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Analog Devices Inc. AD7226BE
- Part No.:
- AD7226BE
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-CLCC
- Datasheet:
-
AD7226BE.pdf
- Description:
- IC DAC 8BIT V-OUT 20LCCC
- Quantity:
- Payment:
- Shipping:
Inventory:154
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Product details
Overview
AD7226BE from Analog Devices is a quad 8-bit voltage-output digital-to-analog converter with integrated output buffer amplifiers and microprocessor-compatible interface logic in a single LC2MOS monolithic IC. It delivers ±1 LSB total unadjusted error (dual supply), 4 ms settling time to ±1/2 LSB, and supports reference voltages from 2 V to 12.5 V - used in automatic test equipment for synchronized multi-channel analog stimulus generation.
For engineers reviewing the AD7226BE datasheet, AD7226BE pinout, AD7226BE application, or AD7226BE equivalent, key selection considerations include DAC-to-DAC matching performance, single/dual supply flexibility, TTL/CMOS-compatible 8-bit bus interface with A0/A1 address decoding, and on-chip laser-trimmed amplifier offsets eliminating external nulling.
Technical Context
The AD7226BE integrates four identical R-2R ladder-based voltage-mode DACs sharing a common VREF and AGND, each with a unity-gain noninverting CMOS buffer capable of 5 mA output drive and 3300 pF capacitive load tolerance. Its LC2MOS process enables co-integration of precision analog and high-speed digital logic.
Control logic uses level-triggered WR with A0/A1 addressing to select one of four latches transparent during WR low; data is latched on WR rising edge. Digital crosstalk is specified at 10 nV·s, and full-scale output follows VOUTX = DX × VREF where DX is fractional code (0 to 255/256).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines 256 discrete output voltage steps per channel |
| Total Unadjusted Error | ±1 LSB max (dual supply) - includes zero code, full-scale, and linearity errors without calibration |
| Settling Time | 4 ms max to ±1/2 LSB - determines minimum update rate for stable analog output transitions |
| Reference Range | 2 V to (VDD – 4 V) - enables use with standard references like AD584 (10 V) or AD780 (2.5 V) |
| Digital Inputs | TTL/CMOS-compatible - operates with 5 V logic families across full VDD range (11.4–16.5 V) |
| Output Drive | 5 mA per channel - sufficient to directly drive 2 kΩ loads or low-impedance instrumentation inputs |
| Temperature Range | –40°C to +85°C - qualified for industrial and commercial embedded systems |
Pinout & Package
AD7226BE is available in a 20-lead plastic DIP (N-20) package with 0.3-inch body width, pin 1 index notch, and standard through-hole mounting. Pin layout separates analog (VREF, AGND, VOUTA–D, VSS) and digital (DB0–DB7, A0, A1, WR, DGND, VDD) sections to minimize noise coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 4) | Reference voltage input | Common analog reference for all four DACs; sets full-scale output range and polarity |
| AGND (Pin 5) | Analog ground | Return path for reference and analog outputs; must be tied to DGND at device for noise control |
| DGND (Pin 6) | Digital ground | Return for digital inputs; separation from AGND reduces digital switching noise injection |
| DB7–DB0 (Pins 7–14) | 8-bit parallel data bus | MSB-to-LSB input port shared by all DACs; TTL/CMOS compatible at VDD = 11.4–16.5 V |
| A0, A1 (Pins 15–16) | DAC address select | Binary-encoded selection of DAC A–D; latching occurs on WR rising edge |
| WR (Pin 17) | Write strobe | Level-sensitive control: latch transparent when low, data captured on rising edge |
| VSS (Pin 18) | Negative supply | –5 V ±10% required for dual-supply operation; improves sink capability near AGND |
| VOUTA–VOUTD (Pins 19–20, 1–2) | Analog outputs | Buffered voltage outputs; each drives up to 5 mA into resistive or 3300 pF capacitive loads |
| VDD (Pin 3) | Positive supply | +11.4 V to +16.5 V (dual) or +14.25 V to +15.75 V (single); powers digital and analog sections |
Key Features
| Feature | Design Value |
|---|---|
| DAC-to-DAC matching | Inherent tracking due to monolithic integration - critical for multi-channel synchronization in ATE |
| Single-supply operation | Functional with VDD = +15 V and VSS = AGND - simplifies power design in portable or cost-sensitive systems |
| Microprocessor compatibility | Level-triggered latches with A0/A1 addressing - interfaces directly to 8085A, 6809, 6502, and Z-80 buses without glue logic |
| No user trims required | Laser-trimmed amplifier offsets and matched R-2R ladders - eliminates manual calibration in production |
| Small footprint integration | Four DACs + four op amps + interface logic in 20-pin DIP - reduces board area vs. discrete solutions by >70% |
Applications
| Process Control | Automatic Test Equipment |
|---|---|
Use Scenario: Programmable setpoint generation for temperature, pressure, and flow controllers in PLC-based industrial systems. IC Role / Device Role / Timing Role: Quad voltage source providing independent analog command signals to four PID loop actuators. Use Value: Matched DAC performance ensures consistent loop response across channels; laser-trimmed offsets eliminate drift-induced calibration drift over temperature. | Use Scenario: Stimulus generation for functional testing of analog circuits, including op amp gain/offset verification and ADC linearity sweeps. IC Role / Device Role / Timing Role: Synchronized multi-channel analog waveform generator controlled via microprocessor address/data bus. Use Value: 4 ms settling time and ±1 LSB accuracy enable precise DC and low-frequency AC stimulus; digital crosstalk <10 nV·s prevents inter-channel interference. |
| Automatic Calibration | 3-Phase Motor Control |
Use Scenario: Real-time gain and offset correction of sensor signal chains in medical instrumentation and data acquisition systems. IC Role / Device Role / Timing Role: Precision programmable bias generator trimming front-end amplifier offsets and scaling factors. Use Value: On-chip buffer amplifiers deliver stable 5 mA drive into calibration potentiometers or op amp summing nodes without external buffering. | Use Scenario: Generation of three synchronized 120° phase-shifted sine waves for open-loop control of small brushless DC motors. IC Role / Device Role / Timing Role: Multi-channel waveform synthesizer using EPROM lookup tables and software-controlled DAC updates. Use Value: Monolithic DAC matching ensures consistent amplitude and phase alignment across VOUTA–C; 256-step resolution yields 1.4° electrical angle granularity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad 8-bit DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7225KN | Quad 8-bit DAC without output buffers; requires external op amps for voltage drive | Suitable only where external amplification is acceptable and board space allows discrete buffers | Select AD7225KN only if lower quiescent current (8 mA vs. 24 mA) outweighs added design complexity and component count |
| MAX524CPP | Quad 8-bit DAC with rail-to-rail output buffers; 2.7–5.5 V single-supply operation only | Designed for low-voltage embedded systems; lacks dual-supply flexibility and ±1 LSB accuracy guarantee | Choose MAX524CPP for battery-powered or 3.3 V microcontroller systems where extended reference range and industrial temp grade are not required |
Compared with AD7226BE, AD7225KN demands external amplification and increases BOM count, while MAX524CPP restricts supply voltage and reference flexibility - making AD7226BE the optimal choice for industrial ATE and process control requiring guaranteed ±1 LSB accuracy, wide VREF support, and integrated buffering.
Availability
AD7226BE is available at Aetrix Electronics and suitable for automatic test equipment, process control systems, and automatic calibration applications requiring stable component supply, long-term lifecycle continuity, and traceable sourcing.
Supply support for AD7226BE 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.
The AD7226BE belongs to Analog Devices' precision DAC product line, engineered for applications demanding multi-channel synchronization, low-drift performance, and seamless microprocessor interfacing in industrial instrumentation and automated test systems.
FAQ
What is the maximum reference voltage supported by the AD7226BE?
The AD7226BE supports a reference voltage range of 2 V to (VDD – 4 V). With VDD = +15 V, the maximum VREF is +11 V; with VDD = +16.5 V, it is +12.5 V. This allows compatibility with standard references such as the AD584 (10 V) and AD780 (2.5 V), and ensures proper bias generation for internal DAC switches.
Does the AD7226BE require external trimming components for full accuracy?
No, the AD7226BE does not require external trimming components. Its output buffer amplifier offsets are laser-trimmed during manufacture, and the R-2R ladder network is inherently matched. Full specified performance - including ±1 LSB total unadjusted error and ±0.5 LSB relative accuracy - is achieved without user adjustments or external nulling circuitry.
Can the AD7226BE operate from a single +15 V supply?
Yes, the AD7226BE supports single-supply operation with VDD = +15 V ±5% and VSS = AGND = 0 V. In this mode, total unadjusted error is ±2 LSB max, and slew rate is reduced to 2 V/μs (vs. 2.5 V/μs dual supply). Output sink capability near AGND is diminished, so dual supply (VSS = –5 V) is recommended for full performance.
How is DAC selection implemented on the AD7226BE?
DAC selection on the AD7226BE is controlled by address lines A0 and A1, combined with the WR strobe. When WR is low, the selected DAC latch (A–D) becomes transparent to the DB7–DB0 bus. Data is latched into the addressed DAC on the rising edge of WR. The truth table in the AD7226BE datasheet defines exact A0/A1/WR combinations for each DAC.
What is the purpose of the VSS pin on the AD7226BE?
The VSS pin on the AD7226BE serves as the negative supply for the output buffer amplifiers. At –5 V ±10%, it enables full 400 μA sink capability down to AGND, improves zero-code error, enhances negative-going settling time, and maintains amplifier linearity. Omitting VSS (i.e., tying VSS to AGND) degrades sink performance near 0 V but permits single-supply operation.
AD7226BE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CLCC
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 4
- Settling Time:
- 4µs
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 11.4V ~ 16.5V
- INL/DNL (LSB):
- ±0.5 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-LCCC (9x9)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7226BE FAQ
1.How can I place an order for AD7226BE through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7226BE 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 AD7226BE reliable?
The price and inventory of AD7226BE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7226BE is usually 5 days.
3.What payment methods are accepted for AD7226BE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7226BE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7226BE?
AD7226BE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7226BE 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 AD7226BE?
For technical support, including AD7226BE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7226BE requirements.
6.How does Aetrix verify that AD7226BE is sourced from the original manufacturer or authorized distributors?
All AD7226BE 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 AD7226BE meets industry standards.
7.What is the process for return or replacement of AD7226BE?
All AD7226BE units undergo pre-shipment inspection (PSI). If there is an issue with AD7226BE, 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 AD7226BE part is unused and in its original packaging.
Return procedure for AD7226BE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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