My Inquiry
My Account
Analog Devices Inc. AD7685BRMZRL7
- Part No.:
- AD7685BRMZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7685BRMZRL7.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,066
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7685BRMZRL7 from Analog Devices is a 16-bit, pseudo-differential, successive-approximation ADC with 250 kSPS throughput, ±2 LSB max INL, 93.5 dB SINAD at 20 kHz, and no pipeline delay. It operates from a single 2.3 V to 5.5 V supply with 1.8 V to 5 V logic interface and is optimized for portable instrumentation requiring high resolution and low power.
For engineers reviewing the AD7685BRMZRL7 datasheet, AD7685BRMZRL7 pinout, AD7685BRMZRL7 application, or AD7685BRMZRL7 equivalent, key selection criteria include its true 16-bit no-missing-codes performance, daisy-chain SPI-compatible serial interface, 1 nA standby current, MSOP-10 package compatibility, and reference-flexible analog input range (0 V to VREF, VREF ≤ VDD).
Technical Context
The AD7685BRMZRL7 uses a charge redistribution SAR architecture with integrated track-and-hold, enabling acquisition in 1.8 µs and conversion in ≤2.2 µs (VDD ≥ 4.5 V). Its pseudo-differential input accepts IN+ relative to IN−, supporting ground-referenced or remote-sense configurations without external amplification.
It implements a proprietary SPI/QSPI/MICROWIRE/DSP-compatible 3- or 4-wire serial interface with optional BUSY indicator and daisy-chain capability. The separate VIO supply (1.8 V to VDD + 0.3 V) ensures interoperability with mixed-voltage host systems while maintaining full 16-bit data integrity and straight-binary output format.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full temperature range. |
| Throughput | 250 kSPS at VDD ≥ 4.5 V - supports real-time sampling of audio-band and control-loop signals. |
| INL | ±2 LSB maximum - ensures end-point linearity error ≤ ±0.003% of FSR for precision measurement. |
| SINAD | 93.5 dB at 20 kHz, VREF = 5 V - delivers >15.5 ENOB for high-fidelity signal capture. |
| Power @ 100 kSPS | 1.35 mW at 2.5 V - enables >10-year battery life in 100 SPS sleep-wake cycles. |
| Standby Current | 1 nA - allows ultra-low-power wake-on-event architectures without external power gating. |
| Analog Input Range | 0 V to VREF (VREF up to VDD) - eliminates need for level-shifting when using internal supply as reference. |
| Digital Interface | SPI-/QSPI-/MICROWIRE-/DSP-compatible, 3-/4-wire, daisy-chainable - reduces PCB routing and host GPIO count. |
Pinout & Package
AD7685BRMZRL7 is housed in a 10-lead MSOP package (3 mm × 3 mm, 0.85 mm height), pin-for-pin compatible with other PulSAR® 10-lead ADCs including AD7686/AD7687/AD7688. The exposed pad is connected to GND but not required for electrical performance compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF (Pin 1) | Reference Input | Accepts 0.5 V to VDD; must be decoupled with 10 µF capacitor; sets full-scale range for IN+–IN− differential input. |
| VDD (Pin 2) | Analog Power Supply | 2.3 V to 5.5 V single supply; powers core ADC, track-and-hold, and internal clock generator. |
| IN+ (Pin 3) | Pseudo-Differential Analog Input | Input voltage measured relative to IN−; range = 0 V to VREF; high-impedance during acquisition (1 nA leakage). |
| IN− (Pin 4) | Analog Ground Sense | Provides remote sense reference point; connects to analog ground plane or sensor return path. |
| GND (Pin 5) | Power Ground | Common return for VDD, REF, and digital supplies; separates analog/digital ground paths recommended. |
| CNV (Pin 6) | Convert Control Input | Rising edge initiates conversion and selects interface mode (CS or Chain); doubles as chip select in CS mode. |
| SDO (Pin 7) | Serial Data Output | 16-bit straight-binary MSB-first output synchronized to SCK; tri-state controlled by CNV/SDI in CS mode. |
| SCK (Pin 8) | Serial Clock Input | Drives data shift-out; minimum period 15 ns (VDD ≥ 4.5 V); supports up to 66.7 MHz clock rate. |
| SDI (Pin 9) | Serial Data Input / Mode Select | Low at CNV rising edge enables daisy-chain mode; high enables CS mode; also used for BUSY indicator enable. |
| VIO (Pin 10) | I/O Interface Supply | 1.8 V to VDD + 0.3 V; sets logic thresholds for all digital pins; isolates ADC core from host voltage variations. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion completion - eliminates latency-induced timing errors in closed-loop control. |
| Single-supply operation | 2.3 V to 5.5 V VDD with independent 1.8 V to 5 V VIO - simplifies power architecture in mixed-voltage embedded systems. |
| Daisy-chain capability | Supports cascading of multiple AD7685BRMZRL7 units on one SDO line - reduces host SPI peripheral usage and board space. |
| Ultra-low standby current | 1 nA at 5 V - enables microamp-level system sleep states without external power switches or LDOs. |
| Wide reference flexibility | VREF from 0.5 V to VDD - permits direct use of regulated supply rails as reference, eliminating external reference ICs. |
| High noise immunity | 65 dB analog input CMRR at 250 kHz - maintains accuracy in electrically noisy industrial or medical environments. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG/EEG signal digitization in handheld diagnostic devices with multi-day battery life. IC Role / Device Role / Timing Role: Primary analog front-end ADC capturing 16-bit biomedical waveforms at 250 kSPS with no missing codes and <2 µs aperture delay. Use Value: Enables clinical-grade waveform fidelity (93.5 dB SINAD) while drawing only 1.35 mW at 2.5 V - extends coin-cell battery life beyond 12 months. |
Use Scenario: Environmental parameter monitoring (temperature, humidity, pressure) in remote field deployments. IC Role / Device Role / Timing Role: Low-power SAR ADC performing burst-mode sampling every 10 seconds, then entering 1 nA standby until next trigger. Use Value: Achieves <1 µW average power consumption per sample via programmable throughput scaling - supports 10+ year deployments on primary lithium cells. |
| Industrial Process Controllers | Test & Measurement Equipment |
Use Scenario: High-accuracy analog input module for PLCs measuring 4–20 mA transducer outputs and thermocouple signals. IC Role / Device Role / Timing Role: Precision ADC with pseudo-differential inputs rejecting common-mode noise from long sensor cables and motor drives. Use Value: Delivers ±2 LSB INL and 65 dB CMRR - eliminates calibration drift caused by ground loops and EMI in factory-floor environments. |
Use Scenario: Modular digitizer card in benchtop oscilloscopes and spectrum analyzers requiring clean, low-latency sampling. IC Role / Device Role / Timing Role: Zero-latency SAR converter providing immediate 16-bit results for real-time triggering and waveform reconstruction. Use Value: No pipeline delay and 1.8 µs acquisition time enable precise edge detection and jitter-free time-domain analysis. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7687BRMZ | Same 10-lead MSOP package, 500 kSPS throughput, ±1.5 LSB max INL, higher power (2.7 mW @ 2.5 V/200 kSPS) | Better speed and linearity, but consumes >2× power - suited for mains-powered test equipment where resolution/speed trade-off favors speed | Select AD7687BRMZ when >250 kSPS is required and power budget allows; AD7685BRMZRL7 remains optimal for battery-constrained 250 kSPS use cases. |
| ADS8860IDRCT | Texas Instruments 16-bit SAR ADC in 10-pin VSSOP; 1 MSPS, ±1.25 LSB INL, 2.5 V–5.5 V supply, SPI interface | Higher throughput and tighter INL, but requires external reference and lacks daisy-chain mode - increases BOM and layout complexity | Choose ADS8860IDRCT for maximum speed in space-constrained designs where external reference is acceptable; AD7685BRMZRL7 offers superior integration for low-power, reference-flexible systems. |
Compared with AD7687BRMZ and ADS8860IDRCT, AD7685BRMZRL7 uniquely balances 250 kSPS throughput, 1 nA standby, no-missing-codes linearity, and integrated daisy-chain capability - making it the most energy-efficient choice for portable, multi-channel, battery-operated precision data acquisition.
Availability
AD7685BRMZRL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, industrial process controllers, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7685BRMZRL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers and manufacturing facilities worldwide.
The AD7685BRMZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs, engineered for applications demanding true 16-bit resolution, low power, and seamless integration into compact, battery-sensitive systems without sacrificing AC performance.
FAQ
What is the maximum sampling rate of the AD7685BRMZRL7?
The AD7685BRMZRL7 achieves a maximum throughput of 250 kSPS when operated with VDD ≥ 4.5 V. At lower supply voltages (2.3 V to 4.5 V), the maximum rate drops to 200 kSPS. This specification is guaranteed over the full −40°C to +85°C operating temperature range and reflects the time between consecutive conversions (tCYC = 4 µs min at VDD ≥ 4.5 V).
Does the AD7685BRMZRL7 require an external reference voltage?
No - the AD7685BRMZRL7 does not require an external reference, though it supports one. Its REF pin accepts an externally applied voltage from 0.5 V to VDD, enabling direct use of the VDD rail as the reference source. When VREF = VDD, the analog input range becomes 0 V to VDD, simplifying design and reducing BOM count.
Can the AD7685BRMZRL7 interface with a 1.8 V microcontroller?
Yes - the AD7685BRMZRL7 features a dedicated VIO supply pin (Pin 10) that accepts 1.8 V to VDD + 0.3 V. With VIO = 1.8 V, all digital inputs (CNV, SDI, SCK) recognize logic thresholds of 0.3 × 1.8 V = 0.54 V (VIL) and 0.7 × 1.8 V = 1.26 V (VIH), ensuring reliable communication with 1.8 V logic families without level shifters.
What is the significance of "no pipeline delay" in the AD7685BRMZRL7?
"No pipeline delay" means the AD7685BRMZRL7 is a pure successive-approximation ADC with zero latency between conversion initiation and result availability. Unlike pipelined or sigma-delta converters, it outputs the sampled value immediately after conversion completes (≤2.2 µs), enabling deterministic timing for real-time control loops and trigger-based acquisition.
Is the AD7685BRMZRL7 pin-compatible with other PulSAR® ADCs?
Yes - the AD7685BRMZRL7 is explicitly pin-for-pin compatible with the AD7686, AD7687, and AD7688 in the 10-lead MSOP package. This allows drop-in upgrades within the same footprint: for example, replacing AD7685BRMZRL7 with AD7687BRMZ enables 500 kSPS operation without PCB redesign, provided power and thermal constraints permit.
AD7685BRMZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential
- Data Interface:
- SPI, DSP
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.3V ~ 5.5V
- Voltage - Supply, Digital:
- 2.3V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7685BRMZRL7 FAQ
1.How can I place an order for AD7685BRMZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7685BRMZRL7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AD7685BRMZRL7 reliable?
The price and inventory of AD7685BRMZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7685BRMZRL7 is usually 5 days.
3.What payment methods are accepted for AD7685BRMZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7685BRMZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7685BRMZRL7?
AD7685BRMZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7685BRMZRL7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AD7685BRMZRL7?
For technical support, including AD7685BRMZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7685BRMZRL7 requirements.
6.How does Aetrix verify that AD7685BRMZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7685BRMZRL7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7685BRMZRL7 meets industry standards.
7.What is the process for return or replacement of AD7685BRMZRL7?
All AD7685BRMZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7685BRMZRL7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AD7685BRMZRL7 part is unused and in its original packaging.
Return procedure for AD7685BRMZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7685BRMZRL7 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
