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Analog Devices Inc. AD7887AR
- Part No.:
- AD7887AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7887AR.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,182
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Product details
Overview
AD7887AR from Analog Devices is a micropower, 12-bit successive approximation register (SAR) ADC supporting dual- or single-channel operation, 125 kSPS throughput, 2.7 V to 5.25 V single-supply operation, and straight binary output coding - deployed in battery-powered medical instruments and portable instrumentation.
For engineers reviewing the AD7887AR datasheet, AD7887AR pinout, AD7887AR application, or AD7887AR equivalent, key selection considerations include its flexible power management (1 μA shutdown), dual-mode analog input configuration (0–VREF or 0–VDD), SPI/QSPI/MICROWIRE-compatible serial interface, and 8-lead MSOP package footprint.
Technical Context
The AD7887AR implements a charge-redistribution DAC architecture with integrated track-and-hold, acquiring signals in 500 ns and supporting full-power input bandwidth up to 2.5 MHz. Its control logic enables software-configurable operation via an 8-bit write-only register that selects single/dual channel mode, reference source (internal 2.5 V or external 1.2–VDD), and one of four power management modes.
Channel isolation is −80 dB at 25 kHz, and dynamic performance includes 71 dB SNR, −80 dB THD, and −80 dB IMD (second- and third-order) at 10 kHz input and 125 kSPS sampling - all specified across −40°C to +125°C for automotive-qualified operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR ADC with straight binary output - delivers 4096 discrete levels and LSB = VREF/4096 for precise amplitude quantization. |
| Throughput Rate | 125 kSPS maximum - achieved with 2 MHz SCLK; conversion time + acquisition = 16 SCLK cycles (7.25 μs). |
| Supply Range | 2.7 V to 5.25 V single supply - supports direct integration into 3 V and 5 V systems without level-shifting. |
| Power Consumption | 850 μA typical at 125 kSPS (3.5 mW @ 5 V); drops to 1 μA max in shutdown - enables >1-year battery life in low-duty-cycle sensing. |
| Analog Input Range | Configurable: 0 to VREF (single-channel, VREF = 1.2–VDD) or 0 to VDD (dual-channel) - simplifies sensor interfacing across voltage domains. |
| Reference Source | Internal 2.5 V ±50 ppm/°C reference or external reference on AIN1/VREF pin - eliminates need for external reference IC in space-constrained designs. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP-compatible - interoperates with common microcontrollers without protocol translation hardware. |
Pinout & Package
AD7887AR is housed in an 8-lead, 0.15-inch-wide MSOP package (3.0 mm × 3.0 mm, 0.8 mm height), RoHS-compliant and qualified for automotive applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select / Shutdown Control | Active-low input initiating conversion and framing serial data; doubles as hardware shutdown pin - enables immediate power-down on CS high in Mode 1. |
| VDD | Power Supply Input | Single 2.7–5.25 V supply; serves as reference source in dual-channel mode - eliminates separate reference rail in 0–VDD input configurations. |
| GND | Analog Ground Reference | Common AGND tie point for internal circuitry; requires low-impedance connection to system analog ground plane to minimize noise coupling. |
| AIN1/VREF | Configurable Terminal | In single-channel mode: 2.5 V reference output or external reference input (1.2–VDD); in dual-channel mode: second analog input (0–VDD range). |
| AIN0 | Analog Input 0 | Primary analog input with 0–VREF (single) or 0–VDD (dual) range; 20 pF input capacitance and ±5 μA leakage - compatible with passive RC anti-aliasing filters. |
| DIN | Serial Data Input | Control register loading input (MSB-first); tied to GND for read-only single-channel operation - reduces GPIO count in simple monitoring applications. |
| DOUT | Serial Data Output | 16-bit frame (4 leading zeros + 12-bit result) clocked on SCLK falling edge - supports daisy-chaining and synchronous sampling with multiple ADCs. |
| SCLK | Serial Clock Input | Master clock for both data transfer and internal conversion timing; 2 MHz max frequency - defines maximum sample rate and timing margins. |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Channel Configuration | Software-selectable single- or dual-channel mode via control register - eliminates hardware redesign when adding secondary sensor inputs. |
| Ultra-Low Power Shutdown | 1 μA max shutdown current (VDD = 2.7–3.6 V) - extends battery life in intermittent-sampling applications such as wearable health monitors. |
| Integrated Reference | On-chip 2.5 V ±50 ppm/°C reference with buffered output - removes external reference component and associated layout area in cost-sensitive designs. |
| Read-Only Operation Mode | DIN permanently grounded enables single-channel use without microcontroller firmware overhead - ideal for fixed-function sensor nodes. |
| High Channel Isolation | −80 dB channel-to-channel isolation at 25 kHz - ensures accurate simultaneous measurement of independent analog sources without crosstalk. |
Applications
| Portable Medical Instrumentation | Battery-Powered PDA Sensors |
|---|---|
|
Use Scenario: Continuous glucose monitor acquiring analog signals from electrochemical biosensors at 10–50 kSPS. IC Role / Device Role / Timing Role: 12-bit SAR ADC digitizing low-current sensor outputs with 2.5 MHz full-power bandwidth and minimal power draw. Use Value: Enables 3+ year coin-cell operation via 1 μA shutdown and configurable throughput scaling - meets ISO 13485 portable device longevity requirements. |
Use Scenario: Touch-screen controller in handheld PDA reading resistive touch panel voltages under variable lighting and temperature. IC Role / Device Role / Timing Role: Dual-channel ADC sampling X/Y electrode pairs sequentially with <500 ns acquisition and auto power-down between conversions. Use Value: Eliminates external reference and reduces BOM count by integrating 2.5 V reference - critical for sub-10 mm² PCB real estate constraints. |
| Industrial Process Monitoring | Automotive Cabin Sensor Hub |
|
Use Scenario: Remote temperature/humidity node in factory automation using thermistor and capacitive humidity sensors. IC Role / Device Role / Timing Role: Single-channel ADC operating in read-only mode (DIN = GND) with internal reference, converting two analog inputs alternately. Use Value: Supports −40°C to +125°C operation and achieves 71 dB SNR at 10 kHz - ensures reliable readings despite EMI-rich industrial environments. |
Use Scenario: Occupancy detection module in automotive cabin using IR proximity and ambient light sensors. IC Role / Device Role / Timing Role: Dual-channel ADC sampling IR diode and photodiode outputs simultaneously with 0–VDD input range and SPI interface to MCU. Use Value: AEC-Q100 qualified MSOP package and −80 dB channel isolation prevent false triggers from shared power rails - satisfies ASIL-B functional safety alignment. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 200 kSPS, 2.7–5.5 V supply, no internal reference - requires external REF. | Lower resolution limits dynamic range in precision medical sensing; higher speed suits fast-response industrial controls. | Select ADS7822U only when 8-bit accuracy suffices and external reference is already present in design. |
| MAX11100ETE+ | 12-bit, 250 kSPS, internal 4.096 V reference, 10-lead TDFN - different pinout and higher supply current (1.2 mA active). | Higher speed and fixed 4.096 V reference simplify calibration but increase power - unsuitable for ultra-low-power battery designs. | Choose MAX11100ETE+ when 250 kSPS throughput is mandatory and board space allows 10-lead package. |
Compared with ADS7822U and MAX11100ETE+, the AD7887AR uniquely balances 12-bit precision, 125 kSPS throughput, 1 μA shutdown, and integrated 2.5 V reference in an 8-lead MSOP - making it optimal for space- and power-constrained dual-sensor systems requiring automotive qualification.
Availability
AD7887AR is available at Aetrix Electronics and suitable for portable medical instrumentation, battery-powered PDAs, industrial process monitoring, and automotive cabin sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7887AR 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7887AR belongs to Analog Devices' micropower SAR ADC product line, engineered for ultra-low-power, high-accuracy data acquisition in battery-operated and automotive-qualified systems.
FAQ
What is the maximum sampling rate supported by the AD7887AR?
The AD7887AR achieves a maximum throughput rate of 125 kSPS when operated with a 2 MHz serial clock. This rate is fixed by its internal architecture: conversion time plus acquisition time equals exactly 16 SCLK cycles (7.25 μs at 2 MHz). Attempting higher SCLK frequencies violates timing specifications and risks data corruption. The AD7887AR datasheet confirms this value across both A and B grade versions at −40°C to +125°C.
Does the AD7887AR require an external reference voltage?
No, the AD7887AR does not require an external reference voltage. It integrates a 2.5 V ±50 ppm/°C internal reference accessible via the AIN1/VREF pin in single-channel mode. When external referencing is needed, the same pin accepts 1.2 V to VDD - but the AD7887AR functions fully with its internal reference enabled (REF bit = 0), eliminating BOM cost and layout complexity.
Can the AD7887AR operate in single-channel mode without a microcontroller?
Yes, the AD7887AR supports true read-only single-channel operation. By tying the DIN pin permanently to GND, the device defaults to single-channel mode with AIN0 as the sole input and internal reference active. All control bits retain default values (0x00), and conversion results stream continuously on DOUT - enabling standalone analog digitization in fixed-function sensor modules without firmware.
What power management modes are available on the AD7887AR?
The AD7887AR offers four programmable power management modes controlled by PM1/PM0 bits: Mode 1 (hardware shutdown on CS high), Mode 2 (always-on), Mode 3 (auto-shutdown after each conversion), and Mode 4 (standby with reference active). Mode 3 reduces average current to 12 μA at 1 kSPS, while Mode 1 achieves 1 μA shutdown - both validated in the AD7887AR datasheet Rev. E Tables 1 and 6.
Is the AD7887AR pin-compatible with other 8-lead ADCs from Analog Devices?
No, the AD7887AR has a unique 8-pin MSOP pinout optimized for dual-channel/single-channel flexibility: AIN1/VREF serves dual roles, and CS doubles as shutdown control. It is not pin-compatible with AD7476A, AD7274, or AD7888 - each uses distinct pin assignments for reference, input, and serial interface. Board-level replacement requires schematic and layout revision.
AD7887AR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7887AR FAQ
1.How can I place an order for AD7887AR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7887AR 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 AD7887AR reliable?
The price and inventory of AD7887AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7887AR is usually 5 days.
3.What payment methods are accepted for AD7887AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7887AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7887AR?
AD7887AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7887AR 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 AD7887AR?
For technical support, including AD7887AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7887AR requirements.
6.How does Aetrix verify that AD7887AR is sourced from the original manufacturer or authorized distributors?
All AD7887AR 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 AD7887AR meets industry standards.
7.What is the process for return or replacement of AD7887AR?
All AD7887AR units undergo pre-shipment inspection (PSI). If there is an issue with AD7887AR, 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 AD7887AR part is unused and in its original packaging.
Return procedure for AD7887AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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