Part A
ADS7809U
德州儀器
- Lifecycle
- Active
- Stock
- 6471 件
- Package
- SOIC-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS7813U/1K is a strong functional replacement candidate for the ADS7809U, sharing the same 16-bit SAR architecture, 5 V supply, and pin-compatible SOIC-28 footprint. Designers should validate the tighter ±1.5 LSB INL, faster 40 kSPS throughput, and serial-only interface against system timing and linearity budgets before qualifying the substitution.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage
High match
Interface and Timing
Validation required
Parts at a glance
Part B
ADS7813U/1K
德州儀器
- Lifecycle
- Active
- Stock
- 2270 件
- Package
- SOIC-16
- 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 | ADS7809U | ADS7813U/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so nominal resolution is identical and does not differentiate substitutability. |
| Sampling Rate | 100 kSPS | 40 kSPS | The ADS7809U supports a higher throughput, which matters for faster signal acquisition and wider bandwidth applications. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so the input topology is compatible for direct substitution. |
| Input Voltage Range | ±10 V | ±10 V | Matching bipolar input ranges allow the same front-end signal conditioning to be reused. |
| Supply Voltage | 5 V | 5 V | Identical single 5 V supply simplifies power rail design and allows drop-in replacement. |
| Interface | Serial (SPI/QSPI/MICROWIRE) | Serial (SPI/QSPI/MICROWIRE) | Same serial interface protocol means the digital host connection can remain unchanged. |
| Package | 28-SOIC | 28-SOIC | Identical package and pinout enable physical board-level interchangeability. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Same industrial temperature range ensures equivalent environmental robustness. |
| Power Consumption | Approx. 100 mW | Approx. 60 mW | Lower power dissipation in the ADS7813U/1K benefits thermally constrained or battery-powered designs. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7809U | ADS7813U/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 100k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | 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 ADS7809U and the ADS7813U/1K?
Both are 16-bit successive-approximation analog-to-digital converters from Texas Instruments in a 28-pin SOIC package, but they differ in sampling rate and interface. The ADS7809U offers a 100 kSPS throughput with a parallel 16-bit output interface, while the ADS7813U/1K provides a 40 kSPS throughput with a serial SPI-compatible output interface. The ADS7813U/1K is supplied in a 1,000-unit reel (the "1K" suffix), whereas the ADS7809U is typically ordered in tube quantities.
Are the ADS7809U and ADS7813U/1K pin-compatible?
No. Although both devices are housed in a 28-pin SOIC package, their pin functions differ because the ADS7809U uses a parallel data bus and the ADS7813U/1K uses a serial interface. The digital I/O pins are not interchangeable, so the PCB layout and host interface must be designed for the specific device.
Can the ADS7809U be used as a drop-in replacement for the ADS7813U/1K?
No. The ADS7809U has a parallel output interface and a 100 kSPS rate, while the ADS7813U/1K has a serial interface and a 40 kSPS rate. The differing pin functions, interface protocol, and throughput mean a direct drop-in substitution is not possible without redesigning the digital interface and verifying timing against the respective datasheets.
What are the resolution and throughput specifications of each device?
Both converters provide 16-bit resolution. The ADS7809U has a maximum throughput of 100 kSPS, and the ADS7813U/1K has a maximum throughput of 40 kSPS. These figures are specified in the respective Texas Instruments datasheets.
What output interface does each converter provide?
The ADS7809U provides a parallel 16-bit output interface, allowing direct connection to a parallel data bus. The ADS7813U/1K provides a serial output interface compatible with SPI and similar serial host ports. The choice depends on the host microcontroller or DSP interface available in the design.
Do both devices operate from the same analog supply voltage?
Both the ADS7809U and ADS7813U/1K are specified for a single +5 V analog supply with a corresponding +5 V digital supply, as documented in their Texas Instruments datasheets. Designers should confirm the exact supply and reference requirements in the respective datasheet before layout.
What package and ordering options are available for these parts?
Both devices are offered in a 28-pin SOIC package. The ADS7809U is the tube-orderable SOIC version, while the ADS7813U/1K denotes the SOIC version supplied on a 1,000-piece tape-and-reel. Buyers should verify current ordering codes and packaging on the manufacturer or authorized distributor listing.
Which device should be selected for a high-speed acquisition design?
For higher throughput, the ADS7809U is the appropriate choice because it supports up to 100 kSPS, compared with 40 kSPS for the ADS7813U/1K. The parallel interface of the ADS7809U also suits hosts with a wide data bus, while the ADS7813U/1K is better suited to space-constrained serial interfaces where 40 kSPS is sufficient.