My Inquiry
My Account
Analog Devices Inc. AD7687BRMZ
- Part No.:
- AD7687BRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7687BRMZ.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:200
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7687BRMZ from Analog Devices is a 16-bit, charge redistribution successive approximation ADC with true differential input, ±1.5 LSB max INL, 250 kSPS throughput, and no pipeline delay-designed for precision data acquisition in battery-powered instrumentation and medical devices.
For engineers reviewing the AD7687BRMZ datasheet, AD7687BRMZ pinout, AD7687BRMZ application, or AD7687BRMZ equivalent, this page delivers verified specifications, MSOP-10 pin mapping, SPI/QSPI/MICROWIRE-compatible serial interface behavior, and validated alternatives for low-power, high-accuracy analog-to-digital conversion.
Technical Context
The AD7687BRMZ implements a capacitor-based successive approximation register (SAR) architecture with integrated track-and-hold, enabling zero-latency conversion and full 16-bit no-missing-codes performance. Its differential input stage accepts ±VREF ranges up to ±5 V (with 5 V reference), and aperture delay is fixed at 2.5 ns (VDD = 5 V).
It features a proprietary SPI-compatible serial interface supporting CS mode (3-/4-wire) and daisy-chain mode, with BUSY indicator capability via SDI pin. Power scaling is linear with throughput: 1.35 mW at 2.5 V/100 kSPS and 12.5 mW at 5 V/250 kSPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes-guarantees monotonicity and full-scale fidelity in precision measurement systems. |
| INL (max) | ±1.5 LSB (±23 ppm of FSR)-enables <0.0023% absolute accuracy for calibrated sensor interfaces. |
| Throughput | 250 kSPS (VDD ≥ 4.5 V)-supports real-time sampling of audio-band and control-loop signals without undersampling. |
| SNR | 95.5 dB at 20 kHz (VREF = 5 V)-delivers >15.8 ENOB for high-fidelity signal capture in instrumentation. |
| Analog Input Range | True differential ±VREF (−5 V to +5 V with 5 V reference)-simplifies bipolar sensor front-end design without level-shifting. |
| Power Dissipation | 1.4 µW at 2.5 V/100 SPS-enables multi-year operation on coin-cell batteries in portable diagnostics. |
| Interface Logic | 1.8 V to 5 V VIO supply-allows direct connection to ultra-low-voltage microcontrollers without level shifters. |
| Operating Temp | −40°C to +85°C-qualified for industrial and medical environments without derating. |
Pinout & Package
AD7687BRMZ is packaged in a 10-lead MSOP (3 mm × 3 mm) with exposed pad not connected (non-thermal). Pin functions are electrically identical to the LFCSP variant but lack thermal paddle requirement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Analog reference input | Accepts external 0.5 V to VDD reference; requires 10 µF decoupling for noise-sensitive applications. |
| 2 VDD | Analog power supply | 2.3 V to 5.5 V single supply; powers core ADC and internal track-and-hold. |
| 3 IN+ | Differential analog input (+) | Accepts voltage from −VREF to +VREF relative to IN−; common-mode range 0 to VREF/2 + 0.1 V. |
| 4 IN− | Differential analog input (−) | Reference node for IN+; must be driven with matched impedance to minimize CMRR degradation. |
| 5 GND | Analog ground | Single-point return for REF, IN+, IN−, and VDD; separate from digital ground unless star-connected. |
| 6 CNV | Convert trigger / interface mode select | Rising edge initiates conversion; state of SDI at CNV edge selects CS vs. daisy-chain mode. |
| 7 SDO | Serial data output / BUSY indicator | Outputs 16-bit two's complement result synchronized to SCK; doubles as BUSY flag when enabled. |
| 8 SCK | Serial clock input | Drives data shift-out timing; SCK state at CNV rising edge enables/disables BUSY function. |
| 9 SDI | Serial data input / mode control | High at CNV edge selects CS mode; low selects daisy-chain; also carries upstream ADC data in chain mode. |
| 10 VIO | Digital I/O power supply | Independent 1.8 V–5 V rail for logic interface-decouples ADC timing from host MCU voltage domain. |
Key Features
| Feature | Design Value |
|---|---|
| No pipeline delay | Immediate data availability after conversion completes-eliminates latency-induced phase errors in closed-loop control. |
| Daisy-chain capability | Multiple AD7687BRMZ units share one SDO line using SDI as data-in-reduces PCB routing and host GPIO count. |
| Ultra-low standby current | 1 nA typical (VDD/VIO = 5 V, 25°C)-enables wake-on-convert architectures with sub-µA system sleep current. |
| True differential input | 65 dB CMRR at 250 kHz-rejects common-mode noise from motor drives or switching supplies in industrial sensors. |
| Flexible reference support | VREF range 0.5 V to VDD-permits use of internal LDOs, bandgap references, or precision external refs without gain stages. |
| Wide supply compatibility | VDD 2.3 V–5.5 V + VIO 1.8 V–5 V-supports direct interfacing to 1.8 V FPGAs, 3.3 V MCUs, and 5 V legacy controllers. |
Applications
| Battery-Powered Medical Sensors | Industrial Process Monitoring |
|---|---|
Use Scenario: Portable ECG front-end digitizing biopotential signals with ±2.5 V range and 1 kHz bandwidth. IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential lead voltages with 95.5 dB SNR and no latency-induced waveform distortion. Use Value: Enables >15-bit effective resolution at 250 kSPS while consuming only 1.35 mW-extending AA-battery life to >12 months. |
Use Scenario: Multi-channel temperature/pressure monitoring in PLC analog input modules with 4–20 mA loop receivers. IC Role / Device Role / Timing Role: High-accuracy ADC for isolated sensor signal conditioning, operating across −40°C to +85°C with ±1.5 LSB INL stability. Use Value: Eliminates calibration drift over temperature due to <±0.3 ppm/°C offset drift and matched gain error tracking. |
| Portable Data Acquisition Systems | Test & Measurement Equipment |
Use Scenario: Handheld oscilloscope with 16-bit vertical resolution, sampling at 250 kSPS per channel across dual inputs. IC Role / Device Role / Timing Role: Dual AD7687BRMZ units in daisy-chain mode provide synchronized 16-bit samples on shared SDO/SCK lines. Use Value: Reduces digital interface footprint by 40% versus parallel-output ADCs while maintaining full throughput and timing coherence. |
Use Scenario: Benchtop multimeter requiring 96.5 dB dynamic range and <−118 dB THD for AC voltage measurements. IC Role / Device Role / Timing Role: Precision ADC core referenced to ultra-stable 5 V source, delivering 95.5 dB SNR at 20 kHz test tone. Use Value: Meets Class I accuracy requirements per IEC 61000-4-30 with verified spurious-free dynamic range >118 dB. |
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 |
|---|---|---|---|
| AD7685BRMZ | 100 kSPS max throughput, same 10-lead MSOP package and pinout-lower power (0.7 mW @ 2.5 V/100 kSPS) but half the speed. | Suitable for slower sensor readouts (e.g., thermocouples, RTDs) where 250 kSPS is unnecessary. | Select AD7685BRMZ when system sampling rate ≤100 kSPS and lowest possible active power is critical. |
| AD7688BRMZ | 500 kSPS throughput, identical architecture and pinout-requires higher supply current (25 mW @ 5 V/500 kSPS) and tighter layout for noise control. | Required for ultrasound imaging front-ends or high-speed vibration analysis demanding >250 kSPS. | Choose AD7688BRMZ only if application mandates >250 kSPS; otherwise AD7687BRMZ offers optimal power/speed balance. |
Compared with AD7685BRMZ and AD7688BRMZ, the AD7687BRMZ uniquely balances 250 kSPS throughput, 1.35 mW power at 2.5 V, and ±1.5 LSB INL-making it the optimal choice for portable instrumentation where speed, accuracy, and battery life intersect.
Availability
AD7687BRMZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial process controllers, portable data acquisition systems, and test equipment requiring stable component supply across extended product lifecycles.
Supply support for AD7687BRMZ 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 R&D and manufacturing operations worldwide.
The AD7687BRMZ belongs to the PulSAR® family of precision SAR ADCs-engineered specifically for low-power, high-accuracy data acquisition in space-constrained, battery-operated, and industrial-grade systems.
FAQ
What is the maximum sampling rate of the AD7687BRMZ under standard operating conditions?
The AD7687BRMZ achieves a maximum throughput of 250 kSPS when VDD is between 4.5 V and 5.5 V. At lower supply voltages (2.3 V to 4.5 V), the rated maximum drops to 200 kSPS. This specification is guaranteed over the full −40°C to +85°C temperature range and reflects the time required for full 16-bit conversion including acquisition and settling. The AD7687BRMZ does not require external clocks or pipeline staging to reach this rate.
Does the AD7687BRMZ require an external reference voltage, and what are its voltage limits?
Yes, the AD7687BRMZ requires an external reference applied to the REF pin. The valid range is 0.5 V to VDD, with load current up to 50 µA at 250 kSPS. For example, with VDD = 5 V, REF may be set to 2.5 V, 4.096 V, or 5.0 V-enabling flexible full-scale ranges from ±2.5 V to ±5.0 V. The AD7687BRMZ does not include an internal reference; using an inaccurate or noisy reference directly degrades INL and SNR performance.
Can the AD7687BRMZ interface directly with a 1.8 V microcontroller without level shifting?
Yes, the AD7687BRMZ supports 1.8 V logic via its dedicated VIO pin. When VIO = 1.8 V, all digital inputs (CNV, SCK, SDI) accept 0.3 × 1.8 V = 0.54 V (min) VIH and 0.7 × 1.8 V = 1.26 V (max) VIL thresholds, and digital outputs (SDO) drive to VOH ≥ 1.5 V and VOL ≤ 0.4 V-fully compliant with 1.8 V CMOS logic families. No external level shifters are needed.
How does the daisy-chain mode work on the AD7687BRMZ, and what is its timing impact?
In daisy-chain mode-activated when SDI is low at the CNV rising edge-the AD7687BRMZ outputs its 16-bit result on SDO while simultaneously accepting the upstream ADC's data on SDI. Each device delays the upstream data by exactly 16 SCK cycles. Total latency for N devices is N × conversion time + (N−1) × 16 × tSCK. This preserves sample synchronization across channels without requiring additional frame-sync signals.
Is the AD7687BRMZ pin-compatible with other devices in the PulSAR® family, and which ones?
Yes, the AD7687BRMZ is pin-for-pin compatible with the AD7685BRMZ (100 kSPS), AD7686BRMZ (250 kSPS, pseudo-differential), and AD7688BRMZ (500 kSPS) in both 10-lead MSOP and 10-lead LFCSP packages. This allows drop-in upgrades or downgrades based on speed/power trade-offs without PCB redesign-provided the reference, input configuration, and timing constraints align with the selected variant.
AD7687BRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 250k
- Number of Inputs:
- 1
- Input Type:
- 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:
- -
AD7687BRMZ FAQ
1.How can I place an order for AD7687BRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7687BRMZ 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 AD7687BRMZ reliable?
The price and inventory of AD7687BRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7687BRMZ is usually 5 days.
3.What payment methods are accepted for AD7687BRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7687BRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7687BRMZ?
AD7687BRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7687BRMZ 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 AD7687BRMZ?
For technical support, including AD7687BRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7687BRMZ requirements.
6.How does Aetrix verify that AD7687BRMZ is sourced from the original manufacturer or authorized distributors?
All AD7687BRMZ 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 AD7687BRMZ meets industry standards.
7.What is the process for return or replacement of AD7687BRMZ?
All AD7687BRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7687BRMZ, 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 AD7687BRMZ part is unused and in its original packaging.
Return procedure for AD7687BRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7687BRMZ 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…
