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Analog Devices Inc. AD7628KR
- Part No.:
- AD7628KR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7628KR.pdf
- Description:
- IC DAC 8BIT A-OUT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,492
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Product details
Overview
AD7628KR from Analog Devices is a monolithic dual 8-bit buffered multiplying DAC with separate on-chip latches for each channel, operating from +12 V to +15 V, delivering ±1/2 LSB relative accuracy and ±1 LSB differential nonlinearity across –40°C to +85°C, used in programmable filters and X-Y graphics systems.
For engineers reviewing the AD7628KR datasheet, AD7628KR pinout, AD7628KR application, or AD7628KR equivalent, key selection criteria include DAC-to-DAC matching (1%), four-quadrant multiplication capability, TTL/CMOS compatibility at +12 V to +15 V, and SOIC-20 package suitability for space-constrained analog control designs.
Technical Context
The AD7628KR integrates two identical 8-bit R-2R ladder DACs with current-steering switches, each featuring independent reference inputs (VREFA/VREFB) and feedback resistors (RFB A/RFB B), enabling true four-quadrant multiplication and unipolar/bipolar output configurations via offset binary coding.
Its digital interface uses a shared 8-bit TTL/CMOS-compatible bus (DB0–DB7) with dedicated DAC A/DAC B select, chip select (CS), and write (WR) controls - supporting microprocessor bus timing compatible with 6502, 6809, 8085, and Z80 architectures without external latches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines 256 discrete output levels per DAC channel |
| Relative Accuracy | ±1/2 LSB max - ensures endpoint linearity within 0.2% of full scale after zero/full-scale adjustment |
| Differential Nonlinearity | ±1 LSB max - guarantees monotonic operation over full temperature range |
| DAC Matching | 1% gain match - enables precise ratio-metric control in dual-channel applications like stereo attenuators |
| Supply Voltage Range | +12 V to +15 V - supports direct integration with legacy industrial logic rails |
| Power Dissipation | 20 mW typical - minimizes thermal load in dense mixed-signal PCB layouts |
| Settling Time | 350 ns to 1/2 LSB - enables high-speed waveform generation up to ~1 MHz update rate |
Pinout & Package
AD7628KR is housed in a 20-pin SOIC (Small Outline Integrated Circuit) package with gull-wing leads, 0.3-inch body width, and standard JEDEC MS-013 footprint. Pin 1 is AGND, pin 2 is OUT A, pin 20 is OUT B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (AGND) | Analog Ground | Common return for analog outputs and reference inputs; must be tied to DGND at device for noise control |
| 2 (OUT A) | Analog Output A | Current-output node for DAC A; requires external op amp for voltage output or impedance matching |
| 3 (OUT B) | Analog Output B | Current-output node for DAC B; electrically isolated from OUT A with –80 dB channel-to-channel isolation |
| 4 (RFB B) | Feedback Resistor B | Connection point for external RFB resistor to set DAC B gain; enables independent scaling |
| 5 (DGND) | Digital Ground | Return for digital inputs; separation from AGND reduces digital switching noise coupling |
| 6 (DAC A/DAC B) | DAC Selection Control | Active-low signal selecting which DAC latch accepts data from DB0–DB7 bus |
| 7–14 (DB7–DB0) | Digital Data Bus | 8-bit parallel input port shared by both DACs; MSB (DB7) to LSB (DB0) ordering |
| 15 (WR) | Write Strobe | Active-low control initiating latch update when CS is low; defines write pulse width (≥150 ns) |
| 16 (CS) | Chip Select | Active-low enable for interface; combined with WR determines operating mode per Mode Selection Table |
| 17 (RFB A) | Feedback Resistor A | Connection point for external RFB resistor to set DAC A gain; matched to RFB B for ratio accuracy |
| 18 (VREF A) | Reference Input A | High-impedance (8–15 kΩ) reference voltage source for DAC A; supports ±25 V input range |
| 19 (VREF B) | Reference Input B | Independent high-impedance reference for DAC B; matched to VREF A within ±1% for tracking |
| 20 (VDD) | Positive Supply | +12 V to +15 V analog/digital supply; powers internal latches and R-2R ladder |
Key Features
| Feature | Design Value |
|---|---|
| On-chip dual latches | Enables independent, asynchronous loading of DAC A and DAC B without bus contention or external registers |
| Four-quadrant multiplication | Supports bipolar output swing using external op amp feedback; enables programmable gain/attenuation with sign control |
| DAC-to-DAC matching | 1% gain match and ±1% VREF input resistance match ensure consistent scaling between channels in filter or attenuator designs |
| TTL/CMOS compatibility | Operates with standard logic thresholds (VIH ≥ 2.4 V, VIL ≤ 0.8 V) across full +12 V to +15 V supply range |
| Low-glitch impulse | 330 nV·s typical glitch energy minimizes transient errors during code transitions in precision waveform synthesis |
Applications
| Programmable Filters | X-Y Graphics |
|---|---|
Use Scenario: Digitally adjustable low-pass/high-pass filter coefficients in audio or instrumentation systems. IC Role / Device Role / Timing Role: Dual DAC provides real-time control of integrator time constants and feedback gains in state-variable filter topologies. Use Value: Enables microprocessor-controlled cutoff frequency (0–15 kHz) and Q factor (0.3–4.5) with matched DAC A/B tracking preserving filter symmetry. |
Use Scenario: Precision coordinate-driven deflection in vector displays or laser scanning systems. IC Role / Device Role / Timing Role: DAC A drives X-axis amplifier, DAC B drives Y-axis amplifier; synchronized updates generate stable raster or vector patterns. Use Value: 8-bit resolution (256×256 grid) and <350 ns settling support >1 MHz update rates for smooth trajectory rendering. |
| Disk Drive Servo Control | Digitally Controlled Attenuation |
Use Scenario: Closed-loop head positioning using analog error amplifiers and voice coil drivers. IC Role / Device Role / Timing Role: DAC A sets position reference, DAC B generates correction bias; differential output improves common-mode rejection. Use Value: ±1/2 LSB linearity and 1% DAC matching reduce positional quantization error and improve track-following accuracy. |
Use Scenario: Stereo audio or telephone line level adjustment with independent left/right channel control. IC Role / Device Role / Timing Role: Each DAC functions as a digitally programmable current-controlled attenuator using R-2R ladder termination. Use Value: 0–15.5 dB attenuation range with 0.5 dB steps; matched channels ensure consistent stereo balance across full code range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 8-bit multiplying DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7626KRZ | Single 8-bit DAC, no dual-channel or DAC-to-DAC matching spec | Lacks simultaneous dual-output capability; unsuitable for ratio-metric or differential applications | Select only if single-channel operation suffices and board space allows SOIC-16 footprint |
| MAX521ACPP+ | Quad 8-bit DAC with I²C interface; no native parallel bus or four-quadrant multiplication | Requires serial protocol overhead; lacks independent reference inputs per channel | Prefer for low-pin-count systems where microcontroller I²C is available and analog flexibility is secondary |
Compared with AD7628KR, AD7626KRZ offers lower cost and smaller package but forfeits dual-channel matching and independent reference support, while MAX521ACPP+ adds channel count and serial control at the expense of parallel interface speed and four-quadrant analog flexibility.
Availability
AD7628KR is available at Aetrix Electronics and suitable for programmable filters, X-Y graphics systems, and disk drive servo control requiring stable component supply with guaranteed long-term sourcing.
Supply support for AD7628KR 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 AD7628KR belongs to Analog Devices' precision DAC product line, designed specifically for applications demanding matched dual-channel conversion, four-quadrant multiplication, and microprocessor-bus compatibility in industrial and instrumentation systems.
FAQ
What is the operating temperature range for the AD7628KR?
The AD7628KR is rated for operation from –40°C to +85°C (K-grade). This commercial/industrial temperature range is validated per the AD7628 datasheet Rev. A, with all static and dynamic specifications guaranteed across this span, including ±1/2 LSB relative accuracy and ±1 LSB differential nonlinearity.
Does the AD7628KR support true four-quadrant multiplication?
Yes, the AD7628KR supports true four-quadrant multiplication via independent VREFA/VREFB inputs and separate RFB A/RFB B terminals. Each DAC can accept bipolar reference voltages up to ±25 V, enabling output polarity reversal and gain control in both positive and negative quadrants - confirmed in Figures 4 and 5 of the AD7628 datasheet.
What package type is used for the AD7628KR?
The AD7628KR uses a 20-pin SOIC (Small Outline Integrated Circuit) package, identified by the "R" suffix in the ordering guide. Its dimensions conform to JEDEC MS-013, with 0.3-inch body width and gull-wing leads - distinct from the N-20 (DIP), P-20A (PLCC), or Q-20 (Cerdip) variants.
Can the AD7628KR interface directly with an 8085 microprocessor?
Yes, the AD7628KR is explicitly bus-compatible with the 8085 microprocessor. Its write-cycle timing (tCS ≥ 160 ns, tWR ≥ 150 ns) aligns with 8085 minimum strobe requirements, and its CS/WR/DAC A-DAC B control scheme matches standard 8085 I/O mapping - demonstrated in Figure 12 of the AD7628 datasheet.
What is the maximum allowable reference voltage for the AD7628KR?
The AD7628KR supports reference input voltages up to ±25 V on VREFA and VREFB pins, as specified in the Absolute Maximum Ratings table. This wide range enables high-voltage gain control and direct interfacing with industrial sensors or actuator drivers without level-shifting circuitry.
AD7628KR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 2
- Settling Time:
- 400ns
- Output Type:
- Current - Unbuffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 10.8V ~ 15.75V
- Voltage - Supply, Digital:
- 10.8V ~ 15.75V
- INL/DNL (LSB):
- ±0.5 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 20-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7628KR FAQ
1.How can I place an order for AD7628KR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7628KR 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 AD7628KR reliable?
The price and inventory of AD7628KR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7628KR is usually 5 days.
3.What payment methods are accepted for AD7628KR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7628KR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7628KR?
AD7628KR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7628KR 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 AD7628KR?
For technical support, including AD7628KR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7628KR requirements.
6.How does Aetrix verify that AD7628KR is sourced from the original manufacturer or authorized distributors?
All AD7628KR 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 AD7628KR meets industry standards.
7.What is the process for return or replacement of AD7628KR?
All AD7628KR units undergo pre-shipment inspection (PSI). If there is an issue with AD7628KR, 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 AD7628KR part is unused and in its original packaging.
Return procedure for AD7628KR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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