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(R)
OPA 267 7
OPA2677
OPA
267
7
For most current data sheet and other product information, visit www.burr-brown.com
Dual, Wideband, High Output Current OPERATIONAL AMPLIFIER
TM
FEATURES
q WIDEBAND +12V OPERATION: 200MHz (G = +4) q UNITY GAIN STABLE: 220MHz (G = 1) q q q q q HIGH OUTPUT CURRENT: 500mA OUTPUT VOLTAGE SWING: 5V HIGH SLEW RATE: 1800V/s LOW SUPPLY CURRENT: 18mA FLEXIBLE POWER CONTROL
APPLICATIONS
q q q q q q xDSL LINE DRIVER CABLE MODEM DRIVER MATCHED I/Q CHANNEL AMPLIFIER BROADBAND VIDEO LINE DRIVER ARB LINE DRIVER PERFORMANCE UPGRADE TO AD8017
DESCRIPTION
The OPA2677 provides the high output current and low distortion required in emerging ADSL and HDSL2 driver applications. Operating on a single +12V supply, the OPA2677 consumes a low 9mA/chan quiescent current to deliver a very high 500mA peak output current. Guaranteed output current supports even the most demanding ADSL CPE requirements with > 380mA minimum output current with low harmonic distortion. Differential driver applications will deliver < -85dBc distortion at the peak upstream power levels of full rate ADSL. The high 200MHz bandwidth will also support the most demanding VDSL line driver requirements.
Power control features are included in the SO-14 package version to allow system power to be minimized. Two logic control lines allow four quiescent power settings. These include full power, power cutback for short loops, idle state for no signal transmission but line match maintenance, and shutdown for power off with a high impedance output. Specified on 6V supplies (to support +12V operation), the OPA2677 will also support a single +5V or dual 5V supply. Video applications will benefit from its very high output current to drive up to 10 parallel video loads (15) with < 0.1%/ 0.1 dG/dO non-linearity.
OPA2677 RELATED PRODUCTS
SINGLES
+12V
DUALS OPA2681 OPA2607
TRIPLES OPA3681 --
NOTES Single +12V Capable 12V Capable
OPA681
20
1/2 OPA2677
--
324
17.4 1:1.7
AFE Output
+6.0V 2Vp-p
2k
1F 17.7Vp-p 15Vp-p Twisted Pair 100 82.5 324 17.4
2k
20
1/2 OPA2677
Single Supply ADSL Upstream Driver
International Airport Industrial Park * Mailing Address: PO Box 11400, Tucson, AZ 85734 * Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 * Tel: (520) 746-1111 Twx: 910-952-1111 * Internet: http://www.burr-brown.com/ * Cable: BBRCORP * Telex: 066-6491 * FAX: (520) 889-1510 * Immediate Product Info: (800) 548-6132
(c)
2000 Burr-Brown Corporation
PDS-1593A
Printed in U.S.A. April, 2000
SBOS126
SPECIFICATIONS: VS = 6V
At TA = +25C, G = +4, RF = 402, and RL = 100, unless otherwise noted. See Figure 1 for AC performance only OPA2677U, H, N TYP +25C(2) GUARANTEED 0C to 70C(3) -40C to +85C(3) MIN/ TEST MAX LEVEL(1) typ typ typ typ typ typ typ typ typ typ typ typ typ typ typ typ typ typ min max max max max max max min min typ min max min min typ min min typ max min max typ typ typ typ typ typ typ typ typ typ max max min min C C C C C C C C C C C C C C C C C C A A B A B A B A A C B B A A C A A C A A A C C C C C C C C C C A A A A
PARAMETER AC PERFORMANCE (Figure 1) Small-Signal Bandwidth (VO = 0.5Vp-p)
CONDITIONS G = +1, RF = 511 G = +2, RF = 475 G = +4, RF = 402 G = +8, RF = 250 G = +4, VO = 0.5Vp-p G = +4, VO = 5Vp-p G = +4, 5V Step G = +4, VO = 2V Step VO = 2Vp-p, 5MHz, 100 VO = 2Vp-p, 100kHz, 100
+25C 220 200 200 250 80 200 1800 2 74 96 2.0 14 21 0.03 0.05 0.01 0.04 -80 135 1.0 10 10
UNITS MHz MHz MHz MHz MHz MHz V/s ns dB dB nV/Hz pA/Hz pA/Hz % % degrees degrees dB
Bandwidth for 0.1dB Gain Flatness Large-Signal Bandwidth Slew Rate Rise/Fall Time Spurious Free Dynamic Range Input Voltage Noise Non-Inverting Input Current Noise Inverting Input Current Noise Differential Gain Differential Phase Channel-to-Channel Crosstalk DC PERFORMANCE(4) Open-Loop Transimpedance Gain Input Offset Voltage Average Offset Voltage Drift Non-Inverting Input Bias Current Average Non-Inverting Input Bias Current Drift Inverting Input Bias Current Average Inverting Input Bias Current Drift INPUT(4) Common-Mode Input Range (CMIR)(5) Common-Mode Rejection Ratio(CMRR) Non-Inverting Input Impedance Minimum Inverting Input Resistance Maximum Inverting Input Resistance OUTPUT(4) Voltage Output Swing
NTSC, G = +2, RL = 150 NTSC, G = +2, RL = 37.5 NTSC, G = +2, RL = 150 NTSC, G = +2, RL= 37.5 f = 5MHz, Input Referred VO = 0V, RL = 100 VCM = 0V VCM = 0V VCM = 0V VCM = 0V VCM = 0V VCM = 0V
95 5.5 30 30
90 7 35 45 250 45 250 4.1 51
85 7.5 40 55 350 55 350 4.0 50
k mV V/C A nA/C A nA/C V dB k || pF V V V mA mA V V A mA mA mA mA k || pF ns mV dB V V mA mA dB C C/W C/W C/W
VCM = 0V, Input Referred Open-Loop Open-Loop No Load RL = 100 RL = 25 VO = 0 VO = 0 G = +4, f = 100kHz A0, A1 A0, A1 A0 = A1 = 0 A0 = 1, A1 = 1 A0 = 0, A1 = 1 A0 = 1, A1 = 0 A0 = 0, A1 = 0 G = +4, f = 100kHz 10% to 90% Change Inputs at GND G = +4, 1MHz, A0 = 0, A1 = 0
4.5 55 250 || 2 22 22 5.1 5.0 4.8 500 500 0.003 1.8 2.3 50 18 13.5 3.8 0.8 0.1 100 || 4 200 20 85 6
4.2 52 14 30 4.9 4.8 380 380
4.8 4.7 340 340
4.7 4.5 290 290
Current Output, Sourcing Current Output, Sinking Closed-Loop Output Impedance Power Control (SO-14 only) Maximum Logic 0 Minimum Logic 1 Logic Input Current Supply Current at Full Power Supply Current at Power Cutback Supply Current at Idle Power Supply Current at Shutdown Output Impedance in Idle Power Output Impedance in Shutdown Supply Current Step Time Output Switching Glitch Shutdown Isolation POWER SUPPLY Specified Operating Voltage Maximum Operating Voltage Maximum Quiescent Current Minimum Quiescent Current Power Supply Rejection Ratio (PSRR) TEMPERATURE RANGE Specification: U, N Thermal Resistance, JA U SO-8 H PSO-8 N SO-14
1.0 2.6 100
VS = 6V, Full Power VS = 6V, Full Power f = 100kHz, Input Referred
18 18 56 -40 to +85
6.3 18.5 17.5 52
6.3 19 16.6 50
6.3 19.5 16.3 49
Junction-to-Ambient
125 55 100
NOTES: (1) Test Levels: (A) 100% tested at 25C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation. (C) Typical value only for information. (2) Junction temperature = ambient for 25C guaranteed specifications. (3) Junction temperature = ambient at low temperature limit: junction temperature = ambient +23C at high temperature limit for over temperature guaranteed specifications. (4) Current is considered positive-out-of node. VCM is the input common-mode voltage. (5) Tested < 3dB below minimum CMRR limit at CMIR limits.
(R)
OPA2677
2
SPECIFICATIONS: VS = +5V
At TA = +25C, G = +2, RF = 453, and RL = 100, unless otherwise noted. See Figure 2 for AC performance only OPA2677U, H, N TYP +25C(2) GUARANTEED 0C to 70C(3) -40C to +85C(3) MIN/ TEST MAX LEVEL(1) typ typ typ typ typ typ typ typ typ typ typ typ typ typ min max max max max max max min max min typ min max min min max max min min typ max min max typ typ typ typ typ typ typ typ typ typ max max min typ C C C C C C C C C C C C C C A A B A B A B A A A C B B A A A A A A C A A A C C C C C C C C C C A A A C
PARAMETER AC PERFORMANCE (Figure 2) Small-Signal Bandwidth (VO = 0.5Vp-p)
CONDITIONS G = +1, RF = 536 G = +2, RF = 511 G = +4, RF = 453 G = +8, RF = 332 G = +4, VO = 0.5Vp-p G = +4, VO = 2Vp-p G = +4, 2V Step G = +4, VO = 2V Step VO = 2Vp-p, 5MHz, 100 VO = 2Vp-p, 100kHz, 100
+25C 160 150 160 160 70 100 1100 2 67 87 2.0 14 21 -80 125 0.8 10 10
UNITS MHz MHz MHz MHz MHz MHz V/s ns dB dB nV/Hz pA/Hz pA/Hz dB
Bandwidth for 0.1dB Gain Flatness Large-Signal Bandwidth Slew Rate Rise/Fall Time Spurious Free Dynamic Range Input Voltage Noise Non-Inverting Input Current Noise Inverting Input Current Noise Channel-to-Channel Crosstalk DC Open-Loop Transimpedance Gain Input Offset Voltage Average Offset Voltage Drift Non-Inverting Input Bias Current Average Non-Inverting Input Bias Current Drift Inverting Input Bias Current Average Inverting Input Bias Current Drift INPUT(4) Most Positive Input Voltage Least Positive Input Voltage Common-Mode Rejection Ratio(CMRR) Non-Inverting Input Impedance Minimum Inverting Input Resistance Maximum Inverting Input Resistance OUTPUT(4) Most Positive Output Voltage Least Positive Output Voltage Current Output, Sourcing Current Output, Sinking Closed-Loop Output Impedance Power Control (SO-14 only) Maximum Logic 0 Minimum Logic 1 Logic Input Current Supply Current at Full Power Supply Current at Power Cutback Supply Current at Idle Power Supply Current at Shutdown Output Impedance in Idle Power Output Impedance in Shutdown Supply Current Step Time Output Switching Glitch Shutdown Isolation POWER SUPPLY Specified Operating Voltage Maximum Operating Voltage Maximum Quiescent Current Minimum Quiescent Current Power Supply Rejection Ratio (PSRR) TEMPERATURE RANGE Specification: U, N Thermal Resistance, JA U SO-8 H PSO-8 N SO-14 PERFORMANCE(4)
f = 5MHz, Input Referred VO = 0V, RL = 100 VCM = 0V VCM = 0V VCM = 0V VCM = 0V VCM = 0V VCM = 0V
90 4.0 30 30
85 5.5 35 45 250 45 250 3.3 1.7 49
80 6.0 40 55 350 55 350 3.2 1.8 48
k mV V/C A nA/C A nA/C V V dB k || pF V V V V mA mA V V A mA mA mA mA k || pF ns mV dB V V mA mA dB C C/W C/W C/W
VCM = 2.5V, Input Referred Open-Loop Open-Loop No Load RL = 100 No Load RL = 100 VO = 2.5V VO = 2.5V G = +4, f = 100kHz A0, A1 A0, A1 A0 = A1 = 0 A0 = 1, A1 = 1 A0 = 0, A1 = 1 A0 = 1, A1 = 0 A0 = 0, A1 = 0 G = +4, f = 100kHz 10% to 90% Change Inputs at GND G = +4, 1MHz, A0 = 0, A1 = 0
3.7 1.3 52 250 || 2 29 29 4.2 4.0 0.8 1.0 300 300 0.02 1.8 2.3 50 13.5 11 2 0.8 0.1 100 || 4 200 20 85 +5
3.4 1.6 50 20 37 4.0 3.9 1.0 1.1 200 200
3.9 3.8 1.1 1.2 160 160
3.7 3.6 1.3 1.5 120 120
1.0 2.6 100
VS = +5V, Full Power VS = +5V, Full Power f = 100kHz, Input Referred
13.5 13.5 52 -40 to +85
+12.6 14.5 12.5
+12.6 15 12
+12.6 15.5 11.5
Junction-to-Ambient
125 55 100
NOTES: (1) Test Levels: (A) 100% tested at 25C. Over temperature limits by characterization and simulation. (B) Limits set by characterization and simulation. (C) Typical value only for information. (2) Junction temperature = ambient for 25C guaranteed specifications. (3) Junction temperature = ambient at low temperature limit: junction temperature = ambient +23C at high temperature limit for over temperature guaranteed specifications. (4) Current is considered positive-out-of node. VCM is the input common-mode voltage. (5) Tested < 3dB below minimum specified CMRR at CMIR limits.
(R)
3
OPA2677
ABSOLUTE MAXIMUM RATINGS
Power Supply .............................................................................. 6.5VDC Internal Power Dissipation(1) ............................ See Thermal Information Differential Input Voltage .................................................................. 1.2V Input Voltage Range ............................................................................ VS Storage Temperature Range: U, N, H ........................... -40C to +125C Lead Temperature (soldering, 10s) .............................................. +300C Junction Temperature (TJ ) ........................................................... +175C NOTE:: (1) Packages must be derated based on specified JA. Maximum TJ must be observed.
PIN CONFIGURATIONS
Top View
OPA2677U, H Out A -In A +In A -VS 1 2 3 4 8 7 6 5 +VS Out B -In B +In B
SO-8, PSO-8
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.
OPA2677N -In A +In A A0 -VS A1 +In B -In B 1 2 3 4 5 6 7 Power Control 14 Out A 13 NC 12 NC 11 +VS 10 NC 9 8 NC Out B
SO-14
PACKAGE/ORDERING INFORMATION
PACKAGE DRAWING NUMBER 182 SPECIFIED TEMPERATURE RANGE -40C to +85C PACKAGE MARKING OPA2677U ORDERING NUMBER(1) OPA2677U OPA2677U/2K5 TRANSPORT MEDIA Rails Tape and Reel
PRODUCT OPA2677U
PACKAGE SO-8 Surface Mount
"
OPA2677H
"
PSO-8 Surface Mount
"
182-1
"
-40C to +85C
"
OPA2677H
-- -- -- --
Rails Tape and Reel Rails Tape and Reel
"
OPA2677N
"
SO-14 Surface Mount
"
235
"
-40C to -85C
"
OPA2677N
"
"
"
"
"
NOTE: (1) Models with a slash (/) are available only as Tape and Reel in the quantity indicated after the slash (e.g. /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of the OPA2677U/2K5 will get a single 2500-piece Tape and Reel.
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.
(R)
OPA2677
4
TYPICAL PERFORMANCE CURVES: VS = 6V
At TA = +25C, G = +4, RF = 402, and RL = 100, unless otherwise noted. See Figure 1 for AC performance only
NON-INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 3
Normalized Gain (dB)
INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 VO = 0.5Vp-p G = -8, RF = 280 G = -2, RF = 422 G = -8, RF = 280 -9 -12 -15 -18 G = -4, RF = 383
VO = 0.5Vp-p
G = +8 RF = 250
Normalized Gain (dB)
3 0 -3 -6
0 -3 -6 -9 -12 -15 -18 0 100 200 300 400 500 Frequency (MHz) See Figure 1. G = +4 RF = 402 G = +2 RF = 475 G = +1 RF = 511
0
100
200
300
400
500
Frequency (MHz)
NON-INVERTING LARGE-SIGNAL FREQUENCY RESPONSE 18 15 12 9
Gain (dB)
INVERTING LARGE-SIGNAL FREQUENCY RESPONSE 18 15 12 9 6 3 0 -3 -6 -9 -12 -15 VO = 10Vp-p VO 1Vp-p G = -4 RF = 383
G = +4, See Figure 1 VO = 2Vp-p VO 1Vp-p
VO = 8Vp-p VO = 5Vp-p
3 0 -3 -6 -9 -12 -15 0 100 200 300 400 500 Frequency (MHz) VO = 8Vp-p VO = 10Vp-p
Gain (dB)
6
0
100
200
300
400
500
Frequency (MHz)
NON-INVERTING PULSE RESPONSE G = +4
INVERTING PULSE RESPONSE
Output Voltage (100mV/div)
Output Voltage (1V/div)
Output Voltage (1V/div)
5Vp-p Large Signal 200mVp-p Small Signal Right Scale
5Vp-p
Large Signal 200mVp-p Small Signal Right Scale
Time (5ns/div)
Time (5ns/div)
Output Voltage (100mV/div)
(R)
Left Scale
Left Scale
5
OPA2677
TYPICAL PERFORMANCE CURVES: VS = 6V
(Cont.)
At TA = +25C, G = +4, RF = 402, and RL = 100, unless otherwise noted. See Figure 1 for AC performance only
HARMONIC DISTORTION vs FREQUENCY -60 -65 VO = 2Vp-p RL = 100 -60 -65
HARMONIC DISTORTION vs OUTPUT VOLTAGE F = 5MHz RL = 100
Harmonic Distortion (dBc)
-70 -75 -80 -85 3rd-Harmonic -90 -95 -100 0.1 1 Frequency (MHz) 10 20 Single Channel. See text for differential performance.
Harmonic Distortion (dBc)
2nd-Harmonic
2nd-Harmonic
-70 -75 -80 -85 3rd-Harmonic -90 -95 Single Channel. See text for differential performance. -100 0.1 1 Output Voltage (Vp-p) 10
HARMONIC DISTORTION vs NON-INVERTING GAIN -60 -65 VO = 2Vp-p f = 5MHz RL = 100 -60 2nd-Harmonic -65
HARMONIC DISTORTION vs INVERTING GAIN VO = 2Vp-p f = 5MHz RL = 100 2nd-Harmonic
Harmonic Distortion (dBc)
Harmonic Distortion (dBc)
-70 -75 -80 -85
-70 -75 -80 -85 -90 -95
3rd-Harmonic
3rd-Harmonic -90 -95 Single Channel (see text for differential performance). -100 1 Gain Magnitude (V/V) 10
Single Channel (see text for differential performance). -100 1 Gain Magnitude (-V/V) 10
HARMONIC DISTORTION vs LOAD RESISTANCE -60 2nd-Harmonic
2-TONE, 3rd-ORDER INTERMODULATION SPURIOUS -60
3rd-Order Spurious Level (dBc)
-65
VO = 2Vp-p f = 5MHz
Figure 1 -65 -70 -75 10MHz -80 -85 -90 -95 -100 Single Channel. See text for differential performance. -10 -5 0
20MHz
Harmonic Distortion (dBc)
-70 -75 -80 -85 -90 -95 -100 10 100 Load Resistance () 1000 Single Channel. See text for differential performance. 3rd-Harmonic
5MHz
1MHz
5
10
Single-Tone Load Power (dBm)
(R)
OPA2677
6
TYPICAL PERFORMANCE CURVES: VS = 6V
(Cont.)
At TA = +25C, G = +4, RF = 402, and RL = 100, unless otherwise noted. See Figure 1 for AC performance only
MAXIMUM OUTPUT SWING vs LOAD RESISTANCE 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 10
Figure 1 100 Load Resistance () 1000
OUTPUT VOLTAGE AND CURRENT LIMITATIONS 6 5 4 3 RL = 100 2 RL = 50 RL = 10 1 0 RL = 25 -1 1W Internal Power Single Ch. -2 -3 -4 1W Internal Power Single Ch. -5 -6 -600 -400 -200 0 200 400 600 IO (mA)
Output Voltage (V)
VO (V)
OUTPUT VOLTAGE AND CURRENT LIMITATIONS 100
Crosstalk, Input Referred (dB)
CHANNEL-TO-CHANNEL CROSSTALK -60 -65 -70 -75 -80 -85 -90 -95 -100
Voltage Noise nV/Hz Current Noise pA/Hz
Inverting Current Noise Non-Inverting Current Noise
20pA/Hz 15pA/Hz
10
Voltage Noise
2nV/Hz
1 102 103 104 105 106 107 Frequency (Hz)
106
107 Frequency (Hz)
108
RECOMMENDED RS vs CAPACITIVE LOAD 90
Normalized Gain to Capacitive Load (dB)
FREQUENCY RESPONSE vs CAPACITIVE LOAD 2 CL = 10pF 0 -2 -4 -6
402
80 70 60
RS ()
CL = 100pF
CL = 22pF
50 40 30 20 10 0 1 10 100 1000 Capacitive Load (pF)
1/2 OPA2677
RS
CL = 47pF
1k
CL
-8 -10 1M
133
1k is optional.
10M
100M
1G
Frequency (Hz)
(R)
7
OPA2677
TYPICAL PERFORMANCE CURVES: VS = 6V
(Cont.)
At TA = +25C, G = +4, RF = 402, and RL = 100, unless otherwise noted. See Figure 1 for AC performance only
CMRR AND PSRR vs FREQUENCY 70
OPEN-LOOP TRANSIMPEDANCE GAIN AND PHASE 120 0 -45 -90 -135 -180 -225 -270 109
Transimpedance Phase (45/div) Transimpedance Gain (20dB/div)
Power Supply Rejection Ratio (dB) Common-Mode Rejection Ratio (dB)
60 50 40 -PSRR 30 20 10 0 103 104 105 106
CMRR
100 80 60 40 20 0
+PSRR
107
108
104
105
106
107
108
Frequency (Hz)
Frequency (Hz)
CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY 100
COMPOSITE VIDEO dG/d 0.14 0.12 0.10.
dG/d (%/)
Output Impedance Magnitude ()
10 1 0.1 0.01 0.001
G = +2 RF = 475 VS = 5V
d, Positive Video d, Negative Video
0.08 0.06 0.04 dG, Positive Video 0.02 dG, Negative Video 0.00
104
105
106
107
108
109
1
2
3
4
5
6
7
8
9
10
Frequency (Hz)
Number of 150 Loads
NON-INVERTING OVERDRIVE RECOVERY 8 Input 6
Output Voltage (2V/div)
INVERTING OVERDRIVE RECOVERY 4 3
Output Voltage (2V/div) Input Voltage (1V/div)
8 6 4 2 0 -2 -4 -6 Output -8 Time (20ns/div) Input
G = -4 RL = 100
4 3
Input Voltage (1V/div)
4 2 0 -2 -4 -6 -8 G = +4 RL = 100 Figure 1 Time (20ns/div) Output
2 1 0 -1 -2 -3 -4
2 1 0 -1 -2 -3 -4
(R)
OPA2677
8
TYPICAL PERFORMANCE CURVES: VS = 6V
(Cont.)
At TA = +25C, G = +4, RF = 402, and RL = 100, unless otherwise noted. See Figure 1 for AC performance only
TYPICAL DC ERROR DRIFT vs TEMPERATURE 10 8 Input Offset Voltage (mV) Input Bias Current (A) 6 4 2 0 Input Offset Voltage -2 -4 -6 -8 -10 -55 -35 -15 5 25 45 65 85 105 125 Inverting Bias Current Non-Inverting Bias Current
Output Current (mA)
SUPPLY AND OUTPUT CURRENT vs TEMPERATURE 600 550 500 450 400 350 300 250 200 150 100 -55 -35 -15 5 25 45 65 85 105 125 0 Temperature (C) 10 Supply Current, Full Power 20 Sinking Output Current Sourcing Output Current 40
Output Current (mA)
(R)
50
30
Ambient Temperature (C)
CMIR AND OUTPUT VOLTAGE vs SUPPLY VOLTAGE 6 No Load 5 Output Voltage 4 3 2 1 0 2 3 4 Supply Voltage (V) 5 6 +V Input Voltage -V Input Voltage
Voltage Range (V)
9
OPA2677
TYPICAL PERFORMANCE CURVES: VS = +5V
At TA = +25C, G = +4, RF = 453, and RL = 100 to VS/2, unless otherwise noted. See Figure 2.
NON-INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 3
Normalized Gain (dB)
INVERTING SMALL-SIGNAL FREQUENCY RESPONSE 6 3
Normalized Gain (dB)
0 -3 -6 -9 -12 -15 -18 0 50 100 150 See Figure 2. G = +4 RF = 453 G = +2 RF = 511
G = +1 RF = 536
0 -3 -6 -9 -12 -15 -18 G = -1 RF = 536
G = -8 RF = 332
G = +8 RF = 332
G = -4 RF = 453 G = -2 RF = 511 0 50 100 150 200 250
200
250
Frequency (MHz)
Frequency (MHz)
SMALL-SIGNAL PULSE RESPONSE 400 VO = 500mVp-p
Output Voltage (400mV/div)
LARGE-SIGNAL PULSE RESPONSE 1.6 1.2 0.8 0.4 0 -0.4 -0.8 -1.2 See Figure 2. Time (5ns/div) VO = 2Vp-p
Output Voltage (100mV/div)
300 200 100 0 -100 -200 -300 See Figure 2. -400 Time (5ns/div)
-1.6
RECOMMENDED RS vs CAPACITIVE LOAD 50 2 45 40 35
FREQUENCY RESPONSE vs CAPACITIVE LOAD CL = 10pF CL = 100pF -2
5k +5V 0.1F VI 5k OPA2677
1/2
Normalized Gain to Capacitive Load (dB)
0
RS ()
30 25 20 15 10 5 0 1 10 100 1000 Capacitive Load (pF)
CL = 22pF
-4 -6
RS CL
VO 1k
CL = 47pF
453
-8 -10 1M
150 0.1F
1k Load Optional.
10M
100M
1G
Frequency (Hz)
(R)
OPA2677
10
TYPICAL PERFORMANCE CURVES: VS = +5V
(Cont.)
At TA = +25C, G = +4, RF = 453, and RL = 100, unless otherwise noted. See Figure 2 for AC performance only.
HARMONIC DISTORTION vs FREQUENCY -50 -55 VO = 2Vp-p RL = 100 to VS/2 2nd-Harmonic -65 -70 -75 3rd-Harmonic -80 -85 Single Channel. See Figure 2. -90 0.1 1 Frequency (MHz) 10 20 -90 0.1 -50 -55
Harmonic Distortion (dBc)
HARMONIC DISTORTION vs OUTPUT VOLTAGE f = 5MHz RL = 100 to VS/2
Harmonic Distortion (dBc)
-60
-60 -65 2nd-Harmonic -70 -75 -80 -85 3rd-Harmonic 1 Output Voltage (Vp-p) 2 Single Channel. See Figure 2.
HARMONIC DISTORTION vs NON-INVERTING GAIN -50 -55
Harmonic Distortion (dBc)
HARMONIC DISTORTION vs INVERTING GAIN -50 -55 Harmonic Distortion (dBc) VO = 2Vp-p f = 5MHz RL = 100 to VS/2 2nd-Harmonic
-60 -65 -70 -75
VO = 2Vp-p f = 5MHz RL = 100 to VS/2 2nd-Harmonic
-60 -65 -70 -75 -80 -85
3rd-Harmonic
3rd-Harmonic -80 -85 Single Channel -90 1 Gain Magnitude (V/V) 10
Single Channel -90 -1 Gain (V/V) -10
HARMONIC DISTORTION vs LOAD RESISTANCE -50 -50 VO = 2Vp-p f = 5MHz 2nd-Harmonic
2-TONE, 3rd-ORDER SPURIOUS LEVEL Single Channel. See Figure 2.
3rd-Order Spurious Level (dBc)
-55
Harmonic Distortion (dBc)
-55 -60 -65 -70 -75 -80 -85 -90 5MHz -10 -5 0 1MHz 5 10 10MHz 20MHz
-60 -65 -70 -75 -80 -85 Single Channel. -90 10 3rd-Harmonic
100 Load Resistance ()
1000
Single-Tone Load Power (dBm)
(R)
11
OPA2677
APPLICATIONS INFORMATION
WIDEBAND CURRENT FEEDBACK OPERATION The OPA2677 gives the exceptional AC performance of a wideband current feedback op amp with a highly linear, high power output stage. Requiring only 9mA/ch. quiescent current, the OPA2677 will swing to within 1V of either supply rail and deliver in excess of 380mA guaranteed at room temperature. This low output headroom requirement, along with supply voltage independent biasing, gives remarkable single (+5V) supply operation. The OPA2677 will deliver greater than 150MHz bandwidth driving a 2Vp-p output into 100 on a single +5V supply. Previous boosted output stage amplifiers have typically suffered from very poor crossover distortion as the output current goes through zero. The OPA2677 achieves a comparable power gain with much better linearity. The primary advantage of a current feedback op amp over a voltage feedback op amp is that AC performance (bandwidth and distortion) is relatively independent of signal gain. Figure 1 shows the DC coupled, gain of +4, dual power supply circuit configuration used as the basis of the 6V Specifications and Typical Performance Curves. For test purposes, the input impedance is set to 50 with a resistor to ground and the output impedance is set to 50 with a series output resistor. Voltage swings reported in the specifications are taken directly at the input and output pins while load powers (dBm) are defined at a matched 50 load. For the circuit of Figure 1, the total effective load will be 100 || 537 = 84.
Figure 2 shows the AC coupled, gain of +4, single supply circuit configuration used as the basis of the +5V Specifications and Typical Performance Curves. Though not a "railto-rail" design, the OPA2677 requires minimal input and output voltage headroom compared to other very wideband current feedback op amps. It will deliver a 3Vp-p output swing on a single +5V supply with greater than 100MHz bandwidth. The key requirement of broadband single supply operation is to maintain input and output signal swings within the usable voltage ranges at both the input and the output. The circuit of Figure 2 establishes an input midpoint bias using a simple resistive divider from the +5V supply (two 806 resistors). The input signal is then AC coupled into this midpoint voltage bias. The input voltage can swing to within 1.3V of either supply pin, giving a 2.4Vp-p input signal range centered between the supply pins. The input impedance matching resistor (57.6) used for testing is adjusted to give a 50 input match when the parallel combination of the biasing divider network is included. The gain resistor (RG) is AC coupled, giving the circuit a DC gain of +1--which puts the input DC bias voltage (2.5V) on the output as well. The feedback resistor value has been adjusted from the bipolar supply condition to re-optimize for a flat frequency response in +5V, gain of +4, operation. Again, on a single +5V supply, the output voltage can swing to within 1V of either supply pin while delivering more than 200mA output current. A demanding 100 load to a midpoint bias is used in this characterization circuit. The new output stage used in the OPA2677 can deliver large bipolar output currents into this midpoint load with minimal crossover distortion, as shown by the +5V supply, harmonic distortion plots.
0.1F
+6V +VS
6.8F +
+5V +VS
50 Source
0.1F 806
50 Load
+
6.8F
VI
50
1/2 OPA2677
VO
50
0.1F VI VO 100 VS/2
57.6
806
1/2 OPA2677
RF 453
RF 402 RG 133 + -VS -6V 6.8F 0.1F
RG 150 0.1F
FIGURE 1. DC-Coupled, G = +4, Bipolar Supply, Specification and Test Circuit.
FIGURE 2. AC-Coupled, G = +4, Single Supply Specification and Test Circuit.
(R)
OPA2677
12
IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI's standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer's applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI's publication of information regarding any third party's products or services does not constitute TI's approval, warranty or endorsement thereof.
Copyright (c) 2000, Texas Instruments Incorporated

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