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Analog Devices Inc. AD7569BQ
- Part No.:
- AD7569BQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 24-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7569BQ.pdf
- Description:
- IC INTERFACE SPECIALIZED 24CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,453
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Product details
Overview
AD7569BQ from Analog Devices is a complete, single-DAC 8-bit analog I/O system IC integrating a 2 µs successive-approximation ADC with track/hold, an 8-bit DAC with 1 µs settling output amplifier, on-chip 1.25 V bandgap reference, and fast 8-bit parallel bus interface. It operates from single +5 V or dual ±5 V supplies and supports programmable unipolar (0 to +1.25 V / 0 to +2.5 V) or bipolar (±1.25 V / ±2.5 V) ranges via RANGE/VSS pins. Used in industrial data acquisition and embedded control systems requiring self-contained analog interfacing.
For engineers reviewing the AD7569BQ datasheet, AD7569BQ pinout, AD7569BQ application, or AD7569BQ equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and two confirmed alternative parts - all grounded in the official REV. B datasheet and Analog Devices' product documentation.
Technical Context
The AD7569BQ implements a mixed-signal LC2MOS architecture combining precision bipolar circuitry for analog blocks (DAC ladder, track/hold, reference) with low-power CMOS logic for digital control and interface. Its ADC uses internal successive approximation register (SAR) logic synchronized by either internal RC clock or external 5 MHz TTL/CMOS clock, achieving 2 µs max conversion time.
The DAC employs eight PNP current sources switched into an R-2R thin-film resistor ladder, referenced to the on-chip bandgap, driving a high-speed noninverting op amp with gain/offset network. Output voltage range selection (unipolar/bipolar, 1.25 V/2.5 V) is determined jointly by RANGE pin state and VSS supply configuration - and applies identically to both DAC output and ADC input ranges.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines quantization step size: 4.88 mV (0–1.25 V), 9.76 mV (0–2.5 V or ±1.25 V), or 19.5 mV (±2.5 V) |
| ADC Conversion Time | 2 µs max - enables sampling rates up to 400 kHz with precise timing control via ST or RD signals |
| DAC Settling Time | 2 µs max (positive full-scale change) - ensures stable analog output within 1/2 LSB for real-time control loops |
| Total Unadjusted Error (DAC) | ±2 LSB max (B grade, –40°C to +85°C) - includes reference, offset, gain, and linearity errors without calibration |
| Signal-to-Noise Ratio (ADC) | 46 dB min at 100 kHz input - supports medium-fidelity signal digitization in noise-sensitive applications |
| Supply Range | +4.75 V to +5.25 V (VDD); 0 V or –4.75 V to –5.25 V (VSS) - enables flexible unipolar or bipolar analog operation |
| Logic Compatibility | TTL/5 V CMOS - interfaces directly with 8051, Z80, and other legacy microprocessors without level-shifting |
Pinout & Package
AD7569BQ is packaged in a 24-terminal CERDIP (Q-24) package - hermetically sealed ceramic dual in-line with 0.3" width, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AGNDDAC | Analog ground for DAC section | Separate return path minimizes digital switching noise coupling into DAC output |
| VOUT | Buffered DAC analog output | Delivers programmable voltage ranges (0–1.25 V, 0–2.5 V, ±1.25 V, ±2.5 V) with 2 kΩ/100 pF drive capability |
| VSS | Negative supply / range mode selector | 0 V enables unipolar operation and binary coding; –5 V enables bipolar operation and 2's complement coding |
| RANGE | Input/output range select control | Combines with VSS to configure full-scale range: logic 0/1 selects 1.25 V or 2.5 V magnitude for both DAC and ADC |
| RESET | Asynchronous active-low reset | Clears DAC register to 0x00 (0 V unipolar, –FS bipolar) and deasserts INT; used for system initialization |
| DB0–DB7 | 8-bit bidirectional data bus | Transfers DAC write data or ADC conversion results; direction controlled by CS/WR/RD timing |
| DGND | Digital ground reference | Isolated from AGNDDAC and AGNDADC to prevent digital noise from modulating analog performance |
| WR | Edge-triggered write strobe | Rising edge latches DB0–DB7 into DAC register; requires t1 ≥ 80 ns pulse width (B grade) |
| CS | Active-low chip select | Enables device for read/write access; must be asserted before WR or RD to avoid bus contention |
| RD | Active-low read strobe | Falling edge initiates ADC conversion in Mode 2; rising edge reads completed result from DB0–DB7 |
| ST | Start conversion trigger | Falling edge initiates ADC sampling and drives BUSY low; independent of CS for precise timing control |
| BUSY | Active-low conversion status | Indicates ongoing ADC conversion; transitions low at ST fall, high after conversion completes and INT asserts |
| INT | Active-low interrupt output | Signals ADC conversion completion; cleared by rising edge of CS or RD, or RESET pulse |
| CLK | External clock input | Accepts 5 MHz TTL/CMOS clock for deterministic conversion timing; internal RC clock also supported |
| AGNDADC | Analog ground for ADC section | Independent ground node prevents DAC switching transients from corrupting ADC sampling accuracy |
| VIN | ADC analog input | Accepts same programmable ranges as VOUT (0–1.25 V, 0–2.5 V, ±1.25 V, ±2.5 V) with 200 kHz track/hold bandwidth |
| VDD | Positive supply voltage | +5 V ±5% main power rail; powers all analog and digital sections; internal bandgap reference derived from VDD |
Key Features
| Feature | Design Value |
|---|---|
| On-chip 1.25 V bandgap reference | Provides matched, temperature-compensated reference for both ADC and DAC - eliminates external reference component and matching error |
| Programmable analog ranges | Single control (RANGE + VSS) configures identical input/output voltage spans for both ADC and DAC - simplifies system-level range management |
| Fast 8-bit parallel bus interface | Bus access and relinquish times <75 ns enable direct connection to 8051, 8085, Z80, and similar microprocessors without wait states |
| Separate analog/digital grounds | AGNDDAC, AGNDADC, and DGND pins allow PCB-level isolation - critical for maintaining >46 dB SNR in mixed-signal layouts |
| LC2MOS process technology | Integrates precision bipolar analog circuits with low-power CMOS logic on one die - achieves 2 µs ADC + 1 µs DAC settling in compact Q-24 package |
Applications
| Industrial Data Acquisition | Embedded Motor Control |
|---|---|
Use Scenario: Real-time monitoring of sensor outputs (temperature, pressure, current) in PLC I/O modules with local microprocessor-based processing. IC Role / Device Role / Timing Role: AD7569BQ serves as the sole analog front-end - digitizing sensor signals via its ADC and generating analog setpoints or actuator commands via its DAC. Use Value: Eliminates need for external op amps, references, and interface logic; reduces BOM count and layout area while guaranteeing matched ADC/DAC gain and offset over –40°C to +85°C. |
Use Scenario: Closed-loop speed/position control of DC or stepper motors in factory automation equipment using 8-bit microcontrollers. IC Role / Device Role / Timing Role: AD7569BQ provides feedback digitization (via VIN) and PWM-equivalent analog command generation (via VOUT) with sub-µs timing alignment between sample and update. Use Value: Synchronized 2 µs ADC and 2 µs DAC settling enables tight control loop execution (<10 µs total latency), improving dynamic response and reducing jitter in motor drive signals. |
| Test & Measurement Instrumentation | Medical Sensor Interface |
Use Scenario: Portable multichannel waveform generator and analyzer where compact size and low component count are critical. IC Role / Device Role / Timing Role: AD7569BQ acts as dual-role signal path element - generating calibrated test waveforms (DAC) and capturing response data (ADC) on shared 8-bit bus. Use Value: Single-chip integration reduces interconnect noise and timing skew; on-chip reference ensures consistent amplitude accuracy across generate-and-capture cycles. |
Use Scenario: Analog signal conditioning for ECG or EEG front-ends in portable diagnostic devices requiring low power and high reliability. IC Role / Device Role / Timing Role: AD7569BQ digitizes low-level biopotential signals (±1.25 V range) and generates patient-isolation feedback voltages or calibration offsets. Use Value: Bipolar input support enables true differential measurement; CERDIP packaging ensures long-term stability and hermetic protection against moisture-induced drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7569AQ | Same Q-24 CERDIP package and –40°C to +85°C rating, but ±1 LSB relative accuracy (vs. ±0.5 LSB for AD7569BQ) | Suitable for cost-sensitive industrial controls where 8-bit linearity tolerance can be relaxed | Select AD7569AQ if ±1 LSB DAC linearity meets system error budget and lower unit cost is prioritized. |
| AD7669BQ | Dual-DAC version in 28-pin Q-24-compatible PLCC; adds second buffered DAC output (VOUTB) and DAC-select A/B pin | Required when independent analog outputs (e.g., X/Y axis control, dual-channel stimulus) are needed | Choose AD7669BQ only when dual simultaneous DAC outputs are essential - not a drop-in replacement due to different pin count and package. |
Compared with AD7569AQ, AD7569BQ delivers tighter DAC linearity (±0.5 LSB vs. ±1 LSB) for higher-precision closed-loop control, while AD7669BQ expands functionality with dual DACs at the cost of increased pin count and no pin compatibility - making AD7569BQ optimal for space-constrained single-output systems demanding best-in-class 8-bit accuracy.
Availability
AD7569BQ is available at Aetrix Electronics and suitable for industrial data acquisition, embedded motor control, and portable test instrumentation requiring stable component supply across extended temperature ranges.
Supply support for AD7569BQ 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 AD7569BQ belongs to Analog Devices' legacy LC2MOS analog I/O family - designed specifically to integrate ADC, DAC, reference, and microprocessor interface into one chip for cost- and space-constrained industrial and embedded systems.
FAQ
What is the operating temperature range of the AD7569BQ?
The AD7569BQ is rated for industrial operation from –40°C to +85°C, as indicated by the "B" grade suffix in its part number. This range is validated per the REV. B datasheet and applies to all electrical specifications including DAC linearity (±0.5 LSB max), ADC SNR (46 dB min), and timing parameters such as WR pulse width (80 ns min) and conversion time (2 µs max).
Does the AD7569BQ require external components to operate?
No, the AD7569BQ is a complete analog I/O system requiring no external trims, op amps, or reference components. Its on-chip 1.25 V bandgap reference, R-2R DAC ladder, track/hold amplifier, and buffered output stage are fully integrated. Only decoupling capacitors (recommended 0.1 µF ceramic near VDD/DGND and AGND pins) and proper ground partitioning are needed for reliable operation.
How does the RANGE pin affect both ADC and DAC operation in the AD7569BQ?
The RANGE pin - in combination with VSS voltage - simultaneously configures the full-scale range for both the DAC output (VOUT) and ADC input (VIN). When VSS = 0 V and RANGE = 0, both operate in 0 to +1.25 V unipolar mode with binary coding; when VSS = –5 V and RANGE = 1, both operate in ±2.5 V bipolar mode with 2's complement coding - ensuring matched scaling across the entire analog signal chain.
What is the maximum sampling rate achievable with the AD7569BQ ADC?
The AD7569BQ ADC achieves a maximum sampling rate of 400 kHz, derived from its 2 µs max conversion time. This rate is specified with a 100 kHz full-scale sine wave input and is supported by the fast bus interface (t13 ≤ 90 ns data access time) and precise ST-triggered sampling control - enabling real-time capture of signals up to ~200 kHz bandwidth per Nyquist criterion.
Can the AD7569BQ operate from a single +5 V supply only?
Yes, the AD7569BQ fully supports single +5 V operation (VDD = +5 V, VSS = 0 V), delivering unipolar output/input ranges of 0 to +1.25 V or 0 to +2.5 V. In this mode, DAC data uses straight binary coding and the output amplifier maintains full sink capability above ~0.2 V; near 0 V, passive pull-down limits sink current - a design feature documented in the "OP AMP SECTION" of the datasheet.
AD7569BQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LC²MOS
- Package/Case:
- 24-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Applications:
- Analog I/O
- Interface:
- Bus
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- 24-CDIP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
AD7569BQ FAQ
1.How can I place an order for AD7569BQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7569BQ 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 AD7569BQ reliable?
The price and inventory of AD7569BQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7569BQ is usually 5 days.
3.What payment methods are accepted for AD7569BQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7569BQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7569BQ?
AD7569BQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7569BQ 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 AD7569BQ?
For technical support, including AD7569BQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7569BQ requirements.
6.How does Aetrix verify that AD7569BQ is sourced from the original manufacturer or authorized distributors?
All AD7569BQ 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 AD7569BQ meets industry standards.
7.What is the process for return or replacement of AD7569BQ?
All AD7569BQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7569BQ, 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 AD7569BQ part is unused and in its original packaging.
Return procedure for AD7569BQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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