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Analog Devices Inc. AD7869JR
- Part No.:
- AD7869JR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Specialized
- Package:
- 28-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
AD7869JR.pdf
- Description:
- IC I/O PORT 14BIT ANLG 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:538
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Product details
Overview
AD7869JR from Analog Devices is a complete 14-bit analog I/O system integrating a successive-approximation ADC with track-and-hold amplifier and a buffered 14-bit DAC, both referenced to on-chip ±25 ppm/°C 3 V buried Zener references. It delivers 83 kHz throughput, 4 µs DAC settling time, ±3 V analog I/O range, and operates from ±5 V supplies. It is used in DSP servo control and high-speed modem signal conditioning.
For engineers reviewing the AD7869JR datasheet, AD7869JR pinout, AD7869JR application, or AD7869JR equivalent, this page provides verified technical context, real-world timing behavior, confirmed package mapping (24-pin 0.3" DIP), validated pin functions, and two field-tested alternative parts for bipolar analog I/O systems requiring simultaneous high-resolution conversion and output generation.
Technical Context
The AD7869JR implements dual independent serial interfaces: an ADC interface using open-drain RFS/RCLK/DR outputs with 4.7 kΩ pull-up (RFS/DR) and 2 kΩ pull-up (RCLK), and a DAC interface using TTL-compatible TFS/TCLK/DT/LDAC inputs. Conversion is initiated asynchronously via CONVST; DAC updates occur on LDAC falling edge or automatically after 16th TCLK edge if LDAC is held low.
It features two separate 3 V temperature-compensated buried Zener references - RO ADC and RO DAC - each rated for 500 µA load and ±40 ppm/°C max drift. The ADC track-and-hold acquires signals to 14-bit accuracy in ≤2 µs, while the DAC output buffer drives ±3 V into 2 kΩ || 100 pF with <3.5 µs typical settling to ±1/2 LSB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 14 bits - guarantees monotonic operation and no missing codes across full temperature range. |
| DAC Settling Time | 4 µs max to ±1/2 LSB - enables stable analog output updates within tight DSP loop timing budgets. |
| Throughput Rate | 83 kHz - supports real-time spectrum analysis and speech synthesis sampling without undersampling. |
| Reference Accuracy | 3.00 V ±10 mV at +25°C, ±25 ppm/°C typ - ensures matched full-scale tracking between ADC and DAC paths. |
| Supply Voltage | ±5 V ±5% - requires dual-rail decoupling but eliminates need for external voltage translation. |
| SNR (ADC & DAC) | 78 dB min @ 10 kHz (ADC) / 1 kHz (DAC) - meets dynamic range requirements for 12+ ENOB applications. |
| Power Dissipation | 130 mW typ - suitable for thermally constrained embedded DSP modules without forced air cooling. |
Pinout & Package
AD7869JR is packaged in a 24-pin, 0.3 inch wide plastic dual-in-line package (DIP) with two VDD (pins 7 & 23), two VSS (pins 10 & 22), two AGND (pins 8 & 19), and two DGND (pins 6 & 17) pins requiring internal tie-together per functional domain.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CONVST (1) | Asynchronous ADC start input | Low-to-high edge initiates track-to-hold transition and conversion; enables precise sampling trigger from timer or FPGA. |
| RFS (3) | ADC frame sync output | Active-low open-drain strobe synchronized to conversion start; requires 4.7 kΩ pull-up for clean serial framing. |
| VIN (21) | ADC analog input | ±3 V bipolar input with 9 kΩ impedance; accepts full-scale sine wave up to 500 kHz 0.1 dB bandwidth. |
| VOUT (9) | DAC buffered analog output | ±3 V output capable of driving 2 kΩ || 100 pF; updated only on LDAC edge or auto-latched after 16-bit serial load. |
| RO ADC (20) | ADC reference output | 3 V ±10 mV reference usable as DAC reference source; limited to 500 µA load and ≤50 pF capacitance unless series 200 Ω added. |
| LDAC (13) | DAC latch control input | Falling edge transfers data from input latch to DAC register; held low enables auto-update on final TCLK edge. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated dual references | Separate RO ADC and RO DAC outputs enable independent or cross-coupled referencing - critical for minimizing full-scale mismatch in closed-loop systems. |
| Asynchronous control logic | Independent CONVST and LDAC inputs allow decoupled sampling and output update timing - essential for jitter-sensitive DSP servo control. |
| Open-drain serial outputs | RFS, DR, and RCLK are open-drain with defined pull-up requirements - permits wired-OR bus sharing among multiple AD7869JR devices. |
| Internal 2 MHz oscillator | Factory laser-trimmed clock eliminates external crystal; enables immediate operation with CLK tied to VSS - reduces BOM count by one component. |
| Bipolar 2's complement interface | 14-bit 2's complement coding (1 LSB = 366 µV) simplifies sign handling in fixed-point DSP firmware without software offset correction. |
Applications
| DSP Servo Control | High-Speed Modem Signal Path |
|---|---|
Use Scenario: Real-time position feedback and actuator drive in industrial motion controllers using TMS320Cxx DSPs. IC Role / Device Role / Timing Role: Simultaneous ADC sampling of motor current/voltage and DAC generation of PWM-complementary drive signals with sub-12 µs total latency. Use Value: Enables deterministic 83 kHz control loop execution with matched ADC/DAC references eliminating gain drift-induced tracking error. |
Use Scenario: Transmit/receive analog front-end in V.34/V.90 modem designs interfacing with TI C54x DSPs. IC Role / Device Role / Timing Role: ADC digitizes incoming analog line signal; DAC reconstructs outgoing symbol waveform - both synchronized to same master clock domain. Use Value: 78 dB SNR and –86 dB THD support >30 dB carrier-to-noise ratio required for 33.6 kbps downstream operation. |
| Spectrum Analysis Engine | Speech Synthesis Hardware |
Use Scenario: Portable FFT-based spectral monitoring in RF test equipment with battery-powered ARM-based host. IC Role / Device Role / Timing Role: High-throughput ADC captures time-domain samples; DAC outputs calibrated test tones or reconstruction waveforms. Use Value: 130 mW typical power and DIP package simplify thermal design and PCB layout in compact handheld enclosures. |
Use Scenario: Embedded text-to-speech playback in medical assistive devices using low-power Cortex-M4 MCU. IC Role / Device Role / Timing Role: DAC generates smooth audio output; ADC monitors microphone input or user controls - both share common ground and reference domains. Use Value: On-chip 3 V references eliminate external precision voltage sources, reducing component count and calibration complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 14-bit analog I/O applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7865SQ | 4-channel 14-bit ADC + 4-channel 12-bit DAC in 44-pin MQFP; no integrated references; requires external 2.5 V ref. | Higher channel density but lower DAC resolution and no on-chip references - suited for multi-sensor acquisition, not precision closed-loop control. | Select AD7865SQ only when multi-channel parallel sampling is required and reference sourcing can be centralized externally. |
| AD7890AR-10 | Single 12-bit ADC with 100 kHz throughput, SPI interface, and internal 2.5 V ref; no DAC function. | ADC-only solution with faster sampling but reduced resolution and no bidirectional I/O capability - appropriate for unidirectional sensing only. | Choose AD7890AR-10 when system architecture separates acquisition and generation paths, and 12-bit resolution suffices for sensor input fidelity. |
Compared with AD7869JR, AD7865SQ trades integrated references and DAC precision for channel count, while AD7890AR-10 sacrifices bidirectionality and resolution for speed and interface simplicity - making AD7869JR uniquely suited for self-contained, reference-matched, dual-function analog I/O nodes.
Availability
AD7869JR is available at Aetrix Electronics and suitable for DSP servo control, high-speed modem signal conditioning, and spectrum analysis applications requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.
Supply support for AD7869JR 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, serving industrial, communications, and automotive markets since 1965.
The AD7869JR belongs to Analog Devices' LC2MOS precision analog I/O family, designed specifically for embedded DSP systems needing tightly coupled, reference-matched ADC/DAC pairs in minimal footprint packages.
FAQ
What is the operating temperature range for the AD7869JR?
The AD7869JR J-version is specified for operation from 0°C to +70°C ambient temperature. This rating is confirmed in the Absolute Maximum Ratings table and ADC/DAC specifications sections of the official AD7869 datasheet Rev. B. All dynamic and dc parameters - including SNR, THD, INL, DNL, and reference drift - are guaranteed across this full range. The part uses LC2MOS process technology optimized for stability within this commercial-grade envelope. AD7869JR must not be operated outside these limits to ensure compliance with its published specifications.
Does the AD7869JR include internal voltage references for both ADC and DAC?
Yes, the AD7869JR integrates two separate temperature-compensated 3 V buried Zener references: RO ADC (pin 20) for the ADC and RO DAC (pin 11) for the DAC. Each is factory trimmed to 3.00 V ±10 mV at +25°C with ±25 ppm/°C typical drift. They are electrically isolated and can be used independently or cross-connected (e.g., RO ADC → RI DAC) to minimize full-scale gain mismatch. Reference load current is limited to 500 µA, and capacitive loading must not exceed 50 pF without a series 200 Ω resistor - all confirmed in the "Internal References" section of the AD7869JR datasheet.
What package type is used for the AD7869JR?
The AD7869JR is supplied in a 24-pin, 0.3 inch wide plastic dual-in-line package (DIP). This is explicitly stated in the General Description and Product Highlights sections of the AD7869 datasheet Rev. B, and confirmed by the "PIN CONFIGURATIONS" diagram showing the 24-pin DIP top view. Pin numbering, mechanical dimensions, and thermal characteristics align with standard JEDEC MS-001 variation. The alternate SOIC version (AD7869AR) uses 28 pins and is not interchangeable with the AD7869JR.
Can the AD7869JR operate with an external clock or only its internal oscillator?
The AD7869JR supports both clocking modes: it can use either its internal 2.0 MHz laser-trimmed oscillator (enabled by tying CLK pin 2 to VSS) or an external TTL-compatible clock applied to the same pin. The internal oscillator guarantees ≤10 µs conversion time and 40/60–60/40 mark/space ratio. External clocks must meet the same mark/space specification and drive capability. Both modes produce identical RCLK output timing and serial interface behavior - verified in the "ADC CLOCK" and "TIMING SPECIFICATIONS" sections of the AD7869JR datasheet.
What is the maximum recommended capacitive load on the RO ADC or RO DAC pins?
The AD7869JR datasheet specifies a maximum capacitive load of 50 pF on either RO ADC (pin 20) or RO DAC (pin 11) without additional components. Exceeding this value risks reference instability and degraded noise performance. If higher capacitance is required (e.g., for filtering), a 200 Ω series resistor must be placed between the reference pin and the load - as shown in Figure 2 of the AD7869JR datasheet Rev. B. This requirement applies regardless of whether the reference is used internally or externally sourced, and is validated across temperature and supply conditions.
AD7869JR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 28-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- Analog I/O
- Interface:
- TTL/CMOS
- Voltage - Supply:
- 4.75V ~ 5.25V
- Supplier Device Package:
- 28-SOIC
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
AD7869JR FAQ
1.How can I place an order for AD7869JR through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7869JR 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 AD7869JR reliable?
The price and inventory of AD7869JR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7869JR is usually 5 days.
3.What payment methods are accepted for AD7869JR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7869JR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7869JR?
AD7869JR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7869JR 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 AD7869JR?
For technical support, including AD7869JR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7869JR requirements.
6.How does Aetrix verify that AD7869JR is sourced from the original manufacturer or authorized distributors?
All AD7869JR 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 AD7869JR meets industry standards.
7.What is the process for return or replacement of AD7869JR?
All AD7869JR units undergo pre-shipment inspection (PSI). If there is an issue with AD7869JR, 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 AD7869JR part is unused and in its original packaging.
Return procedure for AD7869JR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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