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Analog Devices Inc. AD7868BRZ-REEL
- Part No.:
- AD7868BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7868BRZ-REEL.pdf
- Description:
- IC INTERFACE SPECIALIZED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,539
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Product details
Overview
AD7868BRZ-REEL from Analog Devices is a complete, single-chip 12-bit analog I/O system integrating a successive-approximation ADC with track-and-hold (83 kHz throughput, ±3 V input range, 72 dB SNR) and a buffered voltage-output DAC (±3 V output, 3 µs settling time, 72 dB SNR), all operating from ±5 V supplies with on-chip 3 V buried Zener references. It serves as a compact, synchronized data acquisition and waveform generation interface in DSP-based real-time control loops.
For engineers reviewing the AD7868BRZ-REEL datasheet, AD7868BRZ-REEL pinout, AD7868BRZ-REEL application, or AD7868BRZ-REEL equivalent, key selection considerations include its dual serial interfaces (separate ADC/DAC clocks and frame sync), asynchronous CONVST/LDAC control, guaranteed monotonic 12-bit performance, and SOIC-28 package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The AD7868BRZ-REEL implements two independent serial interfaces: ADC side uses RFS (active-low frame sync), RCLK (gated open-drain clock), and DR (open-drain data), while DAC side uses TFS (frame sync), TCLK (data latch clock), DT (serial data input), and LDAC (latch update trigger). Both interfaces transfer 16-bit words containing 12 valid data bits plus 4 leading don't-care bits.
Its internal architecture includes two factory-trimmed 3 V buried Zener references (RO ADC and RO DAC, each rated for ≤500 µA load), a track-and-hold amplifier with <2 µs acquisition time, and a noninverting output buffer capable of driving ±3 V into 2 kΩ || 100 pF. Conversion timing is configurable via internal 2.0 MHz oscillator (CLK tied to VSS) or external TTL clock.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12 bits with guaranteed no missing codes and ±1 LSB max integral nonlinearity |
| DAC Settling Time | 3 µs to ±1/2 LSB - enables accurate waveform reconstruction at >100 kHz update rates |
| Throughput Rate | 83 kHz - supports real-time sampling of signals up to ~41.5 kHz (Nyquist-limited) |
| Signal-to-Noise Ratio | 72 dB min (ADC & DAC) - ensures ≥11.6 effective bits for high-fidelity signal processing |
| Reference Accuracy | 3.00 V ±10 mV with ±25 ppm/°C typical drift - provides stable full-scale calibration across temperature |
| Power Dissipation | 130 mW typical at ±5 V - suitable for thermally constrained embedded systems |
| Analog Voltage Range | ±3 V for both VIN and VOUT - simplifies bipolar signal interfacing without level-shifting circuitry |
Pinout & Package
AD7868BRZ-REEL is housed in a 28-pin plastic SOIC (Small Outline IC) package, 0.300" body width, RoHS-compliant, tape-and-reel format (REEL suffix). Pin 1 is marked by a beveled corner; pins are numbered counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pins 1, 28) | Positive Power Supply | +5 V ±5% supply for analog and digital sections; both pins must be connected and decoupled |
| VSS (Pins 14, 15) | Negative Power Supply | –5 V ±5% supply; enables true bipolar operation and reference biasing |
| AGND (Pins 2, 27) | Analog Ground | Low-noise return path for ADC/DAC analog circuitry; separate from DGND |
| DGND (Pins 3, 26) | Digital Ground | Return for logic inputs/outputs; must be connected to AGND at single point |
| VIN (Pin 4) | ADC Analog Input | ±3 V differential input range with 9 kΩ typical impedance; accepts signals up to 500 kHz bandwidth |
| VOUT (Pin 5) | DAC Analog Output | Buffered voltage output, ±3 V swing into 2 kΩ || 100 pF; settles in ≤3 µs |
| RO ADC (Pin 6) | ADC Reference Output | 3.00 V ±10 mV precision reference; usable as DAC reference when connected to RI DAC |
| RI DAC (Pin 7) | DAC Reference Input | Accepts internal RO ADC or RO DAC (3 V ±5%) or external 3 V source; buffered internally |
| RO DAC (Pin 8) | DAC Reference Output | Dedicated 3 V reference for DAC section; isolated from RO ADC for independent scaling |
| CONVST (Pin 9) | ADC Convert Start | Asynchronous edge-triggered input; rising edge initiates conversion and holds VIN sample |
| RFS (Pin 10) | ADC Frame Sync | Active-low open-drain output; frames 16-bit serial ADC data stream; requires 4.7 kΩ pull-up |
| RCLK (Pin 11) | ADC Serial Clock | Gated open-drain clock output derived from ADC master clock; requires 2 kΩ pull-up |
| DR (Pin 12) | ADC Data Out | Open-drain serial data output; 16-bit word (4 zeros + 12-bit result); valid on RCLK falling edge |
| TFS (Pin 16) | DAC Frame Sync | Active-low input signaling start of 16-bit DAC serial data transfer |
| DT (Pin 17) | DAC Data In | Serial data input latched on TCLK falling edge; MSB-first, 4 don't-care bits + 12 data bits |
| TCLK (Pin 18) | DAC Serial Clock | Input clock for DAC serial data loading; falling-edge triggered; 40/60–60/40 mark/space ratio |
| LDAC (Pin 19) | DAC Load Control | Falling-edge triggered latch enable; transfers data from input latch to DAC register |
| CONTROL (Pin 20) | RCLK Gating Control | Logic input controlling RCLK continuity: 0 V = gated off after transmission; –5 V = continuous |
| CLK (Pin 21) | ADC Clock Select | Tie to VSS to enable internal 2.0 MHz oscillator; apply external TTL clock otherwise |
| NC (Pins 13, 22–25) | No Connect | Not bonded; must remain unconnected per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC + DAC + References | Single SOIC-28 chip replaces discrete signal chain components, reducing BOM count and layout area |
| Independent Serial Interfaces | Separate ADC receive (RFS/RCLK/DR) and DAC transmit (TFS/TCLK/DT) paths prevent bus contention |
| Asynchronous Control Logic | CONVST and LDAC operate independently of serial clocks, enabling precise timing in deterministic systems |
| Bipolar ±3 V Operation | Native support for symmetric analog signals eliminates need for external level-shifting or biasing networks |
| Factory-Trimmed References | Two 3 V buried Zener references (RO ADC, RO DAC) with ±25 ppm/°C drift ensure matched scaling accuracy |
| Industrial Temperature Range | Specified from –40°C to +85°C (B-grade), supporting deployment in harsh environments without derating |
Applications
| Digital Signal Processing (DSP) Systems | Speech Recognition Front-End |
|---|---|
Use Scenario: Real-time audio capture and synthesis in embedded DSP platforms using TI TMS320 series processors. IC Role / Device Role / Timing Role: Serves as the primary analog interface, synchronizing ADC sampling and DAC playback via dedicated serial buses and CONVST/LDAC triggers. Use Value: 83 kHz throughput and 72 dB SNR enable clean 16-bit audio digitization up to 41.5 kHz, meeting ITU-T G.711 requirements without oversampling. |
Use Scenario: Voice command acquisition in automotive infotainment or smart home hubs with low-latency response. IC Role / Device Role / Timing Role: Provides simultaneous analog input (microphone preamp output) and output (speaker driver) with matched reference scaling. Use Value: Dual on-chip 3 V references ensure identical full-scale definitions for ADC and DAC, minimizing gain mismatch in closed-loop voice feedback paths. |
| Spectrum Analysis Instruments | DSP-Based Servo Control |
Use Scenario: Portable FFT analyzers requiring high dynamic range and compact form factor. IC Role / Device Role / Timing Role: ADC captures time-domain waveforms; DAC generates calibration test tones; both referenced to same 3 V source. Use Value: 72 dB SNR and –78 dB THD support >11-bit effective resolution, sufficient for 60 dB dynamic range spectral measurements. |
Use Scenario: Motor position/velocity feedback loop in industrial PLC-controlled motion systems. IC Role / Device Role / Timing Role: ADC reads encoder or current-sense amplifier output; DAC drives PWM modulator or analog actuator interface. Use Value: Asynchronous CONVST allows deterministic sampling aligned to motor commutation events, while LDAC enables jitter-free torque command updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit integrated ADC/DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865BSZ-REEL | 4-channel 14-bit ADC + 4-channel 12-bit DAC in 44-pin MQFP; higher resolution but larger footprint and no integrated references | Multi-channel data acquisition where channel density outweighs size constraints | Select AD7865BSZ-REEL only when 4 simultaneous analog inputs/outputs are required and external reference design is acceptable |
| AD7656ASTZ | 6-channel 16-bit SAR ADC only (no DAC); SPI interface; ±5 V supply; 250 kSPS per channel | High-resolution acquisition-only systems needing >12-bit fidelity and multi-channel parallel sampling | Choose AD7656ASTZ when DAC functionality is unnecessary and 16-bit DC accuracy is critical for sensor measurement |
Compared with AD7868BRZ-REEL, AD7865BSZ-REEL offers greater channel count and resolution but lacks on-chip references and increases PCB area, while AD7656ASTZ delivers superior ADC performance but omits DAC functionality entirely-making AD7868BRZ-REEL optimal for compact, self-contained I/O where matched ADC/DAC scaling and minimal external components are essential.
Availability
AD7868BRZ-REEL is available at Aetrix Electronics and suitable for digital signal processing systems, speech recognition front-ends, spectrum analysis instruments, DSP-based servo control, and industrial data acquisition requiring stable component supply over extended production lifecycles.
Supply support for AD7868BRZ-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 Norwood, MA, with design and manufacturing expertise spanning precision converters, amplifiers, and RF solutions.
The AD7868BRZ-REEL belongs to Analog Devices' LC2MOS precision converter family, engineered specifically for embedded DSP applications demanding tightly coupled, low-jitter analog I/O with minimal external components and industrial-grade reliability.
FAQ
What is the operating temperature range for the AD7868BRZ-REEL?
The AD7868BRZ-REEL is rated for industrial operation from –40°C to +85°C (B-grade version). This range is fully specified for all dynamic parameters including SNR, THD, and timing characteristics, and aligns with the "BR" ordering code in the Analog Devices datasheet. No derating is required within this span.
Does the AD7868BRZ-REEL require external reference components?
No, the AD7868BRZ-REEL integrates two temperature-compensated 3 V buried Zener references (RO ADC and RO DAC), each capable of sourcing up to 500 µA. These references are factory-trimmed to ±10 mV and exhibit ±25 ppm/°C typical drift. External references are optional only if custom scaling or improved long-term stability is needed.
How does the AD7868BRZ-REEL handle simultaneous ADC and DAC operations?
The AD7868BRZ-REEL supports concurrent operation via independent serial interfaces and asynchronous control: ADC conversion is triggered by CONVST, while DAC updates occur on LDAC falling edges. Their clocks (RCLK and TCLK) and frame signals (RFS/TFS) are electrically isolated, preventing interference during overlapping data transfers.
What package type and lead finish does the AD7868BRZ-REEL use?
The AD7868BRZ-REEL is supplied in a 28-pin plastic SOIC (Small Outline IC) package with 0.300" body width and standard gull-wing leads. It features a lead (Pb)-free, RoHS-compliant matte tin finish and is shipped in tape-and-reel format (REEL suffix), compatible with automated SMT assembly processes.
Can the AD7868BRZ-REEL's internal clock drive both ADC and DAC sections?
No-the AD7868BRZ-REEL's internal 2.0 MHz oscillator (enabled by tying CLK to VSS) serves only the ADC section. The DAC requires an external TCLK signal; there is no shared or derived clock path between the two subsystems. This separation ensures independent timing control and avoids cross-talk-induced jitter in sensitive applications.
AD7868BRZ-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
AD7868BRZ-REEL FAQ
1.How can I place an order for AD7868BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7868BRZ-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 AD7868BRZ-REEL reliable?
The price and inventory of AD7868BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7868BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7868BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7868BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7868BRZ-REEL?
AD7868BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7868BRZ-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 AD7868BRZ-REEL?
For technical support, including AD7868BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7868BRZ-REEL requirements.
6.How does Aetrix verify that AD7868BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7868BRZ-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 AD7868BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7868BRZ-REEL?
All AD7868BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7868BRZ-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 AD7868BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7868BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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