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Analog Devices Inc. AD7868BR-REEL
- Part No.:
- AD7868BR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7868BR-REEL.pdf
- Description:
- IC INTERFACE SPECIALIZED 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,620
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Product details
Overview
AD7868BR-REEL 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 - both sharing independent 3 V buried Zener references. It delivers 83 kHz ADC throughput, 3 µs DAC settling time, 72 dB SNR (B-grade), and operates from ±5 V supplies with ±3 V analog I/O range. It is used in DSP servo control and high-speed modem signal chains where synchronized analog input/output sampling is required.
For engineers reviewing the AD7868BR-REEL datasheet, AD7868BR-REEL pinout, AD7868BR-REEL application, or AD7868BR-REEL equivalent, this page provides verified functional identity, SOIC-28 package mapping, confirmed 24-pin DIP / 28-pin SOIC dual-package availability, real-world timing constraints (e.g., 10 µs conversion time), and two validated alternative parts for 12-bit mixed-signal I/O replacement scenarios.
Technical Context
The AD7868BR-REEL implements separate serial interfaces for ADC (RFS/RCLK/DR) and DAC (TFS/TCLK/DT), each using open-drain outputs with external pull-up resistors (4.7 kΩ for RFS/DR, 2 kΩ for RCLK). Its internal 2.0 MHz laser-trimmed oscillator eliminates need for external clocking on the ADC side, while asynchronous CONVST and LDAC inputs enable precise timing control independent of serial data transfer.
It features dual on-chip 3 V references (RO ADC and RO DAC), both temperature-compensated (±25 ppm/°C typ), each capable of sourcing up to 500 µA. The ADC uses a track-and-hold amplifier with <2 µs acquisition time and 500 kHz 0.1 dB bandwidth; the DAC output buffer supports ±3 V into 2 kΩ//100 pF with 1 MHz small-signal bandwidth and 30 nV/√Hz noise density.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 12 bits with guaranteed no missing codes; enables 1.46 mV LSB step size over ±3 V full-scale range. |
| ADC Throughput Rate | 83 kHz maximum; determined by 10 µs conversion time + <2 µs track/hold acquisition - sets Nyquist limit at 41.5 kHz. |
| DAC Settling Time | 3 µs to ±1/2 LSB; ensures stable analog output within one sample period when updating at 83 kHz rates. |
| SNR (ADC & DAC) | 72 dB minimum (B-grade); defines usable dynamic range of ~11.7 effective bits for clean signal reconstruction. |
| Reference Accuracy | 3.00 V ±10 mV at +25°C; supports <±1 LSB full-scale error matching between ADC and DAC when shared. |
| Power Dissipation | 130 mW typical (±5 V supplies); allows operation in thermally constrained DSP modules without forced cooling. |
| Analog I/O Range | ±3 V bipolar; compatible with standard op-amp interface stages and differential driver/receiver circuits. |
Pinout & Package
AD7868BR-REEL is housed in a 28-pin plastic SOIC (Small Outline IC) package, 0.300" wide body, with gull-wing leads. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard SOIC convention (counterclockwise from pin 1).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–2, 27–28 | VDD / VSS Power Supply | +5 V and –5 V supply pins; dual VDD/VSS pairs ensure low-impedance return paths for analog and digital sections. |
| 3, 26 | AGND / DGND | Separate analog and digital ground pins; must be connected to respective system ground planes with minimal impedance. |
| 4, 25 | RO ADC / RO DAC | Independent 3 V reference outputs; each sources up to 500 µA - RO ADC typically feeds RI DAC for matched full-scale calibration. |
| 5, 24 | VIN / VOUT | ADC input and DAC output terminals; both support ±3 V bipolar swing with 0.3 Ω output impedance (VOUT) and 9 kΩ input impedance (VIN). |
| 6–11, 18–23 | Serial Interface Pins (RFS, RCLK, DR, TFS, TCLK, DT, LDAC, CONVST, CONTROL, CLK) | Asynchronous, open-drain serial I/O with external pull-ups; enables connection to TI TMS320-series DSPs and other controllers without level-shifting. |
| 12, 17 | RI DAC / AGND | DAC reference input and auxiliary analog ground; RI DAC accepts 2.85–3.15 V reference - internally buffered before DAC core. |
| 13–16 | NC / DGND / CONTROL / CLK | Pin 13 = NC; Pin 14 = DGND; Pin 15 = CONTROL (0 V = gated RCLK, –5 V = continuous RCLK); Pin 16 = CLK (VSS = enable internal 2 MHz oscillator). |
Key Features
| Feature | Design Value |
|---|---|
| Integrated ADC + DAC + References | Eliminates need for 3+ discrete components and external reference trimming in 12-bit I/O designs - reduces BOM count and layout area. |
| Asynchronous CONVST and LDAC | Enables deterministic sampling and output update timing independent of serial bus activity - critical for closed-loop DSP servo control. |
| Internal 2.0 MHz Oscillator | Laser-trimmed to ±5% accuracy; removes external crystal/clock source requirement and simplifies PCB routing for ADC timing. |
| SOIC-28 + DIP-24 Dual Packaging | Allows drop-in replacement between prototyping (DIP) and production (SOIC) without redesign - AD7868BR-REEL is the SOIC variant. |
| 72 dB SNR (B-grade) | Validated across –40°C to +85°C; ensures consistent audio and spectrum analysis performance in industrial environments. |
Applications
| DSP Servo Control | High-Speed Modem Signal Chain |
|---|---|
Use Scenario: Real-time position feedback and actuator drive in CNC motion controllers using TI C2000 or ADSP-21xx DSPs. IC Role / Device Role / Timing Role: Simultaneous ADC sampling of motor current/voltage and DAC generation of PWM-complementary drive signals with sub-microsecond timing alignment. Use Value: Eliminates inter-chip skew between analog input and output paths - improves loop stability and reduces jitter-induced torque ripple. |
Use Scenario: Full-duplex analog front-end in V.34/V.90 modems requiring simultaneous transmit waveform synthesis and receive signal digitization. IC Role / Device Role / Timing Role: ADC captures incoming analog line signal at 83 kHz while DAC reconstructs outgoing QAM symbols - both referenced to same 3 V source for gain tracking. Use Value: Shared on-chip references reduce full-scale mismatch between Tx/Rx paths - improves echo cancellation convergence and SNR consistency. |
| Spectrum Analysis Instrumentation | Speech Synthesis Engine |
Use Scenario: Portable FFT-based spectral analyzer with battery-powered ARM Cortex-M7 host and analog sensor inputs. IC Role / Device Role / Timing Role: ADC acquires wideband sensor data (DC–41.5 kHz) with 72 dB SNR; DAC outputs calibrated test tones for system self-test. Use Value: On-chip track-and-hold enables accurate capture of transient signals without external S&H - preserves phase coherence across frequency bins. |
Use Scenario: Embedded text-to-speech module in medical assistive devices using LPC or WaveNet-style synthesis algorithms. IC Role / Device Role / Timing Role: DAC generates smooth 16-kHz audio waveforms with <3 µs settling; ADC monitors microphone input for voice activation detection. Use Value: Matched 12-bit resolution and ±3 V range simplify anti-aliasing and reconstruction filter design - reduces external component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit mixed-signal I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7868BN | Same die, 24-pin plastic DIP package; identical electrical specs but larger footprint and no tape-and-reel option. | Preferred for lab prototyping and through-hole assembly; not suitable for automated SMT lines. | Select AD7868BN only if DIP form factor is required - AD7868BR-REEL is the production-ready SOIC variant. |
| AD7865BS | Quad 14-bit ADC (no DAC); 4-channel, 100 kSPS, SPI interface; higher resolution but no integrated output capability. | Used where multi-channel high-precision acquisition is needed without analog output - requires external DAC for closed-loop use. | Choose AD7865BS only when >12-bit ADC resolution is mandatory and DAC functionality is implemented separately. |
Compared with AD7868BN and AD7865BS, the AD7868BR-REEL uniquely combines matched 12-bit ADC/DAC, dual references, and SOIC-28 packaging - making it the only single-chip solution for space-constrained, synchronous analog I/O in DSP-based embedded systems.
Availability
AD7868BR-REEL is available at Aetrix Electronics and suitable for DSP servo control, high-speed modem signal chains, spectrum analysis instrumentation, and speech synthesis engines requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for AD7868BR-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 Wilmington, MA.
The AD7868BR-REEL belongs to Analog Devices' LC2MOS precision mixed-signal converter family, designed specifically for embedded DSP systems requiring tightly coupled analog input and output with minimal external components.
FAQ
What is the operating temperature range for the AD7868BR-REEL?
The AD7868BR-REEL is rated for operation from –40°C to +85°C (B-grade). This range is explicitly specified in the Ordering Guide and confirmed across all dynamic and dc parameters in the datasheet. The part is not qualified for extended military or automotive temperature grades - those require the T-version (AD7868T), which is unavailable in SOIC packaging.
Does the AD7868BR-REEL include an internal clock generator?
Yes, the AD7868BR-REEL includes a factory-laser-trimmed 2.0 MHz internal oscillator for ADC timing. It is enabled by tying the CLK pin to VSS. The oscillator's mark/space ratio is 40/60 to 60/40, and conversion time remains 10 µs max - identical to operation with an external TTL clock.
Can the AD7868BR-REEL's ADC and DAC share the same reference voltage?
Yes - the AD7868BR-REEL's RO ADC pin can be directly connected to the RI DAC pin to provide a common 3 V reference for both converters. This configuration minimizes full-scale gain mismatch and is recommended in Figure 4 of the datasheet for applications requiring tight ADC-DAC tracking.
What is the maximum capacitive load allowed on the AD7868BR-REEL's reference outputs?
The AD7868BR-REEL's RO ADC and RO DAC pins support a maximum capacitive load of 50 pF for stable operation. Driving larger loads (e.g., >50 pF) requires a 200 Ω series resistor per Figure 2 in the datasheet - otherwise, reference regulation degrades and DAC/ADC full-scale accuracy suffers.
Is the AD7868BR-REEL pin-compatible with other AD7868 variants?
No - the AD7868BR-REEL (28-pin SOIC) is not pin-compatible with AD7868AN/BN/BQ (24-pin DIP/Cerdip). Pin counts, layouts, and pin functions differ significantly: SOIC adds 4 extra pins (including NC and additional GND), and pin 1 location/numbering is incompatible. Board redesign is required for package substitution.
AD7868BR-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
AD7868BR-REEL FAQ
1.How can I place an order for AD7868BR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7868BR-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 AD7868BR-REEL reliable?
The price and inventory of AD7868BR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7868BR-REEL is usually 5 days.
3.What payment methods are accepted for AD7868BR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7868BR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7868BR-REEL?
AD7868BR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7868BR-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 AD7868BR-REEL?
For technical support, including AD7868BR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7868BR-REEL requirements.
6.How does Aetrix verify that AD7868BR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7868BR-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 AD7868BR-REEL meets industry standards.
7.What is the process for return or replacement of AD7868BR-REEL?
All AD7868BR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7868BR-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 AD7868BR-REEL part is unused and in its original packaging.
Return procedure for AD7868BR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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