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Analog Devices Inc. AD570JD
- Part No.:
- AD570JD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 18-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD570JD.pdf
- Description:
- IC ADC 8BIT SAR 18CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,039
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Product details
Overview
AD570JD from Analog Devices is an 8-bit monolithic successive-approximation analog-to-digital converter (ADC) with internal current-output DAC, buried Zener reference, and TTL-compatible digital interface. It operates from +5 V and –15 V supplies, delivers ±1/2 LSB relative accuracy over 0°C to +70°C, supports unipolar (0 V to +10 V) and bipolar (–5 V to +5 V) input ranges, and achieves 25 µs typical conversion time - used in precision data acquisition systems interfacing with microprocessors or multiplexed sensor arrays.
For engineers reviewing the AD570JD datasheet, AD570JD pinout, AD570JD application, or AD570JD equivalent, key selection considerations include its laser-trimmed 5 kΩ input resistor, open-collector DATA READY output, 3-state digital outputs, bipolar offset control via dedicated pin, and ceramic DIP-18 package with separate analog/digital commons for noise-sensitive industrial measurement designs.
Technical Context
The AD570JD implements a complete successive-approximation ADC using I²L logic and an internal 8-bit current-output DAC. Conversion is initiated by a low pulse on the BLANK & CONVERT (B&C) line, with DATA READY going low after ~25 µs to signal valid 8-bit parallel output. The buried Zener reference ensures stable full-scale calibration across temperature.
It features dual common terminals (analog and digital), supporting up to ±200 mV common-mode voltage between them. Bipolar operation is enabled by injecting MSB-equivalent offset current into the comparator summing node when the BIPOLAR OFFSET CONTROL pin is left open - yielding offset binary coding with –5 V to +5 V range and zero-code at –5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - defines smallest resolvable analog step as ~39.06 mV in 10 V full-scale unipolar mode |
| Relative Accuracy | ±6½ LSB - guarantees monotonicity and ≤0.20% total error over operating temperature |
| Conversion Time | 25 µs typical - enables up to 40 kSPS sampling without external sample-hold in moderate-speed applications |
| Analog Input Range | Unipolar: 0 V to +10 V; Bipolar: –5 V to +5 V - selectable via BIPOLAR OFFSET CONTROL pin state |
| Power Supplies | +5 V (V+) and –15 V (V–) - required for specified performance; V+ current = 7 mA, V– current = 9–15 mA |
| Digital Interface | TTL-compatible inputs; 3-state open-collector DATA READY; active-high/lower 8-bit parallel outputs |
| Reference Stability | Temperature-compensated buried Zener - eliminates need for external reference and reduces drift-induced calibration loss |
Pinout & Package
AD570JD is housed in an 18-lead side-brazed ceramic dual in-line package (SBDIP, D-18), measuring 0.960" × 0.290" with 0.100" lead pitch. The package provides hermetic sealing and thermal stability suitable for industrial environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PIN 1 | Digital Common | Reference ground for TTL logic inputs and outputs; must be isolated from analog common to minimize noise coupling |
| PIN 2–9 | BIT 1 (MSB) to BIT 8 (LSB) | Active-high parallel digital output lines - high-impedance (open) when BLANK & CONVERT is high |
| PIN 10 | DATA READY (DR) | Open-collector output; pulled low after conversion completion to signal valid data availability |
| PIN 11 | BIPOLAR OFFSET CONTROL | Controls input range mode: grounded = unipolar (0 V to +10 V); open = bipolar (–5 V to +5 V) |
| PIN 12 | ANALOG COMMON | Return path for analog input current; carries transient up to 2 mA during conversion - requires separate low-noise routing |
| PIN 13 | ANALOG IN | Differential input node referenced to ANALOG COMMON; accepts ±15 V absolute max, impedance = 5.0 kΩ typical |
| PIN 14 | V– | Negative supply rail (–12 V to –16.5 V); powers internal DAC and comparator circuitry |
| PIN 15 | V+ | Positive supply rail (+4.5 V to +7.0 V); powers logic and reference sections |
| PIN 16 | BLANK & CONVERT (B&C) | Active-low initiation signal - low pulse ≥2 µs starts conversion; high pulse clears outputs and resets SAR |
| PIN 17 | Not Connected | No internal connection - must remain unconnected to avoid damage per datasheet warning |
| PIN 18 | Not Connected | No internal connection - must remain unconnected to avoid damage per datasheet warning |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed 5 kΩ input resistor | Enables precise full-scale matching to internal DAC; allows fine calibration via external series trimmer (e.g., 200 Ω potentiometer) |
| Separate analog and digital commons | Permits independent grounding strategies - supports ±200 mV common-mode voltage, reducing system-level noise coupling |
| Buried Zener voltage reference | Provides inherent temperature stability and long-term drift performance without requiring external reference components |
| 3-state digital outputs with open-collector DATA READY | Allows direct multiplexing of multiple AD570JD units on shared data bus; simplifies µP interface using PIA or discrete logic |
| Configurable unipolar/bipolar input range | Single-pin control (BIPOLAR OFFSET CONTROL) selects between 0 V–10 V or ±5 V input ranges - no external switching components needed |
Applications
| Industrial Process Monitoring | Multiplexed Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA loop transmitters, thermocouple signals, and pressure sensors in PLC-based control cabinets. IC Role / Device Role / Timing Role: Standalone 8-bit ADC digitizing analog field signals with minimal external components; uses BLANK & CONVERT for synchronized sampling across multiple channels. Use Value: Eliminates need for external reference or op-amp buffers; 25 µs conversion time supports >30 kSPS aggregate throughput in multi-channel configurations. | Use Scenario: Simultaneous sampling of 8–10 temperature, voltage, and current sensors in environmental test chambers or power supply diagnostics. IC Role / Device Role / Timing Role: One of several AD570JD units sharing a single 8-bit data bus under PIA or µP control; DATA READY wire-OR enables status polling without dedicated interrupt lines. Use Value: Reduces board space and component count vs. serial ADC solutions; ceramic DIP-18 package ensures reliability in thermally cycling industrial enclosures. |
| Microprocessor-Based Instrumentation | Calibration-Grade Test Equipment |
Use Scenario: Embedded data logger in portable multimeters or handheld oscilloscopes requiring local analog digitization and µP-controlled sequencing. IC Role / Device Role / Timing Role: ADC interfaced directly to 8080/6800-family buses using three-state buffers and self-timed B&C pulses; DR signal synchronizes read cycles. Use Value: Self-contained timing eliminates external clock generators; TTL compatibility avoids level-shifting circuitry and simplifies firmware integration. | Use Scenario: Front-end digitizer in benchtop DMMs or automated calibration systems where traceable accuracy and repeatability are critical. IC Role / Device Role / Timing Role: Precision ADC leveraging laser-trimmed input resistor and buried Zener reference to maintain ±0.20% linearity over 0°C to +70°C without recalibration. Use Value: Full-scale calibration error held to ±2 LSB (±0.8%) with simple 15 Ω series resistor; optional 200 Ω trimmer achieves <±0.1% accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit successive-approximation ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD571JN | 10-bit resolution, same DIP-18 package, higher relative accuracy (±0.5 LSB), requires external reference | Used where higher resolution is mandatory and external reference design overhead is acceptable | Select AD571JN only if 10-bit precision is required and system can accommodate external reference layout and calibration |
| MAX160BCNG | 8-bit, CMOS process, +5 V single supply, 35 µs conversion time, no bipolar mode support | Suitable for low-power, single-supply embedded systems where bipolar input is unnecessary | Choose MAX160BCNG for battery-powered or space-constrained designs needing simplified power architecture but sacrificing bipolar capability |
Compared with AD570JD, AD571JN offers two extra bits and tighter accuracy but demands external reference design effort, while MAX160BCNG reduces supply complexity and footprint at the cost of missing bipolar operation and slower conversion - making AD570JD optimal for industrial dual-supply systems requiring flexible input range and proven hermetic reliability.
Availability
AD570JD is available at Aetrix Electronics and suitable for industrial process monitoring, multiplexed sensor data acquisition, and microprocessor-based instrumentation requiring stable component supply, long-lifecycle support, and MIL-grade packaging heritage.
Supply support for AD570JD 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 company specializing in high-performance analog, mixed-signal, and digital signal processing ICs for precision measurement and control.
The AD570JD belongs to Analog Devices' legacy precision ADC product line, designed specifically for industrial and military applications demanding robustness, wide temperature operation, and minimal external component count in standalone A/D conversion tasks.
FAQ
What is the operating temperature range for the AD570JD?
The AD570JD is rated for operation from 0°C to +70°C. This commercial-grade temperature specification is defined in the Ordering Guide and confirmed in the Absolute Maximum Ratings table. Unlike the AD570SD variant, the AD570JD does not support extended military temperature ranges. Its performance parameters - including relative accuracy, conversion time, and power supply rejection - are guaranteed within this range per the published specifications.
Does the AD570JD require an external reference voltage?
No, the AD570JD does not require an external reference voltage. It integrates a temperature-compensated buried Zener reference that serves as the primary voltage reference for the internal DAC and comparator. This eliminates the need for external reference components and associated trimming circuitry, simplifying board layout and improving long-term stability. All specifications for full-scale calibration, offset, and linearity assume use of this internal reference.
How is bipolar input range configured on the AD570JD?
Bipolar input range (–5 V to +5 V) on the AD570JD is configured by leaving the BIPOLAR OFFSET CONTROL pin (Pin 11) unconnected (open). When grounded, the device operates in unipolar mode (0 V to +10 V). The datasheet explicitly states that an open pin injects MSB-equivalent offset current into the comparator summing node, shifting the transfer function to produce offset binary coding - where –5 V maps to 00000000 and +4.96 V maps to 11111111.
What is the purpose of Pins 17 and 18 on the AD570JD?
Pins 17 and 18 on the AD570JD are internally unconnected (NC) and must remain unconnected in the circuit. The datasheet warns that connecting TTL logic inputs to these pins - or any unintended connection - may cause device damage. These pins exist for mechanical symmetry and package standardization but carry no electrical function. Proper handling requires leaving both pins floating with no solder mask bridging or PCB trace attachment.
Can the AD570JD be used with a single +5 V supply?
No, the AD570JD cannot be operated with only a +5 V supply. It requires dual supplies: +5 V (V+, Pin 15) and –12 V to –16.5 V (V–, Pin 14) for proper functionality. The internal DAC, comparator, and reference circuitry depend on the negative rail to establish correct bias points and full-scale current balance. Attempting operation with only +5 V will result in failure to convert or catastrophic malfunction, as confirmed by the Absolute Maximum Ratings and Power Supply Selection section.
AD570JD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 18-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 8
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- +4.5V ~ 7V, -12V ~ 16.5V
- Voltage - Supply, Digital:
- +4.5V ~ 7V, -12V ~ 16.5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 18-SBDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD570JD FAQ
1.How can I place an order for AD570JD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD570JD 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 AD570JD reliable?
The price and inventory of AD570JD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD570JD is usually 5 days.
3.What payment methods are accepted for AD570JD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD570JD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD570JD?
AD570JD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD570JD 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 AD570JD?
For technical support, including AD570JD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD570JD requirements.
6.How does Aetrix verify that AD570JD is sourced from the original manufacturer or authorized distributors?
All AD570JD 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 AD570JD meets industry standards.
7.What is the process for return or replacement of AD570JD?
All AD570JD units undergo pre-shipment inspection (PSI). If there is an issue with AD570JD, 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 AD570JD part is unused and in its original packaging.
Return procedure for AD570JD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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