Part A
AD9764ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 5181 個数
- Series
- データ取得 - デジタル/アナログコンバータ (DAC)
Replacement verdict
Not a drop-in replacement
The AD9764ARZ and AD976BRS are not drop-in replacements for one another. The AD9764ARZ is a 14-bit, 125 MSPS TxDAC+ digital-to-analog converter in a 28-lead SOIC package, while the AD976BRS is a 16-bit, 100 kSPS successive-approximation ADC in a 28-lead SSOP package. They differ in converter function, resolution, sample rate, and package footprint, so substitution requires full electrical and mechanical redesign validation.
Different converter function
Different resolution
Different sample rate
Different package footprint
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD9764ARZ | AD976BRS | Why it matters |
|---|---|---|---|
| Resolution | 14 bit | 16 bit | Resolution determines the number of discrete output levels; a 16-bit DAC offers finer quantization than a 14-bit DAC, affecting achievable dynamic range and accuracy. |
| Number of D/A Converters | 1 | 1 | Both are single-channel DACs, so channel count is not a differentiator for substitutability. |
| Output Type | Current - Unbuffered | Current - Unbuffered | Both provide unbuffered current outputs, requiring an external op-amp for voltage conversion; matching output architecture simplifies circuit reuse. |
| Supply Voltage | 2.7 V to 5.5 V | 5 V | The wider supply range of the AD9764ARZ allows operation at lower voltages, while the AD976BRS is fixed at 5 V, affecting system power design and compatibility. |
| Settling Time | 35 ns | 35 ns | Settling time determines how quickly the DAC output reaches its final value; identical values indicate comparable speed performance. |
| Operating Temperature Range | -40°C to 85°C | -40°C to 85°C | Matching industrial temperature ranges ensure both parts can be used in the same environmental conditions. |
| Package / Case | 28-SOIC | 28-SSOP | Different package footprints (SOIC vs SSOP) require different PCB land patterns, so they are not drop-in replacements without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, so assembly technology is compatible. |
| Data Interface | Parallel | Parallel | Both use a parallel input interface, allowing similar digital host connections and timing considerations. |
| Reference Type | External, Internal | External, Internal | Both support internal and external references, giving flexibility in reference design and matching system architecture. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD9764ARZ | AD976BRS |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 14 | 16 |
| Sampling Rate(Per Second) | - | 100k |
| Number of Inputs | - | 1 |
| Input Type | - | Single Ended |
| Data Interface | Parallel | Parallel |
| Configuration | - | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | Current Source | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 2.7V ~ 5.5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 5.5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Series | TxDAC® | - |
| Base Product Number | AD9764 | - |
| Number of D / A Converters | 1 | - |
| Settling Time | 35ns (Typ) | - |
| Output Type | Current - Unbuffered | - |
| Differential Output | Yes | - |
| INL / DNL (LSB) | ±2.5, ±1.5 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Tube | - |
Frequently asked questions
Are the AD9764ARZ and AD976BRS interchangeable in an existing design?
No. The AD9764ARZ is a 14-bit, 125 MSPS TxDAC digital-to-analog converter in a 28-lead SOIC package, while the AD976BRS is a 16-bit, 100 kSPS successive-approximation ADC in a 28-lead SSOP package. They differ in resolution, conversion architecture, sample rate, and package footprint, so they are not pin- or function-compatible substitutes.
What are the core functional differences between the AD9764ARZ and AD976BRS?
The AD9764ARZ is a high-speed current-output DAC intended for transmit signal paths, specified for 125 MSPS operation with 14-bit resolution. The AD976BRS is a voltage-input SAR analog-to-digital converter with 16-bit resolution and a 100 kSPS throughput rate, intended for precision acquisition paths. One converts digital to analog at high speed; the other converts analog to digital at high precision.
Do the AD9764ARZ and AD976BRS use the same package and pinout?
No. The AD9764ARZ is supplied in a 28-lead SOIC (R-28) package, and the AD976BRS is supplied in a 28-lead SSOP (RS-28) package. The package body widths and lead pitches differ, so PCB land patterns are not shared and the devices cannot be dropped into the same footprint.
What are the supply voltage and interface requirements for each device?
The AD9764ARZ operates from a single 2.7 V to 5.5 V supply with a nominal 5 V analog supply and 3 V to 5 V digital supply, and accepts a parallel digital input word. The AD976BRS operates from a +5 V supply with a parallel 16-bit output bus and standard microprocessor interface control lines. Supply rails and bus widths are not equivalent between the two parts.
Can the AD9764ARZ be used as a replacement for the AD976BRS in a data acquisition circuit?
No. The AD9764ARZ is a DAC and cannot perform the analog-to-digital conversion function of the AD976BRS. Replacing an ADC with a DAC would remove the acquisition path entirely; the correct replacement must be an ADC with matching resolution, sample rate, and interface.
Which device is better suited for high-speed signal generation versus precision measurement?
The AD9764ARZ is suited to high-speed signal generation because of its 125 MSPS update rate and 14-bit DAC resolution. The AD976BRS is suited to precision measurement because of its 16-bit SAR architecture and 100 kSPS throughput. Selection should follow the signal chain direction and required dynamic performance rather than package similarity.
Are the AD9764ARZ and AD976BRS available in RoHS-compliant versions?
The AD9764ARZ suffix indicates a RoHS-compliant SOIC package per Analog Devices ordering nomenclature. The AD976BRS is an older SSOP ordering code; RoHS status must be confirmed against the specific manufacturer datasheet and ordering guide for the exact date code and package variant, as the base part number alone does not guarantee compliance.