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Analog Devices Inc. AD7777AR-REEL
- Part No.:
- AD7777AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7777AR-REEL.pdf
- Description:
- IC ADC 10BIT 4CH HS 28-SOIC T/R
- Quantity:
- Payment:
- Shipping:
Inventory:705
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Product details
Overview
AD7777AR-REEL from Analog Devices is a 4-channel, 10-bit successive approximation register (SAR) analog-to-digital converter (ADC) with parallel microprocessor 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 dual-channel sampling for synchronized data acquisition in DSP systems.
For engineers reviewing the AD7777AR-REEL datasheet, AD7777AR-REEL pinout, AD7777AR-REEL application, or AD7777AR-REEL equivalent, key selection considerations include its 4-channel configuration, SOIC-28 package, BUSY/INT dual-mode flag, REFIN/REFOUT voltage reference architecture, and compatibility with TMS320 and ADSP-21xx processors.
Technical Context
The AD7777AR-REEL implements a track-and-hold front-end supporting up to 189 kHz input sine wave bandwidth at full-scale 2 VPP, with conversion timing governed by an external 8 MHz CLKIN. Its 10-bit SAR core delivers guaranteed no-missing-codes performance and channel-to-channel isolation of –90 dB at 100 kHz.
Control is managed via a 10-bit write-only register configuring channel selection (AIN1–AIN4), single/dual conversion mode (CR6), power-down (CR8), and BUSY/INT behavior (CR9). The device retains ADC register contents during power-down when no conversion is active, and features dedicated CREFIN decoupling (10 nF to AGND) for stable reference operation.
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 |
| Sampling Rate | 380.95 kSPS - maximum throughput with 8 MHz CLKIN; single conversion takes ≤14 tCLKIN |
| DC Accuracy | ±1 LSB relative accuracy - ensures monotonicity and endpoint linearity across full temperature range |
| Analog Input Range | VBIAS ± VSWING = 2.0 V ± 1.0 V - set by REFIN voltage; input referred to pseudo-ground at REFIN level |
| Reference Output | REFOUT = 2.0 V nominal ±0.1 V - low-impedance (5 Ω typ) buffered reference usable as VBIAS source |
| Power Consumption | 15 mA max in normal mode; 1.5 mA max in power-down - enables low-power system sleep states |
| Dynamic Performance | S/(N+D) = –56 dB min; THD = –60 dB min - validated at 99.88 kHz full-scale sine input |
Pinout & Package
AD7777AR-REEL is housed in a 28-lead SOIC (RW-28) package with standard JEDEC MS-012AC footprint, 0.3 inch body width, and 1.27 mm lead pitch. Thermal impedance θJA = 75°C/W; max power dissipation = 875 mW.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power Supply | +5 V ±5% main supply; bypassing with 4.7 µF tantalum + 0.1 µF ceramic required at pin |
| AGND / DGND | Analog & Digital Ground | Separate ground pins require star-point connection near device; RTN tied to AGND internally |
| AIN1–AIN4 | Analog Inputs | Four differential-capable inputs; each has ≥10 kΩ input resistance to AGND; range = REFIN ± (REFIN/2) |
| REFIN / REFOUT | Reference Interface | REFIN accepts 1.9–2.1 V external reference; REFOUT provides 2.0 V output (5 Ω output impedance) |
| CREFIN | Reference Decoupling | Must connect 10 nF capacitor to AGND; critical for high-speed ADC stability and noise rejection |
| DB0–DB9 | Parallel Data Bus | Bidirectional 10-bit bus; outputs drive 1.6 mA low / 200 µA high; compatible with 5 V TTL/CMOS logic |
| CS / RD / WR | Control Interface | Standard microprocessor strobes; WR rising edge initiates acquisition and conversion; CS enables bus |
| BUSY/INT | Status Flag | Configurable via CR9: BUSY (low during conversion) or INT (low after conversion completion) |
| CLKIN | Timing Input | Accepts 8 MHz clock (125 ns period); timing margins defined per Figure 1–3; tr/tf = 5 ns |
Key Features
| Feature | Design Value |
|---|---|
| Simultaneous Dual-Channel Sampling | CR6-controlled mode acquires two channels synchronously, enabling phase-coherent signal analysis |
| Integrated Reference Architecture | REFOUT provides stable 2.0 V bias; REFIN accepts external 1.9–2.1 V reference for precision scaling |
| Low-Power Power-Down Mode | CR8 activation reduces ICC to 1.5 mA; linear circuitry disabled while control logic remains active |
| Robust Microprocessor Interface | Compatible with TMS320C10/C14/C25, ADSP-2101/2105, and 80C196KB/KC with minimal wait states |
| High Channel Isolation | –90 dB typical crosstalk between AIN1–AIN4 at 100 kHz supports multi-signal integrity in dense layouts |
Applications
| Voice Recognition Front-End | DSP-Based Echo Cancellation |
|---|---|
Use Scenario: Digitizing microphone array signals in real-time voice command systems with multi-channel synchronization requirements. IC Role / Device Role / Timing Role: 4-channel ADC providing time-aligned samples to DSP engine; BUSY/INT flag coordinates interrupt-driven data transfer. Use Value: Simultaneous sampling on AIN1–AIN4 eliminates inter-channel phase skew, preserving acoustic beamforming accuracy. |
Use Scenario: Capturing near-end and far-end audio streams simultaneously in hands-free telephony systems. IC Role / Device Role / Timing Role: Dual-conversion mode (CR6 = 1) acquires both signals in lockstep; REFOUT supplies common bias to analog front-end. Use Value: –90 dB channel isolation prevents leakage between transmit/receive paths, improving echo return loss. |
| Industrial Motor Current Monitoring | Medical ECG Signal Conditioning |
Use Scenario: Sampling three-phase motor current and DC bus voltage in compact inverter drives. IC Role / Device Role / Timing Role: AIN1–AIN3 used for phase currents; AIN4 for DC link voltage; single-cycle readout minimizes latency. Use Value: ±1 LSB relative accuracy ensures precise RMS calculation over –40°C to +85°C industrial temperature range. |
Use Scenario: Converting amplified, filtered biopotential signals from electrode leads in portable ECG devices. IC Role / Device Role / Timing Role: Low-noise 10-bit conversion with 2.0 V internal reference simplifies analog front-end design. Use Value: 10 nF CREFIN decoupling and separate AGND/DGND pins reduce digital switching noise coupling into sensitive analog paths. |
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 |
|---|---|---|---|
| AD7776AR-REEL | Single-channel version (1 input); identical timing, accuracy, and interface; lacks AIN2–AIN4 and CR3–CR5 control bits | Used where only one analog signal requires digitization; lower pin count and board space | Select when channel count reduction justifies redesign; not pin-compatible due to fewer analog inputs |
| AD7778ASZ | 8-channel version in 44-lead PQFP; same 10-bit SAR core, REFOUT, and timing; adds AIN5–AIN8 and extended control register | Required for systems needing >4 synchronized inputs; higher pin count and thermal impedance (θJA = 95°C/W) | Choose for scalability to 8 channels; requires PCB layout change and thermal reassessment |
Compared with AD7776AR-REEL and AD7778ASZ, the AD7777AR-REEL uniquely balances channel count (4), package size (SOIC-28), and thermal performance (θJA = 75°C/W) for mid-density data acquisition without over-engineering.
Availability
AD7777AR-REEL is available at Aetrix Electronics and suitable for industrial motor control, medical signal acquisition, voice processing, and DSP-based instrumentation requiring stable component supply and long-term production continuity.
Supply support for AD7777AR-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, founded in 1965 and headquartered in Wilmington, MA.
The AD7776/AD7777/AD7778 family was designed specifically for high-speed, multichannel data acquisition in digital signal processing systems requiring tight channel matching, low-latency parallel interfacing, and integrated reference stability.
FAQ
What is the function of the CREFIN pin on the AD7777AR-REEL?
The CREFIN pin on the AD7777AR-REEL requires a 10 nF capacitor connected to AGND to stabilize the internal reference circuitry and ensure accurate 10-bit conversion performance. This capacitor filters high-frequency noise on the reference path and is mandatory for specified dynamic performance (S/(N+D), THD) and DC accuracy (±1 LSB relative accuracy). Omitting or undersizing this capacitor causes increased quantization noise and potential code missing.
How does the BUSY/INT pin operate in the AD7777AR-REEL?
The BUSY/INT pin on the AD7777AR-REEL functions as either a BUSY signal (CR9 = 0) or an interrupt flag (CR9 = 1), configurable via the control register. In BUSY mode, it goes low at conversion start and returns high upon completion. In INT mode, it goes low after conversion finishes and is reset high by the falling edge of WR or RD. This dual-mode behavior allows flexible timing coordination with host processors like TMS320 or ADSP-21xx families.
Can the AD7777AR-REEL operate with an external reference voltage?
Yes, the AD7777AR-REEL can operate with an external reference voltage applied to the REFIN pin, which must be within 1.9 V to 2.1 V for specified performance. The REFIN voltage directly sets both VBIAS (equal to REFIN) and VSWING (nominally REFIN/2), defining the analog input range as VBIAS ± VSWING. When using an external reference, the internal REFOUT remains available but should not be loaded to avoid affecting REFIN regulation.
What is the purpose of the CR8 bit in the AD7777AR-REEL control register?
The CR8 bit in the AD7777AR-REEL control register enables power-down mode: writing '1' disables all linear circuitry (ADC core, reference buffer, track-and-hold), reducing ICC from 15 mA to 1.5 mA. REFOUT is weakly pulled to AGND (5 kΩ), but CS, WR, and RD remain functional. Writing '0' restores normal operation and automatically initiates a new conversion cycle based on CR6 setting.
Does the AD7777AR-REEL support simultaneous sampling across all four channels?
No, the AD7777AR-REEL supports simultaneous sampling only across two channels (e.g., AIN1 + AIN2) via CR6 = 1, followed by sequential conversion. It does not perform true 4-channel simultaneous sampling. The device acquires two selected inputs in lockstep, then converts them one after the other, storing results in ADCREG1 and ADCREG2. For four independent channels, users must sequence conversions using CR0–CR2 and CR3–CR5 address bits.
AD7777AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- -
AD7777AR-REEL FAQ
1.How can I place an order for AD7777AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7777AR-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 AD7777AR-REEL reliable?
The price and inventory of AD7777AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7777AR-REEL is usually 5 days.
3.What payment methods are accepted for AD7777AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7777AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7777AR-REEL?
AD7777AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7777AR-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 AD7777AR-REEL?
For technical support, including AD7777AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7777AR-REEL requirements.
6.How does Aetrix verify that AD7777AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7777AR-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 AD7777AR-REEL meets industry standards.
7.What is the process for return or replacement of AD7777AR-REEL?
All AD7777AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7777AR-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 AD7777AR-REEL part is unused and in its original packaging.
Return procedure for AD7777AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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