Part A
AD783JR
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2889 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Not a drop-in replacement
The AD783JR and AD7834AR-REEL are not functionally interchangeable. Although both are Analog Devices sample-and-hold amplifiers, they differ in channel count, package footprint, and electrical characteristics, so the AD7834AR-REEL cannot directly replace the AD783JR without circuit and layout redesign.
Different channel count
Different package footprint
Different supply configuration
Different acquisition dynamics
Parts at a glance
Part B
AD7834AR-REEL
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5211 個数
- Package
- SOIC-28
- Series
- データ取得 - デジタル/アナログコンバータ (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 | AD783JR | AD7834AR-REEL | Why it matters |
|---|---|---|---|
| Resolution | 12 bit | 14 bit | Higher resolution provides finer output granularity, which directly affects achievable accuracy and step size in the application. |
| Number of DAC Channels | 1 | 4 | Channel count determines how many independent analog outputs are available; a 4-channel part cannot be substituted where multiple outputs are required. |
| Output Voltage Range | ±10 V (bipolar) | ±10 V (bipolar) | Matching output span ensures the DAC can drive the same signal range without additional level shifting. |
| Digital Interface | Parallel (12-bit) | Serial (SPI/QSPI compatible) | The interface type must match the host controller; parallel and serial parts are not pin- or protocol-compatible. |
| Package / Mounting | 28-lead SOIC (surface mount) | 28-lead SOIC (surface mount, tape and reel) | Package and mounting style affect PCB footprint and assembly; tape-and-reel packaging also impacts production handling. |
| Supply Voltage | ±12 V to ±15 V (dual supply) | ±12 V to ±15 V (dual supply) | Compatible supply rails allow the part to operate in the same power architecture without redesign. |
| 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 applications. |
| Settling Time | 5 µs (to ±1/2 LSB) | 10 µs (to ±1/2 LSB) | Settling time limits update rate; slower settling reduces maximum achievable throughput in dynamic systems. |
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 | AD783JR | AD7834AR-REEL |
|---|---|---|
| Supplier | - | Analog Devices Inc. |
| Part Status | Obsolete | 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 AD783JR and AD7834AR-REEL functionally equivalent?
No. The AD783JR is a complete monolithic sample-and-hold amplifier, while the AD7834AR-REEL is a quad 14-bit voltage-output DAC. They are different functional classes of devices and are not interchangeable.
What are the key differences in package and pinout between the AD783JR and AD7834AR-REEL?
The AD783JR is supplied in a 20-lead SOIC (R-20) package, whereas the AD7834AR-REEL is supplied in a 28-lead SOIC (R-28) package. The different lead counts and pin functions prevent a direct drop-in replacement.
What is the resolution and architecture of the AD7834AR-REEL?
The AD7834AR-REEL is a quad 14-bit voltage-output digital-to-analog converter with a serial interface, offering four independent DAC channels in a single package.
What function does the AD783JR perform in a signal chain?
The AD783JR is a sample-and-hold amplifier that acquires an analog input and holds it stable for subsequent conversion, typically used ahead of an ADC to reduce conversion errors on time-varying signals.
Can the AD783JR and AD7834AR-REEL share the same PCB footprint?
No. The AD783JR uses a 20-lead SOIC footprint and the AD7834AR-REEL uses a 28-lead SOIC footprint, so the PCB land patterns are not compatible.
Does the AD7834AR-REEL support multiple DAC channels in one package?
Yes. The AD7834AR-REEL integrates four independent 14-bit DAC channels, which reduces board space compared with using four separate single-channel DACs.
What should be verified before considering either part for a design?
Confirm the required function (sample-and-hold versus DAC), resolution, channel count, supply requirements, interface type, and package footprint against the respective manufacturer datasheets, since the two parts serve different roles and are not substitutes.