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Analog Devices Inc. ADADC71KD
- Part No.:
- ADADC71KD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-CDIP (0.910", 23.12mm)
- Datasheet:
-
ADADC71KD.pdf
- Description:
- IC ADC 16BIT SAR 32BBDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,151
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Product details
Overview
ADADC71KD from Analog Devices is a hermetic 32-pin ceramic DIP hybrid IC 16-bit successive-approximation analog-to-digital converter with integrated reference (6.3 V), internal clock (400 kHz), laser-trimmed thin-film scaling resistors, and TTL-compatible parallel outputs. It delivers ±0.003% linearity error (K grade), 35 μs typical conversion time to 14 bits, and supports ±2.5 V to ±10 V and 0 to +20 V input ranges - used in precision medical instrumentation and multi-channel data acquisition systems.
For engineers reviewing the ADADC71KD datasheet, ADADC71KD pinout, ADADC71KD application, or ADADC71KD equivalent, this page provides verified technical context, exact pin functions, real-world use-value per application, validated alternatives with documented functional differences, and supply support for industrial embedded design and OEM production programs.
Technical Context
The ADADC71KD implements a monolithic 16-bit SAR architecture with integrated 16-bit DAC feedback, comparator, and laser-trimmed thin-film resistor network enabling ±0.003% FSR linearity and guaranteed no missing codes to 14 bits over 0°C to +70°C. Its internal 400 kHz clock drives 17-cycle conversion timing, with STATUS output synchronized to LSB validity.
Digital interface uses complementary straight binary (CSB) for unipolar ranges and complementary offset binary (COB) for bipolar ranges; MSB inversion enables complementary two's complement (CTC). Short Cycle pin (Pin 32) allows resolution-selectable conversion termination - e.g., 35.6 μs max for 10-bit mode when tied to Pin 11.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR with guaranteed monotonicity and no missing codes to 14 bits at 25°C |
| Linearity Error | ±0.003% FSR (K grade), enabling <1 LSB error across full-scale range for high-accuracy calibration |
| Conversion Time | 35 μs typical / 50 μs max to 14 bits; reduced via Short Cycle pin for 8–15 bit modes |
| Analog Input Ranges | ±2.5 V, ±5 V, ±10 V, 0 to +5 V, 0 to +10 V, 0 to +20 V - selectable via external pin connections |
| Reference Voltage | 6.3 V internal reference with ±5% initial error and ±10 ppm/°C tempco - stable enough for 14-bit accuracy without external ref |
| Power Consumption | 645 mW typical (±15 V @ ±16/−21 mA, +5 V @ +18 mA) - optimized for high-resolution, low-noise operation |
| Digital Interface | TTL-compatible parallel outputs (CSB/COB/CTC), STATUS flag, and CLOCK OUT - no serial interface post-date code 0120 |
Pinout & Package
Package: 32-pin hermetic ceramic dual-in-line package (DIP), 0.600" wide, with index notch adjacent to Pin 1. Hermetic sealing ensures long-term stability in industrial and medical environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MSB) | Most Significant Bit Output | Complementary logic output; inversion yields CTC coding for bipolar ranges |
| 13–14 (BIT 13–14) | LSB-for-13/14-bit Outputs | Enable short-cycle truncation at 13- or 14-bit resolution without software overhead |
| 22 | Analog Common | Separate analog ground return - must be externally tied to Pin 19 (Digital Common) at single point near device |
| 27 | Comparator Input | High-impedance node sensitive to noise; requires guarding by analog common per layout guidelines |
| 29 | Gain Adjust | Connects to external 100 ppm/°C potentiometer for trimming gain error to ≤0.05% FSR |
| 31 | Convert Command | Trailing-edge-triggered LSTTL input; initiates 17-cycle conversion sequence and sets STATUS flag |
| 32 | Short Cycle | Input that terminates conversion after selected bit - tied to Pin 11 for 10-bit mode (35.6 μs max) |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film scaling network | Enables six factory-configurable input ranges (±2.5 V to 0–+20 V) without external op-amps or gain switches |
| Internal 6.3 V reference with ±10 ppm/°C drift | Eliminates need for external precision reference in 14-bit applications; reduces BOM count and layout area |
| STATUS flag synchronized to LSB validity | Allows reliable latch timing - data valid ≥20 ns before STATUS falls, enabling direct connection to TTL registers |
| Short Cycle resolution control | Hardware-selectable 8–16 bit modes reduce conversion time by up to 40% vs. full 16-bit cycle without firmware changes |
| Hermetic ceramic DIP packaging | Ensures long-term parameter stability in humid, high-reliability environments (e.g., medical analyzers, lab equipment) |
Applications
| Medical Instrumentation | Precision Industrial Robotics |
|---|---|
Use Scenario: High-accuracy analog signal digitization in clinical blood gas analyzers requiring stable 14-bit resolution over 0°C–50°C ambient. IC Role / Device Role / Timing Role: Primary ADC capturing sensor outputs (pH, pO₂, pCO₂) with calibrated COB coding and internal reference stability. Use Value: ±0.003% linearity and no missing codes to 14 bits ensure diagnostic-grade measurement repeatability without periodic recalibration. |
Use Scenario: Real-time joint torque feedback in servo-controlled robotic arms where analog encoder signals must resolve sub-mV changes. IC Role / Device Role / Timing Role: High-stability ADC interfacing strain gauge bridges with ±10 V bipolar input and short-cycle 12-bit mode (42.8 μs). Use Value: Laser-trimmed thin-film resistors maintain gain/offset drift ≤±15 ppm/°C, preserving closed-loop accuracy across thermal cycles. |
| Automatic Test Equipment (ATE) | Multi-Channel Data Acquisition |
Use Scenario: Modular ATE slot card digitizing DC calibration standards and sensor references under controlled lab conditions. IC Role / Device Role / Timing Role: Precision reference-grade ADC using 0–+10 V unipolar CSB mode, internal 6.3 V ref, and gain/offset trim capability. Use Value: ±0.052% unipolar offset error and ±0.12% gain error - trimmable to zero - enable traceable NIST-level calibration workflows. |
Use Scenario: 16-channel vibration monitoring system sampling accelerometers across ±5 V range with synchronized conversions. IC Role / Device Role / Timing Role: Parallel-output ADC with STATUS flag enabling simultaneous latching of all channels via shared clock edge. Use Value: TTL-compatible outputs and 35 μs typical conversion allow >28 kSPS aggregate throughput with deterministic timing across channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7896ARZ | 12-bit SAR ADC, 100 kSPS, internal reference, SOIC-24 package | Lower resolution (12-bit), higher speed, surface-mount only - lacks laser-trimmed thin-film scaling for multi-range flexibility | Select when cost, size, or speed outweigh 14-bit linearity requirements; not suitable for medical diagnostics or metrology-grade calibration |
| ADS8588SIPM | 18-bit SAR ADC, 100 kSPS, external reference required, QFN-48 package | Higher resolution but no integrated reference or scaling network; requires external op-amp driver and precision ref circuitry | Select for ultra-high-resolution applications where board space permits added components and layout complexity; ADADC71KD offers lower system-level BOM count |
Compared with AD7896ARZ and ADS8588SIPM, the ADADC71KD uniquely combines hermetic reliability, multi-range analog input flexibility via pin-strapping, and guaranteed 14-bit no-missing-codes performance - making it irreplaceable in legacy medical and industrial instrumentation where field longevity and calibration stability are mandatory.
Availability
ADADC71KD is available at Aetrix Electronics and suitable for medical instrumentation, precision industrial robotics, and automatic test equipment requiring stable component supply, long-lifecycle support, and hermetic packaging integrity.
Supply support for ADADC71KD 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADADC71KD belongs to Analog Devices' legacy high-resolution hybrid ADC product line, designed specifically for applications demanding long-term stability, hermetic reliability, and factory-calibrated multi-range analog input capability - particularly in medical diagnostics and industrial automation.
FAQ
What is the maximum guaranteed linearity error for ADADC71KD?
The ADADC71KD (K grade) guarantees ±0.003% of full-scale range (FSR) linearity error at +25°C, as specified in the Rev. C datasheet. This corresponds to less than ±1 LSB error across its 16-bit transfer function for 14-bit effective resolution. The J grade variant specifies ±0.006% FSR, but ADADC71KD is explicitly K grade per ordering guide and specification tables.
Does ADADC71KD support serial output communication?
No, ADADC71KD does not support serial output. The datasheet explicitly states: "The serial output function is no longer available after date code 0120." ADADC71KD provides only parallel TTL-compatible digital outputs (Pins 1–16), STATUS (Pin 18), and CLOCK OUT (Pin 20); all timing and data handshaking is synchronous to the internal 400 kHz clock.
How is analog input range selected on ADADC71KD?
Analog input range on ADADC71KD is selected by external pin connections per Table 4 in the datasheet: Pin 26 (BIPOLAR OFFSET) and Pin 24 (+20V) determine coding (COB vs. CSB), while the analog signal is connected to Pin 25 (+10V), Pin 24 (+20V), or directly to Pin 27 (COMPARATOR IN) depending on range. No register writes or digital configuration are needed - selection is purely hardware-strapped.
What is the purpose of Pin 32 (SHORT CYCLE) on ADADC71KD?
Pin 32 (SHORT CYCLE) on ADADC71KD terminates the internal 17-cycle conversion sequence early to achieve faster throughput at reduced resolution. When tied to Pin 11, it enables 10-bit mode (max 35.6 μs); tying to Pins 13–16 selects 12–15 bit modes. This hardware-based resolution control avoids firmware latency and preserves timing determinism in real-time systems.
Can ADADC71KD operate with only +5 V and ground supplies?
No, ADADC71KD requires three independent power supplies: ±15 V DC (Pins 28 and 21) for analog circuitry and +5 V DC (Pin 30) for digital logic. The absolute maximum ratings specify ±18 V supply voltage, and the datasheet confirms ±15 V ±0.5 V analog and +5 V ±0.25 V digital rails are mandatory. Omitting either ±15 V rail will prevent proper operation of the internal DAC, comparator, or reference.
ADADC71KD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 32-CDIP (0.910", 23.12mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 20k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- ±15V
- Voltage - Supply, Digital:
- ±5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 32-BBDIP-H
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADADC71KD FAQ
1.How can I place an order for ADADC71KD through Aetrix?
Please submit a Request for Quotation (RFQ) for ADADC71KD 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 ADADC71KD reliable?
The price and inventory of ADADC71KD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADADC71KD is usually 5 days.
3.What payment methods are accepted for ADADC71KD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADADC71KD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADADC71KD?
ADADC71KD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADADC71KD 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 ADADC71KD?
For technical support, including ADADC71KD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADADC71KD requirements.
6.How does Aetrix verify that ADADC71KD is sourced from the original manufacturer or authorized distributors?
All ADADC71KD 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 ADADC71KD meets industry standards.
7.What is the process for return or replacement of ADADC71KD?
All ADADC71KD units undergo pre-shipment inspection (PSI). If there is an issue with ADADC71KD, 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 ADADC71KD part is unused and in its original packaging.
Return procedure for ADADC71KD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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