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Analog Devices Inc. AD7776ARZ
- Part No.:
- AD7776ARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7776ARZ.pdf
- Description:
- IC ADC 10BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,182
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Product details
Overview
AD7776ARZ from Analog Devices is a 10-bit, single-channel, successive-approximation register (SAR) analog-to-digital converter (ADC) with parallel microprocessor interface, 380.95 kSPS maximum sampling rate, ±1 LSB relative accuracy, and integrated 2.0 V reference output. It operates from a single +5 V supply and supports VBIAS ± VSWING input range (e.g., 1 V to 3 V with 2.0 V REFIN), targeting precision data acquisition in DSP-based voice recognition and echo cancellation systems.
For engineers reviewing the AD7776ARZ datasheet, AD7776ARZ pinout, AD7776ARZ application, or AD7776ARZ equivalent, key selection considerations include its 10-bit resolution with guaranteed no missing codes, 5.5 tCLKIN + 70 ns max conversion time at 8 MHz clock, ±12 LSB full-scale error, dual-mode BUSY/INT flag, and SOIC-24 package compatibility with TMS320 and ADSP-210x microcontrollers.
Technical Context
The AD7776ARZ implements a track-and-hold front-end enabling accurate digitization of up to 189 kHz sine-wave inputs at full scale, aligned with its Nyquist-limited 378 kHz throughput. Its SAR architecture delivers deterministic conversion timing-14 tCLKIN cycles for single conversion-with acquisition occurring 4.5–5.5 tCLKIN after WR rising edge.
It features a configurable control register (CR0–CR9) that determines channel selection (single AIN only), power-down mode (CR8), BUSY/INT behavior (CR9), and half-scale test mode (CR7). The device uses two's complement output coding and supports direct interfacing to 8-/16-bit microprocessors via CS/WR/RD handshaking without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - Defines 1024 discrete output codes; 1 LSB = 1.95 mV for VSWING = 1.0 V. |
| Sampling Rate | 380.95 kSPS max - Achieved with 8 MHz CLKIN; enables real-time capture of audio-band signals up to 189 kHz. |
| DC Accuracy | ±1 LSB relative accuracy - Ensures monotonicity and no missing codes across full temperature range (–40°C to +85°C). |
| Dynamic Performance | –56 dB S/(N+D), –60 dB THD - Validated at 99.88 kHz full-scale sine input; meets requirements for voice and echo-cancellation DSP. |
| Power Consumption | 15 mA normal mode, 1.5 mA power-down - CR8-controlled low-power state with 500 µs wake-up time. |
| Reference Output | 2.0 V nominal REFOUT - Low-impedance (5 Ω typ) buffered reference usable as VBIAS source for analog inputs. |
| Digital Interface | Parallel 10-bit bus (DB0–DB9) with CS/WR/RD - Compatible with TMS320C10/C14/C25 and ADSP-2101/2105 with one wait state. |
Pinout & Package
AD7776ARZ is housed in a 24-lead SOIC (RW-24) package with exposed pad not present. Pin functions are electrically validated per Analog Devices' official pin configuration diagram and functional description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Supply Input | +5 V ±5% main power rail; requires local 4.7 µF + 0.1 µF bypassing to DGND. |
| AGND / DGND | Analog & Digital Ground | Separate ground pins mandate star-point connection near device to minimize noise coupling. |
| AIN | Analog Input | Single-ended input with 10 kΩ minimum input resistance; accepts VBIAS ± VSWING (e.g., 1 V–3 V). |
| REFIN | Reference Input | Accepts 1.9 V–2.1 V external reference; sets VBIAS = REFIN and VSWING = REFIN/2. |
| REFOUT | Reference Output | 2.0 V buffered output; drives CREFIN (10 nF to AGND) and can bias AIN directly. |
| CREFIN | Reference Decoupling | Must connect 10 nF capacitor to AGND; critical for stable internal reference operation. |
| RTN | Signal Return | Return path for analog input; internally tied to AGND but requires external low-impedance connection. |
| DB0–DB9 | Data Bus | Bidirectional 10-bit parallel interface; outputs two's complement ADC result or accepts control register writes. |
| CS / WR / RD | Control Inputs | Standard microprocessor strobes: CS enables device, WR initiates conversion, RD reads result. |
| BUSY/INT | Status Flag | Configurable as BUSY (low during conversion) or INT (low after completion) via CR9 bit. |
| CLKIN | Master Clock | 8 MHz input (125 ns period); defines all timing including acquisition (4.5–5.5 tCLKIN) and conversion (14 tCLKIN). |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed No Missing Codes | ±1 LSB differential nonlinearity ensures monotonic transfer function essential for closed-loop control. |
| Integrated Reference Buffer | 2.0 V REFOUT with 5 Ω output impedance supports direct AIN biasing and eliminates need for external reference IC. |
| Deterministic Timing Architecture | Fixed 14-clock-cycle conversion with known acquisition window enables precise system-level synchronization. |
| Low-Power Power-Down Mode | 1.5 mA ICC with CR8 = 1; REFOUT weakly pulled to AGND via 5 kΩ, allowing rapid wake-up (<500 µs). |
| Robust Microprocessor Interface | Compatible with TMS320, ADSP-210x, and 80C196 families using standard read/write strobes and no glue logic. |
Applications
| Voice Recognition Front-End | Echo Cancellation Signal Chain |
|---|---|
|
Use Scenario: Digitizing microphone preamplifier output in embedded voice assistant hardware operating at 380 kSPS. IC Role / Device Role / Timing Role: Primary ADC capturing full-bandwidth audio with <189 kHz input bandwidth and deterministic 14-clock conversion latency. Use Value: –56 dB S/(N+D) and –60 dB THD ensure clean spectral representation for MFCC extraction and neural network inference. |
Use Scenario: Sampling near-end speaker signal in hands-free telephony systems requiring real-time adaptive filtering. IC Role / Device Role / Timing Role: High-fidelity analog input stage feeding DSP core; BUSY/INT flag synchronizes DMA transfers to avoid buffer underrun. Use Value: Channel-to-channel isolation >90 dB prevents leakage from speaker output into microphone path during double-talk conditions. |
| Industrial Data Logger | DSP-Based Adaptive Filter |
|
Use Scenario: Capturing sensor outputs (e.g., vibration, temperature) in battery-powered condition monitoring nodes. IC Role / Device Role / Timing Role: Low-power acquisition node; CR8-controlled power-down reduces average current to <100 µA in sleep intervals. Use Value: 1.5 mA power-down current and 500 µs wake-up enable duty-cycled operation without sacrificing responsiveness. |
Use Scenario: Real-time coefficient update loop in active noise cancellation where ADC latency directly impacts filter stability. IC Role / Device Role / Timing Role: Time-critical sampling element; fixed 14 tCLKIN conversion allows predictable pipeline depth for LMS algorithm scheduling. Use Value: Acquisition time bounded to 5.5 tCLKIN + 70 ns ensures consistent sample alignment across frames for coherent FIR updates. |
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 |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, 200 kSPS max, no internal reference output. | Lacks REFOUT and parallel bus; requires external reference and level-shifting for 3.3 V controllers. | Choose ADS7822U only if lower resolution and serial interface are acceptable and board space is constrained. |
| MAX1113ECPP | 10-bit, parallel interface, 250 kSPS, ±0.5 LSB INL, 2.5 V reference input only. | No REFOUT pin; requires external 2.5 V reference and separate biasing network for VBIAS. | Select MAX1113ECPP when tighter INL is required and external reference infrastructure already exists. |
Compared with ADS7822U and MAX1113ECPP, AD7776ARZ uniquely integrates a 2.0 V REFOUT, supports full 380 kSPS parallel operation, and provides guaranteed no-missing-codes performance in a single SOIC-24 package-making it optimal for DSP-coupled audio and real-time control where timing determinism and reference simplicity are critical.
Availability
AD7776ARZ is available at Aetrix Electronics and suitable for voice recognition front-ends, echo cancellation signal chains, and industrial data loggers requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7776ARZ 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, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7776ARZ belongs to the AD777x family of high-speed SAR ADCs designed specifically for DSP-centric applications demanding low-latency, deterministic timing, and integrated reference functionality in compact packages.
FAQ
What is the maximum sampling rate supported by the AD7776ARZ?
The AD7776ARZ supports a maximum sampling rate of 380.95 kSPS when operated with an 8 MHz CLKIN. This rate is derived from its fixed 14-clock-cycle conversion time and accounts for acquisition overhead. At this rate, the device achieves a Nyquist frequency of 189 kHz, enabling accurate digitization of full-audio-band signals without aliasing when paired with appropriate anti-aliasing filtering.
Does the AD7776ARZ require an external reference voltage?
The AD7776ARZ does not require an external reference voltage to operate, as it provides a 2.0 V nominal REFOUT pin that can serve as the REFIN source. However, an external 1.9 V–2.1 V reference may be applied to REFIN for improved accuracy or system-level reference sharing. When using REFOUT, a 10 nF capacitor must be connected from CREFIN to AGND to stabilize the internal reference.
How does the BUSY/INT pin function on the AD7776ARZ?
The BUSY/INT pin on the AD7776ARZ is configurable via control register bit CR9. When CR9 = 0, it operates as a BUSY signal-going low at conversion start and returning high upon completion. When CR9 = 1, it functions as an interrupt-going low only after conversion finishes and remaining low until reset by a WR or RD falling edge. This dual-mode flexibility supports both polling and interrupt-driven host processor architectures.
Can the AD7776ARZ interface directly with a 3.3 V microcontroller?
The AD7776ARZ is a 5 V-only device: its digital inputs (CS, WR, RD, DB0–DB9) require VIH ≥ 2.4 V and VIL ≤ 0.8 V, and its outputs drive VOH ≥ 4.0 V (ISOURCE = 200 µA) and VOL ≤ 0.4 V (ISINK = 1.6 mA). Direct connection to a 3.3 V microcontroller is not recommended without level translation, as overvoltage stress may occur on 3.3 V I/O pins and logic thresholds may not be reliably met.
What is the purpose of the CREFIN pin on the AD7776ARZ?
The CREFIN pin on the AD7776ARZ is a dedicated decoupling node for the internal reference circuitry. A 10 nF capacitor must be connected from CREFIN to AGND to ensure stable operation of the 2.0 V reference generator and prevent noise-induced errors in the ADC transfer function. This capacitor is mandatory per the datasheet and omission results in degraded DC accuracy and dynamic performance.
AD7776ARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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:
- -
AD7776ARZ FAQ
1.How can I place an order for AD7776ARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7776ARZ 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 AD7776ARZ reliable?
The price and inventory of AD7776ARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7776ARZ is usually 5 days.
3.What payment methods are accepted for AD7776ARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7776ARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7776ARZ?
AD7776ARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7776ARZ 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 AD7776ARZ?
For technical support, including AD7776ARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7776ARZ requirements.
6.How does Aetrix verify that AD7776ARZ is sourced from the original manufacturer or authorized distributors?
All AD7776ARZ 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 AD7776ARZ meets industry standards.
7.What is the process for return or replacement of AD7776ARZ?
All AD7776ARZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7776ARZ, 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 AD7776ARZ part is unused and in its original packaging.
Return procedure for AD7776ARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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