Analog Devices Inc. AD573JNZ

Overview

AD573JNZ from Analog Devices is a complete 10-bit successive approximation analog-to-digital converter (ADC) with integrated buried Zener reference, internal clock, comparator, and SAR logic. It delivers ±1 LSB relative accuracy, 20 µs typical conversion time, and supports both unipolar (0 V to +10 V) and bipolar (–5 V to +5 V) input ranges. It is used in precision data acquisition systems requiring self-contained, low-component-count ADC functionality.

For engineers reviewing the AD573JNZ datasheet, AD573JNZ pinout, AD573JNZ application, or AD573JNZ equivalent, key selection considerations include its dual-supply operation (+5 V / –12 V to –15 V), 20-pin PDIP package, 10-bit left-justified output format, and microprocessor bus interface compatibility without external buffers.

Technical Context

The AD573JNZ implements successive approximation using integrated injection logic (I2L) SAR architecture, paired with a laser-trimmed SiCr thin-film resistor ladder and temperature-compensated subsurface Zener reference. Its DAC core is current-output-based and matched to a 5 kΩ input resistor for full-scale current alignment.

Conversion is initiated by a trailing-edge-triggered CONVERT pulse; DATA READY (DR) signals completion after ≤30 µs. Output data is partitioned into high byte (DB9–DB2) and low byte (DB1–DB0), enabled separately via HBE and LBE, supporting 8-bit bus interfacing with overlapping byte reads.

Key Specifications

Pinout & Package

The AD573JNZ is housed in a 20-pin plastic dual in-line package (PDIP), compliant with JEDEC standard N-20, with 0.300-inch body width and 0.100-inch lead pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 10-bit ADC applications.

Compared with AD573JNZ, AD7572A offers higher resolution but demands external reference and more power, while MAX1112 provides serial simplicity and single-supply convenience at the expense of parallel bus compatibility and direct replacement feasibility.

Availability

AD573JNZ is available at Aetrix Electronics and suitable for industrial process monitoring, test equipment, legacy microprocessor interfaces, and bipolar signal acquisition requiring stable component supply and long-term obsolescence management.

Supply support for AD573JNZ 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, founded in 1965 and headquartered in Wilmington, MA.

The AD573JNZ belongs to Analog Devices' legacy precision ADC product line, designed specifically for industrial and instrumentation applications demanding monolithic integration, proven reliability, and compatibility with classic microprocessor architectures.

FAQ

What is the maximum conversion rate supported by the AD573JNZ?

The AD573JNZ has a maximum conversion time of 30 µs over its full operating temperature range (0°C to +70°C), enabling a theoretical maximum throughput of approximately 33 kSPS. However, real-world sustained rates depend on system-level timing margins, including setup/hold for HBE/LBE enable and DR assertion delay. The AD573JNZ datasheet specifies tC = 10–30 µs, with 20 µs typical at +25°C.

Does the AD573JNZ require external components to operate as a complete ADC?

No, the AD573JNZ does not require external components to perform a full-accuracy 10-bit conversion. It integrates a buried Zener reference, internal clock, comparator, 10-bit current-output DAC, successive approximation register, and three-state output buffers on a single die. Only power supplies (+5 V and –12 V to –15 V), analog input, and a CONVERT pulse are needed for basic operation.

How is bipolar input range configured on the AD573JNZ?

The AD573JNZ achieves bipolar (–5 V to +5 V) input range by leaving Pin 16 (BIPOLAR OFFSET CONTROL) unconnected (open). In contrast, grounding Pin 16 to DIGITAL COMMON selects the unipolar 0 V to +10 V range. This configuration alters the output coding to positive true offset binary and shifts the transfer curve so that 0 V input yields code 1000000000 (512 decimal).

What are the logic voltage thresholds for the AD573JNZ digital inputs?

The AD573JNZ digital inputs (CONVERT, HBE, LBE) have guaranteed logic thresholds of V_IL ≤ 0.8 V and V_IH ≥ 2.0 V, compatible with standard TTL and LS-TTL logic families. Input current is specified at ±100 µA across temperature. These thresholds ensure robust noise immunity and direct interfacing with 5 V microprocessor control lines without level-shifting.

Can the AD573JNZ output data be read as a single 10-bit word?

Yes, the AD573JNZ can output all 10 bits simultaneously by tying HBE and LBE together and driving them low-this enables DB9–DB2 and DB1–DB0 concurrently. The resulting 10-bit word is left-justified (DB9–DB0), allowing placement at the high end of a 16-bit bus. Alternatively, it supports split-byte reads: HBE low for DB9–DB2 (upper 8 bits), LBE low for DB1–DB0 (lower 2 bits), with unused bits masked in software.