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Analog Devices Inc. AD7868ARZ-REEL
- Part No.:
- AD7868ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7868ARZ-REEL.pdf
- Description:
- IC INTERFACE SPECIALIZED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,730
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Product details
Overview
AD7868ARZ-REEL from Analog Devices is a complete, single-chip 12-bit analog I/O system integrating a successive-approximation ADC with track/hold amplifier and a voltage-output DAC with buffered amplifier. It delivers 83 kHz ADC throughput rate, 72 dB SNR (B version), ±1 LSB INL max, ±3 V analog input/output range, and operates from ±5 V supplies. It serves as a compact data acquisition and waveform generation interface in DSP-based real-time control systems.
For engineers reviewing the AD7868ARZ-REEL datasheet, AD7868ARZ-REEL pinout, AD7868ARZ-REEL application, or AD7868ARZ-REEL equivalent, key selection considerations include bipolar ±3 V signal handling, serial DAC/ADC interface timing compatibility with TMS320-family DSPs, internal 3 V Zener reference stability (±25 ppm/°C typ), and SOIC-28 package thermal and layout constraints for mixed-signal PCB design.
Technical Context
The AD7868ARZ-REEL implements independent serial interfaces for ADC and DAC: ADC uses RFS/RCLK/DR with open-drain outputs requiring 4.7 kΩ (RFS/DR) and 2 kΩ (RCLK) pull-ups; DAC uses TFS/TCLK/DT with data latched on TCLK falling edge and updated to output on LDAC falling edge. The device includes two separate temperature-compensated 3 V buried Zener references - RO ADC and RO DAC - each rated for 500 µA load and ±25 ppm/°C typical drift.
Its ADC employs a track-and-hold amplifier acquiring ±3 V inputs to 12-bit accuracy in ≤2 µs, enabling accurate digitization of up to 41.5 kHz sine waves; the DAC output buffer settles to ±1/2 LSB in ≤3 µs with 0.3 Ω dc impedance and supports ±3 V into 2 kΩ//100 pF loads. Internal clock (2.0 MHz nominal) or external TTL clock options provide flexible timing control, with CONVST and LDAC enabling asynchronous conversion start and DAC update.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit for both ADC and DAC - defines 4096 discrete levels across ±3 V full scale (1.46 mV/LSB). |
| ADC Throughput Rate | 83 kHz - enables real-time sampling of signals up to 41.5 kHz (Nyquist-limited) without aliasing. |
| SNR | 72 dB min at +25°C - ensures ≥11.6 effective bits for high-fidelity signal capture in noise-sensitive applications. |
| DAC Settling Time | 3 µs max to ±1/2 LSB - supports dynamic waveform reconstruction at update rates up to ~333 kHz. |
| Analog Voltage Range | ±3 V for VIN and VOUT - matches standard bipolar signal chains and eliminates need for level-shifting circuitry. |
| Reference Stability | ±25 ppm/°C typ (RO ADC & RO DAC) - maintains <±0.1% full-scale drift over –40°C to +85°C operating range. |
| Power Dissipation | 130 mW typ (±5 V supplies) - enables dense mixed-signal integration without forced air cooling. |
Pinout & Package
AD7868ARZ-REEL is housed in a 28-pin plastic SOIC (Small Outline IC) package with 0.3 inch body width and standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner; pins are numbered counterclockwise starting from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | VDD | Positive supply (+5 V ±5%) - dual pins reduce IR drop and improve PSRR; must be decoupled locally with 10 µF || 0.1 µF. |
| 14, 15 | VSS | Negative supply (–5 V ±5%) - dual pins ensure low-impedance return path for analog and digital sections. |
| 2, 3, 26, 27 | AGND / DGND | Separate analog/digital ground pins - require star grounding at single point to minimize digital noise coupling into ADC. |
| 9 | VIN | ADC analog input - accepts ±3 V differential-to-ground signals; 9 kΩ input impedance and 500 kHz 0.1 dB bandwidth. |
| 10 | VOUT | DAC buffered output - delivers ±3 V into 2 kΩ load; 0.3 Ω output impedance enables fast settling and low distortion. |
| 3, 20 | RO ADC / RO DAC | Internal 3 V reference outputs - each supplies ≤500 µA; capacitive loading >50 pF requires 200 Ω series resistor. |
| 12 | RI DAC | DAC reference input - accepts external 3 V ±5% source or internal RO ADC/RO DAC; internally buffered. |
| 4, 5, 6, 7, 8, 11, 13, 16, 17, 19, 21, 22, 23, 24, 25 | CONVST, LDAC, RFS, RCLK, DR, TFS, TCLK, DT, CLK, CONTROL, AGND, DGND, NC | Dedicated serial control and timing I/O - all logic inputs accept TTL levels; RFS/RCLK/DR are open-drain and require pull-ups. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual-reference architecture | Separate RO ADC and RO DAC outputs enable independent reference sourcing or matched full-scale calibration using one internal reference. |
| Asynchronous conversion & update control | CONVST initiates ADC hold/conversion independently of clock; LDAC updates DAC output asynchronously - critical for deterministic timing in servo loops. |
| Bipolar ±3 V signal interface | No external op-amp level-shifting needed for industrial sensor outputs or actuator drive signals within ±3 V range. |
| Low-glitch DAC output | 10 nV·s typical digital-to-analog glitch impulse minimizes transient injection during code transitions in closed-loop feedback paths. |
| Factory-laser-trimmed internal oscillator | 2.0 MHz nominal clock with 8.5–10 µs conversion time eliminates external crystal/clock source while maintaining timing precision. |
Applications
| DSP-Based Speech Synthesis | Real-Time Spectrum Analyzer Front-End |
|---|---|
|
Use Scenario: Real-time voice synthesis engine using TMS320C54x DSP generates 16-bit audio samples at 8 kHz and acquires microphone feedback for adaptive filtering. IC Role / Device Role / Timing Role: AD7868ARZ-REEL acts as bidirectional analog interface - DAC reconstructs synthesized speech waveforms; ADC digitizes acoustic feedback with 83 kHz sampling headroom for anti-aliasing. Use Value: Integrated 12-bit resolution and 72 dB SNR preserve voice clarity; serial interface minimizes DSP GPIO usage; ±3 V range matches electret mic preamp and speaker driver stages. |
Use Scenario: Portable spectrum analyzer captures RF downconverted IF signals (0–20 kHz) and performs FFT-based frequency-domain analysis in embedded ARM processor. IC Role / Device Role / Timing Role: ADC digitizes conditioned IF output with 2 µs acquisition time and 41.5 kHz usable bandwidth; DAC outputs calibrated sweep voltages to local oscillator tuning port. Use Value: Track/hold enables accurate wideband sampling; internal references eliminate external voltage sources; SOIC-28 footprint supports compact handheld PCB layout. |
| Digital Modem Analog Interface | DSP Servo Motor Controller |
|
Use Scenario: V.34 modem transceiver implements QAM modulation/demodulation using FPGA-based symbol processing and requires precise analog I/O for line driver/receiver interfacing. IC Role / Device Role / Timing Role: DAC generates transmit baseband waveforms; ADC digitizes received signal after analog front-end filtering - both synchronized via shared DSP clock domain. Use Value: 3 µs DAC settling supports 33.6 kbaud symbol rates; 72 dB SNR ensures low BER; serial interface reduces FPGA pin count and simplifies timing closure. |
Use Scenario: Industrial servo controller regulates motor position using PID algorithm running on SHARC DSP, requiring simultaneous analog feedback acquisition and PWM-complementary DAC output for torque command. IC Role / Device Role / Timing Role: ADC reads encoder-conditioned analog tachometer and current sense signals; DAC outputs analog torque reference to power stage - both updated synchronously per control cycle. Use Value: Asynchronous CONVST/LDAC allows deterministic sample-and-hold alignment with control loop period; ±3 V range matches isolation amplifier outputs and gate driver inputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit analog I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865ASZ-1 | 4-channel simultaneous-sampling 12-bit ADC + quad DAC; SPI interface; no internal references; requires external 2.5 V ref. | Higher channel count but no integrated references - suited for multi-axis motion control where external precision ref already exists. | Select AD7865ASZ-1 when simultaneous sampling across ≥2 channels is required and board space permits external reference circuitry. |
| MAX125CEAX+ | 2-channel 14-bit ADC with internal ref; no DAC; parallel interface; 100 kSPS; ±5 V supply. | Higher resolution ADC only - appropriate for measurement-only systems needing >12-bit precision without waveform generation. | Select MAX125CEAX+ when ADC resolution >12 bits is mandatory and DAC functionality is unnecessary or implemented separately. |
Compared with AD7868ARZ-REEL, AD7865ASZ-1 offers greater channel density at the cost of reference dependency and larger package, while MAX125CEAX+ trades DAC integration and serial simplicity for higher ADC resolution and parallel bus speed - neither provides the same monolithic ±3 V bipolar I/O capability in SOIC-28.
Availability
AD7868ARZ-REEL is available at Aetrix Electronics and suitable for digital signal processing, speech synthesis, spectrum analysis, high-speed modem, and DSP servo control applications requiring stable component supply, long-term obsolescence management, and RoHS-compliant packaging.
Supply support for AD7868ARZ-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7868ARZ-REEL belongs to Analog Devices' LC2MOS precision data acquisition product line, engineered for embedded DSP systems requiring tightly integrated, low-power, bipolar analog I/O in minimal footprint.
FAQ
What is the guaranteed operating temperature range for the AD7868ARZ-REEL?
The AD7868ARZ-REEL is rated for operation from –40°C to +85°C (industrial grade). This is confirmed in the Ordering Guide for the "R" package variant (SOIC-28) and applies across all dynamic and dc specifications including SNR, INL, and reference drift. The device uses the B-grade silicon die, ensuring 72 dB minimum SNR across this full range.
Does the AD7868ARZ-REEL require external pull-up resistors on its serial interface pins?
Yes, the AD7868ARZ-REEL requires external pull-up resistors on three open-drain outputs: RFS and DR need 4.7 kΩ to VDD, and RCLK needs 2 kΩ to VDD. These values are specified in the Timing Characteristics table and are essential for meeting setup/hold timing and achieving valid logic levels during serial data transfer.
Can the AD7868ARZ-REEL's internal references be used interchangeably for ADC and DAC?
Yes - the RO ADC and RO DAC pins both provide 3 V ±10 mV references trimmed to ±25 ppm/°C typical drift. For best full-scale matching between ADC and DAC, the datasheet recommends connecting RO ADC to RI DAC (Figure 4), eliminating inter-reference gain mismatch and simplifying system calibration.
What is the maximum capacitive load allowed on the RO ADC or RO DAC pins without external series resistance?
The AD7868ARZ-REEL specifies a maximum capacitive load of 50 pF on either RO ADC or RO DAC for stable operation. Exceeding this value risks reference instability and increased noise; if >50 pF is required (e.g., for filtering), a 200 Ω series resistor must be added per the INTERNAL REFERENCE section (Figure 2).
How does the CONTROL pin affect RCLK behavior in the AD7868ARZ-REEL?
The CONTROL pin configures RCLK output mode: at DGND (0 V), RCLK is noncontinuous and goes high-impedance after serial transmission; at VSS (–5 V), RCLK runs continuously - required for DSPs like TMS32020 that expect uninterrupted clock. Tying CONTROL to VDD places the AD7868ARZ-REEL in factory test mode and must be avoided in normal operation.
AD7868ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Analog I/O
- Interface:
- TTL/CMOS
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- 28-SOIC
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
AD7868ARZ-REEL FAQ
1.How can I place an order for AD7868ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7868ARZ-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 AD7868ARZ-REEL reliable?
The price and inventory of AD7868ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7868ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7868ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7868ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7868ARZ-REEL?
AD7868ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7868ARZ-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 AD7868ARZ-REEL?
For technical support, including AD7868ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7868ARZ-REEL requirements.
6.How does Aetrix verify that AD7868ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7868ARZ-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 AD7868ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7868ARZ-REEL?
All AD7868ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7868ARZ-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 AD7868ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7868ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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