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 AD8312 is a complete, low cost subsystem for the measurement of RF signals in the frequency range of 50 MHz to 3.5 GHz. It has a typical dynamic range of 45 dB and is intended for use in a wide variety of cellular handsets and other wireless devices. It provides a wider dynamic range and better accuracy than possible using discrete diode detectors. In particular, its temperature stability is excellent over the full operating range of ?40?C to +85?C.Its high sensitivity allows measurement at low power levels, thus reducing the amount of power that needs to be coupled to the detector. It is essentially a voltage-responding device, with a typical signal range of 1.25 mV to 224 mV rms or ?45 dBm to 0 dBm, referencing 50 ?.For convenience, the signal is internally ac-coupled, using a 5 pF capacitor to a load of 3 k? in shunt with 1.3 pF. This high-pass coupling, with a corner at approximately 16 MHz, determines the lowest operating frequency. Therefore, the source may be dc grounded.The AD8312 output, VOUT, increases from close to ground to about 1.2 V because the input signal level increases from 1.25 mV to 224 mV. A capacitor may be connected between the VOUT and CFLT pins when it is desirable to increase the time interval over which averaging of the input waveform occurs.The AD8312 is available in a 6-ball, 1.0 mm ? 1.5 mm, wafer-level chip scale package and consumes 4.2 mA from a 2.7 V to 5.5 V supply.Applications Cellular handsets (GSM, CDMA, WCDMA) RSSI and TSSI for wireless terminal devices Transmitter power measurement

The AD8318 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output voltage. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device is used in measurement or controller mode. The AD8318 maintains accurate log conformance for signals of 1 MHz to 6 GHz and provides useful operation to 8 GHz. The input range is typically 60 dB (re: 50 ?) with error less than ?1 dB. The AD8318 has a 10 ns response time that enables RF burst detection to beyond 45 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A 2 mV/?C slope temperature sensor output is also provided for additional system monitoring. A single supply of 5 V is required. Current consumption is typically 68 mA. Power consumption decreases to <1.5 mW when the device is disabled.?The AD8318 can be configured to provide a control voltage to a VGA, such as a power amplifier or a measurement output, from Pin VOUT. Because the output can be used for controller applications, wideband noise is minimal.In this mode, the setpoint control voltage is applied to VSET. The feedback loop through an RF amplifier is closed via VOUT, the output of which regulates the amplifier output to a magnitude corresponding to VSET. The AD8318 provides 0 V to 4.9 V output capability at the VOUT pin, suitable for controller applications. As a measurement device, Pin VOUT is externally connected to VSET to produce an output voltage, VOUT, which is a decreasing linear-in-dB function of the RF input signal amplitude.The logarithmic slope is nominally ?25 mV/dB but can be adjusted by scaling the feedback voltage from VOUT to the VSET interface. The intercept is 20 dBm (re: 50 ?, CW input) using the INHI input. These parameters are very stable against supply and temperature variations.The AD8318 is fabricated on a SiGe bipolar IC process and is available in a 4 mm ? 4 mm, 16-lead LFCSP for the operating temperature range of ?40?C to +85?C.Applications RF transmitter PA setpoint control and level monitoring RSSI measurement in base stations, WLAN, WiMAX, and radars

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.