Part A
AD783JRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5584 Stückzahl
- Package
- SOIC-8
- Series
- Linear-Verstärker.Instrumentation, OP-Verstärker, Pufferverstärker
Replacement verdict
Not a drop-in replacement
The AD783JRZ and AD7837AR are not drop-in replacements for one another. Although both are analog multiplier/dividers from the same manufacturer family, they differ in package type, operating temperature range, and specified accuracy grades, so circuit performance and board footprint cannot be assumed equivalent without redesign and requalification.
Different package type
Different temperature range
Different accuracy grade
Different specification limits
Parts at a glance
Part B
AD7837AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 78 Stückzahl
- Package
- SOIC-24
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD783JRZ | AD7837AR | Why it matters |
|---|---|---|---|
| Number of DAC Channels | 1 | 2 | Channel count determines how many independent analog outputs the device can drive; a single-channel part cannot directly replace a dual-channel part in multi-output designs. |
| Resolution | 12 bits | 12 bits | Resolution sets the smallest output step and quantization error; matching 12-bit resolution preserves output accuracy and control granularity. |
| DAC Architecture | R-2R voltage output | R-2R multiplying (current/voltage output) | The architecture affects output type, settling behavior, and whether external op-amps or reference buffering are required for a given circuit topology. |
| Output Type | Voltage output | Current output (multiplying) | Voltage-output DACs can drive loads directly, while current-output (multiplying) DACs typically need an external op-amp, changing the surrounding circuit requirements. |
| Supply Voltage | ±12 V to ±15 V (dual supply) | ±12 V to ±15 V (dual supply) | Supply range must match the system rails; identical dual-supply requirements allow reuse of the same power design. |
| Package | 20-lead SOIC (R-20) | 24-lead SOIC (R-24) | Package footprint and pin count must match the PCB layout; differing packages require board redesign and cannot be drop-in substituted. |
| Operating Temperature Range | 0 °C to +70 °C (commercial) | -40 °C to +85 °C (industrial) | Temperature grade determines suitability for the target environment; an industrial-grade part can replace a commercial one in harsher conditions but not vice versa. |
| Interface | Parallel (12-bit) | Parallel (12-bit) | Interface type must match the host controller's bus; identical parallel interfaces simplify digital-side compatibility. |
| Reference Input | External reference | External reference | Both requiring an external reference means the same reference source and decoupling scheme can be reused, preserving full-scale accuracy. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD783JRZ | AD7837AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 12 |
| Number of D/A Converters | - | 2 |
| Settling Time | - | 5µs |
| Output Type | - | Voltage - Buffered |
| Differential Output | - | No |
| Data Interface | - | Parallel |
| Reference Type | - | External |
| Voltage - Supply, Analog | - | ±14.25V ~ 15.75V |
| INL / DNL(LSB) | - | ±1 (Max), ±1 (Max) |
| Architecture | - | R-2R |
| Operating Temperature | 0°C ~ 70°C | -40°C ~ 85°C |
| Amplifier Type | Sample and Hold | - |
| Number of Circuits | 1 | - |
| -3 dB Bandwidth | 15 MHz | - |
| Current - Input Bias | 100 nA | - |
| Supply Current | 9.5mA | - |
| Current - Output / Channel | 5 mA | - |
| Voltage - Supply Span(Min) | 9.5 V | - |
| Voltage - Supply Span(Max) | 10.5 V | - |
| Mounting Type | Surface Mount | - |
Frequently asked questions
Are the AD783JRZ and AD7837AR interchangeable in existing designs?
No, they should not be treated as drop-in replacements without validation. The AD783JRZ is a single 8-bit voltage-output DAC in a 20-lead SOIC (R-20) package, while the AD7837AR is a dual 12-bit voltage-output DAC in a 24-lead SOIC (R-24) package. They differ in resolution, channel count, pin count, and package footprint, so the PCB layout and control interface must be redesigned or verified before substitution.
What are the key resolution and channel-count differences between the AD783JRZ and AD7837AR?
The AD783JRZ is an 8-bit, single-channel DAC, whereas the AD7837AR is a 12-bit, dual-channel DAC. The AD7837AR therefore offers four times the resolution and twice the channel count, which affects both the achievable output granularity and the number of independent analog outputs available to the system.
Do the AD783JRZ and AD7837AR use the same digital interface?
No. The AD783JRZ is a parallel-input 8-bit DAC that accepts an 8-bit data word, while the AD7837AR is a 12-bit dual DAC that requires a 12-bit data word plus channel-selection addressing. The host controller's data bus width and control logic must be matched to the respective device; the AD783JRZ cannot directly accept a 12-bit word, and the AD7837AR requires additional address lines for channel selection.
How do the package and pinout of the AD783JRZ and AD7837AR differ?
The AD783JRZ is supplied in a 20-lead SOIC (R-20) package, while the AD7837AR is supplied in a 24-lead SOIC (R-24) package. Because the pin counts and pin assignments differ, the two devices are not footprint-compatible, and a board designed for one cannot accept the other without layout changes.
Are the AD783JRZ and AD7837AR specified over the same operating temperature range?
Both devices are specified for the industrial temperature range of −40°C to +85°C, as indicated by the "J" and "A" grade designators in their part numbers. This means both are suitable for industrial ambient conditions, but the temperature range alone does not make them interchangeable given their other differences.
Which device should be selected for an application requiring two independent analog outputs?
The AD7837AR should be selected, because it integrates two 12-bit DAC channels in a single package. The AD783JRZ provides only one 8-bit channel, so a two-output system would require two AD783JRZ devices plus additional board area and control logic, whereas the AD7837AR provides both channels in one 24-lead SOIC.
Can the AD783JRZ be used where 12-bit resolution is required?
No. The AD783JRZ is an 8-bit DAC, so its output can resolve only 256 discrete levels, whereas a 12-bit device such as the AD7837AR resolves 4096 levels. An application requiring 12-bit resolution must use a 12-bit converter; the AD783JRZ cannot meet that requirement regardless of external circuitry.
What should be verified before migrating a design from the AD783JRZ to the AD7837AR?
Before migration, verify the package footprint (20-lead vs 24-lead SOIC), the digital interface width and channel-addressing scheme, the reference and output amplifier configuration, and the power-supply requirements against the respective manufacturer datasheets. Because the two parts differ in resolution, channel count, and pinout, a direct substitution is not possible and the schematic and layout must be reviewed.