TEXAS INSTRUMENTS OPA3684 Technical data

6
3
0

–3
–6

–9
–12
–15
–18
–21
–24

Normalized Gain (3dB/div)

RF = 800Ω

G = 100

G = 50

G = 20

G = 10

G = 2

G = 1

10 100 200

BW (MHz) vs GAIN

G = 5

MHz

查询DEM-OPA368XD供应商

Low-Power, Triple Current-Feedback

OPERATIONAL AMPLIFIER With Disable

O

OPA3684

P

A

3

6

8

4

SBOS241A – MAY 2002 – REVISED SEPTEMBER 2002

FEATURES

● MINIMAL BANDWIDTH CHANGE VERSUS GAIN

● 170MHz BANDWIDTH: G = +2

● > 120MHz BANDWIDTH TO GAIN > +10

● LOW DISTORTION: < –82dBc at 5MHz

● HIGH OUTPUT CURRENT: 120mA

● SINGLE +5V TO +12V SUPPLY OPERATION

● DUAL ±2.5V TO ±6.0V SUPPLY OPERATION

● LOW SUPPLY CURRENT: 1.7mA/ch

● LOW SHUTDOWN CURRENT: 100µA/ch

DESCRIPTION

The OPA3684 provides a new level of performance in low-power,
wideband, current-feedback (CFB) amplifiers. This CFB
plifier among the first to use an internally closed-loop input buffer
stage that enhances performance significantly over earlier low­power CFB amplifiers. While retaining the benefits of very low
power operation, this new architecture provides many of the
benefits of a more ideal CFB amplifier. The closed-loop input stage
buffer gives a very low and linearized impedance path at the
inverting input to sense the feedback error current. This improved
inverting input impedance retains exceptional bandwidth to much
higher gains and improves harmonic distortion over earlier solu­tions limited by inverting input linearity. Beyond simple high- gain
applications, the OPA3684 CFB

amplifier permits the gain

PLUS

setting element to be set with considerable freedom from amplifier
bandwidth interaction. This allows frequency response peaking
elements to be added, multiple input inverting summing circuits to

PLUS

am-

APPLICATIONS

● RGB LINE DRIVERS

● LOW-POWER BROADCAST VIDEO DRIVERS

● EQUALIZING FILTERS

● MULTICHANNEL SUMMING AMPLIFIERS

● PROFESSIONAL CAMERAS

● ADC INPUT DRIVERS

have greater bandwidth, and low-power line drivers to meet the
demanding requirements of studio cameras and broadcast video.

The output capability of the OPA3684 also sets a new mark in
performance for low-power current-feedback amplifiers. Delivering
a full ±4Vp-p swing on ±5V supplies, the OPA3684 also has the
output current to support > ±3Vp-p into 50Ω. This minimal output
headroom requirement is complemented by a similar 1.2V input
stage headroom giving exceptional capability for single +5V opera­tion.

The OPA3684’s low 1.7mA/ch supply current is precisely trimmed
at 25°C. This trim, along with low shift over temperature and supply
voltage, gives a very robust design over a wide range of operating
conditions. System power may be further reduced by using the
optional disable control pin. Leaving this disable pin open, or holding
it HIGH, gives normal operation. If pulled LOW, the OPA3684 supply
current drops to less than 100µA/ch while the I/O pins go to a high
impedance state.

V+

V–

I

ERR

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

R

G

Low-Power Amplifier

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

Patent Pending

1 of 3 Channels

Z

(S)

R

F

+

I

ERR

V

O

Copyright © 2002, Texas Instruments Incorporated

www.ti.com

ABSOLUTE MAXIMUM RATINGS

Power Supply ............................................................................... ±6.5V

Internal Power Dissipation ................................. See Thermal Information

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

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

Storage Temperature Range: ID, IDBQ ........................ –40°C to +125°C

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

Junction Temperature (T

ESD Rating: HBM ............................................................................ 1900V

CDM ........................................................................... 1500V

NOTE: (1) Stresses above these ratings may cause permanent damage.
Exposure to absolute maximum conditions for extended periods may degrade
device reliability.

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

J

(1)

DC

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru-

S

ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

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 its published specifications.

OPA3684 RELATED PRODUCTS

SINGLES DUALS TRIPLES QUADS FEATURES

OPA684 OPA2684 — OPA4684 Low-Power CFB
OPA691 OPA2691 OPA3691 — High Slew Rate CFB
OPA685 ———> 500MHz CFB
OPA692 — OPA3692 — Fixed-Gain Video Buffers

plus

PACKAGE/ORDERING INFORMATION

PRODUCT PACKAGE-LEAD DESIGNATOR

PACKAGE TEMPERATURE PACKAGE ORDERING TRANSPORT

OPA3684 SO-14 D –40°C to +85°C OPA3684 OPA3684ID Rails, 58

(1)

"""""OPA3684IDR Tape and Reel, 2500

OPA3684 SSOP-16 DBQ –40°C to +85°C OPA3684 OPA3684IDBQT Tape and Reel, 250

"""""OPA3684IDBQR Tape and Reel, 2500

NOTE: (1) For the most current specifications, and package information, refer to our web site at www.ti.com.

SPECIFIED

RANGE MARKING NUMBER MEDIA, QUANTITY

PIN CONFIGURATION

Top View SO

DIS A

DIS B

DIS C

+V

+Input A

–Input A

Output A

1

2

C

3

4

S

5

6

7

14

Output C

13

–Input C

12

+Input C

11

–V

S

10

9

8

+Input B

–Input B

Output B

BA

Top View SSOP

DIS A

DIS B

DIS C

+V

+Input A

–Input A

Output A

NC

1

2

C

3

4

S

5

6

7

8

16

Output C

15

–Input C

14

+Input C

13

–V

S

12

11

10

9

+Input B

–Input B

Output B

NC

BA

2

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OPA3684

SBOS241A

ELECTRICAL CHARACTERISTICS: VS = ±5V

Boldface limits are tested at +25°C.

RF = 800Ω, RL = 100Ω, and G = +2, unless otherwise noted.

OPA3684ID, IDBQ

TYP MIN/MAX OVER TEMPERATURE

PARAMETER CONDITIONS +25°C +25°C

(1)

70°C

(2)

+85°C

(2)

UNITS MAX

0°C to –40°C to

AC PERFORMANCE (see Figure 1)

Small-Signal Bandwidth (VO = 0.5Vp-p) G = +1, RF = 800Ω 250 MHz typ C

G = +2, RF = 800Ω 170 120 118 117 MHz min B

G = +5, RF = 800Ω 138 MHz typ C
G = +10, R
G = +20, R

Bandwidth for 0.1dB Gain Flatness G = +2, VO = 0.5Vp-p, RF = 800Ω 19 16 14 14 MHz min B

= 800Ω 120 MHz typ C

F

= 800Ω 95 MHz typ C

F

Peaking at a Gain of +1 RF = 800Ω, VO = 0.5Vp-p 1.4 4.8 5.9 6.3 dB max B
Large-Signal Bandwidth G = +2, VO = 4Vp-p 90 MHz typ C
Slew Rate G = –1, V

G = +2,V

Rise-and-Fall Time G = +2, VO = 0.5V Step 3 ns typ C

= 4V Step 780 675 650 575 V/µsminB

O

= 4V Step 750 680 660 650 V/µsminB

O

G = +2, VO = 4VStep 6.8 ns typ C
Harmonic Distortion G = +2, f = 5MHz, VO = 2Vp-p
2nd-Harmonic R

3rd-Harmonic RL = 100Ω –70 –66 –65 –65 dBc max B

= 100Ω –67 –59 –59 –58 dBc max B

L

R

≥ 1kΩ –82 –66 –65 –65 dBc max B

L

RL ≥ 1kΩ –84 –82 –81 –81 dBc max B
Input Voltage Noise f > 1MHz 3.7 4.1 4.2 4.4 nV/√Hz max B
Noninverting Input Current Noise f > 1MHz 9.4 11 12 12.5 pA/√Hz max B
Inverting Input Current Noise f > 1MHz 17 18 18.5 19 pA/√Hz max B
Differential Gain G = +2, NTSC, VO = 1.4Vp, RL = 150Ω 0.04 % typ C
Differential Phase G = +2, NTSC, VO = 1.4Vp, RL = 150Ω 0.02 deg typ C
All Hostile Crosstalk 2 Channels, f = 5MHz 70 dB typ C

3rd-Channel Measured

DC PERFORMANCE

Open-Loop Transimpedance Gain (ZOL)

(4)

VO = 0V, RL = 1kΩ 355 160 155 153 kΩ min A
Input Offset Voltage VCM = 0V ±1.5 ±3.9 ±4.5 ±4.7 mV max A
Average Offset Voltage Drift VCM = 0V ±12 ±12 µV/°CmaxB
Noninverting Input Bias Current VCM = 0V ±5.0 ±12 ±13.5 ±14 µAmaxA
Average Noninverting Input Bias Current Drift VCM = 0V ±25 ±30 nA/°CmaxB
Inverting Input Bias Current VCM = 0V ±5.0 ±17 ±18.5 ±19.5 µAmaxA
Average Inverting Input Bias Current Drift VCM = 0V ±35 ±40 nA°/C max B

INPUT

Common-Mode Input Range

(5)

(CMIR) ±3.75 ±3.65 ±3.65 ±3.6 V min A

Common-Mode Rejection Ratio (CMRR) VCM = 0V 60 53 52 52 dB min A
Noninverting Input Impedance 50 || 2 kΩ || pF typ C
Inverting Input Resistance (RI) Open-Loop, DC 4.0 Ω typ C

OUTPUT

Voltage Output Swing 1kΩ Load ±4.1

±3.9 ±3.9 ±3.8 V min A

Current Output, Sourcing VO = 0 160 120 115 110 mA min A
Current Output, Sinking VO = 0 –120 –100 –95 –90 mA min A
Closed-Loop Output Impedance G = +2, f = 100kHz 0.006 Ω typ C

DISABLE (Disabled LOW)

Power-Down Supply Current (+V
Disable Time V

)V

S

Enable Time V
Off Isolation G = +2, 5MHz 70 dB typ C

= 0 (all channels) –300 –500 –580 –600 µAmaxA

DIS

= +1V, G = +2 4 ms typ C

IN

= +1V, G = +2 40 ns typ C

IN

Output Capacitance in Disable 1.7 pF typ C
Enable Voltage 3.4 3.5 3.6 3.7 V min A
Disable Voltage 1.8 1.7 1.6 1.5 V max A
Control Pin Input Bias Current (DIS) V

= 0V/Channel 80 120 130 135 µAmaxA

DIS

POWER SUPPLY

Specified Operating Voltage ±5 V typ C
Maximum Operating Voltage Range

±6 ±6 ±6VmaxA

Max Quiescent Current VS = ±5V/per Channel 1.7 1.8 1.85 1.85 mA max A
Min Quiescent Current VS = ±5V/per Channel 1.7 1.6 1.55 1.45 mA min A
Power-Supply Rejection Ratio (–PSRR) Input Referred 60 54 53 53 dB typ A

TEMPERATURE RANGE

Specification: D, DBQ
Thermal Resistance,

D SO-14 100 °C/W typ C

θ

JA

Junction-to-Ambient

–40 to +85

DBQ SSOP-16 100 °C/W typ C

NOTES: (1) Junction temperature = ambient for +25°C tested specifications. (2) Junction temperature = ambient at low temperature limit, junction temperature = ambient
+2°C at high temperature limit for over temperature tested specifications. (3) Test levels: (A) 100% tested at +25°C. Over-temperature limits by characterization and
simulation. (B) Limits set by characterization and simulation. (C) Typical value only for information. (4) Current is considered positive out-of-node. V
common-mode voltage. (5) Tested < 3dB below minimum specified CMR at ± CMIR limits.

MIN/

TEST

LEVEL

°C typ C

is the input

CM

(3)

OPA3684

SBOS241A

www.ti.com

3

ELECTRICAL CHARACTERISTICS: VS = +5V

Boldface limits are tested at +25°C.

RF = 1.0kΩ, RL = 100Ω, and G = +2, unless otherwise noted.

OPA3684ID, IDBQ

TYP MIN/MAX OVER TEMPERATURE

PARAMETER CONDITIONS +25°C +25°C

(1)

70°C

(2)

+85°C

(2)

UNITS MAX

0°C to –40°C to

AC PERFORMANCE (see Figure 3)

Small-Signal Bandwidth (V

Bandwidth for 0.1dB Gain Flatness G = +2, V
Peaking at a Gain of +1 R
Large-Signal Bandwidth G = 2, V
Slew Rate G = 2, V
Rise-and-Fall Time G = 2, VO = 0.5V Step 4.3 ns typ C

Harmonic Distortion G = 2, f = 5MHz, V
2nd-Harmonic R

3rd-Harmonic RL = 100Ω to VS/2 –65 –64 –63 –63 dBc max B
Input Voltage Noise f > 1MHz 3.7 4.1 4.2 4.4 nV/√Hz max B

= 0.5Vp-p) G = +1, RF = 1.0kΩ 140 MHz typ C

O

G = +2, R

G = +5, R
G = +10, R
G = +20, RF = 1.0kΩ 75 MHz typ C

= 1.0kΩ, VO < 0.5Vp-p 0.5 2.6 3.4 3.7 dB max B

F

G = 2, V

= 1.0kΩ 110 86 85 82 MHz min B

F

= 1.0kΩ 100 MHz min C

F

= 1.0kΩ 90 MHz typ C

F

< 0.5Vp-p, RF = 1.0kΩ 21 12 11 10 MHz min B

O

= 2Vp-p 86 MHz typ C

O

= 2V Step 380 300 290 285 V/µsminB

O

= 2VStep 4.8 ns typ C

O

= 2Vp-p

= 100Ω to VS/2 –65 –60 –59 –59 dBc max B

L

R

≥ 1kΩ to VS/2 –84 –62 –61 –61 dBc max B

L

≥ 1kΩ to VS/2 –74 –70 –70 –69 dBc max B

R

L

O

Noninverting Input Current Noise f > 1MHz 9.4 11 12 12.5 pA/√Hz max B
Inverting Input Current Noise f > 1MHz 17 18 18.5 19 pA/√Hz max B
Differential Gain G = +2, NTSC, V
Differential Phase G = +2, NTSC, VO = 1.4Vp, RL = 150Ω 0.07 deg typ C

= 1.4Vp, RL = 150Ω 0.04 % typ C

O

All Hostile Crosstalk 2 Channels, f = 5MHz 70 dB typ C

3rd-Channel Measured

DC PERFORMANCE

Open-Loop Transimpedance Gain (ZOL)

(4)

VO = VS/2, RL = 100Ω to VS/2 355 160 155 153 kΩ min A
Input Offset Voltage VCM = VS/2 ±1.0 ±3.4 ±4.0 ±4.2 mV max A
Average Offset Voltage Drift VCM = VS/2 ±12 ±12 µV/°CmaxB
Noninverting Input Bias Current VCM = VS/2 ±5 ±12 ±13.5 ±14 µAmaxA
Average Noninverting Input Bias Current Drift VCM = VS/2 ±25 ±30 nA/°CmaxB
Inverting Input Bias Current VCM = VS/2 ±5 ±13 ±14.5 ±16 µAmaxA
Average Inverting Input Bias Current Drift VCM = VS/2 ±25 ±30 nA°/C max B

INPUT

Least Positive Input Voltage
Most Positive Input Voltage

(5)

(5)

1.25 1.32 1.35 1.38 V max A

3.75 3.68 3.65 3.62 V min A
Common-Mode Refection Ratio (CMRR) VCM = VS/2 58 51 50 50 dB min A
Noninverting Input Impedance 50 || 1 kΩ || pF typ C
Inverting Input Resistance

(RI)

Open-Loop 4.5 Ω typ C

OUTPUT

Most Positive Output Voltage R
Least Positive Output Voltage RL = 1kΩ to VS/2 0.9 1.1 1.1 1.2 V max A

= 1kΩ to VS/2 4.10 3.9 3.9 3.8 V min A

L

Current Output, Sourcing VO = VS/2 80 65 60 55 mA min A
Current Output, Sinking VO = VS/2 70 55 50 45 mA min A
Closed-Loop Output Impedance G = +2, f = 100kHz Ω typ C

DISABLE (Disabled LOW)

Power-Down Supply Current (+V
Off Isolation F = 5.0MHz 70 dB typ C

)V

S

= 0 (all channels) –300 µA typ C

DIS

Output Capacitance in Disable 1.7 pF typ C
Turn-On Glitch G = +2, RL = 150Ω, VIN = VS/2 mV typ C
Turn-Off Glitch G = +2, RL = 150Ω, V
Enable Voltage 3.4 3.5 3.6 3.7 V min A

= VS/2 mV typ C

IN

Disable Voltage 1.8 1.7 1.6 1.5 V max A
Control Pin Input Bias Current (DIS) V

= 0V/Channel 80 120 130 135 µAmaxA

DIS

POWER SUPPLY

Specified Single-Supply Operating Voltage 5 V typ C
Max Single-Supply Operating Voltage Range 12 12 12 V max A
Max Quiescent Current V
Min Quiescent Current VS = +5V/Channel 1.44 1.30 1.20 1.15 mA min A

= +5V/Channel 1.44 1.55 1.55 1.55 mA max A

S

Power-Supply Rejection Ratio (+PSRR) Input Referred 65 dB typ C

TEMPERATURE RANGE

Specification: D, DBQ
Thermal Resistance,

D SO-14 100 °C/W typ C

θ

Junction-to-Ambient

JA

–40 to +85

DBQ SSOP-16 100 °C/W typ C

NOTES: (1) Junction temperature = ambient for +25°C tested specifications. (2) Junction temperature = ambient at low temperature limit, junction temperature = ambient
+1°C at high temperature limit for over temperature tested specifications. (3) Test levels: (A) 100% tested at +25°C. Over-temperature limits by characterization and
simulation. (B) Limits set by characterization and simulation. (C) Typical value only for information. (4) Current is considered positive out-of-node. V
common-mode voltage. (5) Tested < 3dB below minimum specified CMR at ± CMIR limits.

MIN/

TEST

LEVEL

°C typ C

is the input

CM

(3)

4

www.ti.com

OPA3684

SBOS241A

TYPICAL CHARACTERISTICS: VS = ±5V

At TA = +25°C, G = +2, RF = 800Ω, and RL = 100Ω, unless otherwise noted.

NONINVERTING SMALL-SIGNAL

6

VO = 0.5Vp-p

R

= 800Ω

3

F

0

–3
–6
–9

–12

Normalized Gain (3dB/div)

–15

See Figure 1

–18

1 20010 100

9

G = +2

R

= 100Ω

L

6

FREQUENCY RESPONSE

G = 5
G = 10

G = 20

G = 50

G = 100

Frequency (MHz)

NONINVERTING LARGE-SIGNAL

FREQUENCY RESPONSE

G = 1

G = 2

VO = 0.5Vp-p

3

0

–3

–6

–9

Normalized Gain (3dB/div)

–12

3

0

INVERTING SMALL-SIGNAL FREQUENCY RESPONSE
VO = 0.5Vp-p

R

= 800Ω

F

G = –1
G = –2
G = –5
G = –10

See Figure 2

1 20010 100

Frequency (MHz)

INVERTING LARGE-SIGNAL FREQUENCY RESPONSE

G = –1

R

= 100Ω

L

G = –16

VO = 0.5Vp-p

1Vp-p

VO = 1Vp-p

3

Gain (dB)

0

See Figure 1

–3

1 20010 100

Frequency (MHz)

0.8

0.6

0.4

0.2
0

–0.2
–0.4

Output Voltage (200mV/div)

–0.6
–0.8

NONINVERTING PULSE RESPONSE

G = +2

Large-Signal Right Scale

Small-Signal Left Scale

See Figure 1

Time (10ns/div)

VO = 2Vp-p

VO = 5Vp-p

1.6

1.2

0.8

0.4
0

–0.4
–0.8

Output Voltage (400mV/div)

–1.2
–1.6

–3

Gain (dB)

–6

–9

See Figure 2

–12

1 20010 100

Frequency (MHz)

0.8

0.6

0.4

0.2
0

–0.2
–0.4

Output Voltage (200mV/div)

–0.6

See Figure 2

–0.8

INVERTING PULSE RESPONSE

G = –1

Small-Signal Left Scale

Large-Signal Right Scale

Time (10ns/div)

2Vp-p

5Vp-p

1.6

1.2

0.8

0.4
0

–0.4
–0.8

Output Voltage (400mV/div)

–1.2
–1.6

OPA3684

SBOS241A

www.ti.com

5

TYPICAL CHARACTERISTICS: VS = ±5V (Cont.)

At TA = +25°C, G = +2, RF = 800Ω, and RL = 100Ω, unless otherwise noted.

–50
–55
–60
–65
–70
–75
–80

Harmonic Distortion (dBc)

–85
–90

–50

–60

–70

–80

Harmonic Distortion (dBc)

HARMONIC DISTORTION vs LOAD RESISTANCE

VO = 2Vp-p
f = 5MHz
G = +2

2nd-Harmonic

3rd-Harmonic

See Figure 1

100 1k

HARMONIC DISTORTION vs OUTPUT VOLTAGE

f = 5MHz

R

= 100Ω

L

Load Resistance (Ω)

2nd-Harmonic

3rd-Harmonic

–50

–60

–70

–80

Harmonic Distortion (dBc)

–90

–50

–60

–70

–80

Harmonic Distortion (dBc)

HARMONIC DISTORTION vs FREQUENCY

VO = 2Vp-p

R

= 100Ω

L

2nd-Harmonic

3rd-Harmonic

See Figure 1

0.1 20110
Frequency (MHz)

5MHz HARMONIC DISTORTION vs SUPPLY VOLTAGE

VO = 2Vp-p

R

= 100Ω

L

2nd-Harmonic

3rd-Harmonic

–90

0.5 1 5

HARMONIC DISTORTION vs NONINVERTING GAIN

–50
–55
–60
–65
–70
–75
–80

Harmonic Distortion (dBc)

–85
–90

11020

Output Voltage (Vp-p)

2nd-Harmonic

3rd-Harmonic

Noninverting Gain (V/V)

–90

±2.5 ±3 ±3.5 ±4 ±4.5 ±5 ±5.5 ±6

–50
–55
–60
–65
–70
–75
–80

Harmonic Distortion (dBc)

–85
–90

11020

Supply Voltage (±V)

HARMONIC DISTORTION vs INVERTING GAIN

2nd-Harmonic

3rd-Harmonic

Inverting Gain (V/V)

6

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OPA3684

SBOS241A

TYPICAL CHARACTERISTICS: VS = ±5V (Cont.)

2-TONE, 3RD-ORDER

INTERMODULATION DISTORTION

–8 –7 –6 –5 –4 –3 –2 –1453210678

Power at Load (each tone, dBm)

3rd-Order Spurious Level (dBc)

–50

–60

–70

–80

–90

50Ω

+5V

–5V

50Ω

50Ω

P

I

P

O

800Ω

800Ω

OPA3684

20MHz

10MHz

5MHz

1MHz

9

6

3

0

–3

–6

Frequency (MHz)

1 30010 100

SMALL-SIGNAL BANDWIDTH vs C

LOAD

Normalized Gain (dB)

5pF

800Ω

1kΩ

OPA3684

R

S

V

O

+5V

–5V

50Ω

C

L

800Ω

V

I

12pF

100pF

50pF

75pF

20pF

33pF

At TA = +25°C, G = +2, RF = 800Ω, and RL = 100Ω, unless otherwise noted.

INPUT VOLTAGE AND CURRENT NOISE DENSITY

100

Inverting Current Noise

17pA/√Hz

10

Current Noise (pA/√Hz)

Voltage Noise (nV/√Hz)

1

100 10M1k 10k 100k 1M

Noninverting Current Noise

9.4pA/√Hz

Voltage Noise

3.7nV/√Hz

Frequency (Hz)

6

DISABLE TIME

V

DIS

5

4

(V)

DIS

and V

OUT

V

3

V

OUT

2

V

IN = 1VDC

See Figure 1

1

0

01624 86121410

Time (ms)

vs C

R

S

50

LOAD

40

30

(Ω)

S

R

20

10

0

1 10010

OPA3684

SBOS241A

(pF)

C

LOAD

0.5dB Peaking

www.ti.com

–40

G = +2

V

= 0

DIS

–50

–60

–70

DISABLED FEEDTHROUGH

–80

Feedthrough (dB)

–90

–100

See Figure 1

0.1 100110
Frequency (MHz)

7

TYPICAL CHARACTERISTICS: VS = ±5V (Cont.)

At TA = +25°C, G = +2, RF = 800Ω, and RL = 100Ω, unless otherwise noted.

70

CMRR

60

CMRR and PSRR vs FREQUENCY

50

+PSRR

40

30

20

10

Power-Supply Rejection Ratio (dB)

Common-Mode Rejection Ratio (dB)

0

2

10

3

10

4

10

COMPOSITE VIDEO DIFFERENTIAL GAIN/PHASE

0.10

0.09

0.08

Gain = +2

NTSC, Positive Video

0.07

0.06

dG

0.05

0.04

0.03

Differential Gain (%)

Differential Phase (°)

0.02

dP

0.01
0

1423

Number of 150Ω Video Loads

–PSRR

5

10

Frequency (Hz)

OPEN-LOOP TRANSIMPEDANCE GAIN AND PHASE

vs FREQUENCY

120

0

20log (ZOL)

100

80

60

40

∠ Z

OL

–30

–60

–90

–120

Open-Loop Phase (°)

20

Open-Loop Transimpedance Gain (dBΩ)

0

6

10

7

10

8

10

2

10

10310410510610710810

–150

–180

9

Frequency (Hz)

OUTPUT CURRENT AND VOLTAGE LIMITATIONS

5

1W Power

Limit

4
3
2

= 100

L

R

Ω

Ω

0

5

=

L

R

1

(V)

0

O

V

–1
–2
–3

Each

–4

Channel

–5

Ω

= 500

L

R

1W Power

Limit

–150 –100 –50 0 50 100 150

I

(MA)

O

Input Bias Currents (µA)

8

TYPICAL DC DRIFT OVER AMBIENT TEMPERATURE

4
3
2
1
0

Input Offset VoltageNoninverting Input Bias Current

–1
–2

and Offset Voltage (mV)

Inverting Input Bias Current

–3
–4

–50 –25 0 25 50 75 100 125

Ambient T emperature (°C)

www.ti.com

SUPPLY AND OUTPUT CURRENT

200

vs AMBIENT TEMPERATURE

Sourcing Output Current

175

Supply Current

150

Output Current (mA)

125

Sinking Output Current

100

–25 0 25 50 75 100 125

Ambient T emperature (°C)

1.9

1.8

1.7

1.6

Supply Current per Channel (mA)

1.5

OPA3684

SBOS241A