The AD5700/AD5700-1 are single-chip solutions, designedand specified to operate as a HART® FSK half-duplex modem,complying with the HART physical layer requirements. TheAD5700/AD5700-1 integrate all of the necessary filtering, signaldetection, modulating, demodulating and signal generationfunctions, thus requiring few external components. The 0.5%precision internal oscillator on the AD5700-1 greatly reducesthe board space requirements, making it ideal for line-poweredapplications in both master and slave configurations. The maximumsupply current consumption is 115µA, making theAD5700/AD5700-1 an optimal choice for low power loop-powered applications.Transmit waveforms are phase continuous 1200 Hz and2200 Hz sinusoids. The AD5700/AD5700-1 contain accuratecarrier detect circuitry and use a standard UART interface.Applications Field transmitters HART multiplexers PLC and DCS analog I/O modules HART network connectivity

The AD7228A contains eight 8-bit voltage-mode digital-to-analog converters, with output buffer amplifiers and interface logic on a single monolithic chip. No external trims are required to achieve full specified performance for the part.Separate on-chip latches are provided for each of the eight D/A converters. Data is transferred into the data latches through a common 8-bit TTL/CMOS (5 V) compatible input port. Address inputs A0, A1 and A2 determine which latch is loadedwhen WR goes low. The control logic is speed compatible withmost 8-bit microprocessors.Specified performance is guaranteed for input reference voltages from +2 to +10 V when using dual supplies. The part is also specified for single supply +15 V operation using a reference of +10 V and single supply +5 V operation using a reference of +1.23 V. Each output buffer amplifier is capable of developing+10 V across a 2 kΩ load.The AD7228A is fabricated on an all ion-implanted, high-speed, Linear Compatible CMOS (LC2MOS) process which has been specifically developed to integrate high-speed digital logic circuits and precision analog circuits on the same chip.Product Highlights Eight DACs and Amplifiers in Small Package The single-chip design of eight 8-bit DACs and amplifiers allows a dramatic reduction in board space requirements and offers increased reliability in systems using multiple converters. Its pinout is aimed at optimizing board layout with all analog inputs and outputs at one side of the package and all digital inputs at the other. Single or Dual Supply Operation The voltage-mode configuration of the DACs allows single supply operation of the AD7228A. The part can also be operated with dual supplies giving enhanced performance for some parameters. Microprocessor Compatibility The AD7228A has a common 8-bit data bus with individual DAC latches, providing a versatile control architecture for simple interface to microprocessors. All latch enable signals are level triggered and speed compatible with most high performance 8-bit microprocessors.

The AD8229 is an ultralow noise instrumentation amplifierdesigned for measuring small signals in the presence of largecommon-mode voltages and high temperatures.The AD8229 has been designed for high temperature operation. The process is dielectrically isolated to avoid leakage currents at high temperatures. The design architecture was chosen to compensate for the low VBE voltages at high temperatures.The AD8229 excels at measuring tiny signals. It delivers industry leading 1 nV/√Hz input noise performance. The high CMRR of the AD8229 prevents unwanted signals from corrupting theacquisition. The CMRR increases as the gain increases, offering high rejection when it is most needed. The AD8229 is one of the fastest instrumentation amplifiersavailable. Its current feedback architecture provides high bandwidth at high gain, for example, 1.2 MHz at G = 100. Thedesign includes circuitry to improve settling time after largeinput voltage transients. The AD8229 was designed for excellentdistortion performance, allowing use in demanding applicationssuch as vibration analysis.Gain is set from 1 to 1000 with a single resistor. A reference pinallows the user to offset the output voltage. This feature can be useful when interfacing with analog-to-digital converters.For the most demanding applications, the AD8229 is availablein an 8-lead side-brazed ceramic dual in-line package (SBDIP).For space-constrained applications, the AD8229 is available inan 8-lead plastic standard small outline package (SOIC).The AD8229 is also available as Known Good DieApplications Down-hole instrumentation Harsh environment data acquisition Exhaust gas measurements Vibration analysis

The AD8237 is a micropower, zero drift, rail-to-rail input and output instrumentation amplifier. The relative match of two resistors sets any gain from 1 to 1000. The AD8237 has excellent gain accuracy performance that can be preserved at any gain with two ratio-matched resistors.The AD8237 employs the indirect current feedback architecture to achieve a true rail-to-rail capability. Unlike conventional in-amps, the AD8237 can fully amplify signals with common-mode voltage at or even slightly beyond its supplies. This enables applications with high common-mode voltages to use smaller supplies and save power.The AD8237 is an excellent choice for portable systems. With a minimum supply voltage of 1.8 V, a 115 μA typical supply current, and wide input range, the AD8237 makes full use of a limited power budget, yet offers bandwidth and drift performance suitable for bench-top systems.Applications Bridge amplification Pressure measurement Medical instrumentation Thermocouple interface Portable systems Current measurement

The AD8237 is a micropower, zero drift, rail-to-rail input and output instrumentation amplifier. The relative match of two resistors sets any gain from 1 to 1000. The AD8237 has excellent gain accuracy performance that can be preserved at any gain with two ratio-matched resistors.The AD8237 employs the indirect current feedback architecture to achieve a true rail-to-rail capability. Unlike conventional in-amps, the AD8237 can fully amplify signals with common-mode voltage at or even slightly beyond its supplies. This enables applications with high common-mode voltages to use smaller supplies and save power.The AD8237 is an excellent choice for portable systems. With a minimum supply voltage of 1.8 V, a 115 μA typical supply current, and wide input range, the AD8237 makes full use of a limited power budget, yet offers bandwidth and drift performance suitable for bench-top systems.Applications Bridge amplification Pressure measurement Medical instrumentation Thermocouple interface Portable systems Current measurement

The AD8338 is a variable gain amplifier (VGA) for applicationsthat require a fully differential signal path, low power, low noise,and a well-defined gain over frequency. Although the inputs aredifferential, the device can also be driven with a single-endedsource if required.The basic gain function is linear-in-dB and is controlled by thevoltage applied to Pin GAIN. The nominal gain range spansfrom 0 dB to 80 dB for control voltages between 0.1 V to 1.1 Vwith a slope of 12.5 mV/dB. The nominal gain range can beshifted up or down via direct access to Pin INPD and Pin INMD,the current inputs of the VGA. For example, driving the INPDand INMD pins with 50 Ω resistors shifts the gain range up by20 dB, that is, 20 dB to 100 dB, and lowers the input referrednoise of the device to 1.5 nV/√Hz. Additionally, the gain slopecan be inverted via logic Pin MODE.The AD8338 includes additional circuit blocks to enable inputoffset correction and automatic gain control (AGC). DC offsetvoltages are removed by the offset correction circuit, whichbehaves like a high-pass filter whose corner is set with an externalcapacitor. The AGC function varies the gain of the AD8338 tomaintain a constant rms output voltage. An externally appliedvoltage to Pin VAGC with respect to the voltage at Pin VREFsets the output rms amplitude. A capacitor from Pin DETO toground sets the response time of the AGC circuit.The AD8338 offers additional versatility by providing access tothe internal summing nodes of the VGA core and the outputamplifiers. With the addition of a few external passive components,users can customize the gain, bandwidth, input impedance, andnoise profile of the device to fit their application.The AD8338 uses a single-supply voltage of 3.0 V to 5.0 V andis very power efficient, consuming as little as 3 mA quiescentcurrent at mid gain. The AD8338 is available in a 3 mm × 3 mm,RoHS-compliant, 16-lead LFCSP and is specified over theindustrial temperature range of −40°C to +85°C.APPLICATIONS Front end for inductive telemetry systems Ultrasonic signal receivers Signal compression for driving an ADC AGC amplifiers

The AD8420 is a low cost, micropower, wide supply range, instrumentation amplifier with a rail-to-rail output and a novel architecture that allows for extremely flexible design. It is optimized to amplify small differential voltages in the presence of large common-mode signals.The AD8420 is based on an indirect current feedback architecture that gives it an excellent input common-mode range. Unlike conventional instrumentation amplifiers, the AD8420 can easily amplify signals at or even slightly below ground without requiring dual supplies. The AD8420 has rail-to-rail output, and the output voltage swing is completely independent of the input common-mode voltage.Single-supply operation, micropower current consumption, and rail-to-rail output swing make the AD8420 ideal for battery-powered applications. Its rail-to-rail output stage maximizes dynamic range when operating from low supply voltages. Dual-supply operation (±15 V) and low power consumption make the AD8420 ideal for a wide variety of applications in medical or industrial instrumentation.The AD8420 is available in an 8-lead MSOP package. Performance is specified over the full temperature range of −40°C to +85°C, and the part is operational from −40°C to +125°CAPPLICATIONS Bridge amplifiers Pressure Measurement Medical instrumentation Portable data acquisition Multichannel systems

The AD8426 is a dual-channel, low cost, wide supply range instrumentation amplifier that requires only one external resistor to set any gain from 1 to 1000.The AD8426 is designed to work with a variety of signal voltages. A wide input range and rail-to-rail output allow the signal to make full use of the supply rails. Because the input range can also go below the negative supply, small signals near ground can be amplified without requiring dual supplies. The AD8426 operates on supplies ranging from ±1.35 V to ±18 V for dual supplies and 2.2 V to 36 V for a single supply.The robust AD8426 inputs are designed to connect to real-world sensors. In addition to its wide operating range, the AD8426 can handle voltages beyond the rails. For example, with a ±5 V supply, the part is guaranteed to withstand ±35 V at the input with no damage. Minimum and maximum input bias currents are specified to facilitate open-wire detection.The AD8426 is designed to make PCB routing easy and efficient. The two amplifiers are arranged in a logical way so that typical application circuits have short routes and few vias. Unlike most chip scale packages, the AD8426 does not have an exposed metal pad on the bottom of the part, which frees additional space for routing and vias. The AD8426 offers two in-amps in the equivalent board space of a typical MSOP package.The AD8426 is ideal for multichannel, space-constrained industrial applications. Unlike other low cost, low power instrumentation amplifiers, the AD8426 is designed with a minimum gain of 1 and can easily handle ±10 V signals. With its space-saving LFCSP package and 125°C temperature rating, the AD8426 thrives in tightly packed, zero airflow designs.The AD8226 is the single channel version of the AD8426.APPLICATIONSIndustrial process controlsBridge amplifiersMedical instrumentationPortable data acquisitionMultichannel systems

The AD8429 is an ultralow noise, instrumentation amplifier designed for measuring extremely small signals over a wide temperature range (−40°C to +125°C).The AD8429 excels at measuring tiny signals. It delivers ultralow input noise performance of 1 nV/√Hz. The high CMRR of the AD8429 prevents unwanted signals from corrupting the acqui-sition. The CMRR increases as the gain increases, offering high rejection when it is most needed. The high performance pin configuration of the AD8429 allows it to reliably maintain high CMRR at frequencies well beyond those of typical instrumentation amplifiers.The AD8429 reliably amplifies fast changing signals. Its current feedback architecture provides high bandwidth at high gain, for example, 1.2 MHz at G = 100. The design includes circuitry to im-prove settling time after large input voltage transients. The AD8429 was designed for excellent distortion performance, allowing use in demanding applications such as vibration analysis.Gain is set from 1 to 10,000 with a single resistor. A reference pin allows the user to offset the output voltage. This feature can be useful to shift the output level when interfacing to a single supply signal chain.The AD8429 performance is specified over the extended industrial temperature range of −40°C to +125°C. It is available in an 8-lead plastic SOIC package.APPLICATIONSMedical instrumentationPrecision data acquisitionMicrophone preamplificationVibration analysis

The AD8450 is a precision analog front end for testing andmonitoring battery cells. Referring to figure one, a precisionprogrammable gain instrumentation amplifier (PGIA)measures the battery’s charge/discharge current and aprogrammable gain difference amplifier (PGDA) measures thebattery’s voltage. Internal laser trimmed resistor networks setthe gains for the PGIA and the PGDA, optimizing the AD8450’sperformance over the rated temperature range. PGIA gains are26×, 66×, 133×, and 200×. PGDA gains are 0.2×, 0.27×,0.4×,and 0.8×.Voltages at the ISET and VSET inputs set the desired constantvoltage (CV) and constant current (CC) values. CC to CVswitching is automatic and transparent to the system.A TTL level logic input, MODE, selects between charge anddischarge modes (high for charge, low for discharge). An analogoutput, VCTRL, interfaces directly with ADI’s ADP1972 &ADP1974 PWM controllers.The AD8450 includes resistor programmable overvoltage andovercurrent detection and current sharing circuitry. Currentsharing is used to balance charge among multiple batteries.The AD8450 simplifies designs by providing excellent accuracy,performance over temperature, flexibility with functionality,and overall reliability in a space-saving package. The AD8450 isavailable in an 80 lead 14 mm ×14 mm × 1 mm LQFP packageand is rated at −40 °C to +85 °C operating temperature.APPLICATIONS Battery cell testing & formation Battery module testing