KH231AK

www.cadeka.com KH231 Fast Settling, Wideband Buffer/Amplifier (Av = ±1 to ±5) Features s s s s s s General Description The KH231 Buffer/Amplifier is a wideband operational amplifier designed specifically for high-speed, lowgain applications. The KH231 is based on a current feedback op amp topology-a unique design that both eliminates the gain-bandwidth tradeoff and permits unprecedented high-speed performance. (See table below.) The KH231 Buffer/Amplifier is the ideal design alternative to low precision open-loop buffers and oscillationprone conventional op amps. The KH231 offers precise gains from ±1.000 to ±-5.000 and linearity that is a true 0.1%-even for demanding 50Ω loads. Open-loop buffers, on the other hand, offer a nominal gain of 0.95 ±0.03 and a linearity of only 3% for typical loads. A buffer’s settling time may look impressive but it is usually specified at unrealistically large load resistances or when the effects of thermal tail are not included; the KH231 Buffer/Amplifier settles to 0.05% in 15ns-while driving a 100Ω load. Offsets and drifts, usually a low priority in conventional high-speed op amp designs, were not ignored in the KH231; the input offset voltage is typically 1mV and input offset voltage drift is only 10µV/°C. The KH231 is stable and oscillation-free across the entire gain range and since it’s internally compensated, the user is saved the trouble of designing external compensation networks and having to “tweak” them in production. The absence of a gain-bandwidth tradeoff in the KH231 allows performance to be predicted easily; the table below shows how the bandwidth is affected very little by changing the gain setting. The KH231 is constructed using thin film resistor/bipolar transistor technology, and is available in the following versions: The KH231 is constructed using thin film resistor/bipolar transistor technology, and available in these versions: KH231AI KH231AK KH231AM -2 -5 Units MHz ns V/ns ns 165MHz closed-loop – -3dB bandwidth 15ns settling to 0.05% 1mV input offset voltage, 10µV/°C drift 100mA output current Excellent AC and DC linearity Direct replacement for CLC231 Applications s s s s Driving flash A/D converters Precision line driving (a gain of 2 cancels matched-line losses) DAC current-to-voltage conversion Low-power, high-speed applications (50mW @ ±5V) Small Signal Pulse Response Output Voltage (400mV/div) Av = 2 Av = -2 Time (5ns/div) Bottom View ICC Adjust Case ground GND 7 Adjust -VCC 8 9 -VCC V+ 6 10 K Supply Voltage Non-Inverting Input Inverting Input Not Connected Collector Supply Output + V- 5 NC 4 3 Case ground GND 2 4 4 - 11 Vo 12 +VCC Collector Supply 1 Supply Voltage Adjust +VCC ICC Adjust Pins 2 and 8 are used to adjust the supply current or to adjust the offset voltage (see text). These pins are normally left unconnected. -25°C to +85°C -55°C to +125°C -55°C to +125°C Typical Performance Gain Setting Parameter 1 2 5 -1 -3dB bandwidth 180 165 130 rise time (2V) 1.8 2.0 2.5 slew rate 2.5 3.0 3.0 settling time (to 0.1%) 12 12 12 165 150 115 2.0 2.2 2.9 3.0 3.0 3.0 12 12 15 KH231HXC KH231HXA -55°C to +125°C -55°C to +125°C 12-pin TO-8 can 12-pin TO-8 can, features burn-in & hermetic testing 12-pin TO-8 can, environmentally screened and electrically tested to MIL-STD-883 SMD#: 5962-8959401HXC SMD#: 5962-8959401HXA REV. 1A January 2004 DATA SHEET KH231 KH231 Electrical Characteristics (TA = +25°C, Av = +2V, VCC = ±15V, RL = 100Ω, Rf = 250Ω; unless specified) PARAMETERS Ambient Temperature Ambient Temperature FREQUENCY DOMAIN RESPONSE ¦ -3dB bandwidth (note 2) large-signal bandwidth gain flatness (note 2) ¦ peaking ¦ peaking ¦ rolloff group delay linear phase deviation reverse isolation non-inverting inverting TIME DOMAIN RESPONSE rise and fall time settling time to 0.05% to 0.1% overshoot slew rate (overdriven input) overload recovery 50MHz at 100MHz to 100MHz to 100MHz TYP +25°C +25°C 165 95 0.1 0.1 0.4 3.5 ± 0.5 0.5 53 36 2V step 10V step 5V step 2.5V step 5V step