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Analog Devices Inc. AD7828BRZ-REEL
- Part No.:
- AD7828BRZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7828BRZ-REEL.pdf
- Description:
- IC ADC 8BIT FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,139
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Product details
Overview
AD7828BRZ-REEL from Analog Devices is an 8-channel, 8-bit LC2MOS successive-approximation analog-to-digital converter with built-in track-and-hold, single 5 V supply operation, ±1/2 LSB total unadjusted error, and 2.5 µs per-channel conversion time. It digitizes 0 V to 5 V analog inputs across eight multiplexed channels and is used in real-time data acquisition systems for industrial process monitoring.
For engineers reviewing the AD7828BRZ-REEL datasheet, AD7828BRZ-REEL pinout, AD7828BRZ-REEL application, or AD7828BRZ-REEL equivalent, key selection criteria include its 8-channel multiplexing capability, no-external-clock half-flash architecture, open-drain RDY output, ±40°C to +85°C industrial temperature range, and compatibility with Z80, MC68000, and TMS32010 microprocessors.
Technical Context
The AD7828BRZ-REEL implements a half-flash conversion architecture using two 4-bit flash ADCs - one for MSBs and one for LSBs - with an internal 4-bit DAC bridging them. This eliminates the need for an external clock and enables deterministic 2.5 µs conversion time per channel.
It features a fully differential reference input (VREF(+) and VREF(–)) enabling ratiometric operation and flexible input span scaling, plus address-controlled 8-channel analog multiplexer with A0–A2 inputs and open-drain RDY/INT status outputs for microprocessor WAIT-state or polling-based interfacing in Mode 0 or Mode 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes over full-scale input range |
| Total Unadjusted Error | ±1/2 LSB max - ensures monotonicity and guarantees no missing codes |
| Conversion Time | 2.5 µs per channel - supports up to 50 kHz per-channel sampling rate on all 8 channels |
| Analog Input Bandwidth | 10 kHz full-scale signal handling - enables direct digitization of 157 mV/µs slew-rate signals without external sample-and-hold |
| Supply Voltage | 5 V ±5% - simplifies system power design with single-supply operation |
| Power Dissipation | 50 mW typical - low active power enables use in thermally constrained embedded systems |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments with guaranteed performance across range |
Pinout & Package
AD7828BRZ-REEL is packaged in a 28-lead plastic SOIC (R-28) surface-mount package, 15.6 mm × 7.6 mm × 2.35 mm, with gull-wing leads and standard JEDEC MS-013AD outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1, A2 | Multiplexer Address Inputs | Select one of eight analog input channels (AIN1–AIN8); latched on rising edge of RD in Mode 1 |
| AIN1–AIN8 | Analog Input Terminals | Single-ended, 0 V to 5 V input range; each channel shares common VREF(+) and VREF(–) |
| CS | Chip Select Input | Active-low enable for conversion initiation and data bus control; drives RDY low on falling edge |
| RD | Read Input | Active-low signal that triggers conversion start (Mode 0) or latches address (Mode 1) |
| RDY | Ready Output | Open-drain status signal - goes high-impedance at end of conversion to indicate valid DB0–DB7 data |
| INT | Interrupt Output | Active-low pulse signaling completion of conversion; returns high on rising edge of CS or RD |
| DB0–DB7 | Three-State Data Outputs | 8-bit parallel natural binary output; tri-stated until conversion completes and RDY releases |
| VREF(+), VREF(–) | Differential Reference Inputs | Define full-scale range (e.g., 5 V span → 19.5 mV/LSB); support offset and ratiometric configurations |
| VDD, GND | Power Supply Pins | 5 V single supply with 40–50 mW typical dissipation; GND serves as analog and digital reference |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer | Reduces board space and BOM count vs. multiple single-channel ADCs in multichannel DAQ systems |
| Built-in track-and-hold function | Eliminates need for external S/H circuitry when digitizing ≤10 kHz full-scale signals |
| No external clock required | Simplifies timing design and reduces EMI risk by removing clock distribution network |
| Microprocessor-compatible interface | Direct connection to Z80, MC68000, and TMS32010 via standard CS/RD control without glue logic |
| Tight channel-to-channel matching | ±1/4 LSB max mismatch enables accurate relative measurements across all 8 channels |
Applications
| Industrial Process Monitoring | Real-Time Speech Analysis |
|---|---|
|
Use Scenario: Continuous acquisition of temperature, pressure, and flow sensor outputs in PLC-based control cabinets. IC Role / Device Role / Timing Role: 8-channel simultaneous-sampling-capable ADC providing synchronized digitization of analog field signals for closed-loop feedback. Use Value: Enables single-chip replacement of four dual-channel ADCs, reducing PCB area by >35% while maintaining 10 kHz per-channel bandwidth. |
Use Scenario: Real-time spectral analysis of voice signals using banked band-pass filters feeding eight parallel analog paths. IC Role / Device Role / Timing Role: High-speed multiplexed ADC capturing time-aligned samples from filtered speech bands for FFT processing. Use Value: 2.5 µs conversion time allows 50 kHz effective sampling per channel, satisfying Nyquist for 20 kHz audio bandwidth with margin. |
| Embedded Test Equipment | Motor Drive Current Sensing |
|
Use Scenario: Portable handheld tester acquiring voltage/current waveforms from DUTs under dynamic load conditions. IC Role / Device Role / Timing Role: Primary data acquisition engine interfaced to ARM Cortex-M MCU via GPIO-controlled CS/RD handshake. Use Value: Single 5 V supply and 50 mW power draw extend battery life in portable instruments without compromising 8-channel coverage. |
Use Scenario: Sampling phase currents in 3-phase inverter stages using shunt resistors and op-amp conditioning networks. IC Role / Device Role / Timing Role: Isolated analog front-end ADC capturing synchronized current samples for field-oriented control algorithms. Use Value: ±1/2 LSB accuracy and ±1/4 LSB channel matching ensure precise torque estimation and minimize current loop instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, 8-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7828LN | Same architecture and pinout; commercial-grade (0°C to 70°C) with ±1/2 LSB error; PDIP-28 package | Not rated for industrial temperature range; unsuitable for cabinet-mounted equipment in uncontrolled ambient | Select AD7828BRZ-REEL for designs requiring extended temperature operation and surface-mount assembly. |
| MAX1138EEE+ | 8-channel, 8-bit SAR ADC; 3.3 V or 5 V supply; SPI interface; no built-in track-and-hold | Requires external S/H for >1 kHz signals; serial interface increases MCU overhead vs. parallel DB0–DB7 | Choose AD7828BRZ-REEL when parallel microprocessor interface, integrated track-and-hold, and deterministic 2.5 µs timing are critical. |
Compared with AD7828LN and MAX1138EEE+, the AD7828BRZ-REEL uniquely combines industrial temperature rating, SOIC packaging, parallel microprocessor interface, and integrated track-and-hold - making it optimal for space-constrained, thermally demanding, and timing-critical embedded DAQ systems.
Availability
AD7828BRZ-REEL is available at Aetrix Electronics and suitable for industrial process monitoring, real-time speech analysis, embedded test equipment, and motor drive current sensing requiring stable component supply and long-term production continuity.
Supply support for AD7828BRZ-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 AD7828BRZ-REEL belongs to Analog Devices' legacy high-speed data acquisition product line, designed specifically for cost-sensitive, microprocessor-based multichannel measurement systems requiring simplicity, speed, and reliability without external clocks or support components.
FAQ
What is the operating temperature range of the AD7828BRZ-REEL?
The AD7828BRZ-REEL is specified for operation from –40°C to +85°C, meeting industrial-grade environmental requirements. This range is confirmed in the Ordering Guide where "B" denotes the –40°C to +85°C grade and "R" indicates the SOIC (R-28) package. Performance parameters including total unadjusted error (±1/2 LSB), conversion time (2.5 µs), and power dissipation (50 mW typ) are guaranteed across this full range.
Does the AD7828BRZ-REEL require an external clock signal?
No, the AD7828BRZ-REEL does not require an external clock signal. Its half-flash conversion architecture uses two internal 4-bit flash ADCs and an inter-stage DAC to complete conversion in a fixed 2.5 µs time without clock dependency. This eliminates clock routing, jitter concerns, and external oscillator BOM cost - a key differentiator versus SAR or sigma-delta ADCs.
How many analog input channels does the AD7828BRZ-REEL support?
The AD7828BRZ-REEL supports eight single-ended analog input channels (AIN1 through AIN8), selected via the 3-bit address bus (A0, A1, A2). This is explicitly defined in the Functional Block Diagram, Pin Configurations, and Ordering Guide - distinguishing it from the 4-channel AD7824 family members. All eight channels share the same VREF(+) and VREF(–) reference inputs.
What package type is used for the AD7828BRZ-REEL?
The AD7828BRZ-REEL uses a 28-lead plastic SOIC (Small Outline Integrated Circuit) package designated R-28, with dimensions 15.6 mm × 7.6 mm × 2.35 mm and JEDEC MS-013AD compliance. The "R" in the part number confirms the SOIC variant, and "Z" indicates lead-free (RoHS-compliant) finish; "REEL" denotes tape-and-reel packaging for automated assembly.
Can the AD7828BRZ-REEL interface directly with a Z80 microprocessor?
Yes, the AD7828BRZ-REEL interfaces directly with the Z80 microprocessor in Mode 0, using standard CS and RD control lines. As shown in Figure 16 of the datasheet, the RDY output connects to the Z80's WAIT input to extend instruction cycles automatically during conversion. No address decoding logic or timing glue is needed - the ADC appears as memory-mapped I/O at addresses like C000–C007.
AD7828BRZ-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:
- 8
- Sampling Rate (Per Second):
- 50k
- Number of Inputs:
- 8
- 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:
- Flash
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7828BRZ-REEL FAQ
1.How can I place an order for AD7828BRZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828BRZ-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 AD7828BRZ-REEL reliable?
The price and inventory of AD7828BRZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828BRZ-REEL is usually 5 days.
3.What payment methods are accepted for AD7828BRZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828BRZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828BRZ-REEL?
AD7828BRZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828BRZ-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 AD7828BRZ-REEL?
For technical support, including AD7828BRZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828BRZ-REEL requirements.
6.How does Aetrix verify that AD7828BRZ-REEL is sourced from the original manufacturer or authorized distributors?
All AD7828BRZ-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 AD7828BRZ-REEL meets industry standards.
7.What is the process for return or replacement of AD7828BRZ-REEL?
All AD7828BRZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7828BRZ-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 AD7828BRZ-REEL part is unused and in its original packaging.
Return procedure for AD7828BRZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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