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 ADS7809U and ADS7800JU/1K are both 12-bit successive-approximation ADCs in a 28-pin SOIC package with a parallel interface, making them a viable functional replacement candidate. However, the ADS7809U operates from a single 5 V supply with an internal reference and a 10 µs conversion time, while the ADS7800JU/1K requires dual ±5 V supplies with a 3 µs conversion time, so power supply architecture and timing must be validated before substitution.
Resolution
High match
Package Type
High match
Supply Voltage
Validation required
Conversion Time
Validation required
Parts at a glance
Part B
ADS7800JU/1K
德州儀器
- Lifecycle
- Active
- Stock
- 4118 件
- Package
- SOIC-24
- 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 | ADS7800JU/1K | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest analog change the ADC can distinguish; a 16-bit part offers far finer quantization than a 12-bit part, so they are not drop-in substitutes where accuracy is critical. |
| Sampling Rate | 100 kSPS | 333 kSPS | Maximum throughput limits the bandwidth of signals that can be digitized; the ADS7800 samples faster, 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. |
| Interface | Serial (SPI/QSPI compatible) | Parallel | The digital interface dictates the host connection and pin count; a serial device cannot directly replace a parallel device without a redesign of the digital bus. |
| Supply Voltage | 5 V | 5 V | Supply voltage must match the system rail; both operate from a single 5 V supply, simplifying power-rail compatibility. |
| Package | 28-pin SOIC | 24-pin SOIC | Package and pin count determine board footprint and layout; different pin counts mean the parts are not footprint-compatible and require separate PCB designs. |
| Reference | Internal reference | Internal reference | An internal reference simplifies the design by removing an external reference component; both include one, easing analog design. |
| 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; matching industrial ranges support similar application conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7809U | ADS7800JU/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 100k | 333k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI, DSP | 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 | Internal |
| Voltage - Supply, Analog | 5V | 5V, -11.4V ~ 16.5V |
| 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 ADS7800JU/1K?
The ADS7809U is a 16-bit successive-approximation ADC with a serial (SPI-compatible) interface, while the ADS7800JU/1K is a 12-bit successive-approximation ADC with a parallel interface. The ADS7809U offers higher resolution (16-bit vs 12-bit) and a serial output, whereas the ADS7800JU/1K provides a parallel data bus and lower resolution. Both are single-channel, monolithic ADCs from Texas Instruments (Burr-Brown), but they differ in resolution, interface type, and package.
Are the ADS7809U and ADS7800JU/1K pin-compatible or package-compatible?
No. The ADS7809U is supplied in a 28-pin SOIC (DW) package, while the ADS7800JU/1K is supplied in a 24-pin SOIC (DW) package. The pin counts and pin functions differ, so they are not drop-in replacements and require different PCB footprints.
What are the resolution and sampling specifications of each device?
The ADS7809U provides 16-bit resolution with a maximum sampling rate of 100 kSPS. The ADS7800JU/1K provides 12-bit resolution with a maximum sampling rate of 333 kSPS. The ADS7800JU/1K therefore offers a higher throughput but lower resolution, while the ADS7809U offers higher resolution at a lower sampling rate.
What digital interface does each ADC use?
The ADS7809U uses a serial interface compatible with SPI and similar synchronous serial protocols, outputting data on a single serial data line with frame synchronization. The ADS7800JU/1K uses a parallel interface with a 12-bit-wide data bus plus control and status lines. System designers must account for this difference in microcontroller or FPGA I/O requirements.
What are the analog input ranges and supply requirements for these devices?
Both devices operate from a +5 V analog supply and support bipolar analog input ranges of ±10 V and ±5 V, configured via external connections. The ADS7809U additionally supports a unipolar 0 V to +10 V input range. Both require an external reference or use their internal reference depending on configuration; designers should consult the respective datasheets for exact reference and decoupling requirements.
Can the ADS7809U directly replace the ADS7800JU/1K in an existing design?
No. Because the two devices differ in resolution (16-bit vs 12-bit), interface type (serial vs parallel), package pin count (28-pin vs 24-pin), and sampling rate, a direct replacement is not possible. Any substitution requires a redesign of the digital interface, PCB footprint, and validation of the analog signal chain against the target system requirements.
Which device is better suited for high-resolution, low-speed measurement applications?
The ADS7809U is better suited for high-resolution, lower-speed applications because it provides 16-bit resolution at up to 100 kSPS, making it appropriate for precision instrumentation, data acquisition, and industrial measurement systems where accuracy is prioritized over throughput. The ADS7800JU/1K, with 12-bit resolution and up to 333 kSPS, is better suited for faster, lower-resolution applications.
Are both devices available as RoHS-compliant parts, and what is the significance of the "U" and "JU/1K" suffixes?
The "U" suffix on the ADS7809U denotes a SOIC package in Texas Instruments' nomenclature. The "JU" on the ADS7800JU/1K denotes a commercial temperature-range SOIC device, and the "/1K" indicates tape-and-reel packaging in quantities of 1,000 units. Designers should verify the specific orderable part number and RoHS status on the manufacturer's or authorized distributor's product page before procurement, as packaging and compliance designations can vary by orderable variant.