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Analog Devices Inc. AD7827BN
- Part No.:
- AD7827BN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7827BN.pdf
- Description:
- IC ADC 8BIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:16,245
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Product details
Overview
AD7827BN from Analog Devices is an 8-bit, 1 MSPS serial-output sampling ADC with on-chip track-and-hold and 2.5 V reference (±2% tolerance), operating from single 3 V ±10% or 5 V ±10% supply. It delivers 420 ns conversion time, 200 ns acquisition time, and supports 0 V to 2 V (3 V supply) or 0 V to 2.5 V (5 V supply) input range for real-time DSP interfacing in industrial data acquisition systems.
For engineers reviewing the AD7827BN datasheet, AD7827BN pinout, AD7827BN application, or AD7827BN equivalent, this page provides verified technical context, exact pin functions, confirmed DC/dynamic specifications, validated alternative options, and supply-ready procurement guidance - all specific to the plastic DIP (N-8) package variant.
Technical Context
The AD7827BN implements a half-flash architecture: a 4-bit flash ADC generates MSBs, followed by a second flash stage for LSBs, achieving full 8-bit resolution in ≤420 ns. Its track-and-hold acquires input within 200 ns and holds for 120 ns during conversion, enabling accurate sampling of up to 10 MHz analog signals at 1 MSPS.
It uses a 3-wire serial interface (SCLK, DOUT, RFS) synchronized to a continuous external clock; RFS falls at conversion end to signal valid data, and DOUT shifts out MSB-first on rising SCLK edges. Power-down is triggered automatically when CONVST remains low ≥530 ns after falling edge - no separate control line required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit straight binary output; LSB = VREF/256 (5 V) or 0.8×VREF/256 (3 V) |
| Conversion Time | 420 ns max; enables ≥1 MSPS throughput when paired with compatible DSP serial timing |
| Input Range | 0 V to 2.0 V @ 3 V supply; 0 V to 2.5 V @ 5 V supply - auto-selected via internal VDD detector |
| INL / DNL | ±0.5 LSB max each; guarantees monotonicity and no missing codes over full temperature range |
| SNR | 48 dB min @ fIN = 30 kHz, fSAMPLE = 1 MHz; sufficient for 7.7 ENOB in baseband applications |
| Power (3 V) | 8 mA typical normal operation; 1 µA max power-down current - enables ultra-low average power at reduced throughput |
| Reference | On-chip 2.5 V ±2% reference; eliminates external reference component but fixes scaling ratio |
Pinout & Package
AD7827BN is housed in an 8-lead, 0.3" wide plastic dual-in-line package (DIP, N-8). Pin spacing matches standard 0.1" grid; lead finish is tin-lead; RoHS compliance not specified in source documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CONVST | Convert Start / Power-Down Control | Falling edge initiates conversion and hold mode; state sampled ~530 ns later determines automatic power-down entry |
| 2 - VIN | Analog Input | Single-ended input with ESD protection diodes; accepts 0–2 V (3 V supply) or 0–2.5 V (5 V supply) |
| 3 - RFS | Receive Frame Sync Output | Active-low frame sync signal; falls at conversion end to align DSP serial read timing |
| 4 - GND | Analog/Digital Ground Reference | Common return for all circuitry; requires low-impedance connection to minimize noise coupling |
| 5 - VREF | Reference Input/Output | 2.5 V ±2% output when using internal reference; accepts external 2.5 V ±2% reference if preferred |
| 6 - DOUT | Serial Data Output | 3-state output; drives MSB-first on rising SCLK edges; enters high-Z after 8th bit |
| 7 - SCLK | Serial Clock Input | Accepts continuous external clock; defines serial bit rate and synchronizes RFS/DOUT timing |
| 8 - VDD | Positive Supply | 3 V ±10% or 5 V ±10%; powers analog and digital sections; enables auto-ranging input span detection |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Enables 420 ns conversion with single 8-bit result - faster than successive-approximation while lower power than full flash |
| Integrated track-and-hold amplifier | Acquires input within 200 ns and holds for precise 120 ns sampling window - eliminates external THA component |
| Automatic power-down via CONVST | Reduces average power to µA-level between conversions without software overhead or extra control pins |
| DSP-compatible 3-wire serial interface | Direct connection to TMS320C5x, ADSP-21xx, and DSP560xx without glue logic - RFS synchronizes frame boundaries |
| VDD-sensing input range selection | Auto-configures 0–2 V or 0–2.5 V full-scale range based on supply voltage - simplifies system-level voltage scaling |
Applications
| Industrial Process Monitoring | DSP-Based Motor Control Feedback |
|---|---|
|
Use Scenario: Real-time monitoring of temperature, pressure, and current sensors in PLC I/O modules operating across –40°C to +105°C. IC Role / Device Role / Timing Role: Single-channel sampling ADC capturing analog sensor outputs at up to 1 MSPS with deterministic 420 ns conversion latency. Use Value: On-chip 2.5 V reference and auto-ranging input eliminate calibration drift from supply variation; 8-bit resolution meets cost-sensitive sensor digitization requirements. |
Use Scenario: Sampling motor phase currents and back-EMF in closed-loop field-oriented control (FOC) systems using TI C5x or ADI SHARC processors. IC Role / Device Role / Timing Role: High-speed analog front-end providing synchronized current feedback to DSP serial port with RFS-aligned frame start. Use Value: 200 ns acquisition time ensures accurate capture of fast-rising current transients; automatic power-down reduces thermal load during idle PWM cycles. |
| Portable Test Equipment Signal Capture | High-Speed Data Logging in Harsh Environments |
|
Use Scenario: Battery-powered oscilloscope front-ends or handheld spectrum analyzers requiring low-power, high-throughput digitization. IC Role / Device Role / Timing Role: Low-voltage ADC operating from 3 V supply with 1 µA power-down current to extend battery life between triggers. Use Value: 3 V operation cuts power consumption nearly in half vs. 5 V mode; small DIP package allows compact PCB layout in space-constrained enclosures. |
Use Scenario: Vibration and acoustic monitoring in oil/gas downhole tools or railway axle counters exposed to shock, temperature extremes, and EMI. IC Role / Device Role / Timing Role: Robust sampling node delivering 48 dB SNR at 30 kHz input frequency under industrial EMC conditions. Use Value: Specified operation from –40°C to +105°C and 2 kV ESD rating ensure reliability; DIP package facilitates through-hole mounting for mechanical stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, serial-interface sampling ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7823BN | Same 8-bit resolution and 1 MSPS rate, but uses external reference only; no on-chip 2.5 V reference | Requires external precision reference (e.g., AD780); better long-term stability but higher BOM count | Select AD7823BN when reference accuracy >±0.1% is required and board space allows external component |
| MAX1113CPE+ | 8-bit, 1.25 MSPS, SPI-compatible interface; no RFS pin - uses CS and SCLK only; 2.5 V reference internal | Lacks frame-sync signaling; requires software-managed read timing instead of hardware RFS alignment | Select MAX1113CPE+ when interfacing to microcontrollers with SPI peripherals but no dedicated frame-sync input |
Compared with AD7827BN, AD7823BN trades integrated reference for improved reference flexibility, while MAX1113CPE+ replaces RFS-based synchronization with simpler SPI timing - both require layout and firmware changes, and neither is pin-compatible.
Availability
AD7827BN is available at Aetrix Electronics and suitable for industrial process monitoring, DSP-based motor control feedback, portable test equipment signal capture, and high-speed data logging in harsh environments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7827BN 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, headquartered in Norwood, MA, with design and manufacturing operations worldwide.
The AD7827BN belongs to Analog Devices' legacy high-speed sampling ADC product line, engineered specifically for real-time DSP interfacing in industrial and instrumentation applications where low-latency, low-power, and serial simplicity are critical.
FAQ
What is the maximum sampling rate supported by the AD7827BN?
The AD7827BN achieves a maximum throughput of 1 MSPS under specified conditions (VDD = 3 V or 5 V ±10%, fIN = 30 kHz). This rate is constrained by its 420 ns conversion time and requires a compatible DSP serial interface capable of sustaining the necessary SCLK frequency and RFS-aligned frame timing. Actual achievable rate depends on host processor serial port configuration and bus loading.
Does the AD7827BN require an external reference voltage?
No - the AD7827BN includes an on-chip 2.5 V reference with ±2% tolerance, accessible at the VREF pin. It can also accept an external 2.5 V ±2% reference applied to the same pin, but the internal reference is enabled by default and eliminates the need for external components unless tighter reference accuracy is required.
How does the AD7827BN handle different supply voltages (3 V vs. 5 V)?
The AD7827BN features an internal VDD detector that automatically selects the input voltage range: 0 V to 2.0 V when VDD < 3.8 V (3 V mode), and 0 V to 2.5 V when VDD > 4.1 V (5 V mode). This ensures correct full-scale scaling without external configuration, and the device operates across the full specified supply range (2.7–3.3 V or 4.5–5.5 V).
What is the function of the RFS pin on the AD7827BN?
The RFS (Receive Frame Sync) pin on the AD7827BN is an active-low output that signals the start of valid serial data. It falls at the end of conversion to synchronize the host DSP's serial read operation - ensuring that the first rising edge of SCLK after RFS fall captures the MSB. This hardware frame sync eliminates software polling and improves timing determinism in real-time systems.
Can the AD7827BN operate in a true power-down state between conversions?
Yes - the AD7827BN supports automatic power-down (Mode 2) triggered by holding CONVST low for ≥530 ns after its falling edge. In this state, supply current drops to 1 µA max, significantly reducing average power. The part powers up again on the next CONVST rising edge, with 1 µs (external ref) or 25 µs (internal ref) wake-up delay before conversion begins.
AD7827BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- SPI, DSP
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -40°C ~ 105°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7827BN FAQ
1.How can I place an order for AD7827BN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7827BN 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 AD7827BN reliable?
The price and inventory of AD7827BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7827BN is usually 5 days.
3.What payment methods are accepted for AD7827BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7827BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7827BN?
AD7827BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7827BN 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 AD7827BN?
For technical support, including AD7827BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7827BN requirements.
6.How does Aetrix verify that AD7827BN is sourced from the original manufacturer or authorized distributors?
All AD7827BN 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 AD7827BN meets industry standards.
7.What is the process for return or replacement of AD7827BN?
All AD7827BN units undergo pre-shipment inspection (PSI). If there is an issue with AD7827BN, 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 AD7827BN part is unused and in its original packaging.
Return procedure for AD7827BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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