The AD8276/AD8277?are general-purpose, unity-gain difference amplifiers intended for precision signal conditioning in power critical applications that require both high performance and low power. They provide exceptional 86 dB common-mode rejection ratio (CMRR) and high bandwidth while amplifying signals well beyond the supply rails. The on-chip resistors are laser trimmed for gain drift of 1 ppm/?C and high CMRR. The AD8276/AD8277 also have extremely low gain drift vs. temperature.The common-mode range of the amplifiers extends to almost double the supply voltage, making these amplifiers ideal for single-supply applications that require a high common-mode voltage range. The internal resistors and electrostatic discharge (ESD) circuitry at the inputs also provide overvoltage protection to the op amps.The AD8276/AD8277 are unity-gain stable. Although they are optimized for use as difference amplifiers, they can also be connected in high precision, single-ended configurations with G = ?1, +1, or +2. The AD8276/AD8277 provide an integrated precision solution that has smaller size, lower cost, and improved performance than a discrete alternative.The AD8276/AD8277 operate on single supplies (2.0 V to 36 V) or dual supplies (?2 V to ?18 V). The maximum quiescent supply current is 200 ?A per channel, which is ideal for battery-operated and portable systems.The AD8276 is available in the space-saving 8-lead mini small outline package (MSOP) and the standard small outline (SOIC) package, as well as in die form, and the AD8277 is offered in a 14-lead SOIC package. Both are specified for performance over the industrial temperature range of ?40?C to +85?C and are fully RoHS compliant.Applications Voltage measurement and monitoring Current measurement and monitoring Differential output instrumentation amplifier Portable, battery-powered equipment Test and measurement

The AD8304 is a monolithic logarithmic detector optimized for the measurement of low frequency signal power in fiber optic systems. It uses an advanced translinear technique to provide an exceptionally large dynamic range in a versatile and easily used form. Its wide measurement range and accuracy are achieved using proprietary design techniques and precise laser trimming. In most applications only a single positive supply, VP, of 5 V will be required, but 3.0 V to 5.5 V can be used, and certain applications benefit from the added use of a negative supply, VN. When using low supply voltages, the log slope is readily altered to fit the available span. The low quiescent current and chip disable features facilitate use in battery-operated applications.The AD8304 is available in a 14-lead TSSOP package and specified for operation from -40?C to +85?C.

The AD8306 is a complete IF limiting amplifier, providing bothan accurate logarithmic (decibel) measure of the input signal(the RSSI function) over a dynamic range of 100 dB, and aprogrammable limiter output, useful from 5 MHz to 400 MHz.An evaluation board is available for this product and may be ordered using the following product number: AD8306-EVAL. Schematic and layout for this evaluation board is contained in the product datasheet.

The AD8337 is a low noise, single-ended, linear-in-dB, general-purpose variable gain amplifier (VGA) usable at frequencies from dc to 100 MHz; the ?3 dB bandwidth is 280 MHz. Excellent bandwidth uniformity across the entire gain range and low output-referred noise makes the AD8337 ideal for gain trim applications and for driving high speed analog-to-digital converters (ADCs).Excellent dc characteristics combined with high speed make the AD8337 particularly suited for industrial ultrasound, PET scanners, and video applications. Dual-supply operation enables gain control of negative-going pulses such as generated by photodiodes or photomultiplier tubes.The AD8337 uses the popular and versatile X-AMP? architecture, exclusively from Analog Devices, Inc., with a gain range of 24 dB. The gain control interface provides precise linear-in-dB scaling of 19.7 dB/V, referenced to VCOM.The AD8337 includes an uncommitted operational current-feedback preamplifier (PrA) that operates in inverting or noninverting configurations. Using external resistors, the device can be configured for gains of 6 dB or greater. The AD8337 is characterized by a noninverting PrA gain of 2? using two external 100 ? resistors. The attenuator has a range of 24 dB, and the output amplifier has a fixed gain of 8? (18.06 dB). The lowest nominal gain range is 0 dB to 24 dB and can be shifted up or down by adjusting the preamp gain. Multiple AD8337s can be connected in series for larger gain ranges, and for interstage filtering to suppress noise and distortion, and for nulling offset voltages.The operating temperature range is ?40?C to +85?C, and it is available in an 8-lead, 3 mm ? 3 mm LFCSP.Applications Gain trim PET scanners High performance AGC systems I/Q signal processing Video Industrial and medical ultrasound Radar receivers

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 ? 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 AD8339 is a quad I/Q demodulator configured to be driven by a low noise preamplifier with differential outputs. It is optimized for the LNA in the AD8332 / AD8334 / AD8335 family of VGAs. The part consists of four identical I/Q demodulators with a 4? local oscillator (LO) input that divides this signal and generates the necessary 0? and 90? phases of the internal LO that drive the mixers. The four I/Q demodulators can be used independently of each other (assuming that a common LO is acceptable) because each has a separate RF input.Continuous wave (CW) analog beamforming (ABF) and I/Q demodulation are combined in a single 40-lead ultracompact chip scale device, making the AD8339 particularly applicable in high density ultrasound scanners. In an ABF system, time domain coherency is achieved following the appropriate phase alignment and summation of multiple receiver channels. A reset pin synchronizes multiple ICs to start each LO divider in the same quadrant. Sixteen programmable 22.5? phase increments are available for each channel. For example, if Channel 1 is used as a reference and Channel 2 has an I/Q phase lead of 45?, then the user can phase align Channel 2 with Channel 1 by choosing the correct code.The mixer outputs are in current form for convenient summation. The independent I and Q mixer output currents are summed and converted to a voltage by a low noise, high dynamic range, current-to-voltage (I-V) transimpedance amplifier, such as the AD8021?or the AD829. Following the current summation, the combined signal is applied to a high resolution analog-to-digital converter (ADC), such as the AD7665?(16-bit, 570 kSPS).An SPI-compatible serial interface port is provided to easily program the phase of each channel; the interface allows daisy chaining by shifting the data through each chip from SDI to SDO. The SPI also allows for power-down of each individual channel and the complete chip. During power-down, the serial interface remains active so that the device can be programmed again.The dynamic range is typically 160 dB/Hz at the I and Q outputs. The AD8339 is available in a 6 mm ? 6 mm, 40-lead LFCSP and is specified over the industrial temperature range of ?40?C to +85?C.APPLICATIONS Medical imaging (CW ultrasound beamforming) Phased array systems Radar Adaptive antennas Communication receivers

The AD8341 vector modulator performs arbitrary amplitudeand phase modulation of an RF signal. Because the RF signalpath is linear, the original modulation is preserved. This part canbe used as a general-purpose RF modulator, a variable attenuator/phase shifter, or a remodulator. The amplitude can be controlledfrom a maximum of ?4.5 dB to less than ?34.5 dB, and the phasecan be shifted continuously over the entire 360? range. For maximumgain, the AD8341 delivers an OP1dB of 8.5 dBm, an OIP3of 17.5 dBm, and an output noise floor of ?150.5 dBm/Hz,independent of phase. It operates over a frequency range of1.5 GHz to 2.4 GHz.The baseband inputs in Cartesian I and Q format control theamplitude and phase modulation imposed on the RF inputsignal. Both I and Q inputs are dc-coupled with a ?500 mVdifferential full-scale range. The maximum modulationbandwidth is 230 MHz, which can be reduced by adding externalcapacitors to limit the noise bandwidth on the control lines.Both the RF inputs and outputs can be used differentially orsingle-ended and must be ac-coupled. The RF input and outputimpedances are nominally 50 ? over the operating frequencyrange. The DSOP pin allows the output stage to be disabledquickly in order to protect subsequent stages from overdrive.The AD8341 operates off supply voltages from 4.75 V to 5.25 Vwhile consuming approximately 125 mA.The AD8341 is fabricated on Analog Devices? proprietary, highperformance 25 GHz SOI complementary bipolar IC process. Itis available in a 24-lead, lead-free LFCSP package and operatesover a ?40?C to +85?C temperature range. Evaluation boardsare available. Applications RF PA linearization/RF predistortion Amplitude and phase modulation Variable attenuators and phase shifters CDMA2000, WCDMA, GSM/EDGE linear power amplifiers Smart antennasAvailabilitySamples part number AD8341ACP and an evaluation board, part number AD8341-EVAL, are available.Companion ProductsAD8302 - LF - 2.7GHz RF/IF Gain Phase DetectorAD8340 - RF Vector Modulator 700MHz to 1000MHzOther Modulator / Demodulator ProductsAD8345 - 250MHz to 1000MHz Low Noise RF/IF ModulatorAD8346 - 800MHz to 2.5GHz Lower Power Direct Up-Conversion ModulatorAD8347 - 800MHz to 2.7GHz Direct Conversion DemodulatorAD8348 - 50MHz to 1000MHz RF/IF Quadrature DemodulatorAD8349 - 700MHz - 2.7GHz Low Noise Direct Up Conversion Modulator

The AD8361 is a mean-responding power detector for use inhigh frequency receiver and transmitter signal chains, up to2.5 GHz. It is very easy to apply. It requires a single supply onlybetween 2.7 V and 5.5 V, a power supply decoupling capacitor,and an input coupling capacitor in most applications. Theoutput is a linear-responding dc voltage with a conversion gainof 7.5 V/V rms. An external filter capacitor can be added toincrease the averaging time constant.The AD8361 is intended for true power measurement of simpleand complex waveforms. The device is particularly useful formeasuring high crest-factor (high peak-to-rms ratio) signals,such as CDMA and W-CDMA.The AD8361 has three operating modes to accommodate avariety of analog-to-digital converter requirements: Ground reference mode, in which the origin is zero. Internal reference mode, which offsets the output 350 mV above ground. Supply reference mode, which offsets the output to VS/7.5.The AD8361 is specified for operation from ?40?C to +85?Cand is available in 8-lead MSOP and 6-lead SOT-23 packages. Itis fabricated on a proprietary high fT silicon bipolar process.

The AD8364 is a true rms, responding, dual-channel RF powermeasurement subsystem for the precise measurement and controlof signal power. The flexibility of the AD8364 allows communicationssystems, such as RF power amplifiers and radio transceiverAGC circuits, to be monitored and controlled with ease. Operatingon a single 5 V supply, each channel is fully specified for operationup to 2.7 GHz over a dynamic range of 60 dB. The AD8364provides accurately scaled, independent, rms outputs of both RFmeasurement channels. Difference output ports, which measurethe difference between the two channels, are also available. Theon-chip channel matching makes the rms channel differenceoutputs extremely stable with temperature and process variations.The device also includes a useful temperature sensor with anaccurately scaled voltage proportional to temperature, specifiedover the device operating temperature range. The AD8364 canbe used with input signals having rms values from ?55 dBm to+5 dBm referred to 50 ? and large crest factors with noaccuracy degradation. Integrated in the AD8364 are two matched AD8362 channels(see the AD8362 data sheet for more information) with improvedtemperature performance and reduced log conformance ripple.Enhancements include improved temperature performance andreduced log-conformance ripple compared to the AD8362. On-chipwide bandwidth output operational amplifiers are connectedto accom-modate flexible configurations that support manysystem solutions.The device can easily be configured to provide four rmsmeasurements simultaneously. Linear-in-dB rms measurementsare supplied at OUTA and OUTB, with conveniently scaledslopes of 50 mV/dB. The rms difference between OUTA andOUTB is available as differential or single-ended signals atOUTP and OUTN. An optional voltage applied to VLVLprovides a common mode reference level to offset OUTP andOUTN above ground.The AD8364 is supplied in a 32-lead, 5 mm ? 5 mm LFCSP, forthe operating temperature of ?40?C to +85?C.Applications Wireless infrastructure power amplifier linearization/control Antenna VSWR monitor Gain and power control and measurement Transmitter signal strength indication (TSSI) Dual-channel wireless infrastructure radios

The AD8372 is a dual, digitally controlled, variable gainamplifier (VGA) that provides precise gain control, high IP3,and low noise figure. The excellent distortion performance andmoderate signal bandwidth make the AD8372 a suitable gain control device for a variety of multichannel receiverapplications.For wide input dynamic range applications, the AD8372provides a broad 41 dB gain range. The gain is programmedthrough a bidirectional 4-pin serial interface. The serial interface consists of a clock, latch, data input, and data output linesfor each channel. The AD8372 provides the ability to set the transconductance of the output stage using a single external resistor. The RXT1 and RXT2 pins provide a band gap derived stable reference voltage of 1.56 V. Typically 2.0 k? shunt resistors to ground are used toset the maximum gain to a nominal value of 31 dB. The currentsetting resistors can be adjusted to manipulate the gain anddistortion performance of each channel. This is a flexible feature in applications where it is desirable to trade off distortion performance for lower power consumption.The AD8372 is powered on by applying the appropriate logiclevel to the ENB1, ENB2 pins. When powered down, the AD8372consumes less than 2.6 mA and offers excellent input-to-outputisolation. The gain setting is preserved when powered down.Fabricated on an Analog Devices, Inc., high frequency BiCMOS process, the AD8372 provides precise gain adjustment capabilities with good distortion performance. The quiescent current of theAD8372 is typically 106 mA per channel. The AD8372 amplifier comes in a compact, thermally enhanced 5 mm ? 5 mm 32-leadLFCSP package and operates over the temperature range of ?40?C to +85?C.Applications Differential ADC drivers CMTS upstream direct sampling receivers CATV modem signal scaling Generic RF/IF gain stages Single-ended-to-differential conversion