Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsLinear ICsLinear IC - Op-amp Current feedback PDIP 8

LM6181

www.ti.com

SNOS634B –MAY 1998–REVISED MAY 2013

LM6181 100 mA, 100 MHz Current Feedback Amplifier

Check for Samples: LM6181

FEATURES

DESCRIPTION

The LM6181 current-feedback amplifier offers an

• (Typical Unless Otherwise Noted)

unparalleled combination of bandwidth, slew-rate,

• Slew Rate: 2000 V/μs

and output current. The amplifier can directly drive up

• Settling Time (0.1%): 50 ns

to 100 pF capacitive loads without oscillating and a

10V signal into a 50Ω or 75Ω back-terminated coax

• Characterized for Supply Ranges: ±5V and

cable system over the full industrial temperature

±15V

range. This represents a radical enhancement in

• Low Differential Gain and Phase Error: 0.05%,

output drive capability for an 8-pin PDIP high-speed

0.04°

amplifier making it ideal for video applications.

• High Output Drive: ±10V into 100Ω

Built on TI's advanced high-speed VIP™ II (Vertically

• Ensured Bandwidth and Slew Rate

Integrated PNP) process, the LM6181 employs

current-feedback providing bandwidth that does not

• Improved Performance Over EL2020, OP160,

vary dramatically with gain; 100 MHz at A

= −1,

AD844, LT1223 and HA5004

60 MHz at A

= −10. With a slew rate of 2000V/μs,

2nd harmonic distortion of −50 dBc at 10 MHz and

APPLICATIONS

settling time of 50 ns (0.1%) the LM6181 dynamic

• Coax Cable Driver

performance makes it ideal for data acquisition, high

speed ATE, and precision pulse amplifier

• Video Amplifier

applications.

• Flash ADC Buffer

• High Frequency Filter

• Scanner and Imaging Systems

Typical Application

Figure 1. Cable Driver

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.

2VIP is a trademark of Texas Instruments.

3All other trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (40 pages)

PAGE 1
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 LM6181 100 mA, 100 MHz Current Feedback Amplifier Check for Samples: LM6181 FEATURES DESCRIPTION • • • • The LM6181 current-feedback amplifier offers an unparalleled combination of bandwidth, slew-rate, and output current. The amplifier can directly drive up to 100 pF capacitive loads without oscillating and a 10V signal into a 50Ω or 75Ω back-terminated coax cable system over the full industrial temperature range.
PAGE 2
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
PAGE 3
LM6181 www.ti.
PAGE 4
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com ±15V DC Electrical Characteristics The following specifications apply for Supply Voltage = ±15V, RF = 820Ω, and RL = 1 kΩ unless otherwise noted. Boldface limits apply at the temperature extremes; all other limits TJ = 25°C. Symbol Parameter Conditions LM6181AM LM6181AI LM6181I Units Typical (1) Limit (2) Typical (1) Limit (2) Typical (1) Limit (2) 3.0 4.0 2.0 3.0 3.5 3.5 5.0 5.5 VOS Input Offset Voltage 2.
PAGE 5
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 ±15V AC Electrical Characteristics The following specifications apply for Supply Voltage = ±15V, RF = 820Ω, RL = 1 kΩ unless otherwise noted. Boldface limits apply at the temperature extremes; all other limits TJ = 25°C.
PAGE 6
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com ±5V DC Electrical Characteristics The following specifications apply for Supply Voltage = ±5V, RF = 820Ω, and RL = 1 kΩ unless otherwise noted. Boldface limits apply at the temperature extremes; all other limits TJ = 25°C. Symbol Parameter Conditions LM6181AM LM6181AI LM6181I Units Typical (1) Limit (2) Typical (1) Limit (2) Typical (1) Limit (2) 2.0 3.0 1.0 2.0 2.5 1.0 3.0 3.5 VOS Input Offset Voltage 1.
PAGE 7
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 ±5V AC Electrical Characteristics The following specifications apply for Supply Voltage = ±5V, RF = 820Ω, and RL = 1 kΩ unless otherwise noted. Boldface limits apply at the temperature extremes; all other limits TJ = 25°C.
PAGE 8
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics TA = 25°C unless otherwise noted 8 CLOSED-LOOP FREQUENCY RESPONSE VS = ±15V; Rf = 820Ω; RL = 1 kΩ CLOSED-LOOP FREQUENCY RESPONSE VS = ±15V; Rf = 820Ω; RL = 150Ω Figure 2. Figure 3. UNITY GAIN FREQUENCY RESPONSE VS = ±15V; AV = +1; Rf = 820Ω UNIT GAIN FREQUENCY RESPONSE VS = ±5V; AV = +1; Rf = 820Ω Figure 4. Figure 5.
PAGE 9
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted INVERTING GAIN FREQUENCY RESPONSE VS = ±15V; AV = −1; Rf = 820Ω INVERTING GAIN FREQUENCY RESPONSE VS = ±5V; AV = −1; Rf = 820Ω Figure 8. Figure 9. NON-INVERTING GAIN FREQUENCY RESPONSE VS = ±15V; AV = +2; Rf = 820Ω NON-INVERTING GAIN FREQUENCY RESPONSE VS = ±5V; AV = +2; Rf = 820Ω Figure 10. Figure 11.
PAGE 10
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted 10 NON-INVERTING GAIN FREQUENCY RESPONSE VS = ±15V; AV = +10; Rf = 820Ω NON-INVERTING GAIN FREQUENCY RESPONSE VS = ±5V; AV = +10; Rf = 820Ω Figure 14. Figure 15. NON-INVERTING GAIN FREQUENCY COMPENSATION VS = ±15V; AV = +2; RL = 150Ω BANDWIDTH vs Rf & RS AV = −1, RL = 1 kΩ Figure 16. Figure 17.
PAGE 11
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted TRANSIMPEDANCE vs FREQUENCY VS = ±15V RL = 100Ω TRANSIMPEDANCE vs FREQUENCY VS = ±5V RL = 1 kΩ Figure 20. Figure 21. SETTLING RESPONSE VS = ±15V; RL = 150Ω; VO = ±5V; AV = −1 SETTLING RESPONSE VS = ±5V; RL = 150Ω; VO = ±2V; AV = −1 Figure 22. Figure 23. SUGGESTED Rf and RS for CL AV = − 1; RL = 150Ω TRANSIMPEDANCE vs FREQUENCY VS = ±5V RL = 100Ω Figure 24.
PAGE 12
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted 12 SUGGESTED Rf and RS FOR CL AV = −1 SUGGESTED Rf and RS FOR CL AV = +2; RL = 150Ω Figure 26. Figure 27. SUGGESTED Rf and RS FOR CL AV = +2 OUTPUT IMPEDANCE vs FREQ VS = ±15V; AV = −1 Rf = 820Ω Figure 28. Figure 29. OUTPUT IMPEDANCE vs FREQ VS = ±5V; AV = −1 Rf = 820Ω PSRR (VS+) vs FREQUENCY Figure 30. Figure 31.
PAGE 13
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted PSRR (VS−) vs FREQUENCY CMRR vs FREQUENCY Figure 32. Figure 33. INPUT VOLTAGE NOISE vs FREQUENCY INPUT CURRENT NOISE vs FREQUENCY Figure 34. Figure 35. SLEW RATE vs TEMPERATURE AV = −1; RL = 150Ω, VS = ±15V SLEW RATE vs TEMPERATURE AV = −1; RL = 150Ω, VS = ±5V Figure 36. Figure 37.
PAGE 14
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted 14 −3 dB BANDWIDTH vs TEMPERATURE AV = −1 SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +1 VS = ±15V; RL = 1 kΩ Figure 38. Figure 39. SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +1 VS = ±15V; RL = 100Ω SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +1 VS = ±5V; RL = 1 kΩ Figure 40. Figure 41.
PAGE 15
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = −1 VS = ±15V; RL = 100Ω SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = −1 VS = ±5V; RL = 1 kΩ Figure 44. Figure 45. SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = −1 VS = ±5V; RL = 100Ω SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +2 VS = ±15V; RL = 1 kΩ Figure 46. Figure 47.
PAGE 16
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted 16 SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +2 VS = ±5V; RL = 100Ω SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = −10 VS = ±15V; RL = 1 kΩ Figure 50. Figure 51. SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = −10 VS = ±15V; RL = 100Ω SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = −10 VS = ±5V; RL = 1 kΩ Figure 52. Figure 53.
PAGE 17
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +10 VS = ±15V; RL = 100Ω SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +10 VS = ±5V; RL = 1 kΩ Figure 56. Figure 57. SMALL SIGNAL PULSE RESPONSE vs TEMP, AV = +10 VS = ±5V; RL = 100Ω OFFSET VOLTAGE vs TEMPERATURE Figure 58. Figure 59. OFFSET VOLTAGE vs TEMPERATURE TRANSIMPEDANCE vs TEMPERATURE Figure 60. Figure 61.
PAGE 18
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted 18 TRANSIMPEDANCE vs TEMPERATURE QUIESCENT CURRENT vs TEMPERATURE Figure 62. Figure 63. PSRR vs TEMPERATURE CMRR vs TEMPERATURE Figure 64. Figure 65. NON-INVERTING BIAS CURRENT vs TEMPERATURE INVERTING BIAS CURRENT vs TEMPERATURE Figure 66. Figure 67.
PAGE 19
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted PSR IB(+) vs TEMPERATURE PSR IB(−) vs TEMPERATURE Figure 68. Figure 69. CMR IB(+) vs TEMPERATURE CMR IB(−) vs TEMPERATURE Figure 70. Figure 71. ISC(+) vs TEMPERATURE ISC(−) vs TEMPERATURE Figure . Figure 72.
PAGE 20
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Typical Performance Characteristics (continued) TA = 25°C unless otherwise noted Absolute Maximum Power Derating Curves Figure 73. N-Package *θJA = Thermal Resistance with 2 square inches of 1 ounce Copper tied to Pins 1, 8, 9 and 16. Figure 74. M-Package Figure 75.
PAGE 21
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Simplified Schematic Figure 76.
PAGE 22
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com TYPICAL APPLICATIONS CURRENT FEEDBACK TOPOLOGY For a conventional voltage feedback amplifier the resulting small-signal bandwidth is inversely proportional to the desired gain to a first order approximation based on the gain-bandwidth concept. In contrast, the current feedback amplifier topology, such as the LM6181, transcends this limitation to offer a signal bandwidth that is relatively independent of the closed-loop gain.
PAGE 23
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Variation of Closed Loop Gain from −1 to −5 Yields Similar Responses Figure 78. The closed-loop bandwidth of the LM6181 depends on the feedback resistance, Rf. Therefore, RS and not Rf, must be varied to adjust for the desired closed-loop gain as in Figure 79. Figure 79.
PAGE 24
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Rf while maintaining the same closed-loop gain—the amplifier bandwidth decreases. Accordingly, larger feedback resistors can be used to slow down the LM6181 (see −3 dB bandwidth vs Rftypical curves) and reduce overshoot in the time domain response. Conversely, smaller feedback resistance values than 820Ω can be used to compensate for the reduction of bandwidth at high closed loop gains, due to 2nd order effects.
PAGE 25
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Increasing Compensation with Increasing Rf Figure 81. Rf = 1640Ω Figure 82.
PAGE 26
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com SLEW RATE CONSIDERATIONS The slew rate characteristics of current feedback amplifiers are different than traditional voltage feedback amplifiers. In voltage feedback amplifiers slew rate limiting or non-linear amplifier behavior is dominated by the finite availability of the 1st stage tail current charging the compensation capacitor. The slew rate of current feedback amplifiers, in contrast, is not constant.
PAGE 27
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Figure 85. Rf and RS Could Be Increased to Maintain AV = −1 and Improve Pulse Response Characteristics. Figure 86. Resistive Isolation of CL Provides Higher Fidelity Pulse Response. CAPACITIVE FEEDBACK For voltage feedback amplifiers it is quite common to place a small lead compensation capacitor in parallel with feedback resistance, Rf.
PAGE 28
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Figure 87. (1) Figure 88.
PAGE 29
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Typical Performance Characteristics OVERDRIVE RECOVERY When the output or input voltage range of a high speed amplifier is exceeded, the amplifier must recover from an overdrive condition. The typical recovery times for open-loop, closed-loop, and input common-mode voltage range overdrive conditions are illustrated in Figure 90, Figure 92, and Figure 93, respectively.
PAGE 30
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com Figure 91. Figure 92. Closed-Loop Overdrive Recovery Time of 30 ns from Exceeding Output Voltage Range from Circuit in Figure 91 The common-mode input of the circuit in Figure 91 is exceeded by a 5V pulse resulting in a typical recovery time of 310 ns shown in Figure 93. The LM6181 supply voltage is ±5V.
PAGE 31
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 Figure 93. Exceptional Output Recovery from an Input that Exceeds the Common-Mode Range Connection Diagrams Figure 94.
PAGE 32
LM6181 SNOS634B – MAY 1998 – REVISED MAY 2013 www.ti.com *Heat sinking pins (1) Figure 95. 16-Pin SOIC Package (M) See Package Number D (1) 32 The typical junction-to-ambient thermal resistance of the molded PDIP(N) package soldered directly into a PC board is 102°C/W. The junction-to-ambient thermal resistance of the SOIC (M) package mounted flush to the PC board is 70°C/W when pins 1, 4, 8, 9 and 16 are soldered to a total 2 in2 1 oz. copper trace.
PAGE 33
LM6181 www.ti.com SNOS634B – MAY 1998 – REVISED MAY 2013 REVISION HISTORY Changes from Revision A (May 2013) to Revision B • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
PAGE 34
PACKAGE OPTION ADDENDUM www.ti.
PAGE 35
PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 36
PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LM6181IMX-8/NOPB Package Package Pins Type Drawing SOIC D 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.5 B0 (mm) K0 (mm) P1 (mm) 5.4 2.0 8.0 W Pin1 (mm) Quadrant 12.
PAGE 37
PACKAGE MATERIALS INFORMATION www.ti.com 8-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM6181IMX-8/NOPB SOIC D 8 2500 367.0 367.0 35.
PAGE 38
PAGE 39
PAGE 40
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.