Part A
ADS7807U
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 7038 個数
- Package
- SOIC-28
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS7812U/1K is a strong functional replacement candidate for the ADS7807U, sharing the same 12-bit SAR architecture, 5 V supply, and 16-pin SOIC footprint. Designers should validate the serial interface timing and confirm the absence of an internal reference buffer before committing to a drop-in substitution in existing ADS7807U sockets.
Resolution and Architecture
High match
Package and Pinout
High match
Serial Interface Timing
Validation required
Internal Reference
Validation required
Parts at a glance
Part B
ADS7812U/1K
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6923 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 | ADS7807U | ADS7812U/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest measurable signal step; a 16-bit ADC provides 16x finer quantization than a 12-bit ADC, so these parts are not functionally interchangeable in precision applications. |
| Sampling Rate | 40 kSPS | 40 kSPS | Maximum throughput must meet the system's sampling requirement; both parts share the same 40 kSPS rate, so timing budgets are compatible. |
| Input Type | Single-ended | Single-ended | Input configuration must match the signal source topology; both accept single-ended inputs, so front-end circuitry can be reused. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the board's power rail; both operate from a single 5 V supply, simplifying power design. |
| Interface | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) | The digital interface must be compatible with the host controller; both use a serial interface, so firmware and pinout are largely interchangeable. |
| Package | 28-SOIC | 28-SOIC | Package footprint must match the PCB layout; both use a 28-pin SOIC, allowing drop-in replacement without layout changes. |
| Integral Nonlinearity (INL) | ±2 LSB (max) | ±1 LSB (max) | INL defines linearity error; the 12-bit part specifies tighter LSB linearity, but because the LSB sizes differ, absolute accuracy must be evaluated per application. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; both are rated for the industrial range, so environmental compatibility is equal. |
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 | ADS7807U | ADS7812U/1K |
|---|---|---|
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 40k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, Parallel | SPI |
| 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 the ADS7812U/1K?
The ADS7807U is a 16-bit successive-approximation ADC, while the ADS7812U is a 12-bit successive-approximation ADC. Both are offered in a 28-pin SOIC package and are designed for similar analog input ranges, but they differ in resolution, conversion timing, and specified performance parameters. The ADS7812U/1K denotes the ADS7812U supplied in tape-and-reel packaging (1,000 units per reel).
Are the ADS7807U and ADS7812U pin-compatible?
Both devices are packaged in a 28-pin SOIC (DW) package and share a similar pinout family from the same manufacturer, but designers must verify pin functions against the respective datasheets before substituting one for the other, because control-signal and configuration pin assignments can differ between the 16-bit and 12-bit devices.
What is the resolution and sampling rate of each device?
The ADS7807U provides 16-bit resolution with a specified sampling rate of 40 kSPS. The ADS7812U provides 12-bit resolution with a specified sampling rate of 40 kSPS. Both are successive-approximation register (SAR) converters with an internal sample-and-hold amplifier.
What analog input range do these ADCs support?
Both the ADS7807U and ADS7812U support bipolar analog input ranges of ±10 V and ±5 V, configurable via external connections as described in the respective datasheets. The input range selection is set by the user's external circuit configuration.
What is the difference between the ADS7812U and the ADS7812U/1K ordering code?
The ADS7812U/1K is the same ADS7812U device supplied in tape-and-reel packaging with a quantity of 1,000 units per reel. The electrical specifications and package type are identical; the "/1K" suffix denotes the packaging and order quantity, not a different silicon revision.
Can the ADS7812U be used as a drop-in replacement for the ADS7807U in an existing design?
No. Although both are 28-pin SOIC SAR ADCs from the same family, the ADS7807U is 16-bit and the ADS7812U is 12-bit, so the digital output word length, data format, and some control timing differ. A direct drop-in replacement is not valid without redesigning the digital interface and revalidating system accuracy requirements.
What digital interface do these converters provide?
Both the ADS7807U and ADS7812U provide a parallel digital output interface with a standard microprocessor-compatible control scheme, including chip-select, read, and convert-start signals. The ADS7807U outputs 16 data bits, while the ADS7812U outputs 12 data bits, so the host must accommodate the corresponding bus width.
Which device should be selected for higher-accuracy applications?
The ADS7807U should be selected when 16-bit resolution is required, since it provides four times the quantization resolution of the 12-bit ADS7812U. The ADS7812U is appropriate where 12-bit accuracy is sufficient and a narrower digital word is acceptable. Selection should be based on the required LSB size, accuracy budget, and interface width of the target system.