The AD7730 is a complete analog front end for weigh-scale and pressure measurement applications. The device accepts low-level signals directly from a transducer and outputs a serial digital word. The input signal is applied to a proprietary programmable gain front end based around an analog modulator.The modulator output is processed by a low pass programmable digital filter, allowing adjustment of filter cutoff, output rate and settling time.The part features two buffered differential programmable gain analog inputs as well as a differential reference input. The part operates from a single +5 V supply. It accepts four unipolar analog input ranges: 0 mV to ±10 mV, +20 mV, +40 mV and +80 mV and four bipolar ranges: ±10 mV, ±20 mV, ±40 mV and ±80 mV. The peak-to-peak resolution achievable directly from the part is 1 in 230,000 counts. An on-chip 6-bit DAC allows the removal of TARE voltages. Clock signals for synchronizing ac excitation of the bridge are also provided.The serial interface on the part can be configured for three-wire operation and is compatible with microcontrollers and digital signal processors. The AD7730 contains self-calibration and system calibration options, and features an offset drift of less than 5 nV/°C and a gain drift of less than 2 ppm/°C.The part is available in a 24-pin plastic DIP, a 24-lead SOIC and 24-lead TSSOP package.APPLICATIONS Weigh Scales Pressure Measurement

The AD7731 is a complete analog front-end for process controlapplications. The device has a proprietary programmable gainfront end that allows it to accept a range of input signal ranges,including low level signals, directly from a transducer. The sigma-deltaarchitecture of the part consists of an analog modulatorand a low pass programmable digital filter, allowing adjustmentof filter cutoff, output rate and settling time.The part features three buffered differential programmable gainanalog inputs (which can be configured as five pseudo-differentialinputs), as well as a differential reference input. The part operatesfrom a single +5 V supply and accepts seven unipolar analoginput ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV,+320 mV, +640 mV and +1.28 V, and seven bipolar ranges:±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and±1.28 V. The peak-to-peak resolution achievable directly fromthe part is 16 bits at an 800 Hz output rate. The part can switchbetween channels with 1 ms settling time and maintain a performancelevel of 13 bits of peak-to-peak resolution.The serial interface on the part can be configured for three-wireoperation and is compatible with microcontrollers and digitalsignal processors. The AD7731 contains self-calibration andsystem calibration options and features an offset drift of lessthan 5 nV/°C and a gain drift of less than 2 ppm/°C.The part is available in a 24-lead plastic DIP, a 24-lead SOICand 24-lead TSSOP package.APPLICATIONS Process Control PLCs/DCS Industrial Instrumentation

The AD7731 is a complete analog front-end for process controlapplications. The device has a proprietary programmable gainfront end that allows it to accept a range of input signal ranges,including low level signals, directly from a transducer. The sigma-deltaarchitecture of the part consists of an analog modulatorand a low pass programmable digital filter, allowing adjustmentof filter cutoff, output rate and settling time.The part features three buffered differential programmable gainanalog inputs (which can be configured as five pseudo-differentialinputs), as well as a differential reference input. The part operatesfrom a single +5 V supply and accepts seven unipolar analoginput ranges: 0 to +20 mV, +40 mV, +80 mV, +160 mV,+320 mV, +640 mV and +1.28 V, and seven bipolar ranges:±20 mV, ±40 mV, ±80 mV, ±160 mV, ±320 mV, ±640 mV and±1.28 V. The peak-to-peak resolution achievable directly fromthe part is 16 bits at an 800 Hz output rate. The part can switchbetween channels with 1 ms settling time and maintain a performancelevel of 13 bits of peak-to-peak resolution.The serial interface on the part can be configured for three-wireoperation and is compatible with microcontrollers and digitalsignal processors. The AD7731 contains self-calibration andsystem calibration options and features an offset drift of lessthan 5 nV/°C and a gain drift of less than 2 ppm/°C.The part is available in a 24-lead plastic DIP, a 24-lead SOICand 24-lead TSSOP package.APPLICATIONS Process Control PLCs/DCS Industrial Instrumentation

The AD7788/AD7789 are low power, low noise, analog frontends for low frequency measurement applications. The AD7789contains a low noise, 24-bit, ∑-∆ analog-to-digital converter(ADC) with one differential input. The AD7788 is a 16-bitversion of the AD7789.The devices operate from an internal clock. Therefore, the userdoes not have to supply a clock source to the devices. The outputdata rate is 16.6 Hz, which gives simultaneous 50 Hz/60 Hzrejection.The devices operate with a single power supply from 2.5 V to5.25 V. When operating from a 3 V supply, the power dissipationfor the device is 225 µW maximum. The AD7788/AD7789 areavailable in a 10-lead MSOP.Applications Smart transmitters Battery applications Portable instrumentation Sensor measurement Temperature measurement Pressure measurement Weigh scales 4 to 20 mA loops

The AD7788/AD7789 are low power, low noise, analog frontends for low frequency measurement applications. The AD7789contains a low noise, 24-bit, ∑-∆ analog-to-digital converter(ADC) with one differential input. The AD7788 is a 16-bitversion of the AD7789.The devices operate from an internal clock. Therefore, the userdoes not have to supply a clock source to the devices. The outputdata rate is 16.6 Hz, which gives simultaneous 50 Hz/60 Hzrejection.The devices operate with a single power supply from 2.5 V to5.25 V. When operating from a 3 V supply, the power dissipationfor the device is 225 µW maximum. The AD7788/AD7789 areavailable in a 10-lead MSOP.Applications Smart transmitters Battery applications Portable instrumentation Sensor measurement Temperature measurement Pressure measurement Weigh scales 4 to 20 mA loops

The AD7810 is a high speed, low power, 10-bit A/D converter that operates from a single 2.7 V to 5.5 V supply. The part contains a 2 µs successive approximation A/D converter, with inherent track/hold functionality, a pseudo differential input and a high speed serial interface that interfaces to most microcontrollers. The AD7810 is fully specified over a temperature range of -40°C to +105°C.By using a technique that samples the state of the CONVST (convert start) signal at the end of a conversion, the AD7810 may be used in an automatic power-down mode. When used in this mode, the AD7810 automatically powers down at the end of a conversion and 'wakes up' at the start of a new conversion. This feature significantly reduces the power consumption of the part at lower throughput rates. The AD7810 can also operate in a high speed mode where the part is not powered down between conversions. In this high speed mode of operation, the conversion time of the AD7810 is 2 µs. The maximum throughput rate is dependent on the speed of the serial interface of the microcontroller. The part is available in a small 8-pin, 0.3' wide, plastic dual-in-line package (mini-DIP); in an 8-lead, small outline IC (SOIC); and in an 8-lead microSOIC package.PRODUCT HIGHLIGHTS Complete, 10-Bit ADC in 8-Lead Package The AD7810 is a 10-bit 2.3 µs ADC with inherent track/hold functionality and a high speed serial interface—all in an 8-lead microSOIC package. VREF may be connected to VDD to eliminate the need for an external reference. The result is a high speed, low power, space saving ADC solution. Low Power, Single Supply Operation The AD7810 operates from a single 2.7 V to 5.5 V supply and typically consumes only 9 mW of power while converting. The power dissipation can be significantly reduced at lower throughput rates by using the automatic power-down mode, e.g., at a throughput rate of 10 kSPS the power consumption is only 270 µW. Automatic Power-Down The automatic power-down mode, whereby the AD7810 powers down at the end of a conversion and “wakes up” before the next conversion, means the AD7810 is ideal for battery powered applications. See Power vs. Throughput Rate section. Serial Interface An easy to use, fast serial interface allows connection to most popular microprocessors with no external circuitry.APPLICATIONS Low Power, Hand-Held Portable Applications that Require Analog-to-Digital Conversion with 10-Bit Accuracy; e.g., Battery Powered Test Equipment, Battery-Powered Communications Systems

The AD7824 and AD7828 are high-speed, multichannel, 8-bit ADCs with a choice of 4 (AD7824) or 8 (AD7828) multiplexed analog inputs. A half-flash conversion technique gives a fast conversion rate of 2.5 µs per channel and the parts have a built-in track/hold function capable of digitizing full-scale signals of 10 kHz (157 mV/µs slew rate) on all channels. The AD7824 and AD7828 operate from a single +5 V supply and have an analog input range of 0 V to +5 V, using an external +5 V reference.Microprocessor interfacing of the parts is simple, using standard Chip Select (CS) and Read (RD) signals to initiate the conversion and read the data from the three-state data outputs. The half-flash conversion technique means that there is no need to generate a clock signal for the ADC. The AD7824 and AD7828 can be interfaced easily to most popular microprocessors.The AD7824 and AD7828 are fabricated in an advanced, all ion-implanted, Linear-Compatible CMOS process (LC2MOS) and have low power dissipation of 40 mW (typ). The AD7824 is available in a 0.3' wide, 24-pin 'skinny' DIP, while the AD7828 is available in a 0.6' wide, 28-pin DIP and in 28- terminal surface mount packages.

The AD7858 / AD7858L are high speed, low power, 12-bit ADCs that operate from a single 3 V or 5 V power supply, the AD7858 being optimized for speed and the AD7858L for low power. The ADC powers up witha set of default conditions at which time it can be operated as a read only ADC. The ADC contains self-calibration and system calibration options to ensure accurate operation over time and temperature and have a number of power-down options for low power applications. The part powers up with a set of default conditions and can operate as a read only ADC.The AD7858 is capable of 200 kHz throughput rate while the AD7858L is capable of 100 kHz throughput rate. The input track-and-hold acquires a signal in 500 ns and features a pseudo-differential sampling scheme. The AD7858/AD7858L voltage range is 0 to VREF with both straight binary and 2s complement output coding. Input signal range is to the supply and the part is capable of converting full power signals to 100 kHz.CMOS construction ensures low power dissipation of typically 5.4 mW for normal operation and 3.6 µW in power-down mode. The part is available in 24-pin, 0.3 inch-wide dual-in-line package (DIP), 24-lead small outline (SOIC) and 24-lead small shrink outline (SSOP) packages.APPLICATIONS Battery-Powered Systems (Personal Digital Assistants, Medical Instruments, Mobile Communications) Pen Computers Instrumentation and Control Systems High-Speed ModemsPRODUCT HIGHLIGHTS Specified for 3 V and 5 V supplies. Automatic calibration on power-up. Flexible power management options including automatic power-down after conversion. Operates with reference voltages from 1.2 V to VDD. 5. Analog input range from 0 V to VDD. Eight single-ended or four pseudo-differential input channels. System and self-calibration. Versatile serial I/O port (SPI/QSPI/8051/µP). Lower power version AD7858L.

The AD7862 is a high speed, low power, dual 12-bit A/D converter that operates from a single +5 V supply. The part contains two 4 µs successive approximation ADCs, two track/ hold amplifiers, an internal +2.5 V reference and a high speed parallel interface. There are four analog inputs that are grouped into two channels (A & B) selected by the A0 input. Each channel has two inputs (VA1 & VA2 or VB1 & VB2) that can be sampled and converted simultaneously thus preserving the relative phase information of the signals on both analog inputs. The part accepts an analog input range of ±10 V (AD7862-10), ±2.5 V (AD7862-3) and 0­2.5 V (AD7862-2). Overvoltage protection on the analog inputs for the part allows the input voltage to go to ±17 V, ±7 V or +7 V, respectively, without causing damage.A single conversion start signal (CONVST) places both track/ holds into hold simultaneously and initiates conversion on both inputs. The BUSY signal indicates the end of conversion, and at this time the conversion results for both channels are available to be read. The first read after a conversion accesses the result from VA1 or VB1, while the second read accesses the result from VA2 or VB2, depending on whether the multiplexer select A0 is low or high, respectively. Data is read from the part via a 12-bit parallel data bus with standard CS and RD signals.In addition to the traditional dc accuracy specifications such as linearity, full-scale and offset errors, the part is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.The AD7862 is fabricated in Analog Devices' Linear Compatible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. It is available in 28-lead SSOP, SOIC and DIP.APPLICATIONS AC Motor Control Uninterrupted Power Supplies Data Acquisition Systems CommunicationsPRODUCT HIGHLIGHTS The AD7862 features two complete ADC functions allowing simultaneous sampling and conversion of two channels. Each ADC has a 2-channel input mux. The conversion result for both channels is available 3.6 µs after initiating conversion. The AD7862 operates from a single +5 V supply and consumes 60 mW typ. The automatic power-down mode, where the part goes into power down once conversion is complete and “wakes up” before the next conversion cycle, makes the AD7862 ideal for battery-powered or portable applications. The part offers a high speed parallel interface for easy connection to microprocessors, microcontrollers and digital signal processors. The part is offered in three versions with different analog input ranges. The AD7862-10 offers the standard industrial input range of ±10 V; the AD7862-3 offers the common signal processing input range of ±2.5 V; while the AD7862-2 can be used in unipolar 0 V – +2.5 V applications. The part features very tight aperture delay matching between the two input sample-and-hold amplifiers.

The AD7864 is a high speed, low power, 4-channel, simulta-neous sampling 12-bit analog-to-digital converter (ADC) that operates from a single 5 V supply. The part contains a 1.65 μs successive approximation ADC, four track-and-hold amplifiers, a 2.5 V reference, an on-chip clock oscillator, signal conditioning circuitry, and a high speed parallel interface. The input signals on four channels sample simultaneously preserving the relative phase information of the signals on the four analog inputs. The part accepts analog input ranges of ±10 V, ±5 V (AD7864-1), 0 V to +2.5 V, 0 V to +5 V (AD7864-2), and ±2.5 V (AD7864-3).Any subset of the four channels can be converted to maximize the throughput rate on the selected sequence. Select the channels to convert via hardware (channel select input pins) or software (programming the channel select register).A single conversion start signal (CONVST) simultaneously places all the track-and-holds into hold and initiates a conversion sequence for the selected channels. The EOC signal indicates the end of each individual conversion in the selected conversion sequence. The BUSY signal indicates the end of the conversion sequence.Data is read from the part by a 12-bit parallel data bus using the standard CS and RD signals. Maximum throughput for a single channel is 500 kSPS. For all four channels, the maximum throughput is 130 kSPS for the read-during-conversion sequence operation. The throughput rate for the read-after-conversion sequence operation depends on the read cycle time of the processor. See the Timing and Control section. The AD7864 is available in a small (0.3 square inch area) 44-lead MQFP.