Part A
ADS7830IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 1661 Stückzahl
- Package
- TSSOP-16
- Series
- Datenerfassung mit Analog to Digital Converters (ADC)
Replacement verdict
Not a drop-in replacement
The ADS7830IPWR and ADS7805U/1K are not functionally interchangeable: the ADS7830IPWR is an 8-bit, 8-channel I²C SAR ADC in a TSSOP-16 package, while the ADS7805U/1K is a 16-bit, single-channel parallel SAR ADC in an SOIC-28 package. The differences in resolution, channel count, digital interface, and package footprint make direct substitution impractical without a full system redesign.
Different resolution
Different channel count
Different digital interface
Different package footprint
Parts at a glance
Part B
ADS7805U/1K
Texas Instruments
- Lifecycle
- Active
- Stock
- 8464 Stückzahl
- Package
- SOIC-28
- Series
- Datenerfassung mit Analog to Digital Converters (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 | ADS7805U/1K | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 16 bit | Resolution determines the smallest measurable signal step; a 16-bit ADC provides far finer quantization than an 8-bit device, so they are not functionally interchangeable in precision applications. |
| Number of Input Channels | 8 (single-ended, multiplexed) | 1 (single-ended) | Channel count defines how many analog signals can be digitized; the ADS7830 supports multi-channel scanning while the ADS7805 handles only one input. |
| Sampling Rate | 70 kSPS | 100 kSPS | Maximum throughput affects the bandwidth of signals that can be captured; the ADS7805 samples faster, which matters for higher-frequency or time-critical acquisition. |
| Interface Type | I2C (2-wire) | Parallel (byte/word) | The digital interface must match the host controller; I2C uses fewer pins and supports bus sharing, while a parallel interface offers higher data throughput and different board routing. |
| Input Type / Range | Single-ended, 0 to VDD (supply-referenced) | Single-ended, bipolar ±10 V range | Input range and configuration determine signal compatibility; the ADS7805 accepts bipolar ±10 V signals directly, whereas the ADS7830 requires unipolar signals within its supply rails. |
| Supply Voltage | 2.7 V to 5.5 V | 5 V (single supply, with ±10 V input range) | Supply requirements affect system power design and logic-level compatibility; the wide-supply ADS7830 suits low-voltage systems, while the ADS7805 targets 5 V designs. |
| Package | TSSOP-16 | SOIC-28 | Package footprint and pin count dictate PCB layout and cannot be swapped without a board redesign. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range must cover the application environment; both parts share the same industrial range, so this parameter does not differentiate them. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7830IPWR | ADS7805U/1K |
|---|---|---|
| Supplier | - | Texas Instruments |
| 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 ADS7805U/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 ADS7805U/1K is a 16-bit SAR ADC with a parallel byte interface, internal sample-and-hold, and a 10 µs conversion time, offered in a SOIC-28 package. The two devices differ fundamentally in resolution, channel count, interface type, and package footprint.
Can the ADS7830IPWR and ADS7805U/1K be used as direct substitutes for each other?
No. The ADS7830IPWR provides 8-bit resolution over 8 multiplexed input channels via an I2C interface in a TSSOP-16 package, while the ADS7805U/1K provides 16-bit resolution on a single channel via a parallel interface in a SOIC-28 package. Differences in resolution, interface protocol, pin count, and package footprint prevent direct substitution without a complete redesign of the digital interface and PCB layout.
What are the supply voltage and reference requirements for each device?
The ADS7830IPWR operates from a single 2.7 V to 5.5 V supply and can use its supply voltage or an external reference on the VREF pin. The ADS7805U/1K operates from a +5 V supply with a built-in 2.5 V reference and also supports an external reference. Designers must verify the reference configuration and supply tolerances against the respective datasheets before finalizing the analog front end.
How do the sampling rates and conversion characteristics compare?
The ADS7830IPWR supports a maximum sampling rate of 70 kSPS with I2C clock rates up to 400 kHz. The ADS7805U/1K offers a 10 µs maximum conversion time, corresponding to a 100 kSPS throughput, with a parallel byte interface for faster data retrieval. The ADS7805U/1K is therefore better suited to higher-resolution, higher-throughput single-channel applications, while the ADS7830IPWR targets multi-channel, lower-resolution monitoring tasks.
What input signal ranges and configurations do these ADCs support?
The ADS7830IPWR accepts single-ended or differential inputs on its 8 channels, with the input range determined by the applied reference voltage. The ADS7805U/1K accepts a ±10 V bipolar input range with its internal reference and provides a 16-bit two's complement output. Engineers must confirm the input span and configuration against the target sensor or signal chain before selecting either device.
Which device is more appropriate for multi-channel system monitoring?
The ADS7830IPWR is more appropriate for multi-channel system monitoring because it integrates an 8-channel input multiplexer with a 2-wire I2C interface, reducing pin count and board space. The ADS7805U/1K is a single-channel, 16-bit converter intended for precision measurement of one signal at a time and requires a parallel bus for data transfer.
What are the operating temperature ranges for the ADS7830IPWR and ADS7805U/1K?
The ADS7830IPWR is specified for operation over the −40 °C to +85 °C industrial temperature range. The ADS7805U/1K is specified over the −40 °C to +85 °C temperature range as well. Both devices are therefore suitable for industrial-grade environments, but designers should confirm the exact grade suffix and datasheet limits for the specific orderable part number.
How do the digital interfaces affect system design when choosing between these parts?
The ADS7830IPWR uses an I2C-compatible 2-wire interface, which minimizes pin count and allows multiple devices to share a bus, making it suitable for space-constrained, multi-sensor systems. The ADS7805U/1K uses a parallel byte interface with separate data lines, which provides higher data throughput but requires more microcontroller or FPGA I/O pins. The interface choice directly impacts board layout, pin budget, and firmware complexity.