Datasheet

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LT1221

TYPICAL APPLICATIO

DESCRIPTIO

APPLICATIO S

FEATURES

150MHz, 250V/µs, A

≥ 4

Operational Amplifier

■

Gain-Bandwidth: 150MHz

■

Gain of 4 Stable

■

Slew Rate: 250V/µs

■

Input Noise Voltage: 6nV/√Hz

■

C-Load

Op Amp Drives Capacitive Loads

■

Maximum Input Offset Voltage: 600µV

■

Maximum Input Bias Current: 300nA

■

Maximum Input Offset Current: 300nA

■

Minimum Output Swing Into 500Ω: ±12V

■

Minimum DC Gain: 50V/mV, R

= 500Ω

■

Settling Time to 0.1%: 65ns, 10V Step

■

Settling Time to 0.01%: 85ns, 10V Step

■

Differential Gain: 0.08%, A

= 4, R

= 150Ω

■

Differential Phase: 0.2°, A

= 4, R

= 150Ω

The LT

1221 is a very high speed operational amplifier

with superior DC performance. The LT1221 is stable in a

noise gain of 4 or greater. It features reduced input offset

voltage, lower input bias currents and higher DC gain than

devices with comparable bandwidth and slew rate. The

circuit is a single gain stage that includes proprietary DC

gain enhancement circuitry to obtain precision with high

speed. The high gain and fast settling time make the circuit

an ideal choice for data acquisition systems. The circuit is

also capable of driving capacitive loads which makes it

useful in buffer or cable driver applications.

The LT1221 is a member of a family of fast, high perfor-

mance amplifiers that employ Linear Technology

Corporation’s advanced complementary bipolar process-

ing. For unity-gain stable applications the LT1220 can be

used, and for gains of 10 or greater the LT1222 can be used.

Summing Amplifier

Summing Amplifier Large-Signal Response

LT1221 • TA02

= ±15V

= 10V

P-P

f = 2MHz

■

Wideband Amplifiers

■

Buffers

■

Active Filters

■

Video and RF Amplification

■

Cable Drivers

■

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

LT1221 • TA01

–

LT1221

OUT

, LTC and LT are registered trademarks of Linear Technology Corporation

C-Load is a trademark of Linear Technology Corporation

Summary of content (12 pages)

PAGE 1
LT1221 150MHz, 250V/µs, AV ≥ 4 Operational Amplifier U DESCRIPTIO FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ Gain-Bandwidth: 150MHz Gain of 4 Stable Slew Rate: 250V/µs Input Noise Voltage: 6nV/√Hz C-LoadTM Op Amp Drives Capacitive Loads Maximum Input Offset Voltage: 600µV Maximum Input Bias Current: 300nA Maximum Input Offset Current: 300nA Minimum Output Swing Into 500Ω: ±12V Minimum DC Gain: 50V/mV, RL = 500Ω Settling Time to 0.1%: 65ns, 10V Step Settling Time to 0.01%: 85ns, 10V Step Differential Gain: 0.
PAGE 2
LT1221 W W W AXI U Total Supply Voltage (V + to U ABSOLUTE RATI GS (Note 1) V –) ............................. 36V Differential Input Voltage ........................................ ±6V Input Voltage .......................................................... ±VS Output Short-Circuit Duration (Note 2) ........... Indefinite Specified Temperature Range LT1221C (Note 3) ................................... 0°C to 70°C LT1221M (OBSOLETE) ...............
PAGE 3
LT1221 ELECTRICAL CHARACTERISTICS SYMBOL tr, tf ts PARAMETER Rise Time, Fall Time Overshoot Propagation Delay Settling Time Differential Gain Differential Phase RO IS Output Resistance Supply Current VS = ±15V, TA = 25°C, VCM = 0V, unless otherwise specified. CONDITIONS AV = 4, 10% to 90%, 0.1V AV = 4, 0.1V AV = 4, 50% VIN to 50% VOUT, 0.1V 10V Step, 0.1% 10V Step, 0.01% f = 3.58MHz, RL = 150Ω (Note 7) f = 3.58MHz, RL = 1k (Note 7) f = 3.58MHz, RL = 150Ω (Note 7) f = 3.
PAGE 4
LT1221 U W TYPICAL PERFORMANCE CHARACTERISTICS Input Common Mode Range vs Supply Voltage Supply Current vs Supply Voltage and Temperature MAGNITUDE OF OUTPUT VOLATGE (V) TA = 25°C ∆VOS = 0.
PAGE 5
LT1221 U W TYPICAL PERFORMANCE CHARACTERISTICS Common Mode Rejection Ratio vs Frequency Output Swing and Error vs Settling Time (Noninverting) 10 VS = ±15V TA = 25°C 6 60 40 6 10mV 4 2 0 –2 –4 10mV –6 20 0 1k 10k 1M 100k FREQUENCY (Hz) 10M 1mV OUTPUT SWING (V) 80 1mV 75 100 50 SETTLING TIME (ns) 100 VS = ±15V 40 20 20 0 0 VOLTAGE MAGNITUDE (dB) 20 10k 1M 100k FREQUENCY (Hz) 10M –20 100M VS = ±15V TA = 25°C AV = 4 C = 100pF 18 16 C = 50pF 14 12 10 1 0.01 0.
PAGE 6
LT1221 U W TYPICAL PERFORMANCE CHARACTERISTICS VS = ±15V VIN = 5VP-P LT1221 • TPC19 f = 5MHz f = 5MHz VS = ±15V VIN = 5VP-P LT1221 • TPC22 f = 2MHz VS = ±15V VIN = 5VP-P f = 20kHz LT1221 • TPC21 Small Signal, AV = – 4, CL = 1,000pF Large Signal, AV = – 4 Small Signal, AV = – 4 U W VS = ±15V VIN = 25mV LT1221 • TPC20 f = 2MHz LT1221 • TPC23 VS = ±15V VIN = 42mV f = 500kHz LT1221 • TPC24 U VS = ±15V VIN = 25mV Large Signal, AV = 4, CL = 10,000pF Large Signal, AV = 4 Small Signal, A
PAGE 7
LT1221 U U W U APPLICATIONS INFORMATION offset current have identical specifications. For this reason, matching the impedance on the inputs to reduce bias current errors is not necessary. Capacitive Loading The LT1221 is stable with capacitive loads. This is accomplished by sensing the load induced output pole and adding compensation at the amplifier gain node. As the capacitive load increases, both the bandwidth and phase margin decrease.
PAGE 8
LT1221 U PACKAGE DESCRIPTIO H Package 8-Lead TO-5 Metal Can (.200 Inch PCD) (Reference LTC DWG # 05-08-1320) 0.335 – 0.370 (8.509 – 9.398) DIA 0.305 – 0.335 (7.747 – 8.509) 0.040 (1.016) MAX 0.050 (1.270) MAX SEATING PLANE 0.165 – 0.185 (4.191 – 4.699) GAUGE PLANE 0.010 – 0.045* (0.254 – 1.143) REFERENCE PLANE 0.500 – 0.750 (12.700 – 19.050) 0.016 – 0.021** (0.406 – 0.533) 0.027 – 0.045 (0.686 – 1.143) 45°TYP 0.028 – 0.034 (0.711 – 0.864) PIN 1 0.200 (5.080) TYP 0.110 – 0.160 (2.794 – 4.
PAGE 9
LT1221 U PACKAGE DESCRIPTIO J8 Package 8-Lead CERDIP (Narrow .300 Inch, Hermetic) (Reference LTC DWG # 05-08-1110) CORNER LEADS OPTION (4 PLCS) 0.023 – 0.045 (0.584 – 1.143) HALF LEAD OPTION 0.045 – 0.068 (1.143 – 1.727) FULL LEAD OPTION 0.005 (0.127) MIN 0.405 (10.287) MAX 8 7 6 5 0.025 (0.635) RAD TYP 0.220 – 0.310 (5.588 – 7.874) 1 2 0.300 BSC (0.762 BSC) 3 4 0.200 (5.080) MAX 0.015 – 0.060 (0.381 – 1.524) 0.008 – 0.018 (0.203 – 0.
PAGE 10
LT1221 U PACKAGE DESCRIPTIO N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) 0.400* (10.160) MAX 8 7 6 5 1 2 3 4 0.255 ± 0.015* (6.477 ± 0.381) 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) ( +0.035 0.325 –0.015 8.255 +0.889 –0.381 ) 0.045 – 0.065 (1.143 – 1.651) 0.130 ± 0.005 (3.302 ± 0.127) 0.065 (1.651) TYP 0.100 (2.54) BSC 0.125 (3.175) 0.020 MIN (0.508) MIN 0.018 ± 0.003 (0.457 ± 0.
PAGE 11
LT1221 U PACKAGE DESCRIPTIO S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) 0.189 – 0.197* (4.801 – 5.004) 8 7 6 5 0.150 – 0.157** (3.810 – 3.988) 0.228 – 0.244 (5.791 – 6.197) SO8 1298 1 0.010 – 0.020 × 45° (0.254 – 0.508) 0.008 – 0.010 (0.203 – 0.254) 0.053 – 0.069 (1.346 – 1.752) 0°– 8° TYP 0.016 – 0.050 (0.406 – 1.270) 0.014 – 0.019 (0.355 – 0.483) TYP *DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.006" (0.
PAGE 12
LT1221 U TYPICAL APPLICATIO S Lag Compensation 20MHz, AV = 50 Instrumentation Amplifier + VIN + + VIN VOUT – LT1221 – LT1221 500Ω 10k 100pF – 2k 1k AV = 1, f < 3MHz 1k 200pF LT1221 1k 250Ω LT1221 • TA04 + 250Ω VOUT Cable Driver – 1k 10k LT1221 • TA03 – + VIN 75Ω 75Ω CABLE LT1221 LT1221 VOUT – + 75Ω 1.