Part A
AD7710ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4329 個数
- Package
- SOIC-24
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Not a drop-in replacement
The AD7710ARZ and AD7715AR-3 are both 24-bit sigma-delta ADCs, but they differ fundamentally in resolution architecture, input channel configuration, supply voltage, and package footprint. The AD7715AR-3 offers only 16 bits of no-missing-code resolution versus 24 bits on the AD7710ARZ, supports a single differential input versus two channels, operates from a 3 V supply versus 5 V, and uses a narrower SOIC-16 package versus SOIC-24. These differences in core signal-chain capability and board layout make direct substitution impractical without redesign.
Different resolution architecture
Different channel count
Different supply voltage
Different package footprint
Parts at a glance
Part B
AD7715AR-3
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2523 個数
- Package
- SOIC-16
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD7710ARZ | AD7715AR-3 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 16 | Higher resolution allows detection of smaller signal changes; the 24-bit AD7710 offers finer measurement granularity than the 16-bit AD7715. |
| Number of input channels | 2 (differential) | 1 (differential) | Channel count determines how many signal sources can be measured; the AD7710 supports two differential inputs while the AD7715 supports one. |
| PGA gain range | 1 to 128 | 1, 2, 32, 128 | Programmable gain affects the ability to amplify small signals; the AD7710 offers continuous gain steps while the AD7715 offers discrete settings. |
| Supply voltage | 5 V (single) or ±5 V (dual) | 3 V (single) | Supply voltage must match the system power rail; the AD7715AR-3 is optimized for 3 V systems while the AD7710 requires 5 V. |
| Output data rate (max) | 1.028 kSPS | 500 SPS | Maximum output rate limits how fast measurements can be updated; the AD7710 supports roughly twice the throughput of the AD7715. |
| Interface type | Serial (bidirectional, SPI-compatible) | Serial (SPI/QSPI/MICROWIRE/DSP-compatible) | Interface compatibility determines ease of connection to a host controller; both are serial but differ in protocol flexibility. |
| Package | 24-lead SOIC | 16-lead SOIC | Package footprint affects PCB layout and board space; the AD7715 uses a smaller 16-lead package. |
| Operating temperature range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range indicates environmental suitability; both parts share the same industrial range. |
| Internal reference | No (external reference required) | No (external reference required) | Reference configuration affects accuracy and external component count; both require an external reference. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD7710ARZ | AD7715AR-3 |
|---|---|---|
| Supplier | - | Analog Devices Inc.,Rochester Electronics, LLC |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 16 |
| Sampling Rate(Per Second) | 1k | 500 |
| Number of Inputs | 2 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI, DSP |
| Configuration | MUX-PGA-ADC | PGA-ADC |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | Sigma-Delta |
| Reference Type | External, Internal | External |
| Voltage - Supply, Analog | 5V ~ 10V | 3V ~ 3.6V |
| Voltage - Supply, Digital | 5V | 3V ~ 5.25V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the AD7710ARZ and AD7715AR-3?
The AD7710ARZ is a 24-bit sigma-delta ADC with two differential input channels, an on-chip programmable gain amplifier (PGA), and a bidirectional serial interface. The AD7715AR-3 is a single-channel 16-bit sigma-delta ADC with an on-chip PGA, operating from a 3 V supply. The AD7710 offers higher resolution and dual channels, while the AD7715AR-3 provides lower resolution in a single-channel, lower-supply-voltage configuration.
Do the AD7710ARZ and AD7715AR-3 have the same resolution?
No. The AD7710ARZ provides 24-bit resolution, whereas the AD7715AR-3 provides 16-bit resolution. The AD7710 is therefore suited to higher-resolution measurement applications, while the AD7715AR-3 targets applications where 16-bit resolution is sufficient.
Are the AD7710ARZ and AD7715AR-3 pin-compatible?
No. The AD7710ARZ is supplied in a 24-lead SOIC package, and the AD7715AR-3 is supplied in a 16-lead SOIC package. The differing package sizes and pin counts mean they are not pin-compatible and cannot be interchanged on the same PCB footprint without redesign.
What supply voltage does each device require?
The AD7710ARZ operates from a 5 V analog supply (AVDD) and a 5 V digital supply (DVDD). The AD7715AR-3 operates from a 3 V supply, as indicated by the "-3" suffix in its part number. Designs must account for these differing supply requirements when considering either device.
How do the input channel configurations differ between the two parts?
The AD7710ARZ provides two differential input channels, allowing two separate signal sources to be measured. The AD7715AR-3 provides a single differential input channel. Applications requiring multiple input channels should account for this difference in channel count.
Can the AD7715AR-3 be used as a drop-in replacement for the AD7710ARZ?
No. The two devices differ in resolution (16-bit vs 24-bit), package and pin count (16-lead vs 24-lead SOIC), channel count (single vs dual), and supply voltage (3 V vs 5 V). A direct drop-in replacement is not possible; any substitution requires a full design review against the manufacturer datasheets.
Which device is better suited for low-power, 3 V portable designs?
The AD7715AR-3 is the more appropriate choice for 3 V portable designs, as it is specified to operate from a 3 V supply and provides a single-channel 16-bit sigma-delta conversion path. The AD7710ARZ, with its 5 V supplies, dual channels, and 24-bit resolution, is oriented toward higher-resolution, higher-supply-voltage systems.