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Analog Devices Inc. AD7778ASZ
- Part No.:
- AD7778ASZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 44-QFP
- Datasheet:
-
AD7778ASZ.pdf
- Description:
- IC ADC 10BIT SAR 44MQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,979
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Product details
Overview
AD7778ASZ from Analog Devices is a high-speed, 10-bit, 8-channel successive-approximation register (SAR) analog-to-digital converter with parallel digital interface, ±1 LSB relative accuracy, 380.95 kSPS maximum sampling rate, and integrated 2.0 V reference output. It operates from a single +5 V supply and supports simultaneous sampling of two channels for synchronized data acquisition in multichannel DSP systems.
For engineers reviewing the AD7778ASZ datasheet, AD7778ASZ pinout, AD7778ASZ application, or AD7778ASZ equivalent, key selection considerations include its 8-channel analog input architecture, 44-pin PQFP package, BUSY/INT dual-mode flag, REFIN/REFOUT voltage reference handling, and compatibility with TMS320 and ADSP-21xx microprocessors.
Technical Context
The AD7778ASZ implements a track-and-hold front-end supporting up to 189 kHz full-power input bandwidth and uses a 10-bit SAR core with two's complement output coding. Its control register (CR0–CR9) enables channel selection (AIN1–AIN8), single/dual conversion mode (CR6), power-down (CR8), and BUSY/INT functional configuration (CR9).
Conversion timing is clock-dependent: acquisition requires 4.5–5.5 tCLKIN, single conversion completes in ≤14 tCLKIN, and double conversion in ≤28 tCLKIN; with CLKIN = 8 MHz, total conversion time is ≤3.5 µs per channel. The device features separate AGND and DGND pins, RTN return path, and CREFIN decoupling requirement (10 nF to AGND).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - delivers 1024 discrete output codes with 1.95 mV LSB step at VSWING = 1.0 V |
| Sampling Rate | 380.95 kSPS - supports real-time capture of signals up to 189 kHz Nyquist frequency |
| DC Accuracy | ±1 LSB relative accuracy - ensures monotonic transfer function and no missing codes across temperature |
| Dynamic Performance | –56 dB S/(N+D), –60 dB THD - validated at 99.88 kHz full-scale sine input, suitable for voice and audio preprocessing |
| Channel Count | 8 analog inputs (AIN1–AIN8) - configurable for independent or simultaneous dual-channel sampling |
| Reference Output | REFOUT = 2.0 V ±0.1 V - provides stable bias (VBIAS) and swing (VSWING = 1.0 V) for all channels |
| Power Supply | VCC = 4.75 V to 5.25 V - single-supply operation with 15 mA normal mode current draw |
| Interface | Parallel 10-bit bus (DB0–DB9) with CS/WR/RD control - direct connection to 80C196, TMS320, and ADSP processors |
Pinout & Package
AD7778ASZ is housed in a 44-lead plastic quad flat pack (PQFP) with 0.8 mm lead pitch and exposed thermal pad. Pin assignments are fully defined in the official datasheet, including dedicated analog (AGND, RTN, AIN1–AIN8, REFIN, REFOUT, CREFIN) and digital (DGND, DB0–DB9, CS, WR, RD, CLKIN, BUSY/INT) terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog Input Channels | High-impedance (≥10 kΩ) differential-capable inputs referenced to VBIAS = REFIN; support ±1 V swing around 2.0 V |
| REFIN | Reference Voltage Input | Accepts 1.9 V–2.1 V external reference to set VBIAS and VSWING; input impedance ≥10 kΩ |
| REFOUT | Internal Reference Output | 2.0 V ±0.1 V buffered output; drives external circuitry with 5 Ω typical DC impedance |
| CREFIN | Reference Decoupling Node | Requires 10 nF capacitor to AGND to stabilize internal reference and ensure accurate conversion |
| RTN | Analog Signal Return | Common return path for all analog inputs; must be tied to AGND at package for optimal noise rejection |
| DB0–DB9 | Bidirectional Data Bus | 10-bit parallel interface: outputs ADC result (two's complement), inputs control register data |
| BUSY/INT | Configurable Status Flag | CR9-selectable mode: active-low BUSY during conversion or INT pulse after completion |
| CS, WR, RD | Control Strobes | Standard microprocessor interface signals; WR rising edge initiates acquisition and conversion |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Sampling | Two-channel synchronized acquisition (CR6 = 1) enables phase-coherent measurements across AIN pairs |
| Channel Matching | ±10 LSB bias offset match and ±10 LSB full-scale error match between all 8 channels |
| Low-Power Mode | 1.5 mA power-down current (CR8 = 1); automatic termination of ongoing conversions |
| Integrated Reference | On-chip 2.0 V REFOUT eliminates need for external reference in many applications |
| DSP Interface Ready | Timing-compliant with TMS320C10/C14/C25 and ADSP-2101/2105 - one wait state required |
| Robust Layout Support | Dedicated AGND/DGND pins and RTN return path simplify mixed-signal PCB grounding |
Applications
| Voice Recognition Front-End | Industrial Motor Control Feedback |
|---|---|
Use Scenario: Capturing multi-microphone audio streams for beamforming and speaker identification in embedded voice assistants. IC Role / Device Role / Timing Role: 8-channel SAR ADC digitizing analog microphone outputs with synchronized sampling for time-of-flight analysis. Use Value: 10-bit resolution and –60 dB THD preserve speech spectral integrity; simultaneous dual-channel mode captures correlated acoustic events without phase skew. | Use Scenario: Monitoring three-phase motor currents and rotor position sensors in closed-loop servo drives. IC Role / Device Role / Timing Role: Simultaneous sampling of current sense amplifiers and encoder feedback signals for precise torque and angle computation. Use Value: Channel-to-channel isolation >90 dB prevents cross-talk between high-current and precision position channels; 380 kSPS throughput supports 20 kHz control loop rates. |
| Medical ECG Signal Acquisition | Test & Measurement Data Logger |
Use Scenario: Digitizing multiple ECG leads and respiration sensor outputs in portable patient monitors. IC Role / Device Role / Timing Role: High-accuracy 10-bit conversion of low-amplitude biopotential signals referenced to internal 2.0 V bias. Use Value: ±1 LSB relative accuracy and ±12 LSB full-scale error ensure diagnostic-grade linearity; REFIN/REFOUT architecture simplifies analog front-end design. | Use Scenario: Recording vibration, temperature, and pressure waveforms from industrial machinery for predictive maintenance analytics. IC Role / Device Role / Timing Role: Parallel-interface ADC interfacing directly to ARM Cortex-M4 MCU for burst-mode high-speed logging. Use Value: 10-bit resolution at 380 kSPS enables 16-bit-equivalent effective resolution via oversampling; 44-pin PQFP allows compact layout in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit multichannel SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7779ASZ | 12-bit resolution, same 8-channel PQFP package, identical pinout and interface, higher S/(N+D) at –70 dB | Higher precision required for vibration analysis or high-fidelity audio capture | Select AD7779ASZ when 12-bit resolution and improved dynamic range outweigh cost and power trade-offs |
| ADS8588HIPM | 8-channel, 16-bit, SPI interface, 1 MSPS, external reference only, no integrated REFOUT | Systems requiring higher resolution and serial interface for reduced pin count | Choose ADS8588HIPM for applications needing 16-bit accuracy and FPGA/microcontroller SPI integration |
Compared with AD7778ASZ, AD7779ASZ offers higher resolution and dynamic performance in a drop-in compatible package, while ADS8588HIPM trades parallel simplicity for greater resolution and serial flexibility-neither replaces AD7778ASZ without interface or reference architecture changes.
Availability
AD7778ASZ is available at Aetrix Electronics and suitable for voice recognition front-ends, industrial motor control feedback systems, and portable medical ECG acquisition requiring stable component supply and long-term production continuity.
Supply support for AD7778ASZ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD777x family was designed specifically for high-speed, multichannel data acquisition in digital signal processing applications-including voice, motor control, and instrumentation-where parallel interface, channel matching, and integrated reference simplify system design.
FAQ
What is the maximum sampling rate supported by the AD7778ASZ?
The AD7778ASZ supports a maximum sampling rate of 380.95 kSPS when driven by an 8 MHz CLKIN. This corresponds to a minimum conversion time of 14 tCLKIN (≤1.75 µs) per single conversion. At this rate, the device achieves a Nyquist frequency of 189 kHz, enabling accurate digitization of full-scale sine waves up to that bandwidth. The AD7778ASZ datasheet specifies dynamic performance metrics-including –56 dB S/(N+D) and –60 dB THD-under these exact conditions.
Does the AD7778ASZ require an external reference voltage?
No, the AD7778ASZ does not require an external reference voltage because it includes an integrated 2.0 V REFOUT pin that can serve as the REFIN source. When REFOUT is connected to REFIN, the device self-biases with VBIAS = 2.0 V and VSWING = 1.0 V, establishing a 1 V to 3 V analog input range. Alternatively, an external 1.9 V–2.1 V reference may be applied to REFIN, but the AD7778ASZ itself generates and regulates its own reference internally.
How many analog input channels does the AD7778ASZ have, and how are they selected?
The AD7778ASZ has eight analog input channels: AIN1 through AIN8. Channel selection is controlled via the 3-bit CR0–CR2 field for single-channel operation or CR0–CR2 plus CR3–CR5 for simultaneous dual-channel sampling. All eight channels share the same input structure-VBIAS ± VSWING-with matching bias offset (±10 LSB) and full-scale error (±10 LSB) across channels, as confirmed in the AD7778ASZ datasheet specifications table.
What package type is used for the AD7778ASZ, and what are its thermal characteristics?
The AD7778ASZ is packaged in a 44-lead plastic quad flat pack (PQFP) with an exposed thermal pad. Its absolute maximum junction temperature is +150°C, and its thermal impedance is θJA = 95°C/W. The PQFP package supports 500 mW maximum power dissipation under standard JEDEC conditions. This package is distinct from the SOIC (AD7777AR) and PDIP (AD7777AN) variants in the same family and is specified exclusively for the AD7778ASZ ordering option.
Can the AD7778ASZ operate in a low-power mode, and how is it activated?
Yes, the AD7778ASZ supports a low-power mode with 1.5 mA typical supply current. This mode is activated by writing a logic high to bit CR8 in the 10-bit control register. Upon activation, all linear circuitry is disabled, REFOUT is weakly pulled to AGND (5 kΩ), and ongoing conversions terminate immediately. The device retains register contents and resumes normal operation within 500 µs after CR8 is cleared, making it suitable for duty-cycled data acquisition systems.
AD7778ASZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 44-QFP
- Packaging:
- Tray
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 2:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 44-MQFP (10x10)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7778ASZ FAQ
1.How can I place an order for AD7778ASZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7778ASZ 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 AD7778ASZ reliable?
The price and inventory of AD7778ASZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7778ASZ is usually 5 days.
3.What payment methods are accepted for AD7778ASZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7778ASZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7778ASZ?
AD7778ASZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7778ASZ 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 AD7778ASZ?
For technical support, including AD7778ASZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7778ASZ requirements.
6.How does Aetrix verify that AD7778ASZ is sourced from the original manufacturer or authorized distributors?
All AD7778ASZ 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 AD7778ASZ meets industry standards.
7.What is the process for return or replacement of AD7778ASZ?
All AD7778ASZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7778ASZ, 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 AD7778ASZ part is unused and in its original packaging.
Return procedure for AD7778ASZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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