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Features
- Throughput rate: 1.5 MSPS
- Specified for VDD of 2.7 V to 5.25 V
- 8 analog input channels with a sequencer
- Software-configurable analog inputs
- 8-channel single-ended inputs
- 4-channel fully differential inputs
- 4-channel pseudo differential inputs
- 7-channel pseudo differential inputs
- Accurate on-chip 2.5 V reference
- ±0.2% maximum at 25°C, 25 ppm/°C maximum
- Power consumption
- 6 mW maximum at 1.5 MSPS with 3 V supplies
- 13.5 mW maximum at 1.5 MSPS with 5 V supplies
- 69 dB SINAD at 50 kHz input frequency
- No pipeline delays
- High speed parallel interface—word/byte modes
- Full shutdown mode: 2 μA maximum
- 32-lead LFCSP and TQFP packages
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The AD7938/AD7939 are 12-bit and 10-bit, high speed, low power, successive approximation (SAR) analog-to-digital converters (ADCs). The parts operate from a single 2.7 V to 5.25 V power supply and feature throughput rates up to 1.5 MSPS. The parts contain a low noise, wide bandwidth, differential track-and-hold amplifier that can handle input frequencies up to 50 MHz.
The AD7938/AD7939 feature eight analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. These parts can operate with either single-ended, fully differential, or pseudo differential analog inputs.
The conversion process and data acquisition are controlled using standard control inputs that allow easy interfacing with microprocessors and DSPs. The input signal is sampled on the falling edge of CONVST and the conversion is also initiated at this point.
The AD7938/AD7939 have an accurate on-chip 2.5 V reference that can be used as the reference source for the analog-to-digital conversion. Alternatively, this pin can be overdriven to provide an external reference.
These parts use advanced design techniques to achieve very low power dissipation at high throughput rates. They also feature flexible power management options. An on-chip control register allows the user to set up different operating conditions, including analog input range and configuration, output coding, power management, and channel sequencing.
Product Highlights
- High throughput with low power consumption.
- Eight analog inputs with a channel sequencer.
- Accurate on-chip 2.5 V reference.
- Single-ended, pseudo differential, or fully differential analog inputs that are software selectable.
- Single-supply operation with VDRIVE function. The VDRIVE function allows the parallel interface to connect directly to 3 V or 5 V processor systems independent of VDD.
- No pipeline delay.
- Accurate control of the sampling instant via a CONVST input and once-off conversion control.
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
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Support
Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
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AD7939
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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 |
|---|---|---|---|
| AD7939BCPZ |
32-Lead LFCSP (5mm x 5mm w/ EP)
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| AD7939BCPZ-REEL7 |
32-Lead LFCSP (5mm x 5mm w/ EP)
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| AD7939BSUZ |
32-Lead TQFP (7mm x 7mm x 1mm)
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| AD7939BSUZ-REEL7 |
32-Lead TQFP (7mm x 7mm x 1mm)
|
|
- AD7939BCPZ
- Pin/Package Drawing
-
32-Lead LFCSP (5mm x 5mm w/ EP)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- AD7939BCPZ-REEL7
- Pin/Package Drawing
-
32-Lead LFCSP (5mm x 5mm w/ EP)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- AD7939BSUZ
- Pin/Package Drawing
-
32-Lead TQFP (7mm x 7mm x 1mm)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
- AD7939BSUZ-REEL7
- Pin/Package Drawing
-
32-Lead TQFP (7mm x 7mm x 1mm)
- Documentation
-
HTML
Material Declaration
-
HTML
Reliablity Data
- CAD Symbols, Footprints, and 3D Models
-
Ultra Librarian
-
SamacSys
Filter by Model
Part Models
Product Lifecycle
PCN
Jun 9, 2021
- 20_0126
Conversion of Select Sizes LFCSP Products from Punched to Sawn and Transfer of Assembly Site to ASE Korea
AD7939BCPZ
PRODUCTION
AD7939BCPZ-REEL7
PRODUCTION
Sep 13, 2017
- 16_0077
CANCELLED: Conversion of Select 4x4, 5x5, 6x6 and 7x7mm LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to ASE Korea.
AD7939BCPZ
PRODUCTION
AD7939BCPZ-REEL7
PRODUCTION
Feb 8, 2010
- 04_0080
Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland.
AD7939BCPZ
PRODUCTION
AD7939BCPZ-REEL7
PRODUCTION
AD7939BSUZ
PRODUCTION
AD7939BSUZ-REEL7
PRODUCTION
Jan 5, 2009
- 07_0077
Certification of STATSChipPAC Shanghai, China and AMKOR Philippines as additional sources for Assembly & Test of QFP Packages
AD7939BSUZ
PRODUCTION
AD7939BSUZ-REEL7
PRODUCTION
Filter by Model
Part Models
Product Lifecycle
PCN
Jun 9, 2021
- 20_0126
Conversion of Select Sizes LFCSP Products from Punched to Sawn and Transfer of Assembly Site to ASE Korea
AD7939BCPZ
PRODUCTION
AD7939BCPZ-REEL7
PRODUCTION
Sep 13, 2017
- 16_0077
CANCELLED: Conversion of Select 4x4, 5x5, 6x6 and 7x7mm LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to ASE Korea.
AD7939BCPZ
PRODUCTION
AD7939BCPZ-REEL7
PRODUCTION
Feb 8, 2010
- 04_0080
Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland.
AD7939BCPZ
PRODUCTION
AD7939BCPZ-REEL7
PRODUCTION
AD7939BSUZ
PRODUCTION
AD7939BSUZ-REEL7
PRODUCTION
Jan 5, 2009
- 07_0077
Certification of STATSChipPAC Shanghai, China and AMKOR Philippines as additional sources for Assembly & Test of QFP Packages
AD7939BSUZ
PRODUCTION
AD7939BSUZ-REEL7
PRODUCTION
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Ultraprecision, Low Noise, 2.500 V XFET® Voltage References |
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Shunt Voltage References1 |
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PRODUCTION |
2.5 V/3.0 V High Precision Reference |
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Single-Ended to Differential Amplifiers2 |
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PRODUCTION |
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RECOMMENDED FOR NEW DESIGNS |
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