The AD7770 is an 8-channel, simultaneous sampling ADC. Eightfull sigma-delta (?-?) ADCs are on chip. The AD7770 providesa low input current to allow direct sensor connection. Each inputchannel has a programmable gain stage allowing gains of 1, 2, 4,and 8 to map lower amplitude sensor outputs into the full-scaleADC input range, maximizing the dynamic range of the signalchain. The AD7770 accepts a VREF voltage from 1 V up to 3.6 V.The analog inputs accept unipolar (0 V to VREF) or true bipolar(?VREF/2) analog input signals with 3.3 V or ?1.65 V analogsupply voltages, respectively for PGAGAIN = 1. The analog inputscan be configured to accept true differential, pseudo differential,or single-ended signals to match different sensor outputconfigurations.Each channel contains a PGA, an ADC modulator and asinc3, low latency digital filter. An SRC is provided to allow fineresolution control over the AD7770 ODR. This control can beused in applications where the ODR resolution is required tomaintain coherency with 0.01 Hz changes in the line frequency.The SRC is programmable through the serial port interface (SPI).The AD7770 implements two different interfaces: a data outputinterface and SPI control interface. The ADC data output interfaceis dedicated to transmitting the ADC conversion results fromthe AD7770 to the processor. The SPI writes to and reads fromthe AD7770 configuration registers and for the control andreading of data from the SAR ADC. The SPI can also beconfigured to output the ?-? conversion data.The AD7770 includes a 12-bit SAR ADC. This ADC can beused for AD7770 diagnostics without having to decommissionone of the ?-? ADC channels dedicated to system measurementfunctions. With the use of an external multiplexer, which can becontrolled through the three general-purpose input/output pins(GPIOs), and signal conditioning, the SAR ADC can validatethe ?-? ADC measurements in applications where functionalsafety is required. In addition, the AD7770 SAR ADC includesan internal multiplexer to sense internal nodes.The AD7770 contains a 2.5 V reference and reference buffer. Thereference has a typical temperature coefficient of 10 ppm/?C.The AD7770 offers two modes of operation: high resolution modeand low power mode. High resolution mode provides a higherdynamic range while consuming 10.75 mW per channel; lowpower mode consumes just 3.37 mW per channel at a reduceddynamic range specification.The specified operating temperature range is ?40?C to +105?C,although the device is operational up to +125?C.Applications Protection relays General-purpose data acquisition Industrial process control

The?AD7794/AD7795 are low power, low noise, complete analog front ends for high precision measurement applications. They contain a low noise, 24-/16-bit ?-? ADC with six differential inputs. The on-chip low noi se instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC.Each device contains a precision, low noise, low drift internal band gap reference, and can also accept up to two external differential references. Other on-chip features include programmable excitation current sources, burnout currents, and a bias voltage generator that is used to set the common-mode voltage of a channel to AVDD/2. The low-side power switch can be used to power down bridge sensors between conversions, minimizing the system?s power consumption. The AD7794/AD7795 can operate with either an internal clock or an external clock. The output data rate from each part can vary from 4.17 Hz to 470 Hz.Both parts operate with a power supply from 2.7 V to 5.25 V. The B-grade parts (AD7794 and AD7795) are specified for a temperature range of ?40?C to +105?C while the C-grade part (AD7794) is specified for a temperature range of ?40?C to +125?C. They consume a current of 400 ?A typical and are housed in a 24-lead TSSOP.Applications Temperature measurement Pressure measurement Weigh scales Strain gage transducers Gas analysis

The AD7798 /?AD7799 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7798 / AD7799 contains a low noise, 16-/24-bit ?-? ADC with three differential analog inputs. The on-chip, low noise instrumentation amplifier means that signals of small amplitude can be interfaced directly to the ADC. With a gain setting of 64, the rms noise is 27 nV for the AD7799 and 40 nV for the AD7798 when the update rate equals 4.17 Hz.On-chip features include a low-side power switch, reference detect, programmable digital output pins, burnout currents, and an internal clock oscillator. The output data rate from the part is software-programmable and can be varied from 4.17 Hz to 470 Hz.The part operates with a power supply from 2.7 V to 5.25 V. The AD7798 consumes a current of 300 ?A typical, whereas the AD7799 consumes 380 ?A typical. Both devices are housed in a 16-lead TSSOP package.APPLICATIONS Weigh scales Pressure measurement Strain gauge transducers Gas analysis Industrial process control Instrumentation Portable instrumentation Blood analysis Smart transmitters Liquid/gas chromotography 6-digit DVM

The AD7961 is a 16-bit, 5 MSPS charge redistribution successive approximation (SAR), analog-to-digital converter (ADC). The SAR architecture allows unmatched performance both in noiseand in linearity. The AD7961 contains a low power, high speed, 16-bit sampling ADC, an internal conversion clock and an internal reference buffer. On the CNV edge, the AD7961samples the voltage difference between the IN+ and IN? pins. The voltages on these pins swing in opposite phase between 0 V and 4.096 V/5 V. The reference voltage is applied to the partexternally. All conversion results are available on a single LVDS self-clocked or echo-clocked serial interface.The AD7961 is available in a 32-lead LFCSP (QFN) with operation specified from ?40?C to +85?C.APPLICATIONS Digital imaging systems ?Digital X-rays ?Computed tomography ?IR cameras MRI gradient control High speed data acquisition Spectroscopy Test equipment

The AD7980 is a 16-bit, successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD. It contains a low power, high speed, 16-bit sampling ADC and a versatile serial interface port. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN?. The reference voltage, REF, is applied externally and can be set independent of the supply voltage, VDD. Its power scales linearly with throughput.The SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single, 3-wire bus and provides an optional busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V, or 5 V logic, using the separate supply VIO.The AD7980 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from ?40?C to +125?C.APPLICATIONSAutomated test equipmentData acquisition systemsMedical instrumentsMachine automation

The AD7986 is an 18-bit, 2 MSPS successive approximation, analog-to-digital converter (ADC). It contains a low power,high speed, 18-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, the AD7986 samples the voltage difference between the IN+ andIN? pins. The voltages on these pins usually swing in opposite phases between 0 V and VREF. It features a very high samplingrate turbo mode (TURBO = high) and a reduced power normal mode (TURBO = low) for low power applications where thepower is scaled with the throughput.In normal mode (TURBO = low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisychainseveral ADCs on a single 3-wire bus and provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, and 2.7 V using theseparate VIO supply.The AD7986 is available in a 20-lead LFCSP with operationspecified from ?40?C to +85?C. Applications Battery-powered equipment Data acquisition systems Medical instruments Seismic data acquisition systems

The AD7992 is a 12-bit, low power, successive approximation ADC with an I2 C-compatible interface. The part operates from a single 2.7 V to 5.5 V power supply and features a 2 ?s conversion time. The part contains a 2-channel multiplexer and track-and-hold amplifier that can handle input frequencies up to 11 MHz. The AD7992 provides a 2-wire serial interface compatible with I2C interfaces. The part comes in two versions, the AD7992-0 and the AD7992-1, and each version allows for at least two different I2C addresses. The AD7992-0 supports standard and fast I2C interface modes, and the AD7992-1 supports standard, fast, and high speed I2C interface modes. The AD7992 normally remains in a shutdown state while not converting, and powers 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 AD7992 requires an external reference 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 conversion result violates the programmed high or low limits. This output can be used as an interrupt.PRODUCT HIGHLIGHTS 2 ?s conversion time and low power consumption. I2C-compatible serial interface with pin-selectable addresses. Two AD7992 versions allow five AD7992 devices to be connected to the same serial bus. The part features automatic shutdown while not converting to maximize power efficiency. Current consumption is 1 ?A max when in shutdown mode at 3 V. 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 store minimum and maximum conversion results.

The AD8452 combines a precision analog front-end controller and switch mode power supply (SMPS), pulse-width modulator (PWM) driver into a single silicon platform for high volume battery testing and formation manufacturing. A precision instrumentation amplifier (in-amp) measures the battery charge/discharge current, while an equally accurate difference amplifier measures the battery voltage. Internal laser trimmed resistor networks establish the in-amp and difference amplifier gains (66 V/V and 0.4 V/V, respectively), and stabilize the AD8452 performance across the rated operating temperature range.Desired battery cycling current and voltage levels are established by applying precise control voltages to the ISET and VSET inputs. Actual charge and discharge current levels are sensed (usually by a high power, highly accurate shunt resistor) whose value is carefully selected according to system parameters. Switching between constant current (CC) and constant voltage (CV) loop integration is instantaneous, automatic, and completely transparent to the observer. A logic high at the MODE input selects the charge or discharge mode (high for charge, low for discharge).The AD8452 simplifies designs by providing excellent performance, functionality, and overall reliability in a space saving 48-lead, 7 mm ? 7 mm ? 1.4 mm LQFP package rated for operation at temperatures from ?40?C to +85?C.Applications Battery formation and testing High efficiency battery test systems with recycle capability Battery conditioning (charging and discharging) systems

Demonstration circuit 2707B uses the LTC®4418 to arbitrate between two input supply rails, selecting the highest priority, valid supply to power the load. The V1 rail is defined to have higher priority and the V2 rail has lower priority. Both rails have individual overvoltage and undervoltage comparators for setting valid window thresholds with external resistive dividers. If the highest priority rail voltage V1 falls out of the defined window (overvoltage or undervoltage), the V2 rail, if it is valid, is enabled and powers the load. Two or more LTC4418s can be cascaded to provide switchover between more than two rails.

The LTC1772 is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772 when the input voltage falls below 2.0V.The LTC1772 provides a ?2.5% output voltage accuracy and consumes only 270?A of quiescent current. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode operation, which enhances efficiency at low output current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).In shutdown, the device draws a mere 8?A. High constant operating frequency of 550kHz allows the use of a small external inductor.The LTC1772 is available in a small footprint 6-lead SOT-23. Burst Mode LTC1772 Yes LTC1772B No Applications One or Two Lithium-Ion-Powered Applications Cellular Telephones Wireless Modems Portable Computers Distributed 3.3V, 2.5V or 1.8V Power Systems Scanners