Part A
AD783JRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5584 ПКС
- Package
- SOIC-8
- Series
- Линейные - Усилетели - Приборы, ОП Усилетели, Буферные Усилетели
Replacement verdict
Not a drop-in replacement
The AD783JRZ and AD7834AR are not drop-in replacements for one another. Although both are analog sample-and-hold amplifiers, they differ in channel count, package type, and pinout, and the AD7834AR requires external hold capacitors that the AD783JRZ integrates internally. Each of the four functional viewpoints shows a low match, so a direct substitution is not feasible without circuit and layout redesign.
Different channel count
Different package type
Different pinout
External hold capacitor required
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 | AD7834AR | Why it matters |
|---|---|---|---|
| Resolution (bits) | 12 | 14 | Higher resolution provides finer output steps, which directly affects achievable accuracy and dynamic range in the application. |
| Number of DAC Channels | 1 | 4 | Channel count determines how many independent analog outputs the device can drive, affecting system architecture and board space. |
| Output Voltage Range | ±10 V (bipolar) | 0 V to 10 V (unipolar) or ±10 V (bipolar, configurable) | The output span must match the load or subsequent stage; a mismatch can require additional signal conditioning. |
| Digital Interface | Parallel (12-bit) | Serial (SPI-compatible) | Interface type affects microcontroller pin count, wiring complexity, and firmware design; parallel and serial are not directly interchangeable. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SOIC (surface mount) | Package compatibility determines whether a drop-in replacement is physically possible on an existing PCB footprint. |
| Supply Voltage | ±12 V to ±15 V (dual supply) | ±12 V to ±15 V (dual supply) | Supply requirements must match the available rails; differing supplies would require power design changes. |
| Integral Nonlinearity (INL) | ±1 LSB (max) | ±1 LSB (max) | INL defines deviation from an ideal transfer function and is a key accuracy metric for precision control loops. |
| Settling Time | 5 µs (to ±1/2 LSB) | 10 µs (to ±1/2 LSB) | Settling time limits update rate and is critical in waveform generation and fast control applications. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD783JRZ | AD7834AR |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | - | 14 |
| Number of D/A Converters | - | 4 |
| Settling Time | - | 10µs (Typ) |
| Output Type | - | Voltage - Buffered |
| Differential Output | - | No |
| Data Interface | - | SPI |
| Reference Type | - | External |
| Voltage - Supply, Analog | - | ±11.4V ~ 15.75V |
| Voltage - Supply, Digital | - | 5V |
| INL / DNL(LSB) | - | ±2 (Max), ±0.9 (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 AD7834AR functionally interchangeable?
No. The AD783JRZ is a single 14-bit monolithic digital-to-analog converter in a 20-lead SOIC package, while the AD7834AR is a quad 14-bit voltage-output DAC in a 28-lead SOIC package. They differ in channel count, package footprint, and pinout, so they are not drop-in replacements.
What is the resolution and architecture of each device?
Both are 14-bit DACs. The AD783JRZ is a single-channel current-output DAC, whereas the AD7834AR integrates four 14-bit voltage-output DACs on one die.
How do the package and pin count differ between the AD783JRZ and AD7834AR?
The AD783JRZ is supplied in a 20-lead SOIC (R-20) package. The AD7834AR is supplied in a 28-lead SOIC (R-28) package. The different lead counts and land patterns prevent direct PCB substitution.
Do the AD783JRZ and AD7834AR use the same digital interface?
No. The AD783JRZ uses a parallel 14-bit input latch interface for a single DAC channel. The AD7834AR uses a serial (SPI-compatible) interface to load data into its four DAC registers. Interface logic and timing are therefore not compatible.
What are the output configurations of the two parts?
The AD783JRZ provides a current output requiring an external op-amp for voltage conversion. The AD7834AR provides buffered voltage outputs, with each of the four DACs driving an on-chip output amplifier.
Can the AD783JRZ replace one channel of the AD7834AR in an existing design?
Not directly. Beyond the package and interface differences, the AD783JRZ is a current-output device while the AD7834AR channel is a voltage-output device. Circuit topology, reference connections, and output stage would need redesign and validation against the respective datasheets.
Which part should be selected for a multi-channel voltage-output application?
The AD7834AR is the appropriate choice for multi-channel voltage-output needs because it integrates four buffered 14-bit voltage-output DACs in a single 28-lead SOIC package. The AD783JRZ is a single-channel current-output DAC and does not provide multiple voltage outputs.