2.7 V, 800 μA, 80 MHzRail-to-Rail I/O Amplifiers AD8032ARZ

FEATURES

Low powerSupply current 800 μA/amplifierFully specified at +2.7 V, +5 V, and ±5 V suppliesHigh speed and fast settling on 5 V80 MHz, −3 dB bandwidth (G = +1)30 V/μs slew rate125 ns settling time to 0.1%Rail-to-rail input and output

No phase reversal with input 0.5 V beyond suppliesInput CMVR extends beyond rails by 200 mV

Output swing to within 20 mV of either railLow distortion−62 dB @ 1 MHz, VO = 2 V p-p−86 dB @ 100 kHz, VO = 4.6 V p-p

Output current: 15 mAHigh grade option: VOS (maximum) = 1.5 mVAPPLICATIONSHigh speed, battery-operated systems

High component density systemsPortable test instrumentsA/D buffersActive filtersHigh speed, set-and-demand amplifiers

GENERAL DESCRIPTION

The AD8031 (single) and AD8032 (dual) single-supply, voltagefeedback amplifiers feature high speed performance with80 MHz of small signal bandwidth, 30 V/μs slew rate, and 125 nssettling time. 

This performance is possible while consuming lessthan 4.0 mW of power from a single 5 V supply. 

These featuresincrease the operation time of high speed, battery-poweredsystems without compromising dynamic performance.

The products have true single-supply capability with rail-to-railinput and output characteristics and are specified for +2.7 V, +5 V,and ±5 V supplies. 

The input voltage range can extend to 500 mVbeyond each rail. The output voltage swings to within 20 mV ofeach rail providing the maximum output dynamic range.T

he AD8031/AD8032 also offer excellent signal quality for only800 μA of supply current per amplifier; 

THD is −62 dBc with a2 V p-p, 1 MHz output signal, and –86 dBc for a 100 kHz,4.6 V p-p signal on +5 V supply. 

The low distortion and fastsettling time make them ideal as buffers to single-supply ADCs

Operating on supplies from +2.7 V to +12 V and dual suppliesup to ±6 V, the AD8031/AD8032 are ideal for a wide range ofapplications, 

from battery-operated systems with large bandwidthrequirements to high speed systems where component densityrequires lower power dissipation. 

The AD8031/AD8032 areavailable in 8-lead PDIP and 8-lead SOIC_N packages andoperate over the industrial temperature range of −40°C to+85°C. 

The AD8031A is also available in the space-saving5-lead SOT-23 package, and the AD8032A is available in an8-lead MSOP package. 

THEORY OF OPERATION

The AD8031/AD8032 are single and dual versions of highspeed, low power, voltage feedback amplifiers featuring aninnovative architecture that maximizes the dynamic rangecapability on the inputs and outputs. 

The linear input commonmode range exceeds either supply voltage by 200 mV, and theamplifiers show no phase reversal up to 500 mV beyond supply.

The output swings to within 20 mV of either supply whendriving a light load; 300 mV when driving up to 5 mA.Fabricated on Analog Devices, Inc. eXtra Fast ComplementaryBipolar (XFCB) process, 

the amplifier provides an impressive80 MHz bandwidth when used as a follower and a 30 V/µs slewrate at only 800 µA supply current. Careful design allows theamplifier to operate with a supply voltage as low as 2.7 V.

INPUT STAGE OPERATIONA simplified schematic of the input stage appears in Figure 43.

For common-mode voltages up to 1.1 V within the positivesupply (0 V to 3.9 V on a single 5 V supply), tail current I2flows through the PNP differential pair, 

Q13 and Q17. Q5 is cutoff; no bias current is routed to the parallel NPN differentialpair, Q2 and Q3. 

As the common-mode voltage is driven within1.1 V of the positive supply, Q5 turns on and routes the tailcurrent away from the PNP pair and to the NPN pair.

 Duringthis transition region, the input current of the amplifier changesmagnitude and direction. 

Reusing the same tail current ensuresthat the input stage has the same transconductance, whichdetermines the gain and bandwidth of the amplifier, 

in bothregions of operation.Switching to the NPN pair as the common-mode voltage isdriven beyond 1 V within the positive supply allows the amplifierto provide useful 

operation for signals at either end of thesupply voltage range and eliminates the possibility of phasereversal for input signals up to 500 mV beyond either powersupply. 

Offset voltage also changes to reflect the offset of theinput pair in control. The transition region is small, approximately180 mV. 

These sudden changes in the dc parameters of theinput stage can produce glitches that adversely affect distortion.

OVERDRIVING THE INPUT STAGESustained input differential voltages greater than 3.4 V shouldbe avoided as the input transistors can be damaged. 

Input clampdiodes are recommended if the possibility of this conditionexists.The voltages at the collectors of the input pairs are set to200 mV from the power supply rails. T

his allows the amplifierto remain in linear operation for input voltages up to 500 mVbeyond the supply voltages. 

Driving the input common-modevoltage beyond that point will forward bias the collector junction ofthe input transistor, 

resulting in phase reversal. Sustaining thiscondition for any length of time should be avoided because it iseasy to exceed the maximum allowed input differential voltagewhen the amplifier is in phase reversal.

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 Delivery & Lifecycle Information:Analog Devices Inc.: AD8031ANZ AD8031ARTZ-REEL7 AD8031ARZ AD8031BNZ AD8031BRZ AD8032ANZ 

AD8032ARAD8032ARMZ AD8032ARMZ-REEL7 AD8032ARZ AD8032BRZ AD8032BR AD8032ARM AD8031BRAD8031ARZ-REEL 

AD8031ARZ-REEL7 AD8031BRZ-REEL7 AD8032ARM-REEL7 AD8032ARMZ-REELAD8032ARZ-REEL AD8032ARZ-REEL7

 AD8032BRZ-REEL AD8032BRZ-REEL7 AD8031ARTZ-R2

Analog Devices has built one of the longest standing, highest growth companies within the technology sector utilizing cultural pillars such as innovation, 

performance, and excellence. Acknowledged industry-wide as the world leader in data conversion and signal conditioning technology, 

Analog Devices serves over 100,000 customers, representing virtually all types of electronic equipment. 

Celebrating over 50 years as a leading global manufacturer of high-performance integrated circuits used in analog and digital signal processing applications, 

Analog Devices is headquartered in Norwood, Massachusetts, with design and manufacturing facilities throughout the world. Analog Devices' is included in the S&P 500 Index.

Analog Devices acquired Maxim Integrated. Combined, 

Analog Devices offers an expanded suite of top-performing mixed-signal and power management technologies to help customers succeed in an increasingly digital, ubiquitously sensed, and connected world.

Analog Devices acquired Hittite Microwave Products. Analog Devices' portfolio now spans the entire frequency spectrum of RF, microwave and millimeter wave.

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