AD974ANZ - 4-Ch 16-Bit 200 kSPS ADC | Analog Devices
MPN: AD974ANZ ✓ ActiveAD974ANZ Overview
An ADC is an analog-to-digital converter that samples continuous voltage signals and converts them into numeric values for measurement or processing. The AD974 belongs to the data acquisition system and ADC hierarchy, combining a four-channel input multiplexer, a 16-bit sampling converter, an internal reference, and a serial digital interface in one package. Its multiplexed architecture is intended for instrumentation and industrial systems that require compact multi-channel data acquisition.
Key features include 16-bit resolution, 200 kSPS aggregate throughput, four single-ended input channels, and operation from one 5 V supply. A power-down function can reduce consumption from a maximum of 100 mW in the datasheet description to a typical 50 μW when the PWRD pin is asserted. The available input ranges cover unipolar 0–4 V and 0–5 V signals as well as bipolar ±10 V signals, reducing the need for separate front-end scaling circuits for different signal classes.
The internal architecture uses a four-channel input multiplexer followed by a high-speed, 16-bit, successive-approximation, switched-capacitor ADC. A 2.5 V internal reference supports repeatable conversion measurements, while the serial interface provides a compact connection to a controller, DSP, or embedded data-acquisition system. The converter is designed for low-power single-supply operation and accommodates both analog and reference power-down control.
Typical applications include industrial process monitoring, laboratory instrumentation, multichannel sensor acquisition, factory automation, embedded measurement systems, and compact data loggers. In each case, the four-channel multiplexer reduces the number of external analog front ends, while 200 kSPS throughput supports periodic sampling of multiple analog quantities. Systems requiring continuous simultaneous sampling rather than multiplexed acquisition need a different converter architecture.
The primary design consideration is the input and reference behavior. Designers must select the correct input range, account for the maximum 120 mW power dissipation listed in the available part data, and provide suitable bypassing for the single 5 V supply. Signal conditioning may also be required to keep source impedance and voltages within the AD974 input limits.
This product page consolidates the verified manufacturer specifications, distributor package information, power characteristics, and honest drop-in replacement findings. It also distinguishes verified equivalents from unsupported package variants so engineers can make a PCB-safe sourcing decision.
Drop-in alternatives for AD974ANZ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with AD974ANZ (same form factor and footprint) — differing in Package, Product Type, Supply Voltage, Mounting Type, Input Multiplexer.
AD974AN
✅ Drop-InContact for price
View Datasheet →AD974BNZ
✅ Drop-InContact for price
View Datasheet →AD974ANZ Maximum Ratings & Electrical Characteristics
| Product Type | Data acquisition system with ADC |
| ADC Resolution | 16 bit |
| Sampling Rate | 200 kSPS |
| Input Channels | 4 single-ended channels |
| Input Multiplexer | 4-channel analog input multiplexer |
| ADC Architecture | Successive-approximation switched-capacitor ADC |
| Analog Input Ranges | 0 V to +4 V, 0 V to +5 V, or ±10 V |
| Supply Voltage | 5 V |
| Minimum Supply Voltage | 4.75 V |
| Maximum Supply Voltage | 5.25 V |
| Internal Reference Voltage | +2.5 V |
| Digital Interface | Serial interface |
| Maximum Power Dissipation | 120 mW |
| Power-Down Typical Power | 50 μW |
| Active Power Consumption | 100 mW maximum |
| Package | 28-PDIP, 0.600 in (15.24 mm) |
| Mounting Type | Through-hole |
| Lead-Free Status | Lead-free |
| RoHS Status | RoHS compliant |
AD974ANZ 28-pdip, 0.600 in (15.24 mm) Pin Configuration Guide
Pin configuration for AD974ANZ (28-pdip, 0.600 in (15.24 mm) package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for AD974ANZ.
Refer to the datasheet for full pin configuration.
Typical Applications
AD974ANZ is suitable for 6 applications: Industrial Process Monitoring, Laboratory Data Acquisition, Factory Automation Controllers, Multichannel Sensor Acquisition, Embedded Measurement Systems, Compact Data Loggers.
Industrial Process Monitoring
The AD974ANZ fits industrial process monitoring where several analog sensors must be scanned by one acquisition channel. Its four single-ended inputs reduce repeated front-end circuitry, while 16-bit resolution and 200 kSPS throughput support periodic pressure, level, or temperature measurements. The device accepts 0–4 V, 0–5 V, or ±10 V signals from suitable conditioners and operates from one 5 V supply. Because the channels are multiplexed rather than simultaneous, applications requiring coincident waveform capture need another converter architecture.
Recommended
Laboratory Data Acquisition
The AD974ANZ is appropriate for compact laboratory data-acquisition equipment requiring multiple channels and 16-bit measurement resolution. The four-channel multiplexer allows instrument designers to use one converter for several analog inputs, and the internal 2.5 V reference supports a self-contained measurement chain. With a serial interface and 200 kSPS throughput, the part can serve automated bench systems, though its multiplexed sampling architecture is better suited to periodic measurements than simultaneous phase-sensitive acquisition.
Recommended
Factory Automation Controllers
The AD974ANZ supports factory automation and embedded control systems that monitor several analog process points. Its 4.75–5.25 V operating range simplifies use with conventional 5 V control electronics, while the selectable 0–4 V, 0–5 V, or ±10 V input ranges accommodate different transducer outputs after conditioning. The PWRD control is useful during inactive intervals because the manufacturer datasheet reports a typical 50 μW power-down consumption.
Recommended
Multichannel Sensor Acquisition
The AD974ANZ is suitable for multichannel sensor acquisition in equipment that must monitor more than one physical variable. Its four single-ended inputs reduce the number of ADC front ends, and 16-bit conversion resolution supports detailed measurements when the selected 200 kSPS aggregate rate meets the application's sampling requirement. The internal 2.5 V reference simplifies instrumentation, but source impedance and anti-alias filtering must be designed around the datasheet input specifications.
Recommended
Embedded Measurement Systems
The AD974ANZ provides a compact acquisition front end for embedded measurement systems using 5 V electronics. Four multiplexed single-ended channels, a serial data interface, and a 2.5 V internal reference allow a controller to acquire multiple conditioned analog inputs without a separate reference circuit. The 28-PDIP package favors leaded industrial hardware and prototypes, while the lack of simultaneous sampling makes the device less appropriate for vibration, phase, or waveform systems that require correlated channel measurements.
Recommended
Compact Data Loggers
The AD974ANZ can serve as the analog acquisition element in a compact data logger for slow or periodic analog signals. Four input channels reduce connector count, the 16-bit resolution preserves measurement detail, and the serial interface allows sampled data to be transferred to an embedded controller. Its 200 kSPS capability provides ample margin for many environmental and industrial logging tasks, although the operating-temperature range is not stated in the supplied data and must be checked before field deployment.
Recommended
Recommended Products Summary
Engineering reference data for AD974ANZ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD974AN | AD974BNZ |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 28-PDIP | 28-PDIP | 28-PDIP |
| Resolution | 16 bit | 16 bit | 16 bit |
| Sampling Rate | 200 kSPS | 200 kSPS | 200 kSPS |
| Input Channels | 4 single-ended channels | 4 channels | 4 channels |
| Supply Voltage | 4.75 V to 5.25 V | 4.75 V to 5.25 V | 4.75 V to 5.25 V |
| Internal Reference | 2.5 V | 2.5 V | 2.5 V |
| Digital Interface | Serial | Serial | Serial |
| Analog Input Ranges | 0–4 V, 0–5 V, or ±10 V | 0–4 V, 0–5 V, or ±10 V | 0–4 V, 0–5 V, or ±10 V |
| Power-Down Typical Power | 50 μW | 50 μW | 50 μW |
Key Differentiators
- Verified near-identical ordering-code alternative (vs AD974AN)
- Four-channel acquisition without four external ADCs (vs AD974BNZ)
- Selectable unipolar and bipolar input ranges (vs AD974AN)
- Low-power shutdown for intermittent acquisition (vs AD974BNZ)
Design Notes
Use a single 5 V supply within the verified 4.75–5.25 V operating range and place the supply bypass capacitors close to the appropriate power and ground pins. The manufacturer datasheet describes analog and reference power-down through PWRD; asserting it reduces typical consumption to 50 μW. Do not assume that powering down the converter allows its input pins to accept signals outside the selected range.
Route analog input traces away from the serial data lines and digital return currents, and keep the input network close to the converter. Because the AD974 multiplexes four channels, unequal settling times can create channel-dependent errors when the source impedance is high. Follow the manufacturer's input-conditioning and layout guidance, and verify settling at the 200 kSPS aggregate sampling rate.
The four inputs are multiplexed and are not sampled simultaneously. Do not use AD974ANZ for phase-sensitive, vibration, or other applications that require coincident acquisition unless the system has been validated for the resulting time skew. Also confirm the selected 0–4 V, 0–5 V, or ±10 V range against the source amplitude before applying external signals.
The available distributor data lists maximum power dissipation as 120 mW, while the manufacturer datasheet describes a maximum active power consumption of 100 mW under specified conditions. Treat 120 mW as the thermal design limit until confirmed against the exact datasheet table and test conditions. Provide adequate PCB copper and verify the ambient and junction-temperature requirements for the intended enclosure.
Compliance Information
The supplied DigChip part data identifies AD974ANZ as lead-free and RoHS compliant. REACH, halogen-free, conflict-minerals, and automotive qualification information were not supplied.
