AD7685
PRODUCTION16-Bit, 250 kSPS PulSAR® ADC in MSOP/QFN
- Part Models
- 9
- 1ku List Price
- Starting From $9.19
Part Details
- 16-bit resolution with no missing codes
- Throughput: 250 kSPS
- INL: ±0.6 LSB typical, ±2 LSB maximum (±0.003% of FSR)
- SINAD: 93.5 dB @ 20 kHz
- THD: −110 dB @ 20 kHz
- Pseudo differential analog input range 0 V to VREF with VREF up to VDD
- No pipeline delay
- Daisy-chain multiple ADCs, BUSY indicator
- Single-supply operation 2.3 V to 5.5 V with 1.8 V to 5 V logic interface
- Serial interface SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
- Power dissipation:
1.4 μW @ 2.5 V/100 SPS
1.35 mW @ 2.5 V/100 kSPS, 4 mW @ 5 V/100 kSPS - Standby current: 1 nA
The AD7685 is a 16-bit, charge redistribution successive approximation, analog-to-digital converter (ADC) that operates from a single power supply, VDD, between 2.3 V to 5.5 V. It contains a 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, short aperture delay, track-and-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.
Power dissipation 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 or 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 AD7685 is housed in a 10-lead MSOP or a 10-lead QFN (LFCSP) with operation specified from −40°C to +85°C.
APPLICATIONS
- Battery-powered equipment
- Medical instruments
- Mobile communications
- Personal digital assistants (PDAs)
- Data acquisition
- Instrumentation
- Process controls
Documentation
Data Sheet 1
User Guide 2
Application Note 3
Technical Articles 4
Product Highlight 3
Tested Product Combinations 1
Product Highlight 3
Product Selection Guide 1
Tutorial 2
Technical Book 1
Device Drivers 1
Circuit Note 2
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 |
|---|---|---|---|
| AD7685ACPZRL7 | 10-Lead LFCSP (3mm x 3mm) | ||
| AD7685ARMZ | 10-Lead MSOP | ||
| AD7685ARMZRL7 | 10-Lead MSOP | ||
| AD7685BCPZRL7 | 10-Lead LFCSP (3mm x 3mm) | ||
| AD7685BRMZ | 10-Lead MSOP | ||
| AD7685BRMZRL7 | 10-Lead MSOP | ||
| AD7685CCPZRL7 | 10-Lead LFCSP (3mm x 3mm) | ||
| AD7685CRMZ | 10-Lead MSOP | ||
| AD7685CRMZRL7 | 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 |
||
| AD7685ACPZRL7 | PRODUCTION | |
| AD7685ARMZ | PRODUCTION | |
| AD7685ARMZRL7 | PRODUCTION | |
| AD7685BCPZRL7 | PRODUCTION | |
| AD7685BRMZ | PRODUCTION | |
| AD7685BRMZRL7 | PRODUCTION | |
| AD7685CCPZRL7 | PRODUCTION | |
| AD7685CRMZ | PRODUCTION | |
| AD7685CRMZRL7 | PRODUCTION | |
|
Jul 5, 2022 - 21_0271 Qualification of an Alternate Adhesive Material and Molding Compound for Select LFCSP Packages |
||
| AD7685ACPZRL7 | PRODUCTION | |
| AD7685BCPZRL7 | PRODUCTION | |
| AD7685CCPZRL7 | PRODUCTION | |
|
Oct 18, 2016 - 16_0036 Assembly Relocation to Stats ChipPAC Jiangyin and Test Transfer to Stats ChipPAC Singapore of Select LFCSP Products |
||
| AD7685ACPZRL7 | PRODUCTION | |
| AD7685BCPZRL7 | PRODUCTION | |
| AD7685CCPZRL7 | PRODUCTION | |
|
May 15, 2012 - 10_0006 Halogen Free Material Change for mini SOIC Products |
||
| AD7685ARMZ | PRODUCTION | |
| AD7685ARMZRL7 | PRODUCTION | |
| AD7685BRMZ | PRODUCTION | |
| AD7685BRMZRL7 | PRODUCTION | |
| AD7685CRMZ | PRODUCTION | |
| AD7685CRMZRL7 | PRODUCTION | |
|
Aug 25, 2009 - 09_0165 Test transfer of AD7683,AD7684, AD7685, AD7686, AD7942 and AD9833 from StatsChipPac Singapore (SCS) to Carsem Malaysia (CRS) |
||
| AD7685ARMZ | PRODUCTION | |
| AD7685ARMZRL7 | PRODUCTION | |
| AD7685BRMZ | PRODUCTION | |
| AD7685BRMZRL7 | PRODUCTION | |
| AD7685CRMZ | PRODUCTION | |
| AD7685CRMZRL7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
FPGA/HDL 4
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 |
| Multiple Output Buck Regulators 1 | ||
| ADP2114 | PRODUCTION | Configurable, Dual 2 A/Single 4 A, Synchronous Step-Down DC-to-DC Regulator |
| Positive Linear Regulators (LDO) 2 | ||
| ADP151 | PRODUCTION | Ultralow Noise, 200 mA, CMOS Linear Regulator |
| ADP160 | PRODUCTION | Ultra Low Quiescent Current 150 mA, CMOS Linear Regulator |
| Precision Op Amps (Vos ≤1mV & TCVos ≤2uV/C) 5 | ||
| AD8605 | PRODUCTION | Precision, Low Noise, CMOS, RRIO Op Amp (single) |
| 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 |
| Series Voltage References 3 | ||
| ADR435 | PRODUCTION | Ultralow Noise XFET® Voltage References with Current Sink and Source Capability |
| ADR4550 | PRODUCTION | Ultra-Low-Noise, High-Accuracy 5.0V Voltage Reference |
| ADR391 | PRODUCTION | 2.5V Micropower, Low Noise Precision Voltage Reference with Shutdown |
| Standard Digital Isolators 4 | ||
| ADUM3401 | PRODUCTION | Quad-Channel, Digital Isolator, Enhanced System-Level ESD Reliability |
| ADUM3481 | PRODUCTION | Small, 3.75 kV RMS Quad Digital Isolators (3/1 Channel Directionality) |
| ADUM1401 | PRODUCTION | Quad-Channel Digital Isolator (3/1 Channel Directionality) |
| 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 ToolAD7685 IBIS Models 1
Evaluation Kits
16-Bit, 250 kSPS PulSAR® ADC PMOD Evaluation Board
Resources
Software
AD7685 Evaluation Kit
Resources
Software
Reference Designs
Galvanically Isolated, 2-Channel, 16-Bit, Simultaneous Sampling, Daisy-Chained Data Acquisition System