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LT1206

1206fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

250mA/60MHz Current

Feedback Ampliﬁ er

The LT

1206 is a current feedback ampliﬁ er with high

output current drive capability and excellent video char-

acteristics. The LT1206 is stable with large capacitive

loads, and can easily supply the large currents required

by the capacitive loading. A shutdown feature switches

the device into a high impedance, low current mode,

reducing dissipation when the device is not in use. For

lower bandwidth applications, the supply current can be

reduced with a single external resistor. The low differential

gain and phase, wide bandwidth, and the 250mA mini-

mum output current drive make the LT1206 well suited

to drive multiple cables in video systems.

The LT1206 is manufactured on Linear Technology’s

proprietary complementary bipolar process.

Noninverting Ampliﬁ er with Shutdown

■

Video Ampliﬁ ers

■

Cable Drivers

■

RGB Ampliﬁ ers

■

Test Equipment Ampliﬁ ers

■

Buffers

■

250mA Minimum Output Drive Current

■

60MHz Bandwidth, A

= 2, R

= 100Ω

■

900V/µs Slew Rate, A

= 2, R

= 50Ω

■

0.02% Differential Gain, A

= 2, R

= 30Ω

■

0.17° Differential Phase, A

= 2, R

= 30Ω

■

High Input Impedance, 10MΩ

■

Wide Supply Range, ±5V to ±15V

■

Shutdown Mode: I

< 200µA

■

Adjustable Supply Current

■

Stable with C

= 10,000p

■

Available in 8-Pin DIP and SO and 7-Pin DD and

TO-220 Packages

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

All other trademarks are the property of their respective owners.

–

LT1206

S/D**

15V

–15V

COMP

0.01µF*

24k

15V

ENABLE

OUT

OPTIONAL, USE WITH CAPACITIVE LOADS

GROUND SHUTDOWN PIN FOR

NORMAL OPERATION

LT1206 • TA01

COMP

74C906

= ±15V

= R

= 3k

= ∞

500ns/DIV

1206 TA02

Large-Signal Response, CL = 10,000pF

Summary of content (16 pages)

PAGE 1
LT1206 250mA/60MHz Current Feedback Amplifier FEATURES DESCRIPTION ■ The LT®1206 is a current feedback ampliﬁer with high output current drive capability and excellent video characteristics. The LT1206 is stable with large capacitive loads, and can easily supply the large currents required by the capacitive loading. A shutdown feature switches the device into a high impedance, low current mode, reducing dissipation when the device is not in use.
PAGE 2
LT1206 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltage ........................................................±18V Input Current........................................................±15mA Output Short-Circuit Duration (Note 2) .........Continuous Speciﬁed Temperature Range (Note 3) ........ 0°C to 70°C Operating Temperature Range ................. –40°C to 85°C Junction Temperature ........................................... 150°C Storage Temperature Range...................
PAGE 3
LT1206 ELECTRICAL CHARACTERISTICS The ● denotes the speciﬁcations which apply over the full operating temperature range, otherwise speciﬁcations are at TA = 25°C. VCM = 0, ±5V ≤ VS ≤ 15V, pulse tested, VS/D = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS en Input Noise Voltage Density f = 10kHz, RF = 1k, RG = 10Ω, RS = 0Ω 3.
PAGE 4
LT1206 SMALL-SIGNAL BANDWIDTH IS = 20mA Typical, Peaking ≤ 0.1dB AV RL RF RG –3dB BW (MHz) –0.1dB BW (MHz) VS = ±5V, RS/D = 0Ω AV RL RF RG –3dB BW (MHz) –0.1dB BW (MHz) VS = ±15V, RS/D = 0Ω –1 150 30 10 562 649 732 562 649 732 48 34 22 21.4 17 12.5 –1 150 30 10 681 768 887 681 768 887 50 35 24 19.2 17 12.3 1 150 30 10 619 715 806 – – – 54 36 22.4 22.3 17.5 11.5 1 150 30 10 768 909 1k – – – 66 37 23 22.4 17.5 12 2 150 30 10 576 649 750 576 649 750 48 35 22.4 20.
PAGE 5
LT1206 TYPICAL PERFORMANCE CHARACTERISTICS 100 RF = 560Ω 60 RF = 680Ω 50 40 RF = 750Ω 30 RF = 1k 20 10 40 FEEDBACK RESISTOR (Ω) –3dB BANDWIDTH (MHz) RF = 470Ω RF = 560Ω 30 RF = 750Ω 20 RF = 1k RF = 2k 10 1k FEEDBACK RESISTOR AV = 2 RL = ∞ VS = ±15V CCOMP = 0.01µF 10 RF = 1.
PAGE 6
LT1206 TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Ambient Temperature, VS = ±5V Supply Current vs Supply Voltage 24 25 25 TJ = –40˚C 22 RSD = 0Ω SUPPLY CURRENT (mA) 20 20 TJ = 25˚C 18 16 TJ = 85˚C 14 TJ = 125˚C AV = 1 RL = ∞ N PACKAGE 15 RSD = 10.2k 10 RSD = 22.1k 5 AV = 1 RL = ∞ N PACKAGE RSD = 0Ω 20 SUPPLY CURRENT (mA) VS/D = 0V SUPPLY CURRENT (mA) Supply Current vs Ambient Temperature, VS = ±15V 15 RSD = 60.
PAGE 7
LT1206 TYPICAL PERFORMANCE CHARACTERISTICS Output Impedance in Shutdown vs Frequency Output Impedance vs Frequency –30 100k VS = ±15V IO = 0mA AV = 1 RF = 1k VS = ±15V RS/D = 0Ω 1 0.
PAGE 8
LT1206 SIMPLIFIED SCHEMATIC V+ TO ALL CURRENT SOURCES Q5 Q10 Q2 Q18 Q17 D1 Q6 Q1 Q11 Q15 Q9 V– 1.25k +IN CC –IN V– 50Ω COMP RC OUTPUT V+ SHUTDOWN V+ Q12 Q3 Q8 Q16 Q14 D2 Q4 Q13 Q7 V– LT1206 • SS APPLICATIONS INFORMATION The LT1206 is a current feedback ampliﬁer with high output current drive capability. The device is stable with large capacitive loads and can easily supply the high currents required by capacitive loads.
PAGE 9
LT1206 APPLICATIONS INFORMATION 12 VS = ±15V 10 RF = 1.2k COMPENSATION VOLTAGE GAIN (dB) 8 6 4 RF = 2k NO COMPENSATION 2 0 RF = 2k COMPENSATION –2 –4 –6 –8 1 10 FREQUENCY (MHz) 100 LT1206 • F01 Figure 1 is ﬂat to 0.35dB to 30MHz. The network has the greatest effect for CL in the range of 0pF to 1000pF. The graph of Maximum Capacitive Load vs Feedback Resistor can be used to select the appropriate value of feedback resistor. The values shown are for 0.
PAGE 10
LT1206 APPLICATIONS INFORMATION For applications where the full bandwidth of the ampliﬁer is not required, the quiescent current of the device may be reduced by connecting a resistor from the shutdown pin to ground. The quiescent current will be approximately 40 times the current in the shutdown pin. The voltage across the resistor in this condition is V + – 3VBE. For example, a 60k resistor will set the quiescent supply current to 10mA with VS = ±15V.
PAGE 11
LT1206 APPLICATIONS INFORMATION the maximum allowable input voltage. To allow for some margin, it is recommended that the input signal be less than ±5V when the device is shut down. Capacitance on the Inverting Input RF = 750Ω RL = 50Ω 20ns/DIV 1206 F05c Figure 5c. Large-Signal Response, AV = 2 When the LT1206 is used to drive capacitive loads, the available output current can limit the overall slew rate. In the fastest conﬁguration, the LT1206 is capable of a slew rate of over 1V/ns.
PAGE 12
LT1206 APPLICATIONS INFORMATION power plane layer either inside or on the opposite side of the board. Although the actual thermal resistance of the PCB material is high, the length/area ratio of the thermal resistance between the layer is small. Copper board stiffeners and plated through holes can also be used to spread the heat generated by the device. Tables 1 and 2 list thermal resistance for each package.
PAGE 13
LT1206 TYPICAL APPLICATIONS Precision ×10 Hi Current Ampliﬁer CMOS Logic to Shutdown Interface 15V + + LT1097 LT1206 COMP – S/D – + OUT 330Ω 24k LT1206 S/D 0.01µF – 500pF LT1206 • TA05 3k 5V –15V 10k 2N3904 10k LT1206 • TA03 OUTPUT OFFSET: < 500µV SLEW RATE: 2V/µs BANDWIDTH: 4MHz STABLE WITH CL < 10nF 1k Low Noise ×10 Buffered Line Driver 15V 1µF + + 75Ω + 1µF – + VIN + LT1115 – Distribution Ampliﬁer 15V 1µF + – OUTPUT LT1206 S/D 75Ω CABLE 75Ω RF 75Ω 0.
PAGE 14
LT1206 PACKAGE DESCRIPTION N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .300 – .325 (7.620 – 8.255) ( +0.889 8.255 –0.381 .130 ± .005 (3.302 ± 0.127) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .008 – .015 (0.203 – 0.381) +.035 .325 –.015 .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) ) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) .100 (2.54) BSC N8 1002 NOTE: 1.
PAGE 15
LT1206 PACKAGE DESCRIPTION S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 7 8 .245 MIN 6 5 .160 ±.005 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 3 2 4 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) .050 (1.
PAGE 16
LT1206 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1010 High Speed Buffer High Power, High Speed Buffer LT1207 Dual 250mA Out, 900V/µs, 60MHz Current Feedback Ampliﬁer Adjustable Supply Current, Shutdown LT1210 1.1A, 35MHz, 900V/µs Current Feedback Ampliﬁer Adjustable Supply Current, Shutdown LT1395 Single 400MHz Current Feedback Ampliﬁer 0.1dB Gain Flatness to 100MHz LT1815 6.5mA, 220MHz, 1.