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Analog Devices Inc. AD7888BR-REEL
- Part No.:
- AD7888BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7888BR-REEL.pdf
- Description:
- IC ADC 12BIT SAR 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,477
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Product details
Overview
AD7888BR-REEL from Analog Devices is a micropower, 12-bit, 8-channel successive-approximation ADC with serial SPI/QSPI/MICROWIRE/DSP-compatible interface, operating from 2.7 V to 5.25 V single supply and delivering 125 kSPS throughput. It features an on-chip 2.5 V reference, 8 single-ended analog inputs (AIN1–AIN8), and 16-lead TSSOP packaging - optimized for battery-powered instrumentation and portable medical devices.
For engineers reviewing the AD7888BR-REEL datasheet, AD7888BR-REEL pinout, AD7888BR-REEL application, or AD7888BR-REEL equivalent, key selection criteria include its 125 kSPS conversion rate, ±1 LSB differential nonlinearity (B-grade), 71 dB SNR at 10 kHz, flexible power management (shutdown current ≤1 µA at 2.7 V), and 38 pF analog input capacitance in track mode.
Technical Context
The AD7888BR-REEL implements a charge redistribution SAR architecture with integrated track-and-hold, enabling full-power signal acquisition up to 2.5 MHz bandwidth. Its control logic manages channel selection via 3-bit ADD[2:0] in an 8-bit write-only register and supports four power modes (normal, full shutdown, autoshutdown, autostandby) through PM1/PM0 bits.
It uses a 2.5 V internal reference (±50 ppm/°C tempco) accessible at REF IN/REF OUT, which can be disabled to accept external references from 1.2 V to VDD. Serial communication occurs over CS/SCLK/DIN/DOUT with MSB-first 16-bit frames (4 leading zeros + 12-bit result), synchronized to SCLK rising/falling edges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels with straight binary coding; LSB = VREF/4096. |
| Throughput Rate | 125 kSPS - achieved with 2 MHz SCLK; total conversion + acquisition time = 16 SCLK cycles (7.25 µs). |
| Differential Nonlinearity | –1/+1.5 LSB max (B grade) - guarantees no missing codes across full 12-bit range. |
| SNR | 71 dB typ at fIN = 10 kHz - enables high-fidelity digitization of audio-band and sensor signals. |
| Supply Current (Shutdown) | 1 µA max at VDD = 2.7 V to 3.6 V - supports ultra-low-power sleep states in portable systems. |
| Analog Input Range | 0 V to VREF - supports single-ended inputs referenced to internal 2.5 V or external 1.2 V–VDD sources. |
| Channel Count | 8 single-ended inputs (AIN1–AIN8) - selected via 3-bit address in control register; default = AIN1 on power-up. |
Pinout & Package
AD7888BR-REEL is housed in a 16-lead thin shrink small outline package (TSSOP), 4.4 mm × 5.0 mm × 1.2 mm body size, with 0.65 mm lead pitch and exposed pad not present. Pin 1 is marked by a dot or bevelled corner; pins are numbered counterclockwise from top-left when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low enable for conversion initiation and serial frame synchronization; must be held low for entire 16-clock transaction. |
| 2 (REF IN/REF OUT) | Reference I/O | Provides access to internal 2.5 V reference or accepts external 1.2 V–VDD reference; input impedance = 5 kΩ (ref enabled) or >1 GΩ (ref disabled). |
| 3 (VDD) | Power Supply | Single 2.7 V–5.25 V analog/digital supply; powers all internal circuitry including reference and digital core. |
| 4, 13 (AGND) | Analog Ground | Dedicated low-noise ground return for analog inputs, reference, and internal ADC; both pins must connect to system AGND plane. |
| 5–12 (AIN1–AIN8) | Analog Inputs | Eight single-ended channels; input leakage ≤±1 µA, capacitance = 38 pF (track) / 4 pF (hold); unused channels must tie to AGND. |
| 14 (DIN) | Data Input | Serial control register load path; 8-bit command (ADD2–ADD0, REF, PM1/PM0) clocked on SCLK rising edge. |
| 15 (DOUT) | Data Output | 12-bit conversion result + 4 leading zeros, MSB-first, clocked out on SCLK falling edge; tri-state when CS high. |
| 16 (SCLK) | Serial Clock | Master clock for both serial interface and internal SAR conversion timing; 2 MHz max frequency supports 125 kSPS. |
Key Features
| Feature | Design Value |
|---|---|
| Smallest 12-bit 8-channel ADC footprint | 16-lead TSSOP occupies same PCB area as 8-lead SOIC - reduces layout space by >50% vs. legacy alternatives. |
| Lowest power consumption in class | 3 µW shutdown power dissipation at 3 V - extends battery life in PDA, glucose meter, and wearable sensor nodes. |
| Flexible power management | Four selectable modes (normal, full shutdown, autoshutdown, autostandby) programmable via control register - enables dynamic power scaling per sampling interval. |
| Versatile serial interface | SPI/QSPI/MICROWIRE/DSP compatibility eliminates need for protocol translation logic in microcontroller-based systems. |
| On-chip 2.5 V reference with external override | Internal reference usable directly or disabled to accept precision external sources - simplifies BOM and improves system-level accuracy control. |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous vital sign monitoring (ECG, SpO₂, temperature) in handheld patient monitors with 24+ hour battery life. IC Role / Device Role / Timing Role: 12-bit analog front-end digitizer for multiplexed sensor signals; performs 125 kSPS conversions with <5 µs wake-up from autoshutdown between samples. Use Value: 1 µA shutdown current at 3 V and 38 pF input capacitance minimize loading on high-impedance biopotential sensors while maintaining SNR >70 dB. |
Use Scenario: Environmental parameter logging (temperature, humidity, pressure) in remote field sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-power multiplexed ADC managing eight analog sensor outputs; configured in autoshutdown mode to draw <1 µA between periodic 10-second measurements. Use Value: On-chip 2.5 V reference eliminates external voltage reference IC, reducing component count and board area without sacrificing 12-bit linearity (±1 LSB DNL). |
| Industrial Process Control Sensors | High-Speed Modem Analog Front Ends |
|
Use Scenario: Distributed I/O modules acquiring thermocouple, RTD, and 4–20 mA loop signals in factory automation cabinets. IC Role / Device Role / Timing Role: Precision 12-bit digitizer supporting 0–VREF input range; uses external 2.5 V reference for improved PSRR (–85 dB typical) against noisy 24 V supply rails. Use Value: Channel-to-channel isolation >80 dB prevents crosstalk between simultaneously sampled analog inputs, ensuring accurate multi-sensor correlation. |
Use Scenario: Baseband signal conditioning in DSL or cable modem chipsets requiring fast, low-noise ADC for analog echo cancellation paths. IC Role / Device Role / Timing Role: High-speed data converter handling full-power 2.5 MHz bandwidth signals; leverages 71 dB SNR and –80 dB THD for clean spectral performance. Use Value: 500 ns track-and-hold acquisition time and 1.5 SCLK acquisition cycle ensure minimal aperture jitter (<10 ps RMS) critical for Nyquist-rate sampling of QAM symbols. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 8-channel, serial ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 12-bit, 200 kSPS, 8-channel, SPI-only interface; requires external reference; 2.7 V–5.25 V supply; 16-lead SOIC only. | Lacks autoshutdown mode and on-chip reference - increases external component count and power management complexity. | Choose ADS7822U only if higher throughput (200 kSPS) is mandatory and board space allows SOIC; AD7888BR-REEL offers superior integration and lower quiescent current. |
| MAX11131ETE+ | 12-bit, 500 kSPS, 8-channel, SPI/QSPI compatible; internal 2.048 V reference; 16-lead TQFN (3×3 mm); 2.7 V–3.6 V supply only. | Narrower supply range excludes 5 V systems; smaller package demands tighter layout but lacks TSSOP compatibility. | Select MAX11131ETE+ for space-constrained 3.3 V designs needing >125 kSPS; AD7888BR-REEL remains optimal for dual-voltage (3 V/5 V) industrial and medical platforms. |
Compared with ADS7822U and MAX11131ETE+, the AD7888BR-REEL uniquely combines 125 kSPS throughput, on-chip 2.5 V reference, autoshutdown capability, and 16-lead TSSOP packaging - delivering lowest system-level BOM cost and highest design flexibility for battery- and noise-sensitive applications.
Availability
AD7888BR-REEL is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, and industrial sensor interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AD7888BR-REEL 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 Wilmington, MA, with design centers worldwide.
The AD7888BR-REEL belongs to Analog Devices' precision data acquisition product line, engineered specifically for low-power, multi-channel measurement systems where accuracy, size, and energy efficiency are co-optimized - such as handheld diagnostics and distributed sensing nodes.
FAQ
What is the maximum sampling frequency supported by the AD7888BR-REEL?
The AD7888BR-REEL supports a maximum throughput rate of 125 kSPS, achieved using a 2 MHz SCLK. This corresponds to a total conversion + acquisition time of 16 SCLK cycles (7.25 µs). The device maintains full 12-bit performance up to a full-power input bandwidth of 2.5 MHz, making it suitable for baseband signal digitization in modems and sensor readouts.
Does the AD7888BR-REEL include an internal voltage reference?
Yes, the AD7888BR-REEL integrates a precision 2.5 V bandgap reference with ±50 ppm/°C temperature coefficient, accessible at the REF IN/REF OUT pin. It can be enabled or disabled via the REF bit in the control register. When disabled, the pin accepts external references from 1.2 V to VDD, and input impedance rises to >1 GΩ - minimizing loading on external reference sources.
How does the AD7888BR-REEL manage power in low-duty-cycle applications?
The AD7888BR-REEL provides four programmable power modes via PM1/PM0 bits: normal operation, full shutdown (≤1 µA), autoshutdown (5 µs wake-up), and autostandby. In autoshutdown mode, the device automatically enters full shutdown after each conversion, drawing just 1 µA at 2.7 V - ideal for intermittent sampling in battery-powered data loggers and wearables.
What serial interface protocols is the AD7888BR-REEL compatible with?
The AD7888BR-REEL supports SPI™, QSPI™, MICROWIRE™, and DSP-compatible serial protocols. Its CS/SCLK/DIN/DOUT interface operates with MSB-first 16-bit frames (4 leading zeros + 12-bit result), where DIN loads the 8-bit control register on SCLK rising edges and DOUT outputs conversion data on falling edges - eliminating need for protocol-specific controller hardware.
What is the guaranteed differential nonlinearity (DNL) specification for the AD7888BR-REEL?
The AD7888BR-REEL is the B-grade version, specified with differential nonlinearity of –1/+1.5 LSB maximum across the full temperature range (–40°C to +105°C). This guarantee ensures no missing codes over the entire 12-bit transfer function - a critical requirement for precision measurement systems such as medical instrumentation and calibration equipment.
AD7888BR-REEL 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:
- Obsolete
- 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:
- -
AD7888BR-REEL FAQ
1.How can I place an order for AD7888BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7888BR-REEL 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 AD7888BR-REEL reliable?
The price and inventory of AD7888BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7888BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7888BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7888BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7888BR-REEL?
AD7888BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7888BR-REEL 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 AD7888BR-REEL?
For technical support, including AD7888BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7888BR-REEL requirements.
6.How does Aetrix verify that AD7888BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7888BR-REEL 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 AD7888BR-REEL meets industry standards.
7.What is the process for return or replacement of AD7888BR-REEL?
All AD7888BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7888BR-REEL, 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 AD7888BR-REEL part is unused and in its original packaging.
Return procedure for AD7888BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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