Part A
ADS7830IPWR
德州儀器
- Lifecycle
- Active
- Stock
- 1661 件
- Package
- TSSOP-16
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Not a drop-in replacement
The ADS7830IPWR and ADS7805UB/1K are not functionally interchangeable. The ADS7830IPWR is an 8-bit, 8-channel SAR ADC with an I2C serial interface in a TSSOP-16 package, while the ADS7805UB/1K is a 16-bit, single-channel SAR ADC with a parallel interface in a SOIC-28 package. The differences in resolution, channel count, digital interface, and package footprint make direct substitution infeasible without a complete redesign of the surrounding circuitry and PCB layout.
Different resolution
Different channel count
Different digital interface
Different package footprint
Parts at a glance
Part B
ADS7805UB/1K
德州儀器
- Lifecycle
- Active
- Stock
- 148 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 | ADS7830IPWR | ADS7805UB/1K | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 16 bit | Resolution determines the smallest analog voltage change the ADC can distinguish; a 16-bit part offers far finer measurement granularity than an 8-bit part. |
| Number of Input Channels | 8 (single-ended, multiplexed) | 1 (single-ended) | Channel count defines how many analog signals can be measured; the multiplexed 8-channel part suits multi-signal monitoring while the single-channel part suits one dedicated input. |
| Sampling Rate | 70 kSPS | 100 kSPS | Maximum sample rate limits the bandwidth of signals that can be digitized; higher rates support faster-changing inputs. |
| Interface Type | I2C | Parallel | The digital interface must match the host system; I2C uses fewer pins while a parallel interface offers higher throughput and simpler timing. |
| Input Type | Single-ended | Single-ended | Input configuration affects how signals are referenced and connected; both parts accept single-ended inputs here. |
| Supply Voltage | 2.7 V to 5.5 V | 5 V (single supply) | Supply range determines compatibility with the system power rail; the wider-range part can operate on lower-voltage rails. |
| Package | TSSOP-16 | SOIC-28 | Package footprint and pin count affect PCB layout and board space; these parts are not drop-in compatible. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range indicates environmental suitability; both parts cover the industrial temperature range. |
| Reference | External (internal reference option) | Internal | Reference configuration affects accuracy and external component count; an internal reference simplifies design while external references allow custom scaling. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7830IPWR | ADS7805UB/1K |
|---|---|---|
| Supplier | - | Texas Instruments,Rochester Electronics, LLC |
| Part Status | Active | Active |
| Number of Bits | 8 | 16 |
| Sampling Rate(Per Second) | 70k | 100k |
| Number of Inputs | 4, 8 | 1 |
| Input Type | Differential, Single Ended | Single Ended |
| Data Interface | I²C | Parallel |
| Configuration | MUX-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 | 2.7V ~ 3.6V, 5V | 5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V, 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -25°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS7830IPWR and the ADS7805UB/1K?
The ADS7830IPWR is an 8-bit, 8-channel successive-approximation register (SAR) analog-to-digital converter with an I2C-compatible serial interface, housed in a TSSOP-16 package. The ADS7805UB/1K is a 16-bit SAR ADC with a parallel data interface, offering a single channel with a ±10 V input range, housed in a SOIC-28 package. The two devices differ fundamentally in resolution, channel count, interface type, and package footprint.
Can the ADS7830IPWR be used as a direct drop-in replacement for the ADS7805UB/1K?
No. The ADS7830IPWR and ADS7805UB/1K are not pin-compatible or functionally interchangeable. They differ in package type (TSSOP-16 vs SOIC-28), resolution (8-bit vs 16-bit), interface (I2C vs parallel), channel count (8-channel vs single-channel), and analog input range. A direct substitution is not possible without a complete redesign of the surrounding circuitry and PCB layout.
What are the analog input voltage ranges for each device?
The ADS7830IPWR operates with an analog supply (VDD) from 2.7 V to 5.25 V and its input range is 0 V to VDD, with the reference derived from the supply voltage. The ADS7805UB/1K features a bipolar ±10 V analog input range and requires external ±15 V and +5 V supplies for proper operation. The input ranges are therefore not compatible without additional signal conditioning.
How do the sampling rates of the ADS7830IPWR and ADS7805UB/1K compare?
The ADS7830IPWR supports a maximum sampling rate of 70 kSPS (kilo-samples per second) per the manufacturer datasheet. The ADS7805UB/1K offers a maximum throughput of 100 kSPS. Both are SAR-type converters, but the ADS7805UB/1K provides higher resolution at a slightly higher sampling rate.
What interface types do these two ADCs use, and how does that affect system design?
The ADS7830IPWR uses an I2C-compatible two-wire serial interface, which minimizes pin count and simplifies connection to microcontrollers with limited I/O. The ADS7805UB/1K uses a parallel 16-bit data bus interface, requiring more I/O pins but offering higher data throughput per conversion cycle. System designers must account for these interface differences when selecting a host processor and planning PCB routing.
What are the supply voltage requirements for the ADS7830IPWR and ADS7805UB/1K?
The ADS7830IPWR operates from a single analog supply (VDD) of 2.7 V to 5.25 V and a digital supply (VIO) of 2.7 V to 5.25 V. The ADS7805UB/1K requires +5 V digital and analog supplies plus ±15 V supplies for its internal bipolar input circuitry. The ADS7805UB/1K therefore demands a more complex power supply design compared to the single-supply ADS7830IPWR.
In which application scenarios would each device be preferred?
The ADS7830IPWR is suited for multi-channel, low-power, space-constrained applications such as battery-powered instrumentation, portable data loggers, and system monitoring where an I2C bus is available and 8-bit resolution is sufficient. The ADS7805UB/1K is appropriate for high-resolution, single-channel industrial measurement systems requiring 16-bit accuracy and bipolar ±10 V input capability, such as industrial process control and precision data acquisition.
Do the ADS7830IPWR and ADS7805UB/1K share the same operating temperature range?
Both devices are specified for the industrial temperature range of −40 °C to +85 °C per their respective manufacturer datasheets. However, designers should verify the specific grade suffix and datasheet revision for the exact ordering part number to confirm the rated temperature range for the intended application.