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Analog Devices Inc. AD7828BRZ
- Part No.:
- AD7828BRZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7828BRZ.pdf
- Description:
- IC ADC 8BIT FLASH 28SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,213
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Product details
Overview
AD7828BRZ 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 full-scale 10 kHz sinusoidal signals (157 mV/µs slew rate) across all eight inputs without external sample-and-hold circuitry, targeting real-time data acquisition in industrial control and instrumentation systems.
For engineers reviewing the AD7828BRZ datasheet, AD7828BRZ pinout, AD7828BRZ application, or AD7828BRZ equivalent, key selection criteria include its 8-channel multiplexed architecture, Mode 0/Mode 1 microprocessor interface flexibility, open-drain RDY output requiring external pull-up, and compatibility with Z80, MC68000, and TMS32010 buses without clock generation.
Technical Context
The AD7828BRZ implements a half-flash conversion architecture using two 4-bit flash ADCs-one for MSBs and one for LSBs-driven by an internal 4-bit DAC that reconstructs and subtracts the MSB approximation from the input. This eliminates need for external clocking and enables deterministic 2.5 µs conversion time per channel.
Its analog input structure inherently performs sampling and holding during the first ~1 µs of conversion, allowing stable 1/2 LSB measurement of 10 kHz signals. The device supports fully differential reference inputs (VREF(+) and VREF(–)), enabling ratiometric operation, offset input ranges, and adjustable full-scale spans down to 2 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - delivers 256 discrete digital codes over full-scale range |
| Total Unadjusted Error | ±1/2 LSB max - guarantees monotonicity and no missing codes without user calibration |
| Conversion Time | 2.5 µs per channel - enables 50 kHz per-channel sampling rate on all 8 inputs |
| Analog Input Bandwidth | 10 kHz - supports full-scale sinusoidal signals up to 157 mV/µs slew rate without external S/H |
| Supply Voltage | 5 V ±5% - simplifies system power design with single-rail operation |
| Power Dissipation | 50 mW typical - low thermal load suitable for dense PCB layouts |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments (B-grade) |
Pinout & Package
AD7828BRZ is packaged in a 28-lead plastic DIP (N-28) with 0.6" body width, 0.100" lead pitch, and through-hole mounting. Pin 1 identifier is located at top-left corner when viewed from top with notch facing up.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN8 | Analog Input Channels | Eight single-ended inputs selectable via A0–A2 address lines; support 0 V to 5 V unipolar or ±4 V bipolar (with external op amp) |
| A0, A1, A2 | Multiplexer Address Inputs | Binary-encoded channel selection (A2 only active on AD7828); latched on rising edge of RD in Mode 1 |
| CS | Chip Select | Active-low enable; initiates conversion when pulled low with RD in Mode 0, or latches address in Mode 1 |
| RD | Read Strobe | Active-low control; triggers conversion start and enables three-state DB0–DB7 outputs |
| RDY | Ready Output | Open-drain status signal indicating conversion completion; requires external 5 kΩ pull-up to VDD |
| INT | Interrupt Output | Active-low pulse signaling end of conversion; returns high on rising edge of CS or RD |
| DB0–DB7 | Data Bus Outputs | Three-state TTL-compatible outputs delivering 8-bit natural binary result; high-impedance until conversion completes |
| VREF(+), VREF(–) | Differential Reference Inputs | Define zero-to-full-scale span; support ratiometric sensing and programmable gain via reference scaling |
| VDD, GND | Power Supply | Single 5 V supply with decoupling recommended (47 µF + 0.1 µF per datasheet Figure 5) |
Key Features
| Feature | Design Value |
|---|---|
| Half-flash conversion architecture | Eliminates need for external clock generation and enables deterministic 2.5 µs conversion timing |
| Inherent track-and-hold function | Stabilizes input for ~1 µs after conversion start, enabling accurate 10 kHz signal digitization without external components |
| Fully differential reference interface | Allows flexible input range configuration (e.g., 0–2 V, ±4 V) and ratiometric operation with sensor bridges |
| Two-mode microprocessor interface | Mode 0 supports WAIT-state microprocessors (Z80, MC68000); Mode 1 supports non-WAIT systems (TMS32010) with pipelined reads |
| LC2MOS process technology | Delivers 50 mW typical power dissipation and robust ESD protection (4000 V HBM) in industrial temperature range |
Applications
| Industrial Data Acquisition | Real-Time Speech Analysis |
|---|---|
Use Scenario: Simultaneous monitoring of eight sensor outputs (temperature, pressure, flow) in PLC-based control cabinets with limited board space and thermal budget. IC Role / Device Role / Timing Role: 8-channel analog front-end ADC performing synchronized sampling at 50 kHz per channel with inherent track-and-hold eliminating external S/H ICs. Use Value: Reduces BOM count by two components per channel and cuts PCB area by 35% versus discrete S/H + SAR ADC solutions while maintaining 10 kHz signal fidelity. |
Use Scenario: Real-time spectral analysis of voice signals using eight parallel band-pass filters feeding into a DSP engine for phoneme recognition. IC Role / Device Role / Timing Role: High-speed multiplexed ADC capturing time-aligned samples from eight filter outputs with sub-microsecond inter-channel skew. Use Value: Enables frame-synchronized 8-channel capture at 50 kHz per channel, meeting Nyquist requirement for 20 kHz audio bandwidth without anti-aliasing filter complexity. |
| Embedded Instrumentation | Motor Control Feedback |
Use Scenario: Portable multimeter or handheld oscilloscope requiring battery-efficient, compact analog acquisition with >10 kHz bandwidth per channel. IC Role / Device Role / Timing Role: Low-power 8-bit ADC operating from single 5 V rail, interfacing directly to Z80 or 8051 microcontrollers via standard memory-mapped I/O. Use Value: Achieves 50 mW typical power consumption and eliminates level-shifting logic, extending battery life by 22% versus 3.3 V ADCs with interface buffers. |
Use Scenario: Closed-loop servo drive measuring current, voltage, and rotor position feedback from eight analog sensors in real time. IC Role / Device Role / Timing Role: Deterministic 2.5 µs conversion per channel ensures consistent phase alignment across motor phase measurements critical for field-oriented control. Use Value: Guarantees <100 ns inter-channel timing skew between sampled currents, enabling precise torque ripple suppression in PMSM drives. |
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 temperature range (0°C to 70°C) and ±1/2 LSB error spec | Suitable for lab equipment or consumer-grade instruments where extended temperature operation is unnecessary | Select AD7828LN when cost sensitivity outweighs industrial environmental requirements and full –40°C to +85°C qualification is not mandated. |
| MAX1138CPI+ | Successive-approximation architecture; 8-channel, 8-bit; 3.3 V or 5 V supply; no built-in track-and-hold | Requires external S/H for >1 kHz signals; lower power (25 mW) but higher external component count | Choose MAX1138CPI+ only if system already includes precision S/H circuitry and 3.3 V supply dominance justifies redesign effort. |
Compared with AD7828LN, the AD7828BRZ provides guaranteed operation at –40°C ambient and tighter long-term stability in thermal cycling environments; compared with MAX1138CPI+, it eliminates external S/H components and associated layout complexity while delivering identical resolution and comparable conversion speed.
Availability
AD7828BRZ is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, real-time speech analysis, and motor control feedback systems requiring stable component supply with full industrial temperature qualification and traceable sourcing.
Supply support for AD7828BRZ 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 AD7828BRZ belongs to Analog Devices' legacy LC2MOS precision data acquisition product line, designed specifically for cost-sensitive, space-constrained industrial systems requiring multichannel analog input with minimal external components and deterministic timing.
FAQ
What is the maximum analog input frequency supported by the AD7828BRZ without external sample-and-hold?
The AD7828BRZ supports full-scale 10 kHz sinusoidal inputs (157 mV/µs slew rate) without external sample-and-hold due to its inherent track-and-hold function active during the first ~1 µs of conversion. This capability applies to all eight channels simultaneously, enabling real-time multi-sensor acquisition in industrial control applications where the AD7828BRZ serves as the primary analog front-end.
Does the AD7828BRZ require an external clock signal for conversion?
No, the AD7828BRZ does not require an external clock signal. Its half-flash conversion architecture uses internal timing controlled solely by CS and RD strobes, eliminating clock generation circuitry and reducing EMI susceptibility. This simplifies system design and ensures deterministic 2.5 µs conversion time per channel in both Mode 0 and Mode 1 operation of the AD7828BRZ.
How does the AD7828BRZ handle reference voltage configuration for bipolar input ranges?
The AD7828BRZ supports bipolar operation via its fully differential VREF(+) and VREF(–) inputs. When used with an external op-amp signal conditioner like the AD544 (as shown in datasheet Figure 12), it achieves ±4 V input range with complementary offset binary output coding. The AD7828BRZ itself does not generate bias-it relies on external circuitry to shift and scale the analog input relative to the reference terminals.
What is the purpose of the RDY pin on the AD7828BRZ, and how must it be connected?
The RDY pin on the AD7828BRZ is an open-drain status output that goes low when CS falls and returns to high-impedance when conversion completes and valid data appears on DB0–DB7. It requires an external 5 kΩ pull-up resistor to VDD (per datasheet Figure 14) to drive microprocessor WAIT inputs. Leaving RDY unconnected or tying it directly to GND disables Mode 0 ready signaling and forces use of Mode 1 operation for the AD7828BRZ.
Can the AD7828BRZ operate with a 3.3 V digital interface while using a 5 V analog supply?
No-the AD7828BRZ is specified for single 5 V supply operation only. Its digital inputs (CS, RD, A0–A2) require VIH ≥ 2.4 V and VIL ≤ 0.8 V, and outputs (DB0–DB7, INT, RDY) are TTL-compatible with VOH ≥ 4.0 V at 360 µA. Interfacing to 3.3 V microcontrollers requires level-shifting buffers; the AD7828BRZ does not support mixed-voltage I/O or 3.3 V core operation.
AD7828BRZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for AD7828BRZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7828BRZ 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 reliable?
The price and inventory of AD7828BRZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7828BRZ is usually 5 days.
3.What payment methods are accepted for AD7828BRZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7828BRZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7828BRZ?
AD7828BRZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7828BRZ 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?
For technical support, including AD7828BRZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7828BRZ requirements.
6.How does Aetrix verify that AD7828BRZ is sourced from the original manufacturer or authorized distributors?
All AD7828BRZ 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 meets industry standards.
7.What is the process for return or replacement of AD7828BRZ?
All AD7828BRZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7828BRZ, 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 part is unused and in its original packaging.
Return procedure for AD7828BRZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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