The ADRF6520 is a matched pair of fully differential low noise and low distortion programmable filters and variable gain amplifiers(VGAs). Each channel is capable of rejecting large, out of band interferers while reliably boosting the wanted signal, thus reducingthe bandwidth and resolution requirements on the analog-to-digital converters (ADCs). The excellent matching betweenchannels and their high spurious-free dynamic range over all gain and bandwidth settings make the ADRF6520 ideal forquadrature-based (IQ) communication systems with dense constellations, multiple carriers, and nearby interferers. Thefilter corners, enable, and dc offset correction loop enable are all programmable via a serial peripheral interface (SPI).The first VGA that precedes the filters offers 30 dB of continuous gain control with a maximum gain of 18 dB and sets a differentialinput impedance of 100 ?. The filters provide a four-pole Butterworth response with ?1 dB corner frequencies: 36 MHz,72 MHz, 144 MHz, 288 MHz, 432 MHz, 576 MHz, and 720 MHz. For operation beyond 720 MHz, the filter can be disabled andcompletely bypassed, thereby extending the ?1 dB bandwidth up to 1.25 GHz. A wideband rms detector is available tomonitor the signal at the filter inputs. A fixed gain amplifier of 6 dB immediately follows the filter. The postfilter VGA provides30 dB of continuous gain control with a maximum gain of 12 dB. The output buffers offer an additional 18 dB of gain andprovide a differential output impedance of 20 ?. The output buffers are capable of driving 1.5 V p-p into 100 ? loads at betterthan 55 dBc nominal for the third-order intermodulation distortion (IMD3). Independent, built in, dc offset correctionloops for each channel can be disabled via the SPI if fully dc-coupled operation is desired. The high-pass corner frequency isdetermined by external capacitors on the CHP1 and CHP2 pins and the postfilter VGA gain.The ADRF6520 operates from a 3.15 V to 3.45 V supply and consumes a maximum supply current of 425 mA. When fullydisabled, it consumes ?10 mA. The ADRF6520 is fabricated in an advanced silicon-germanium BiCMOS process and isavailable in a 32-lead, exposed pad LFCSP. Performance is specified over the ?40?C to +85?C temperature range.Applications Point-to-point and point-to-multipoint radios Baseband IQ receivers Diversity receivers ADC drivers Instrumentation Medical

The ADRF6850 is a highly integrated broadband quadrature demodulator, frequency synthesizer, and variable gain amplifier (VGA). The device covers an operating frequency range from 100 MHz to 1000 MHz for use in both narrow-band and wideband communications applications, performing quadrature demodulation from IF directly to baseband frequencies.The ADRF6850 demodulator includes a high modulus fractional-N frequency synthesizer with integrated VCO, providing better than 1 Hz frequency resolution, and a 60 dB gain control range provided by a front-end VGA.Control of all the on-chip registers is through a user-selected SPI interface or I2C interface. The device operates from a single power supply ranging from 3.15 V to 3.45 V.APPLICATIONS Broadband communications Cellular communications Satellite communications

The AD9957 functions as a universal I/Q modulator and agileupconverter for communications systems where cost, size, powerconsumption, and dynamic performance are critical. TheAD9957 integrates a high speed, direct digital synthesizer(DDS), a high performance, high speed, 14-bit digital-to-analogconverter (DAC), clock multiplier circuitry, digital filters, andother DSP functions onto a single chip. It provides basebandupconversion for data transmission in a wired or wirelesscommunications system.The AD9957 is the third offering in a family of quadraturedigital upconverters (QDUCs) that includes the AD9857 andAD9856. It offers performance gains in operating speed, powerconsumption, and spectral performance. Unlike its predecessors,it supports a 16-bit serial input mode for I/Q baseband data.The device can alternatively be programmed to operate either asa single tone, sinusoidal source or as an interpolating DAC.The reference clock input circuitry includes a crystal oscillator,a high speed, divide-by-two input, and a low noise PLL formultiplication of the reference clock frequency.The user interface to the control functions includes a serial porteasily configured to interface to the SPORT of the Blackfin?DSP and profile pins to enable fast and easy shift keying of anysignal parameter (phase, frequency, or amplitude).Applications HFC data, telephony, and video modems Wireless base station transmissions Broadband communications transmissions Internet telephony

The AD9961/AD9963 are pin-compatible, 10-/12-bit, lowpower MxFE? converters that provide two ADC channels withsample rates of 100 MSPS and two DAC channels with samplerates to 170 MSPS. These converters are optimized for transmit and receive signal paths of communication systems requiring lowpower and low cost. The digital interfaces provide flexibleclocking options. The transmit is configurable for 1?, 2?, 4?, and 8? interpolation. The receive path has a bypassable 2? decimating low-pass filter.The AD9961 and AD9963 have five auxiliary analog channels.Three are inputs to a 12-bit ADC. Two of these inputs can beconfigured as outputs by enabling 10-bit DACs. The other two channels are dedicated outputs from two independent 12-bit DACs.The high level of integrated functionality, small size, and lowpower dissipation of the AD9961/AD9963 make them well-suited for portable and low power applications.APPLICATIONS Wireless infrastructure Picocell, femtocell basestations Medical instrumentation Ultrasound AFE Portable instrumentation Signal generators, signal analyzers

The ADA2200 is a synchronous demodulator and configurable analog filter designed to perform precision magnitude and phase measurements in low power, sensor signal conditioning and data acquisition applications for the industrial, medical, and communications markets. Implemented with ADI?s patent pending sampled analog technology (SAT), the ADA2200 is an analog input, sampled analog output device that includes an analog domain, low-pass 1/8x decimation finite impulse response (FIR) filter, a configurable infinite impulse response (IIR) filter, mixer with 0?/90? phase selection, reference clock and ADC driver output. Utilizing sampled analog technology, the signal processing is performed entirely in the analog domain by charge sharing among capacitors, which eliminates the effects of quantization noise and rounding errors and reduces downstream ADC sample rates while also offloading computationally heavy tasks from the digital processor or micro-controller.The ADA2200 acts as a precision filter when the demodulation function is disabled. The filter has a programmable bandwidth and tunable center frequency. The filter characteristics are highly stable over temperature, supply, and process variation.Single-ended and differential signal interfaces are possible on both input and output terminals, simplifying the connection to other components of the signal chain. The low power consumption and rail-to-rail operation is ideal for battery-powered and low voltage systems.The ADA2200 can be programmed over its SPI-compatible serial port or can automatically boot from the EEPROM through its I2C interface. On-chip clock generation produces a mixing signal with a programmable frequency and phase. In addition, the ADA2200 synchronization output signal eases interfacing to other sampled systems, such as data converters and multiplexers.The ADA2200 is available in a 16-lead TSSOP package. Its performance is specified over the industrial temperature range of ?40?C to +85?C. Note that throughout this data sheet, multifunction pins, such as SCLK/SCL, are referred to either by the entire pin name or by a single function of the pin, for example, SCLK, when only that function is relevant.Applications Synchronous demodulation Sensor signal conditioning Lock-in amplifiers Phase detectors Precision tunable Filters Signal recovery Control systems

The ADA4254 is a zero drift, high voltage, low power?programmable gain instrumentation amplifier (PGIA) designed?for process control and industrial applications. The ADA4254?features 12 binary weighted gains ranging from 1/16 V/V to?128 V/V and three scaling gain options of 1 V/V, 1.25 V/V, and?1.375 V/V, resulting in 36 possible gain settings. The power?consumption of the ADA4254 is a mere 22 mW, making the?device an excellent choice for industrial systems that demand?precision, robustness, and low power.The zero drift amplifier topology of the ADA4254 self calibrates dc errors and low frequency 1/f noise, achieving excellent dc precision over the entire specified temperature range. This high level of precision maximizes dynamic range and greatly reduces calibration requirements in many applications.?The input multiplexer provides ?60 V protection to the high impedance inputs of the amplifier, while providing the capability to switch between two input sources. In addition, integrated electromagnetic interference (EMI) filters block harsh RF noise from the sensitive inputs of the amplifier.?Various safety features on the ADA4254 detect both internal and external faults. The serial port interface (SPI) supports cyclical redundancy check (CRC) error detection to ensure robust communication. These safety features ease system safety integrity level (SIL) certification.?Seven general-purpose input/output (GPIO) pins, which can be configured to provide various special functions, are included in the ADA4254. An excitation current source output is available to bias sensors such as resistance temperature detectors (RTDs).?The ADA4254 is specified over the ?40?C to +105?C temperature range and is offered in a compact 5 mm ? 5 mm, 28-lead LFCSP and a 24-lead TSSOP.?Applications Universal process control front ends Data acquisition systems Test and measurement systems?

The ADA4255 is a precision programmable gain instrumentation amplifier (PGIA) with integrated bipolar charge pumps. With its integrated charge pumps, the ADA4255 internally produces the high voltage bipolar supplies needed to achieve a wide input voltage range (38 V typical with VDDCP = 5 V) without lowering input impedance. The charge pump topology of the ADA4255 allows channels to be isolated with only low voltage components, reducing complexity, size, and implementation time in industrial and process control systems.The zero drift PGIA topology of the ADA4255 self calibrates dc errors and lower frequency 1/f noise, achieving excellent dc precision over the entire specified temperature range. The combination of 36 precision gains ranging from 1/16 V/V to 176 V/V within the ADA4255 and high voltage, high impedance inputs allow a wide range of inputs to be scaled to the range of the analog-to-digital converter (ADC). By integrating all gain setting and level shifting resistors, the ADA4255 achieves excellent common-mode rejection ratio (CMRR) performance (111 dB minimum at G = 1 V/V) and extremely low gain drift (?1 ppm/?C maximum). This high level of precision maximizes dynamic range and greatly reduces calibration requirements in many applications.The ?60 V input protection, integrated electromagnetic interference (EMI) filtering and various safety features make the ADA4255 an ideal choice for robust industrial systems. Seven general-purpose input and output (GPIOx) pins, which can be configured to provide various special functions, are included in the ADA4255. An excitation current source output is available to bias sensors such as resistance temperature detectors (RTDs).The ADA4255 is specified over the ?40?C to +105?C temperature range and is offered in a compact 5 mm ? 5 mm, 28-lead LFCSP.APPLICATIONSUniversal process control front endsData acquisition systemsTest and measurement systemsSystem power monitoring

The AD7985 is a 16-bit, 2.5 MSPS successive approximationanalog-to-digital converter (SAR ADC). It contains a low power,high speed, 16-bit sampling ADC, an internal conversion clock,an internal reference (and buffer), error correction circuits, anda versatile serial interface port. On the rising edge of CNV, theAD7985 samples an analog input, IN+, between 0 V and REFwith respect to a ground sense, IN?. The AD7985 features avery high sampling rate turbo mode (TURBO is high) and areduced power normal mode (TURBO is low) for low powerapplications where the power is scaled with the throughput.In normal mode (TURBO is low), the SPI-compatible serial interfacealso features the ability, using the SDI input, to daisy-chainseveral ADCs on a single 3-wire bus and provide an optional busyindicator. It is compatible with 1.8 V, 2.5 V, and 2.7 V suppliesusing the separate VIO supply.The AD7985 is available in a 20-lead LFCSP with operationspecified from ?40?C to +85?C.Applications Battery-powered equipment Communications ATE Data acquisition systems Medical instruments

The AD7994 is a 4-channel, 10- and 12-bit, low power, successive approximation ADCs with an I2C-compatible interface. The parts operate from a single 2.7 V to 5.5 V power supply and feature a 2 ?s conversion time. The parts contain a 4-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz.The AD7994 provides a two-wire serial interface which is compatible with I2C interfaces. The part comes in two versions, AD7994-0 and AD7994-1. Each version allows for a minimum of two different I2C addresses. The I2C interface on the AD7994-0 supports Standard and Fast I2C Interface Modes. The I2C interface on the AD7994-1 supports Standard, Fast and two High-Speed I2C Interface Modes.The AD7994 normally remain in a shutdown state while not converting, and power up only for conversions. The conversion process can be controlled using the CONVST pin, by a command mode where conversions occur across I2C write operations, or an automatic conversion interval mode selected through software control.?The AD7994 require an external reference that should be applied to the REFIN pin and can be in the range of 1.2 V to VDD. This allows the widest dynamic input range to the ADC.?On-chip limit registers can be programmed with high and low limits for the conversion result, and an open-drain, out-of-range indicator output (ALERT) becomes active when the programmed high or low limits are violated by the conversion result. This output can be used as an interrupt.PRODUCT HIGHLIGHTS 2 ?s conversion time with low power consumption. I2C-compatible serial interface with pin-selectable addresses. Two AD7993?/ AD7994 versions allow five AD7993 / AD7994 devices to be connected to the same serial bus. The parts feature automatic shutdown while not converting to maximize power efficiency. Current consumption is 1 ?A max when in shutdown mode. Reference can be driven up to the power supply. Out-of-range indicator that can be software disabled or enabled. One-shot and automatic conversion rates. Registers can store minimum and maximum conversion results.

The EVAL-AD8302-ARDZ shield illustrates the functionality of the AD8302, a gain and phase detector which operates from low frequency up to 2.7 GHz. The voltage outputs of the AD8302 are routed to the ANALOG IN connector of the Arduino base board. This allows the RF power detector’s output voltage to be easily digitized and processed by the Arduino base board’s integrated six-channel ADC.