AD7946
PRODUCTION14-Bit, 500 kSPS PulSAR® ADC in MSOP
- Part Models
- 2
- 1ku List Price
- Starting From $11.53
Part Details
- 14-bit resolution with no missing codes
- Throughput: 500 kSPS
- INL: ±0.4 LSB typical, ±1 LSB maximum (±0.0061% of FSR)
- SINAD: 85 dB at 20 kHz
- THD: −100 dB at 20 kHz
- Pseudo differential analog input range
- 0 V to REF with REF up to VDD
- No pipeline delay
- Single-supply 5 V operation with 1.8 V/2.5 V/3 V/5 V logic interface
- Proprietary serial interface
- SPI-/QSPI™-/MICROWIRE™-/DSP-compatible
- Daisy-chain multiple ADCs and BUSY indicator
- Power dissipation
- 3.3 mW at 5 V/100 kSPS
- 3.3 μW at 5 V/100 SPS
- Standby current: 1 nA
- 10-lead MSOP (MSOP-8 size) and
- 3 mm × 3 mm LFCSP (SOT-23 size)
- Pin-for-pin compatible with the 16-bit AD7686
The AD7946 is a 14-bit, 500 kSPS, charge redistribution successive-approximation Analog-to-Digital Converter which operates from a single 5V power supply, VDD. It contains a very low power high-speed 16-bit sampling ADC with no missing codes, an internal conversion clock and a versatile serial interface port. The part also contains a low noise, wide bandwidth, very short aperture delay track/hold circuit. On the CNV rising edge, it samples an analog input IN+ between 0 V to REF with respect to a ground sense IN-. The reference voltage REF is applied externally and can be set up to the supply voltage.
Its power scales linearly with throughput.
The SPI compatible serial interface also features the ability, using the SDI input, to daisy chain several ADCs on a single 3 wire bus and provides an optional Busy indicator. It is compatible with 1.8 V, 2.5 V, 3 V or 5 V logic using the separate supply VIO.
The AD7946 is housed in a 10-lead µSOIC or 10-lead QFN (LFCSP) with operation specified from –40°C to +85°C.
Applications
- Battery-powered equipment
- Data acquisition
- Instrumentation
- Medical instruments
- Process control
Documentation
Data Sheet 1
User Guide 2
Application Note 1
Technical Articles 1
Product Highlight 1
Tested Product Combinations 1
Product Highlight 1
Device Drivers 1
Rarely Asked Question Page 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 |
|---|---|---|---|
| AD7946BRMZ | 10-Lead MSOP | ||
| AD7946BRMZRL7 | 10-Lead MSOP |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
May 20, 2024 - 23_0143 Qualification of an Alternate Wafer Fab Site for 0.5um TSMC CMOS Process |
||
| AD7946BRMZ | PRODUCTION | |
| AD7946BRMZRL7 | PRODUCTION | |
|
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products |
||
| AD7946BRMZ | PRODUCTION | |
| AD7946BRMZRL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
FPGA/HDL 2
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| High Speed Op Amps (Bandwidth ≥ 50MHz) 2 | ||
| ADA4807-1 | RECOMMENDED FOR NEW DESIGNS |
3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifier |
| ADA4807-2 | RECOMMENDED FOR NEW DESIGNS |
3.1 nV/√Hz, 1 mA, 180 MHz, Rail-to-Rail Input/Output Amplifier |
| Low Input Bias Current Op Amps (≤100 pA) 3 | ||
| ADA4627-1 | PRODUCTION | 36 V, 19 MHz, Low Noise, Low Bias Current, JFET Op Amp |
| ADA4637-1 | PRODUCTION | 30 V, 80 MHz, Low Noise, Low Bias Current, JFET Op Amp |
| AD8610 | PRODUCTION | Precision, Low Input Bias Current, Wide BW JFET Single Op Amp |
| Low Noise Op Amps (≤ 10nV/√Hz) 2 | ||
| ADA4897-1 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers |
| ADA4897-2 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power Operational Amplifier |
| Low Power Op Amps (≤ 1mA/amp) 1 | ||
| AD8031 | PRODUCTION | 2.7 V, 800 µA, 80 MHz Rail-to-Rail I/O Single Amplifier |
| Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 5 | ||
| ADA4805-1 | RECOMMENDED FOR NEW DESIGNS | 0.2 µV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifier |
| ADA4805-2 | RECOMMENDED FOR NEW DESIGNS | Dual, 0.2 µV/°C Offset Drift, 105 MHz Low Power, Low Noise, Rail-to-Rail Amplifier |
| ADA4841-1 | PRODUCTION | Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier |
| ADA4841-2 | PRODUCTION | Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier |
| AD8603 | PRODUCTION | MicroPower RRIO Low Noise Precision Single CMOS Op Amp |
| Series Voltage References 2 | ||
| ADR433 | PRODUCTION | Ultralow Noise XFET® 3.0V Voltage Reference w/Current Sink and Source Capability |
| ADR445 | PRODUCTION | Ultralow Noise, LDO XFET® 5.0V Voltage Reference w/Current Sink and Source |
| Standard Digital Isolators 4 | ||
| ADUM4401 | PRODUCTION |
5 kV RMS Quad-Channel Digital Isolators |
| ADUM1401 | PRODUCTION | Quad-Channel Digital Isolator (3/1 Channel Directionality) |
| ADUM3481 | PRODUCTION | Small, 3.75 kV RMS Quad Digital Isolators (3/1 Channel Directionality) |
| ADUM3401 | PRODUCTION | Quad-Channel, Digital Isolator, Enhanced System-Level ESD Reliability |
| Parts | Product Life Cycle | Description |
|---|---|---|
| AD7944 | PRODUCTION | 14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP |
Tools & Simulations
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
Open ToolAD7685 IBIS Models 1
Evaluation Kits
14-Bit, 500 kSPS PulSAR® ADC PMOD Evaluation Board
Resources
Software
AD7946 Evaluation kit