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 ADS7806U are not drop-in replacements for one another. The ADS7830IPWR is an 8-bit, 8-channel SAR ADC with an I2C interface in a TSSOP-16 package, while the ADS7806U is a 12-bit, single-channel SAR ADC with a parallel interface in an SOIC-28 package. They differ in resolution, channel count, digital interface, and package footprint, so substituting one for the other requires a full redesign of the surrounding circuitry and layout.
Different resolution
Different channel count
Different digital interface
Different package footprint
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 | ADS7806U | Why it matters |
|---|---|---|---|
| Resolution | 8 bit | 12 bit | Resolution determines the smallest measurable voltage step; a 12-bit ADC provides 16x finer quantization than an 8-bit ADC, affecting measurement accuracy. |
| Number of Input Channels | 8 (single-ended), 4 (differential) | 1 (single-ended) | Channel count defines how many analog signals can be multiplexed into one converter; the ADS7830 supports multi-channel systems while the ADS7806 handles a single input. |
| Sampling Rate | 70 kSPS | 40 kSPS | Maximum sampling rate limits the bandwidth of signals that can be digitized; a faster rate supports higher-frequency inputs. |
| Interface Type | I2C | Parallel (byte/word) | The digital interface must match the host controller; I2C uses fewer pins while parallel offers higher throughput and simpler timing. |
| Input Type | Single-ended / Differential | Single-ended | Differential inputs improve noise immunity and reject common-mode signals, which single-ended inputs cannot do. |
| Supply Voltage | 2.7 V to 5.5 V | 5 V (single supply) | Supply range determines compatibility with low-voltage logic and battery-powered systems; the ADS7830 is more flexible across 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. |
| Reference Type | External (internal shutdown) | Internal | An internal reference simplifies design and saves board space, while an external reference allows higher accuracy or ratiometric configurations. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | The temperature range indicates suitability for industrial environments; both parts cover the same industrial-grade range. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS7830IPWR | ADS7806U |
|---|---|---|
| Supplier | - | Rochester Electronics, LLC,Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 8 | 12 |
| Sampling Rate(Per Second) | 70k | 40k |
| Number of Inputs | 4, 8 | 1 |
| Input Type | Differential, Single Ended | Single Ended |
| Data Interface | I²C | SPI, 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 | -40°C ~ 85°C |
Frequently asked questions
What are the key architectural differences between the ADS7830IPWR and the ADS7806U?
The ADS7830IPWR is an 8-bit, 8-channel successive-approximation register (SAR) analog-to-digital converter with an I2C-compatible serial interface, operating from a single 2.7 V to 5.5 V supply. The ADS7806U is a 12-bit SAR ADC with a parallel byte-wide interface, featuring a 12-bit resolution and operating from a single 5 V supply with an internal reference and sample-and-hold circuit. The two devices differ fundamentally in resolution (8-bit vs. 12-bit), interface type (I2C vs. parallel), channel count (8-channel multiplexed vs. single-channel), and supply voltage requirements.
Can the ADS7830IPWR and ADS7806U be used interchangeably in an existing design?
No. The ADS7830IPWR and ADS7806U are not pin-compatible or functionally interchangeable. The ADS7830IPWR is packaged in a TSSOP-16 (PW package) with an I2C serial interface, while the ADS7806U is packaged in a SOIC-28 (DW package) with a parallel interface. They differ in resolution, channel count, supply voltage, and digital interface, so direct substitution without redesign is not possible.
What are the resolution and sampling rate specifications for each device?
The ADS7830IPWR provides 8-bit resolution with a maximum sampling rate of 70 kSPS (kilo-samples per second) per the manufacturer datasheet. The ADS7806U provides 12-bit resolution with a maximum sampling rate of 40 kSPS. The ADS7806U offers higher resolution but a lower throughput compared to the ADS7830IPWR.
How do the input configurations differ between the ADS7830IPWR and ADS7806U?
The ADS7830IPWR features an 8-channel input multiplexer that can be configured as single-ended or differential pairs, with a full-scale input range set by the supply voltage (0 V to VDD). The ADS7806U is a single-channel device with a full-scale input range of ±10 V (bipolar) or 0 V to 10 V (unipolar), configurable via external connections, and includes an internal sample-and-hold amplifier. The ADS7830IPWR is suited for multi-channel, low-resolution monitoring, while the ADS7806U targets high-resolution single-channel signal acquisition.
What are the supply voltage and power consumption characteristics of these ADCs?
The ADS7830IPWR operates from a single supply of 2.7 V to 5.5 V and typically consumes approximately 750 µA at 5 V with a 70 kSPS throughput, making it suitable for low-power portable applications. The ADS7806U operates from a single 5 V supply and typically consumes about 100 mW (approximately 20 mA), reflecting its higher-resolution 12-bit architecture and internal reference circuitry. The ADS7830IPWR is significantly more power-efficient for low-resolution applications.
What digital interfaces do the ADS7830IPWR and ADS7806U use?
The ADS7830IPWR uses an I2C-compatible 2-wire serial interface supporting standard, fast, and high-speed modes, with a 7-bit address selectable via the A0 pin. The ADS7806U uses a parallel 8-bit byte-wide interface with standard microprocessor control signals (CS, RD, and BYTE), allowing direct connection to parallel buses. The serial interface of the ADS7830IPWR reduces pin count and board routing, while the parallel interface of the ADS7806U provides higher data throughput per conversion cycle.
What are the package and operating temperature specifications for each part?
The ADS7830IPWR is supplied in a 16-pin TSSOP (PW) package and is specified for operation over the industrial temperature range of −40°C to +85°C. The ADS7806U is supplied in a 28-pin SOIC (DW) package and is specified for operation over the industrial temperature range of −40°C to +85°C. Both devices are RoHS-compliant per their respective manufacturer documentation.
Which device is better suited for multi-channel data acquisition versus high-precision measurement?
The ADS7830IPWR is better suited for multi-channel data acquisition because its 8-channel multiplexer and I2C interface allow monitoring of multiple signals with minimal pin count and low power, albeit at 8-bit resolution. The ADS7806U is better suited for high-precision single-channel measurement because its 12-bit resolution, internal sample-and-hold, and ±10 V input range provide greater accuracy and dynamic range for applications such as industrial process control and instrumentation.