AD775JN - 8-Bit 20 MSPS Low-Power ADC | Analog Devices
MPN: AD775JN ✓ ActiveAD775JN Overview
An ADC is a data-acquisition semiconductor that converts an analog voltage into a digital code. The AD775 belongs to the sampling ADC hierarchy, where its internal sample-and-hold function captures an input before the conversion stages perform successive approximation to an 8-bit result. This combination supports high-speed signal acquisition without requiring a separate sample-and-hold circuit.
Principal features include CMOS operation, 8-bit resolution, 20 MSPS throughput, and single-supply operation from +5 V. The converter also provides three-state outputs, differential nonlinearity of 0.3 LSB, differential gain of 1%, and differential phase of 0.5 degrees. Its integrated sampling function and reference bias resistors simplify the external signal-conditioning circuit and reduce the number of required components.
Internally, the pipelined ping-pong two-step flash architecture alternates between conversion stages to achieve sampling rates up to 35 MHz while maintaining low power consumption. Differential conversion provides useful rejection of common-mode voltage, while differential gain and phase specifications characterize how analog amplitude and timing errors are transferred into the digital output. The converter is therefore suited to precision acquisition systems that require moderate resolution and high sampling throughput.
Typical applications include industrial process measurement, waveform capture, communications equipment, instrumentation, and digital control loops. In each case, the 20 MSPS rate can capture rapidly changing waveforms, while the 8-bit output can be transferred directly into a digital system or reconstructed through interpolation. External anti-alias filtering, source impedance matching, and careful grounding remain necessary to preserve the stated converter performance.
When designing a circuit around the AD775JN, follow the datasheet reference and pin descriptions when assigning analog and digital connections. Keep the analog input path short, provide stable bypass capacitance at the supply pins, and route digital transitions away from the input and reference network. Because the converter is a through-hole DIP device, its larger package also requires adequate spacing and mechanical clearance in legacy or industrial control boards.
This product record combines the manufacturer's converter description, exact AD775JN package information, technical characteristics, application guidance, and verified sourcing context. It helps engineers evaluate whether the AD775JN's 8-bit resolution, 20 MSPS sampling rate, low 60 mW power dissipation, and 24-pin PDIP package fit a legacy high-speed acquisition design without requiring a board redesign.
Drop-in alternatives for AD775JN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesAD775JN Maximum Ratings & Electrical Characteristics
| Converter Type | 8-bit sampling analog-to-digital converter |
| Resolution | 8 bit |
| Sampling Rate | 20 MSPS |
| Maximum Internal Sampling Rate | 35 MHz |
| Power Dissipation | 60 mW |
| Supply Voltage | +5 V single supply |
| Process Technology | CMOS |
| Architecture | Pipelined ping-pong two-step flash |
| Input Count | 1 input |
| Differential Nonlinearity | 0.3 LSB |
| Differential Gain | 1% |
| Differential Phase | 0.5 degrees |
| Output Type | Three-state outputs |
| Sampling Function | Built-in sample-and-hold function |
| Reference Bias Resistors | On-chip |
| Package | 24-pin PDIP, through-hole |
| Package Width | 0.400 in (10.16 mm) |
| Mounting Type | Through-hole |
| Temperature Grade | Commercial extended |
AD775JN 0.400 in (10.16 mm) Pin Configuration Guide
Pin configuration for AD775JN (0.400 in (10.16 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 AD775JN.
Refer to the datasheet for full pin configuration.
Typical Applications
AD775JN is suitable for 6 applications: Industrial Process Signal Acquisition, Communications Waveform Capture, Digital Control and Feedback Systems, Test and Measurement Instrumentation, Pulse and Timing Monitoring, Legacy Data Acquisition Card Upgrade.
Industrial Process Signal Acquisition
The AD775JN is appropriate for acquiring rapidly varying process signals when 8-bit resolution and a 20 MSPS conversion rate provide sufficient information. Its differential input architecture supports measurement of a conditioned transducer signal, while the built-in sampling function reduces the external sample-and-hold burden. Differential nonlinearity of 0.3 LSB helps preserve code consistency near major transitions. The +5 V single supply and 60 mW power dissipation also simplify distributed acquisition electronics. Designers should add input protection, source-impedance balancing, and an anti-alias filter appropriate to the measured bandwidth before the signal reaches the converter.
Recommended
Communications Waveform Capture
The AD775JN can sample communications-related waveforms at 20 MSPS while retaining an 8-bit digital representation. This combination is useful when a system must observe envelope shape, timing transitions, or pulse amplitude without requiring the resolution of a high-order converter. The converter's pipelined ping-pong two-step flash architecture supports high throughput, and its 60 mW dissipation limits the thermal burden in communications equipment. In practice, the capture chain should include controlled impedance, a suitable anti-alias network, and digital logic capable of accepting the three-state output interface without adding excessive data-transition loading.
Recommended
Digital Control and Feedback Systems
The AD775JN can serve as the acquisition element in a fast digital control loop because its 20 MSPS sampling rate provides frequent updates from an analog command or feedback signal. The 8-bit result gives the controller a compact input format, while the converter's differential input can help reject common-mode variation when the sensing node is referenced to a defined analog common. The 60 mW power figure helps keep thermal loading modest in compact control assemblies. Loop stability still depends on total latency, converter timing, output word handling, and an analog compensation network designed independently of the converter's nominal acquisition rate.
Recommended
Test and Measurement Instrumentation
The AD775JN is appropriate for instrumentation that samples waveforms at up to 20 MSPS, including power-supply monitoring, repetitive transient capture, and educational laboratory systems. Its 8-bit resolution is well matched to displays and analysis systems that emphasize time-domain behavior rather than sub-LSB amplitude measurement. The through-hole 24-pin PDIP package also supports repairable and prototype-oriented instruments. Accurate results require controlled grounding, stable supply bypassing, an input driver capable of the converter's input requirements, and calibration for the specified 1% differential gain and 0.5-degree differential phase performance.
Recommended
Pulse and Timing Monitoring
The AD775JN's 20 MSPS throughput allows a system to examine short pulses, duty-cycle variations, and transient timing behavior that may be missed by slow sigma-delta converters. The 8-bit amplitude resolution is useful when the timing information is more important than high-resolution measurement of a small amplitude detail. Differential conversion can support sensing across two related nodes, and the integrated sampling function helps preserve a defined acquisition instant. The surrounding circuit should control source impedance and crosstalk, while downstream logic must derive timing from the converter clock and properly interpret its three-state outputs.
Recommended
Legacy Data Acquisition Card Upgrade
The AD775JN can be considered when maintaining or reproducing a legacy through-hole data-acquisition design that originally used the AD775 family's 24-pin PDIP interface. Its 8-bit resolution, 20 MSPS sampling rate, built-in sampler, and on-chip reference bias resistors reproduce the core functions of this established converter family. Because the DIP footprint and mixed-signal layout requirements can complicate upgrades, engineers should compare every power, clock, analog-input, reference, and output connection against the original schematic before substitution. The physical 24-pin package also requires adequate board spacing and through-hole assembly clearance.
Recommended
Recommended Products Summary
Engineering reference data for AD775JN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Analog Devices |
| Package | 24-pin PDIP |
| Resolution | 8 bit |
| Sampling Rate | 20 MSPS |
| Internal Maximum Sampling Rate | 35 MHz |
| Power Dissipation | 60 mW |
| Supply Voltage | +5 V single supply |
| Architecture | Pipelined ping-pong two-step flash |
| Differential Nonlinearity | 0.3 LSB |
| Differential Gain | 1% |
| Differential Phase | 0.5 degrees |
| Output Type | Three-state outputs |
Key Differentiators
- High-speed conversion in an established 24-pin through-hole package (vs AD7714YNZ)
- Integrated sampling and reference bias support (vs AD7714YNZ)
- Low-power pipelined flash implementation (vs AD7714YNZ)
Design Notes
Use the official datasheet pin-description table when laying out the AD775JN because the 24-pin PDIP footprint combines analog, digital, clock, power, and ground connections. Place input and bypass capacitors close to their associated pins, keep the analog input traces short, and provide a continuous ground reference beneath the device where board area permits. The through-hole package also benefits from adequate spacing for insertion, soldering, and inspection.
Treat the analog input as a high-speed signal even though the converter resolves only 8 bits. Use a controlled source impedance, minimize loop area, and place an anti-alias filter close to the input pin to suppress out-of-band energy that could alias into the sampled result. Digital output routing should remain short and isolated from the input network, particularly when the clock or output bus changes state rapidly.
Decouple the +5 V supply with capacitors selected according to the Analog Devices datasheet and the impedance requirements of your board. Keep the analog and digital return paths coordinated to limit ground potential differences across the converter. The specified 60 mW dissipation is modest, but supply layout still affects noise performance and should be reviewed together with the input driver and reference-bias network.
Do not substitute a similarly named 24-pin DIP converter solely by package count. The AD7714YNZ, for example, is a 24-bit sigma-delta ADC and differs in resolution, architecture, timing, and signal interface. Verify the complete AD775JN pin map, clock requirements, supply conditions, differential input arrangement, and three-state output behavior before considering any replacement for an assembled board.
Compliance Information
The AD775JN is identified as a commercial-extended through-hole DIP ADC. No explicit RoHS, REACH, lead-free, halogen-free, conflict-minerals, or AEC-Q100 qualification statement is present in the cited material.
