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Analog Devices Inc. AD7691BCPZRL7
- Part No.:
- AD7691BCPZRL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-VFDFN Exposed Pad, CSP
- Datasheet:
-
AD7691BCPZRL7.pdf
- Description:
- IC ADC 18BIT SAR 10LFCSP
- Quantity:
- Payment:
- Shipping:
Inventory:317
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Product details
Overview
AD7691BCPZRL7 from Analog Devices is an 18-bit, charge redistribution successive approximation register (SAR) analog-to-digital converter with true differential input, ±1.5 LSB INL max, 250 kSPS throughput, and no pipeline delay-designed for high-precision data acquisition in battery-powered instrumentation and seismic systems.
For engineers reviewing the AD7691BCPZRL7 datasheet, AD7691BCPZRL7 pinout, AD7691BCPZRL7 application, or AD7691BCPZRL7 equivalent, this page delivers verified specifications, validated package mapping to 10-lead LFCSP, confirmed SPI/QSPI/MICROWIRE-compatible serial interface behavior, and real-world use context for low-power, high-resolution sampling.
Technical Context
The AD7691BCPZRL7 implements a single-supply SAR architecture with integrated track-and-hold, enabling zero-latency conversion and full-scale step acquisition in 1.8 µs. It accepts true differential analog inputs spanning ±VREF with common-mode range centered at VREF/2, and supports external reference voltages from 0.5 V to VDD.
Its proprietary serial interface operates in either CS mode (3- or 4-wire) or daisy-chain mode, with optional busy indicator and 1.8 V–5 V logic compatibility via dedicated VIO supply. Power scales linearly with throughput: 1.35 mW at 2.5 V/100 kSPS, dropping to 1.4 µW at 100 SPS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit with no missing codes-guarantees monotonicity and unambiguous code mapping across full scale. |
| Throughput | 250 kSPS maximum at VDD ≥ 4.5 V-enables real-time capture of wideband sensor signals up to ~1 MHz Nyquist. |
| INL | ±1.5 LSB max (±6 ppm of FSR)-ensures <±12 µV error over ±5 V input range, critical for calibration-grade measurement. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP compatible with daisy-chain capability-reduces host GPIO count and simplifies multi-channel ADC synchronization. |
| Supply Range | VDD = 2.3 V to 5.25 V; VIO = 1.8 V to VDD-supports direct interfacing with ultra-low-voltage microcontrollers and mixed-signal SoCs. |
| Power @ 100 kSPS | 1.35 mW at 2.5 V, 4.24 mW at 5 V-enables >1-year operation on coin-cell batteries in intermittent-sampling applications. |
| Standby Current | 1 nA-allows rapid wake-from-sleep without significant leakage penalty in duty-cycled systems. |
Pinout & Package
The AD7691BCPZRL7 is housed in a 10-lead, 3 mm × 3 mm LFCSP (lead-frame chip-scale package) with exposed pad, rated for −40°C to +85°C operation. Pin 1 is REF; the exposed pad must be soldered to ground for thermal and reliability performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF | Analog reference input | Accepts 0.5 V to VDD; requires local 10 µF decoupling-sets full-scale range and directly impacts gain accuracy and noise floor. |
| VDD | Analog power supply | 2.3 V–5.25 V single supply powers core ADC and internal reference buffer-shared with REF when VREF = VDD. |
| IN+, IN− | Differential analog inputs | True differential pair with ±VREF range and 65 dB CMRR at 250 kHz-rejects common-mode noise in noisy industrial environments. |
| GND | Analog ground | Reference return for analog circuitry-must be separated from digital ground and tied at single point near VDD decoupling. |
| CNV | Convert control input | Rising edge initiates sampling and selects interface mode (CS vs. chain); also enables SDO in CS mode when low. |
| SDO | Serial data output | 18-bit two's complement MSB-first output synchronized to SCK-drives 50 pF load with 4 ns hold time at 5 V. |
| SCK | Serial clock input | Accepts 15 ns min period (66.7 MHz) at VIO > 4.5 V-supports high-speed readout without external timing constraints. |
| SDI | Serial data input / mode select | Low at CNV rising edge enables daisy-chain mode; high enables CS mode-configures interface behavior at runtime. |
| VIO | Digital I/O supply | 1.8 V–5 V independent supply sets logic thresholds-decouples ADC timing from host MCU voltage domain. |
Key Features
| Feature | Design Value |
|---|---|
| Oversampled dynamic range | 125 dB at 1 kSPS-achieved by post-digital filtering, enabling 20-bit noise-free resolution for slow-varying sensor outputs. |
| Effective resolution | 22.7 bits at 1 kSPS-quantifies RMS noise-limited resolution, supporting sub-microvolt signal detection in precision instrumentation. |
| No pipeline delay | Zero latency between CNV edge and valid output-eliminates timing compensation in closed-loop control and multiplexed channel sequencing. |
| True differential input | ±VREF range with 102 dB typical dynamic range at 250 kSPS-preserves SNR in high-common-mode-noise environments like motor drives or medical EEG. |
| Low power scaling | 1.4 µW at 100 SPS-enables energy harvesting and wireless sensor node designs where average current must stay below 1 µA. |
Applications
| Portable Medical Instrumentation | Seismic Data Acquisition |
|---|---|
Use Scenario: High-fidelity ECG/EEG front-end digitizing microvolt-level bio-signals with minimal power draw. IC Role / Device Role / Timing Role: Primary SAR ADC capturing differential electrode pairs at 1–10 kSPS with 18-bit fidelity and no missing codes. Use Value: 102 dB dynamic range and 1.5 LSB INL ensure clinical-grade waveform integrity; 1.4 µW standby extends battery life beyond 12 months. |
Use Scenario: Multi-channel geophone array digitization in remote oil/gas exploration equipment. IC Role / Device Role / Timing Role: Precision ADC per channel with daisy-chain interface reducing FPGA pin count and PCB routing complexity. Use Value: ±1.5 LSB INL and 125 dB oversampled DR enable accurate low-frequency earth vibration analysis down to 0.1 Hz. |
| Battery-Powered Test Equipment | High-Accuracy Industrial DAQ |
Use Scenario: Handheld multimeter or portable oscilloscope capturing DC/AC signals with 6½-digit equivalent resolution. IC Role / Device Role / Timing Role: Core ADC with external precision reference and programmable gain amplifier driving IN+/IN−. Use Value: True differential input rejects power supply ripple; 250 kSPS throughput supports fast auto-ranging and transient capture. |
Use Scenario: Modular PLC analog input module requiring traceable metrology-grade linearity over temperature. IC Role / Device Role / Timing Role: High-stability ADC with external ovenized reference, operating in CS mode for deterministic timing control. Use Value: ±0.3 ppm/°C gain drift and −40°C to +85°C spec ensure <±0.005% FS error across industrial ambient conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7690BCPZRL7 | Pin-for-pin compatible 18-bit SAR ADC; identical package and interface but lower 100 kSPS throughput and reduced dynamic range (99 dB). | Best suited for cost-sensitive, lower-bandwidth applications where 250 kSPS is unnecessary. | Select AD7690BCPZRL7 only if system sampling rate ≤100 kSPS and 3 dB SNR margin can be sacrificed. |
| AD7687BRMZ-REEL7 | 16-bit, 250 kSPS SAR ADC in same 10-lead MSOP/LFCSP; ±1.5 LSB INL, but 92 dB dynamic range and no oversampling capability. | Appropriate for applications trading 2-bit resolution for lower cost and smaller software footprint (16-bit data path). | Choose AD7687BRMZ-REEL7 when 16-bit resolution meets accuracy requirements and BOM cost reduction is prioritized. |
Compared with AD7691BCPZRL7, AD7690BCPZRL7 offers identical form factor and interface at lower speed, while AD7687BRMZ-REEL7 delivers matching throughput with reduced resolution and dynamic range-making AD7691BCPZRL7 the sole option for 18-bit, 250 kSPS, oversampled applications demanding <±12 µV linearity.
Availability
AD7691BCPZRL7 is available at Aetrix Electronics and suitable for portable medical instrumentation, seismic data acquisition, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for AD7691BCPZRL7 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 and manufacturing expertise spanning precision data conversion, amplification, and power management.
The AD7691BCPZRL7 belongs to Analog Devices' PulSAR® family of precision SAR ADCs-engineered specifically for high-resolution, low-power, zero-latency data acquisition in portable, industrial, and scientific instrumentation.
FAQ
What is the maximum sampling rate of the AD7691BCPZRL7?
The AD7691BCPZRL7 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 180 kSPS. This specification is fully characterized across the −40°C to +85°C temperature range and reflects the time required for full conversion, acquisition, and serial readout-verified in Table 2 and Table 5 of the Rev. E datasheet.
Does the AD7691BCPZRL7 require an external reference voltage?
Yes, the AD7691BCPZRL7 requires an external reference voltage applied to the REF pin, which can range from 0.5 V to VDD. The device does not include an internal reference. When VREF = VDD, the analog input range becomes ±VDD, and the part draws reference load current up to 60 µA at 250 kSPS-details confirmed in Table 3 and the General Description section of the AD7691 datasheet.
Is the AD7691BCPZRL7 pin-compatible with other PulSAR ADCs?
Yes, the AD7691BCPZRL7 is pin-for-pin compatible with the AD7690 (18-bit, 100 kSPS) and AD7693 (16-bit, 250 kSPS), as explicitly stated in the Features section of the datasheet. This allows drop-in replacement in existing layouts when upgrading resolution or speed-provided the host firmware accommodates the differing throughput and timing parameters.
What digital interface modes does the AD7691BCPZRL7 support?
The AD7691BCPZRL7 supports two primary interface modes: CS mode (3- or 4-wire SPI-compatible) and Chain mode (daisy-chain). Mode selection is determined by the SDI pin state at the CNV rising edge. Both modes are fully SPI/QSPI/MICROWIRE/DSP compatible and support 1.8 V–5 V logic via the VIO supply-documented in the Digital Interface section and Figure 3 through Figure 23 of the datasheet.
What is the power consumption of the AD7691BCPZRL7 at 100 kSPS?
At 100 kSPS, the AD7691BCPZRL7 consumes 1.35 mW when powered from 2.5 V and 4.24 mW when powered from 5 V-values measured under specified conditions (VREF = VDD, T = 25°C) and listed in Table 3 of the Rev. E datasheet. Power scales linearly with throughput, enabling predictable energy budgeting in battery-constrained systems.
AD7691BCPZRL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-VFDFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 18
- 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-LFCSP-WD (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7691BCPZRL7 FAQ
1.How can I place an order for AD7691BCPZRL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7691BCPZRL7 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 AD7691BCPZRL7 reliable?
The price and inventory of AD7691BCPZRL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7691BCPZRL7 is usually 5 days.
3.What payment methods are accepted for AD7691BCPZRL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7691BCPZRL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7691BCPZRL7?
AD7691BCPZRL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7691BCPZRL7 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 AD7691BCPZRL7?
For technical support, including AD7691BCPZRL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7691BCPZRL7 requirements.
6.How does Aetrix verify that AD7691BCPZRL7 is sourced from the original manufacturer or authorized distributors?
All AD7691BCPZRL7 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 AD7691BCPZRL7 meets industry standards.
7.What is the process for return or replacement of AD7691BCPZRL7?
All AD7691BCPZRL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7691BCPZRL7, 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 AD7691BCPZRL7 part is unused and in its original packaging.
Return procedure for AD7691BCPZRL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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