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Analog Devices Inc. AD7937AR-REEL
- Part No.:
- AD7937AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7937AR-REEL.pdf
- Description:
- IC DAC 12BIT A-OUT 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,281
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Product details
Overview
AD7937AR-REEL from Analog Devices is a dual 12-bit current-output multiplying DAC in a single SOIC-24 package, featuring independent reference inputs (VREFA/VREFB), separate analog grounds (AGNDA/AGNDB), and byte-load architecture for microprocessor interfacing. It delivers ±1 LSB relative accuracy, 0.5% DAC-to-DAC ladder resistance matching, and 1 µs output settling time - enabling precision programmable gain control in synchronized analog signal paths.
For engineers reviewing the AD7937AR-REEL datasheet, AD7937AR-REEL pinout, AD7937AR-REEL application, or AD7937AR-REEL equivalent, key selection criteria include its dual-channel 4-quadrant multiplication capability, independent AGND pins for mixed-bias operation, guaranteed 12-bit monotonicity over –40°C to +85°C, and LC2MOS process compatibility with TTL/5 V CMOS logic levels.
Technical Context
The AD7937AR-REEL integrates two identical R-2R ladder-based 12-bit current-steering DACs on a monolithic die, each with dedicated reference input, feedback resistor terminal (RFBA/RFBB), and analog ground (AGNDA/AGNDB). Its double-buffered architecture supports simultaneous update of both DAC registers via the UPD signal, while asynchronous CLR enables full register reset during calibration.
Digital interface uses an 8-bit data bus (DB7–DB0) with address lines A0/A1 and control signals CS, WR, UPD, and CLR to select and load either DAC A or DAC B's LSB or MSB registers. The device operates from a single 4.5 V to 5.5 V supply and accepts right-justified 12-bit data in two-byte format - first the 8 LSBs, then the 4 MSBs - ensuring compatibility with standard 8-bit microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - guarantees 4096 discrete output current steps per DAC channel. |
| Relative Accuracy | ±1 LSB max - ensures end-point linearity error remains within 1 least-significant step across full scale. |
| DAC Matching | 0.5% ladder resistance matching - enables precise ratio-metric control between channels without external trimming. |
| Settling Time | 1 µs to 0.01% - supports high-speed waveform generation up to ~100 kHz update rates. |
| Gain Error | ±6 LSB max - defines full-scale output deviation before system-level calibration. |
| Supply Range | 4.5 V to 5.5 V - allows direct connection to standard 5 V logic rails with ±10% tolerance. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments without derating. |
Pinout & Package
AD7937AR-REEL is housed in a 24-lead Small Outline Integrated Circuit (SOIC) package (R-24), measuring 15.6 mm × 7.6 mm × 2.35 mm, with gull-wing leads and standard JEDEC MS-013 footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 24 | AGNDA / AGNDB | Independent analog ground returns - enable biasing DAC A and DAC B at different common-mode potentials (e.g., ground vs. 5 V). |
| 2, 23 | IOUTA / IOUTB | Current output nodes - require external op-amp and feedback resistor (RFBA/RFBB) to generate voltage outputs. |
| 3, 22 | RFBA / RFBB | Inverting input terminals for external op-amps - set full-scale output range via resistor value and reference voltage. |
| 4, 21 | VREFA / VREFB | Independent reference voltage inputs - support different reference sources or scaling per DAC channel. |
| 5 | CS | Chip Select - active-low enable for data loading; must be low with WR to latch data into input registers. |
| 6–11 | DB0–DB7 | 8-bit parallel data bus - carries LSB byte first, then MSB nibble (on DB3–DB0) for 12-bit code assembly. |
| 12 | DGND | Digital ground - isolated from analog grounds to minimize digital noise coupling into DAC outputs. |
| 15, 16 | A0, A1 | Address lines - decode four register addresses: DAC A LSB, DAC A MSB, DAC B LSB, DAC B MSB. |
| 17 | CLR | Asynchronous clear - forces all input and DAC registers to zero; critical for deterministic startup and calibration sequences. |
| 18 | WR | Write strobe - latches data into selected input register when CS is low; edge-triggered timing defined in datasheet. |
| 19 | UPD | Update strobe - transfers data from input registers to DAC registers; enables synchronous dual-channel updates. |
| 20 | VDD | Positive supply - powers internal logic and DAC core; operates from 4.5 V to 5.5 V with 2 mA max quiescent current. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic dual DAC | Guaranteed 12-bit monotonicity over –40°C to +85°C for both channels - eliminates inter-DAC thermal drift in closed-loop systems. |
| Separate AGND pins | AGNDA and AGNDB allow independent analog reference planes - supports mixed-mode configurations like unipolar DAC A + bipolar DAC B. |
| Byte-load architecture | 8-bit data bus with A0/A1 addressing - simplifies interface to 8-bit microcontrollers without glue logic or FIFO buffers. |
| 4-quadrant multiplication | Each DAC accepts bipolar reference inputs and generates bidirectional current outputs - enables true analog multiplication and programmable oscillator designs. |
| Low glitch impulse | 2.5 nV·s typical - minimizes transient errors during code transitions, critical for precision waveform synthesis and servo control. |
Applications
| Programmable Filter Tuning | Automatic Test Equipment (ATE) |
|---|---|
Use Scenario: Real-time adjustment of cutoff frequency and Q-factor in active filter banks using digital control. IC Role / Device Role / Timing Role: Dual DAC provides synchronized, matched gain control for integrator feedback paths in state-variable filter topologies. Use Value: 0.5% DAC matching ensures consistent pole placement across channels; 1 µs settling enables <100 kHz filter reconfiguration without phase discontinuity. | Use Scenario: Generating calibrated stimulus waveforms and precision DC bias levels for DUT characterization. IC Role / Device Role / Timing Role: AD7937AR-REEL serves as dual-channel programmable current source for voltage-controlled current sinks and reference-adjustable power supplies. Use Value: Independent VREFA/VREFB and AGNDA/AGNDB allow simultaneous sourcing of differential test signals with <1 LSB absolute accuracy over temperature. |
| Audio Signal Processing | Synchro/Resolver Emulation |
Use Scenario: Digital volume control and channel balancing in professional audio mixing consoles and broadcast equipment. IC Role / Device Role / Timing Role: Current-output DAC drives op-amp summing junctions to implement attenuation without switching transients or harmonic distortion. Use Value: Low 2.5 nV·s glitch impulse prevents audible click/pop artifacts; 12-bit resolution supports >72 dB dynamic range in analog domain. | Use Scenario: Simulating synchro or resolver rotor/stator voltages for flight control system testing and avionics HIL simulation. IC Role / Device Role / Timing Role: AD7937AR-REEL generates precise sine/cosine quadrature outputs with programmable amplitude and phase offset. Use Value: 4-quadrant multiplication mode enables direct synthesis of bipolar AC waveforms; matched DACs ensure <0.1° angular error in emulated position signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel 12-bit current-output DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7947ARZ | Single 14-bit current-output DAC; no dual-channel integration; higher resolution but no DAC-to-DAC matching spec. | Requires two devices and external synchronization for dual-channel use; lacks independent AGND pins and 4-quadrant mode. | Select when absolute 14-bit precision outweighs channel matching and board space constraints. |
| MAX532BCPP+ | Dual 12-bit voltage-output DAC; integrated output buffers; no independent reference inputs or 4-quadrant operation. | Eliminates need for external op-amps but cannot perform true multiplication; fixed 0 V to VREF output range. | Select when system requires buffered voltage outputs and simplified layout, not programmable gain or bipolar scaling. |
Compared with AD7937AR-REEL, AD7947ARZ offers higher resolution but requires duplication and external coordination for dual-channel tasks, while MAX532BCPP+ simplifies signal chain integration at the cost of flexibility in reference configuration and multiplication capability.
Availability
AD7937AR-REEL is available at Aetrix Electronics and suitable for industrial process control, automated test equipment, and programmable analog signal conditioning requiring stable component supply and long-term production continuity.
Supply support for AD7937AR-REEL 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.
The AD7937AR-REEL belongs to Analog Devices' precision DAC product line, engineered for applications demanding matched dual-channel performance, wide temperature stability, and flexible analog interface topologies in industrial and instrumentation systems.
FAQ
What is the maximum update rate supported by the AD7937AR-REEL?
The AD7937AR-REEL achieves 1 µs output current settling time to 0.01% of full scale, enabling practical update rates up to ~100 kHz for clean step responses. Minimum write pulsewidth is 115 ns at 25°C, and simultaneous dual-DAC updates via UPD occur within the same timing window. System-level throughput depends on microcontroller interface speed and register loading sequence - typically limited by the two-byte (LSB then MSB) requirement per channel.
Does the AD7937AR-REEL support true 4-quadrant multiplication?
Yes, the AD7937AR-REEL supports true 4-quadrant multiplication through its current-output architecture and independent reference inputs. When VREFA or VREFB is driven with a bipolar AC signal (e.g., ±10 V), and the DAC code is offset-binary, the output current IOUTA or IOUTB becomes proportional to the product of reference voltage and digital code - enabling analog multiplication, programmable oscillators, and synchro emulation without external multipliers.
How does the separate AGNDA and AGNDB feature benefit system design?
The separate AGNDA and AGNDB pins on the AD7937AR-REEL allow each DAC to operate with a different analog ground reference potential - for example, DAC A referenced to signal ground while DAC B is biased to +5 V. This enables mixed-mode operation such as unipolar DAC A controlling a programmable attenuator while DAC B generates a bipolar offset in a level-shifting stage, all within one IC and without crosstalk-induced errors.
What is the purpose of the CLR pin on the AD7937AR-REEL?
The CLR (Clear) pin on the AD7937AR-REEL is an asynchronous active-low input that forces all internal registers - both input and DAC registers - to zero simultaneously. This provides deterministic initialization at power-up or during calibration routines, eliminating residual code-dependent offsets and ensuring repeatable zero-output conditions before loading new data into the AD7937AR-REEL.
Can the AD7937AR-REEL be used with a 3.3 V microcontroller interface?
Yes, the AD7937AR-REEL accepts TTL, 74HC, and 5 V CMOS logic levels; its VIH minimum is 2.4 V and VIL maximum is 0.8 V, making it compatible with 3.3 V microcontrollers driving the DB0–DB7, A0, A1, CS, WR, UPD, and CLR signals directly. However, VDD must remain at 4.5 V to 5.5 V to meet internal bias requirements - level-shifting is not needed for digital control lines, but power supply must be 5 V.
AD7937AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of Bits:
- 12
- Number of D/A Converters:
- 2
- Settling Time:
- 1µs
- Output Type:
- Current - Unbuffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- INL/DNL (LSB):
- ±1 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7937AR-REEL FAQ
1.How can I place an order for AD7937AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7937AR-REEL 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 AD7937AR-REEL reliable?
The price and inventory of AD7937AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7937AR-REEL is usually 5 days.
3.What payment methods are accepted for AD7937AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7937AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7937AR-REEL?
AD7937AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7937AR-REEL 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 AD7937AR-REEL?
For technical support, including AD7937AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7937AR-REEL requirements.
6.How does Aetrix verify that AD7937AR-REEL is sourced from the original manufacturer or authorized distributors?
All AD7937AR-REEL 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 AD7937AR-REEL meets industry standards.
7.What is the process for return or replacement of AD7937AR-REEL?
All AD7937AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with AD7937AR-REEL, 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 AD7937AR-REEL part is unused and in its original packaging.
Return procedure for AD7937AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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