Analog Devices

The AD844 is a high speed monolithic operational amplifier fabricated using the Analog Devices, Inc., junction isolated complementary bipolar (CB) process. It combines high bandwidth and very fast large signal response with excellent dc performance. Although optimized for use in current-to-voltage applications and as an inverting mode amplifier, it is also suitable for use in many noninverting applications.The AD844 can be used in place of traditional op amps, but its current feedback architecture results in much better ac performance, high linearity, and an exceptionally clean pulse response.This type of op amp provides a closed-loop bandwidth that is determined primarily by the feedback resistor and is almost independent of the closed-loop gain. The AD844 is free from the slew rate limitations inherent in traditional op amps and other current-feedback op amps. Peak output rate of change can be over 2000 V/μs for a full 20 V output step. Settling time is typically 100 ns to 0.1%, and essentially independent of gain. The AD844 can drive 50 Ω loads to ±2.5 V with low distortion and is short-circuit protected to 80 mA.The AD844 is available in four performance grades and three package options. In the 16-lead SOIC (RW) package, the AD844J is specified for the commercial temperature range of 0°C to 70°C.The AD844A and AD844B are specified for the industrial temperature range of −40°C to +85°C and are available in the CERDIP (Q) package. The AD844A is also available in an 8-lead PDIP (N). The AD844S is specified over the military temperature range of −55°C to +125°C. It is available in the 8-lead CERDIP (Q) package. A and S grade chips and devices processed to MIL-STD-883B, Rev. C are also available.Product HighlightsThe AD844 is a versatile, low cost component providing an excellent combination of ac and dc performance.It is essentially free from slew rate limitations. Rise and fall times are essentially independent of output level.The AD844 can be operated from ±4.5 V to ±18 V power supplies and is capable of driving loads down to 50 Ω, as well as driving very large capacitive loads using an external network.The offset voltage and input bias currents of the AD844 are laser trimmed to minimize dc errors; VOSdrift is typically 1 μV/°C and bias current drift is typically 9 nA/°C.The AD844 exhibits excellent differential gain and differential phase characteristics, making it suitable for a variety of video applications with bandwidths up to 60 MHz.The AD844 combines low distortion, low noise, and low drift with wide bandwidth, making it outstanding as an input amplifier for flash analog-to-digital converters (ADCs).ApplicationsFlash ADC input amplifiersHigh speed current DAC interfacesVideo buffers and cable driversPulse amplifiers

The AD8451 is a precision analog front end and controller for testing and monitoring battery cells. A precision fixed gain instrumentation amplifier (IA) measures the battery charge/discharge current, and a fixed gain difference amplifier (DA) measures the battery voltage. Internal laser trimmed resistor networks set the gains for the IA and the DA, optimizing the performance of the AD8451 over the rated temperature range. The IA gain is 26 and the DA gain is 0.8 V/V.Voltages at the ISET and VSET inputs set the desired constant current (CC) and constant voltage (CV) values. CC to CV switching is automatic and transparent to the system.A TTL logic level input, MODE, selects the charge or discharge mode (high for charge, low for discharge). An analog output, VCTRL, interfaces directly with the Analog Devices, Inc.,ADP1972PWM controller.The AD8451 simplifies designs by providing excellent accuracy, performance over temperature, flexibility with functionality, and overall reliability in a space-saving package. The AD8451 is available in an 80-lead, 14 mm × 14 mm × 1 mm LQFP package and is rated for an operating temperature of −40°C to +85°C.APPLICATIONSBattery cell formation and testingBattery module testing

The AD8460 is a "bits in, power out" high voltage, high-power, high-speed driver optimized for large output current (up to ±1 A) and high slew rate (up to ±1800 V/μs) at high voltage (up to ±40 V) into capacitive loads. Combining a 14-bit high-speed DAC, a high voltage, high output current (HV-HI) analog driver, and fault monitoring and protection circuits, the AD8460 is ideally suited for high power applications such as arbitrary waveform generation (AWG), programmable power supplies, and high voltage automated test equipment (ATE).A proprietary high-voltage BCDMOS process, novel high voltage architecture, and thermally enhanced package from Analog Devices Inc. enable this high-performance driver. A digital engine implements user-configurable features: modes for digital input, programmable supply current, and fault monitoring and programmable protection settings for output current, output voltage, and junction temperature. Analog features extend functionality: external compensation enables unlimited capacitive load drive, programmable shutdown delay, and full-scale adjustment. The AD8460 operates on high voltage dual supplies up to ±55 V and a single low voltage supply of 5 V.APPLICATIONSAutomatic test equipment (ATE)Display panel formation and testingPiezo driversProgrammable power supplies

The AD8465 is a very fast comparator fabricated on the Analog Devices, Inc., proprietary XFCB2 process. This comparator is exceptionally versatile and easy to use. Features include an input range from VEE− 0.5 V to VCCI+ 0.2 V, low noise, LVDS-compatible output drivers, and TTL/CMOS latch inputs with adjustable hysteresis and/or shutdown inputs. The device offers 1.6 ns propagation delay with 1 ps rms random jitter (RJ). Overdrive and slew rate dispersion are typically less than 50 ps.A flexible power supply scheme allows the devices to operate with a single 2.5 V positive supply and a −0.5 V to +2.7 V input signal range up to a 5.5 V positive supply with a −0.5 V to +5.7 V input signal range. Split input/output supplies, with no sequencing restrictions, support a wide input signal range with greatly reduced power consumption.The LVDS-compatible output stage is designed to drive any standard LVDS input. The comparator input stage offers robust protection against large input overdrive, and the outputs do not phase reverse when the valid input signal range is exceeded. High speed latch and programmable hysteresis features are also provided in a unique single-pin control option. The AD8465 is available in a 12-lead LFCSP.ApplicationsHigh speed instrumentationClock and data signal restorationLogic level shifting or translationPulse spectroscopyHigh speed line receiversThreshold detectionPeak and zero-crossing detectorsHigh speed trigger circuitryPulse-width modulatorsCurrent-/voltage-controlled oscillatorsAutomatic test equipment (ATE)Automotive

The AD847 represents a breakthrough in high speed amplifiers offing superior ac & dc perfomance and low power, all at low cost. The excellent dc performance is demonstrated by its ±5 V specifications which include an open-loop gain of 3500 V/V (500 Ohm load) and low input offset voltage of 0.5 mV. Common-mode rejection is a minimum of 78 dB. Output voltage swing is ±3 V into loads as low as 150 Ohm. Analog Devices also offers over 30 other high speed amplifiers from the low noise AD829 (1.7nV/(root)Hz) to the ultimate video amplifier, the AD811, which features 0.01% differential gain and 0.01° differential phase.

The AD8475 is a fully differential, attenuating amplifier with integrated precision gain resistors. It provides precision attenuation (by 0.4 or 0.8), common-mode level shifting, and single-ended-to-differential conversion along with input overvoltage protection. Power dissipation on a single 5 V supply is only 16 mW.The AD8475 is a simple to use, fully integrated precision gain block, designed to process signal levels of up to ±10 V on a single supply. It provides a complete interface to make industrial level signals directly compatible with the differential input ranges of low voltage high performance 16-bit or 18-bit single-supply successive approximation (SAR) analog-to-digital converters (ADCs).The AD8475 comes with two standard pin-selectable gain options: 0.4 and 0.8. The gain of the part is set by driving the input pin corresponding to the appropriate gain.The AD8475 also provides overvoltage protection from large industrial input voltages up to ±15 V while operating on a single 5 V supply. The VOCM pin adjusts the output voltage common mode for precision level shifting, to match the ADC’s input range and maximize dynamic range.The AD8475 works extremely well with SAR, Σ-Δ, and pipeline converters. The high current output stage of the part allows it to drive the switched capacitor front-end circuits of many ADCs with minimal error.Unlike many differential drivers in the market, the AD8475 is a high precision amplifier. With 500 μV maximum output offset, 10 nV/√Hz output noise, and −112 dB THD + N, the AD8475 pairs well with high accuracy converters. Considering its low power consumption and high precision, the slew-enhanced AD8475 has excellent speed, settling to 18-bit precision for 4 MSPS acquisition.The AD8475 is available in a space-saving 16-lead 3 mm × 3 mm LFCSP package and a 10-lead MSOP package. It is fully specified over the −40°C to +85°C temperature range.ApplicationsADC driversDifferential instrumentation amplifier building blocksSingle-ended-to-differential converters

The AD8476 is a very low power, fully differential precision amplifier with integrated gain resistors for unity gain. It is an ideal choice for driving low power, high performance ADCs as a single-ended-to-differential or differential-to-differential amplifier. It provides a precision gain of 1, common-mode level shifting, low temperature drift, and rail-to-rail outputs for maximum dynamic range.The AD8476 also provides overvoltage protection from large industrial input voltages up to ±23 V while operating on a dual 5 V supply. Power dissipation on a single 5 V supply is only 1.5 mW.The AD8476 works well with SAR, Σ-Δ, and pipeline converters. The high current output stage of the part allows it to drive the switched capacitor front-end circuits of many ADCs with minimal error.Unlike many differential drivers on the market, the AD8476 is a high precision amplifier. With 200 μV maximum output offset, 39 nV/√Hz noise, and −102 dB THD + N at 10 kHz, the AD8476 pairs well with low power, high accuracy converters.Considering its low power consumption and high precision, the slew-enhanced AD8476 has excellent speed, settling to 16-bit precision for 250 kSPS acquisition times.The AD8476 is available in a space-saving 8-lead MSOP package. It is fully specified over the −40°C to +125°C temperature range.ApplicationsADC driverDifferential instrumentation amplifier building blockSingle-ended-to-differential converterBattery powered instruments