LINEAR TECHNOLOGY LT1801, LT1802 Technical data

FEATURES

■

Gain Bandwidth Product: 80MHz

■

Input Common Mode Range Includes Both Rails

■

Output Swings Rail-to-Rail

■

Low Voltage Operation: Single or Split Supplies

2.3V to 12.6V

■

Low Quiescent Current: 2mA/Amplifier Max

■

Input Offset Voltage: 350µV Max

■

Input Bias Current: 250nA Max

■

3mm × 3mm × 0.8mm DFN Package

■

Large Output Current: 50mA Typ

■

Low Voltage Noise: 8.5nV/√Hz Typ

■

Slew Rate: 25V/µs Typ

■

Common Mode Rejection: 105dB Typ

■

Power Supply Rejection: 97dB Typ

■

Open-Loop Gain: 85V/mV Typ

■

Operating Temperature Range: –40°C to 85°C

U

APPLICATIO S

■

Low Voltage, High Frequency Signal Processing

■

Driving A/D Converters

■

Rail-to-Rail Buffer Amplifiers

■

Active Filters

■

Video Line Driver

, LTC and LT are registered trademarks of Linear Technology Corporation.

LT1801/LT1802

Dual/Quad 80MHz, 25V/µs

Low Power Rail-to-Rail Input and

Output Precision Op Amps

U

DESCRIPTIO

The LT®1801/LT1802 are dual/quad, low power, high speed rail-to-rail input and output operational amplifiers with excellent DC performance. The LT1801/LT1802 feature reduced supply current, lower input offset voltage, lower input bias current and higher DC gain than other devices with comparable bandwidth.

Typically, the LT1801/LT1802 have an input offset voltage of less than 100µV, an input bias current of less than 50nA and an open-loop gain of 85 thousand.

The LT1801/LT1802 have an input range that includes both supply rails and an output that swings within 20mV of either supply rail to maximize the signal dynamic range in low supply applications.

The LT1801/LT1802 maintain their performance for supplies from 2.3V to 12.6V and are specified at 3V, 5V and ±5V supplies. The inputs can be driven beyond the supplies without damage or phase reversal of the output.

The LT1801 is available in the MS8, SO-8 and the 3mm × 3mm × 0.8mm dual fine pitch leadless package (DFN) with the standard dual op amp pinout. The LT1802 features the standard quad op amp configuration and is available in the 14-pin plastic SO package. The LT1801/LT1802 can be used as plug-in replacements for many op amps to improve input/output range and performance.

TYPICAL APPLICATIO

3V, 1MHz, 4th Order Butterworth Filter

2.67k

220pF

47pF

–

1/2 LT1801

+

VS/2

909Ω

V

IN

U

1.1k

2.21k

470pF

22pF

–

1/2 LT1801

+

For a single version of these amplifiers, see the LT1800 data sheet.

1MHz Filter Frequency Response

0

–20

–40

–60

3V

V

OUT

18012 TA01

GAIN (dB)

–80

–100

–120

1k 100k 1M 10M 100M

10k

FREQUENCY (Hz)

18012 TA02

18012fa

1

LT1801/LT1802

TOP VIEW

S PACKAGE

14-LEAD PLASTIC SO

1

2

3

4

5

6

7

14

13

12

11

10

9

8

OUT A

–IN A

+IN A

V

+

+IN B

–IN B

OUT B

OUT D

–IN D

+IN D

V

–

+IN C

–IN C

OUT C

A

BC

D

1 2 3 4

OUT A

–IN A +IN A

V

–

8 7 6 5

V

+

OUT B –IN B +IN B

TOP VIEW

MS8 PACKAGE

8-LEAD PLASTIC MSOP

WWWU

ABSOLUTE AXI U RATI GS

Total Supply Voltage (V

–

S

Input Current (Note 2) ........................................ ± 10mA

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

Operating Temperature Range (Note 4) .. – 40°C to 85°C Specified Temperature Range (Note 5) ... –40°C to 85°C

to V

+

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

S

(Note 1)

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

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

Maximum Junction Temperature (DD Package) ... 125°C

Storage Temperature (DD Package) ..... –65°C to 125°C

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

UU

W

PACKAGE/ORDER I FOR ATIO

TOP VIEW

+

8

7

6

5

8

7

6

– +

5

V

OUT B

–IN B

+IN B

DD PART

MARKING

LAAM*

+

V

OUT B

–IN B

+IN B

–IN A

+IN A

–

V

8-LEAD (3mm × 3mm) PLASTIC DFN

T

= 125°C, θJA = 160°C/ W, (Note 10)

JMAX

ORDER PART

NUMBER

LT1801CDD LT1801IDD

OUT A

–IN A

+IN A

–

V

1OUT A

2

3

4

DD PACKAGE

1

2

3

4

TOP VIEW

– +

T

= 150°C, θJA = 250°C/ W, (Note 10)

JMAX

ORDER PART

NUMBER

LT1801CMS8 LT1801IMS8

MS8 PART

MARKING

LTYR LTYS

S8 PACKAGE

8-LEAD PLASTIC SO

T

= 150°C, θJA = 190°C/ W, (Note 10)

JMAX

ORDER PART

NUMBER

LT1801CS8 LT1801IS8

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

2

S8 PART

MARKING

1801 1801I

T

= 150°C, θJA = 160°C/ W, (Note 10)

JMAX

ORDER PART

NUMBER

LT1802CS LT1802IS

18012fa

LT1801/LT1802

ELECTRICAL CHARACTERISTICS

TA = 25°C, VS = 5V, 0V; VS = 3V, 0V; VCM = V

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

∆V

I

B

I

OS

e

n

i

n

C

IN

A

VOL

CMRR Common Mode Rejection Ratio VS = 5V, VCM = 0V to 3.5V 85 105 dB

PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V 78 97 dB

V

OL

V

OH

I

SC

I

S

GBW Gain Bandwidth Product Frequency = 2MHz 40 80 MHz SR Slew Rate VS = 5V, AV = –1, RL = 1k, VO = 4V FPBW Full Power Bandwidth VS = 5V, AV = 1, VO = 4V HD Harmonic Distortion VS = 5V, AV = 1, RL = 1k, VO = 2V t

S

∆G Differential Gain (NTSC) VS = 5V, AV = 2, RL = 150Ω 0.35 % ∆θ Differential Phase (NTSC) VS = 5V, AV = 2, RL = 150Ω 0.4 Deg

Input Offset Voltage VCM = 0V 75 350 µV

Input Offset Shift VCM = 0V to VS – 1.5V 20 185 µV

OS

Input Offset Voltage Match VCM = 0V 100 650 µV (Channel-to-Channel) (Note 9) VCM = 0V (MS8) 150 900 µV

Input Bias Current VCM = 1V 25 250 nA

Input Bias Current Match VCM = 1V 25 350 nA (Channel-to-Channel) (Note 9) VCM = V

Input Offset Current VCM = 1V 25 200 nA

Input Noise Voltage 0.1Hz to 10Hz 1.4 µV Input Noise Voltage Density f = 10kHz 8.5 nV/√Hz Input Noise Current Density f = 10kHz 1 pA/√Hz

Input Capacitance 2pF Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 35 85 V/mV

CMRR Match (Channel-to-Channel) (Note 9) VS = 5V, VCM = 0V to 3.5V 79 105 dB

Input Common Mode Range 0 V

PSRR Match (Channel-to-Channel) (Note 9) VS = 2.5V to 10V, VCM = 0V 72 97 dB Minimum Supply Voltage (Note 6) 2.3 2.5 V Output Voltage Swing Low (Note 7) No Load 16 60 mV

Output Voltage Swing High (Note 7) No Load 18 60 mV

Short-Circuit Current VS = 5V 20 45 mA

Supply Current per Amplifier 1.6 2 mA

Settling Time 0.01%, VS = 5V, V

= half supply, unless otherwise noted.

OUT

VCM = 0V (MS8) 140 500 µV VCM = 0V (DD) 175 800 µV

= V

V

CM

S

VCM = 0V (DD) 280 1200 µV

V

= V

CM

S

VCM = V

S

= 5V, VO = 1V to 4V, RL = 100Ω at VS/2 3.5 8 V/mV

V

S

= 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 30 85 V/mV

V

S

VS = 3V, VCM = 0V to 1.5V 78 97 dB

= 3V, VCM = 0V to 1.5V 72 97 dB

V

S

= 5mA 85 200 mV

I

SINK

= 20mA 225 500 mV

I

SINK

I

= 5mA 120 250 mV

SOURCE

= 20mA 450 800 mV

I

SOURCE

VS = 3V 20 40 mA

P-P

= 2V, AV = 1, RL = 1k 250 ns

STEP

0.5 3 mV

500 1500 nA

25 500 nA

25 200 nA

S

P-P

12.5 25 V/µs 2 MHz

, fC = 500kHz –75 dBc

P-P

V

18012fa

3

LT1801/LT1802

ELECTRICAL CHARACTERISTICS

0°C < TA < 70°C. VS = 5V, 0V; VS = 3V, 0V; VCM = V

OUT

The ● denotes the specifications which apply over the temperature range of

= half supply, unless otherwise noted.

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

∆V

OS

Input Offset Voltage VCM = 0V ● 125 500 µV

= 0V (MS8) ● 140 650 µV

V

CM

= 0V (DD) ● 290 950 µV

V

CM

VCM = V

S

Input Offset Shift VCM = 0V to VS – 1.5V ● 30 275 µV

OS

● 0.6 3.5 mV

Input Offset Voltage Match VCM = 0V ● 200 850 µV (Channel-to-Channel) (Note 9) V

= 0V (MS8) ● 200 1250 µV

CM

VCM = 0V (DD) ● 275 1500 µV VOS TC Input Offset Voltage Drift (Note 8) ● 1.5 5 µV/°C I

B

Input Bias Current VCM = 1V ● 50 300 nA

VCM = VS – 0.2V ● 550 2000 nA

Input Bias Current Match VCM = 1V ● 25 400 nA (Channel-to-Channel) (Note 9) V

I

OS

Input Offset Current VCM = 1V ● 25 300 nA

= VS – 0.2V ● 25 600 nA

CM

VCM = VS – 0.2V ● 25 300 nA A

VOL

Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 ● 25 75 V/mV

= 5V, VO = 1V to 4V, RL = 100Ω at VS/2 ● 2.5 6 V/mV

V

S

VS = 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 ● 20 75 V/mV CMRR Common Mode Rejection Ratio VS = 5V, VCM = 0V to 3.5V ● 82 101 dB

= 3V, VCM = 0V to 1.5V ● 74 93 dB

V

S

CMRR Match (Channel-to-Channel) (Note 9) VS = 5V, VCM = 0V to 3.5V ● 76 101 dB

= 3V, VCM = 0V to 1.5V ● 68 93 dB

V

S

Input Common Mode Range ● 0V

S

PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V ● 74 91 dB

PSRR Match (Channel-to-Channel) (Note 9) VS = 2.5V to 10V, VCM = 0V ● 68 91 dB Minimum Supply Voltage (Note 6) ● 2.3 2.5 V

V

OL

V

OH

I

SC

I

S

Output Voltage Swing Low (Note 7) No Load ● 18 80 mV

= 5mA ● 100 225 mV

I

SINK

I

= 20mA ● 300 600 mV

SINK

Output Voltage Swing High (Note 7) No Load ● 25 80 mV

= 5mA ● 150 300 mV

I

SOURCE

I

= 20mA ● 600 950 mV

SOURCE

Short-Circuit Current VS = 5V ● 20 40 mA

= 3V ● 15 30 mA

V

S

Supply Current per Amplifier ● 2 2.8 mA GBW Gain Bandwidth Product Frequency = 2MHz ● 35 75 MHz SR Slew Rate VS = 5V, AV = –1, RL = 1k, VO = 4V

P-P

● 11 22 V/µs

V

4

18012fa

LT1801/LT1802

ELECTRICAL CHARACTERISTICS

–40° C < T

< 85°C. VS = 5V, 0V; VS = 3V, 0V; VCM = V

A

The ● denotes the specifications which apply over the temperature range of

= half supply, unless otherwise noted. (Note 5)

OUT

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

Input Offset Voltage VCM = 0V ● 175 700 µV

VCM = 0V (MS8) ● 200 850 µV V

= 0V (DD) ● 320 1150 µV

CM

∆V

VCM = V

S

Input Offset Shift VCM = 0V to VS – 1.5V ● 30 300 µV

OS

● 0.75 4 mV

Input Offset Voltage Match VCM = 0V ● 200 1250 µV

(Channel-to-Channel) (Note 9) VCM = 0V (MS8) ● 280 1600 µV

V

= 0V (DD) ● 320 1800 µV

CM

VOS TC Input Offset Voltage Drift (Note 8) ● 1.5 5 µV/°C

I

B

Input Bias Current ● 50 400 nA

V

= VS – 0.2V ● 600 2250 nA

CM

Input Bias Current Match VCM = 1V ● 25 450 nA

(Channel-to-Channel) (Note 9) V

I

OS

A

VOL

Input Offset Current VCM = 1V ● 25 350 nA

Large-Signal Voltage Gain VS = 5V, VO = 0.5V to 4.5V, RL = 1k at VS/2 ● 20 65 V/mV

= VS – 0.2V ● 25 700 nA

CM

V

= VS – 0.2V ● 25 350 nA

CM

VS = 5V, VO = 1.5V to 3.5V, RL = 100Ω at VS/2 ● 2 6 V/mV V

= 3V, VO = 0.5V to 2.5V, RL = 1k at VS/2 ● 17.5 65 V/mV

S

CMRR Common Mode Rejection Ratio VS = 5V, VCM = 0V to 3.5V ● 81 101 dB

V

= 3V, VCM = 0V to 1.5V ● 73 93 dB

S

CMRR Match (Channel-to-Channel) (Note 9) VS = 5V, VCM = 0V to 3.5V ● 75 101 dB

V

= 3V, VCM = 0V to 1.5V ● 67 93 dB

S

Input Common Mode Range ● 0V

S

PSRR Power Supply Rejection Ratio VS = 2.5V to 10V, VCM = 0V ● 73 90 dB

PSRR Match (Channel-to-Channel) (Note 9) VS = 2.5V to 10V, VCM = 0V ● 67 90 dB

Minimum Supply Voltage (Note 6) VCM = VO = 0.5V ● 2.3 2.5 V

V

OL

V

OH

I

SC

I

S

Output Voltage Swing Low (Note 7) No Load ● 15 90 mV

I

= 5mA ● 105 250 mV

SINK

I

= 10mA ● 170 400 mV

SINK

Output Voltage Swing High (Note 7) No Load ● 25 90 mV

I

= 5mA ● 150 350 mV

SOURCE

I

= 10mA ● 300 700 mV

SOURCE

Short-Circuit Current VS = 5V ● 12.5 30 mA

V

= 3V ● 12.5 30 mA

S

Supply Current per Amplifier ● 2.1 3 mA

GBW Gain Bandwidth Product Frequency = 2MHz ● 25 70 MHz

SR Slew Rate VS = 5V, AV = –1, RL = 1k, VO = 4V ● 918 V/µs

V

18012fa

5

LT1801/LT1802

ELECTRICAL CHARACTERISTICS

TA = 25°C, VS = ± 5V, VCM = 0V, V

= 0V, unless otherwise noted.

OUT

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

OS

Input Offset Voltage VCM = V

V V V

∆V

Input Offset Shift VCM = V

OS

Input Offset Voltage Match VCM = V

(Channel-to-Channel) (Note 9) V

V

I

B

Input Bias Current VCM = V

V

Input Bias Current Match VCM = V

(Channel-to-Channel) (Note 9) V

I

OS

Input Offset Current VCM = V

V

Input Noise Voltage 0.1Hz to 10Hz 1.4 µV

e

n

i

n

C

IN

A

VOL

Input Noise Voltage Density f = 10kHz 8.5 nV/√Hz

Input Noise Current Density f = 10kHz 1 pA/√Hz

Input Capacitance f = 100kHz 2 pF

Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k 25 70 V/mV

V

CMRR Common Mode Rejection Ratio VCM = V

CMRR Match (Channel-to-Channel) (Note 9) VCM = V

Input Common Mode Range V

PSRR Power Supply Rejection Ratio V

PSRR Match (Channel-to-Channel) (Note 9) V

V

OL

Output Voltage Swing Low (Note 7) No Load 15 70 mV

I I

V

OH

Output Voltage Swing High (Note 7) No Load 20 80 mV

I I

I

SC

I

S

Short-Circuit Current 25 50 mA

Supply Current per Amplifier 1.8 3 mA

–

S

–

= V

(MS8) 180 750 µV

CM

S

–

= V

(DD) 260 1050 µV

CM

S

+

= V

CM

S

–

+

to V

– 1.5V 30 475 µV

S

–

S

–

= V

(MS8) 275 1300 µV

CM

S

–

= V

(DD) 325 1600 µV

CM

S

–

+ 1V 25 250 nA

S

+

= V

CM

S

–

+ 1V 20 350 nA

S

+

= V

CM

S

–

+ 1V 20 250 nA

S

+

= V

CM

S

= –2V to 2V, RL = 100Ω 2.5 7 V/mV

O

–

to 3.5V 85 109 dB

S

–

to 3.5V 79 109 dB

S

+

= 2.5V to 10V, V

S

+

= 2.5V to 10V, V

S

= 5mA 90 200 mV

SINK

= 20mA 225 500 mV

SINK

= 5mA 130 260 mV

SOURCE

= 20mA 450 850 mV

SOURCE

–

= 0V 78 97 dB

S

–

= 0V 72 97 dB

S

150 600 µV

0.7 3.5 mV

150 1000 µV

400 1500 nA

20 500 nA

20 250 nA

–

+

V

S

P-P

GBW Gain Bandwidth Product Frequency = 2MHz 70 MHz

FPBW Full Power Bandwidth VO = 8V

P-P

0.9 MHz

SR Slew Rate AV = – 1, RL = 1k, VO = ± 4V, Measured at VO = ±2V 20 V/µs

HD Harmonic Distortion AV = 1, RL = 1k, VO = 2V

t

S

Settling Time 0.01%, V

= 5V, AV = 1V, RL = 1k 300 ns

STEP

, fC = 500kHz –75 dBc

P-P

∆G Differential Gain (NTSC) AV = 2, RL = 150Ω 0.35 % ∆θ Differential Phase (NTSC) AV = 2, RL = 150Ω 0.2 Deg

V

6

18012fa

LT1801/LT1802

ELECTRICAL CHARACTERISTICS

0°C < TA < 70°C. VS = ± 5V, VCM = 0V, V

= 0V, unless otherwise noted.

OUT

The ● denotes the specifications which apply over the temperature range of

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

∆V

OS

Input Offset Voltage VCM = V

Input Offset Shift VCM = V

OS

Input Offset Voltage Match VCM = V

(Channel-to-Channel) (Note 9) V

V V V

V

–

S

–

= V

(MS8) ● 220 1000 µV

CM

S

–

= V

(DD) ● 290 1300 µV

CM

S

+

= V

CM

S

–

+

to V

– 1.5V ● 45 675 µV

S

–

S

–

= V

(MS8) ● 300 1700 µV

CM

S

–

= V

(DD) ● 340 1950 µV

CM

S

● 200 800 µV

● 0.75 4 mV

● 240 1500 µV

VOS TC Input Offset Voltage Drift (Note 8) ● 1.5 5 µV/°C

I

B

Input Bias Current VCM = V

V

Input Bias Current Match VCM = V

(Channel-to-Channel) (Note 9) V

I

OS

Input Offset Current VCM = V

V

A

VOL

Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k ● 15 55 V/mV

V

CMRR Common Mode Rejection Ratio VCM = V

CMRR Match (Channel-to-Channel) (Note 9) VCM = V

Input Common Mode Range ● V

PSRR Power Supply Rejection Ratio V

PSRR Match (Channel-to-Channel) (Note 9) V

V

OL

Output Voltage Swing Low (Note 7) No Load ● 17 80 mV

I I

V

OH

Output Voltage Swing High (Note 7) No Load ● 25 90 mV

I I

I

SC

I

S

Short-Circuit Current ● 22.5 45 mA

Supply Current per Amplifier ● 2.4 4 mA

–

+ 1V ● 30 300 nA

S

+

= V

– 0.2V ● 450 2000 nA

CM

S

–

+ 1V ● 25 400 nA

S

+

= V

– 0.2V ● 25 700 nA

CM

S

–

+ 1V ● 25 300 nA

S

+

= V

– 0.2V ● 25 300 nA

CM

S

= –2V to 2V, RL = 100Ω ● 2 5 V/mV

O

–

to 3.5V ● 82 105 dB

S

–

to 3.5V ● 76 105 dB

S

+

= 2.5V to 10V, V

S

+

= 2.5V to 10V, V

S

= 5mA ● 105 250 mV

SINK

= 20mA ● 250 575 mV

SINK

= 5mA ● 150 310 mV

SOURCE

= 20mA ● 600 975 mV

SOURCE

–

= 0V ● 74 91 dB

S

–

= 0V ● 68 93 dB

S

–

S

+

V

S

GBW Gain Bandwidth Product Frequency = 2MHz ● 70 MHz

SR Slew Rate AV = – 1, RL = 1k, VO = ± 4V, ● 20 V/µs

Measured at V

= ±2V

O

V

The ● denotes the specifications which apply over the temperature range of –40°C < TA < 85°C. VS = ±5V, VCM = 0V, V

= 0V, unless

OUT

otherwise noted. (Note 5)

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

V

∆V

OS

Input Offset Voltage VCM = V

Input Offset Shift VCM = V

OS

Input Offset Voltage Match VCM = V

(Channel-to-Channel) (Note 9) V

V V V

V

–

S

–

= V

(MS8) ● 350 1200 µV

CM

S

–

= V

(DD) ● 350 1500 µV

CM

S

+

= V

CM

S

–

+

to V

– 1.5V ● 50 750 µV

S

–

S

–

= V

(MS8) ● 380 1900 µV

CM

S

–

= V

(DD) ● 410 2100 µV

CM

S

● 350 1000 µV

● 0.75 5 mV

● 280 1700 µV

18012fa

7

LT1801/LT1802

ELECTRICAL CHARACTERISTICS

of – 40°C < T

< 85°C. VS = ± 5V, VCM = 0V, V

A

= 0V, unless otherwise noted. (Note 5)

OUT

The ● denotes the specifications which apply over the temperature range

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VOS TC Input Offset Voltage Drift (Note 8) ● 1.5 5 µV/°C

I

B

Input Bias Current VCM = V

V

Input Bias Current Match VCM = V

(Channel-to-Channel) (Note 9) V

I

OS

Input Offset Current VCM = V

V

A

VOL

Large-Signal Voltage Gain VO = –4V to 4V, RL = 1k ● 12.5 55 V/mV

V

CMRR Common Mode Rejection Ratio VCM = V

CMRR Match (Channel-to-Channel) (Note 9) VCM = V

Input Common Mode Range ● V

PSRR Power Supply Rejection Ratio V

PSRR Match (Channel-to-Channel) (Note 9) V

V

OL

Output Voltage Swing Low (Note 7) No Load ● 20 100 mV

I I

V

OH

Output Voltage Swing High (Note 7) No Load ● 30 110 mV

I I

I

SC

I

S

Short-Circuit Current ● 12.5 30 mA

Supply Current per Amplifier ● 2.6 4.5 mA

–

+ 1V ● 50 400 nA

S

+

= V

– 0.2V ● 450 2250 nA

CM

S

–

+ 1V ● 25 450 nA

S

+

= V

– 0.2V ● 25 700 nA

CM

S

–

+ 1V ● 25 350 nA

S

+

= V

– 0.2V ● 25 350 nA

CM

S

= –1V to 1V, RL = 100Ω ● 2 5 V/mV

O

–

to 3.5V ● 81 104 dB

S

–

to 3.5V ● 75 104 dB

S

+

= 2.5V to 10V, V

S

+

= 2.5V to 10V, V

S

= 5mA ● 110 275 mV

SINK

= 10mA ● 180 400 mV

SINK

= 5mA ● 150 350 mV

SOURCE

= 10mA ● 300 700 mV

SOURCE

–

= 0V ● 73 90 dB

S

–

= 0V ● 67 90 dB

S

–

S

+

V

S

GBW Gain Bandwidth Product Frequency = 2MHz ● 65 MHz

SR Slew Rate AV = – 1, RL = 1k, VO = ± 4V, ● 15 V/µs

Measured at V

Note 1: Absolute Maximum Ratings are those values beyond which the life of the device may be impaired.

Note 2: The inputs are protected by back-to-back diodes. If the differential input voltage exceeds 1.4V, the input current should be limited to less than 10mA.

Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted indefinitely.

Note 4: The LT1801C/LT1801I and LT1802C/LT1802I are guaranteed functional over the temperature range of – 40°C to 85°C.

Note 5: The LT1801C/LT1802C are guaranteed to meet specified performance from 0°C to 70°C. The LT1801C/LT1802C are designed, characterized and expected to meet specified performance from –40°C to 85°C but are not tested or QA sampled at these temperatures.

= ±2V

O

Note 6: Minimum supply voltage is guaranteed by power supply rejection ratio test.

Note 7: Output voltage swings are measured between the output and power supply rails.

Note 8: This parameter is not 100% tested. Note 9: Matching parameters are the difference between amplifiers A

and D and between B and C on the LT1802; between the two amplifiers on the LT1801.

Note 10: Thermal resistance (θ

) varies with the amount of PC board

JA

metal connected to the package. The specified values are for short traces connected to the leads. If desired, the thermal resistance can be substantially reduced by connecting Pin 4 of the SO-8 and MS8, Pin 11 of the SO-14 or the underside metal of the DD package to a larger metal area

–

trace).

(V

S

The LT1801I/LT1802I are guaranteed to meet specified performance from –40°C to 85°C.

V

8

18012fa

UW

TEMPERATURE (°C)

–60

–0.1

INPUT BIAS (µA)

0

0.2

0.3

0.4

40 60 80

0.8

18012 G06

0.1

–40 –20 0 20

0.5

0.6

0.7 NPN ACTIVE

V

S

= 5V, 0V

V

CM

= 5V

PNP ACTIVE V

S

= 5V, 0V

V

CM

= 1V

TYPICAL PERFOR A CE CHARACTERISTICS

LT1801/LT1802

VOS Distribution, VCM = 0V (PNP Stage)

35

VS = 5V, 0V

= 0V

V

CM

30

25

20

15

10

PERCENT OF UNITS (%)

5

0

–150 –50 250

–250

INPUT OFFSET VOLTAGE (µV)

50 150

Offset Voltage vs Input Common Mode Voltage

500

TA = –55°C

TA = 25°C

TA = 125°C

1

INPUT COMMON MODE VOLTAGE (V)

3

2

–100

–200

OFFSET VOLTAGE (µV)

–300

–400

–500

400

300

200

100

0

18012 G01

VS = 5V, 0V TYPICAL PART

4

18012 G04

VOS Distribution, VCM = 5V (NPN Stage)

45

VS = 5V, 0V

= 5V

V

40

CM

35

30

25

20

15

PERCENT OF UNITS (%)

10

5

0

–1200 –400 2000

–2000

INPUT OFFSET VOLTAGE (µV)

400 1200

18012 G02

Input Bias Current vs Common Mode Voltage

1.0 VS = 5V, 0V

= 25°C

0.8

0.6

0.4

0.2

–0.2

–0.4

INPUT BIAS CURRENT (µA)

–0.6

–0.8

5

–1.0

T

A

= 125°C

T

A

= –55°C

T

A

0

–1

INPUT COMMON MODE VOLTAGE (V)

1

23

4

5

18012 G05

6

Supply Current vs Supply Voltage

4

PER AMPLIFIER

3

2

SUPPLY CURRENT (mA)

1

0

3579102468 11

10

TOTAL SUPPLY VOLTAGE (V)

TA = 125°C

TA = 25°C

TA = –55°C

Input Bias Current vs Temperature

12

18012 G03

Output Saturation Voltage vs Load Current (Output Low)

10

VS = 5V, 0V

1

0.1

TA = 125°C

0.01 TA = –55°C

OUTPUT SATURATION VOLTAGE (V)

0.001

0.01 0.1

TA = 25°C

LOAD CURRENT (mA)

1 10 100

18012 G07

Output Saturation Voltage vs Load Current (Output High)

10

VS = 5V, 0V

1

0.1 TA = 125°C

0.01 TA = –55°C

OUTPUT SATURATION VOLTAGE (V)

0.001

0.01 0.1

TA = 25°C

1 10 100

LOAD CURRENT (mA)

18012 G08

18012fa

9

LT1801/LT1802

OUTPUT VOLTAGE (V)

0

–2000

CHANGE IN OFFSET VOLTAGE (µV)

–1200

–400

400

0.5

1

1.5 2

18012 G11

2.5

1200

2000

–1600

–800

0

800

1600

3

VS = 3V, 0V R

L

TO GND

RL = 1k

RL = 100Ω

FREQUENCY (kHz)

20

NOISE VOLTAGE (nV/√Hz)

40

60

10

30

50

0.01 1 10 100

18012 G16

0

0.1

VS = 5V, 0V

NPN ACTIVE V

CM

= 4.25V

PNP ACTIVE

V

CM

= 2.5V

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Output Short-Circuit Current

Minimum Supply Voltage

0.6

0.4

0.2

0

–0.2

–0.4

CHANGE IN OFFSET VOLTAGE (mV)

–0.6

1.5 2.5

0

TA = –55°C

TA = 25°C

TA = 125°C

2

TOTAL SUPPLY VOLTAGE (V)

3.5 5.5

3

4.5

5

4

18012 G09

vs Power Supply Voltage

70 60 50 40 30 20 10

0

–10 –20 –30 –40 –50

OUTPUT SHORT-CIRCUIT CURRENT (mA)

–60 –70

1.5

TA = 25°C

TA = 125°C

TA = –55°C SINKING

TA = 125°C

TA = 25°C

2.5

2

POWER SUPPLY VOLTAGE (±V)

3.5 5

3

SOURCINGTA = –55°C

4

Open-Loop Gain

4.5

18012 G10

Open-Loop Gain

2000

1600

1200

800

400

0

–400

–800

–1200

CHANGE IN OFFSET VOLTAGE (µV)

–1600

–2000

10

0

10.5

21.5

OUTPUT VOLTAGE (V)

120

110

100

90

80

70

OFFSET VOLTAGE (µV)

60

50

40

VS = 5V, 0V

TO GND

R

L

RL = 1k

RL = 100Ω

3 3.5 4.5

4

2.5

5

18012 G12

Warm-Up Drift vs Time

VS = ±5V

VS = ±2.5V

VS = ±1.5V

20 40 80

0

TIME AFTER POWER-UP (SECONDS)

60

Open-Loop Gain Offset Voltage vs Output Current

2000

1600

1200

800

400

–400

–800

–1200

CHANGE IN OFFSET VOLTAGE (µV)

–1600

–2000

VS = ±5V

TO GND

R

L

0

–3–4

–5

–1–2

OUTPUT VOLTAGE (V)

RL = 1k

RL = 100Ω

12 4

0

3

5

18012 G13

2.0 VS = ±5V

1.5

1.0

0.5

0

–0.5

TA = 25°C

–1.0

CHANGE IN OFFSET VOLTAGE (mV)

–1.5

–2.0

–45

–60

TA = –55°C

TA = 125°C

–15

0

–30

OUTPUT CURRENT (mA)

Input Noise Voltage vs Frequency

TYPICAL PART

100 120 140

18012 G15

15

30

45

18012 G14

18012fa

60

UW

FREQUENCY (MHz)

0.01

10

OPEN-LOOP GAIN (dB)

PHASE (DEG)

20

30

40

50

0.1 1 10 100 300

18012 G22

0–40

–10

–20

–30

60

70

–20

0

20

40

60

–60

–80

–100

80

100

VS = ±2.5V V

S

= ±5V

PHASE

GAIN

TYPICAL PERFOR A CE CHARACTERISTICS

Input Current Noise vs Frequency

3.0

2.5

2.0

= 4.25V

CM

PNP ACTIVE

= 2.5V

V

CM

0.1 FREQUENCY (kHz)

1.5

1.0

NOISE CURRENT (pA/√Hz)

NPN ACTIVE

0.5

V

0

0.01 1 10 100

VS = 5V, 0V

Gain Bandwidth and Phase Margin vs Temperature

100

90

80

70

60

50

GAIN BANDWIDTH (MHz)

–35 5

–55

GBW PRODUCT

PHASE MARGIN

V

PHASE MARGIN

V

–15

TEMPERATURE (°C)

GBW PRODUCT

V

S

= ±5V

V

S

= ±2.5V

S

= ±5V

S

45 125

65

25

= ±2.5V

85

18012 G17

105

18012 G20

PHASE MARGIN (DEG)

60

50

40

30

20

10

0.1Hz to 10Hz Input Voltage Noise

2000

VS = 5V, 0V

1000

0

–1000

INPUT NOISE VOLTAGE (nV)

–2000

0

246 107135 9

TIME (SECONDS)

Slew Rate vs Temperature

35

AV = –1

= RG = 1k

R

SLEW RATE (V/µs)

30

25

20

15

10

–55

F

= 1k

R

L

–35 5

–15

VS = ±2.5V

= ±5V

V

S

45 125

25

TEMPERATURE (°C)

8

85

65

18012 G18

105

18012 G21

LT1801/LT1802

Gain Bandwidth and Phase Margin vs Supply Voltage

100

90

GAIN BANDWIDTH

80

70

60 60

GAIN BANDWIDTH (MHz)

0

PRODUCT

PHASE MARGIN

246 107135 9

TOTAL SUPPLY VOLTAGE (V)

Gain and Phase vs Frequency

TA = 25°C

8

18012 G19

PHASE MARGIN (DEG)

50

40

30

20

Gain vs Frequency (AV = 1)

12

RL = 1k

= 10pF

C

L

9

= 1

A

V

6

3

0

GAIN (dB)

–3

–6

–9

–12

0.1 10 100 300

1

FREQUENCY (MHz)

VS = ±2.5V

VS = ±5V

18012 G23

Gain vs Frequency (AV = 2)

18

RL = 1k

= 10pF

C

L

15

= 2

A

V

12

9

6

GAIN (dB)

3

0

–3

–6

0.1 10 100 300

VS = ±5V

1

FREQUENCY (MHz)

VS = ±2.5V

18012 G24

18012fa

11

LT1801/LT1802

UW

TYPICAL PERFOR A CE CHARACTERISTICS

Output Impedance vs Frequency

600

VS = ±2.5V

100

AV = 10

AV = 1

AV = 2

1 10 100 500

FREQUENCY (MHz)

0.1

OUTPUT IMPEDANCE (Ω)

0.01

0.001

10

1

0.1

Series Output Resistor vs Capacitive Load

60

VS = 5V, 0V

55

= 1

A

V

50

45

40

35

30

25

OVERSHOOT (%)

20

15

10

ROS = RL = 50Ω

5

0

10

ROS = 20Ω

100 1000 10000

CAPACITIVE LOAD (pF)

ROS = 10Ω

18012 G25

18012 G28

Common Mode Rejection Ratio vs Frequency

120

VS = 5V, 0V

100

80

60

40

20

COMMON MODE REJECTION RATIO (dB)

0

0.01 1 10 100

0.1 FREQUENCY (MHz)

Series Output Resistor vs Capacitive Load

60

VS = 5V, 0V

55

= 2

A

V

50

45

40

35

30

25

OVERSHOOT (%)

20

15

10

5

ROS = RL = 50Ω

0

10

100 1000 10000

CAPACITIVE LOAD (pF)

ROS = 10Ω

ROS = 20Ω

18012 G26

18012 G29

Power Supply Rejection Ratio vs Frequency

90

80

70

NEGATIVE

60

SUPPLY

50

40

30

20

10

0

POWER SUPPLY REJECTION RATIO (dB)

–10

0.001

0.01 0.1 1 10 100 FREQUENCY (MHz)

POSITIVE SUPPLY

Distortion vs Frequency

–40

VS = 5V, 0V

= 1

A

V

–50

–60

–70

–80

DISTORTION (dBc)

–90

–100

–110

0.01

V

OUT

= 2V

P-P

RL = 150Ω, 2ND

RL = 1k, 3RD

0.1 1 10 FREQUENCY (MHz)

RL = 150Ω, 3RD

VS = 5V, 0V

= 25°C

T

A

18012 G27

RL = 1k, 2ND

18012 G30

12

Distortion vs Frequency

–40

VS = 5V, 0V

= 2

A

V

–50

–60

–70

–80

DISTORTION (dBc)

–90

–100

–110

V

0.01

= 2V

OUT

P-P

RL = 150Ω, 2ND

RL = 1k, 3RD

0.1 1 10

FREQUENCY (MHz)

RL = 1k, 2ND

RL = 150Ω, 3RD

18012 G31

Maximum Undistorted Output Signal vs Frequency

4.6

4.5

)

P-P

4.4

4.3

4.2

4.1

OUTPUT VOLTAGE SWING (V

4.0 VS = 5V, 0V

= 1k

R

L

3.9

1k 100k 1M 10M

10k

FREQUENCY (Hz)

AV = 2

AV = –1

18012 G32

18012fa

UW

TYPICAL PERFOR A CE CHARACTERISTICS

LT1801/LT1802

5V Large-Signal Response

1V/DIV

0V

= 5V, 0V 100ns/DIV 18012 G33

V

S

AV = 1

= 1k

R

L

± 5V Large-Signal Response

2V/DIV

0V

50mV/DIV

0V

50mV/DIV

0V

5V Small-Signal Response

= 5V, 0V 50ns/DIV 18012 G34

V

S

AV = 1

= 1k

R

L

±5V Small-Signal Response

= ±5V 200ns/DIV 18012 G35

V

S

AV = 1

= 1k

R

L

V

IN

1V/DIV

0V

V

OUT

2V/DIV

= ±5V 50ns/DIV 18012 G36

V

S

AV = 1

= 1k

R

L

Output Overdriven Recovery

VS = 5V, 0V 100ns/DIV 18012 G37 AV = 2 R

= 1k

L

18012fa

13

LT1801/LT1802

WUUU

APPLICATIO S I FOR ATIO

Circuit Description

The LT1801/LT1802 have an input and output signal range that covers from the negative power supply to the positive power supply. Figure 1 depicts a simplified schematic of the amplifier. The input stage is comprised of two differential amplifiers, a PNP stage Q1/Q2 and an NPN stage Q3/ Q4 that are active over the different ranges of common mode input voltage. The PNP differential pair is active between the negative supply to approximately 1.2V below the positive supply. As the input voltage moves closer toward the positive supply, the transistor Q5 will steer the tail current I1 to the current mirror Q6/Q7, activating the NPN differential pair and the PNP pair becomes inactive for the rest of the input common mode range up to the positive supply. Also at the input stage, devices Q17 to Q19 act to cancel the bias current of the PNP input pair. When Q1-Q2 are active, the current in Q16 is controlled to be the same as the current in Q1-Q2, thus the base current of Q16 is nominally equal to the base current of the input devices. The base current of Q16 is then mirrored by devices Q17-Q19 to cancel the base current of the input devices Q1-Q2.

A pair of complementary common emitter stages Q14/ Q15 that enable the output to swing from rail to rail constructs the output stage. The capacitors C2 and C3 form the local feedback loops that lower the output impedance at high frequency. These devices are fabricated on Linear Technology’s proprietary high speed complementary bipolar process.

Power Dissipation

The LT1801 amplifier is offered in a small package, SO-8, which has a thermal resistance of 190°C/W, θJA. So there is a need to ensure that the die’s junction temperature should not exceed 150°C. Junction temperature TJ is calculated from the ambient temperature TA, power dissipation PD and thermal resistance θJA:

TJ = TA + (PD • θJA)

The power dissipation in the IC is the function of the supply voltage, output voltage and the load resistance. For a given supply voltage, the worst-case power dissipation P

DMAX

occurs at the maximum supply current and the output

+

V

R3 R4 R5

–

+

V

+

I

2

+IN

–IN

Q16

Q18Q17

–

V

ESDD2ESDD1

D6D7D8

D5

ESDD3ESDD4

–

V+V

Q19

D1

D2

Q4

Q7

Q5 V

Q3

+

I

1

BIAS

Q2

Q1

D3

D4

Q6

Q10

Q11

Q12

Q13 Q15

C2

+

I

3

C

–

V

BUFFER

AND

OUTPUT BIAS

Q9

Q8

C1

R2R1

OUT

Q14

18012 F01

Figure 1. LT1801/LT1802 Simplified Schematic Diagram

14

18012fa

WUUU

APPLICATIO S I FOR ATIO

LT1801/LT1802

voltage is at half of either supply voltage (or the maximum swing is less than 1/2 supply voltage). P

= (VS • I

P

DMAX

Example: An LT1801 in an SO-8 package operating on ±5V supplies and driving a 50Ω load, the worst-case power dissipation is given by:

P

If both amplifiers are loaded simultaneously, then the total power dissipation is 0.34W.

The maximum ambient temperature that the part is allowed to operate is:

TA = TJ – (P

= 150°C – (0.34W • 190°C/W) = 85°C

Input Offset Voltage

The offset voltage will change depending upon which input stage is active. The PNP input stage is active from the negative supply rail to 1.2V from the positive supply rail, then the NPN input stage is activated for the remaining input range up to the positive supply rail during which the PNP stage remains inactive. The offset voltage is typically less than 75µV in the range that the PNP input stage is active.

Input Bias Current

The LT1801/LT1802 employ a patent-pending technique to trim the input bias current to less than 250nA for the input common mode voltage of 0.2V above negative supply rail to 1.2V of the positive rail. The low input offset voltage and low input bias current of the LT1801/LT1802 provide precision performance especially for high source impedance applications.

= (10 • 4.5mA) + (2.5)2/50 = 0.045 + 0.125

DMAX

= 0.17W

DMAX

) + (VS/2)2/R

SMAX

• 190°C/W)

L

is given by:

DMAX

Output

The LT1801/LT1802 can deliver a large output current, so the short-circuit current limit is set around 50mA to prevent damage to the device. Attention must be paid to keep the junction temperature of the IC below the absolute maximum rating of 150°C (refer to the Power Dissipation section) when the output is continuously short circuited. The output of the amplifier has reverse-biased diodes connected to each supply. If the output is forced beyond either supply, unlimited current will flow through these diodes. If the current is transient and limited to several hundred mA and the total supply voltage is less than

12.6V, the absolute maximum rating, no damage will occur to the device.

Overdrive Protection

When the input voltage exceeds the power supplies, two pairs of crossing diodes D1 to D4 will prevent the output from reversing polarity. If the input voltage exceeds either power supply by 700mV, diode D1/D2 or D3/D4 will turn on to keep the output at the proper polarity. For the phase reversal protection to perform properly, the input current must be limited to less than 10mA. If the amplifier is severely overdriven, an external resistor should be used to limit the overdrive current.

The LT1801/LT1802’s input stages are also protected against a large differential input voltage of 1.4V or higher by a pair of back-back diodes D5/D8 to prevent the emitterbase breakdown of the input transistors. The current in these diodes should be limited to less than 10mA when they are active. The worst-case differential input voltage usually occurs when the input is driven while the output is shorted to ground in a unity gain configuration. In addition, the amplifier is protected against ESD strikes up to 3kV on all pins by a pair of protection diodes on each pin that are connected to the power supplies as shown in Figure 1.

18012fa

15

LT1801/LT1802

WUUU

APPLICATIO S I FOR ATIO

Capacitive Load

The LT1801/LT1802 are optimized for high bandwidth, low power and precision applications. They can drive a capacitive load of about 75pF in a unity-gain configuration, and more for higher gain. When driving a larger capacitive load, a resistor of 10Ω to 50Ω should be connected between the output and the capacitive load to avoid ringing or oscillation. The feedback should still be taken from the output so that the resistor will isolate the capacitive load to ensure stability. Graphs on capacitive loads indicate the transient response of the amplifier when driving capacitive load with a specified series resistor.

U

TYPICAL APPLICATIO S

Single 3V Supply, 1MHz, 4th Order Butterworth Filter

The circuit shown on the first page of this data sheet makes use of the low voltage operation and the wide bandwidth of the LT1801 to create a DC accurate 1MHz 4th order lowpass filter powered from a 3V supply. The amplifiers are configured in the inverting mode for the lowest distortion and the output can swing rail-to-rail for maximum dynamic range. Also on the first page of this data sheet, the graph displays the frequency response of the filter. Stopband attenuation is greater than 100dB at 50MHz. With a 2.25V monic distortion products of less than –85dBc. Worst case output offset voltage is less than 6mV.

, 250kHz input signal, the filter has har-

P-P

Feedback Components

When feedback resistors are used to set up gain, care must be taken to ensure that the pole formed by the feedback resistors and the total capacitance at the inverting input does not degrade stability. For instance, the LT1801/ LT1802 in a noninverting gain of 2, setup with two 5k resistors and a capacitance of 5pF (part plus PC board) will probably oscillate. The pole is formed at 12.7MHz that will reduce phase margin by 57 degrees when the crossover frequency of the amplifier is around 20MHz. A capacitor of 5pF or higher connected across the feedback resistor will eliminate any ringing or oscillation.

Fast 1A Current Sense Amplifier

A simple, fast current sense amplifier in Figure 2 is suitable for quickly responding to out-of-range currents. The circuit amplifies the voltage across the 0.1Ω sense resistor by a gain of 20, resulting in a conversion gain of 2V/A. The – 3dB bandwidth of the circuit is 4MHz, and the uncertainty due to VOS and IB is less than 4mA. The minimum output voltage is 60mV, corresponding to 30mA. The large-signal response of the circuit is shown in Figure 3.

16

I

L

0A TO 1A

52.3

Ω

0.1

Ω

52.3

Ω

V

= 2 • I

OUT

= 4MHz

L

f

–3dB

UNCERTAINTY DUE TO V

Figure 2. Fast 1A Current Sense

3V

+

1/2 LT1801

–

OS, IB

18012 F02

< 4mA

V

OUT

0V TO 2V

1k

500mV/DIV

0V

= 3V 50ns/DIV 18012 F03

V

S

Figure 3. Current Sense Amplifier Large-Signal Response

18012fa

U

TYPICAL APPLICATIO S

LT1801/LT1802

Single Supply 1A Laser Driver Amplifier

Figure 4 shows the LT1801 used in a 1A laser driver application. One of the reasons the LT1801 is well suited to this control task is that its 2.3V operation ensures that it will be awaked during power-up and operated before the circuit can otherwise cause significant current to flow in the 2.1V threshold laser diode. Driving the noninverting input of the LT1801 to a voltage VIN will control the turning on of the high current NPN transistor, FMMT619 and the laser diode. A current equal to VIN/R1 flows through the laser diode. The LT1801 low offset voltage and low input

DO NOT FLOAT

V

IN

+

1/2 LT1801

–

bias current allows it to control the current that flows through the laser diode precisely. The overall circuit is a 1A per volt V-to-I converter. Frequency compensation components R2 and C1 are selected for fast but zero-overshoot time domain response to avoid overcurrent conditions in the laser. The time domain response of this circuit, measured at R1 and given a 500mV 230ns input pulse, is shown in Figure 5. While the circuit is capable of 1A operation, the laser diode and the transistor are thermally limited due to power dissipation, so they must be operated at low duty cycles.

5V

R3

Q1

Ω

10

C1 39pF

330

ZETEX FMMT619

IR LASER INFINEON

R1

Ω

1

18012 F04

SFH495

R2

Ω

Figure 4. Single Supply 1A Laser Driver Amplifier

100mA/DIV

50ns/DIV 18012 F05

Figure 5. 500mA Pulse Response

18012fa

17

LT1801/LT1802

PACKAGE DESCRIPTIO

U

DD Package

8-Lead Plastic DFN (3mm × 3mm)

(Reference LTC DWG # 05-08-1698)

0.675 ±0.05

R = 0.115

TYP

0.38 ± 0.10

85

3.5 ±0.05

1.65 ±0.05 (2 SIDES)2.15 ±0.05

PACKAGE OUTLINE

0.28 ± 0.05

RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS

2.38 ±0.05 (2 SIDES)

5.23

(.206)

MIN

0.50 BSC

3.00 ±0.10

PIN 1

TOP MARK

0.200 REF

NOTE:

1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)

2. ALL DIMENSIONS ARE IN MILLIMETERS

3. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE

4. EXPOSED PAD SHALL BE SOLDER PLATED

(4 SIDES)

0.75 ±0.05

MS8 Package

8-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1660)

0.889

± 0.127

(.035 ± .005)

3.2 – 3.45

(.126 – .136)

0.00 – 0.05

1.65 ± 0.10 (2 SIDES)

0.28 ± 0.05

BOTTOM VIEW—EXPOSED PAD

2.38 ±0.10 (2 SIDES)

14

0.50 BSC

(DD8) DFN 0203

18

3.00 ± 0.102

PLANE

(.118 ± .004)

(NOTE 3)

4.90

± 0.15

(1.93 ± .006)

0.22 – 0.38

(.009 – .015)

TYP

1.10

(.043)

MAX

8

12

0.65

(.0256)

BSC

7

DETAIL “A”

0.65

(.0256)

BSC

° – 6° TYP

0

0.53 ± 0.015

(.021 ± .006)

SEATING

0.42 ± 0.04

(.0165 ± .0015)

TYP

RECOMMENDED SOLDER PAD LAYOUT

0.254 (.010)

GAUGE PLANE

0.18

(.077)

NOTE:

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE

5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX

0.52

(.206)

6

5

REF

3.00 ± 0.102 (.118 ± .004)

NOTE 4

4

3

0.86

(.034)

REF

0.13 ± 0.076

(.005 ± .003)

MSOP (MS8) 0802

18012fa

PACKAGE DESCRIPTIO

.050 BSC

N

.245 MIN

1 2 3 N/2

.030 ±.005

TYP

RECOMMENDED SOLDER PAD LAYOUT

U

S8 Package

8-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

.189 – .197

.045 ±.005

.160

±.005

.228 – .244

(5.791 – 6.197)

(4.801 – 5.004)

8

N

1

NOTE 3

7

2

6

3

5

N/2

4

LT1801/LT1802

.150 – .157

(3.810 – 3.988)

NOTE 3

.030 ±.005

TYP

.010 – .020

(0.254 – 0.508)

.008 – .010

(0.203 – 0.254)

NOTE:

1. DIMENSIONS IN

2. DRAWING NOT TO SCALE

3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

.050 BSC

N

.245 MIN

1 2 3 N/2

RECOMMENDED SOLDER PAD LAYOUT

×

°

45

0°– 8° TYP

.016 – .050

(0.406 – 1.270)

INCHES

(MILLIMETERS)

.053 – .069

(1.346 – 1.752)

.014 – .019

(0.355 – 0.483)

TYP

S Package

14-Lead Plastic Small Outline (Narrow .150 Inch)

(Reference LTC DWG # 05-08-1610)

2

.337 – .344

(8.560 – 8.738)

NOTE 3

12

11

3

4

10

5

.045 ±.005

.160 ±.005

.228 – .244

(5.791 – 6.197)

13

14

N

1

.004 – .010

(0.101 – 0.254)

.050

(1.270)

BSC

9

N/2

6

SO8 0502

8

7

.150 – .157

(3.810 – 3.988)

NOTE 3

.010 – .020

(0.254 – 0.508)

.008 – .010

(0.203 – 0.254)

NOTE:

1. DIMENSIONS IN

2. DRAWING NOT TO SCALE

3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)

× 45°

(1.346 – 1.752)

0° – 8° TYP

.016 – .050

(0.406 – 1.270)

INCHES

(MILLIMETERS)

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 representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.

.053 – .069

.014 – .019

(0.355 – 0.483)

TYP

.050

(1.270)

BSC

.004 – .010

(0.101 – 0.254)

S14 0502

18012fa

19

LT1801/LT1802

TYPICAL APPLICATIO

U

Low Power High Voltage Amplifier

Certain materials used in optical applications have characteristics that change due to the presence and strength of a DC electric field. The voltage applied across these materials should be precisely controlled to maintain desired properties, sometimes as high as 100’s of volts. The materials are not conductive and represent a capacitive load.

The circuit of Figure 6 shows the LT1801 used in an amplifier capable of a 250V output swing and providing

130V

5V

0.1µF

R2 2k

V

IN

R1

2k

C2

8pF

150V

+

1/2 LT1801

–

R3 200k

5V

39pF

C1

Q1

Q3

Figure 6. Low Power, High Voltage Amplifier

10k

Q5

R4

2k

R5

2k

Q7

4.99k 1k

Q2

5V

R6 2k

R7 2k

Q4

4.99k

–130V

Q6

V

OUT

MATERIAL UNDER ELECTRIC FIELD 100pF

AV = V

±130V SUPPLY I

Q8

OUTPUT SWING = ±128.8V OUTPUT OFFSET

1k

OUTPUT SHORT-CIRCUIT CURRENT ≅ 3mA 10% TO 90% RISE TIME ≅ 8µs, 200V OUTPUT STEP SMALL-SIGNAL BANDWIDTH ≅ 150kHz Q1, Q2, Q7, Q8: ON SEMI MPSA42 Q3, Q4, Q5, Q6: ON SEMI MPSA92

18012 F06

OUT/VIN

= –100

Q

≅ 20mV

= 130µA

precise DC output voltage. When no signal is present, the op amp output sits at about mid-supply. Transistors Q1 and Q3 create bias voltages for Q2 and Q4, which are forced into a low quiescent current by degeneration resistors R4 and R5. When a transient signal arrives at VIN, the op amp output moves and causes the current in Q2 or Q4 to change depending on the signal polarity. The current, limited by the clipping of the LT1801 output and the 3kΩ of total emitter degeneration, is mirrored to the output devices to drive the capacitive load. The LT1801 output then returns to near mid-supply, providing the precise DC output voltage to the load. The attention to limit the current of the output devices minimizes power dissipation thus allowing for dense layout, and inherits better reliability. Figure 7 shows the time domain response of the amplifier providing a 200V output swing into a 100pF load.

V

IN

2V/DIV

V

OUT

50V/DIV

10µs/DIV 18012 F07

Figure 7. Large-Signal Time Domain Response of the Amplifier

RELATED PARTS

PART NUMBER DESCRIPTION COMMENTS

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Max Supply Current 4.4mA per Amplifier LT1800 80MHz, 25V/µs Low Power Rail-to-Rail Input/Output Precision Op Amp Single Version of LT1801/LT1802 LT1806/LT1807 Single/Dual 325MHz, 140V/µs Rail-to-Rail Input and Output Op Amps High DC Accuracy, 550µV V

Low Distortion –80dB at 5MHz, Power-Down (LT1806) LT1809/LT1810 Single/Dual 180MHz Rail-to-Rail Input/Output Op Amps 350V/µs Slew Rate, Low Distortion –90dBc at 5MHz,

Power-Down (LT1809) C-Load is a trademark of Linear Technology Corporation.

LT/TP 0303 1K REV A • PRINTED IN USA

20

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ● FAX: (408) 434-0507

●

www.linear.com

, 4µV/°C Max Drift

OS(MAX)

, 70mA Output Current,

OS(MAX)

, Low Noise 3.5nV/√Hz,

OS(MAX)

18012fa

LINEAR TECHNOLOGY LT1801, LT1802 Technical data

Specifications and Main Features

Frequently Asked Questions

User Manual