Burr Brown OPA643N-250, OPA643NB-3K, OPA643U, OPA643UB, OPA643NB-250 Datasheet

®

OPA643

1

Wideband Low Distortion, High Gain

OPERATIONAL AMPLIFIER

®

OPA643

APPLICATIONS

● BASE STATION ADC PREAMP

● ADC/DAC BUFFER AMPLIFIER

● LOW DISTORTION IF AMPLIFIER

● LOW NOISE, BROADBAND,

TRANSIMPEDANCE AMPLIFIER

● LOW NOISE PREAMPLIFIER

● VIDEO AMPLIFICATION

● TEST INSTRUMENTATION

OPA643

OPA658

OPA643

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: [phone] • Twx: 910-952-1111

Internet: http://www.burr-brown.com/ • FAXLine: [phone] (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: [phone] • Immediate Product Info: [phone]

FEATURES

● LOW DISTORTION: –90dBc at 5MHz

● LOW NOISE: 2.3nV/√Hz

● GAIN-BANDWIDTH PRODUCT: 800MHz

● AVAILABLE IN SOT23-5 PACKAGE

● STABLE IN GAINS

≥ 3

● HIGH SLEW RATE: 1000V/

µs

● HIGH OPEN-LOOP GAIN: 95dB

● HIGH OUTPUT CURRENT:

±60mA

DESCRIPTION

The OPA643 provides a level of speed and dynamic
range previously unattainable in a monolithic op amp.
Using a de-compensated voltage feedback architec­ture with two internal gain stages, the OPA643 achieves
exceptionally low harmonic distortion over a wide
frequency range. The "classic" differential input pro­vides all the familiar benefits of precision op amps,
such as bias current cancellation and very low invert­ing current noise compared with wideband current
feedback op amps. High slew rate and open-loop gain,
along with low input noise and high output current

drive make the OPA643 ideal for very high dynamic
range requirements.

The high gain bandwidth product for the gain ≥ 3
stable OPA643 makes it particularly suitable for
wideband transimpedance amplifiers and moderate gain
IF amplifier applications. External compensation
techniques may be used to apply the OPA643 at low
gains giving exceptionally low distortion and frequency
response flatness. Where unity gain stability with
comparable distortion performance is required, consider
the OPA642.

806Ω

50Ω

1Vp-p

10MHz

OPA643

47pF

REFT

+5V

REFB

ADS805

12-Bit

20MSPS

Measured

80dB SFDR

Analog

Input

56.9Ω

0.1µF

0.1µF

402Ω

5kΩ

High Dynamic Range 20MSPS Digitizer

5kΩ

0.1µF

2Vp-p

+5V

–5V

14pF

280Ω

0.1µFLow Gain

Compensation

50Ω

Source

2.7pF

©

1993 Burr-Brown Corporation PDS-1191D Printed in U.S.A. March, 1998

®

OPA643

2

SPECIFICATIONS

ELECTRICAL

At TA = +25°C, VS = ±5V, RL = 100Ω, RF = 402Ω, unless otherwise noted.

OPA643P, U, N OPA643PB, UB, NB
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
OFFSET VOLTAGE

Input Offset Voltage ±2.5 ±4 ±0.5 ±1.5 mV

Average Drift 53µV/°C

Power Supply Rejection (PSR) V

S

= ±4.5 to ±5.5V 65 90 70 ✻ dB

INPUT BIAS CURRENT

Input Bias Current V

CM

= 0V 19 30 ✻✻ µA

Over Specified Temperature 40 ✻ µA

Input Offset Current V

CM

= 0V 0.1 2.0 ✻✻ µA

Over Specified Temperature 3.0 ✻ µA

NOISE

Input Voltage Noise

Noise Density: f > 1MHz 2.3 ✻ nV/√Hz
Integrated Voltage Noise, BW = 100Hz to 100MHz 23 ✻ µVrms

Input Bias Current Noise

Current Noise Density, f > 1MHz 2.5 ✻ pA/√Hz

INPUT VOLTAGE RANGE

Common-Mode Input Range ±2.75 ±3.0 ✻✻ V

Over Specified Temperature ±2.5 ✻ V

Common-Mode Rejection (CMR) V

CM

= ±0.5V 65 85 80 92 dB

INPUT IMPEDANCE

Differential 7 || 2.5 ✻ kΩ || pF
Common-Mode 630 || 1.3 ✻ kΩ || pF

OPEN-LOOP GAIN

Open-Loop Voltage Gain (A

OL

)V

O

= ±2V, RL = 100Ω 82 95 87 ✻ dB

Over Specified Temperature V

O

= ±2V, RL = 100Ω 80 80 dB

FREQUENCY RESPONSE

Closed-Loop Bandwidth Gain = +5V/V 200 ✻ MHz

Gain = +10V/V 85 ✻ MHz

Gain = +20V/V 40 ✻ MHz
Gain Bandwidth Product (GBP) 800 ✻ MHz
Slew Rate

(1)

G = +5, 2V Step 1000 ✻ V/µs

At Minimum Specified Temperature G = +5, 2V Step 920 ✻ V/µs

Settling Time: 0.01% G = +5, 2V Step 21 ✻ ns

0.1% G = +5, 2V Step 16.5 ✻ ns
1% G = +5, 2V Step 7.5 ns

Spurious Free Dynamic Range (SFDR) G = +5, f = 5MHz 90 95 dBc

V

O

= 2Vp-p, RL = 500Ω

Differential Gain Error at 3.58MHz G = +5V/V, V

O

= 0V to 1.4V, RL = 150Ω 0.005 ✻ %

Differential Phase Error at 3.58MHz G = +5V/V, V

O

= 0V to 1.4V, RL = 150Ω 0.015 ✻ degrees

OUTPUT

Voltage Output No Load ±3.25 ✻ V

Over Specified Temperature ±3.0 ✻ V

Voltage Output, +25°CR

L

= 100Ω±2.75 ✻ V

Over Specified Temperature ±2.5 ✻ V

Current Output, +25°C ±40 ±60 ±50 ±65 mA

Over Specified Temperature ±35 ±40 mA

Closed-Loop Output Resistance 0.1MHz, G = +5V/V 0.055 ✻ Ω

POWER SUPPLY

Specified Operating Voltage ±5 ✻ V
Operating Voltage Range T

MIN

to T

MAX

±4.5 ±5.5 ✻✻V

Quiescent Current ±20 ±25 ±16 ✻✻ mA

Over Specified Temperature ±26 ✻ mA

TEMPERATURE RANGE

Specification: P, U, N Ambient –40 +85 ✻✻°C
Thermal Resistance

θ

JA

, Junction to Ambient
P, PB 8-Pin DIP 100 ✻ °C/W
U, UB 8-Pin SO-8 125 ✻ °C/W
N, NB 5-Pin SOT23-5 150 ✻ °C/W

✻ Specifications same as OPA643P, U, N.

NOTE: (1) Slew rate is rate of change from 10% to 90% of output voltage step.

®

OPA643

3

1

2

3

54+V

S

Inverting Input

Output

–V

S

Non-Inverting Input

1

2
3
4

8

7
6
5

+V

S2

(1)

+V

S1

Output
–V

S2

(1)

NC

Inverting Input

Non-Inverting Input

–V

S1

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

PIN CONFIGURATION

Top View DIP/SO-8

ABSOLUTE MAXIMUM RATINGS

Power Supply (±VS)..................................................................... ±6.0VDC

Internal Power Dissipation

(1)

.................................. See Thermal Analysis

Differential Input Voltage .................................................................. ±1.2V

Input Voltage Range ............................................................................ ±V

S

Storage Temperature Range: P, PB, U, UB, N, NB ..... –40°C to +125°C

Lead Temperature (soldering, 10s).............................................. +300°C

(soldering, SO-8 3s) ....................................... +260°C

Junction Temperature (T

J

) ............................................................ +175°C

NOTE: (1) Packages must be derated based on specified

θ

JA. Maximum T

J

must be observed.

NOTE: (1) Making use of all four power supply pins is highly recommended,
although not required. Using these four pins, instead of just pins 4 and 7, will
lower the power supply impedance improving distortion.

SOT23-5

PACKAGE
DRAWING TEMPERATURE PACKAGE ORDERING

PRODUCT PACKAGE NUMBER

(1)

RANGE MARKING

(2)

NUMBER

(3)

OPA643U SO-8 Surface Mount 182 –40°C to +85°C OPA643U OPA643U
OPA643UB SO-8 Surface Mount 182 –40°C to +85°C OPA643UB OPA643UB
OPA643N 5-pin SOT23-5 331 –40°C to +85°C A43 OPA643N-250

OPA643N-3k

OPA643NB 5-pin SOT23-5 331 –40°C to +85°C A43B OPA643NB-250

OPA643NB-3k
OPA643P 8-Pin Plastic DIP 006 –40°C to +85°C OPA643P OPA643P
OPA643PB 8-Pin Plastic DIP 006 –40°C to +85°C OPA643PB OPA643PB

NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) The “B” grade of the SO-8 and
DIP packages will be marked with a “B” by pin 8. The “B” grade of the SOT23-5 will be marked with a “B” near pins 3 and 4. (3) The SOT23-5 is only available on a 7"
tape and reel (e.g. ordering 250 pieces of “OPA643N-250” will get a single 250 piece tape and reel. Ordering 3000 pieces of “OPA643N-3k” will get a single 3000 piece
tape and reel). Please refer to Appendix B of Burr-Brown IC Data Book for detailed Tape and Reel Mechanical information.

PACKAGE/ORDERING INFORMATION

ELECTROSTATIC
DISCHARGE SENSITIVITY

Electrostatic discharge can cause damage ranging from per­formance degradation to complete device failure. Burr-Brown
Corporation recommends that all integrated circuits be handled
and stored using appropriate ESD protection methods.

ESD damage can range from subtle performance degradation
to complete device failure. Precision integrated circuits may
be more susceptible to damage because very small parametric
changes could cause the device not to meet published speci­fications.

®

OPA643

4

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = ±5V, RL = 100Ω, RF = 402Ω, unless otherwise noted

LARGE SIGNAL FREQUENCY RESPONSE

Frequency

0.5MHz 10MHz 100MHz 500MHz

20
17
14
11

8
5

2
–1
–4
–7

–10

Gain (3dB/div)

G = +5

VO = 1Vp-p

VO = 2Vp-p

VO = 4Vp-p

RS vs CAPACITIVE LOAD

Capacitive Load (pF)

101 100

60

50

40

30

20

10

0

R

S

(Ω)

LARGE SIGNAL PULSE RESPONSE

Time (5ns/div)

2.0

1.6

1.2

0.8

0.4
0

–0.4
–0.8
–1.2
–1.4
–2.0

Output Voltage (400mV/div)

SMALL SIGNAL FREQUENCY RESPONSE

Frequency

0.5MHz 10MHz 100MHz 500MHz

6
3

0
–3
–6
–9

–12
–15
–18
–21
–24

Normalized Gain (3dB/div)

VO = 0.1Vp-p

G = +5

G = +10

G = +20

G = +50

FREQUENCY RESPONSE vs CAPACITIVE LOAD

Frequency (20MHz/div)

100MHz0 200MHz

23
20
17
14
11

8
5

2
–1
–4
–7

Gain to Capacitive Load (3dB/div)

CL = 10pFG = +5

CL = 22pF

1kΩ

100Ω

402Ω

(1kΩ is optional)

R

S

C

L

V

IN

V

O

CL = 100pF

CL = 47pF

OPA643

SMALL SIGNAL PULSE RESPONSE

Time (5ns/div)

200
160
120

80
40

0
–40
–80

–120
–160
–200

Output Voltage (40mV/div)

®

OPA643

5

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, VS = ±5V, RL = 100Ω, RF = 402Ω, unless otherwise noted.

5MHz 2ND HARMONIC DISTORTION

Output Voltage Swing (Vp-p)

10.1 10

G = +5

–70

–75

–80

–85

–90

–95

–100

2nd Harmonic Distortion (dBc)

RL = 500Ω

RL = 100Ω

RL = 200Ω

5MHz 3RD HARMONIC DISTORTION

Output Voltage Swing (Vp-p)

10.1 10

3rd Harmonic Distortion (dBc)

G = +5

–70

–75

–80

–85

–90

–95

–100

RL = 200Ω

RL = 100Ω

RL = 500Ω

10MHz 2ND HARMONIC DISTORTION

Output Voltage Swing (Vp-p)

10.1 10

2nd Harmonic Distortion (dBc)

G = +5

–60

–65

–70

–75

–80

–85

–90

RL = 100Ω

RL = 500Ω

RL = 200Ω

10MHz 3RD HARMONIC DISTORTION

Output Voltage Swing (Vp-p)

10.1 10

G = +5

3rd Harmonic Distortion (dBc)

–60

–65

–70

–75

–80

–85

–90

RL = 500Ω

RL = 100Ω

RL = 200Ω

20MHz 2ND HARMONIC DISTORTION

Output Voltage Swing (Vp-p)

10.1 10

G = +5

2nd Harmonic Distortion (dBc)

–60

–65

–70

–75

–80

–85

–90

RL = 100Ω

RL = 200Ω

RL = 500Ω

20MHz 3RD HARMONIC DISTORTION

Output Voltage Swing (Vp-p)

10.1 10

G = +5

3rd Harmonic Distortion (dBc)

–60

–65

–70

–75

–80

–85

–90

RL = 200Ω

RL = 500Ω

RL = 100Ω

®

OPA643

6

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, VS = ±5V, RL = 100Ω, RF = 402Ω, unless otherwise noted.

3RD HARMONIC DISTORTION vs FREQUENCY

Frequency (MHz)

1100.1 20

G = 5

–40

–50

–60

–70

–80

–90

–100

3rd Harmonic Distortion (dBc)

VO = 2Vp-p

G = 10

G = 20

0

DC Offset (V)

Differential Gain Error (%)

1.40.7

0

0.7

1.4

DC Offset (V)

Differential Phase Error (°)

0.004

0.002

0.000
–0.002
–0.004
–0.006

0.015

0.010

0.005

0.000

2ND HARMONIC DISTORTION vs FREQUENCY

Frequency (MHz)

1100.1 20

G = 10

–40

–50

–60

–70

–80

–90

–100

2nd Harmonic Distortion (dBc)

VO = 2Vp-p

G = 20

G = 5

OPEN-LOOP GAIN AND PHASE

Frequency (Hz)

10

3

10410510610710810

9

10

2

100

90
80
70
60
50
40
30
20
10

0

Open-Loop Gain (dB)

0
–30
–60
–90
–120
–150
–180
–210
–240
–270
–300

Open-Loop Phase (30°/div)

TWO-TONE, THIRD ORDER

INTERMODULATION INTERCEPT

Frequency (MHz)

50 101520253035404550

55

50

45

40

35

30

25

Intercept (dBm)

100Ω

402Ω

OPA643

50Ω

50Ω

50Ω

P

i

P

O

INPUT VOLTAGE AND CURRENT NOISE DENSITY

Frequency (Hz)

100

10

1

Current Noise pA/√Hz

Voltage Noise nV/√Hz

10

2

10

3

10

4

10

5

10

6

10

7

Current Noise

Voltage Noise

2.5pA/√Hz

2.3nV/√Hz