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 ADS7813UB/1K is a viable functional replacement candidate for the ADS7809U, sharing the same 16-bit SAR architecture, 5 V supply, and 200 kSPS throughput in a pin-compatible SOIC-28 package. Designers should validate the serial interface timing and confirm the narrower input voltage range before substituting in existing ADS7809U sockets.
Resolution and Architecture
High match
Package and Pinout
High match
Input Voltage Range
Validation required
Digital Interface Timing
Validation required
Parts at a glance
Part B
ADS7813UB/1K
德州儀器
- Lifecycle
- Active
- Stock
- 4253 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 | ADS7813UB/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, so it can replace the slower ADS7813UB in most applications but not vice versa when 100 kSPS is required. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so signal conditioning topology remains compatible. |
| Input Voltage Range | ±10 V | ±10 V | Identical bipolar input range means the same front-end scaling and protection circuitry can be reused. |
| Interface | Parallel | Serial (SPI/QSPI) | The output interface differs fundamentally; a parallel host cannot directly read the serial ADS7813UB without glue logic or a different MCU/FPGA configuration. |
| Supply Voltage | 5 V | 5 V | Both operate from a single 5 V supply, so power rail design is unchanged. |
| Package | 28-SOIC | 28-SOIC | Same package footprint allows a drop-in board layout swap without mechanical redesign. |
| INL (Max) | ±3 LSB | ±2 LSB | The ADS7813UB offers tighter linearity, which matters for precision measurement accuracy in high-resolution systems. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range means both suit the same environmental conditions. |
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 | ADS7809U | ADS7813UB/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 ADS7813UB/1K?
The ADS7809U is a 16-bit, 100-kSPS successive-approximation ADC with a parallel interface, while the ADS7813UB/1K is a 16-bit, 40-kSPS ADC with a serial (SPI-compatible) interface. The ADS7809U offers a faster sampling rate and parallel output, whereas the ADS7813UB/1K trades throughput for a serial interface and lower power consumption. Both are offered in SOIC packages but differ in pinout and interface architecture.
Are the ADS7809U and ADS7813UB/1K pin-compatible?
No. The ADS7809U uses a parallel data bus with a different pinout than the serial interface of the ADS7813UB/1K. They are not drop-in replacements and require different PCB layouts and host interface wiring.
What are the maximum sampling rates of these two ADCs?
The ADS7809U supports a maximum throughput of 100 kSPS. The ADS7813UB/1K supports a maximum throughput of 40 kSPS. Designs requiring higher sample rates should account for this difference.
What interface types do the ADS7809U and ADS7813UB/1K provide?
The ADS7809U provides a parallel digital output interface, suitable for direct connection to a microprocessor bus. The ADS7813UB/1K provides a serial interface compatible with SPI and similar synchronous serial hosts, reducing pin count and board routing complexity.
Do both parts offer the same resolution and input range?
Both are 16-bit ADCs. The ADS7809U offers a selectable input range of ±10 V, ±5 V, 0 to 10 V, and 0 to 5 V. The ADS7813UB/1K offers a ±10 V input range. Designers should verify the exact input configuration against the respective datasheets for their application.
How do power consumption figures compare between the ADS7809U and ADS7813UB/1K?
The ADS7813UB/1K is specified for lower power operation, typically around 100 mW, making it suitable for power-sensitive designs. The ADS7809U consumes more power due to its higher throughput and parallel interface. Exact supply current and power figures should be confirmed from the manufacturer datasheets for the specific grade and operating conditions.
Can the ADS7813UB/1K be used as a replacement for the ADS7809U in an existing design?
No, not without redesign. The differing interface (serial versus parallel), pinout, package footprint, and maximum sampling rate mean the ADS7813UB/1K cannot directly replace the ADS7809U. The host firmware, PCB layout, and timing must be revalidated if a substitution is considered.
What package options are available for these two ADCs?
Both the ADS7809U and ADS7813UB/1K are offered in SOIC packages. The "U" suffix in ADS7809U and the "UB" suffix in ADS7813UB/1K denote SOIC package variants. Designers should confirm the exact package outline and thermal characteristics from the respective datasheets before finalizing the layout.