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Analog Devices Inc. AD7888ARUZ
- Part No.:
- AD7888ARUZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
AD7888ARUZ.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,325
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Product details
Overview
AD7888ARUZ 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 and on-chip 2.5 V reference. It features eight single-ended analog inputs (AIN1–AIN8), SPI/QSPI/MICROWIRE/DSP-compatible serial interface, and 16-lead TSSOP package - used in battery-powered medical instruments and portable instrumentation.
For engineers reviewing the AD7888ARUZ datasheet, AD7888ARUZ pinout, AD7888ARUZ application, or AD7888ARUZ equivalent, key selection considerations include its 125 kSPS conversion rate with 2.5 MHz full-power bandwidth, flexible power management (shutdown current ≤1 µA at 2.7 V), channel-to-channel isolation of –80 dB, and support for internal/external reference (1.2 V to VDD).
Technical Context
The AD7888ARUZ implements a charge redistribution SAR architecture with integrated track-and-hold, enabling 500 ns acquisition time and 7.25 µs conversion time at 2 MHz SCLK. Its 8:1 analog multiplexer is controlled via an 8-bit write-only control register with ADD0–ADD2 addressing and REF/PM bits for reference enable/disable and power mode selection (Normal, Full Shutdown, Autoshutdown, Autostandby).
It supports straight binary output coding (12-bit + 4 leading zeros), operates with ±1 µA input leakage and 38 pF analog input capacitance in track mode, and achieves guaranteed no-missed-codes performance across its B-grade specification (12-bit monotonicity). The on-chip 2.5 V reference exhibits ±50 ppm/°C tempco and can be overdriven by external sources from 1.2 V to VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes with LSB = VREF/4096 |
| Throughput Rate | 125 kSPS - enables real-time sampling of signals up to 2.5 MHz (–3 dB full-power bandwidth) |
| SNR | 71 dB typ at 10 kHz - ensures high-fidelity digitization for precision sensor and audio front-end applications |
| Channel Count | 8 single-ended inputs (AIN1–AIN8) - reduces board space vs. multiple single-channel ADCs |
| Supply Range | 2.7 V to 5.25 V - supports direct integration into 3 V and 5 V systems without level-shifting |
| Shutdown Current | 1 µA max at 2.7 V - extends battery life in sleep-mode intervals for portable devices |
| Reference | Internal 2.5 V ±50 ppm/°C or external 1.2 V to VDD - allows system-level reference sharing or enhanced accuracy |
Pinout & Package
AD7888ARUZ 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 connected internally. Pin 1 is marked with a dot; pin numbering follows standard TSSOP top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low input initiating conversion and framing serial data transfer; must remain 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; input impedance ~5 kΩ when enabled, >1 GΩ when disabled |
| VDD | Power Supply | Single 2.7 V–5.25 V supply powering all analog and digital circuitry; decoupling required per typical connection diagram |
| AGND (Pins 4, 13) | Analog Ground | Common reference for analog inputs, reference, and internal circuitry; both pins must connect to clean analog ground plane |
| AIN1–AIN8 (Pins 5–12) | Analog Inputs | Eight single-ended channels, each accepting 0 V to VREF; unselected channels must tie to AGND to prevent noise coupling |
| DIN | Data Input | Serial control register load path; 8-bit command (MSB first) clocked on rising SCLK edge during CS low |
| DOUT | Data Output | 16-bit serial stream (4 leading zeros + 12-bit result, MSB first) clocked on falling SCLK edge |
| SCLK | Serial Clock | Master clock for data transfer and internal conversion timing; supports up to 2 MHz operation |
Key Features
| Feature | Design Value |
|---|---|
| Smallest 12-bit 8-channel ADC footprint | 16-lead TSSOP occupies same PCB area as 8-lead SOIC and less than half the height - saves space in compact PDA and wearable designs |
| Lowest power consumption in class | 3 µW shutdown power dissipation at 3 V - enables multi-year battery life in intermittent-sampling applications |
| Flexible power management | Four selectable modes (Normal, Full Shutdown, Autoshutdown, Autostandby) programmable via PM1/PM0 bits - matches power use to exact throughput demand |
| Versatile serial interface | Hardware-compatible with SPI, QSPI, MICROWIRE, and DSP protocols - simplifies firmware reuse across microcontroller platforms |
| Guaranteed no-missed-codes | B-grade version ensures monotonic 12-bit transfer function - critical for closed-loop control and position-sensing applications |
Applications
| Portable Medical Instrumentation | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous monitoring of ECG, temperature, and blood oxygen saturation in handheld patient monitors. IC Role / Device Role / Timing Role: 12-bit analog front-end digitizing multiple biopotential and environmental sensors with synchronized sampling. Use Value: 125 kSPS throughput captures transient cardiac events; 71 dB SNR preserves diagnostic signal fidelity; 1 µA shutdown current extends AA battery life beyond 12 months. |
Use Scenario: Long-term environmental sensing (temperature, humidity, pressure) in remote field deployments powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC acquiring sensor data every 10 seconds, then entering autoshutdown mode. Use Value: Sub-µA quiescent current minimizes standby drain; 8-channel integration eliminates external MUX; TSSOP package enables compact PCB layout. |
| Industrial Sensor Signal Conditioning | High-Speed Modem Analog Front-End |
|
Use Scenario: Digitizing outputs from strain gauges, RTDs, and thermocouples in PLC I/O modules with isolated analog inputs. IC Role / Device Role / Timing Role: Precision 12-bit converter interfacing with op-amp signal conditioning stages and isolated SPI bus. Use Value: Channel-to-channel isolation of –80 dB prevents crosstalk between sensor channels; ±1 LSB DNL ensures linearity for calibration-critical measurements. |
Use Scenario: Real-time sampling of baseband analog signals in DSL or cable modem receiver paths requiring >100 kSPS rates. IC Role / Device Role / Timing Role: High-speed ADC capturing modulated analog waveforms prior to digital demodulation and FEC decoding. Use Value: 2.5 MHz full-power bandwidth supports Nyquist sampling of broadband signals; 71 dB SNR maintains EVM performance in QAM-64 systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, 8-channel, serial-interface ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7923BRUZ | Successor part with 1 MSPS throughput, 73 dB SNR, and improved THD (–90 dB); requires 3.3 V or 5 V supply only (no 2.7 V support) | Better suited for higher-bandwidth industrial control loops where >125 kSPS is needed | Select AD7923BRUZ when upgrading for speed and SNR; verify compatibility with existing 2.7 V systems before migration |
| MAX11131ETE+ | 12-bit, 8-channel, 250 kSPS SAR ADC with internal reference and SPI interface; 1.8 V–3.6 V supply range only; no 5 V operation | Ideal for ultra-low-voltage battery systems (e.g., Li-ion or coin cell) where 5 V rail is unavailable | Choose MAX11131ETE+ for sub-3.6 V designs prioritizing minimal supply count; confirm reference stability requirements match internal 2.048 V ref |
Compared with AD7888ARUZ, AD7923BRUZ offers higher speed and SNR but sacrifices 2.7 V operation, while MAX11131ETE+ enables lower-voltage systems but lacks 5 V compatibility and has reduced full-power bandwidth (1.5 MHz).
Availability
AD7888ARUZ is available at Aetrix Electronics and suitable for battery-powered medical instruments, portable data loggers, and industrial sensor signal conditioning requiring stable component supply across extended product lifecycles.
Supply support for AD7888ARUZ 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 industrial, automotive, communications, and healthcare markets since 1965.
The AD7888ARUZ belongs to Analog Devices' precision data acquisition IC family, designed specifically for low-power, multi-channel, high-resolution sampling in space- and energy-constrained embedded systems.
FAQ
What is the maximum sample rate supported by the AD7888ARUZ?
The AD7888ARUZ supports a maximum throughput rate of 125 kSPS when operated with a 2 MHz SCLK and VDD between 2.7 V and 5.25 V. This corresponds to a total conversion + acquisition time of 16 SCLK cycles (7.25 µs conversion + 1.5 SCLK acquisition). The device maintains this rate across its full operating temperature range (–40°C to +105°C) and supply range.
Does the AD7888ARUZ require an external reference, or does it have an internal one?
The AD7888ARUZ includes an internal 2.5 V reference with ±50 ppm/°C tempco, accessible via the REF IN/REF OUT pin. It can be used directly or overdriven by an external reference from 1.2 V to VDD. When using an external reference, the internal reference must be disabled via the REF bit in the control register to ensure optimal performance and avoid loading effects.
How many analog input channels does the AD7888ARUZ support, and what type are they?
The AD7888ARUZ supports eight single-ended analog input channels labeled AIN1 through AIN8. Each channel accepts a voltage from 0 V to VREF (where VREF is either the internal 2.5 V reference or an externally applied value). The input multiplexer is controlled by ADD0–ADD2 bits in the 8-bit control register, and unused channels must be tied to AGND to prevent noise coupling.
What power management modes are available on the AD7888ARUZ, and how are they selected?
The AD7888ARUZ offers four power management modes: Normal Operation, Full Shutdown, Autoshutdown, and Autostandby - selected by programming the PM1 and PM0 bits in the control register. Autoshutdown reduces current to ≤1 µA after each conversion with 5 µs wake-up time; Autostandby retains the internal reference active for faster restart. All modes are software-configurable without hardware changes.
Is the AD7888ARUZ pin-compatible with other members of the AD78xx family?
No, the AD7888ARUZ is not pin-compatible with other AD78xx-series ADCs such as the AD7887 or AD7889. Its 16-lead TSSOP pinout is unique to the AD7888 family, with dedicated dual AGND pins (4 and 13), shared REF IN/REF OUT (Pin 2), and specific DIN/DOUT/SCLK placement. Board layout must be designed specifically for AD7888ARUZ.
AD7888ARUZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm 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-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7888ARUZ FAQ
1.How can I place an order for AD7888ARUZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7888ARUZ 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 AD7888ARUZ reliable?
The price and inventory of AD7888ARUZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7888ARUZ is usually 5 days.
3.What payment methods are accepted for AD7888ARUZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7888ARUZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7888ARUZ?
AD7888ARUZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7888ARUZ 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 AD7888ARUZ?
For technical support, including AD7888ARUZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7888ARUZ requirements.
6.How does Aetrix verify that AD7888ARUZ is sourced from the original manufacturer or authorized distributors?
All AD7888ARUZ 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 AD7888ARUZ meets industry standards.
7.What is the process for return or replacement of AD7888ARUZ?
All AD7888ARUZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7888ARUZ, 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 AD7888ARUZ part is unused and in its original packaging.
Return procedure for AD7888ARUZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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