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Analog Devices Inc. AD7887ARMZ
- Part No.:
- AD7887ARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7887ARMZ.pdf
- Description:
- IC ADC 12BIT SAR 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:157
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Product details
Overview
AD7887ARMZ from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC with dual/single-channel operation, 125 kSPS throughput, 2.7 V to 5.25 V single-supply operation, and internal 2.5 V reference. It features SPI/QSPI/MICROWIRE/DSP-compatible serial interface and operates in 8-lead MSOP package for space-constrained battery-powered instrumentation.
For engineers reviewing the AD7887ARMZ datasheet, AD7887ARMZ pinout, AD7887ARMZ application, or AD7887ARMZ equivalent, key selection considerations include its flexible power management (1 μA shutdown), channel configuration via control register, straight binary output coding, and dual-mode analog input range (0–VREF or 0–VDD).
Technical Context
The AD7887ARMZ uses charge-redistribution DAC architecture with track-and-hold acquisition time of 500 ns and full-power bandwidth of 2.5 MHz. Its control register enables software-selectable single/dual-channel mode, reference source (internal 2.5 V or external 1.2 V to VDD), and four power management modes including automatic shutdown post-conversion.
Conversion timing is synchronized to SCLK (up to 2 MHz), requiring 16 clock cycles per transfer: 4 leading zeros + 12-bit MSB-first result on DOUT, clocked on falling edge; control data loaded on DIN at rising edge. Input voltage ranges are strictly defined: 0–VREF in single-channel mode, 0–VDD in dual-channel mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with straight binary output coding and guaranteed no missing codes to 11 bits (B grade) |
| Throughput Rate | 125 kSPS maximum - achieved with 2 MHz SCLK and 16-cycle serial frame (acquisition + conversion) |
| Supply Range | 2.7 V to 5.25 V single supply - supports both 3 V and 5 V system rails without level shifting |
| Power Consumption | 850 μA typical at 125 kSPS (VDD = 5 V); 1 μA max shutdown current - enables multi-year battery life in portable systems |
| Reference Options | Internal 2.5 V ±50 ppm/°C reference or external 1.2 V to VDD - selectable via REF bit in control register |
| Dynamic Performance | 71 dB SNR at 10 kHz input, −80 dB THD - sufficient for precision instrumentation and medical signal acquisition |
| Analog Input Range | 0 to VREF (single-channel) or 0 to VDD (dual-channel) - configurable via SIN/DUAL bit without hardware change |
Pinout & Package
The AD7887ARMZ is housed in an 8-lead MSOP package (3.0 mm × 3.0 mm, 0.65 mm pitch), qualified for automotive applications (−40°C to +125°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select / Shutdown Control | Active-low input that initiates conversion and frames serial data; high state places AD7887ARMZ in shutdown (1 μA) when PM bits select Mode 1 or 3 |
| VDD | Power Supply Input | 2.7 V to 5.25 V single supply; serves as reference source in dual-channel mode |
| GND | Analog Ground Reference | Common ground for all internal circuitry; must connect to AGND plane in mixed-signal layouts |
| AIN1/VREF | Configurable Terminal | In single-channel mode: 2.5 V reference output/input; in dual-channel mode: second analog input (0–VDD range) |
| AIN0 | Analog Input 0 | Primary analog input; range is 0–VREF (single-channel) or 0–VDD (dual-channel) |
| DIN | Serial Data Input | Loads 8-bit control register on SCLK rising edge; tied to GND for read-only single-channel operation |
| DOUT | Serial Data Output | Outputs 16-bit frame (4 zeros + 12-bit result, MSB first) on SCLK falling edge |
| SCLK | Serial Clock Input | Provides clock for serial interface and internal ADC conversion; up to 2 MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Channel Configuration | Software-selectable single/dual-channel mode via control register - eliminates need for hardware variants or BOM splits |
| Ultra-Low Power Management | Four programmable power modes including auto-shutdown after conversion - reduces average current in burst-sampling systems |
| Integrated Reference Architecture | On-chip 2.5 V ±50 ppm/°C reference with external overdrive capability (1.2 V to VDD) - removes external reference IC and saves PCB area |
| SPI-Compatible Serial Interface | MSB-first, 16-cycle frame with simultaneous DIN/DOUT - simplifies microcontroller integration without protocol translation logic |
| High DC Accuracy | ±1 LSB INL (B grade), ±0.5 LSB offset match - enables direct sensor interfacing without calibration in many industrial applications |
Applications
| Portable Medical Instrumentation | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Continuous acquisition of ECG, pulse oximetry, or glucose sensor signals in handheld diagnostic devices. IC Role / Device Role / Timing Role: Primary 12-bit data acquisition front-end with low-noise track-and-hold and internal reference, synchronizing to microcontroller SPI bus. Use Value: 1 μA shutdown current extends battery life beyond 3 years in intermittent-monitoring designs; 71 dB SNR ensures clinical-grade waveform fidelity. | Use Scenario: Analog input conditioning for PLC I/O modules measuring temperature, pressure, or flow transducers. IC Role / Device Role / Timing Role: Dual-channel ADC sampling two independent 4–20 mA loop receivers or RTD bridges with shared serial interface. Use Value: Channel-to-channel isolation >80 dB prevents crosstalk between critical process variables; −40°C to +125°C rating supports harsh factory environments. |
| Battery-Powered Data Loggers | Automotive Body Control Units |
Use Scenario: Long-term environmental monitoring (temperature, humidity, light) in remote field deployments. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at 1–10 Hz, entering shutdown between conversions using Mode 3 power management. Use Value: 3 μW shutdown power dissipation minimizes quiescent drain; internal reference eliminates drift-prone external components in unregulated battery systems. | Use Scenario: Cabin ambient sensing (occupancy, air quality, UV index) in automotive infotainment and HVAC subsystems. IC Role / Device Role / Timing Role: AEC-Q100 qualified ADC interfacing with multiple analog sensors under ISO 16750 electrical stress conditions. Use Value: Qualified for automotive applications per Rev. E datasheet; 2.5 MHz full-power bandwidth supports fast transient detection in occupant classification systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7476ARMZ | Single-channel only; 1 MSPS max; no internal reference; requires external 2.5 V reference | Lacks dual-channel flexibility and reference integration - suitable only where higher speed and external reference are acceptable | Select when throughput >125 kSPS is required and board space allows external reference |
| ADS7822U | 8-bit resolution; 200 kSPS; SPI interface; 2.7–5.25 V supply; no internal reference | Lower resolution and no integrated reference - trades precision for cost and speed in non-critical sensing | Select for cost-sensitive, lower-accuracy applications where 8-bit resolution suffices |
Compared with AD7887ARMZ, AD7476ARMZ offers higher speed but sacrifices dual-channel operation and reference integration, increasing BOM count; ADS7822U provides faster sampling at lower resolution and higher power, making it unsuitable for precision battery-powered use cases where AD7887ARMZ's 12-bit accuracy and micropower shutdown are essential.
Availability
AD7887ARMZ is available at Aetrix Electronics and suitable for portable medical instrumentation, industrial sensor signal conditioning, and battery-powered data loggers requiring stable component supply across extended product lifecycles.
Supply support for AD7887ARMZ 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.
The AD7887ARMZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for low-power, high-accuracy data acquisition in space- and energy-constrained embedded systems.
FAQ
What is the maximum sampling rate supported by the AD7887ARMZ?
The AD7887ARMZ supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK and configured for continuous conversion. This rate is achieved using a 16-clock-cycle serial frame (14.5 cycles conversion + 1.5 cycles acquisition). At lower SCLK frequencies or in power-saving modes (e.g., Mode 3 auto-shutdown), the effective sampling rate decreases proportionally while maintaining full 12-bit accuracy.
Does the AD7887ARMZ require an external reference voltage?
No, the AD7887ARMZ includes an internal 2.5 V reference with ±50 ppm/°C temperature coefficient, accessible via the AIN1/VREF pin in single-channel mode. An external reference (1.2 V to VDD) may be applied to that same pin to override the internal reference. In dual-channel mode, the device uses VDD as the reference source, eliminating need for any external reference component.
How does the AD7887ARMZ handle dual-channel versus single-channel operation?
The AD7887ARMZ configures channel count via the SIN/DUAL bit (Bit 4) in its 8-bit control register. When set to 0, it operates in single-channel mode: AIN0 is active, and AIN1/VREF functions as VREF. When set to 1, it operates in dual-channel mode: both AIN0 and AIN1 accept inputs (0–VDD range), and VDD serves as reference. The CH bit (Bit 3) selects which channel converts next in dual-channel mode.
What power management modes are available on the AD7887ARMZ?
The AD7887ARMZ offers four power management modes controlled by PM1/PM0 bits (Bits 1–0): Mode 1 (CS-gated shutdown), Mode 2 (always-on), Mode 3 (auto-shutdown after conversion), and Mode 4 (standby with reference active). Mode 3 reduces average current significantly in low-duty-cycle applications, while Mode 4 enables faster wake-up than full shutdown - both critical for optimizing energy in battery-powered AD7887ARMZ systems.
Is the AD7887ARMZ compatible with standard microcontroller SPI peripherals?
Yes, the AD7887ARMZ implements an SPI-compatible serial interface: it accepts MSB-first 8-bit control words on DIN (rising SCLK edge) and outputs 16-bit frames (4 zeros + 12-bit result) on DOUT (falling SCLK edge). It supports standard SPI clock polarity and phase configurations and is explicitly documented as compatible with SPI, QSPI, MICROWIRE, and DSP interfaces - enabling direct connection to most ARM Cortex-M, PIC, and MSP430 microcontrollers without glue logic.
AD7887ARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 1, 2
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 8-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7887ARMZ FAQ
1.How can I place an order for AD7887ARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887ARMZ 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 AD7887ARMZ reliable?
The price and inventory of AD7887ARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887ARMZ is usually 5 days.
3.What payment methods are accepted for AD7887ARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887ARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887ARMZ?
AD7887ARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887ARMZ 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 AD7887ARMZ?
For technical support, including AD7887ARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887ARMZ requirements.
6.How does Aetrix verify that AD7887ARMZ is sourced from the original manufacturer or authorized distributors?
All AD7887ARMZ 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 AD7887ARMZ meets industry standards.
7.What is the process for return or replacement of AD7887ARMZ?
All AD7887ARMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7887ARMZ, 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 AD7887ARMZ part is unused and in its original packaging.
Return procedure for AD7887ARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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