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Analog Devices Inc. AD573KD
- Part No.:
- AD573KD
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD573KD.pdf
- Description:
- IC ADC 10BIT SAR 20CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,060
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Product details
Overview
AD573KD from Analog Devices is a complete 10-bit successive approximation analog-to-digital converter (ADC) with integrated buried Zener reference, comparator, clock, DAC, and SAR - all on a single monolithic IC. It delivers ±1/2 LSB relative accuracy, 20 µs typical conversion time, and supports unipolar (0 V to +10 V) or bipolar (–5 V to +5 V) input ranges using a single pin configuration. It is used in precision data acquisition systems requiring stable, self-contained A/D conversion without external components.
For engineers reviewing the AD573KD datasheet, AD573KD pinout, AD573KD application, or AD573KD equivalent, key selection considerations include its guaranteed no-missing-codes performance across 0°C to +70°C, dual-supply operation (+5 V / –12 V to –15 V), 20-pin hermetically sealed ceramic DIP package, and compatibility with 8-bit microprocessor buses via HBE/LBE byte-enable control.
Technical Context
The AD573KD implements successive approximation using integrated injection logic (I2L) and a laser-trimmed SiCr thin-film resistor ladder for high linearity. Its temperature-compensated subsurface Zener reference ensures stable full-scale and offset performance over temperature.
Conversion is initiated by a 500 ns minimum positive CONVERT pulse; DR goes high within 1.5 µs after the rising edge (logic reset), then low upon completion (~20 µs). Data is output left-justified: DB9–DB2 (8 MSBs) enabled by HBE, DB1–DB0 (2 LSBs) enabled by LBE - supporting both 8-bit bus interfacing and full 10-bit readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10 bits - defines smallest resolvable analog step as ~9.766 mV in 0–10 V range. |
| Relative Accuracy | ±1/2 LSB - guarantees monotonic transfer function and no missing codes at 25°C. |
| Conversion Time | 20 µs typ - enables up to 50 kSPS sampling in burst mode with proper timing control. |
| Analog Input Range | 0 V to +10 V (unipolar) or –5 V to +5 V (bipolar) - selected by grounding or floating Pin 16 (BIP OFF). |
| Supply Voltages | +5 V (V+) and –12 V to –15 V (V–) - powers internal DAC, reference, and comparator with specified linearity. |
| Output Coding | Positive true binary (unipolar); positive true offset binary (bipolar) - matches standard microprocessor interpretation. |
| Power Dissipation | ~24 mA total (15 mA on V+, 9 mA on V–) - determines thermal design margin in sealed enclosures. |
Pinout & Package
The AD573KD is housed in a 20-pin hermetically sealed ceramic dual in-line package (SBDIP, JEDEC MO-001 compliant, package code D-20), rated for 0°C to +70°C operation and suitable for high-reliability industrial and aerospace applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (DB0) | LSB digital output | Lowest significant bit of 10-bit result; enabled only when LBE is low. |
| Pin 2 (DB1) | 2nd LSB digital output | Second lowest bit; forms 2-bit low byte with DB0 under LBE control. |
| Pin 3–10 (DB2–DB9) | MSB digital outputs | Bits 2 through 9 (DB2 = 22, DB9 = 29); enabled only when HBE is low. |
| Pin 11 (V–) | Negative supply rail | Connects to –12 V or –15 V; powers internal DAC current sources and comparator. |
| Pin 12 (ANALOG COM) | Analog ground reference | Carries ~2 mA static current post-conversion; must be isolated from digital common per layout guidelines. |
| Pin 13 (ANALOG IN) | Differential analog input | Accepts 0–10 V (unipolar) or –5–+5 V (bipolar); input impedance 5 kΩ nominal. |
| Pin 14 (CONVERT) | Asynchronous start trigger | Positive pulse ≥500 ns initiates conversion; falling edge starts SAR cycle. |
| Pin 15 (DR) | Data Ready status flag | Open-collector output; goes low ~20 µs after CONVERT falling edge to signal valid data. |
| Pin 16 (BIP OFF) | Bipolar offset control | Grounded → unipolar mode; open → bipolar mode; not TTL-compatible directly. |
| Pin 17 (DIG COM) | Digital ground reference | Reference for all logic inputs/outputs; may differ from ANALOG COM by up to ±200 mV. |
| Pin 18 (LBE) | Low-byte enable | Active-low control for DB0–DB1; must be high during conversion to avoid bus conflict. |
| Pin 19 (HBE) | High-byte enable | Active-low control for DB2–DB9; same timing constraints as LBE. |
| Pin 20 (V+) | Positive supply rail | +5 V supply for logic circuitry, SAR, and output buffers. |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic 10-bit ADC with reference | Eliminates need for external voltage reference, clock generator, or comparator - reduces BOM count and layout complexity. |
| No missing codes over temperature | Guaranteed monotonicity from 0°C to +70°C ensures reliable measurement integrity in varying environmental conditions. |
| Configurable unipolar/bipolar input | Single-pin (Pin 16) selection enables flexible signal conditioning without hardware changes or additional components. |
| Microprocessor bus interface | HBE/LBE byte-enable architecture allows seamless integration with 8-bit systems (e.g., 6502, 8085) without glue logic or bus transceivers. |
| Fast 20 µs conversion | Enables real-time sampling in closed-loop control, instrumentation, and automated test equipment where latency matters. |
Applications
| Industrial Process Monitoring | Test & Measurement Equipment |
|---|---|
Use Scenario: Continuous monitoring of 4–20 mA loop signals converted to 0–10 V via precision shunt in PLC I/O modules. IC Role / Device Role / Timing Role: Primary A/D converter digitizing analog sensor outputs with guaranteed monotonicity and ±1/2 LSB accuracy. Use Value: Enables detection of sub-10 mV drift in pressure or temperature transducers without calibration-induced errors. | Use Scenario: Digitizing calibrated reference voltages in benchtop multimeters and calibration standards. IC Role / Device Role / Timing Role: High-stability ADC core referenced to buried Zener; operates with minimal external support components. Use Value: Maintains traceable accuracy over time and temperature without periodic recalibration of the converter itself. |
| Aerospace Sensor Interfaces | Legacy Microprocessor Systems |
Use Scenario: Converting strain gauge or thermocouple outputs in avionics subsystems operating across wide thermal ranges. IC Role / Device Role / Timing Role: Hermetic ceramic-packaged ADC providing radiation-tolerant, long-life performance in flight-critical signal chains. Use Value: Eliminates need for external trimming or compensation networks due to laser-trimmed resistor ladder and Zener reference. | Use Scenario: Upgrading analog front-ends in vintage 8-bit embedded controllers (e.g., Apple II, industrial 6502-based systems). IC Role / Device Role / Timing Role: Drop-in compatible ADC with memory-mapped I/O support and native 8-bit bus timing alignment. Use Value: Preserves existing firmware and PCB layout while adding 10-bit resolution and eliminating discrete component dependencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD573JN | Same electrical specs but in plastic DIP (N-20); lower cost, non-hermetic, rated 0°C to +70°C. | Suitable for commercial-grade instrumentation where moisture resistance and long-term stability are less critical. | Select AD573JN for cost-sensitive, non-military applications with benign environments. |
| AD573SD | Extended temperature grade (–55°C to +125°C); same ceramic DIP package; ±1 LSB relative accuracy (vs. ±1/2 LSB for AD573KD). | Required for extended-range aerospace, downhole, or military platforms where operational extremes exceed +70°C. | Choose AD573SD when full military-temperature operation is mandatory and ±1 LSB accuracy is acceptable. |
Compared with AD573JN, the AD573KD offers superior long-term stability and hermetic reliability in harsh environments; compared with AD573SD, it trades extended temperature range for tighter ±1/2 LSB accuracy at lower cost and power in commercial industrial use.
Availability
AD573KD is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement equipment, aerospace sensor interfaces, and legacy microprocessor systems requiring stable component supply with guaranteed 0°C to +70°C performance and hermetic packaging.
Supply support for AD573KD 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, automotive, communications, and defense markets.
The AD573 series was designed as a self-contained, monolithic 10-bit ADC solution for applications demanding guaranteed no-missing-codes performance, minimal external components, and robust operation across commercial and extended temperature ranges.
FAQ
What is the guaranteed relative accuracy of the AD573KD over its full operating temperature range?
The AD573KD guarantees ±1/2 LSB relative accuracy at +25°C and maintains no-missing-codes performance from 0°C to +70°C. While full ±1/2 LSB accuracy is specified at 25°C, monotonicity and absence of missing codes are ensured across the entire temperature range - critical for closed-loop control and metrology applications where code transitions must remain strictly ordered.
Can the AD573KD operate with a –12 V negative supply, or does it require –15 V?
The AD573KD is fully specified and tested for operation with either –12 V or –15 V on V–, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. Performance parameters including full-scale calibration error (±2 LSB), differential nonlinearity (10 bits), and conversion time (10–30 µs) are guaranteed across –12 V to –15 V, making –12 V a valid and commonly used supply voltage in industrial designs.
How is bipolar input range (–5 V to +5 V) configured on the AD573KD?
The AD573KD achieves bipolar input range by leaving Pin 16 (BIP OFF) unconnected (open). This enables injection of a precise offset current into the comparator summing node, shifting the transfer function so that –5 V maps to 0000000000, 0 V maps to 1000000000, and +4.99 V maps to 1111111111 - all in offset binary coding. No external components are required beyond correct supply and grounding.
Does the AD573KD support right-justified 10-bit output format?
No, the AD573KD outputs data exclusively in left-justified format: DB9–DB2 (8 MSBs) appear on Pins 10–3 when HBE is low, and DB1–DB0 (2 LSBs) appear on Pins 2–1 when LBE is low. The datasheet explicitly states "it is not possible to reconfigure the AD573 for right justified data," and no internal register or pin-strapping option enables right justification.
What is the role of the 5 kΩ thin-film input resistor in the AD573KD's signal path?
The 5 kΩ thin-film input resistor is laser-trimmed to match the internal DAC's full-scale current. When a 9.990 V (10 V – 1 LSB) input is applied, it generates an input current that precisely balances the DAC output with all bits on - enabling accurate full-scale calibration. Its value is fundamental to the device's absolute accuracy and is not user-replaceable.
AD573KD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 10
- 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:
- 20-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD573KD FAQ
1.How can I place an order for AD573KD through Aetrix?
Please submit a Request for Quotation (RFQ) for AD573KD 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 AD573KD reliable?
The price and inventory of AD573KD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD573KD is usually 5 days.
3.What payment methods are accepted for AD573KD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD573KD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD573KD?
AD573KD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD573KD 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 AD573KD?
For technical support, including AD573KD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD573KD requirements.
6.How does Aetrix verify that AD573KD is sourced from the original manufacturer or authorized distributors?
All AD573KD 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 AD573KD meets industry standards.
7.What is the process for return or replacement of AD573KD?
All AD573KD units undergo pre-shipment inspection (PSI). If there is an issue with AD573KD, 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 AD573KD part is unused and in its original packaging.
Return procedure for AD573KD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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