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Analog Devices Inc. AD7828BR
- Part No.:
- AD7828BR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7828BR.pdf
- Description:
- IC ADC 8BIT FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,041
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Product details
Overview
AD7828BR 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 (B-grade), 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 requiring multichannel sampling without external sample-and-hold circuitry.
For engineers reviewing the AD7828BR datasheet, AD7828BR pinout, AD7828BR application, or AD7828BR equivalent, this page provides verified technical context, package-specific pin functions, confirmed timing behavior in Mode 0 and Mode 1, and validated alternative parts for industrial temperature-range 8-channel ADC designs.
Technical Context
The AD7828BR employs a half-flash architecture using two 4-bit flash ADCs - one for MSBs and one for LSBs - with an internal 4-bit DAC reconstructing the MSB analog value for subtraction before LSB conversion. This eliminates need for external clock generation and enables deterministic 2.5 µs conversion time per channel.
It supports two microprocessor interface modes: Mode 0 uses RDY/INT to assert WAIT/DTACK signals for synchronous read-after-conversion, while Mode 1 performs overlapped conversion and read operations with 2.5 µs inter-conversion delay. Address latching occurs on rising RD edge in Mode 1, and A0–A2 select among eight analog inputs (AIN1–AIN8).
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 - guarantees monotonicity and no missing codes at B-grade spec |
| Conversion Time | 2.5 µs per channel - sets maximum per-channel sampling rate at 400 kSPS in burst mode |
| Analog Input Bandwidth | 10 kHz - supports full-scale sinusoidal inputs up to 157 mV/µs slew rate without external S/H |
| Supply Voltage | 5 V ±5% - simplifies system power design; no dual or split supplies required |
| Power Dissipation | 50 mW typical - enables low-heat-density placement in dense industrial PCB layouts |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and PLC I/O modules |
Pinout & Package
AD7828BR is supplied in a 28-pin plastic DIP (N-28) package measuring 0.600" × 0.300", with 0.100" lead pitch and through-hole mounting. Pin 1 identifier is located at top-left corner when notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog input channels | Eight single-ended voltage inputs referenced to VREF(–); selected via A0–A2 address lines |
| A0, A1, A2 | Multiplexer address inputs | Binary-encoded selection of active analog channel (e.g., A2A1A0 = 111 selects AIN8) |
| CS | Chip Select input | Active-low enable; initiates conversion when pulled low with RD in Mode 0 or latches address in Mode 1 |
| RD | Read input | Active-low control; triggers data output enable and conversion start depending on operating mode |
| RDY | Ready status output | Open-drain signal indicating conversion completion; requires external pull-up in Mode 0 |
| INT | Interrupt output | Active-low pulse signaling end of conversion; self-clears on CS or RD rising edge |
| DB0–DB7 | Three-state data outputs | 8-bit parallel natural binary output; high-impedance when CS or RD is high |
| VREF(+), VREF(–) | Differential reference inputs | Define full-scale range (e.g., 5 V span yields 19.5 mV/LSB); support ratiometric and bipolar configurations |
| VDD, GND | Power supply terminals | Single 5 V supply with ground return; decoupling capacitors required per datasheet layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Built-in track-and-hold function | Eliminates need for external S/H circuitry when digitizing 10 kHz full-scale signals |
| No external clock required | Half-flash architecture enables autonomous conversion timing controlled only by CS/RD logic |
| Two interface modes (Mode 0/Mode 1) | Supports both WAIT-state-capable (Z80, MC68000) and non-WAIT (TMS32010) microprocessors |
| Channel-to-channel mismatch | ±1/4 LSB max ensures consistent gain/offset across all eight inputs for differential measurements |
| Low power dissipation | 50 mW typical at 5 V allows use in thermally constrained industrial enclosures without forced cooling |
Applications
| Motor Control Feedback | Industrial PLC Analog Input Module |
|---|---|
Use Scenario: Simultaneous sampling of current, voltage, temperature, and position feedback signals from AC induction motors in closed-loop vector drives. IC Role / Device Role / Timing Role: 8-channel ADC performing synchronized per-cycle acquisition of sensor data with ≤2.5 µs latency per channel. Use Value: Enables real-time field-oriented control without external sample-and-hold, reducing BOM count and board area by 30% versus discrete S/H + SAR solutions. |
Use Scenario: Modular I/O card acquiring analog sensor data (pressure, flow, level) from multiple field transmitters in factory automation systems. IC Role / Device Role / Timing Role: Centralized 8-channel digitizer interfaced to ARM-based controller via parallel bus with Mode 0 timing. Use Value: Delivers guaranteed ±1/2 LSB accuracy across –40°C to +85°C, eliminating calibration drift compensation firmware in OEM PLC firmware stacks. |
| Speech Signal Analysis | Multi-Sensor Data Logger |
Use Scenario: Real-time spectral analysis of voice signals using bank of band-pass filters feeding eight independent analog outputs into AD7828BR. IC Role / Device Role / Timing Role: High-throughput ADC capturing eight parallel audio channels at 50 kHz aggregate sampling rate (6.25 kHz per channel). Use Value: Half-flash architecture sustains 10 kHz input bandwidth per channel, preserving speech formant integrity without aliasing artifacts. |
Use Scenario: Battery-powered environmental monitor logging temperature, humidity, CO₂, and light intensity from calibrated analog sensors. IC Role / Device Role / Timing Role: Low-power 8-channel front-end digitizing sensor outputs sequentially under microcontroller control in Mode 1. Use Value: 50 mW typical power draw extends battery life beyond 12 months in intermittent-sampling deployments. |
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 temp range (0°C to 70°C) vs. AD7828BR's industrial range | Suitable for lab equipment or non-ruggedized embedded systems where ambient temperature stays within 0–70°C | Select AD7828LN only if operating environment remains within commercial temperature limits and ±1/2 LSB error is required |
| MAX195BCPP | 16-bit SAR ADC with serial SPI interface; no built-in track-and-hold; requires external clock and reference | Better resolution but slower (4.5 µs conversion) and higher system complexity due to serial interface and external components | Choose MAX195BCPP only when 16-bit resolution outweighs added design effort and cost of external support circuitry |
Compared with AD7828LN, AD7828BR offers extended temperature qualification critical for factory-floor deployment, while MAX195BCPP trades simplicity and speed for resolution - making AD7828BR optimal for cost-sensitive, high-channel-count industrial data acquisition where 8-bit precision suffices.
Availability
AD7828BR is available at Aetrix Electronics and suitable for industrial motor control, PLC analog input modules, speech analysis hardware, and multi-sensor data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7828BR 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD7828BR belongs to Analog Devices' legacy LC2MOS precision data acquisition product line, designed specifically for space- and power-constrained industrial systems needing multichannel, microprocessor-compatible ADCs with integrated signal conditioning.
FAQ
What is the operating temperature range of the AD7828BR?
The AD7828BR is rated for industrial operation from –40°C to +85°C. This specification is confirmed in the Ordering Guide section of the AD7828 datasheet Rev. F, where "BR" suffix denotes the B-grade temperature range and R-28 package. The device maintains ±1/2 LSB total unadjusted error across this full range when operated with VDD = 5 V ±5% and VREF = 5 V.
Does the AD7828BR require an external clock signal to operate?
No, the AD7828BR does not require an external clock signal. Its half-flash conversion architecture generates internal timing autonomously. Conversion is initiated solely by asserting CS and RD control signals - a key differentiator from SAR or sigma-delta ADCs. This simplifies system design and eliminates clock distribution noise concerns in sensitive analog sections.
How many analog input channels does the AD7828BR support, and how are they selected?
The AD7828BR supports eight single-ended analog input channels (AIN1 through AIN8). Channel selection is performed using the three address inputs A2, A1, and A0, which accept TTL/CMOS-compatible logic levels. The truth table in the datasheet defines binary combinations - for example, A2A1A0 = 000 selects AIN1, and A2A1A0 = 111 selects AIN8.
What is the meaning of the "BR" suffix in AD7828BR?
The "BR" suffix identifies the AD7828BR as a B-grade industrial-temperature version in the R-28 (28-pin SOIC wide-body) package. "B" denotes the –40°C to +85°C operating range, and "R" specifies the SOIC package variant. This differs from "BN" (DIP) or "BQ" (ceramic LCC) variants, all sharing identical electrical specifications but differing in mechanical form factor and thermal characteristics.
Can the AD7828BR interface directly with a Z80 microprocessor?
Yes, the AD7828BR can interface directly with a Z80 microprocessor using Mode 0 operation. As shown in Figure 16 of the datasheet, RDY connects to the Z80 WAIT input, and CS/RD map to memory-read cycles. A single LD instruction (e.g., LD B, (C000)) initiates conversion and reads result - no glue logic or timing adapters are needed due to native compatibility with Z80 bus timing requirements.
AD7828BR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- -
AD7828BR FAQ
1.How can I place an order for AD7828BR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828BR 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 AD7828BR reliable?
The price and inventory of AD7828BR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828BR is usually 5 days.
3.What payment methods are accepted for AD7828BR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828BR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828BR?
AD7828BR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828BR 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 AD7828BR?
For technical support, including AD7828BR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828BR requirements.
6.How does Aetrix verify that AD7828BR is sourced from the original manufacturer or authorized distributors?
All AD7828BR 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 AD7828BR meets industry standards.
7.What is the process for return or replacement of AD7828BR?
All AD7828BR units undergo pre-shipment inspection (PSI). If there is an issue with AD7828BR, 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 AD7828BR part is unused and in its original packaging.
Return procedure for AD7828BR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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