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Analog Devices Inc. AD7888BRZ
- Part No.:
- AD7888BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7888BRZ.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,109
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Product details
Overview
AD7888BRZ 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; used in battery-powered medical instruments and portable instrumentation for high-resolution analog signal digitization.
For engineers reviewing the AD7888BRZ datasheet, AD7888BRZ pinout, AD7888BRZ application, or AD7888BRZ equivalent, key selection considerations include its 12-bit resolution with ±1 LSB DNL (B-grade), SPI/QSPI/MICROWIRE-compatible serial interface, 16-lead TSSOP package, and flexible power management supporting 1 µA shutdown current at 1 kSPS.
Technical Context
The AD7888BRZ implements a charge redistribution SAR architecture with on-chip track-and-hold, enabling full-power signal conversion up to 2.5 MHz bandwidth. Its control logic manages multiplexer selection (AIN1–AIN8), reference configuration (internal 2.5 V or external 1.2 V–VDD), and three power modes via PM1/PM0 bits.
Serial communication uses a 16-clock cycle frame: first 8 rising SCLK edges load the 8-bit control register (ADD2–ADD0, REF, PM1/PM0), while the next 8 falling edges output 4 leading zeros followed by 12-bit MSB-first conversion data on DOUT, synchronized to DIN input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for precise analog measurement |
| Throughput Rate | 125 kSPS - supports real-time sampling of signals up to 2.5 MHz full-power bandwidth |
| Supply Voltage | 2.7 V to 5.25 V - enables direct operation from Li-ion, 3.3 V, or 5 V rails without regulation |
| Reference | Internal 2.5 V ±50 ppm/°C or external 1.2 V–VDD - allows system-level reference sharing or precision calibration |
| Power Consumption | 2 mW typical at 5 V / 125 kSPS; 3 µW in shutdown - extends battery life in portable systems |
| Channel Count | 8 single-ended inputs (AIN1–AIN8) - reduces board space vs. multiple single-channel ADCs |
| Interface | SPI/QSPI/MICROWIRE/DSP-compatible - interoperates with common microcontroller peripherals |
Pinout & Package
AD7888BRZ is housed in a 16-lead thin shrink small outline package (TSSOP), 5.0 mm × 4.4 mm × 1.2 mm body height, with exposed pad not electrically connected. Pin 1 is marked by a dot or beveled corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low frame sync: initiates conversion and defines 16-clock serial transaction window |
| 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 |
| VDD | Power Supply | Single 2.7–5.25 V supply powering analog and digital sections; decoupling required at pin |
| AGND (Pins 4, 13) | Analog Ground | Common return for all analog circuitry; must connect to clean analog ground plane, separate from digital ground |
| AIN1–AIN8 (Pins 5–12) | Analog Inputs | Single-ended channels with 0–VREF range; unused inputs must tie to AGND to prevent noise coupling |
| DIN | Data Input | Loads Control Register bits (ADD2–ADD0, REF, PM1/PM0) on rising SCLK edges |
| DOUT | Data Output | Outputs 16-bit frame: 4 leading zeros + 12-bit MSB-first result on falling SCLK edges |
| SCLK | Serial Clock | Master clock for both serial I/O and internal SAR conversion timing; max 2 MHz |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Power Management | Four selectable modes (Normal, Full Shutdown, Autoshutdown, Autostandby) controlled via PM1/PM0 bits, enabling <1 µA shutdown current |
| On-Chip Reference | 2.5 V ±50 ppm/°C reference with user-selectable enable/disable via REF bit; supports external overdrive from 1.2 V to VDD |
| High Channel Isolation | –80 dB channel-to-channel isolation at 25 kHz ensures accurate multi-channel measurements without crosstalk |
| Low THD & High SNR | –80 dB THD and 71 dB SNR at 10 kHz input enable high-fidelity signal capture in instrumentation |
| Fast Track/Acquisition | 500 ns acquisition time allows accurate sampling of fast transients and high-frequency signals |
Applications
| Portable Medical Monitoring | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, temperature, and oxygen saturation signals in handheld patient monitors. IC Role / Device Role / Timing Role: 12-bit ADC digitizing eight physiological sensor outputs with low power consumption and stable internal reference. Use Value: Enables >100-hour battery life at 125 kSPS while maintaining ±1 LSB DNL accuracy across –40°C to +105°C. | Use Scenario: Field-deployed environmental sensors logging temperature, humidity, and pressure over weeks on coin-cell batteries. IC Role / Device Role / Timing Role: Low-quiescent-current ADC performing burst-mode sampling with autoshutdown between readings. Use Value: Reduces average current to <1 µA during idle periods using programmable power-down, extending operational lifetime. |
| Industrial Process Controllers | High-Speed Modem Front Ends |
Use Scenario: Real-time monitoring of motor current, voltage, and thermal feedback in PLC I/O modules. IC Role / Device Role / Timing Role: 8-channel multiplexed ADC interfacing to isolated analog inputs with SPI-compatible host MCU communication. Use Value: Eliminates need for external multiplexer and reference IC, reducing BOM count and PCB area in compact enclosures. | Use Scenario: Digitizing baseband analog signals in DSL or cable modem line cards requiring wide dynamic range. IC Role / Device Role / Timing Role: High-SNR ADC capturing 2.5 MHz full-power bandwidth signals with minimal harmonic distortion. Use Value: Achieves 71 dB SNR and –80 dB THD at 10 kHz, supporting high-order QAM modulation schemes. |
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-channel; no internal reference; requires external REF | Lower channel count limits multi-sensor use; higher throughput suits faster control loops | Select when higher speed is critical and channel count can be reduced or external mux added |
| MAX11131ETE+ | 12-bit, 500 kSPS, 2.7–3.6 V only; integrated reference; 10-pin TDFN package | Narrower supply range; smaller footprint but no 5 V compatibility or 8-channel support | Select for ultra-compact 3.3 V systems where size outweighs voltage flexibility and channel count |
Compared with ADS7822U and MAX11131ETE+, the AD7888BRZ uniquely combines 8-channel count, internal 2.5 V reference, 5 V supply tolerance, and sub-µA shutdown-making it optimal for space-constrained, multi-sensor battery-powered designs requiring broad voltage operation.
Availability
AD7888BRZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable instrumentation, and industrial process controllers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for AD7888BRZ 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, headquartered in Norwood, MA.
The AD7888BRZ belongs to Analog Devices' precision SAR ADC product line, engineered for low-power, multi-channel data acquisition in portable and embedded systems where accuracy, size, and energy efficiency are critical.
FAQ
What is the maximum sampling rate supported by the AD7888BRZ?
The AD7888BRZ supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK across its full 2.7 V to 5.25 V supply range. This rate is achieved with a fixed 16 SCLK-cycle conversion time (14.5 cycles for conversion + 1.5 for acquisition), making timing deterministic and easy to integrate with microcontroller SPI peripherals.
Does the AD7888BRZ include an internal voltage reference?
Yes, the AD7888BRZ integrates a 2.5 V ±50 ppm/°C internal reference accessible via the REF IN/REF OUT pin. The reference can be enabled or disabled using the REF bit in the control register. When disabled, the pin presents >1 GΩ input impedance, allowing seamless use of an external reference from 1.2 V to VDD.
What power management modes does the AD7888BRZ support?
The AD7888BRZ supports four power modes controlled by PM1/PM0 bits: Normal Operation (full power), Full Shutdown (<2 µA), Autoshutdown (enters shutdown after each conversion, 5 µs wake-up), and Autostandby (partial shutdown with reference active). These modes allow dynamic adaptation to throughput requirements while minimizing average current.
How many analog input channels does the AD7888BRZ have, and what is their configuration?
The AD7888BRZ features eight single-ended analog input channels (AIN1 through AIN8), selected via ADD2–ADD0 bits in the control register. Each channel accepts signals from 0 V to VREF. Unused channels must be tied to AGND to prevent noise injection and ensure specified channel-to-channel isolation of –80 dB at 25 kHz.
Is the AD7888BRZ pin-compatible with other members of the AD78xx family?
No, the AD7888BRZ is not pin-compatible with earlier AD78xx-series ADCs such as AD782x or AD781x devices. Its 16-lead TSSOP pinout-including dual AGND pins, dedicated REF IN/REF OUT, and specific DIN/DOUT/SCLK/CS placement-is unique to the AD7888 family and optimized for 8-channel multiplexing and low-power serial interface.
AD7888BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7888BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7888BRZ 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 reliable?
The price and inventory of AD7888BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7888BRZ is usually 5 days.
3.What payment methods are accepted for AD7888BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7888BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7888BRZ?
AD7888BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7888BRZ 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?
For technical support, including AD7888BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7888BRZ requirements.
6.How does Aetrix verify that AD7888BRZ is sourced from the original manufacturer or authorized distributors?
All AD7888BRZ 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 meets industry standards.
7.What is the process for return or replacement of AD7888BRZ?
All AD7888BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7888BRZ, 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 part is unused and in its original packaging.
Return procedure for AD7888BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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