This Technical Note describes the evaluation board for the AD7719, Low Voltage, Low Power, 16&24- Bit, Dual Sigma Delta ADC.
The AD7719 is a complete analog front end for low frequency measurement applications.
The AD7719 is factory calibrated and therefore does not require field calibration.
The device can accept low level input signals directly from a transducer and produce a serial digital output.
It employs a sigma-delta conversion technique to realize up to 24 bits (Main ADC) or 16 bits (Auxiliary ADC) of no missing codes performance.
The selected input signal is applied to a proprietary programmable gain (Main ADC only) front end based around an analog modulator.
The modulator output is processed by an on-chip digital filter.
The first notch of this digital filter can be programmed via an on-chip control register allowing adjustment of the filter cutoff and output update rate.
Full data on the AD7719 is available in the AD7719 datasheet available from Analog Devices and should be consulted in conjunction with this Technical Note when using the evaluation board.
The evaluation board interfaces to the parallel port of an IBM compatible PC.
Software is available with the evalu- ation board which allows the user to easily program the AD7719.
Other components on the AD7719 Evaluation Board include two AD780s (precision 2.5V references), a 32.7680 kHz crystal and digital buffers to buffer signals to and from the PC.

Full-Featured Evaluation Board for the AD7719 On-Board Reference and Digital Buffers
Various Linking Options PC Software for Control of AD7719

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 The AD8215 is a high voltage, precision current shunt monitor.
It features a set gain of 20 V/V, with a maximum ±0.3% gain error over the entire temperature range.
The buffered output voltage directly interfaces with any typical converter.
Excellent common-mode rejection from −2 V to +65 V is independent of the 5 V supply.
The AD8215 performs unidirectional current measurements across a shunt resistor in a variety of industrial and automotive applications, such as motor controls, solenoid controls, or battery management.
Special circuitry is devoted to output linearity being maintained throughout the input differential voltage range of 0 mV to 250 mV, regardless of the common-mode voltage present.
The AD8215 has an operating temperature range of −40°C to +125°C and is offered in a small 8-lead SOIC_N package.

* ±4000 V HBM ESD
* High common-mode voltage range
- −2 V to +65 V operating
- −3 V to +68 V survival
* Buffered output voltage
* Wide operating temperature range
- 8-Lead SOIC_N: −40°C to +125°C
* Excellent ac and dc performance
- 6 μV/°C typical offset drift
- −8 ppm/°C typical gain drift
- 120 dB typical CMRR at dc

* High-side current sensing
* Motor controls
* Transmission controls
* Engine management
* Suspension controls
* Vehicle dynamic controls
* DC-to-dc converters


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Programmable capacitance-to-digital converter (CDC)
Femtofarad (fF) resolution 8 capacitance sensor inputs
25 ms update rate, all 8 sensor inputs
No external RC components required
Automatic conversion sequencer
On-chip automatic calibration logic
Automatic compensation for environmental changes
Automatic adaptive threshold and sensitivity levels
Register map compatible with AD7143
On-chip RAM to store calibration data
I2C-compatible serial interface Separate VDRIVE level for serial interface
Interrupt output
16-lead, 4 mm × 4 mm LFCSP
2.6 V to 3.3 V supply voltage
Low operating current
Full power mode: 1 mA Low power mode: 21.5 μA

Cell phones
Personal music and multimedia players
Smart handheld devices
Television, A/V, and remote controls
Gaming consoles
Digital still cameras

The AD7148 is designed for use with capacitance sensors imple- menting functions such as buttons, scroll bars, and wheels.
The sensors need only one PCB layer, enabling ultrathin applications. The AD7148 is an integrated capacitance-to-digital converter (CDC) with on-chip environmental calibration. The CDC has eight inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (Σ-Δ) converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. The external sensors can be arranged as a series of buttons, as a scroll bar or wheel, or as a combination of sensor types. By programming the registers, the user has full control over the CDC setup.
High resolution sensors require minimal software to run on the host processor.
The AD7148 is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor. For floating, or two, electrode sensors, use the AD7143.
The AD7148 has on-chip calibration logic to compensate for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals as long as the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment. The AD7148 has an I2C®-compatible serial interface, as well as an interrupt output. There is a VDRIVE pin to set the voltage level for the serial interface independent of VCC.
The AD7148 is available in a 16-lead, 4 mm × 4 mm LFCSP and operates from a 2.6 V to 3.6 V supply. The operating current consumption in low power mode is typically 26 μA.

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16-Bit Resolution and Monotonicity
Current Output Ranges: 4–20mA, 0–20mA or 0–24mA
0.1% typ Total Unadjusted Error (TUE)
5ppm/°C Output Drift
Voltage Output Ranges: 0-5V, 0-10V, ±5V, ±10V,
10% over-range
0.05% Total Unadjusted Error (TUE)
3ppm/°C Output Drift
Flexible Serial Digital Interface
On-Chip Output Fault Detection
On-Chip Reference (10 ppm/°C Max)
Asynchronous CLEAR Function
Power Supply Range
AVDD : 10.8V to 40 V
AVSS : -26.4V to -3V/0V
Output Loop Compliance to AVDD – 2.5 V
Temperature Range: -40°C to +85°C
TSSOP and LFCSP Packages

Process Control
Actuator Control

The AD5422 is a low-cost, precision, fully integrated 16-bit converter offering a programmable current source and programmable voltage output designed to meet the requirements of industrial process control applications.
The output current range is programmable to 4mA to 20 mA, 0mA to 20mA or an overrange function of 0mA to 24mA.
Voltage output is provided from a separate pin that can be configured to provide 0V to 5V, 0V to 10V, ±5V or ±10V output ranges, an over-range of 10% is available on all ranges.
Analog outputs are short and open circuit protected and can drive capacitive loads of 1uF and inductive loads of 1H.
The device is specified to operate with a power supply range from 10.8 V to 40 V. Output loop compliance is 0 V to AVDD – 2.5 V.
The flexible serial interface is SPI and MICROWIRE compatible and can be operated in 3-wire mode to minimize the digital isolation required in isolated applications.
The device also includes a power-on-reset function ensuring that the device powers up in a known state and an asynchronous CLEAR pin which sets the outputs to zero-scale / mid-scale voltage output or the low end of the selected current range.
The total output error is typically ±0.1% in current mode and ±0.05% in voltage mode.


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Complete dual, 16-bit digital-to-analog
converters (DACs)
Programmable output range: ±10 V, ±10.2564 V,
or ±10.5263 V
±1 LSB max INL error, ±1 LSB max DNL error
Low noise: 60 nV/√Hz
Settling time: 10 μs max
Integrated reference buffers
Internal reference: 10 ppm/°C
On-chip die temperature sensor
Output control during power-up/brownout
Programmable short-circuit protection
Simultaneous updating via LDAC
Asynchronous CLR to zero code
Digital offset and gain adjust
Logic output control pins
DSP-/microcontroller-compatible serial interface
Temperature range: −40°C to +85°C
iCMOS™ process technology1

Industrial automation
Open-/closed-loop servo control
Process control
Data acquisition systems
Automatic test equipment
Automotive test and measurement
High accuracy instrumentation

The AD5762R is a dual, 16-bit, serial input, bipolar voltage output digital-to-analog converter that operates from supply voltages of ±11.4 V up to ±16.5 V. Nominal full-scale output
range is ±10 V. The AD5762R provides integrated output amplifiers, reference buffers and proprietary power-up/powerdown control circuitry. The parts also feature a digital I/O port,
which is programmed via the serial interface and an analog temperature sensor. The part incorporates digital offset and gain adjust registers per channel.
The AD5762R is a high performance converter that offers guaranteed monotonicity, integral nonlinearity (INL) of ±1 LSB, low noise, and 10 μs settling time. The AD5762R includes an
on-chip 5 V reference with a reference tempco of 10 ppm/°C maximum. During power-up (when the supply voltages are changing), VOUT is clamped to 0 V via a low impedance path.
The AD5762R uses a serial interface that operates at clock rates of up to 30 MHz and is compatible with DSP and microcontroller interface standards. Double buffering allows
the simultaneous updating of all DACs. The input coding is programmable to either twos complement or offset binary formats. The asynchronous clear function clears all DAC
registers to either bipolar zero or zero scale depending on the coding used. The AD5762R is ideal for both closed-loop servo control and open-loop control applications. The AD5762R is
available in a 32-lead TQFP, and offers guaranteed specifications over the −40°C to +85°C industrial temperature range. See Figure 1, the functional block diagram.


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The AD9626 is a 12-bit monolithic sampling analog-to-digital converter optimized for high performance, low power, and ease of use. The product operates at up to a 250 MSPS conversion rate and is optimized for outstanding dynamic performance in wideband carrier and broadband systems. All necessary func-tions, including a track-and-hold (T/H) and voltage reference, are included on the chip to provide a complete signal conversion solution.
The ADC requires a 1.8 V analog voltage supply and a differen-tial clock for full performance operation. The digital outputs are CMOS compatible and support either twos complement, offset binary format, or Gray code. A data clock output is available for proper output data timing.
Fabricated on an advanced CMOS process, the AD9626 is available in a 56-lead LFCSP, specified over the industrial temperature range (−40°C to +85°C).

Wireless and wired broadband communications
Cable reverse path
Communications test equipment
Radar and satellite subsystems
Power amplifier linearization

1. High Performance—Maintains 64.9 dBFS SNR @ 250 MSPS with a 70 MHz input.
2. Low Power—Consumes only 364 mW @ 250 MSPS.
3. Ease of Use—CMOS output data and output clock signal allow interface to current FPGA technology. The on-chip reference and sample-and-hold provide flexibility in system design. Use of a single 1.8 V supply simplifies system power supply design.
4. Serial Port Control—Standard serial port interface supports various product functions, such as data formatting, clock duty cycle stabilizer, power-down, gain adjust, and output test pattern generation.
5. Pin-Compatible Family—10-bit pin-compatible family offered as the AD9601.


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Dual supervisory circuits
Supply voltage range of 2.7 V to 5.5 V
Pretrimmed threshold options: 1.8 V, 2.5 V, 3.3 V, and 5 V
Adjustable 0.6 V voltage reference
Maximum supply current of 40 μA
140 ms (minimum) reset timeout
Watchdog timer with 1.6 sec (typical) timeout
RESET valid from VDD ≥ 1.1 V
Push-pull RESET and RESET outputs
8-lead, narrow body SOIC package
Temperature range: −40°C to +85°C

Supervising DSPs/microcontrollers
Industrial and portable equipment
Wireless systems
Notebook/desktop computers

The ADM13305 is a dual voltage supervisor designed to monitor two supplies and provide a reset signal to DSP and microprocessor-based systems.
There are five models available, all of which feature a combination of internally pretrimmed undervoltage threshold options for monitoring 1.8 V, 2.5 V, 3.3 V, and 5 V supplies. There is also an adjustable input option with an undervoltage threshold voltage of 0.6 V.
The ADM13305-18, ADM13305-25, and ADM13305-33 models have two internally fixed thresholds. The ADM13305-4 and ADM13305-5 offer one internally fixed threshold and one externally programmable threshold via a resistor string. See the Ordering Guide for a list of all available options.
During power-up, RESET is asserted when the supply voltage exceeds 1.1 V. The device then monitors the SENSEv input pins and holds the RESET output low as long as either of the SENSEv inputs remains below the rising threshold voltage, VIT+.
Once the supplies monitored at the SENSEv inputs rise above their associated thresholds, the reset signal remains low for the reset timeout period before deasserting. Subsequently, if a voltage monitored by the SENSEv pins falls below its associ- ated falling threshold, VIT−, the RESET output asserts. The ADM13305 features both an active high RESET and an active low RESET output.
As well as providing power-on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within the preset timeout period. A reset signal can also be asserted by an external push button through the manual reset input pin.
The ADM13305 is available in an 8-lead, narrow body SOIC package. The device operates over the extended industrial temperature range of −40°C to +85°C.


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RF transceiver with integrated ADCs and DACs
IEEE 802.16 WiMAX
3.3 GHz to 3.8 GHz
3.5 MHz < BW < 20 MHz
Superior receiver sensitivity with NF 3.2 dB
Highly linear and spectrally pure transmitter Tx EVM: −36 dB SNR > 134 dB/Hz at fOFFSET > 22 MHz Tx power control
Range: 0 dB to 58 dB
Resolution: 0.25 dB
Autonomous AGC and Tx power control
Automatic frequency correction < 0.012 ppm
Integrated fractional-N synthesizer
8 Hz LO step size
Integrated phase noise < 0.8°rms

The AD9353 is a fully integrated transceiver for IEEE 802.16 WiMAX wireless network systems. The RF MxFE® combines the RF front end with mixed-signal baseband enabling an easy-
to-use digital interface to the baseband ASIC or FPGA. The AD9353 operates in the 3.3 GHz to 3.8 GHz range covering most of the licensed and unlicensed bands. Channel bandwidths of 3.5 MHz, 4.375 MHz, 5 MHz, 7 MHz, 8.75 MHz, 10 MHz, 14 MHz, 17.5 MHz, and 20 MHz are supported.
The direct-conversion receiver has state-of-the-art noise figure and linearity, and requires no external components with the exception of a balun. The complete RF subsystem integrates an autonomous AGC loop and dc offset corrections, thus eliminating the need for high speed interaction with the baseband processor. The received signal strength indicator
(RSSI) has over 80 dB of dynamic range with 0.5 dB resolution and is accessible via the serial interface.
The received signal is digitized with a high dynamic range 12-bit ADC. Decimation and channel filters produce a 10-bit output signal at the appropriate sample rate determined by the bandwidth mode. The transmit path takes 10-bit input data and interpolates before converting to the analog domain and upconverting to the carrier frequency.
The highly linear transmit path has excellent spectral purity with sideband noise less than −134 dBc/Hz at 22 MHz offset and offers EVM of −36 dB at 0 dBm output power. The transmit
power is detected by an accurate power detector and autono- mously controlled with a range of 58 dB and 0.25 dB steps.
The output power can be calibrated at the factory by a single measurement. The reference frequency is produced by an internal crystal oscillator that has a digital programmable   frequency with 0.012 ppm resolution, thus reducing the total bill of materials of the device. An internal auxiliary ADC and two auxiliary DACs are available for system monitoring and control. Three general- purpose I/Os are also included and can be register programmed or automatically sequenced by a user-defined state machine.
Mode control is via a 4-wire serial port and four real-time I/O control pins.
The AD9353 is powered from a single 3.3 V supply and contains on-chip LDOs for each  function to eliminate external regula- tors. The AD9353 is packaged in a 9 mm × 9 mm, 64-lead LFCSP.

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SNR = 74.5 dBc (75.5 dBFS) in a 32.7 MHz BW at 70 MHz @ 150 MSPS
SFDR = 80 dBc to 70 MHz @ 150 MSPS
1.8 V analog supply operation
1.8 V to 3.3 V CMOS output supply or 1.8 V LVDS output supply
Integer 1-to-8 input clock divider
Integrated dual-channel ADC
Sample rates up to 150 MSPS
IF sampling frequencies to 450 MHz
Internal ADC voltage reference
Integrated ADC sample-and-hold inputs
Flexible analog input range: 1 V p-p to 2 V p-p
ADC clock duty cycle stabilizer
95 dB channel isolation/crosstalk
Integrated wideband digital downconverter (DDC)
32-bit complex, numerically controlled oscillator (NCO)
Decimating half-band filter and FIR filter
Supports real and complex output modes
Fast attack/threshold detect bits
Composite signal monitor
Energy-saving power-down modes

Diversity radio systems
Multimode digital receivers (3G)
I/Q demodulation systems
Smart antenna systems
General-purpose software radios
Broadband data applications

1. Integrated dual, 14-bit, 150 MSPS ADC.
2. Integrated wideband decimation filter and 32-bit complex NCO.
3. Fast overrange detect and signal monitor with serial output.
4. Proprietary differential input maintains excellent SNR performance for input frequencies up to 450 MHz.
5. Flexible output modes, including independent CMOS, interleaved CMOS, IQ mode CMOS, and interleaved LVDS.
6. SYNC input allows synchronization of multiple devices.
7. 3-bit SPI port for register programming and register readback.
TAG Receiver

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Fully specified rail to rail at VCC = 2.5 V to 5.5 V
Input common-mode voltage from −0.2 V to VCC + 0.2 V
Low glitch CMOS-/TTL-compatible output stage
40 ns propagation delay
Low power 1 mW at 2.5 V
Shutdown pin
Programmable hysteresis
Power supply rejection > 60 dB
−40°C to +125°C operation

High speed instrumentation
Clock and data signal restoration
Logic level shifting or translation
High speed line receivers
Threshold detection
Peak and zero-crossing detectors
High speed trigger circuitry
Pulse-width modulators
Current-/voltage-controlled oscillators

The ADCMP609 is a fast comparator fabricated on XFCB2, an Analog Devices, Inc. proprietary process. These comparators are exceptionally versatile and easy to use. Features include an input range from VEE − 0.2 V to VCC + 0.2 V, low noise, TTL-/ CMOS-compatible output drivers, and adjustable hysteresis and/or shutdown inputs.
The device offers 40 ns propagation delay driving a 15 pF load with 10 mV overdrive on 500 μA typical supply current.
A flexible power supply scheme allows the devices to operate with a single +2.5 V positive supply and a −0.2 V to +3.0 V input signal range up to a +5.5 V positive supply with a −0.2 V to +5.7 V input signal range.
The TTL-/CMOS-compatible output stage is designed to drive up to 15 pF with full rated timing specifications and to degrade in a graceful and linear fashion as additional capacitance is added. The comparator’s input stage offers robust protection against large input overdrive, and the outputs do not phase reverse when the valid input signal range is exceeded. A programmable hysteresis features is also provided.
The ADCMP609, available in an 8-lead MSOP package, features shutdown pin and hysteresis control.


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