Part A
ADS7807U
德州儀器
- Lifecycle
- Active
- Stock
- 7038 件
- Package
- SOIC-28
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7807U and ADS7804UE4 are both 12-bit successive-approximation ADCs from Texas Instruments in a 28-pin SOIC package with a parallel interface, making them strong functional replacement candidates. The ADS7807U offers a wider input range and higher throughput, while the ADS7804UE4 provides a unipolar input span; designers should validate the analog input configuration and timing margins against the target application before substituting.
Resolution
High match
Package Type
High match
Output Interface
High match
Analog Input Range
Validation required
Parts at a glance
Part B
ADS7804UE4
德州儀器
- Lifecycle
- Active
- Stock
- 4392 件
- Package
- SOIC-28
- Series
- 資料獲取-模數轉換器（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 | ADS7807U | ADS7804UE4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest analog signal change the ADC can distinguish; a 16-bit device provides 16x finer quantization than a 12-bit device, so they are not functionally interchangeable in precision applications. |
| Sampling Rate | 40 kSPS | 100 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the ADS7804 supports faster sampling, which matters for higher-frequency or multiplexed acquisition systems. |
| Input Type | Single-ended | Single-ended | Input configuration affects how the sensor or signal source must be connected; both are single-ended, so the analog front-end topology is compatible. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the system rail; both operate from a single 5 V supply, simplifying power design compatibility. |
| Interface | Parallel | Parallel | The digital interface determines how the ADC connects to the host processor; both use a parallel interface, so bus wiring and timing architecture are similar. |
| Package / Mounting | 28-SOIC (surface mount) | 28-SOIC (surface mount) | Package and mounting style affect PCB footprint and assembly; matching SOIC packages allow the same board layout to be reused. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range defines the environments in which the part is guaranteed to meet specifications; identical industrial ranges mean equivalent environmental suitability. |
| Reference Type | Internal | Internal | An internal reference simplifies the analog design by removing the need for an external reference; both include an internal reference, so system accuracy budgeting is comparable. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7807U | ADS7804UE4 |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 100k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | Parallel |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
Frequently asked questions
What are the key differences between the ADS7807U and ADS7804UE4?
The ADS7807U is a 16-bit successive-approximation ADC, while the ADS7804UE4 is a 12-bit successive-approximation ADC. Both are pin-compatible in the same 28-pin SOIC package and share the same internal architecture family from Texas Instruments, but they differ in resolution, conversion time, and specified performance grades. The ADS7807U offers 16-bit resolution with a conversion time of 8 µs max, while the ADS7804UE4 offers 12-bit resolution with a conversion time of 8 µs max. Designers must account for the resolution difference when considering substitution.
Are the ADS7807U and ADS7804UE4 pin-compatible?
Yes. Both devices are offered in a 28-pin SOIC (DW) package with the same pinout, which is a key reason they are often compared for replacement or upgrade purposes. However, pin compatibility does not guarantee functional equivalence; the resolution and digital output format differ, so firmware and system-level validation are required before substitution.
What is the resolution and conversion time of each device?
The ADS7807U provides 16-bit resolution with a maximum conversion time of 8 µs. The ADS7804UE4 provides 12-bit resolution with a maximum conversion time of 8 µs. Both use successive-approximation register (SAR) architecture with an internal sample-and-hold amplifier.
Do both parts support the same analog input range?
Both devices support bipolar input ranges of ±10 V and ±5 V, as well as a unipolar 0 V to 10 V range, configured via external pin strapping. This common input flexibility allows both parts to interface with similar signal-conditioning front ends, though the 16-bit ADS7807U resolves the input to a finer LSB size than the 12-bit ADS7804UE4.
What is the difference in LSB size between the two converters?
With a ±10 V input range, the 16-bit ADS7807U has an LSB size of approximately 305 µV, while the 12-bit ADS7804UE4 has an LSB size of approximately 4.88 mV. This roughly 16x difference in resolution affects achievable measurement precision and should be evaluated against system accuracy requirements.
Are the digital interfaces of the ADS7807U and ADS7804UE4 identical?
Both devices provide a parallel digital output interface with similar control signals (CS, R/C, BYTE, and BUSY), and both support 8-bit and 16-bit bus modes. However, because the ADS7807U outputs 16 bits and the ADS7804UE4 outputs 12 bits, the data word width and the handling of unused output bits differ, so the host interface timing and data formatting must be verified against each datasheet.
Can the ADS7804UE4 be used as a drop-in replacement for the ADS7807U?
Not as a true drop-in replacement. Although the packages and pinouts match, the ADS7804UE4 provides only 12-bit resolution versus 16 bits for the ADS7807U, so system resolution and accuracy would be reduced. A replacement is only appropriate if the application can tolerate 12-bit performance and the firmware is validated for the different output data format.
What are the operating temperature ranges and package options for these devices?
Both the ADS7807U and ADS7804UE4 are specified for the industrial temperature range of −40 °C to +85 °C and are offered in a 28-pin SOIC package. The "U" suffix in both part numbers denotes the SOIC package variant from Texas Instruments.