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Analog Devices Inc. AD7837BQ
- Part No.:
- AD7837BQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7837BQ.pdf
- Description:
- IC DAC 12BIT V-OUT 24CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,479
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Product details
Overview
AD7837BQ from Analog Devices is a dual 12-bit multiplying DAC with integrated output amplifiers, designed for precision programmable gain control and analog panning in industrial instrumentation and audio systems. It delivers ±1/2 LSB relative accuracy, 3 µs voltage settling time to ±1/2 LSB, and –95 dB channel-to-channel isolation across –40°C to +85°C. Its dual independent DAC architecture supports simultaneous update via LDAC and operates with ±15 V supplies.
For engineers reviewing the AD7837BQ datasheet, AD7837BQ pinout, AD7837BQ application, or AD7837BQ equivalent, key selection criteria include guaranteed monotonicity, low digital feedthrough (1 nV·s), ±5 µV/°C zero-code offset drift, and Cerdip Q-24 package compatibility with MIL-STD-883B options for extended reliability.
Technical Context
The AD7837BQ implements a segmented 2-MSB + 10-bit R-2R ladder architecture per channel, with external feedback resistors (RFBA/RFBB) enabling precise gain programming. Each DAC features independent reference inputs (VREFA/VREFB) supporting ac/dc signals up to ±10 V swing into 2 kΩ loads.
Its microprocessor interface uses an 8-bit data bus with address-controlled input latches (A0/A1), CS/WR control, and asynchronous LDAC for synchronized dual-output updates. Timing tolerances include 0 ns CS-to-WR setup/hold and 40 ns minimum LDAC pulsewidth - optimized for 8051, 6502, and 6809 systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12 bits - supports 4096 discrete output levels per channel with monotonic transfer function. |
| Relative Accuracy | ±1/2 LSB max - ensures high-fidelity signal reconstruction critical for closed-loop control calibration. |
| Settling Time | 3 µs typ to ±1/2 LSB - enables fast waveform generation and real-time gain adjustment in servo systems. |
| Channel Isolation | –95 dB typ (VREFA→VOUTB) - prevents crosstalk-induced distortion in stereo panning or dual-channel monitoring. |
| Power Supply Range | ±14.25 V to ±15.75 V - compatible with standard ±15 V industrial rails; functional down to ±12 V per typical graphs. |
| Digital Feedthrough | 1 nV·s typ - minimizes transient injection during data writes, preserving signal integrity in sensitive analog paths. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating or thermal management overhead. |
Pinout & Package
AD7837BQ is housed in a 24-lead Cerdip (Q-24) package with hermetic ceramic construction, lead finish per MIL-M-38510, and pin 1 identified by dot or notch. The package supports surface-mount and through-hole assembly with 0.300" wide body and 0.125" minimum lead length.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CS | Active-low chip select - enables parallel bus access; must be low with WR to load data into input latches. |
| 2 | RFBA | Feedback resistor terminal for DAC A - sets gain scale factor and full-scale output range (VOUTA = –D × VREFA). |
| 3 | VREFA | Reference input for DAC A - accepts ac or dc signals; determines polarity and amplitude of analog output. |
| 4 | VOUTA | Analog output of DAC A - provides buffered, rail-to-rail capable voltage output with 0.2 Ω DC impedance. |
| 5 | AGNDA | Analog ground for DAC A - must be tied locally to DGND at device pin to minimize ground bounce and noise coupling. |
| 6 | VDD | +15 V supply - powers internal logic and output amplifiers; requires 10 µF + 0.1 µF decoupling to DGND. |
| 7 | VSS | –15 V supply - completes dual-supply operation; Schottky diode recommended if open-circuit risk exists. |
| 8 | AGNDB | Analog ground for DAC B - isolated from AGNDA but must share common reference point with DGND. |
| 9 | VOUTB | Analog output of DAC B - independently controllable; identical specs to VOUTA including slew rate (11 V/µs). |
| 10 | VREFB | Reference input for DAC B - enables independent scaling or phase-coherent dual-channel modulation. |
| 11 | DGND | Digital ground - reference for all logic inputs; interconnection with AGNDA/AGNDB at single point reduces EMI. |
| 12 | RFBB | Feedback resistor terminal for DAC B - allows separate gain configuration for second channel in PGA designs. |
| 13 | WR | Write strobe - active-low edge-sensitive signal controlling latch loading; timing-critical for 8-bit bus interfacing. |
| 14 | LDAC | Load DAC - asynchronous low-active signal transferring data from input latches to DAC latches simultaneously. |
| 15–16 | A1/A0 | Address inputs - select among four 8-bit input latches (DAC A/B, MS/LS) during 8-bit bus transfers. |
| 17–24 | DB7–DB0 | Data bus - 8-bit bidirectional interface accepting right-justified 12-bit words in two sequential writes. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 12-bit DACs | Enables true stereo panning or dual-loop control without shared timing constraints or resource contention. |
| Guaranteed monotonicity | Ensures no output glitches or reversals during code transitions - essential for closed-loop stability in servo systems. |
| External RFB configuration | Permits precise gain calibration and wide dynamic range (e.g., 0.1× to 100×) in programmable gain amplifier circuits. |
| Low digital crosstalk (1 nV·s) | Maintains signal purity when updating one DAC while the other remains static - critical for mixed-signal test equipment. |
| Asynchronous LDAC control | Allows synchronized multi-device updates across distributed systems without requiring matched clock trees or timing alignment. |
Applications
| Programmable Gain Amplifier (PGA) | Analog Audio Panning |
|---|---|
Use Scenario: Digitally adjusting signal gain in industrial sensor conditioning front-ends where input ranges vary across multiple transducers. IC Role / Device Role / Timing Role: Dual DAC functions as digitally controlled feedback resistors in op-amp loops, enabling 12-bit resolution gain steps with simultaneous update. Use Value: Achieves >80 dB dynamic range with <0.01% gain error drift over temperature using matched external resistors and ±1/2 LSB linearity. |
Use Scenario: Distributing mono audio source across left/right channels while maintaining constant total power in broadcast mixing consoles. IC Role / Device Role / Timing Role: DAC A and DAC B generate complementary analog outputs driven by two's complement codes, enabling smooth pan position control. Use Value: Delivers ≤0.5 dB total power variation across full pan range using external AD712 op-amps and precision resistor networks. |
| Bipolar 4-Quadrant Multiplication | Calibration Reference Generator |
Use Scenario: Modulating RF carrier signals in communications test equipment requiring precise amplitude and phase control. IC Role / Device Role / Timing Role: Operates in offset binary mode with bipolar references to produce symmetrical ±VOUT swing around 0 V. Use Value: Supports 4-quadrant multiplication with –90 dB multiplying feedthrough error at 10 kHz, minimizing harmonic distortion. |
Use Scenario: Generating traceable, stable DC reference voltages for automated test systems calibrating multimeters and DAQ modules. IC Role / Device Role / Timing Role: Provides low-drift, high-linearity analog outputs referenced to precision external VREF sources (e.g., LTZ1000). Use Value: Delivers ±4 mV zero-code offset error over full temperature range and ±2 ppm/°C gain drift for metrology-grade accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7847BQ | Separate CSA/CSB pins, rising-edge WR, internal RFB - eliminates external resistors but removes gain flexibility. | Better suited for memory-mapped 16-bit microprocessor interfaces (e.g., 8086, MC68000); less optimal for 8-bit bus systems. | Select AD7847BQ when simplifying layout with internal feedback and direct 12-bit parallel writes are prioritized over programmable gain. |
| AD5724RBRUZ | Quad 12-bit DAC, SPI interface, on-chip reference, 24-lead TSSOP - lacks bipolar operation and external RFB configurability. | Targets space-constrained, low-power embedded systems; not suitable for high-voltage ±15 V analog signal chains. | Choose AD5724RBRUZ for SPI-based designs needing quad-channel density and integrated reference, not for ±15 V industrial PGA use. |
Compared with AD7847BQ and AD5724RBRUZ, the AD7837BQ uniquely balances 8-bit bus compatibility, external gain control via RFBA/RFBB, and hermetic Cerdip packaging - making it the only option supporting simultaneous LDAC-triggered updates in legacy microcontroller systems with strict analog performance requirements.
Availability
AD7837BQ is available at Aetrix Electronics and suitable for industrial instrumentation, audio panning circuits, programmable gain amplifiers, and calibration reference generators requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7837BQ 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 AD7837BQ belongs to Analog Devices' precision DAC product line, engineered specifically for industrial control, test & measurement, and professional audio applications demanding low glitch energy, high channel isolation, and robust dual-supply operation.
FAQ
What is the maximum operating voltage for AD7837BQ?
The AD7837BQ operates with VDD between +14.25 V and +15.75 V, and VSS between –14.25 V and –15.75 V under specified conditions. Absolute maximum ratings allow VDD to +17 V and VSS to –17 V, but sustained operation outside the ±15 V ±5% range may degrade linearity and increase offset drift. The AD7837BQ remains functional down to ±12 V per typical performance graphs, though output headroom decreases accordingly.
How does the LDAC pin function in AD7837BQ?
The LDAC pin on the AD7837BQ is an asynchronous, active-low control that transfers data from the input latches to the DAC latches simultaneously for both channels. When LDAC goes low, both VOUTA and VOUTB update in unison - critical for synchronized waveform generation or multi-axis control. The AD7837BQ requires LDAC to remain low for ≥40 ns after CS or WR return high to prevent invalid latching during overlapping operations.
Can AD7837BQ operate with unipolar reference inputs?
Yes, the AD7837BQ supports unipolar binary operation using VREFA or VREFB as positive-only references (e.g., 0 V to +10 V), producing negative output voltages from 0 V to –VREF × (4095/4096). The AD7837BQ maintains its ±1/2 LSB relative accuracy and monotonicity in this mode, provided the output amplifier load remains within its ±10 V capability and power supply headroom (≥3 V) is preserved.
What is the purpose of RFBA and RFBB pins on AD7837BQ?
RFBA and RFBB are external feedback resistor terminals for DAC A and DAC B respectively, enabling programmable gain configuration in op-amp-based circuits. Connecting these pins to the output amplifier's inverting input forms a current-to-voltage converter where VOUT = –D × VREF. The AD7837BQ relies on externally selected resistors to set full-scale range and gain accuracy - a key differentiator from internally compensated alternatives like AD7847BQ.
Is AD7837BQ suitable for bipolar (4-quadrant) multiplication?
Yes, the AD7837BQ supports bipolar operation using offset binary coding, delivering true 4-quadrant multiplication when VREFA and VREFB accept ac-coupled signals. With proper resistor matching (≤0.01%), the AD7837BQ achieves –90 dB multiplying feedthrough error at 10 kHz and maintains ±1/2 LSB linearity - validated in Figure 16 and Table IV of the official datasheet revision C.
AD7837BQ 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:
- 12
- Number of D/A Converters:
- 2
- Settling Time:
- 5µs
- Output Type:
- Voltage - Buffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- ±14.25V ~ 15.75V
- Voltage - Supply, Digital:
- -
- INL/DNL (LSB):
- ±0.5 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7837BQ FAQ
1.How can I place an order for AD7837BQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7837BQ 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 AD7837BQ reliable?
The price and inventory of AD7837BQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7837BQ is usually 5 days.
3.What payment methods are accepted for AD7837BQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7837BQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7837BQ?
AD7837BQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7837BQ 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 AD7837BQ?
For technical support, including AD7837BQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7837BQ requirements.
6.How does Aetrix verify that AD7837BQ is sourced from the original manufacturer or authorized distributors?
All AD7837BQ 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 AD7837BQ meets industry standards.
7.What is the process for return or replacement of AD7837BQ?
All AD7837BQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7837BQ, 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 AD7837BQ part is unused and in its original packaging.
Return procedure for AD7837BQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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