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MAX4285 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX4285 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 16 page +3V/+5V, 250MHz, SOT23 ADC Buffer Amplifiers with High-Speed Disable ______________________________________________________________________________________ 11 Pin Description 14-PIN SO 10-PIN µMAX 8-PIN SO 6-PIN SOT23-6 8-PIN µMAX/SO Amplifier B Inverting Input Amplifier B Noninverting Input Amplifier B Output 12 11 13 8 7 9 — — — — 6 INB- — 5 INB+ — 7 OUTB FUNCTION Not Internally Connected. Connect to ground or leave unconnected. Amplifier Output Negative Power Supply, or Ground in Single-Supply Operation Disable Amplifier A (active low) Disable (active low) Inverting Input Noninverting Input Amplifier A Noninverting Input Amplifier A Inverting Input Amplifier A Output Positive Power Supply Disable Amplifier B (active low) 5, 7, 8, 10 — 4 6 — — — 3 2 1 14 9 — — 4 5 — — — 3 2 1 10 6 1, 5 6 4 — 8 2 3 — — — 7 — NAME — — N.C. 1 — OUT 2 4 VEE — — DISABLEA 5 — DISABLE 4 — IN- 3 — IN+ — 3 INA+ — 2 INA- — 1 OUTA 6 8 VCC — — DISABLEB Detailed Description The MAX4285–MAX4288 and MAX4387/MAX4388 are voltage-feedback op amps, intended for use as ADC input buffers. They operate from a single +2.85V to +6.5V supply or dual ±1.425V to ±3.25V supplies. Their high output drive, wide bandwidth, fast settling, low noise, and low distortion make them ideal for the brutal task of meeting the dynamic input drive requirements of high-speed ADCs or other demanding applications. The MAX4285/MAX4286/MAX4288 and MAX4388 have a high-speed disable mode that places the outputs in a high-impedance state and lowers operating supply cur- rent to 1mA. The enable time is typically 40ns, and the disable time is typically 50ns. The MAX4285/MAX4286 have a single enable pin (DISABLE), and the MAX4288/ MAX4388 have dual disable pins (DISABLEA, DISA- BLEB). The MAX4285/MAX4287/MAX4288 are internally com- pensated for unity-gain stability. The MAX4286/ MAX4387/MAX4388 are compensated for gains of +5V/V or greater. Applications Information Inverting and Noninverting Configurations Select the gain-setting feedback (RF) and input (RG) resistor values considering the following criteria: large resistor values increase voltage noise and interact with the amplifier’s input and PC board capacitance to effect system bandwidth. This generates undesirable poles and zeros that decrease bandwidth or cause oscillations. PIN MAX4285 MAX4286 MAX4287 MAX4387 MAX4288 MAX4388 |
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