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Analog Devices Inc. AD7888ARU
- Part No.:
- AD7888ARU
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7888ARU.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,002
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Product details
Overview
AD7888ARU 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 71 dB SNR at 10 kHz input and on-chip 2.5 V reference. It features SPI/QSPI/MICROWIRE/DSP-compatible serial interface and eight single-ended analog inputs (AIN1–AIN8), suited for battery-powered medical instruments and portable data acquisition.
For engineers reviewing the AD7888ARU datasheet, AD7888ARU pinout, AD7888ARU application, or AD7888ARU equivalent, key selection considerations include its 16-lead TSSOP package, 1.5-cycle track/hold acquisition time, ±2 LSB integral nonlinearity (A-grade), shutdown current of 1 µA at 2.7–3.6 V, and flexible power management via PM1/PM0 bits in the 8-bit control register.
Technical Context
The AD7888ARU implements a charge redistribution DAC-based SAR architecture with internal track-and-hold, supporting full-power input signals up to 2.5 MHz. Its conversion process requires exactly 16 SCLK cycles (14.5 for conversion + 1.5 for acquisition) at 2 MHz clock, yielding deterministic 125 kSPS throughput.
It integrates an overdrivable 2.5 V reference buffer (REF IN/REF OUT pin), configurable via the REF bit; when disabled, input impedance exceeds 1 GΩ. Power modes-Normal, Full Shutdown, Autoshutdown (5 µs wake-up), and Autostandby-are selected by PM1/PM0 bits and take effect on the 16th SCLK rising edge after CS fall.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes with straight binary coding |
| Throughput Rate | 125 kSPS - fixed rate achievable with 2 MHz SCLK, enabling real-time sampling of signals ≤62.5 kHz Nyquist bandwidth |
| SNR @ 10 kHz | 71 dB typ - supports high-fidelity digitization of audio and sensor signals with low noise floor |
| INL (A Grade) | ±2 LSB max - ensures monotonicity and <0.05% full-scale linearity error across temperature |
| Supply Range | 2.7 V to 5.25 V - compatible with both 3 V and 5 V system rails without level-shifting |
| Shutdown Current | 1 µA max at 2.7–3.6 V - enables multi-day operation in battery-powered sleep modes |
| Reference | Internal 2.5 V ±50 ppm/°C - stable reference source usable as REFOUT or overdriven with 1.2–VDD external voltage |
Pinout & Package
AD7888ARU is housed in a 16-lead thin shrink small outline package (TSSOP), 5.0 mm × 4.4 mm × 1.2 mm body size, with 0.65 mm lead pitch and exposed pad not electrically connected. Pin 1 is marked with a dot; pins are numbered counterclockwise from top-left corner in top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low frame signal initiating conversion and serial data transfer; must be held low for full 16-SCLK cycle |
| 2 (REF IN/REF OUT) | Reference I/O | Provides access to internal 2.5 V reference or accepts external 1.2–VDD reference; impedance = 5 kΩ (ref enabled) or >1 GΩ (ref disabled) |
| 3 (VDD) | Power Supply | Single 2.7–5.25 V rail powering all analog and digital circuitry; decoupling capacitor required |
| 4, 13 (AGND) | Analog Ground | Dual ground pins for low-noise return path; both must connect to system AGND plane |
| 5–12 (AIN1–AIN8) | Analog Inputs | Eight single-ended channels, each 0–VREF range; unselected inputs must tie to AGND to prevent crosstalk |
| 14 (DIN) | Data Input | Serial control word input (MSB first) loaded on SCLK rising edge; used to set ADD2:0, REF, PM1:0 bits |
| 15 (DOUT) | Data Output | 16-bit serial stream: four leading zeros + 12-bit conversion result (MSB first), clocked on SCLK falling edge |
| 16 (SCLK) | Serial Clock | Master clock for both control register loading and SAR conversion timing; 2 MHz max frequency |
Key Features
| Feature | Design Value |
|---|---|
| Flexible Power Management | Four selectable modes (Normal, Full Shutdown, Autoshutdown, Autostandby) controlled by PM1/PM0 bits reduce average current from 700 µA to 1 µA |
| On-Chip Reference Buffer | 2.5 V ±50 ppm/°C reference with user-accessible REF IN/REF OUT pin; disableable to support precision external references |
| High Channel Isolation | –80 dB typ at 25 kHz - minimizes crosstalk between multiplexed inputs in multi-sensor systems |
| Low Acquisition Time | 1.5 SCLK cycles (750 ns @ 2 MHz) - enables accurate sampling of fast-rising transients without external buffering |
| SPI-Compatible Interface | Supports standard SPI, QSPI, MICROWIRE, and DSP serial protocols - simplifies integration with common microcontrollers |
Applications
| Portable Medical Monitoring | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous acquisition of ECG, temperature, and SpO₂ signals in handheld patient monitors. IC Role / Device Role / Timing Role: 12-bit ADC digitizing eight analog sensor outputs sequentially with 125 kSPS aggregate rate and 71 dB SNR. Use Value: Micropower shutdown mode (<1 µA) extends battery life to >1 week on coin cell; on-chip reference eliminates need for external precision reference IC. | Use Scenario: Environmental sensing node logging temperature, humidity, and pressure over weeks on AA batteries. IC Role / Device Role / Timing Role: Low-voltage ADC interfacing with multiple passive sensors, powered from 3 V supply with autoshutdown between samples. Use Value: 2.7 V minimum supply and 1 µA shutdown current enable direct connection to battery without regulator; TSSOP footprint saves PCB area vs. SOIC alternatives. |
| Industrial Sensor Hub | Wireless Modem Front-End |
Use Scenario: Signal conditioning module aggregating vibration, current, and voltage measurements in factory automation PLCs. IC Role / Device Role / Timing Role: 8-channel SAR ADC with channel-to-channel isolation >80 dB acquiring synchronized multi-parameter data. Use Value: Single-supply operation (2.7–5.25 V) and robust ESD protection (1 kV HBM) ensure reliability in noisy industrial environments. | Use Scenario: Analog front-end in 3G/4G modem capturing IF signals for digital demodulation. IC Role / Device Role / Timing Role: High-speed ADC converting baseband analog signals at 125 kSPS with 2.5 MHz full-power bandwidth. Use Value: 71 dB SNR and –80 dB THD support clean digitization of modulated carriers; SPI interface allows direct connection to modem's DSP core. |
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, 8-channel, but uses pseudo-differential input topology and lacks internal reference | Requires external reference and differential driver circuitry; better suited for ratiometric measurements with bridge sensors | Select ADS7822U only if pseudo-differential input and higher speed outweigh need for internal reference and single-ended simplicity |
| MAX11131ETE+ | 12-bit, 500 kSPS, 2.7–3.6 V, 8-channel, integrated reference (4.096 V), but narrower supply range and no 5 V compatibility | Optimized for 3 V systems only; higher throughput suits burst-mode acquisition but limits flexibility in mixed-voltage designs | Choose MAX11131ETE+ when 500 kSPS and 4.096 V reference are mandatory, and 5 V operation is unnecessary |
Compared with ADS7822U and MAX11131ETE+, the AD7888ARU uniquely balances 5 V compatibility, integrated 2.5 V reference, ultra-low shutdown current (1 µA), and proven 125 kSPS performance in battery-constrained portable instrumentation.
Availability
AD7888ARU is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, and industrial sensor hubs requiring stable component supply and long-term lifecycle assurance.
Supply support for AD7888ARU 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 AD7888ARU belongs to Analog Devices' precision data acquisition product line, designed specifically for low-power, multi-channel measurement applications in portable and embedded systems where size, power, and accuracy are critical.
FAQ
What is the maximum sample rate supported by the AD7888ARU?
The AD7888ARU supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK. This rate is fixed and determined by its 16-cycle conversion sequence (14.5 cycles for conversion + 1.5 for acquisition). At lower SCLK frequencies, the throughput scales linearly; for example, at 1 MHz SCLK, the rate drops to 62.5 kSPS. The AD7888ARU does not support variable-rate sampling independent of clock frequency.
Does the AD7888ARU require an external reference voltage?
No, the AD7888ARU does not require an external reference voltage because it integrates a 2.5 V ±50 ppm/°C reference accessible via the REF IN/REF OUT pin. However, this internal reference can be disabled using the REF bit in the control register, allowing an external reference (1.2 V to VDD) to be applied to the same pin. When the internal reference is active, its output impedance is ~5 kΩ; when disabled, input impedance exceeds 1 GΩ.
How many analog input channels does the AD7888ARU have, and what type are they?
The AD7888ARU has eight single-ended analog input channels labeled AIN1 through AIN8. Each channel accepts signals from 0 V to VREF (where VREF is either the internal 2.5 V reference or an externally applied voltage). The 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 coupling and maintain channel-to-channel isolation of –80 dB.
What power management modes are available on the AD7888ARU?
The AD7888ARU offers four power management modes selected via PM1/PM0 bits: Normal Operation (700 µA typical), Full Shutdown (1 µA max at 2.7–3.6 V), Autoshutdown (5 µs wake-up time), and Autostandby (faster wake-up than Autoshutdown with reference kept active). All modes retain control register contents during shutdown. Wake-up from Full Shutdown requires reprogramming PM1/PM0 to "00"; Autoshutdown and Autostandby resume automatically on next CS assertion.
Is the AD7888ARU pin-compatible with other Analog Devices 8-channel ADCs?
No, the AD7888ARU is not pin-compatible with other Analog Devices 8-channel ADCs such as the AD7923 or AD7266. Its 16-lead TSSOP pinout-featuring dual AGND pins (4 and 13), dedicated REF IN/REF OUT (pin 2), and specific DIN/DOUT/SCLK placement-is unique to the AD7888 family. Substituting with another part requires PCB layout revision and firmware adaptation due to differences in control register structure, timing, and reference handling.
AD7888ARU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7888ARU FAQ
1.How can I place an order for AD7888ARU through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7888ARU 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 AD7888ARU reliable?
The price and inventory of AD7888ARU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7888ARU is usually 5 days.
3.What payment methods are accepted for AD7888ARU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7888ARU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7888ARU?
AD7888ARU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7888ARU 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 AD7888ARU?
For technical support, including AD7888ARU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7888ARU requirements.
6.How does Aetrix verify that AD7888ARU is sourced from the original manufacturer or authorized distributors?
All AD7888ARU 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 AD7888ARU meets industry standards.
7.What is the process for return or replacement of AD7888ARU?
All AD7888ARU units undergo pre-shipment inspection (PSI). If there is an issue with AD7888ARU, 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 AD7888ARU part is unused and in its original packaging.
Return procedure for AD7888ARU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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