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Analog Devices Inc. AD7777ARZ-REEL
- Part No.:
- AD7777ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7777ARZ-REEL.pdf
- Description:
- IC ADC 10BIT SAR 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,702
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Product details
Overview
AD7777ARZ-REEL from Analog Devices is a 4-channel, 10-bit 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 - designed for high-speed DSP interfacing in voice recognition and adaptive filtering systems.
For engineers reviewing the AD7777ARZ-REEL datasheet, AD7777ARZ-REEL pinout, AD7777ARZ-REEL application, or AD7777ARZ-REEL equivalent, key selection criteria include channel count (4), resolution (10-bit), conversion timing (14 tCLKIN max), power-down current (1.5 mA), and simultaneous dual-channel sampling capability via CR6 control bit.
Technical Context
The AD7777ARZ-REEL implements a track-and-hold architecture supporting up to 189 kHz input sine wave bandwidth at full-scale 2 VPP, with acquisition time of 4.5–5.5 tCLKIN and conversion latency of 14 tCLKIN cycles. It uses a two's complement output coding scheme and supports both single-channel and simultaneous dual-channel sampling modes controlled by CR6.
Its microprocessor interface operates with CS/WR/RD handshaking, features BUSY/INT dual-mode flag (configurable via CR9), and retains ADC register contents during power-down when no conversion is active. Reference stability relies on external 10 nF CREFIN decoupling and internal REFOUT buffering with 5 Ω typical DC impedance.
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 endpoint linearity error stays within ±1 code across full input range. |
| Sampling Rate | 380.95 kSPS max - achieved with 8 MHz CLKIN; supports real-time voice and echo cancellation processing. |
| Power-Down Current | 1.5 mA max - enables low-power standby while preserving register state and enabling fast wake-up. |
| S/(N+D) Ratio | –56 dB min - measured at 99.88 kHz full-scale sine wave; critical for clean spectral representation in DSP. |
| Channel Isolation | –90 dB typ - minimizes crosstalk between AIN1–AIN4 during multi-channel acquisition. |
| Reference Output | 2.0 V nominal REFOUT with ±2 mV load regulation (0 to ±500 µA) - provides stable bias for input channels. |
| Logic Compatibility | 5 V CMOS/TTL - VOH ≥ 4.0 V at 200 µA, VOL ≤ 0.4 V at 1.6 mA; interfaces directly with TMS320, ADSP-210x, 80C196. |
Pinout & Package
AD7777ARZ-REEL is housed in a 28-lead SOIC (RW-28) package with exposed pad thermal enhancement. Pin functions are validated per Analog Devices' official pin configuration diagram and functional description table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | +5 V ±5% supply; requires local 4.7 µF + 0.1 µF bypassing to DGND for noise immunity. |
| AGND / DGND | Analog and digital ground references | Must be separated on PCB and joined at single-point star ground near device; prevents digital noise coupling into analog path. |
| AIN1–AIN4 | Four analog input channels | Accept VBIAS ± VSWING input range (e.g., 2.0 V ± 1.0 V); 10 kΩ minimum input resistance to AGND. |
| REFIN | Reference voltage input | 1.9 V to 2.1 V range sets VBIAS = REFIN and VSWING = REFIN/2; drives all channel bias levels. |
| REFOUT | Internal reference output | Nominal 2.0 V output; can source/sink ±500 µA with ±2 mV regulation - usable as external VBIAS source. |
| CREFIN | Reference decoupling node | Requires mandatory 10 nF capacitor to AGND; stabilizes internal reference and reduces switching noise. |
| RTN | Signal return path | Connected internally to AGND; must be tied to system analog ground at package for accurate common-mode rejection. |
| DB0–DB9 | Bidirectional 10-bit data bus | Transfers ADC results (ADCREG1/ADCREG2) and accepts control register writes; high-impedance when CS = 1. |
| CS / RD / WR | Parallel interface controls | Enable read/write operations; WR rising edge initiates acquisition and conversion; RD reads register contents. |
| BUSY/INT | Status flag output | Configurable via CR9: BUSY mode (low during conversion) or INT mode (low after completion and cleared by RD/WR). |
| CLKIN | Master clock input | Accepts 8 MHz clock (125 ns period); timing governs acquisition, conversion, and interface handshaking. |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous dual-channel sampling | CR6 bit enables synchronized acquisition on two selected channels (e.g., AIN1 + AIN3), essential for phase-coherent signal analysis. |
| On-chip 2.0 V reference buffer | REFOUT delivers stable 2.0 V with 5 Ω output impedance and ±2 mV load regulation - eliminates need for external reference in many designs. |
| Power-down mode with register retention | CR8 = 1 disables linear circuitry (ICC = 1.5 mA), pulls REFOUT weakly to AGND, but preserves ADCREG1/ADCREG2 contents if no conversion is active. |
| Channel-to-channel offset and gain matching | Bias offset error match ≤10 LSB and full-scale error match ≤10 LSB between AIN1–AIN4 - enables precise differential measurements without per-channel calibration. |
| DSP-optimized timing interface | Supports direct connection to TMS320C10/C14/C25 and ADSP-2101/2105 with documented wait-state configurations and verified timing margins. |
Applications
| Voice Recognition Front-End | Echo Cancellation System |
|---|---|
|
Use Scenario: Digitizing microphone array outputs in real-time speech processing units with low-latency requirements. IC Role / Device Role / Timing Role: 4-channel SAR ADC captures synchronized audio samples at 380.95 kSPS; BUSY/INT flag coordinates DMA transfers to DSP core. Use Value: ±1 LSB relative accuracy and –56 dB S/(N+D) ensure clean spectral representation for MFCC extraction and speaker identification. |
Use Scenario: Sampling near-end and far-end audio signals simultaneously in hands-free telephony or conferencing systems. IC Role / Device Role / Timing Role: AD7777ARZ-REEL performs simultaneous dual-channel sampling (CR6 = 1) to preserve phase alignment between reference and error paths. Use Value: –90 dB channel-to-channel isolation prevents leakage from reference signal into error path, improving LMS filter convergence. |
| Adaptive Filtering Hardware | Industrial Sensor Data Acquisition |
|
Use Scenario: Real-time coefficient adaptation in hardware-accelerated FIR/IIR filters for vibration suppression or noise shaping. IC Role / Device Role / Timing Role: Parallel DB0–DB9 interface delivers low-latency ADC data to FPGA-based filter engine; WR rising edge triggers deterministic acquisition start. Use Value: 14 tCLKIN conversion time (1.75 µs @ 8 MHz) enables sub-3 µs loop latency - critical for >100 kHz control bandwidths. |
Use Scenario: Multi-sensor monitoring in PLC I/O modules where compact size and 4-channel integration reduce BOM count. IC Role / Device Role / Timing Role: AD7777ARZ-REEL serves as front-end digitizer for thermocouple, strain gauge, and current-loop inputs using programmable VBIAS/VSWING scaling. Use Value: REFIN/REFOUT flexibility allows single 2.0 V reference to bias all four channels, simplifying analog front-end design and improving channel matching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7777BRZ-REEL | Same silicon, extended temperature grade (–40°C to +105°C); identical pinout, timing, and electrical specs. | Required for industrial environments exceeding +85°C ambient; not suitable for cost-sensitive commercial designs. | Select AD7777BRZ-REEL only when extended temperature operation is mandated; AD7777ARZ-REEL remains optimal for standard industrial grade. |
| ADS7822U | Single-channel, 12-bit SAR ADC with SPI interface; no internal reference; 200 kSPS max; different package (SO-8). | Lacks multi-channel synchronization and parallel interface; requires external reference and level-shifting for 5 V systems. | Choose ADS7822U only for space-constrained, low-channel-count designs where SPI compatibility outweighs speed and integration trade-offs. |
Compared with AD7777BRZ-REEL, the AD7777ARZ-REEL offers identical performance at lower cost and qualification scope; compared with ADS7822U, it delivers 4× channel density, parallel interface throughput, and integrated reference - reducing total system component count and layout complexity.
Availability
AD7777ARZ-REEL is available at Aetrix Electronics and suitable for voice recognition front-ends, echo cancellation systems, and adaptive filtering hardware requiring stable component supply, long-term production continuity, and guaranteed industrial-grade temperature performance.
Supply support for AD7777ARZ-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, serving precision instrumentation, industrial automation, and communications markets.
The AD7777ARZ-REEL belongs to the AD777x family of high-speed, multi-channel SAR ADCs engineered specifically for real-time DSP interfacing - emphasizing low-latency parallel access, channel matching, and robust reference integration.
FAQ
What is the maximum sampling rate supported by the AD7777ARZ-REEL?
The AD7777ARZ-REEL achieves a maximum sampling rate of 380.95 kSPS when operated with an 8 MHz CLKIN clock. This rate is derived from its 14 tCLKIN conversion time plus acquisition overhead, and is validated under full-scale 99.88 kHz sine wave test conditions per the official datasheet.
Does the AD7777ARZ-REEL require an external reference voltage?
The AD7777ARZ-REEL does not require an external reference: it provides a nominal 2.0 V REFOUT that can serve as the REFIN source, establishing VBIAS = 2.0 V and VSWING = 1.0 V. However, an external 1.9 V to 2.1 V reference may be applied to REFIN for improved accuracy or custom scaling - the device supports both configurations.
How does the BUSY/INT pin function on the AD7777ARZ-REEL?
The BUSY/INT pin on the AD7777ARZ-REEL operates in two configurable modes: when CR9 = 0, it acts as a BUSY signal (goes low during conversion); when CR9 = 1, it acts as an interrupt (goes low after conversion completes and resets on RD or WR falling edge). Its behavior is fully defined in the control register specification and timing diagrams.
Can the AD7777ARZ-REEL perform simultaneous sampling on all four channels?
No - the AD7777ARZ-REEL supports simultaneous sampling on only two channels at a time (e.g., AIN1 and AIN3), selected via CR0–CR2 and CR3–CR5 address bits when CR6 = 1. It does not support true 4-channel simultaneous acquisition; sequential sampling across all four channels occurs at full throughput rate with inter-channel skew governed by WR-triggered timing.
What is the power consumption of the AD7777ARZ-REEL in normal operation?
In normal operation, the AD7777ARZ-REEL draws a maximum of 15 mA from the VCC supply (at +5 V ±5%), as specified under ICC, Normal Mode conditions with CS = RD = +5 V and CR8 = 0. This includes all analog and digital circuitry active, and aligns with worst-case dynamic loading during continuous conversion.
AD7777ARZ-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:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 4
- 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:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7777ARZ-REEL FAQ
1.How can I place an order for AD7777ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7777ARZ-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 AD7777ARZ-REEL reliable?
The price and inventory of AD7777ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7777ARZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7777ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7777ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7777ARZ-REEL?
AD7777ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7777ARZ-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 AD7777ARZ-REEL?
For technical support, including AD7777ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7777ARZ-REEL requirements.
6.How does Aetrix verify that AD7777ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7777ARZ-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 AD7777ARZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7777ARZ-REEL?
All AD7777ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7777ARZ-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 AD7777ARZ-REEL part is unused and in its original packaging.
Return procedure for AD7777ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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