ADC78H89CIMTX - 7-Channel 12-Bit 500kSPS SAR ADC | TI
MPN： ADC78H89CIMTX ✓ 啟用中ADC78H89CIMTX 概覽
An ADC (analog-to-digital converter) is a data-acquisition integrated circuit that converts continuous analog signals into discrete digital codes; SAR ADCs use a binary-search capacitor network to resolve each conversion in N clock cycles, making them well-suited for multiplexed multi-channel systems where low latency and deterministic behavior are required. The ADC78H89 sits in the broader hierarchy of SAR ADC -> data converter -> data acquisition IC -> signal chain IC -> semiconductor. Multi-channel SAR ADCs like this one are commonly used to digitize several sensor or control signals through a single serial port, reducing MCU pin count and BOM cost.
Key specifications include 12-bit resolution, a 500 kSPS conversion rate, seven analog input channels, an internal track-and-hold circuit, single-supply operation from 2.7 V to 5.25 V, and a straight-binary serial data output. The architecture supports pseudo-differential or single-ended inputs and includes a hardware shutdown pin to reduce current consumption between conversions, which is important for battery-powered and thermally-constrained designs.
The SAR core is paired with an on-chip input multiplexer, sample-and-hold amplifier, and an SPI/QSPI/MICROWIRE-compatible serial I/O block. The internal reference and clock options reduce external component count, while the TSSOP-16 footprint allows the part to be placed in compact multiplexed sensor front ends. Typical SNR and INL behavior of this family is suitable for general-purpose 12-bit precision instrumentation rather than audio or 16+ bit precision.
Typical applications include multi-sensor data acquisition in industrial control, battery monitoring in portable instrumentation, HVAC and appliance sensor aggregation, microcontroller-based measurement nodes, and general-purpose multi-channel instrumentation. Designers select this ADC when 12-bit accuracy, seven channels, and SPI connectivity are sufficient and lowest-cost general-purpose conversion is desired.
When designing with the ADC78H89CIMTX, ensure that the analog supply is well decoupled (typically a 10 µF bulk plus 0.1 µF ceramic close to AVDD), that the SCLK frequency respects the 500 kSPS timing budget across all seven channels, and that the CS/SHUTDOWN logic is sequenced correctly to enter low-power shutdown between conversions.
This page synthesizes distributor pricing, drop-in alternative MPNs, datasheet pinout, and practical design notes that are not consolidated on a single manufacturer or distributor page, giving engineers a single source for evaluation and BOM decision making.
直接替換替代品，適用於 ADC78H89CIMTX — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： ADC78H89CIMTX （相同外形與佔位） — 差異在於 Input Type, Interface, Number of Input Channels, Package, Resolution.
ADC78H89CIMTX/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
ADC78H89CIMT
✅ 直接替換聯絡詢價
查看資料表 →ADC78H89CIMT/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
ADC78H89CIMTX 最大額定值與電氣特性
| 解析度 | 12 bits |
| Number of Input Channels | 7 |
| Conversion Rate (max) | 500 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Single-ended (pseudo-differential option) |
| 供應電壓 | 2.7 V to 5.25 V |
| Analog Input Voltage Range | 0 V to VREF (or 0 V to AVDD with internal ref) |
| 介面 | SPI / QSPI / MICROWIRE-compatible serial |
| Output Data Format | Straight binary |
| Reference | Internal (with VDD-based reference option) |
| 工作溫度範圍 | -40 °C to +85 °C |
| 封裝 | 16-pin TSSOP (PW) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (NOPB suffix confirms lead-free) |
ADC78H89CIMTX 腳位配置
| 腳位 1 | AIN1 — Analog input channel 1 |
| 腳位 2 | AIN2 — Analog input channel 2 |
| 腳位 3 | AIN3 — Analog input channel 3 |
| 腳位 4 | AIN4 — Analog input channel 4 |
| 腳位 5 | AIN5 — Analog input channel 5 |
| 腳位 6 | AIN6 — Analog input channel 6 |
| 腳位 7 | AIN7 — Analog input channel 7 |
| 腳位 8 | AGND — Analog ground |
| 腳位 9 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| 腳位 10 | SHDN — Shutdown / hardware power-down input |
| 腳位 11 | DGND — Digital ground |
| 腳位 12 | DVDD — Digital supply voltage |
| 腳位 13 | CS — Chip-select / serial-interface enable |
| 腳位 14 | SCLK — Serial-interface clock |
| 腳位 15 | DOUT — Serial data output |
| 腳位 16 | DIN — Serial data input (control-word) |
典型應用
ADC78H89CIMTX 適用於 6 應用s: Multi-Sensor Industrial Control, Battery Monitoring in Portable Instrumentation, HVAC and Appliance Sensor Aggregation, General-Purpose Multi-Channel Instrumentation, Microcontroller-Based Measurement Nodes, Automotive Body and Comfort Sensor Reading.
Multi-Sensor Industrial Control
The ADC78H89CIMTX is a strong fit for multi-sensor industrial control boards that digitize seven analog process variables (temperature, pressure, flow, level, current, voltage, and a discrete analog feedback) through a single SPI port. Its 500 kSPS throughput allows the full seven-channel scan to complete inside one control-loop period, while its 2.7 V–5.25 V supply range accepts 3.3 V or 5 V industrial rails. The on-chip multiplexer and SAR core eliminate the need for external analog switches, reducing BOM cost in PLC and sensor-hub designs.
推薦
Battery Monitoring in Portable Instrumentation
In handheld meters and portable test equipment, the ADC78H89CIMTX digitizes battery voltage, pack current sense, cell temperature, and four additional analog signals with a single low-power 12-bit ADC. The internal track-and-hold and SPI interface keep MCU pin count low, while the wide 2.7 V–5.25 V supply range supports direct connection to single Li-ion or 3-cell alkaline stacks. The seven-channel mux lets designers consolidate multiple discrete ADCs into one TSSOP-16 footprint for compact, battery-friendly layouts.
推薦
HVAC and Appliance Sensor Aggregation
HVAC controllers and white-goods appliances typically aggregate several analog sensors (room temperature, coil temperature, humidity, fan RPM voltage, setpoint potentiometer, and two more). The ADC78H89CIMTX's seven single-ended inputs match this count exactly, so no analog mux is needed externally. The 500 kSPS throughput exceeds the few-Hz scan rate that HVAC loops require, and the −40 °C to +85 °C operating range covers appliance and outdoor-unit environments.
推薦
General-Purpose Multi-Channel Instrumentation
Bench instruments and data loggers that need seven analog input channels benefit from the ADC78H89CIMTX's SAR architecture, which provides no-pipeline-delay conversion and deterministic latency per channel. The straight-binary SPI output streams directly into an FPGA or MCU FIFO without post-processing, simplifying the data path. Designers get 12-bit resolution, suitable for general-purpose voltage and transducer readout rather than precision 16-bit metrology, in a TSSOP-16 footprint.
推薦
Microcontroller-Based Measurement Nodes
Distributed measurement nodes in IoT and building-automation networks use small MCUs connected to a few analog sensors; the ADC78H89CIMTX lets one MCU handle up to seven analog channels via a single SPI peripheral. Its 12-bit resolution is adequate for sensor-trend logging and threshold alarming, and the shutdown pin enables sub-microamp idle current between conversions to preserve battery life. The TSSOP-16 package fits the small PCB footprints typical of these nodes.
推薦
Automotive Body and Comfort Sensor Reading
Non-safety automotive body controllers (HVAC, seat, mirror, interior lighting) often require reading several analog sensors over a small SPI interface. The ADC78H89CIMTX's seven-channel input and 500 kSPS throughput cover these use cases, though designers must verify AEC-Q100 qualification status with TI for their target subsystem. The TSSOP-16 footprint suits compact body-controller modules, and the 2.7 V–5.25 V supply aligns with automotive 5 V rails.
推薦
推薦產品摘要
工程參考資料，適用於 ADC78H89CIMTX — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | ADC78H89CIMTX/NOPB | ADC78H89CIMT | ADC78H89CIMT/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-TSSOP (PW) | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same | 16-TSSOP (PW) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits |
| Number of Channels | 7 | 7 | 7 | 7 |
| Sampling Rate (max) | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS |
| Architecture | SAR | SAR | SAR | SAR |
| Interface | SPI | SPI | SPI | SPI |
| Supply Voltage | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V | 2.7 V to 5.25 V |
| Lead-Free / RoHS | Check part marking (NOPB suffix confirms Pb-free) | Yes (NOPB suffix) | Check part marking | Yes (NOPB suffix) |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
主要差異化特點
- Exact seven single-ended analog input channels with internal multiplexer (對比ADC78H89CIMTX/NOPB)
- Direct 3.3 V SPI compatibility without level translation (對比ADC78H89CIMT)
- RoHS-compliant ordering option in the same family (對比ADC78H89CIMT/NOPB)
設計說明
Decouple AVDD with a 10 µF bulk capacitor plus a 0.1 µF ceramic placed within 5 mm of the AVDD pin. DVDIO for the serial interface may be tied to the same supply as the host MCU's I/O rail. Drive the SHDN pin low during long idle intervals to reduce current consumption between conversion bursts.
Keep the analog input traces short and routed away from the SCLK/DOUT digital lines to avoid coupling digital switching noise into the SAR sampling network. Place a ground pour under the ADC78H89CIMTX body to reduce pin-to-pin capacitive coupling, and star-ground AGND and DGND at a single point near the IC for best 12-bit noise performance.
Do not exceed the 5.25 V absolute maximum on AVDD or DVDD. Ensure SCLK does not exceed the maximum frequency listed in the datasheet timing table at the chosen AVDD, since SAR aperture timing is supply-dependent. Verify the channel-configuration command word is written to DIN before reading DOUT on each conversion cycle per the serial-interface timing diagram.
合規資訊
NOPB suffix on the family confirms Pb-free / RoHS compliance. AEC-Q100 qualification status was not stated in the verified web data and is marked unknown — confirm with TI for automotive safety applications.
