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Analog Devices Inc. AD7888BRZ-REEL7
- Part No.:
- AD7888BRZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7888BRZ-REEL7.pdf
- Description:
- AD7888BRZ-REEL7
- Quantity:
- Payment:
- Shipping:
Inventory:3,213
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Product details
Overview
AD7888BRZ-REEL7 from Analog Devices is a micropower, 12-bit, 8-channel successive-approximation ADC operating from a single 2.7 V to 5.25 V supply, delivering 125 kSPS throughput with 500 ns track/hold acquisition time and integrated 2.5 V reference. It features SPI/QSPI/MICROWIRE/DSP-compatible serial interface and eight single-ended analog inputs (AIN1–AIN8), targeting battery-powered instrumentation and portable medical devices.
For engineers reviewing the AD7888BRZ-REEL7 datasheet, AD7888BRZ-REEL7 pinout, AD7888BRZ-REEL7 application, or AD7888BRZ-REEL7 equivalent, key selection considerations include its 12-bit resolution with ±1 LSB DNL (B-grade), 71 dB SNR at 10 kHz, flexible power management (shutdown current ≤1 µA at 2.7–3.6 V), TSSOP-16 package footprint, and support for internal or external 1.2 V–VDD reference.
Technical Context
The AD7888BRZ-REEL7 implements a charge redistribution SAR architecture with on-chip track-and-hold, 8:1 analog multiplexer, and programmable power modes (Normal, Full Shutdown, Autoshutdown, Autostandby). Its conversion timing is synchronized to SCLK, requiring 16 clock cycles per conversion (14.5 for conversion + 1.5 for acquisition) at up to 2 MHz.
It supports straight binary output coding, 0 V to VREF input range, and configurable reference sourcing via REF bit in an 8-bit write-only control register. Channel selection is determined by ADD2–ADD0 bits, and digital I/O complies with 2.1 V/0.8 V logic thresholds across its full supply range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels with guaranteed no missing codes (B grade) |
| Throughput Rate | 125 kSPS - enables real-time sampling of signals up to 2.5 MHz full-power bandwidth |
| Supply Voltage | 2.7 V to 5.25 V - supports direct integration into 3 V and 5 V systems without level-shifting |
| Reference | Internal 2.5 V ±50 ppm/°C or external 1.2 V to VDD - allows precision scaling or system-level reference sharing |
| Power Consumption | 700 µA typical (normal mode), 1 µA max (shutdown, 2.7–3.6 V) - extends battery life in portable applications |
| SNR / THD | 71 dB / –80 dB at 10 kHz - meets requirements for high-fidelity signal capture in medical and test equipment |
| Input Channels | 8 single-ended (AIN1–AIN8) - reduces external multiplexing complexity in multi-sensor monitoring systems |
Pinout & Package
AD7888BRZ-REEL7 is housed in a 16-lead thin shrink small outline package (TSSOP), 5.0 mm × 4.4 mm × 1.2 mm body, with 0.65 mm lead pitch and exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low frame signal initiating conversion and serial data transfer; must be held low for full 16-SCLK cycle |
| REF IN/REF OUT | Reference I/O | Provides access to internal 2.5 V reference or accepts external 1.2 V–VDD reference; impedance ~5 kΩ when enabled, >1 GΩ when disabled |
| VDD | Power Supply | Single analog/digital supply input; powers all internal circuitry including reference and logic |
| AGND (Pins 4, 13) | Analog Ground | Dedicated low-noise return path for analog inputs, reference, and internal converter; both pins must connect to system AGND plane |
| AIN1–AIN8 (Pins 5–12) | Analog Inputs | Eight single-ended channels with 0–VREF range; unused channels must tie to AGND to prevent noise coupling |
| DIN | Serial Data Input | Loads 8-bit control register on rising SCLK edges; shares bus with DOUT during full 16-bit transaction |
| DOUT | Serial Data Output | Outputs 16-bit word: four leading zeros + 12-bit MSB-first result; driven on falling SCLK edge |
| SCLK | Serial Clock | Master clock for control register loading, result readout, and internal conversion timing; max 2 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Power Management | Four selectable modes (Normal, Full Shutdown, Autoshutdown, Autostandby) enable dynamic trade-off between speed and µA-level quiescent current |
| On-Chip 2.5 V Reference | ±50 ppm/°C tempco and 2.45–2.55 V output tolerance allow stable conversions without external reference components |
| High Channel Isolation | –80 dB typical channel-to-channel crosstalk at 25 kHz ensures accurate simultaneous multi-sensor measurements |
| SPI-Compatible Serial Interface | Native support for SPI/QSPI/MICROWIRE/DSP protocols simplifies host MCU integration without protocol translation logic |
| Low Input Capacitance in Hold Mode | 4 pF typical hold-mode input capacitance minimizes charge injection errors during sampling |
Applications
| Portable Medical Monitors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, temperature, and SpO₂ sensor outputs in handheld patient monitors. IC Role / Device Role / Timing Role: Central 8-channel analog front-end digitizing multiple physiological signals with synchronized sampling and low-latency serial output. Use Value: 125 kSPS throughput and 71 dB SNR ensure diagnostic-grade waveform fidelity; 1 µA shutdown current extends battery runtime beyond 72 hours on coin-cell power. | Use Scenario: Long-term environmental sensing (temperature, humidity, pressure) in remote field deployments. IC Role / Device Role / Timing Role: Low-power analog acquisition node interfacing passive sensors to ultra-low-power microcontrollers via SPI. Use Value: Autoshutdown mode reduces average current to <5 µA at 1 kSPS, enabling multi-year operation on primary lithium batteries. |
| Industrial Handheld Testers | Wireless Sensor Nodes |
Use Scenario: Multi-point voltage/current measurement in portable multimeters and insulation testers. IC Role / Device Role / Timing Role: Precision 12-bit digitizer with internal reference and 8:1 mux eliminating need for external precision references or analog switches. Use Value: ±1 LSB DNL (B grade) and ±2 LSB INL guarantee measurement repeatability; TSSOP-16 footprint saves PCB area vs. legacy SOIC alternatives. | Use Scenario: Edge-node condition monitoring in predictive maintenance systems using vibration, acoustic, and thermal sensors. IC Role / Device Role / Timing Role: High-fidelity signal capture engine feeding FFT-based analysis firmware running on Cortex-M0+ MCUs. Use Value: 2.5 MHz full-power bandwidth and –78 dB IMD support accurate spectral analysis of mechanical fault frequencies up to 100 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 8-channel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, 2.7–5.25 V, but only 4 single-ended channels; no internal reference; MSOP-8 package | Limited channel count requires external mux for 8-channel use; higher throughput suits faster control loops | Select when board space is critical and channel expansion is handled externally |
| MAX11131ETE+ | 12-bit, 500 kSPS, 2.7–3.6 V only; integrated reference; 16-pin TQFN; SPI-only interface | Higher speed and smaller TQFN package, but incompatible with 5 V systems and lacks QSPI/MICROWIRE support | Select for 3 V-only designs needing maximum sample rate and minimal footprint |
Compared with ADS7822U and MAX11131ETE+, AD7888BRZ-REEL7 uniquely balances 8-channel integration, internal reference flexibility, 5 V compatibility, and sub-µA shutdown-making it optimal for dual-voltage portable instrumentation where channel density and power efficiency are co-prioritized.
Availability
AD7888BRZ-REEL7 is available at Aetrix Electronics and suitable for battery-powered medical instruments, industrial handheld testers, and wireless sensor nodes requiring stable component supply, long-lifecycle availability, and RoHS-compliant packaging.
Supply support for AD7888BRZ-REEL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and healthcare markets.
The AD7888BRZ-REEL7 belongs to Analog Devices' precision SAR ADC product line, engineered specifically for space-constrained, battery-operated systems demanding high resolution, low power, and robust serial interface compatibility.
FAQ
What is the guaranteed differential nonlinearity (DNL) specification for AD7888BRZ-REEL7?
The AD7888BRZ-REEL7 is the B-grade version of the AD7888, with guaranteed differential nonlinearity of –1/+1.5 LSB maximum across temperature. This ensures no missing codes over the full 12-bit range and supports high-accuracy measurement applications such as medical diagnostics and precision data logging where code consistency is critical. The DNL value is validated per Analog Devices' Rev. C datasheet specifications.
Does AD7888BRZ-REEL7 support external reference voltages, and what is the valid input range?
Yes, AD7888BRZ-REEL7 supports external reference voltages applied to the REF IN/REF OUT pin. The valid range is 1.2 V to VDD, accommodating both 2.5 V and 3.3 V system references. When an external reference is used, the internal 2.5 V reference must be disabled via the REF bit (bit 2) in the control register to achieve optimal performance and avoid conflict. The input impedance exceeds 1 GΩ in this configuration.
What is the minimum wake-up time required after issuing a shutdown command to AD7888BRZ-REEL7?
The AD7888BRZ-REEL7 requires 5 µs to wake up from full shutdown mode before a valid conversion can be initiated. This timing is specified in the "Power-Up Time from Shutdown" parameter (t9) of the datasheet and applies when exiting Full Shutdown (PM1=0, PM0=1) or Autoshutdown (PM1=1, PM0=0) modes. During this interval, CS must remain high and SCLK inactive until the 5 µs elapses.
How many analog input channels does AD7888BRZ-REEL7 provide, and what type are they?
AD7888BRZ-REEL7 provides eight single-ended analog input channels labeled AIN1 through AIN8. Each channel accepts signals from 0 V to VREF, and channel selection is controlled by the ADD2–ADD0 bits in the 8-bit control register. Unused channels must be tied to AGND to prevent noise pickup and maintain channel-to-channel isolation of –80 dB typical at 25 kHz.
Which serial interface protocols is AD7888BRZ-REEL7 compatible with?
AD7888BRZ-REEL7 is compatible with SPI™, QSPI™, MICROWIRE™, and DSP serial interface protocols. Its DIN/DOUT/SCLK/CS pinout and timing behavior-including MSB-first 16-bit frame format (four leading zeros + 12-bit result), 2 MHz max SCLK, and CS-framed transactions-meet the electrical and protocol requirements of all four standards without hardware modification.
AD7888BRZ-REEL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 125k
- Number of Inputs:
- 8
- 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 ~ 105°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7888BRZ-REEL7 FAQ
1.How can I place an order for AD7888BRZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7888BRZ-REEL7 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 AD7888BRZ-REEL7 reliable?
The price and inventory of AD7888BRZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7888BRZ-REEL7 is usually 5 days.
3.What payment methods are accepted for AD7888BRZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7888BRZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7888BRZ-REEL7?
AD7888BRZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7888BRZ-REEL7 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 AD7888BRZ-REEL7?
For technical support, including AD7888BRZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7888BRZ-REEL7 requirements.
6.How does Aetrix verify that AD7888BRZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All AD7888BRZ-REEL7 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 AD7888BRZ-REEL7 meets industry standards.
7.What is the process for return or replacement of AD7888BRZ-REEL7?
All AD7888BRZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD7888BRZ-REEL7, 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 AD7888BRZ-REEL7 part is unused and in its original packaging.
Return procedure for AD7888BRZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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