AD7985
PRODUCTION16-Bit, 2.5 MSPS PulSAR 11 mW ADC in QFN
- Part Models
- 2
- 1ku List Price
- Starting From $18.85
Part Details
- 16-bit resolution with no missing codes
- Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
- Low power dissipation
- 15.5 mW at 2.5 MSPS, with external reference
- 28 mW at 2.5 MSPS, with internal reference
- INL: ±0.7 LSB typical, ±1.5 LSB maximum
- SNR
- 88.5 dB, with on-chip reference
- 90 dB, with external reference
- 4.096 V internal reference: typical drift of ±10 ppm/°C
- Pseudo differential analog input voltage range
- 0 V to VREF with VREF up to 5.0 V
- Allows use of any input range
- See data sheet for additional features
The AD7985 is a 16-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 16-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7985 samples an analog input, IN+, between 0 V and REF with respect to a ground sense, IN−. The AD7985 features a very high sampling rate turbo mode (TURBO is high) and a reduced power normal mode (TURBO is low) for low power applications where the power is scaled with the throughput.
In normal mode (TURBO is low), 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 provide an optional busy indicator. It is compatible with 1.8 V, 2.5 V, and 2.7 V supplies using the separate VIO supply.
The AD7985 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.
Applications
- Battery-powered equipment
- Communications
- ATE
- Data acquisition systems
- Medical instruments
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Technical Articles 3
Tutorial 2
Product Selection Guide 1
Technical Book 1
Device Drivers 4
Analog Dialogue 2
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 |
|---|---|---|---|
| AD7985BCPZ | 20-Lead LFCSP (4mm x 4mm w/ EP) | ||
| AD7985BCPZ-RL7 | 20-Lead LFCSP (4mm x 4mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jul 25, 2017 - 17_0068 CANCELLED: Addition of ASE Korea as an Alternate Assembly Site for Select 3x3mm and 4x4mm Body Sizes LFCSP Devices |
||
| AD7985BCPZ | PRODUCTION | |
| AD7985BCPZ-RL7 | PRODUCTION | |
|
May 5, 2014 - 14_0020 Conversion of 4x4mm body Size LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines. |
||
| AD7985BCPZ | PRODUCTION | |
| AD7985BCPZ-RL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 4
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| 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 | ||
| ADA4896-2 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers |
| ADA4897-1 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers |
| 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) 3 | ||
| AD8605 | PRODUCTION | Precision, Low Noise, CMOS, RRIO Op Amp (single) |
| ADA4841-1 | PRODUCTION | Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier |
| AD8021 | PRODUCTION | Low Noise, High Speed Amplifier for 16-Bit Systems |
| Series Voltage References 6 | ||
| ADR435 | PRODUCTION | Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
| ADR4550 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 5.0V Voltage Reference |
| ADR431 | PRODUCTION | Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
| ADR4525 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 2.5V Voltage Reference |
| ADR433 | PRODUCTION | Ultralow Noise XFET® 3.0V Voltage Reference w/Current Sink and Source Capability |
| ADR4533 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 3.3V Voltage Reference |
| Standard Digital Isolators 4 | ||
| ADUM3481 | PRODUCTION | Small, 3.75 kV RMS Quad Digital Isolators (3/1 Channel Directionality) |
| ADUM1401 | PRODUCTION | Quad-Channel Digital Isolator (3/1 Channel Directionality) |
| ADUM3401 | PRODUCTION | Quad-Channel, Digital Isolator, Enhanced System-Level ESD Reliability |
| ADUM4401 | PRODUCTION |
5 kV RMS Quad-Channel Digital Isolators |
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 ToolIBIS Model 1
Evaluation Kits
AD7985 Evaluation Board