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Analog Devices Inc. AD7776AR-REEL
- Part No.:
- AD7776AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7776AR-REEL.pdf
- Description:
- IC ADC 10BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,180
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Product details
Overview
AD7776AR-REEL from Analog Devices is a 10-bit, single-channel, successive-approximation register (SAR) analog-to-digital converter with on-chip reference buffer, 5 V supply operation, ±1 LSB relative accuracy, and 380.95 kSPS maximum sampling rate. It interfaces via parallel 10-bit data bus (DB0–DB9) with CS/WR/RD control and supports single-conversion mode only. It is used in DSP-based voice recognition and echo cancellation systems requiring stable mid-speed digitization of conditioned analog signals.
For engineers reviewing the AD7776AR-REEL datasheet, AD7776AR-REEL pinout, AD7776AR-REEL application, or AD7776AR-REEL equivalent, this page delivers verified technical context, exact pin functionality, real-world use-value per application, and two confirmed alternative parts - all grounded in the AD7776-specific specification sheet Rev. A and SOIC-24 package documentation.
Technical Context
The AD7776AR-REEL implements a track-and-hold amplifier followed by a 10-bit SAR ADC core, operating at up to 380.95 kSPS with CLKIN = 8 MHz. Its input range is VBIAS ± VSWING (e.g., 2.0 V ± 1.0 V), defined by REFIN voltage, and it outputs two's complement codes. Conversion timing includes 4.5–5.5 tCLKIN acquisition and 14 tCLKIN conversion time.
It features a programmable BUSY/INT output (CR9-selectable), power-down mode (CR8), and half-scale test mode (CR7). The device lacks simultaneous sampling capability (CR6 is "don't care"), distinguishing it from AD7777/AD7778 variants. All digital I/Os are TTL-compatible with 0.4 V VOL and 4.0 V VOH.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - defines 1024 discrete output codes; LSB = 1.95 mV for VSWING = 1.0 V |
| Relative Accuracy | ±1 LSB max - ensures monotonicity and ≤0.1% endpoint nonlinearity over –40°C to +85°C |
| Sampling Rate | 380.95 kSPS max - achieved with 8 MHz CLKIN; supports real-time voice-band signal capture |
| S/(N+D) Ratio | –56 dB min - measured at 99.88 kHz full-scale sine wave; suitable for voice recognition front-ends |
| THD | –60 dB min - confirms low harmonic distortion for clean spectral representation in DSP pipelines |
| Power Consumption | 15 mA max in normal mode - enables low-power embedded DSP subsystems with 5 V supply |
| Reference Input Range | 1.9 V to 2.1 V - requires tight regulation; nominal 2.0 V sets VBIAS = 2.0 V and VSWING = 1.0 V |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive cabin electronics environments |
Pinout & Package
AD7776AR-REEL is housed in a 24-lead SOIC (RW-24) package with exposed pad not present. Pin functions are validated per AD7776-specific pin configuration diagram (Rev. A, p.4) and Pin Function Description (p.5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | +5 V power supply | Must be bypassed with 4.7 µF tantalum || 0.1 µF ceramic directly at pin to DGND |
| AGND / DGND | Analog and digital ground references | Require star-point connection near device; separation prevents noise coupling into ADC core |
| AIN | Analog input channel (single-ended) | Accepts VBIAS ± VSWING (e.g., 1 V to 3 V); 10 kΩ input resistance to AGND |
| REFIN | Reference voltage input | Defines VBIAS and VSWING; 1.9–2.1 V range required for specified performance |
| REFOUT | On-chip 2.0 V reference output | Can drive AIN bias; 5 Ω DC output impedance; ±2 mV load regulation (0 to ±500 µA) |
| CREFIN | Reference decoupling node | Requires 10 nF capacitor to AGND; critical for high-speed ADC stability and noise rejection |
| RTN | Signal return path | Internally connected to AGND; must tie externally to system analog ground point |
| DB0–DB9 | Bidirectional 10-bit data bus | Transfers ADC output (two's complement) or control register writes; TTL-level compatible |
| CS / WR / RD | Parallel interface controls | CS enables device; WR latches control data and starts conversion; RD reads ADCREG1 result |
| BUSY/INT | Status flag output | Configurable as BUSY (CR9 = 0) or INT (CR9 = 1); active-low, open-drain capable |
| CLKIN | Master clock input | Accepts 8 MHz square wave; tCLKIN period 125 ns min / 500 ns max; drives internal timing |
Key Features
| Feature | Design Value |
|---|---|
| Single-channel SAR architecture | Eliminates inter-channel timing skew and matching overhead; simplifies layout for mono-signal paths |
| Integrated 2.0 V reference buffer (REFOUT) | Reduces external component count; provides stable VBIAS without external op-amp or reference IC |
| TTL-compatible parallel interface | Direct connection to legacy DSPs (TMS320C10/C14/C25) and microcontrollers (80C196) without level-shifting |
| Power-down mode (1.5 mA ICC) | Enables rapid wake-up (<500 µs) and energy savings during idle intervals in battery-backed systems |
| Track-and-hold bandwidth >189 kHz | Supports faithful digitization of voice-band signals (≤4 kHz) and anti-aliasing filter design margin |
Applications
| Voice Recognition Front-End | Echo Cancellation System |
|---|---|
|
Use Scenario: Digitizing microphone preamplifier output in automotive voice-command modules. IC Role / Device Role / Timing Role: Single-channel ADC capturing 8 kHz sampled audio with 10-bit resolution and <500 µs latency. Use Value: ±1 LSB relative accuracy and –56 dB S/(N+D) ensure reliable phoneme classification under EMI-prone vehicle environments. |
Use Scenario: Sampling speaker output and microphone input simultaneously in hands-free telephony units. IC Role / Device Role / Timing Role: Primary ADC for near-end signal path; paired with second AD7776AR-REEL for far-end path in dual-board design. Use Value: Matched full-scale error (±12 LSB) and bias offset (±12 LSB) between units enable consistent gain calibration across signal chains. |
| Industrial Sensor Signal Conditioning | DSP-Based Adaptive Filter Node |
|
Use Scenario: Converting conditioned 4–20 mA loop current outputs from pressure/temperature transmitters. IC Role / Device Role / Timing Role: Isolated analog front-end ADC interfacing to isolated SPI-to-parallel bridge ICs. Use Value: REFOUT-driven VBIAS eliminates need for separate precision reference, reducing BOM cost and board area. |
Use Scenario: Feeding real-time sensor data into ADSP-2105-based adaptive noise cancellation algorithms. IC Role / Device Role / Timing Role: High-fidelity data source synchronized to DSP clock via shared CLKIN; supports 380 kSPS throughput. Use Value: –60 dB THD and –75 dB IMD preserve signal integrity for coefficient convergence in LMS filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7823ARZ | 8-bit resolution, 200 kSPS max, no on-chip reference; requires external REFIN and VBIAS generation | Limited to lower-accuracy industrial monitoring where 10-bit fidelity is unnecessary | Select when cost sensitivity outweighs resolution needs and external reference infrastructure exists |
| ADS7822U | 12-bit resolution, 200 kSPS, SPI interface, internal reference; no parallel bus or REFOUT buffer | Suitable for microcontroller-based designs with SPI peripherals but incompatible with legacy DSP parallel buses | Select for higher-resolution requirements and modern MCU integration, accepting interface redesign |
Compared with AD7776AR-REEL, AD7823ARZ trades resolution and integrated reference for lower unit cost, while ADS7822U upgrades resolution and simplifies reference design at the expense of parallel interface compatibility and reduced throughput.
Availability
AD7776AR-REEL is available at Aetrix Electronics and suitable for voice recognition front-ends, echo cancellation systems, and industrial sensor signal conditioning requiring stable component supply, long-term industrial temperature support (–40°C to +85°C), and legacy parallel bus compatibility.
Supply support for AD7776AR-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7776AR-REEL belongs to the AD777x family of high-speed SAR ADCs designed specifically for digital signal processing applications including voice recognition, echo cancellation, and adaptive filtering where dynamic performance and parallel interface simplicity are critical.
FAQ
What is the maximum sampling rate supported by the AD7776AR-REEL?
The AD7776AR-REEL supports a maximum sampling rate of 380.95 kSPS when driven by an 8 MHz CLKIN signal. This rate is derived from its 14 tCLKIN conversion time and is validated under full-scale sine wave conditions at 99.88 kHz. The AD7776AR-REEL does not support simultaneous sampling or double-conversion modes, so each sample corresponds to one complete acquisition-conversion cycle.
Does the AD7776AR-REEL include an internal voltage reference?
Yes, the AD7776AR-REEL provides a buffered 2.0 V reference output (REFOUT) with 5 Ω typical DC output impedance and ±2 mV load regulation over ±500 µA. This REFOUT can serve as the VBIAS reference for the analog input, eliminating the need for an external precision reference in many designs. However, the device still requires a 1.9–2.1 V voltage applied to REFIN to define VSWING and stabilize REFOUT.
Can the AD7776AR-REEL interface directly with a TMS320C25 DSP?
Yes, the AD7776AR-REEL is explicitly documented to interface with the TMS320C25 at 40 MHz using one wait state, as shown in Figure 8 of the Rev. A datasheet. Its TTL-compatible DB0–DB9 bus, CS/WR/RD control scheme, and timing parameters (e.g., t4 ≤ 60 ns, t5 ≤ 45 ns) align with the C25's bus protocol. The AD7776AR-REEL's BUSY/INT output must be monitored to avoid read corruption during conversion.
What is the purpose of the CREFIN pin on the AD7776AR-REEL?
The CREFIN pin on the AD7776AR-REEL is dedicated to decoupling the internal reference circuitry. A 10 nF capacitor must be connected from CREFIN to AGND to ensure stable operation and minimize noise coupling into the ADC core. This capacitor is not optional - omission causes degraded dynamic performance (S/(N+D), THD) and potential conversion errors, as confirmed in the "Circuit Description" and "Layout Hints" sections of the datasheet.
How does power-down mode affect the REFOUT pin of the AD7776AR-REEL?
In power-down mode (CR8 = 1), the AD7776AR-REEL disables its internal reference driver and weakly pulls REFOUT to AGND through a ~5 kΩ resistor. This reduces quiescent current to 1.5 mA but means REFOUT is no longer a stable 2.0 V source. Any external circuit relying on REFOUT for biasing must be designed to tolerate this pull-down or be disabled during power-down to prevent unintended current flow and power loss.
AD7776AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- 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:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7776AR-REEL FAQ
1.How can I place an order for AD7776AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7776AR-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 AD7776AR-REEL reliable?
The price and inventory of AD7776AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7776AR-REEL is usually 5 days.
3.What payment methods are accepted for AD7776AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7776AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7776AR-REEL?
AD7776AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7776AR-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 AD7776AR-REEL?
For technical support, including AD7776AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7776AR-REEL requirements.
6.How does Aetrix verify that AD7776AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7776AR-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 AD7776AR-REEL meets industry standards.
7.What is the process for return or replacement of AD7776AR-REEL?
All AD7776AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7776AR-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 AD7776AR-REEL part is unused and in its original packaging.
Return procedure for AD7776AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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