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Analog Devices Inc. ADADC71JD
- Part No.:
- ADADC71JD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 32-CDIP (0.910", 23.12mm)
- Datasheet:
-
ADADC71JD.pdf
- Description:
- IC ADC 16BIT SAR 32BBDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,748
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Product details
Overview
ADADC71JD from Analog Devices is a high-resolution 16-bit hybrid SAR analog-to-digital converter with integrated reference, clock, and laser-trimmed thin-film scaling resistors. 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 V to +20 V input ranges - used in precision medical instrumentation and multi-channel data acquisition systems.
For engineers reviewing the ADADC71JD datasheet, ADADC71JD pinout, ADADC71JD application, or ADADC71JD equivalent, this page provides verified technical context, exact pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and application-level differences - all grounded in Rev. C datasheet specifications and Analog Devices' official ordering guide.
Technical Context
The ADADC71JD implements a 16-bit successive-approximation register (SAR) architecture with monolithic DAC feedback and proprietary thin-film resistor networks for inherent linearity. Its internal 400 kHz clock drives 17-cycle conversion timing, with STATUS output synchronized to trailing-edge CONVERT command initiation.
Digital outputs are TTL-compatible parallel signals in complementary straight binary (CSB) for unipolar ranges or complementary offset binary (COB) for bipolar ranges; MSB inversion enables complementary two's complement (CTC). Short cycle capability allows resolution reduction (8–15 bits) via Pin 32 connection to selected bit outputs, enabling configurable throughput from 28.5 μs (8-bit) to 57.0 μs (16-bit).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit SAR with guaranteed no missing codes to 14 bits at 0°C to +70°C. |
| Linearity Error | ±0.003% FSR (K grade) - defines maximum deviation from ideal transfer curve; determines absolute accuracy in precision measurement. |
| Conversion Time | 35 μs typical to 14 bits - sets minimum sampling interval for real-time servo-control and ATE applications. |
| 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 without external scaling components. |
| Reference Voltage | Internal 6.3 V ±5% - eliminates need for external reference IC; temperature coefficient ±10 ppm/°C ensures stability over operating range. |
| Power Consumption | 645 mW typical (±15 V, +5 V supplies) - enables integration into thermally constrained industrial enclosures. |
| Digital Interface | TTL-compatible parallel outputs with STATUS flag and internal clock output - simplifies interface to legacy microcontrollers and FPGA logic without level-shifting. |
Pinout & Package
ADADC71JD is housed in a compact 32-pin hermetic ceramic DIP package with industry-standard pinout and dual ground separation (ANALOG COMMON Pin 22, DIGITAL COMMON Pin 19) requiring external single-point tie for noise control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–16 | BIT 1 (MSB) to BIT 16 (LSB) | Parallel TTL outputs; polarity and coding (CSB/COB/CTC) depend on input range and MSB inversion. |
| 17 | NC | No connect - must remain unconnected per datasheet; floating or tied to ground degrades performance. |
| 18 | STATUS | Active-high during conversion; falls low 40 ns after final bit decision - used as data-valid strobe. |
| 19 | DIGITAL COMMON | Digital ground return - must be externally tied to ANALOG COMMON (Pin 22) at single point near device. |
| 20 | CLOCK OUT | 400 kHz TTL clock output - synchronizes external logic or drives downstream timing circuits. |
| 21 | –15V DC SUPPLY (VEE) | Negative analog supply - requires local 1 μF + 0.1 μF decoupling to Pin 22 (ANALOG COMMON). |
| 22 | ANALOG COMMON | Analog ground return - separate from digital ground; critical for <1 LSB noise floor in precision measurements. |
| 23 | REF OUT (4.3V) | Internal reference buffer output - not used for ADADC71JD operation; pin is reserved and unused per Rev. C spec. |
| 24, 25 | +20V / +10V | Analog input voltage references - connected based on selected input range (e.g., Pin 24 for 0–20 V, Pin 25 for ±5 V). |
| 26 | BIPOLAR OFFSET | Offset adjustment node for bipolar ranges - highly noise-sensitive; requires guarding by ANALOG COMMON. |
| 27 | COMPARATOR IN | Internal comparator input - left open if no external trim; sensitive to noise; must be shorted to Pin 26 for ±2.5 V range. |
| 28 | +15V DC SUPPLY (VCC) | Positive analog supply - decoupled to Pin 22 with 1 μF + 0.1 μF capacitors. |
| 29 | GAIN ADJUST | External gain trim node - connected to 100 ppm/°C potentiometer across ±15 V for full-scale calibration. |
| 30 | +5V DC SUPPLY (VL) | Digital supply - decoupled to Pin 19 (DIGITAL COMMON); regulates internal logic and output drivers. |
| 31 | CONVERT COMMAND | Edge-triggered input - conversion starts on trailing edge of ≥50 ns pulse; initiates 17-clock cycle. |
| 32 | SHORT CYCLE | Resolution-select input - tied to specific bit output (e.g., Pin 11 for 10-bit) to terminate conversion early. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed thin-film resistors | Enable ±0.003% linearity and guaranteed no missing codes to 14 bits across 0°C to +70°C - critical for medical diagnostics where code dropout causes false alarms. |
| Configurable resolution via SHORT CYCLE | Supports 8–16 bit conversions with corresponding LSB values (e.g., 0.61 mV @ 14-bit ±10 V) - reduces latency in servo-loop feedback without sacrificing dynamic range. |
| Multiple output coding formats | CSB for unipolar, COB for bipolar, CTC via MSB inversion - eliminates external logic translation in mixed-signal industrial PLC I/O modules. |
| Integrated 400 kHz clock & STATUS flag | Removes need for external oscillator and handshake logic - simplifies BOM and PCB layout for ATE rack-mounted digitizers. |
| Hermetic ceramic DIP package | Provides long-term parameter stability and moisture resistance - required for embedded systems deployed in humid factory environments. |
Applications
| Medical Instrumentation | Precision Industrial Robotics |
|---|---|
Use Scenario: High-fidelity acquisition of EEG/ECG sensor outputs with sub-microvolt resolution and zero code dropout. IC Role / Device Role / Timing Role: Primary ADC in front-end signal chain; converts conditioned biopotential signals at ≤1 kSPS with <±1 LSB integral nonlinearity. Use Value: ±0.003% linearity and no missing codes ensure diagnostic-grade waveform fidelity - avoids misinterpretation of ST-segment anomalies in cardiac monitoring. | Use Scenario: Real-time joint torque feedback in collaborative robot arms using strain-gauge bridge outputs. IC Role / Device Role / Timing Role: Bipolar ADC interfacing to Wheatstone bridge amplifiers; configured for ±10 V range with COB coding. Use Value: 14-bit resolution with 1.22 mV LSB enables 0.01% full-scale torque measurement accuracy - meets ISO/TS 15066 safety compliance thresholds. |
| Automatic Test Equipment | Servo-Control Systems |
Use Scenario: Multi-channel voltage/current sourcing and measurement in semiconductor parametric testers. IC Role / Device Role / Timing Role: Digitizer channel in modular ATE mainframe; uses SHORT CYCLE (Pin 32 → Pin 14) for 13-bit, 46.5 μs conversions. Use Value: Configurable 13-bit mode achieves 21.5 kSPS throughput while retaining 0.012% FSR accuracy - balances speed and precision for production wafer sort testing. | Use Scenario: Position encoder interpolation and current loop sensing in CNC motion controllers. IC Role / Device Role / Timing Role: Dual-role ADC: unipolar 0–10 V for analog position feedback, bipolar ±5 V for motor phase current sensing. Use Value: Single-device support for both signal types eliminates dual-ADC layout complexity and inter-channel skew - improves closed-loop jitter below 50 ns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ | 14-bit, 1.6 μs conversion, serial SPI interface, no internal reference - requires external REF and clock. | Targeted at space-constrained portable instruments; lacks parallel bus and built-in reference needed for legacy ATE backplanes. | Select AD7892BRZ only when board area is critical and system already provides precision reference/clock; ADADC71JD preferred for drop-in replacement in existing DIP-based designs. |
| ADS8505IPFB | 16-bit, 1.6 μs conversion, parallel interface, internal reference, but uses CMOS process - higher power (1.2 W) and no short-cycle resolution scaling. | Optimized for high-speed data loggers; lacks laser-trimmed thin-film network - linearity limited to ±0.012% FSR, insufficient for metrology-grade calibration. | Choose ADS8505IPFB for throughput >500 kSPS; ADADC71JD remains superior for applications demanding <±0.003% linearity and thermal stability over 0–70°C. |
Compared with AD7892BRZ and ADS8505IPFB, ADADC71JD uniquely combines hermetic DIP packaging, laser-trimmed thin-film linearity, short-cycle resolution flexibility, and self-contained reference/clock - making it irreplaceable in legacy industrial and medical systems where reliability, long-term calibration stability, and pin-compatible upgrades are mandatory.
Availability
ADADC71JD is available at Aetrix Electronics and suitable for medical instrumentation, precision industrial robotics, and automatic test equipment requiring stable component supply across extended product lifecycles.
Supply support for ADADC71JD 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, headquartered in Norwood, MA.
The ADADC71JD belongs to Analog Devices' legacy high-precision hybrid ADC product line, engineered specifically for applications demanding metrology-grade accuracy, long-term stability, and compatibility with industrial control backplanes and medical safety-critical signal chains.
FAQ
What is the guaranteed linearity error specification for ADADC71JD?
The ADADC71JD has a guaranteed maximum linearity error of ±0.003% of full-scale range (FSR) at +25°C for K-grade devices, as specified in Rev. C datasheet Table 1. This value is measured across the full operating temperature range of 0°C to +70°C and is enabled by laser-trimmed thin-film resistor networks. The ADADC71JD maintains this accuracy without external calibration under nominal supply conditions (±15 V, +5 V).
Does ADADC71JD require an external reference voltage?
No, ADADC71JD does not require an external reference voltage. It integrates an internal 6.3 V reference with ±5% initial error and ±10 ppm/°C temperature coefficient. The REF OUT pin (Pin 23) is reserved and unused in ADADC71JD operation. All analog input scaling and conversion are referenced to this internal source, eliminating dependency on external reference ICs or trimming.
How is resolution reduced using the SHORT CYCLE function on ADADC71JD?
Resolution is reduced on ADADC71JD by connecting Pin 32 (SHORT CYCLE) to a specific bit output pin (e.g., Pin 11 for 10-bit mode). This terminates the SAR conversion after the designated bit decision, producing valid data with correspondingly larger LSB steps (e.g., 0.100% FSR for 10-bit). The conversion time drops to 35.6 μs max in 10-bit mode, as confirmed in Table 3 of the Rev. C datasheet.
What are the power supply requirements for ADADC71JD?
ADADC71JD requires three isolated supplies: ±15 V analog (VCC = Pin 28, VEE = Pin 21) and +5 V digital (VL = Pin 30). Supply tolerances are ±0.5 V for ±15 V and ±0.25 V for +5 V. Typical power consumption is 645 mW; decoupling mandates 1 μF + 0.1 μF capacitors placed adjacent to each supply pin, with analog supplies bypassed to ANALOG COMMON (Pin 22) and digital supply to DIGITAL COMMON (Pin 19).
Can ADADC71JD operate with bipolar and unipolar input ranges simultaneously?
No, ADADC71JD cannot operate with bipolar and unipolar input ranges simultaneously on a single device. Input range selection is hardwired via external connections to Pins 24–27 as defined in Table 4 of the Rev. C datasheet. However, the same ADADC71JD unit can be reconfigured between ranges (e.g., ±10 V or 0–10 V) by changing external jumper connections - enabling flexible test-system reuse without hardware redesign.
ADADC71JD 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:
- -
ADADC71JD FAQ
1.How can I place an order for ADADC71JD through Aetrix?
Please submit a Request for Quotation (RFQ) for ADADC71JD 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 ADADC71JD reliable?
The price and inventory of ADADC71JD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADADC71JD is usually 5 days.
3.What payment methods are accepted for ADADC71JD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADADC71JD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADADC71JD?
ADADC71JD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADADC71JD 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 ADADC71JD?
For technical support, including ADADC71JD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADADC71JD requirements.
6.How does Aetrix verify that ADADC71JD is sourced from the original manufacturer or authorized distributors?
All ADADC71JD 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 ADADC71JD meets industry standards.
7.What is the process for return or replacement of ADADC71JD?
All ADADC71JD units undergo pre-shipment inspection (PSI). If there is an issue with ADADC71JD, 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 ADADC71JD part is unused and in its original packaging.
Return procedure for ADADC71JD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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