Datasheet

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LT1223

1223fb

TYPICAL APPLICATIO

APPLICATIO S

DESCRIPTIO

FEATURES

100MHz Current

Feedback Amplifier

■

100MHz Bandwidth at A

= 1

■

1000V/µs Slew Rate

■

Wide Supply Range: ±5V to ±15V

■

1mV Input Offset Voltage

■

1µA Input Bias Current

■

5MΩ Input Resistance

■

75ns Settling Time to 0.1%

■

50mA Output Current

■

6mA Quiescent Current

■

Available in 8-Lead Plastic DIP and SO Packages

■

Video Amplifiers

■

Buffers

■

IF and RF Amplification

■

Cable Drivers

■

8-, 10-, 12-Bit Data Acquisition Systems

The LT

1223 is a 100MHz current feedback amplifier with

very good DC characteristics. The LT1223’s high slew

rate, 1000V/µs, wide supply range, ±15V, and large output

drive, ±50mA, make it ideal for driving analog signals over

double-terminated cables. The current feedback amplifier

has high gain bandwidth at high gains, unlike conventional

op amps.

The LT1223 comes in the industry standard pinout and

can upgrade the performance of many older products.

The LT1223 is manufactured on Linear Technology’s

proprietary complementary bipolar process.

Video Cable Driver Voltage Gain vs Frequency

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

All other trademarks are the property of their respective owners.

Ω

OUT

CABLE

Ω

–

LT1223

LT1223 • TA02

A = 1 +

AT AMPLIFIER OUTPUT

6dB LESS AT V

OUT

FREQUENCY (Hz)

100k

–20

VOLTAGE GAIN (dB)

–10

10M 100M 1G

LT1223 • TPC01

100MHz GAIN

BANDWIDTH

= 10

= 33

= 110

= 470

= ∞

–

Summary of content (16 pages)

PAGE 1
LT1223 100MHz Current Feedback Amplifier U FEATURES DESCRIPTIO ■ The LT®1223 is a 100MHz current feedback amplifier with very good DC characteristics. The LT1223’s high slew rate, 1000V/µs, wide supply range, ±15V, and large output drive, ±50mA, make it ideal for driving analog signals over double-terminated cables. The current feedback amplifier has high gain bandwidth at high gains, unlike conventional op amps.
PAGE 2
LT1223 W U U W W W AXI U RATI GS U ABSOLUTE PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART NUMBER TOP VIEW Supply Voltage ...................................................... ±18V Differential Input Voltage ......................................... ±5V Input Voltage ............................ Equal to Supply Voltage Output Short Circuit Duration (Note 2) ......... Continuous Operating Temperature Range LT1223M (OBSOLETE) .............. –55°C to 125°C LT1223C ..................................
PAGE 3
LT1223 ELECTRICAL CHARACTERISTICS VS = ± 15V, TA = 25°C, unless otherwise noted. PARAMETER CONDITIONS tr Rise Time RF = 1.5k, RG = 1.5k, VOUT = 1V 6.0 ns tPD Propagation Delay RF = 1.5k, RG = 1.5k, VOUT = 1V 6.0 ns Overshoot RF = 1.5k, RG = 1.5k, VOUT = 1V 5 % Settling Time, 0.1% RF = 1k, RG = 1k, VOUT = 10V 75 ns Differential Gain RF = 1k, RG = 1k, RL = 150Ω 0.02 % Differential Phase RF = 1k, RG = 1k, RL = 150Ω 0.
PAGE 4
LT1223 ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at VS = ± 15V, VCM = 0V, – 55°C ≤ TA ≤ 125°C, unless otherwise noted.
PAGE 5
LT1223 U W TYPICAL PERFOR A CE CHARACTERISTICS Supply Current vs Supply Voltage (Shutdown) 4 10 100 PIN 8 = 0V 125°C SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 8 25°C 6 –55°C 4 3 25°C 125°C 2 –55°C 1 2 2 4 6 8 0 10 12 14 16 18 20 2 4 SUPPLY VOLTAGE (±V) 6 8 70 60 50 40 30 20 10 5 –1 4 V S = 15V IB (µA) 3 1 V– –50 VS = ±5V 0 25 50 75 100 –55°C 0 125°C –1 –2 –3 –6 –10 –5 0 5 OUTPUT VOLTAGE SWING (V) 10 5 125°C 0 25°C –55°C 5 10 15 COMMON MODE VOLTAGE (V) LT122
PAGE 6
LT1223 U W TYPICAL PERFOR A CE CHARACTERISTICS 80 70 60 50 40 30 80 70 40 RF = 1.
PAGE 7
LT1223 U W TYPICAL PERFOR A CE CHARACTERISTICS 225 VS = ±15V 180 RF = RG = 1k 10 135 GAIN 5 RL = 100Ω 90 RL ≥ 1k 0 45 PHASE –5 –10 RL = 100Ω 0 RL ≥ 1k –45 0.1 TOTAL HARMONIC DISTORTION (%) 15 PHASE SHIFT (DEGREES) VOLTAGE GAIN (dB) 20 Total Harmonic Distortion vs Frequency –15 –90 –20 –135 –25 –180 –225 –30 1M 10M 100M –20 VS = ±15V VO = 7VRMS RL = 400 Ω RF = RG =1k 0.01 THD 0.
PAGE 8
LT1223 U W U U APPLICATIO S I FOR ATIO The curve on the first page shows the LT1223 voltage gain versus frequency while driving 100Ω, for five gain settings from 1 to 100. The feedback resistor is a constant 1k and the gain resistor is varied from infinity to 10Ω. Shown for comparison is a plot of the fixed 100MHz gain bandwidth limitation that a voltage feedback amplifier would have. It is obvious that for gains greater than one, the LT1223 provides 3 to 20 times more bandwidth.
PAGE 9
LT1223 U W U U APPLICATIO S I FOR ATIO Shutdown Output Slew Rate of 500V/µs Pin 8 activates a shutdown control function. Pulling more than 200mA from Pin 8 drops the supply current to less than 3mA, and puts the output into a high impedance state. The easy way to force shutdown is to ground Pin 8, using an open collector (drain) logic stage. An internal resistor limits current, allowing direct interfacing with no additional parts. When Pin 8 is open, the LT1223 operates normally.
PAGE 10
LT1223 U U W U APPLICATIO S I FOR ATIO have about 2.5mV thermal tail on a 10V step. Unfortunately, reducing the input signal and increasing the gain always results in a thermal tail of about the same amount for a given output step. For this reason we show separate graphs of 10mV and 1mV non-inverting amplifier settling times. Just as the bandwidth of the LT1223 is fairly constant for various closed-loop gains, the settling time remains constant as well.
PAGE 11
LT1223 U U W U APPLICATIO S I FOR ATIO Summing Amplifier (DC Accurate) The summing amplifier is easily made by adding additional inputs to the basic inverting amplifier configuration. The LT1223 has no IOS spec because there is no correlation between the two input bias currents. Therefore, we will not improve the DC accuracy of the inverting amplifier by putting in the extra resistor in the noninverting input.
PAGE 12
LT1223 U TYPICAL APPLICATIO 150mA Output Current Video Amp V+ V+ LT1223 75Ω 75Ω 75Ω 75Ω 75Ω 75Ω 75Ω 75Ω 75Ω 20 Ω + V IN 75Ω IN LT1010 BIAS OUT – V– V– 2k 2k R f = 2k TO STABILIZE CIRCUIT DIFFERENTIAL GAIN = 1% DIFFERENTIAL PHASE = 1° LT1223 • TA10 W W SI PLIFIED SCHE ATIC 7 15k 1 5 BIAS 10k 8 3 2 6 BIAS 4 LT1223 • TA01 1223fb 12
PAGE 13
LT1223 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) .023 – .045 (0.584 – 1.143) HALF LEAD OPTION .045 – .068 (1.143 – 1.650) FULL LEAD OPTION .005 (0.127) MIN .405 (10.287) MAX 8 7 6 5 .025 (0.635) RAD TYP .220 – .310 (5.588 – 7.874) 1 .300 BSC (7.62 BSC) 2 3 4 .200 (5.080) MAX .015 – .060 (0.381 – 1.524) .008 – .018 (0.203 – 0.
PAGE 14
LT1223 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .045 – .065 (1.143 – 1.651) .130 ± .005 (3.302 ± 0.127) .065 (1.651) TYP .100 (2.54) BSC .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 15
LT1223 U PACKAGE DESCRIPTIO 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 8 .245 MIN 7 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) .008 – .010 (0.203 – 0.254) 3 4 .053 – .069 (1.346 – 1.752) .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) NOTE: 1.
PAGE 16
LT1223 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1206 250mA/60MHz Current Feedback Amplifier 900V/µs, Shutdown LT1395 400MHz Current Feedback Amplifier 800V/µs, 4.6mA Supply Current, SOT-23 Package LT1497 Dual 125mA, 50MHz Current Feedback Amplifier 900V/µs, 7mA Supply Current LT6210/LT6211 Single/Dual Programmable Supply Current, Rail-to-Rail Output C-LoadTM Stable, 200MHz, 700V/µs C-Load is a trademark of Linear Technology Corporation.