AD7890
PRODUCTIONLC2MOS 8-Channel, 12-Bit Serial Data Acquisition System
- Part Models
- 17
- 1ku List Price
- Starting From $19.27
Part Details
- Fast 12-bit ADC with 5.9 µs conversion time
- Eight single-ended analog input channels
- Selection of input ranges:
±10 V for AD7890-10
0 V to 4.096 V for AD7890-4
0 V to 2.5 V for AD7890-2 - Allows separate access to multiplexer and ADC
- On-chip track/hold amplifier
- On-chip reference
- High-speed, flexible, serial interface
- Single supply, low-power operation (50 mW max)
- Power-down mode (75 µW typ)
The AD7890 is an 8-channel 12-bit data acquisition system. The part contains an input multiplexer, an on-chip track/hold amplifier, a high speed 12-bit ADC, a 2.5 V reference, and a high speed, serial interface. The part operates from a single 5 V supply and accepts an analog input range of ±10 V (AD7890-10), 0 V to 4.096 V (AD7890-4), and 0 V to 2.5 V (AD7890-2).
The multiplexer on the part is independently accessible. This allows the user to insert an antialiasing filter or signal conditioning, if required, between the multiplexer and the ADC. This means that one antialiasing filter can be used for all eight channels. Connection of an external capacitor allows the user to adjust the time given to the multiplexer settling to include any external delays in the filter or signal conditioning circuitry.
Output data from the AD7890 is provided via a high speed bidirectional serial interface port. The part contains an on-chip control register, allowing control of channel selection, conversion start, and power-down via the serial port. Versatile, high speed logic ensures easy interfacing to serial ports on microcontrollers and digital signal processors.
In addition to the traditional dc accuracy specifications such as linearity, full-scale, and offset errors, the AD7890 is also specified for dynamic performance parameters including harmonic distortion and signal-to-noise ratio.
Power dissipation in normal mode is low at 30 mW typical and the part can be placed in a standby (power-down) mode if it is not required to perform conversions. The AD7890 is fabricated in Analog Devices, Inc.'s Linear Compatible CMOS (LC2MOS) process, a mixed technology process that combines precision bipolar circuits with low power CMOS logic. The part is available in a 24-lead, 0.3" wide, plastic or ceramic dual-in-line package or in a 24-lead small outline package (SOIC_W).
PRODUCT HIGHLIGHTS
- Complete 12-Bit Data Acquisition System-on-a-Chip. The AD7890 is a complete monolithic ADC combining an 8-channel multiplexer, 12-bit ADC, 2.5 V reference, and a track/hold amplifier on a single chip.
- Separate Access to Multiplexer and ADC. The AD7890 provides access to the output of the multiplexer allowing one antialiasing filter for 8 channels—a considerable savings over the 8 antialiasing filters required if the multiplexer is internally connected to the ADC.
- High Speed Serial Interface. The part provides a high speed serial interface for easy connection to serial ports of microcontrollers and DSP processors.
Documentation
Data Sheet 2
Application Note 1
Technical Articles 1
Product Highlight 1
Product Highlight 1
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. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7890ANZ-10 | 24-Lead PDIP | ||
| AD7890ANZ-4 | 24-Lead PDIP | ||
| AD7890ARZ-10 | 24-Lead SOIC (Wide) | ||
| AD7890ARZ-10REEL | 24-Lead SOIC (Wide) | ||
| AD7890ARZ-2 | 24-Lead SOIC (Wide) | ||
| AD7890ARZ-2REEL | 24-Lead SOIC (Wide) | ||
| AD7890ARZ-4 | 24-Lead SOIC (Wide) | ||
| AD7890ARZ-4REEL | 24-Lead SOIC (Wide) | ||
| AD7890BNZ-2 | 24-Lead PDIP | ||
| AD7890BRZ-10 | 24-Lead SOIC (Wide) | ||
| AD7890BRZ-10REEL | 24-Lead SOIC (Wide) | ||
| AD7890BRZ-2 | 24-Lead SOIC (Wide) | ||
| AD7890BRZ-2REEL | 24-Lead SOIC (Wide) | ||
| AD7890BRZ-4REEL | 24-Lead SOIC (Wide) | ||
| AD7890SQ-10 | 24-Lead CerDIP (Narrow 0.3 Inch) | ||
| AD7890SQ-2 | 24-Lead CerDIP (Narrow 0.3 Inch) | ||
| AD7890SQ-4 | 24-Lead CerDIP (Narrow 0.3 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Mar 7, 2019 - 19_0046 Assembly Transfer of 18,20,24,28 Lead PDIP to Cirtek |
||
| AD7890ANZ-10 | PRODUCTION | |
| AD7890ANZ-4 | PRODUCTION | |
| AD7890BNZ-2 | PRODUCTION | |
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
||
| AD7890ANZ-10 | PRODUCTION | |
| AD7890ANZ-4 | PRODUCTION | |
| AD7890BNZ-2 | PRODUCTION | |
|
Aug 4, 2010 - 10_0117 Halogen Free Material Change for SOIC_W Products at Carsem |
||
| AD7890ARZ-10 | PRODUCTION | |
| AD7890ARZ-10REEL | PRODUCTION | |
| AD7890ARZ-2 | PRODUCTION | |
| AD7890ARZ-2REEL | PRODUCTION | |
| AD7890ARZ-4 | PRODUCTION | |
| AD7890ARZ-4REEL | PRODUCTION | |
| AD7890BRZ-10 | PRODUCTION | |
| AD7890BRZ-10REEL | PRODUCTION | |
| AD7890BRZ-2 | PRODUCTION | |
| AD7890BRZ-2REEL | PRODUCTION | |
| AD7890BRZ-4REEL | PRODUCTION | |
|
Nov 7, 2012 - 12_0199 Qualification of New Conductive Silver-Filled Glass Die Attach Adhesive for Cerdip and Ceramic Flatpack (Cerpack) Packages. |
||
| AD7890SQ-10 | ||
| AD7890SQ-2 | ||
| AD7890SQ-4 | ||
|
Nov 9, 2011 - 11_0050 Transfer of ADI Hermetics Assembly location from Paranaque, Manila to General Trias, Cavite Philippines |
||
| AD7890SQ-10 | ||
| AD7890SQ-2 | ||
| AD7890SQ-4 | ||
|
Nov 9, 2011 - 11_0182 Test Site Transfer from Analog Devices Philippines Inc in Paranaque to Analog Devices General Trias in Cavite, Philippines |
||
| AD7890SQ-10 | ||
| AD7890SQ-2 | ||
| AD7890SQ-4 | ||
This is the most up-to-date revision of the Data Sheet.