My Inquiry
My Account
Analog Devices Inc. AD7225BQ
- Part No.:
- AD7225BQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7225BQ.pdf
- Description:
- IC DAC 8BIT V-OUT 24CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,979
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD7225BQ from Analog Devices is a quad 8-bit voltage-output DAC with integrated output amplifiers and separate reference inputs per channel, supporting simultaneous update via LDAC, ±1 LSB differential nonlinearity (B/C versions), and operation from 11.4 V to 16.5 V dual supplies or 15 V single supply - used in programmable transversal filters and digital word multiplication circuits.
For engineers reviewing the AD7225BQ datasheet, AD7225BQ pinout, AD7225BQ application, or AD7225BQ equivalent, key selection considerations include channel-to-channel isolation (60 dB min), digital crosstalk (10 nV·sec typ), unipolar/bipolar output flexibility, and compatibility with TTL/CMOS 5 V logic interfaces.
Technical Context
The AD7225BQ implements four independent R-2R ladder DACs on a single LC2MOS die, each with dedicated reference input (VREFA–VREFD), unity-gain CMOS output buffer, and double-buffered interface logic comprising input and DAC registers per channel. Control uses A0/A1 address lines and WR/LDAC signals.
It supports both unipolar (0 V to VREF) and bipolar (±VREF/2) output configurations using external resistors; reference input range is 2 V to (VDD − 4 V); output settling time is 4 μs to ±½ LSB with 10 V reference; and analog ground (AGND) is common to all four DACs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines 256 discrete output levels per DAC channel |
| Total Unadjusted Error | ±1 LSB max (B/C versions) - ensures full-scale accuracy within 3.9 mV at 10 V reference |
| Differential Nonlinearity | ±1 LSB max - guarantees monotonic output across entire code range |
| Channel-to-Channel Isolation | 60 dB min at 10 kHz - limits signal coupling between DAC outputs under AC reference conditions |
| Output Settling Time | 4 μs max to ±½ LSB - enables high-speed waveform generation up to ~250 kHz update rate |
| Reference Input Range | 2 V to (VDD − 4 V) - allows use of AD584 (10 V), AD780 (2.5 V), or other precision references |
| Supply Voltage Range | VDD = 11.4 V to 16.5 V, VSS = −5 V ± 10% - supports dual-supply operation for improved zero-code error and sink capability |
Pinout & Package
AD7225BQ is packaged in a 24-lead PDIP (plastic dual in-line package) with standard through-hole mounting. Pin 1 identifier is a notch or dot; pins 1–12 and 13–24 are arranged linearly on opposite sides.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUTA–VOUTD | Analog voltage outputs for DAC channels A–D | Each drives 2 kΩ load to 10 V; buffered, low-impedance sources for direct connection to downstream circuitry |
| VREFA–VREFD | Independent reference voltage inputs per DAC | Enable independent scaling per channel; input resistance ≥11 kΩ, capacitance ≤50 pF |
| AGND / DGND | Analog and digital ground references | Must be separated and joined at single point to minimize noise coupling into DAC outputs |
| LDAC | Active-low load DAC control | Rising edge latches data from all four input registers to DAC registers simultaneously |
| WR, A0, A1 | Write strobe and 2-bit DAC address select | Selects one of four input registers on WR rising edge; enables microprocessor-compatible 8-bit bus interface |
| DB0–DB7 | 8-bit parallel data bus inputs | TTL/CMOS 5 V compatible; latched into selected input register on WR rising edge |
| VDD / VSS | Positive and negative power supply connections | VSS = −5 V improves sink current near AGND and reduces zero-code error drift vs. single-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| Four independent 8-bit DACs with output amplifiers | Reduces board space and interconnect complexity versus discrete DAC + op amp solutions |
| Separate reference input per DAC channel | Enables independent gain scaling for multi-signal conditioning (e.g., sensor calibration per channel) |
| Double-buffered interface with simultaneous update | Eliminates output glitches during multi-channel reconfiguration; LDAC synchronizes all four outputs |
| LC2MOS monolithic process integration | Combines high-speed digital logic and precision analog circuitry on one chip without trimming |
| Single- or dual-supply operation | Dual supply (VSS = −5 V) improves zero-code error (±20 mV max), slew rate, and sink capability near AGND |
Applications
| Programmable Transversal Filter | Digital Word Multiplication |
|---|---|
|
Use Scenario: Real-time coefficient adjustment in FIR filter implementations for communications or audio processing. IC Role / Device Role / Timing Role: Four DACs generate time-aligned analog tap weights driven by microcontroller or FPGA. Use Value: Simultaneous LDAC update ensures phase-coherent weight changes across all taps without transient distortion. |
Use Scenario: Variable-gain amplifier control where digital word determines analog multiplication factor. IC Role / Device Role / Timing Role: DAC channel A sets gain via VREF scaling; other channels provide auxiliary bias or offset control. Use Value: Independent VREFA–VREFD inputs allow dynamic gain range extension beyond fixed-reference DACs. |
| Microprocessor Interface | VSS Generation |
|
Use Scenario: Embedded system requiring multiple analog outputs controlled by 8-bit microcontroller (e.g., Z80, 8051). IC Role / Device Role / Timing Role: AD7225BQ acts as parallel-port DAC peripheral with A0/A1 address decoding and WR strobe. Use Value: Double-buffering prevents partial updates; LDAC decouples write timing from output timing for deterministic behavior. |
Use Scenario: Generating stable negative supply rail for op amps or ADC drivers in mixed-signal systems. IC Role / Device Role / Timing Role: One DAC channel (e.g., VOUTA) drives feedback network of inverting charge pump or op amp. Use Value: 8-bit resolution enables fine-grained VSS adjustment (e.g., −4.96 V to −5.04 V) to optimize analog headroom. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7224BQ | Single 8-bit DAC; no LDAC or simultaneous update; 20-pin PDIP | Lacks multi-channel coordination; suitable only for single-output systems | Choose when only one DAC channel is needed and board space is constrained |
| MAX524CPP | Quad 8-bit DAC with SPI interface; no parallel bus or LDAC; 20-pin DIP | Requires serial controller instead of parallel MPU; lacks simultaneous update synchronization | Prefer when microcontroller has limited GPIO but available SPI, and channel sync is not critical |
Compared with AD7225BQ, AD7224BQ offers lower integration and no multi-DAC coordination, while MAX524CPP trades parallel MPU compatibility and LDAC-based synchronization for serial interface simplicity and smaller footprint.
Availability
AD7225BQ is available at Aetrix Electronics and suitable for programmable filter design, digital multiplication circuits, microprocessor peripheral interfacing, and VSS generation requiring stable component supply over extended temperature ranges (−40°C to +85°C).
Supply support for AD7225BQ 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, founded in 1965 and headquartered in Wilmington, MA.
The AD7225BQ belongs to Analog Devices' precision DAC product line, designed specifically for multi-channel, microprocessor-controlled analog output systems requiring simultaneous update, independent reference scaling, and robust industrial temperature operation.
FAQ
What is the operating temperature range for the AD7225BQ?
The AD7225BQ is rated for operation from −40°C to +85°C across all versions (B, C, K, L). This industrial-grade temperature range is validated per specifications in Tables 1 and 2 of the Rev. C datasheet, with parameters such as total unadjusted error (±1 LSB max) and differential nonlinearity (±1 LSB max) guaranteed over this full range for B/C versions.
Does the AD7225BQ require external trims or calibration?
No, the AD7225BQ requires no user trims to achieve full specified performance. Its LC2MOS monolithic construction, thin-film R-2R ladder, and integrated CMOS output amplifiers ensure factory-trimmed accuracy - including ±1 LSB relative accuracy and ±20 mV zero code error - without external adjustment components.
Can the AD7225BQ operate from a single 15 V supply?
Yes, the AD7225BQ supports single-supply operation with VDD = 15 V ± 5% and VSS = AGND = DGND = 0 V. However, dual-supply operation (VSS = −5 V ± 10%) is recommended to improve zero-code error (±20 mV vs. ±30 mV), output sink capability near AGND, and negative-going settling time - all confirmed in Table 2 and the Op Amp Section of the datasheet.
How does the LDAC signal function in the AD7225BQ?
The LDAC signal in the AD7225BQ is an active-low, asynchronous control that latches data from all four input registers into their respective DAC registers on its rising edge. When LDAC is held low, DAC registers become transparent and outputs follow input latch data directly - enabling real-time updates without intermediate storage.
What is the maximum reference voltage allowed for the AD7225BQ?
The maximum reference voltage for the AD7225BQ is (VDD − 4 V), as specified in Tables 1 and 2. For example, with VDD = 15 V, VREFx must not exceed 11 V. This overhead ensures proper operation of the output amplifiers; exceeding this limit may degrade linearity or cause saturation, as detailed in the Specification Ranges section (Page 12).
AD7225BQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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, -5V
- Voltage - Supply, Digital:
- 14.25V ~ 15.75V
- INL/DNL (LSB):
- ±1 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7225BQ FAQ
1.How can I place an order for AD7225BQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7225BQ 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 AD7225BQ reliable?
The price and inventory of AD7225BQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7225BQ is usually 5 days.
3.What payment methods are accepted for AD7225BQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7225BQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7225BQ?
AD7225BQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7225BQ 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 AD7225BQ?
For technical support, including AD7225BQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7225BQ requirements.
6.How does Aetrix verify that AD7225BQ is sourced from the original manufacturer or authorized distributors?
All AD7225BQ 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 AD7225BQ meets industry standards.
7.What is the process for return or replacement of AD7225BQ?
All AD7225BQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7225BQ, 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 AD7225BQ part is unused and in its original packaging.
Return procedure for AD7225BQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD7225BQ Tags
-
MCP47A1T-A0E/LT
Microchip Technology
-
MCP4706A0T-E/CH
Microchip Technology
-
MCP4716A0T-E/MAY
Microchip Technology
-
MCP4716A0T-E/CH
Microchip Technology
-
MCP4726A0T-E/CH
Microchip Technology
-
MCP4725A0T-E/CH
Microchip Technology
-
MCP4725A1T-E/CH
Microchip Technology
-
MCP4725A2T-E/CH
Microchip Technology
-
MCP4726A1T-E/CH
Microchip Technology
-
MCP4726A3T-E/CH
Microchip Technology
-
MCP4726A2T-E/CH
Microchip Technology
-
MCP4726A0T-E/MAY
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
