The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high performance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process.For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low supply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD621 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm°/C, 50 µV offset voltage and 0.6 mV/°C offset drift ('B' grade), make possible total system performance at a lower cost than has been previously achieved with discrete designs or with other monolithic instrumentation amplifiers.When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combination of low noise and low input bias currents. Voltage noise is specified as 9 nV/(root) Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/Hz. The AD621 outperforms FET input devices with an input bias current specification of 1.5 nA max over the full industrial temperature range.

The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high performance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process.For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low supply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD621 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm°/C, 50 µV offset voltage and 0.6 mV/°C offset drift ('B' grade), make possible total system performance at a lower cost than has been previously achieved with discrete designs or with other monolithic instrumentation amplifiers.When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combination of low noise and low input bias currents. Voltage noise is specified as 9 nV/(root) Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/Hz. The AD621 outperforms FET input devices with an input bias current specification of 1.5 nA max over the full industrial temperature range.

The AD621 is an easy to use, low cost, low power, high accuracy instrumentation amplifier which is ideally suited for a wide range of applications. Its unique combination of high performance, small size and low power, outperforms discrete in amp implementations. High functionality, low gain errors and low gain drift errors are achieved by the use of internal gain setting resistors. Fixed gains of 10 and 100 can be easily set via external pin strapping. The AD621 is fully specified as a total system, therefore, simplifying the design process.For portable or remote applications, where power dissipation, size and weight are critical, the AD621 features a very low supply current of 1.3 mA max and is packaged in a compact 8-pin SOIC, 8-pin plastic DIP or 8-pin cerdip. The AD621 also excels in applications requiring high total accuracy, such as precision data acquisition systems used in weigh scales and transducer interface circuits. Low maximum error specifications including nonlinearity of 10 ppm, gain drift of 5 ppm°/C, 50 µV offset voltage and 0.6 mV/°C offset drift ('B' grade), make possible total system performance at a lower cost than has been previously achieved with discrete designs or with other monolithic instrumentation amplifiers.When operating from high source impedances, as in ECG and blood pressure monitors, the AD621 features the ideal combination of low noise and low input bias currents. Voltage noise is specified as 9 nV/(root) Hz at 1 kHz and 0.28 µV p-p from 0.1 Hz to 10 Hz. Input current noise is also extremely low at 0.1 pA/Hz. The AD621 outperforms FET input devices with an input bias current specification of 1.5 nA max over the full industrial temperature range.

The AD6636 is a (Digital) Receive Signal Processor intended for direct IF sampling or highly sampled baseband radios requiring wide-bandwidth input signals. It has been optimized for the demanding filtering requirements of wideband standards like, CDMA2000, UMTS, and TD-SCDMA. The AD6636 is designed to be used as part of radio system that uses either an IF sampling ADC, or a baseband sampling ADC.The AD6636 has the following signal processing stages: a Frequency Translator, a 5th order Cascaded Integrated Comb filter, two sets of Cascaded Fixed Coefficient Finite Impulse Response (FIR) and Half Band filters, three cascaded programmable coefficient Sum of Product FIR filters, an Interpolating Half Band Filter (LHB) and a digital Automatic Gain Control (AGC) Block. Multiple modes are supported for clocking data into and out of the chip to provide flexibility for interfacing to a wide variety of digitizers. Programming and control is accomplished via serial or microport interfaces.The AD6636 features a fractional clock multiplier that uses the ADC clock to produce a digital down converter master clock up to 200 MHz. This internal phased-locked loop (PLL) allows optimum digital clock rates, regardless of the converter sampling rate, enabling the best possible digital signal decimation and filtering. Three 16-bit parallel output ports accommodate high data rate 3G applications. An on-chip interpolating half band filter can also be used to further increase the output rate while still allowing for very efficient filters. In addition, each channel has a digital AGC for output data scaling.

The AD674B and AD774B are complete 12-bit successive approximation analog-to-digital converters with three-state output buffer circuitry for direct interface to 8- and 16-bit microprocessor busses. A high precision voltage reference and clock are included on chip, and the circuit requires only power supplies and control signals for operation.The AD674B and AD774B are pin compatible with the industry standard AD574A, but offer faster conversion time and access speed than the AD574A and lower power consumption. The AD674B converts in 15 µs (maximum) and the AD774B converts in 8 µs (maximum).The monolithic design is implemented using Analog Devices' BiMOS II process allowing high performance bipolar analog circuitry to be combined on the same die with digital CMOS logic. Offset linearity and scaling errors are minimized by active trimming of thin-film resistors.Five different grades are available. The J and K grades are specified for operation over the 0°C to +70°C temperature range. A and B grades are specified from -40°C to +85°C, the T is specified from -55°C to +125°C. The J and K grades are available in a 28-pin plastic DIP or 28-lead SOIC. All other grades are available in a 28-pin hermetically sealed ceramic DIP.

The AD678 is a complete, multipurpose 12-bit monolithic analog-to-digital converter, consisting of a sample-hold amplifier (SHA), a microprocessor compatible bus interface, a voltage reference and clock generation circuitry.The AD678 is specified for ac (or 'dynamic') parameters such as S/N+D ratio, THD and IMD which are important in signal processing applications. In addition, the AD678K, B and T grades are fully specified for dc parameters which are important in measurement applications.The AD678 offers a choice of digital interface formats; the 12 data bits can be accessed by a 16-bit bus in a single read operation or by an 8-bit bus in two read operations (8+4), with right or left justification. Data format is straight binary for unipolar mode and twos complement binary for bipolar mode. The input has a full-scale range of 10 V with a full power bandwidth of 1 MHz and a full linear bandwidth of 500 kHz. High input impedance (10 MΩ) allows direct connection to unbuffered sources without signal degradation.This product is fabricated on Analog Devices' BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits; laser-trimmed thin-film resistors provide high accuracy. The converter utilizes a recursive subranging algorithm which includes error correction and flash converter circuitry to achieve high speed and resolution.The AD678 operates from +5 V and ±12 V supplies and dissipates 560 mW (typ). The AD678 is available in 28-pin plastic DIP, ceramic DIP, and 44 J-leaded ceramic surface mount packages.Screening to MIL-STD-883C Class B is also available.PRODUCT HIGHLIGHTS COMPLETE INTEGRATION: The AD678 minimizes external component requirements by combining a high speed sample-hold amplifier (SHA), ADC, 5 V reference, clock and digital interface on a single chip. This provides a fully specified sampling A/D function unattainable with discrete designs. SPECIFICATIONS: The AD678K, B and T grades provide fully specified and tested ac and dc parameters. The AD678J, A and S grades are specified and tested for ac parameters; dc accuracy specifications are shown as typicals. DC specifications (such as INL, gain and offset) are important in control and measurement applications. AC specifications (such as S/N+D ratio, THD and IMD) are of value in signal processing applications. EASE OF USE: The pinout is designed for easy board lay-out, and the choice of single or two read cycle output provides compatibility with 16- or 8-bit buses. Factory trimming eliminates the need for calibration modes or external trimming to achieve rated performance. RELIABILITY: The AD678 utilizes Analog Devices’ monolithic BiMOS technology. This ensures long-term reliability compared to multichip and hybrid designs. UPGRADE PATH: The AD678 provides the same pinout as the 14-bit, 128 kSPS AD679 ADC. The AD678 is available in versions compliant with MIL-STD-883. Refer to the Analog Devices Military Products Databook or current AD678/883B data sheet for detailed specifications.

The AD679 is a complete, multipurpose 14-bit monolithic analog-to-digital converter, consisting of a sample-hold amplifier (SHA), a microprocessor compatible bus interface, a voltage reference and clock generation circuitry.The AD679 is specified for ac (or 'dynamic') parameters such as S/N+D ratio, THD and IMD which are important in signal processing applications. In addition, the AD679K, B and T grades are fully specified for dc parameters which are important in measurement applications.The 14 data bits are accessed in two read operations (8+6), with left justification. Data format is straight binary for unipolar mode and twos complement binary for bipolar mode. The input has a full-scale range of 10 V with a full power bandwidth of 1 MHz and a full linear bandwidth of 500 kHz. High input impedance (10 M ohm) allows direct connection to unbuffered sources without signal degradation. Conversions can be initiated either under microprocessor control or by an external clock asynchronous to the system clock.This product is fabricated on Analog Devices' BiMOS process, combining low power CMOS logic with high precision, low noise bipolar circuits; laser-trimmed thin-film resistors provide high accuracy. The converter utilizes a recursive subranging algorithm which includes error correction and flash converter circuitry to achieve high speed and resolution.The AD679 operates from +5 V and ±12 V supplies and dissipates 560 mW (typ). The part is available in 28-lead plastic DIP, ceramic DIP, and 44 J-leaded ceramic surface-mount packages.PRODUCT HIGHLIGHTS COMPLETE INTEGRATION: The AD679 minimizes external component requirements by combining a high speed sample-and-hold amplifier (SHA), ADC, 5 V reference, clock, and digital interface on a single chip. This provides a fully specified sampling A/D function unattainable with discrete designs. SPECIFICATIONS: The AD679K, B, and T grades provide fully specified and tested ac and dc parameters. The AD679J, A, and S grades are specified and tested for ac parameters; dc accuracy specifications are shown as typicals. DC specifications (such as INL, gain, and offset) are important in control and measurement applications. AC specifications (such as S/N+D ratio, THD, and IMD) are of value in signal processing applications. EASE OF USE: The pinout is designed for easy board layout, and the two-read output provides compatibility with 8-bit buses. Factory trimming eliminates the need for calibration modes or external trimming to achieve rated performance. RELIABILITY: The AD679 utilizes Analog Devices’ monolithic BiMOS technology. This ensures long-term reliability compared to multichip and hybrid designs. UPGRADE PATH: The AD679 provides the same pinout as the 12-bit, 200 kSPS AD678 ADC. The AD679 is available in versions compliant with MILSTD-883. Refer to the Analog Devices Military Products Databook or current AD679/883B data sheet for detailed specifications.

The AD688 is a high precision ±10 V tracking reference. Low tracking error, low initial error and low temperature drift give the AD688 reference absolute ±10 V accuracy performance previously unavailable in monolithic form. The AD688 uses a proprietary ion-implanted buried Zener diode, and laser-wafer-drift- trimming of high stability thin-film resistors to provide outstanding performance at low cost.The AD688 includes the basic reference cell and three additional amplifiers. The amplifiers are laser-trimmed for low offset and low drift and maintain the accuracy of the reference. The amplifiers are configured to allow Kelvin connections to the load and/or boosters for driving long lines or high current loads, delivering the full accuracy of the AD688 where it is required in the application circuit.The low initial error allows the AD688 to be used as a system reference in precision measurement applications requiring 12-bit absolute accuracy. In such systems, the AD688 can provide a known voltage for system calibration and the cost of periodic recalibration can therefore be eliminated. Furthermore, the mechanical instability of a trimming potentiometer and the potential for improper calibration can be eliminated by using the AD688 and calibration software.The AD688 is available in three versions. The AD688AQ and BQ grades are packaged in 16-pin cerdip (0.3') packages and are specified for operation from -40°C to +85°C. The AD688SQ grade is specified for operation from -55°C to +125°C.PRODUCT HIGHLIGHTS Precision Tracking. The AD688 offers precision tracking ±10 V Kelvin output connections with no external components. Tracking error is less than 1.5 mV and fine-trim is available for applications requiring exact symmetry between the +10 V and −10 V outputs.  Accuracy. The AD688 offers 12-bit absolute accuracy without any user adjustments. Optional fine-trim connections are provided for applications requiring higher precision. The fine-trimming does not alter the operating conditions of the Zener or the buffer amplifiers and thus does not increase the temperature drift.  Low output noise. Output noise of the AD688 is low— typically 6 μVp-p. A pin is provided for broadband noise filtering using an external capacitor.

The AD7225 contains four 8-bit voltage output digital-to-analog converters, with output buffer amplifiers and interface logic on a single monolithic chip. Each D/A converter has a separate reference input terminal. No external trims are required to achieve full specified performance for the part.The double-buffered interface logic consists of two 8-bit registers per channel -an input register and a DAC register. Control inputs A0 and A1 determine which input register is loaded when WR goes low. Only the data held in the DAC registers determines the analog outputs of the converters. The double-buffering allows simultaneous update of all four outputs under control of LDAC. All logic inputs are TTL and CMOS (5V) level compatible and the control logic is speed compatible with most 8-bit microprocessors.Specified performance is guaranteed for input reference voltages from +2V to +12.5V when using dual supplies. The part is also specified for single supply operation using a reference of +10V. Each output buffer amplifier is capable of developing +10V across a 2 K(Ω) load.The AD7225 is fabricated on an all ion-implanted high speed Linear Compatible CMOS (LC2MOS) process which has been specifically developed to integrate high-speed digital logic circuits and precision analog circuitry on the same chip.PRODUCT HIGHLIGHTS DACs and Amplifiers on CMOS Chip. The single-chip design of four 8-bit DACs and amplifiers allows a dramatic reduction in board space requirements and offers increased reliability in systems using multiple converters. Its pinout is aimed at optimizing board layout with all analog inputs and outputs at one end of the package and all digital inputs at the other. Single- or Dual-Supply Operation. The voltage-mode configuration of the AD7225 allows single-supply operation. The part can also be operated with dual supplies, giving enhanced performance for some parameters. Versatile Interface Logic. The AD7225 has a common 8-bit data bus with individual DAC latches, providing a versatile control architecture for simple interface to microprocessors. The double-buffered interface allows simultaneous update of the four outputs. Separate Reference Input for Each DAC. The AD7225 offers great flexibility in dealing with input signals, with a separate reference input provided for each DAC and each reference having variable input voltage capability.

The AD7237A / AD7247A is an enhanced version of the industry standard AD7237 / AD7247. Improvements include operation from 12 V to 15 V supplies, faster interface times and better reference variations with VDD. Additional features include faster settling times.The AD7237A / AD7247A is a complete, dual, 12-bit, voltage output digital-to-analog converter with output amplifiers and Zener voltage reference on a monolithic CMOS chip. No external user trims are required to achieve full specified performance.Both parts are microprocessor compatible, with high speed data latches and interface logic. The AD7247A accepts 12-bit parallel data which is loaded into the respective DAC latch using the WR input and a separate Chip Select input for each DAC. The AD7237A has a double buffered interface structure and an 8-bit wide data bus with data loaded to the respective input latch in two write operations. An asynchronous LDAC signal on the AD7237A updates the DAC latches and analog outputs.A REF OUT/REF IN function is provided which allows either the on-chip 5 V reference or an external reference to be used as a reference voltage for the part. For single supply operation, two output ranges of 0 V to +5 V and 0 V to +10 V are available, while these two ranges plus an additional ±5 V range are available with dual supplies. The output amplifiers are capable of developing +10 V across a 2 kΩ load to GND.The AD7237A / AD7247A is fabricated in Linear Compatible CMOS (LC2MOS), an advanced, mixed technology process that combines precision bipolar circuits with low power CMOS logic. Both parts are available in a 24-pin, 0.3' wide plastic and hermetic dual-in-line package (DIP) and are also packaged in a 24-lead small outline (SOIC) package.