AD7939
PRODUCTION8-Channel, 1.5 MSPS, 10-Bit Parallel ADCs with a Sequencer
- Part Models
- 4
- 1ku List Price
- Starting From $6.19
Part Details
- 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
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.
Documentation
Data Sheet 1
Technical Articles 2
Evaluation Design File 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 |
|---|---|---|---|
| AD7939BCPZ | 32-Lead LFCSP (5mm x 5mm w/ EP) | ||
| AD7939BCPZ-REEL7 | 32-Lead LFCSP (5mm x 5mm w/ EP) | ||
| AD7939BSUZ | 32-Lead TQFP (7mm x 7mm x 1mm) | ||
| AD7939BSUZ-REEL7 | 32-Lead TQFP (7mm x 7mm x 1mm) |
| 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 | |
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| High Voltage Op Amps ≥12V 1 | ||
| AD8022 | PRODUCTION | Dual High Speed, Low Noise Op Amp |
| Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 1 | ||
| AD8021 | PRODUCTION | Low Noise, High Speed Amplifier for 16-Bit Systems |
| Series Voltage References 2 | ||
| ADR420 | PRODUCTION | Ultraprecision, Low Noise, 2.048 V XFET® Voltage Reference |
| ADR421 | PRODUCTION | Ultraprecision, Low Noise, 2.500 V XFET® Voltage References |
| Shunt Voltage References 1 | ||
| AD780 | PRODUCTION | 2.5 V/3.0 V High Precision Reference |
| Single-Ended to Differential Amplifiers 2 | ||
| AD8138 | PRODUCTION | Low Distortion Differential ADC Driver |
| ADA4932-1 | RECOMMENDED FOR NEW DESIGNS | Low Power Differential ADC Driver |
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