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Analog Devices Inc. AD7776AR
- Part No.:
- AD7776AR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7776AR.pdf
- Description:
- IC ADC 10BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,666
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Product details
Overview
AD7776AR from Analog Devices is a 10-bit, 380.95 kSPS successive approximation register (SAR) analog-to-digital converter with single-channel input, on-chip reference buffer, and parallel microprocessor interface. It delivers ±1 LSB relative accuracy, –56 dB S/(N+D), and operates from a +5 V supply across –40°C to +85°C for real-time DSP acquisition in voice recognition and sensor digitization systems.
For engineers reviewing the AD7776AR datasheet, AD7776AR pinout, AD7776AR application, or AD7776AR equivalent, key selection considerations include its 24-pin SOIC package, 10-bit resolution with guaranteed no missing codes, BUSY/INT dual-mode flag, REFIN/REFOUT reference architecture, and compatibility with TMS320 and ADSP-210x processors.
Technical Context
The AD7776AR implements a track-and-hold front-end supporting up to 189 kHz input sine wave bandwidth at full throughput, with acquisition time of 4.5–5.5 tCLKIN and conversion time of 14 tCLKIN. Its control register is 10-bit wide and write-only, with CR8 enabling power-down mode (1.5 mA ICC) and CR9 selecting BUSY or INT behavior.
It uses a pseudo-ground input structure where VBIAS = REFIN and VSWING = REFIN/2, yielding a nominal 1 V to 3 V input range when REFIN = 2.0 V. The device features two independent ADC registers (ADCREG1 only active for AD7776AR), and supports both single-conversion and simultaneous-sampling modes - though CR6 is "don't care" for this single-channel variant.
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 - maximum sustained throughput with 8 MHz CLKIN; enables Nyquist-limited 189 kHz signal capture |
| DC Accuracy | ±1 LSB relative accuracy - ensures monotonicity and no missing codes across full temperature range |
| S/(N+D) Ratio | –56 dB min - measured at 99.88 kHz full-scale sine wave; critical for voice and audio DSP fidelity |
| Power Consumption | 15 mA max in normal mode - compatible with 5 V, 75 mW system power budgets; drops to 1.5 mA in power-down |
| Reference Range | 1.9 V to 2.1 V at REFIN - sets VBIAS and VSWING; REFOUT provides buffered 2.0 V nominal output |
| Input Voltage Range | VBIAS ± VSWING - e.g., 1.0 V to 3.0 V with 2.0 V REFIN; requires external decoupling capacitor (CREFIN = 10 nF) |
Pinout & Package
AD7776AR is housed in a 24-lead small-outline integrated circuit (SOIC) package (RW-24), with exposed pad not present and standard JEDEC MS-013AC footprint. Pin functions are electrically validated per Analog Devices' official pin configuration diagram and functional description.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | +5 V ±5% supply; bypassed with 4.7 µF tantalum || 0.1 µF ceramic at pin |
| AGND / DGND | Analog and digital ground returns | Must be separated on PCB and joined at single-point star ground near device |
| AIN | Analog input channel | Single-ended input referenced to VBIAS; 10 kΩ input resistance to AGND |
| REFIN | Reference voltage input | Accepts 1.9–2.1 V external reference; sets VBIAS = REFIN and VSWING = REFIN/2 |
| REFOUT | Internal reference output | Nominal 2.0 V buffered output; 5 Ω DC impedance; load current ≤ ±500 µA |
| CREFIN | Reference decoupling node | Requires 10 nF capacitor to AGND for stable high-speed ADC operation |
| RTN | Signal return path | Connected internally to AGND; used as low-impedance return for AIN and REFIN |
| DB0–DB9 | Bidirectional data bus | 10-bit parallel interface; outputs ADC result or accepts control register writes |
| CS, RD, WR | Microprocessor control | Standard 3-wire parallel interface; RD/WR edges latch data; CS enables bus access |
| CLKIN | Master clock input | Accepts 8 MHz TTL/CMOS clock; tCLKIN period 125–500 ns; min high/low times 50/40 ns |
| BUSY/INT | Status flag output | Configurable via CR9: active-low BUSY during conversion or INT after completion |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed no missing codes | ±1 LSB differential nonlinearity ensures monotonic transfer function for closed-loop control |
| On-chip reference buffer | REFOUT delivers stable 2.0 V ±0.1 V with ±2 mV load regulation (0 to ±500 µA), eliminating external reference IC |
| Low-power power-down mode | ICC drops to 1.5 mA with CR8 = 1; REFOUT weakly pulled to AGND via 5 kΩ; fast 500 µs wake-up |
| Dual-mode status flag | BUSY/INT pin configurable via CR9 to support either polling (BUSY) or interrupt-driven firmware (INT) |
| Robust microprocessor interface | Compatible with TMS320C10/C14/C25 and ADSP-2101/2105; truth table guarantees deterministic read/write timing |
Applications
| Voice Recognition Front-End | Industrial Sensor Digitization |
|---|---|
Use Scenario: Capturing microphone or acoustic transducer signals in embedded voice command systems operating at ≤100 kHz bandwidth. IC Role / Device Role / Timing Role: Primary ADC digitizing analog audio path; synchronized to 8 MHz system clock; provides 10-bit samples to DSP core. Use Value: –56 dB S/(N+D) and –60 dB THD meet SNR requirements for phoneme discrimination; 380.95 kSPS supports oversampling for noise shaping. | Use Scenario: Converting output of precision pressure, temperature, or strain sensors in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Standalone signal conditioner ADC interfacing directly to microcontroller GPIO or parallel bus. Use Value: ±1 LSB relative accuracy and bias offset error ≤±12 LSB ensure <0.1% FSR measurement linearity over industrial temperature range. |
| Motor Control Current Sensing | Test & Measurement Data Acquisition |
Use Scenario: Sampling shunt voltage in real-time motor phase current feedback loops requiring sub-microsecond latency. IC Role / Device Role / Timing Role: High-speed acquisition node feeding current loop PID controller; triggered by WR edge with 14-cycle conversion latency. Use Value: 4.5–5.5 tCLKIN acquisition window and deterministic timing enable precise sampling alignment with PWM switching edges. | Use Scenario: Modular benchtop DAQ channel in portable instrumentation where size, power, and parallel interface simplify host integration. IC Role / Device Role / Timing Role: Self-contained ADC subsystem with on-board REFOUT and CREFIN decoupling; minimal external components required. Use Value: 24-pin SOIC footprint and 15 mA active power allow compact, low-heat designs; BUSY/INT flag supports both polled and interrupt firmware architectures. |
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 buffer | Lacks REFOUT and REFIN support; requires external reference and level-shifting for 5 V systems | Choose ADS7822U only if lower resolution and serial interface are acceptable and board space is constrained |
| MAX1113ECM+ | 10-bit, 250 kSPS, SPI interface, internal 2.048 V reference, 16-pin QSOP | No parallel bus; lower throughput; fixed internal reference limits input range flexibility | Select MAX1113ECM+ when migrating from parallel to SPI-based designs and reference flexibility is secondary to footprint reduction |
Compared with ADS7822U and MAX1113ECM+, the AD7776AR uniquely combines 10-bit accuracy, 380.95 kSPS parallel throughput, and integrated REFIN/REFOUT architecture - making it optimal for legacy microprocessor-based systems requiring minimal external components and deterministic timing.
Availability
AD7776AR is available at Aetrix Electronics and suitable for voice recognition front-ends, industrial sensor digitization, and motor control current sensing requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for AD7776AR 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 belongs to the AD777x family of high-speed SAR ADCs designed specifically for real-time digital signal processing applications including voice, audio, and industrial sensor acquisition where parallel interface, on-chip reference, and guaranteed monotonicity are essential.
FAQ
What is the maximum sampling rate supported by the AD7776AR?
The AD7776AR supports a maximum sampling rate of 380.95 kSPS when driven by an 8 MHz CLKIN. This corresponds to a conversion time of 14 tCLKIN cycles and enables accurate digitization of signals up to 189 kHz (Nyquist frequency). The device maintains this rate across its full operating temperature range of –40°C to +85°C, and the timing is validated per the official Analog Devices timing specifications table.
Does the AD7776AR require an external reference voltage?
The AD7776AR does not require an external reference voltage but supports it via the REFIN pin (1.9 V to 2.1 V). It also provides an internal 2.0 V nominal REFOUT, which can serve as the reference source. When REFOUT is used, REFIN is left unconnected or tied to REFOUT, and the input range becomes VBIAS ± VSWING = 2.0 V ± 1.0 V. This eliminates need for external reference ICs in many applications.
How is the BUSY/INT pin configured on the AD7776AR?
The BUSY/INT pin on the AD7776AR is configured via control register bit CR9: when CR9 = 0, the pin functions as an active-low BUSY signal that remains low during conversion; when CR9 = 1, it acts as an active-low INT signal that goes low after conversion completes and is reset by the falling edge of WR or RD. This dual-mode capability is confirmed in the AD7776/AD7777/AD7778 datasheet Pin Function Description section.
What package type is used for the AD7776AR?
The AD7776AR is packaged in a 24-lead small-outline integrated circuit (SOIC) with RW-24 option code, per the official Analog Devices ordering guide. This package has standard JEDEC MS-013AC dimensions (7.5 mm × 12.8 mm), gull-wing leads, and is RoHS-compliant. It is distinct from the PDIP (N-28) and PQFP (S-44) packages used for AD7777 and AD7778 variants.
Can the AD7776AR operate in power-down mode, and what is its quiescent current?
Yes, the AD7776AR supports power-down mode activated by writing '1' to control register bit CR8. In this mode, all linear circuitry is disabled, REFOUT is weakly pulled to AGND (5 kΩ), and ICC drops to 1.5 mA maximum. Power-up time to full operational specification is 500 µs. These values are specified in the Power Requirements section of the AD7776/AD7777/AD7778 datasheet Rev. A.
AD7776AR 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:
- -
AD7776AR FAQ
1.How can I place an order for AD7776AR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7776AR 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 reliable?
The price and inventory of AD7776AR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7776AR is usually 5 days.
3.What payment methods are accepted for AD7776AR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7776AR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7776AR?
AD7776AR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7776AR 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?
For technical support, including AD7776AR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7776AR requirements.
6.How does Aetrix verify that AD7776AR is sourced from the original manufacturer or authorized distributors?
All AD7776AR 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 meets industry standards.
7.What is the process for return or replacement of AD7776AR?
All AD7776AR units undergo pre-shipment inspection (PSI). If there is an issue with AD7776AR, 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 part is unused and in its original packaging.
Return procedure for AD7776AR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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