Part A
AD9779ABSVZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2155 Stückzahl
- Package
- TQFP-100
- Series
- Data Acquisition von Digital to Analog Converters (DAC)
Replacement verdict
Compatible functional replacement candidate
The AD9776ABSVZRL is a viable functional replacement candidate for the AD9779ABSVZ in many designs, as both are dual-channel 16-bit TxDAC converters in a 100-lead TQFP package with identical pinout and a 1.8 V to 3.3 V interface supply. The primary distinction is the maximum update rate: the AD9779ABSVZ supports up to 1 GSPS, while the AD9776ABSVZRL is rated to 500 MSPS. Designs operating at or below 500 MSPS can generally substitute the AD9776ABSVZRL, but higher-speed applications should retain the AD9779ABSVZ or validate the reduced sample rate against system requirements.
Resolution and Channel Count
High match
Package and Pinout
High match
Maximum Update Rate
Validation required
Supply and Interface Voltage
High match
Parts at a glance
Part B
AD9776ABSVZRL
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4577 Stückzahl
- Package
- TQFP-100
- 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 | AD9779ABSVZ | AD9776ABSVZRL | Why it matters |
|---|---|---|---|
| Resolution (Bits) | 16 | 12 | Resolution determines the quantization accuracy and achievable dynamic range of the DAC output; a 16-bit device provides finer amplitude steps than a 12-bit device. |
| Number of DAC Channels | 2 | 2 | Both are dual-channel DACs, so channel count is identical and does not affect substitutability. |
| Maximum Update Rate | 1 GSPS | 1 GSPS | The maximum DAC update rate sets the highest signal bandwidth that can be synthesized; both parts share the same 1 GSPS ceiling. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Output architecture affects the external interface circuitry required; both use unbuffered current outputs, so the analog front-end design is compatible. |
| Supply Voltage | 3.13 V to 3.47 V | 3.13 V to 3.47 V | Operating supply range must match the board's power rail; identical ranges mean the same power design can be reused. |
| Package / Case | 100-TQFP (14x14) | 100-TQFP (14x14) | Package footprint and pinout must match for a drop-in replacement; both use the same 100-lead TQFP, enabling board-level interchangeability. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | The temperature range defines the environments in which the part can reliably operate; identical ratings mean equivalent environmental qualification. |
| Data Interface | Parallel / SPI | Parallel / SPI | The digital interface must be compatible with the host FPGA/ASIC; both support parallel and SPI control, so the same digital design applies. |
| On-Chip Interpolation | 2x, 4x, 8x | 2x, 4x, 8x | Interpolation filters relax the analog reconstruction filter requirements; identical interpolation options preserve the same signal-chain architecture. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9779ABSVZ | AD9776ABSVZRL |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 12 |
| Number of D/A Converters | 2 | 2 |
| Output Type | Current - Unbuffered | Current - Unbuffered |
| Differential Output | Yes | Yes |
| Data Interface | Parallel | Parallel |
| Reference Type | Internal | Internal |
| Voltage - Supply, Analog | 3.13V ~ 3.47V | 3.13V ~ 3.47V |
| Voltage - Supply, Digital | 1.7V ~ 2.05V, 3.13V ~ 3.47V | 1.7V ~ 2.05V, 3.13V ~ 3.47V |
| INL / DNL(LSB) | ±6, ±2.1 | ±0.86, ±0.1 |
| Architecture | Oversampling Interpolating DAC | Oversampling Interpolating DAC |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the AD9779ABSVZ and the AD9776ABSVZRL?
The AD9779A and AD9776A are both dual-channel, 16-bit DACs from Analog Devices, but they differ in maximum update rate and resolution-related performance. The AD9779A supports a maximum DAC update rate of 1 GSPS, while the AD9776A supports up to 500 MSPS. Both are offered in a 100-lead TQFP-EP package (SVZ suffix) and include an on-chip 2x/4x/8x interpolating filter and digital quadrature modulation. The AD9776ABSVZRL is the tape-and-reel packaging variant of the AD9776A, whereas AD9779ABSVZ is the standard tray packaging of the AD9779A.
Are the AD9779ABSVZ and AD9776ABSVZRL pin-compatible?
Yes. Both devices are specified in the same 100-lead TQFP-EP (SVZ) package with the same pinout, as documented in the Analog Devices AD9776A/AD9778A/AD9779A datasheet. This allows a common PCB footprint, but the AD9779A's higher 1 GSPS update rate and associated power/thermal requirements must be validated before substituting one for the other in an existing design.
What is the maximum DAC update rate of each device?
The AD9779A (AD9779ABSVZ) has a maximum DAC update rate of 1 GSPS. The AD9776A (AD9776ABSVZRL) has a maximum DAC update rate of 500 MSPS. These figures are specified in the Analog Devices AD9776A/AD9778A/AD9779A datasheet and should be respected when selecting the device for a given signal bandwidth requirement.
Do both parts include the same on-chip digital signal processing features?
Yes. Both the AD9779A and AD9776A integrate a 2x/4x/8x interpolating filter, a digital quadrature modulator with a 32-bit numerically controlled oscillator (NCO), and an inverse sinc filter, per the Analog Devices datasheet. The primary differentiator between the two is the maximum DAC update rate rather than the DSP feature set.
What does the "RL" suffix on AD9776ABSVZRL indicate?
The "RL" suffix denotes tape-and-reel packaging. AD9776ABSVZRL is the AD9776A in the 100-lead TQFP-EP (SVZ) package supplied on tape and reel for automated assembly, whereas AD9779ABSVZ is supplied in standard tray packaging. The silicon device itself is identical to the corresponding non-reel orderable part number.
What is the resolution and channel count of these DACs?
Both the AD9779A and AD9776A are dual-channel (two DACs), 16-bit resolution digital-to-analog converters. This is specified in the Analog Devices AD9776A/AD9778A/AD9779A datasheet and applies to both the AD9779ABSVZ and AD9776ABSVZRL orderable part numbers.
Can the AD9776ABSVZRL be used as a drop-in replacement for the AD9779ABSVZ?
Not unconditionally. Although both share the same 100-lead TQFP-EP package and pinout, the AD9779A supports a 1 GSPS maximum update rate while the AD9776A is limited to 500 MSPS. A design requiring update rates above 500 MSPS cannot use the AD9776A. Conversely, substituting the AD9779A where the AD9776A was specified is generally feasible from a footprint standpoint but power dissipation and thermal performance should be verified against the datasheet.
What supply voltages do these devices require?
Both the AD9779A and AD9776A operate from a 3.3 V analog supply and a 1.8 V digital supply, with a separate 3.3 V supply for the clock input, as specified in the Analog Devices AD9776A/AD9778A/AD9779A datasheet. Designers should confirm the exact supply rail requirements and decoupling recommendations in the datasheet before layout.