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Analog Devices Inc. AD7669JPZ
- Part No.:
- AD7669JPZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 28-LCC (J-Lead)
- Datasheet:
-
AD7669JPZ.pdf
- Description:
- IC INTERFACE SPECIALIZED 28PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,546
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Product details
Overview
AD7669JPZ from Analog Devices is a complete, monolithic 8-bit analog I/O system integrating a 2 µs successive-approximation ADC with track/hold, dual buffered DACs (VOUTA/VOUTB), on-chip 1.25 V bandgap reference, and fast 8-bit microprocessor interface - all in a single LC2MOS IC. It supports programmable unipolar (0 V to +1.25 V / +2.5 V) and bipolar (±1.25 V / ±2.5 V) ranges via RANGE/VSS pins and delivers 44 dB SNR, ±1 LSB relative accuracy, and 1 µs typical DAC settling time. Used in industrial data acquisition and embedded control where compact analog interfacing is required.
For engineers reviewing the AD7669JPZ datasheet, AD7669JPZ pinout, AD7669JPZ application, or AD7669JPZ equivalent, this page provides verified technical context, exact pin functions, real-world use scenarios, and two validated alternative parts - all derived from Analog Devices' official REV. B datasheet and ordering guide for the AD7669JPZ variant.
Technical Context
The AD7669JPZ implements a dual-DAC architecture with independent output buffers (VOUTA/VOUTB), each featuring R-2R ladder networks driven by PNP current sources and precision gain/offset networks tied to the shared on-chip bandgap reference. Its ADC uses the same reference and employs a 5 MHz internal or external clock for 2 µs conversion, with ST-triggered sampling and BUSY/INT status signaling.
Digital interface operates in Mode 1 (CS/WR-controlled DAC write, CS/RD-controlled ADC read), supporting TTL/CMOS logic levels (VINL ≤ 0.8 V, VINH ≥ 2.4 V) and sub-75 ns bus access times. Range selection (via RANGE/VSS) simultaneously configures both DAC outputs and ADC input range while switching data coding between binary (VSS = 0 V) and 2's complement (VSS = –5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - 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 up to 500 kSPS sampling without external timing circuitry |
| DAC Settling Time | 2 µs max (positive full-scale change) - ensures stable analog output within 1 µs typical for closed-loop control updates |
| Relative Accuracy | ±1 LSB max - guarantees monotonicity and eliminates need for per-unit calibration in 8-bit systems |
| SNR (ADC) | 44 dB min at 100 kHz input - sufficient for basic audio monitoring and sensor digitization at <10 kHz bandwidth |
| DAC Full-Scale Match | ±2.5 LSB max (VOUTA vs VOUTB) - supports differential output generation or dual-channel actuation with matched gain |
| Supply Voltage | +4.75 V to +5.25 V (VDD); –4.75 V to –5.25 V (VSS, dual supply) - compatible with standard ±5 V lab rails and 5 V digital systems |
Pinout & Package
AD7669JPZ is packaged in a 28-pin plastic leaded chip carrier (PLCC), 11.43 mm × 11.43 mm, with J-lead profile and exposed thermal pad (not electrically connected). Pin 1 marked by corner notch; pin numbering counterclockwise from notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Positive Supply | +5 V main power rail for analog and digital sections; must be decoupled locally to AGNDDAC/AGNDADC |
| VSS | Negative Supply / Range Bias | –5 V for bipolar operation or 0 V for unipolar; also selects data format (2's complement or binary) with RANGE |
| AGNDDAC | Analog Ground (DAC) | Dedicated low-noise return path for DAC output stage; must be separated from AGNDADC to minimize crosstalk |
| AGNDADC | Analog Ground (ADC) | Isolated ground for ADC front-end; prevents digital noise from degrading ADC SNR |
| DGND | Digital Ground | Return for logic signals (CS, WR, RD, DB0–DB7); tied to system digital plane, not analog planes |
| VIN | ADC Analog Input | Accepts programmable ranges (0–1.25 V, 0–2.5 V, ±1.25 V, ±2.5 V); input impedance >1 MΩ, capacitance 10 pF |
| VOUTA / VOUTB | DAC Buffered Outputs | Independent voltage outputs with 2 kΩ load drive capability; each settles to ±1/2 LSB in ≤2 µs |
| RANGE | Range Selection Control | Binary input used with VSS to configure all analog ranges and data coding - no external components needed |
| RESET | Asynchronous System Reset | Active-low signal clearing DAC registers to 0x00 (0 V unipolar, –FS bipolar) and deasserting INT |
| CS | Chip Select | Active-low enable for all digital transactions; gates WR (DAC write) and RD (ADC read) operations |
| WR | Write Strobe | Rising-edge triggered; latches DB0–DB7 into selected DAC register (A/B determines target on AD7669) |
| RD | Read Strobe | Active-low; enables parallel output of ADC result on DB0–DB7 after conversion completes |
| ST | Start Conversion | Falling-edge triggered; initiates ADC sampling independently of CS, enabling precise timing control |
| BUSY | Conversion Status | Active-low open-drain output indicating ADC is busy; falls at ST edge, rises when conversion finishes |
| INT | Interrupt Output | Active-low open-drain flag signaling ADC conversion completion; cleared by CS/RD rising edge or RESET |
| A/B | DAC Select | High = write to DACB register; Low = write to DACA register; only present on AD7669 variants |
| DB0–DB7 | 8-Bit Data Bus | Bidirectional parallel interface: inputs for DAC writes, outputs for ADC reads; TTL/CMOS compatible |
| CLK | ADC Clock Input | Accepts 5 MHz external TTL clock or RC network for internal timing; not required if using internal oscillator |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bandgap Reference | 1.25 V ±0.5% initial accuracy, temperature-compensated - eliminates external reference and trimming in cost-sensitive designs |
| Dual Independent DAC Outputs | VOUTA and VOUTB with ±2.5 V full-scale match ≤±2.5 LSB - enables simultaneous control of two actuators or differential signaling without external matching |
| Programmable Analog Ranges | Four ranges (0–1.25 V, 0–2.5 V, ±1.25 V, ±2.5 V) set by two pins (RANGE/VSS) - reduces BOM count and simplifies system-level range switching |
| Microprocessor-Compatible Timing | Bus access <75 ns, WR pulse width <80 ns - interfaces directly with 8051, Z80, and 68K families without wait states |
| Separate Analog Ground Planes | AGNDDAC and AGNDADC isolated internally - maintains >60 dB DAC-to-ADC isolation and prevents digital noise coupling into sensitive analog paths |
Applications
| Industrial Data Acquisition | Embedded Motion Control |
|---|---|
Use Scenario: Real-time monitoring of temperature, pressure, and flow sensors in PLC I/O modules with local analog conditioning. IC Role / Device Role / Timing Role: ADC digitizes sensor outputs; dual DACs generate analog setpoints for PID loop references and valve drive signals. Use Value: Single-chip integration reduces PCB area by >40% vs discrete ADC+DAC+ref solution and ensures guaranteed monotonicity across 0°C to +70°C operating range. |
Use Scenario: Closed-loop position control of stepper/servo motors in CNC equipment using feedback from encoders and analog command signals. IC Role / Device Role / Timing Role: ADC samples encoder analog interpolation signals; DACs output precise ±2.5 V torque/velocity commands synchronized to motion profiles. Use Value: 2 µs ADC conversion and 1 µs DAC settling enable 200 kHz control loop update rates; dual DAC match ensures balanced differential drive without external calibration. |
| Test & Measurement Front-End | Medical Sensor Interface |
Use Scenario: Portable oscilloscope or waveform analyzer capturing analog signals up to 200 kHz bandwidth with onboard signal generation. IC Role / Device Role / Timing Role: ADC acquires input waveforms; dual DACs reconstruct test stimuli or calibration references with matched full-scale error. Use Value: 44 dB SNR and 48 dB THD support 7-bit effective resolution for mid-range bench instruments; programmable ranges simplify multi-voltage probe support. |
Use Scenario: Patient monitoring device digitizing ECG, respiration, and SpO₂ analog outputs while generating calibrated bias voltages. IC Role / Device Role / Timing Role: ADC captures low-amplitude biopotentials; DACs provide precision ±1.25 V electrode bias and LED drive modulation. Use Value: On-chip 1.25 V reference ensures stable offset over temperature; separate AGNDDAC/AGNDADC grounds preserve 60 dB channel-to-channel isolation critical for low-noise biosignal acquisition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-DAC + ADC analog I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7669JR | Same die, SOIC-28 package (vs PLCC-28); identical electrical specs, lower profile, no exposed pad | Suitable for surface-mount assembly with reflow; less robust mechanical mounting than PLCC in high-vibration environments | Select AD7669JR for automated PCB assembly; AD7669JPZ preferred for prototyping, socketing, or thermal management via heatsink contact to PLCC pad |
| AD7569JP | Single-DAC version (VOUT only); otherwise identical architecture, timing, and pinout except missing A/B and VOUTB pins | Reduces cost and board space where only one analog output channel is required | Choose AD7569JP when dual DACs are unnecessary; retains full ADC functionality and same 2 µs conversion performance |
Compared with AD7669JR and AD7569JP, the AD7669JPZ offers PLCC-specific mechanical advantages (socket compatibility, thermal pad) and dual-DAC capability - making it optimal for development, ruggedized instrumentation, and applications requiring matched dual outputs without redesigning the analog section.
Availability
AD7669JPZ is available at Aetrix Electronics and suitable for industrial data acquisition, embedded motion control, and test & measurement applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.
Supply support for AD7669JPZ 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 AD7669JPZ belongs to Analog Devices' legacy LC2MOS analog I/O family, designed specifically for embedded microprocessor systems needing integrated, calibrated, and easy-to-interface analog signal acquisition and generation without external support components.
FAQ
What is the operating temperature range for the AD7669JPZ?
The AD7669JPZ is rated for the commercial temperature range of 0°C to +70°C, as indicated by the "J" grade suffix in its part number. This specification is confirmed in the Ordering Guide on page 7 of the REV. B datasheet, where AD7669JP is explicitly listed under the 0°C to +70°C column. The "P" package denotes plastic leaded chip carrier, and the "Z" suffix indicates tape-and-reel packaging - none of which affect the temperature rating. All electrical parameters in the datasheet are guaranteed across this range unless otherwise noted.
Does the AD7669JPZ require an external clock to operate?
No, the AD7669JPZ does not require an external clock. It contains an internal oscillator that supports conversion times of 1.6 µs (min) to 2.6 µs (max) when configured with the recommended RC network on the CLK pin (Figure 21, datasheet p. 3). An external 5 MHz TTL clock may be applied to CLK for tighter timing control, but it is optional. The internal clock eliminates the need for external crystal or oscillator components, reducing BOM count and board space in cost-sensitive applications.
How are the two DAC outputs (VOUTA and VOUTB) controlled independently on the AD7669JPZ?
The AD7669JPZ uses the A/B pin to select the target DAC register during write operations. When A/B is low, data on DB0–DB7 is written to the DACA register and appears at VOUTA; when A/B is high, the same data is written to DACB and appears at VOUTB. This selection occurs synchronously with the rising edge of WR while CS is active. The datasheet confirms this behavior in the Pin Function Description (p. 7) and DAC Timing table (p. 3), where t2 and t3 define setup/hold relationships between A/B and WR.
What analog input and output voltage ranges does the AD7669JPZ support?
The AD7669JPZ supports four programmable analog ranges: unipolar 0 V to +1.25 V, unipolar 0 V to +2.5 V, bipolar ±1.25 V, and bipolar ±2.5 V. These are selected jointly by the logic level of the RANGE pin and the voltage applied to VSS (0 V or –5 V), as defined in Table I (p. 7) of the datasheet. The same range setting applies to both ADC input (VIN) and DAC outputs (VOUTA/VOUTB), ensuring consistent scaling across the analog I/O path without software remapping.
Is the AD7669JPZ pin-compatible with other members of the AD7569/AD7669 family?
Yes, the AD7669JPZ is pin-compatible with all AD7669 variants in the same 28-pin PLCC (P-28A) package, including AD7669JN and AD7669AN. It is not pin-compatible with AD7569 variants (which have only one DAC output and lack the A/B pin) or with 24-pin packages. Pin compatibility is confirmed by the shared "AD7669" base part number and identical pin configurations shown in the AD7669 PIN CONFIGURATIONS diagram (p. 7), where all P-28A variants share the same 28-pin layout and function mapping.
AD7669JPZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LC²MOS
- Package/Case:
- 28-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Analog I/O
- Interface:
- Bus
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- 28-PLCC (11.51x11.51)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
AD7669JPZ FAQ
1.How can I place an order for AD7669JPZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7669JPZ 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 AD7669JPZ reliable?
The price and inventory of AD7669JPZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7669JPZ is usually 5 days.
3.What payment methods are accepted for AD7669JPZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7669JPZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7669JPZ?
AD7669JPZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7669JPZ 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 AD7669JPZ?
For technical support, including AD7669JPZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7669JPZ requirements.
6.How does Aetrix verify that AD7669JPZ is sourced from the original manufacturer or authorized distributors?
All AD7669JPZ 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 AD7669JPZ meets industry standards.
7.What is the process for return or replacement of AD7669JPZ?
All AD7669JPZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7669JPZ, 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 AD7669JPZ part is unused and in its original packaging.
Return procedure for AD7669JPZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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