The AD8313 is a complete multistage demodulating logarithmic amplifier that can accurately convert an RF signal at its input to an equivalent decibel-scaled value at its dc output. The AD8313 maintains a high degree of log conformance for signal frequencies from 0.1 GHz to 2.5 GHz. Application is straightforward, requiring only a single supply of 2.7 V to 5.5 V and the addition of a suitable input and supply decoupling. Operating on a 3 V supply, its 13.7 mA consumption (for TA = 25?C) is only 41 mW. A power-down feature is provided; the input is taken high to initiate a low current (20 ?A) sleep mode, with a threshold at half the supply voltageThe AD8313 is fabricated on Analog Devices, Inc., advanced 25 GHz silicon bipolar IC process and is available in an 8-lead MSOP package. The operating temperature range is ?40?C to +85?C.

The AD8317 is a demodulating logarithmic amplifier, capable of accurately converting an RF input signal to a corresponding decibel-scaled output. It employs the progressive compression technique over a cascaded amplifier chain, each stage of which is equipped with a detector cell. The device can be used in either measurement or controller modes. The AD8317 maintains accurate log conformance for signals of 1 MHz to 8 GHz and provides useful operation to 10 GHz. The input dynamic range is typically 55 dB (referenced to 50 ?) with less than ?3 dB error. The AD8317 has 6 ns/10 ns response time (fall time/rise time) that enables RF burst detection to a pulse rate of beyond 50 MHz. The device provides unprecedented logarithmic intercept stability vs. ambient temperature conditions. A supply of 3.0 V to 5.5 V is required to power the device. Current consumption is typically 22 mA, and it decreases to 200 ?A when the device is disabled.The AD8317 can be configured to provide a control voltage to a power amplifier or a measurement output from the VOUT pin. Because the output can be used for controller applications, special attention has been paid to minimize wideband noise. In this mode, the setpoint control voltage is applied to the VSET pin.The feedback loop through an RF amplifier is closed via VOUT, the output of which regulates the output of the amplifier to a magnitude corresponding to VSET. The AD8317 provides 0 V to (VPOS ? 0.1 V) output capability at the VOUT pin, suitable for controller applications. As a measurement device, VOUT is externally connected to VSET to produce an output voltage, VOUT, that is a decreasing linear-in-dB function of the RF input signal amplitude.The logarithmic slope is ?22 mV/dB, determined by the VSET interface. The intercept is 15 dBm (referenced to 50 ?, CW input) using the INHI input. These parameters are very stable against supply and temperature variations.The AD8317 is fabricated on a SiGe bipolar IC process and is available in a 2 mm ? 3 mm, 8-lead LFCSP with an operating temperature range of ?40?C to +85?C.Applications RF transmitter PA setpoint control and level monitoring Power monitoring in radio link transmitters RSSI measurement in base stations, WLANs, WiMAX, and radars

The AD8330 is a wideband variable gain amplifier for applicationsrequiring a fully differential signal path, low noise, well-definedgain, and moderately low distortion, from dc to 150 MHz. Theinput pins can also be driven from a single-ended source. Thepeak differential input is ?2 V, allowing sine wave operation at1 V rms with generous headroom. The output pins can drivesingle-sided loads essentially rail-to-rail. The differential outputresistance is 150 ?. The output swing is a linear function of thevoltage applied to the VMAG pin that internally defaults to 0.5 V,providing a peak output of ?2 V. This can be raised to 10 V p-p,limited by the supply voltage.The basic gain function is linear-in-dB, controlled by the voltageapplied to Pin VDBS. The gain ranges from 0 dB to 50 dB forcontrol voltages between 0 V and 1.5 V?a slope of 30 mV/dB.The gain linearity is typically within ?0.1 dB. By changing thelogic level on Pin MODE, the gain decreases over the same range,with an opposite slope. A second gain control port is providedat the VMAG pin and allows the user to vary the numeric gainfrom a factor of 0.03 to 10. All the parameters of the AD8330have low sensitivities to temperature and supply voltages. UsingVMAG, the basic 0 dB to 50 dB range can be repositioned toany value from 20 dB higher (that is, 20 dB to 70 dB) to at least30 dB lower (that is, ?30 dB to +20 dB) to suit the application,thereby providing an unprecedented gain range of over 100 dB.A unique aspect of the AD8330 is that its bandwidth and pulseresponse are essentially constant for all gains, over both thebasic 50 dB linear-in-dB range, but also when using the linearin-magnitudefunction. The exceptional stability of the HFresponse over the gain range is of particular value in those VGAapplications where it is essential to maintain accurate gain lawconformanceat high frequencies.An external capacitor at Pin OFST sets the high-pass corner ofan offset reduction loop, whose frequency can be as low as 5 Hz.When this pin is grounded, the signal path becomes dc-coupled.When used to drive an ADC, an external common-mode controlvoltage at Pin CNTR can be driven to within 0.5 V of either groundor VS to accommodate a wide variety of requirements. By default,the two outputs are positioned at the midpoint of the supply, VS/2.Other features, such as two levels of power-down (fully off anda hibernate mode), further extend the practical value of thisexceptionally versatile VGA.The AD8330 is available in 16-lead LFCSP and 16-lead QSOPpackages and is specified for operation from ?40?C to +85?C.Applications Pre-ADC signal conditioning 75 ? cable driving adjust AGC amplifiers

The AD8331 is a single channel, ultralow noise, linear-in-dB, variable gain amplifier (VGA). Optimized for ultrasound systems, it is usable as a low noise variable gain element at frequencies up to 120 MHz.Included is an ultralow noise preamplifier (LNA), an X-AMP? VGA with 48 dB of gain range, and a selectable gain postamplifier with adjustable output limiting. The LNA gain is 19 dB with a single-ended input and differential outputs. Using a single resistor, the LNA input impedance can be adjusted to match a signal source without compromising noise performance.The 48 dB gain range of the VGA makes these devices suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface provides precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V. Factory trim ensures excellent part-to-part and channel-to-channel gain matching. Differential signal paths result in superb second- and third-order distortion performance and low crosstalk.The operating temperature range is -40?C to +85?C. The AD8331 is available in a 20-lead QSOP package.The AD8331 is a single version of the dual AD8332 and quad AD8334.For information on specs, see the AD8331/AD8332/AD8334 datasheet.Applications Ultrasound and sonar time-gain controls High performance automatic gain control (AGC) systems I/Q signal processing High speed, dual ADC drivers

The AD8335 is a quad variable gain amplifier (VGA) with low noise preamplifier intended for cost and power sensitive applications. Each channel features a gain range of 48 dB, fully differential signal paths, active input preamplifier matching, and user-selectable maximum gains of 46 dB and 38 dB. Individual gain controls are provided for each channel.The preamplifier (PrA) has a single-ended to differential gain of ?8 (18.06 dB) and accepts input signals 625 mV p-p. PrA noise is 1.2 nV/?Hz and the combined input referred voltage noise of the PrA and VGA is 1.3 nV/?Hz at maximum gain.Assuming a 20 MHz noise bandwidth (NBW), the Nyquist frequency for a 40 MHz ADC, the input SNR is 92 dB. The HLxx pin optimizes the output SNR for 10-bit and 12-bit ADCs with 1 V p-p or 2 V p-p full-scale (FS) inputs.Channel 1 and Channel 2 are enabled through the EN12 pin and Channel 3 and Channel 4 are enabled through the EN34 pin. For VGA only applications, the PrAs can be powered down, significantly reducing power consumption.The AD8335 is available in a 64-lead lead frame chip scale package (9 mm ? 9 mm) for the industrial temperature range of ?40?C to +85?C.ApplicationsMedical imaging (ultrasound, gamma cameras)SonarTest and measurementPrecise, stable wideband gain controlData Sheet, Rev A, 08/2008

The AD8336 is a low noise, single-ended, linear in dB, general-purpose variable gain amplifier, usable over a large range of supply voltages. It features an uncommitted preamplifier with a usable gain range of 6 dB to 26 dB. The VGA gain range is 0 dB to 60 dB, with absolute gain limits of ?26 dB to +34 dB. When the preamplifier gain is adjusted for 12 dB, the combined 3 dB bandwidth of the preamplifier and VGA is 100 MHz, and the amplifier is fully usable to 80 MHz. With ?5 V supplies, the maximum output swing is 7 V p-p.Because of the X-AMP? architecture, frequency response is maintained across the entire gain range of the VGA. The differential gain control interface provides precise linear in dB gain scaling of 50 dB/V over the temperature span of ?55?C to +125?C and is simple to interface with a variety of external sources.The large supply voltage range makes the AD8336 suited for industrial medical applications and video circuits. Dual-supply operation enables bipolar input signals, such as those generated by photodiodes or photomultiplier tubes.The fully independent voltage feedback preamplifier allows both inverting and noninverting gain topologies. The AD8336 can be used within the specified gain range of ?14 dB to +60 dB by selecting a preamplifier gain between 6 dB and 26 dB and choosing appropriate feedback resistors. For the nominal preamplifier gain of 4?, the overall gain range is ?14 dB to +46 dB.If required, quiescent power is limited to a safe level by asserting the PWRA pin.APPLICATIONS Industrial process controls High performance AGC systems I/Q signal processing Video Industrial and medical ultrasound Radar receivers

The AD8346 is a silicon I/Q quadrature modulator, designed to be used from 800 MHz to 2.5 GHz. The part is optimized for lower power applications, yet provides a very low noise floor and high output power for the given supply current.The AD8346 requires only ?10 dBm LO drive level and provides a fully specified 50 ohm buffered output.The part provides excellent amplitude and phase balance and sideband suppression specifications to enable higher order/capacity QAM modulated radios.Additionally the AD8346 has been tested and provides ?72 dBc ACPR when used in a direct up-conversion CDMA IS95 modulator.The AD8346 is supplied in 16-lead Thin Shrunk Small Outline (TSSOP) package, and fully specified over ?40 to 85 degC temperature range.AVAILABILITYSamples part number (AD8346ARU) and an evaluation board, part number (AD8346-EVAL) are availableOTHER MODULATOR/DEMODULATOR PRODUCTSAD8345 - 250 MHz - 1 GHz RF/IF Quadrature ModulatorAD8347 - 800 MHz - 2.7 GHz RF/IF Quadrature DemodulatorAD8349 - 800 MHz - 2.7 GHz Direct Up-Conversion Quadrature Modulator

The AD8348 is a broadband quadrature demodulator with an integrated intermediate frequency (IF), variable gain amplifier (VGA), and integrated baseband amplifiers. It is suitable for use in communications receivers, performing quadrature demodulation from IF directly to baseband frequencies. The baseband amplifiers are designed to interface directly with dual-channel ADCs, such as the AD9201, AD9283, and AD9218, for digitizing and post-processing.The IF input signal is fed into two Gilbert cell mixers through an X-AMP? VGA. The IF VGA provides 44 dB of gain control. A precision gain control circuit sets a linear-in-decibel gain characteristic for the VGA and provides temperature compensation. The LO quadrature phase splitter employs a divide-by-2 frequency divider to achieve high quadrature accuracy and amplitude balance over the entire operating frequency range.The AD8348 is fabricated on an advanced bipolar process, operating on a single 3 or 5 volt supply, packaged in space saving 28 lead thin shrunk small outline (TSSOP) package and fully specified over the ?40 to +85 C temperature rangeSamples AD8348ARU and evaluation boards AD8348-EVAL are availableOTHER MODULATOR/DEMODULATOR PRODUCTSAD8345 250MHz ? 1GHz RF/IF Modulator AD8346 800MHz ? 2.5GHz Modulator AD8347 800MHz ? 2.7GHz Demodulator AD8349 700MHz ? 2.7GHz Modulator

The AD8353 is a broadband, fixed-gain, linear amplifier that operates at frequencies from 1 MHz up to 2.7 GHz. It is intended for use in a wide variety of wireless devices, including cellular, broadband, CATV, and LMDS/MMDS applications.By taking advantage of ADI?s high performance, complementary Si bipolar process, these gain blocks provide excellent stability over process, temperature, and power supply. This amplifier is single-ended and internally matched to 50 ? with a return loss of greater than 10 dB over the full operating frequency range.The AD8353 provides linear output power of 9 dBm with 20 dB of gain at 900 MHz when biased at 3 V and an external RF choke is connected between the power supply and the output pin. The dc supply current is 42 mA. At 900 MHz, the output third-order intercept (OIP3) is greater than 23 dBm and is 19 dBm at 2.7 GHz.The noise figure is 5.3 dB at 900 MHz. The reverse isolation (S12) is ?36 dB at 900 MHz and ?30 dB at 2.7 GHz.The AD8353 can also operate with a 5 V power supply; in which case, no external inductor is required. Under these conditions, the AD8353 delivers 8 dBm with 20 dB of gain at 900 MHz. The dc supply current is 42 mA. At 900 MHz, the OIP3 is greater than 22 dBm and is 19 dBm at 2.7 GHz. The noise figure is 5.6 dB at 900 MHz. The reverse isolation (S12) is ?35 dB.The AD8353 is fabricated on ADI?s proprietary, high performance, 25 GHz, Si complementary, bipolar IC process. The AD8353 is available in a chip scale package that uses an exposed paddle for excellent thermal impedance and low impedance electrical connection to ground. It operates over a ?40?C to +85?C temperature range, and an evaluation board is also available.Applications VCO buffers General Tx/Rx amplification Power amplifier predrivers Low power antenna drivers

The AD8436 is a new generation, translinear precision, lowpower, true rms-to-dc converter loaded with options. It computes a precise dc equivalent of the rms value of ac waveforms, includingcomplex patterns such as those generated by switch mode power supplies and triacs. Its accuracy spans a wide range of input levels and temperatures. The ensured accuracy of ??0.5% and ?10 ?V output offset result from the latest Analog Devices, Inc., technology. The crest factor error is 3 V extends the dynamic range with no external scaling,accommodating demanding low level signal conditions andallowing ample overrange without clipping.The AD8436 operates from single or dual supplies of ?2.4 V(4.8 V) to ?18 V (36 V). A and J grades are available in a compact 4 mm ? 4 mm, 20-lead chip-scale package; A and B grades areavailable in a 20-lead QSOP package. The operating temperatureranges are ?40?C to 125?C for A and B grades and 0?C to 70?Cfor J grade.