Features and Benefits
- Download ADG798-KGD Data Sheet. Available as Known Good and fully guaranteed to data sheet specifications.
- Extreme high temperature operation
- Specified temperature range
- −55°C to +210°C (16-lead FLATPACK)
- −55°C to +175°C (16-lead TSSOP)
- 3.0 V to 5.5 V single supply
- ±2.5 V dual supply
- 10 Ω on resistance, maximum
- 2 Ω on resistance flatness, maximum
- 12 ns switching times
- Single 8:1 multiplexer
- Low power consumption
- TTL-/CMOS-compatible inputs
The ADG798 is a low voltage, CMOS, analog multiplexer designed to operate at very high temperatures up to 210°C. The ADG798 switches one of eight inputs (S1 to S8) to a common output, D, as determined by the 3-bit binary address lines A0, A1, and A2. An EN input on the device is used to enable or disable the device. When the device is disabled, all channels are switched off.
The ADG798 features low power consumption and a 3.3 V to 5.5 V operating supply range. All channels exhibit break-before-make switching action, preventing momentary shorting when switching channels. These switches are designed with an enhanced submicron process that provides low power dissipation, high switching speed and very low on resistance.
The on resistance (RON) is a maximum of 10 Ω and is closely matched between switches and very flat over the full signal range. The ADG798 operates equally well as either a multiplexer or a demultiplexer and has an input signal range that extends to the supplies.
This mux is available in a 16-lead ceramic flat package (FLATPACK) and a 16-lead ceramic flat package with reverse formed gullwing leads (FLATPACK_RF). Both of the flat packages have an operating temperature range of −55°C to +210°C. A 16-lead TSSOP package is also available that has an operating temperature range of −55°C to +175°C. All packages are designed for robustness at extreme temperatures, and are qualified for 1000 hours of continuous operation at the maximum temperature rating.
The ADG798 is a member of a growing series of high temperature qualified products offered by Analog Devices, Inc. For a complete selection table of available high temperature products, see the high temperature product list and qualification data available at http://www.analog.com/hightemp.
- Single-/Dual-Supply Operation.
The ADG798 is fully specified and guaranteed with 3.3 V and 5 V single-supply rails and ±2.5 V dual-supply rails.
- Low RON.
The RON of the ADG798 is specified at 5 Ω typical at 210°C.
- Low power consumption.
The power consumption of the ADG798 is specified at <0.01 μW.
- Guaranteed Break-Before-Make Switching Action.
- Downhole drilling and instrumentation
- Heavy industrial
- High temperature environments
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
The EVAL-ADG798EB1Z is the evaluation board for the ADG798 high temperature 8:1 multiplexer. The entire board assembly is constructed with high temperature compliant materials and is suitable for short duration device evaluation up to 210°C.
The ADG798 is soldered to the center of the evaluation board, and headers are provided to connect to each of the source and drain pins. A 4-pin header powers the device and provides a user defined digital logic supply voltage.
Full specifications on the ADG798 are available in the ADG798 data sheet, which should be consulted in conjunction with user guide UG-1039 when using the evaluation board.
EV-HT-200CDAQ1 builds on the CN0365 analog front end reference design from with the goal of providing a foundation for a high temperature, low power microcontroller-based data acquisition and control solution that meets the requirements for many downhole instrumentation and other high temperature applications. Based upon the AD7981 analog-to-digital SAR converter, this reference design demonstrates a full featured system with two high speed simultaneously sampled channels along with 8 additional multiplexed channels suitable for covering the acquisition requirements of a broad range of downhole tools (10 channels total). This analog front end is connected to the VORAGO Technologies VA10800 ARM® Cortex®-M0 based microcontroller via multiple SPI ports. Once acquired, the data can be processed locally or transmitted via a UART or optional RS485 communications interface. Other supporting components on the board, including memory, clock, power and passives are all rated for high temperature operation by their respective suppliers and verified to operate reliably at 200°C or higher. In addition to the hardware, open source firmware is supplied for the project using FreeRTOS with optimized drivers and data acqusition protocol with multiple modes of operation. Open source PC software included allows the users to connect to the board via UART to control acquisition modes, view data, log data and perform signal analysis. This platform is suitable for reference design, rapid prototyping (such as new sensor techniques) and lab testing of high temperature instrumentation systems.
Features & Benefits
- Complete high temperature data acquisition reference platform with all components and assembly materials rated to at least 200°C
- 10 channels of high precision analog to digital conversion
- (2) Direct channels, 400ksps max
- (8) Multiplexed channels, 16ksps max (including temp sensor)
- Multiple GPIO for external control and optional external triggering
- Complete software package including
- Optimized firmware with RTOS for multiple modes of data acquisition
- PC Host software for control, viewing and logging data
- Source code available for all software
- Form factor compatible with downhole oil/gas exploration instrumentation
- Kit includes analog and digital/power breakout boards for rapid evaluation
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.