source

Input Resistance

Input Capacitance

Large-Signal Gain

0.1Hz to 10Hz

f = 10kHz, V

S

= 5V

f = 10kHz, V

S

= 5V, R

S

= 10k

f = 10kHz, V

S

= 5V, R

S

= 10k

Common Mode

Differential Mode

Common Mode

Differential Mode

V

S

= 5V, V

O

= 0.5V to 4.5V, R

L

= 10k to V

S

/2

V

S

= 5V, V

O

= 0.5V to 4.5V, R

L

= 1k to V

S

/2

V

S

= 5V, V

O

= 1V to 4V, R

L

= 100Ω to V

S

/2

V

S

= 3.3V, V

O

= 0.65V to 2.65V, R

L

= 10k to V

S

/2

V

S

= 3.3V, V

O

= 0.65V to 2.65V, R

L

= 1k to V

S

/2

V

CM

CMRR

PSRR

V

OL

Input Voltage Range

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Minimum Supply Voltage (Note 7)

Output Voltage Swing Low (Note 8)

No Load

I

SINK

= 5mA

V

S

= 5V, I

SINK

= 20mA

V

S

= 3.3V, I

SINK

= 15mA

No Load

I

SOURCE

= 5mA

V

S

= 5V, I

SOURCE

= 20mA

V

S

= 3.3V, I

SOURCE

= 15mA

V

S

= 5V

V

S

= 3.3V

ENABLE

= V

+

– 0.35V

ENABLE

= 0.3V

Guaranteed by CMRR, V

S

= 5V, 0V

Guaranteed by CMRR, V

S

= 3.3V, 0V

V

S

= 5V, V

CM

= 1.5V to 4V

V

S

= 3.3V, V

CM

= 1.15V to 2.65V

V

S

= 3V to 10V

105

21

5.4

90

16.5

1.5

1.15

90

3

180

1.1

1

2.4

6.5

7.5

2.9

7.7

200

40

9

175

32

V

OH

Output Voltage Swing High (Note 8)

I

SC

I

S

I

ENABLE

Short-Circuit Current

Supply Current per Amplifier

Disabled Supply Current per Amplifier

ENABLE

Pin Current

623637f

3

LT6236/LT6237

ELECTRICAL CHARACTERISTICS

ENABLE

= 0V, unless otherwise noted.

SYMBOL PARAMETER

V

L

V

H

t

ON

t

OFF

GBW

f

–3db

SR

FPBW

t

S

ENABLE

Pin Input Voltage Low

ENABLE

Pin Input Voltage High

Output Leakage Current

Turn-On Time

Turn-Off Time

Gain-Bandwidth Product

–3dB Bandwidth

Slew Rate

Full-Power Bandwidth

Settling Time

ENABLE

= V

+

– 0.35V, V

O

= 1.5V to 3.5V

ENABLE

= 5V to 0V, R

L

= 1k, V

S

= 5V

ENABLE

= 0V to 5V, R

L

= 1k, V

S

= 5V

Frequency = 1MHz, V

S

= 5V

V

S

= 5V, R

L

= 100Ω

V

S

= 5V, A

V

= –1, R

L

= 1k, V

O

= 1.5V to 3.5V

V

S

= 5V, V

OUT

= 3V

P-P

(Note 9)

0.1%, V

S

= 5V, V

STEP

= 2V, A

V

= 1

0.01%

0.0015% (16-Bit)

4ppm (18-Bit)

42

4.4

V

+

– 0.35V

0.2

800

41

200

90

60

6.3

50

60

240

570

10

T

A

= 25°C, V

S

= 5V, 0V; V

S

= 3.3V, 0V; V

CM

= V

OUT

= half supply,

MIN

TYP

MAX

0.3

UNIT

V

μA

ns

μs

MHz

V/μs

MHz

ns

CONDITIONS

623637f

4

LT6236/LT6237

ELECTRICAL CHARACTERISTICS

SYMBOL

V

OS

PARAMETER

Input Offset Voltage

The

l

denotes the specifications which apply over the 0°C < T

A

< 70°C

temperature range. V

S

= 5V, 0V; V

S

= 3.3V, 0V; V

CM

= V

OUT

= half supply,

ENABLE

= 0V, unless otherwise noted.

CONDITIONS

LT6236

LT6237MS8

LT6237DD8

l

MIN

TYP

MAX

600

450

550

800

UNIT

μV

μV/°C

μA

V/mV

Input Offset Voltage Match

(Channel-to-Channel) (Note 6)

V

OS

TC

Input Offset Voltage Drift (Note 10)

LT6236

LT6237MS8

LT6237DD8

l

V

+

– 0.25V

l

0.5

0.3

0.4

2.0

1.4

2.2

11

1

0.7

I

B

I

OS

A

VOL

Input Bias Current

I

B

Match (Channel-to-Channel) (Note 6)

Input Offset Current

Large-Signal Gain

V

S

= 5V, V

O

= 0.5V to 4.5V, R

L

= 10k to V

S

/2

V

S

= 5V, V

O

= 0.5V to 4.5V, R

L

= 1k to V

S

/2

V

S

= 5V, V

O

= 1V to 4V, R

L

= 100Ω to V

S

/2

V

S

= 3.3V, V

O

= 0.65V to 2.65V, R

L

= 10k to V

S

/2

V

S

= 3.3V, V

O

= 0.65V to 2.65V, R

L

= 1k to V

S

/2

78

17

4.1

66

13

1.5

1.15

90

85

3

50

200

500

380

60

215

650

430

±25

±20

4.2

1

–85

0.3

35

3.7

4

2.65

V

CM

Input Voltage Range

Guaranteed by CMRR

V

S

= 5V, 0V

Vs = 3.3V, 0V

V

S

= 5V, V

CM

= 1.5V to 4V

V

S

= 3.3V, V

CM

= 1.15V to 2.65V

V

S

= 3V to 10V

No Load

I

SINK

= 5mA

V

S

= 5V, I

SINK

= 20mA

V

S

= 3.3V, I

SINK

= 15mA

No Load

I

SOURCE

= 5mA

V

S

= 5V, I

SOURCE

= 20mA

V

S

= 3.3V, I

SOURCE

= 15mA

V

S

= 5V

V

S

= 3.3V

ENABLE

= V

+

– 0.25V

ENABLE

= 0.3V

V

dB

V

mV

mA

μA

V

V/μs

MHz

CMRR

PSRR

V

OL

Common Mode Rejection Ratio

Power Supply Rejection Ratio

Minimum Supply Voltage (Note 7)

Output Voltage Swing Low (Note 8)

V

OH

Output Voltage Swing High (Note 8)

I

SC

I

S

I

ENABLE

V

L

V

H

SR

FPBW

Short-Circuit Current

Supply Current per Amplifier

Disabled Supply Current per Amplifier

ENABLE

Pin Current

ENABLE

Pin Input Voltage Low

ENABLE

Pin Input Voltage High

Slew Rate

Full-Power Bandwidth (Note 9)

V

S

= 5V, A

V

= –1, R

L

= 1k, V

O

= 1.5V to 3.5V

V

S

= 5V, V

OUT

= 3V

P-P

623637f

5

LTC2389-16

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