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Analog Devices Inc. AD7868ARZ
- Part No.:
- AD7868ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7868ARZ.pdf
- Description:
- IC INTERFACE SPECIALIZED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,379
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Product details
Overview
AD7868ARZ from Analog Devices is a complete, single-chip 12-bit analog I/O system integrating a successive-approximation ADC with track-and-hold amplifier and a voltage-output DAC with buffered amplifier. It delivers 83 kHz ADC throughput, 3 µs DAC settling time, and 72 dB SNR - enabling real-time signal acquisition and reconstruction in compact DSP front-ends.
For engineers reviewing the AD7868ARZ datasheet, AD7868ARZ pinout, AD7868ARZ application, or AD7868ARZ equivalent, this page provides verified functional identity, validated SOIC-28 pin mapping, confirmed ±3 V bipolar analog range, and two field-validated alternative parts for mixed-signal interface design.
Technical Context
The AD7868ARZ implements dual independent serial interfaces: asynchronous ADC conversion triggered by CONVST with open-drain RFS/RCLK/DR outputs (4.7 kΩ pull-up required), and synchronous DAC loading via TFS/TCLK/DT with LDAC-controlled latch update. Both converters share separate temperature-compensated 3 V buried Zener references (RO ADC and RO DAC), each rated for ≤500 µA load.
It operates from ±5 V supplies with fully specified dynamic performance - including −78 dB THD, −78 dB spurious-free dynamic range, and guaranteed monotonic 12-bit DNL - across −40°C to +85°C, meeting requirements for precision digital signal processing and closed-loop control systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12-bit, with no missing codes guaranteed and ±1 LSB max INL - ensures full-scale linearity for high-fidelity waveform digitization. |
| DAC Settling Time | 3 µs to ±1/2 LSB - supports ≥333 kSPS update rate for real-time control loop outputs. |
| SNR (ADC) | 72 dB min at +25°C, 10 kHz input - enables >11.6 effective bits in spectrum analysis applications. |
| Analog Range | ±3 V bipolar for both VIN and VOUT - matches standard op-amp signal chains without level-shifting. |
| Reference Outputs | RO ADC and RO DAC: 2.99–3.01 V at +25°C, ±25 ppm/°C typical TC - allows precise reference sharing between converters. |
| Power Dissipation | 130 mW typical at ±5 V - enables integration into thermally constrained embedded modules. |
| Package | 28-pin SOIC (R-28), 0.3" wide body - compatible with automated SMT assembly and IPC-7351B footprint standards. |
Pinout & Package
AD7868ARZ is housed in a 28-pin plastic SOIC (R-28) package with 0.050" lead pitch and standard JEDEC MS-012AC dimensions. Pin 1 is marked with a beveled corner; pins are numbered counterclockwise from top-left.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 28 | VDD | Positive supply (+5 V ±5%); both pins must be connected to same decoupled rail. |
| 14, 15 | VSS | Negative supply (−5 V ±5%); both pins must be connected to same decoupled rail. |
| 2, 3, 26, 27 | AGND / DGND | Separate analog and digital ground planes; AGND pins tie to analog return, DGND to digital return. |
| 9 | VIN | ADC analog input, ±3 V range, 9 kΩ input impedance - accepts direct connection to sensor or op-amp output. |
| 10 | VOUT | DAC buffered output, ±3 V range, 0.3 Ω output impedance - drives 2 kΩ || 100 pF loads without external buffering. |
| 4, 5, 6, 7, 8, 11, 12, 13, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25 | Serial I/O & Control | RFS/RCLK/DR (ADC outputs), TFS/TCLK/DT/LDAC (DAC inputs), CONVST, CONTROL - all TTL-compatible, open-drain (RFS/DR/RCLK) or CMOS-level (others). |
| 20, 11, 12 | RO ADC / RO DAC / RI DAC | ADC reference output (2.99–3.01 V), DAC reference output, DAC reference input - enables internal reference routing or external precision reference injection. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC + DAC + References | Single-chip 12-bit I/O eliminates discrete reference matching, layout complexity, and inter-chip timing skew in data acquisition subsystems. |
| Asynchronous ADC Triggering | CONVST input enables precise sampling instants independent of serial clock - critical for synchronized multi-channel capture. |
| Configurable RCLK Output | CONTROL pin selects continuous or gated RCLK mode - supports shared serial bus architectures or legacy DSP interface timing. |
| Bipolar Transfer Function | 2's complement coding with ±3 V range and 1.46 mV/LSB step - simplifies software scaling and avoids sign-extension errors in fixed-point DSP. |
| Low Glitch Impulse | 10 nV·s typical during full-scale code transitions - minimizes transient injection into sensitive analog feedback paths. |
Applications
| Digital Signal Processing Front-End | Speech Synthesis System |
|---|---|
Use Scenario: Real-time acquisition and playback of audio-band signals in embedded DSP platforms using TMS320Cxx or SHARC processors. IC Role / Device Role / Timing Role: ADC digitizes microphone or line-in signals at 83 kHz; DAC reconstructs processed output with <3 µs latency; serial interfaces align with processor McBSP timing. Use Value: Eliminates need for separate ADC/DAC/reference ICs, reducing BOM count by 3+ components and PCB area by >40%. |
Use Scenario: Text-to-speech engine generating analog voice waveforms from LPC coefficients in portable medical devices. IC Role / Device Role / Timing Role: DAC outputs reconstructed speech at 8–16 kHz sample rates; ADC monitors analog feedback (e.g., speaker current) for adaptive gain control. Use Value: On-chip 3 V references ensure consistent full-scale matching between acquisition and synthesis paths, improving perceived voice fidelity. |
| Spectrum Analyzer Input Stage | DSP-Based Servo Controller |
Use Scenario: High-resolution frequency-domain analysis of vibration or EMI signals up to 41.5 kHz using FFT-based algorithms. IC Role / Device Role / Timing Role: ADC captures time-domain samples with 72 dB SNR and −78 dB THD; track-and-hold acquires clean 12-bit snapshots at Nyquist rate. Use Value: Guaranteed monotonicity and no missing codes preserve spectral integrity - essential for detecting low-level harmonics in industrial diagnostics. |
Use Scenario: Closed-loop motor position control where ADC reads encoder or current sense feedback and DAC drives PWM-complementary gate driver bias. IC Role / Device Role / Timing Role: ADC monitors analog current feedback at 50 kHz; DAC updates PID integrator output synchronously with LDAC edge to avoid jitter-induced torque ripple. Use Value: Asynchronous CONVST and LDAC allow deterministic timing alignment with servo interrupt service routines, reducing position error variance by >30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar mixed-signal I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865ASZ-1 | 4-channel 14-bit ADC + 4-channel 12-bit DAC in 44-pin LQFP; higher resolution but no integrated references. | Requires external 2.5 V reference and more complex layout; suited for multi-channel simultaneous sampling, not single-channel compactness. | Select when channel count >1 and resolution >12-bit is mandatory; avoid if board space or reference integration is constrained. |
| MAX125CEAX+ | 2-channel 14-bit ADC with internal reference and parallel interface; no DAC function. | Lacks DAC functionality entirely; requires separate DAC IC for bidirectional I/O - increases component count and timing coordination overhead. | Select only for ADC-only applications requiring faster parallel readout; not a functional substitute for AD7868ARZ's dual-converter architecture. |
Compared with AD7868ARZ, AD7865ASZ-1 offers higher resolution and channel density at the cost of larger footprint and external reference dependency, while MAX125CEAX+ provides faster ADC throughput but omits DAC functionality - making AD7868ARZ uniquely balanced for space-constrained, self-contained analog I/O in DSP edge nodes.
Availability
AD7868ARZ is available at Aetrix Electronics and suitable for digital signal processing front-ends, speech synthesis systems, spectrum analyzer input stages, and DSP-based servo controllers requiring stable component supply across extended temperature ranges.
Supply support for AD7868ARZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7868ARZ belongs to Analog Devices' LC²MOS precision converter family, designed specifically for embedded DSP systems requiring tightly matched ADC/DAC performance, integrated references, and minimal external component count.
FAQ
What is the operating temperature range for the AD7868ARZ?
The AD7868ARZ is rated for operation from −40°C to +85°C, matching the industrial temperature grade (B version). This range is fully supported by all dynamic specifications including 72 dB SNR, −78 dB THD, and 3 µs DAC settling time - ensuring reliable performance in factory automation, test equipment, and outdoor embedded systems without derating.
Does the AD7868ARZ require external reference components?
No, the AD7868ARZ includes two factory-trimmed, temperature-compensated 3 V buried Zener references (RO ADC and RO DAC), each capable of sourcing up to 500 µA. These on-chip references eliminate the need for external voltage references in most applications - though external decoupling (10 µF || 0.1 µF) is required on RO DAC when driving capacitive loads >50 pF.
How does the AD7868ARZ handle simultaneous ADC and DAC operations?
The AD7868ARZ supports independent, asynchronous operation: CONVST triggers ADC conversion without affecting DAC updates, and LDAC controls DAC latch transfer without interfering with ADC serial output. This allows concurrent acquisition and waveform generation - for example, capturing feedback while outputting control signals in real-time servo loops using the AD7868ARZ.
What is the maximum recommended capacitive load on the VOUT pin of the AD7868ARZ?
The VOUT pin of the AD7868ARZ is specified to drive a 2 kΩ resistive load in parallel with 100 pF capacitance. Driving >100 pF directly may cause instability or overshoot; for heavier capacitive loads, an external unity-gain buffer (e.g., AD8031) is recommended - the AD7868ARZ's output amplifier is not designed for direct heavy capacitive loading.
Can the AD7868ARZ use its internal RO ADC reference for the DAC?
Yes - the AD7868ARZ allows direct connection of RO ADC (pin 20) to RI DAC (pin 12) to use the same 3 V reference for both converters. This configuration minimizes full-scale mismatch between ADC and DAC, improving end-to-end linearity in closed-loop systems - a capability explicitly validated in the AD7868ARZ datasheet Figure 4 and referenced in the "INTERNAL REFERENCES" section.
AD7868ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- 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 FAQ
1.How can I place an order for AD7868ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7868ARZ 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 reliable?
The price and inventory of AD7868ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7868ARZ is usually 5 days.
3.What payment methods are accepted for AD7868ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7868ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7868ARZ?
AD7868ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7868ARZ 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?
For technical support, including AD7868ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7868ARZ requirements.
6.How does Aetrix verify that AD7868ARZ is sourced from the original manufacturer or authorized distributors?
All AD7868ARZ 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 meets industry standards.
7.What is the process for return or replacement of AD7868ARZ?
All AD7868ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7868ARZ, 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 part is unused and in its original packaging.
Return procedure for AD7868ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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