ADC78H89CIMT - 7-Ch 500kSPS 12-Bit SAR ADC | Texas Instruments
料号： ADC78H89CIMT ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.85 | $48.50 |
| 100 | $4.1 | $410.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $2.95 | $2,950.00 |
ADC78H89CIMT 概述
A SAR ADC is a type of data converter that performs a binary search across an internal capacitive DAC to resolve each analog sample in N clock cycles, where N is the resolution. The SAR architecture combines deterministic latency with inherent anti-alias filtering and is widely used in multiplexed data-acquisition systems, motor control loops, and instrumentation front-ends. SAR converters sit within the broader hierarchy of analog-to-digital converters (ADC -> data converter -> signal chain IC -> semiconductor) and trade the continuous-time linearity of delta-sigma ADCs for true single-shot sampling and low power dissipation.
Key features of the ADC78H89CIMT include ±1 LSB maximum DNL and ±1 LSB maximum INL, an operating temperature range of -40 °C to +85 °C, and very low power consumption: typically 1.5 mW at 3 V supply and 8.3 mW at 5 V supply. The 16-pin TSSOP footprint offers a small board area suitable for portable or space-constrained designs, while the internal track-and-hold and serial interface minimize external component count.
The device operates from a 2.7 V to 5.25 V analog supply, supporting both 3 V and 5 V system rails. The SAR core, internal reference option, and seven-channel input multiplexer make the part a single-chip solution for sensor-array digitizing where deterministic latency and low power are more important than raw conversion speed. Designers can run the part from an external clock or the internal oscillator depending on system timing constraints.
Typical applications include automotive navigation and infotainment subsystems, portable battery-powered instruments, medical instrumentation such as patient-monitoring front-ends, mobile-communication baseband signal-conditioning, and general-purpose industrial instrumentation and control systems. Its low power also suits remote, solar-powered sensor nodes.
A key design consideration is that the /CS, SCLK, DOUT, and DIN pins form the four-wire serial interface, and the AIN0-AIN6 pins share a common ground reference. Decouple AVDD with a 10 µF and 0.1 µF pair placed within 5 mm of the supply pin, and keep digital return currents isolated from the analog ground return to preserve the device's specified DNL/INL.
This page consolidates distributor pricing, drop-in TSSOP-16 alternatives, and practical design guidance that are not available in the manufacturer's datasheet alone.
直接替换替代料： ADC78H89CIMT ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ADC78H89CIMT （相同外形与封装尺寸） ——差异在于 Number of Input Channels, Package, RoHS Status, Input Type, Operating Temperature Range.
快速对比工具——选择替代料号进行并排对比：
ADC78H89CIMT/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
ADC78H89CIMTX
✅ 直接替换✓ 有现货
$2.3 / 个
查看数据手册 →ADC78H89CIMTX/NOPB
✅ 直接替换📋 参考替代料（不在目录中）
ADC128S052CIMT
✅ 直接替换 ⚠️ 规格未核验✓ 有现货
$2.13 / 个
查看数据手册 →ADC78H89CIMT 最大额定值与电气特性
| 分辨率 | 12 bit |
| Number of Input Channels | 7 (single-ended) |
| Conversion Rate | 500 kSPS |
| Architecture | SAR (Successive Approximation Register) |
| DNL (max) | ±1 LSB |
| INL (max) | ±1 LSB |
| Analog Supply Voltage | 2.7 V to 5.25 V |
| Digital Supply Voltage | 1.8 V to AVDD |
| Power Consumption (3 V) | 1.5 mW (typ) |
| Power Consumption (5 V) | 8.3 mW (typ) |
| Input Type | Single-ended (AIN1-AIN7) |
| 接口 | Serial SPI/QSPI/MICROWIRE-compatible |
| 工作温度 | -40 °C to +85 °C |
| 封装 | 16-pin TSSOP (MT) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant (NOPB suffix) |
ADC78H89CIMT 引脚配置
| 引脚 1 | AIN1 — Analog input channel 1 (single-ended) |
| 引脚 2 | AIN2 — Analog input channel 2 (single-ended) |
| 引脚 3 | AIN3 — Analog input channel 3 (single-ended) |
| 引脚 4 | AIN4 — Analog input channel 4 (single-ended) |
| 引脚 5 | AIN5 — Analog input channel 5 (single-ended) |
| 引脚 6 | AIN6 — Analog input channel 6 (single-ended) |
| 引脚 7 | AIN7 — Analog input channel 7 (single-ended) |
| 引脚 8 | DGND — Digital ground return |
| 引脚 9 | AVDD — Analog supply voltage (2.7 V to 5.25 V) |
| 引脚 10 | REF — Voltage reference input/decoupling (per datasheet) |
| 引脚 11 | CS — Chip select, active low (serial interface) |
| 引脚 12 | DOUT — Serial data output (SPI) |
| 引脚 13 | DIN — Serial data input (SPI) |
| 引脚 14 | SCLK — Serial clock input (SPI) |
| 引脚 15 | DVDD — Digital supply voltage (1.8 V to AVDD) |
| 引脚 16 | AGND — Analog ground return |
典型应用
ADC78H89CIMT 适用于 6 应用s: Automotive Navigation & Infotainment, Portable Battery-Powered Instruments, Medical Instrumentation Front-End, Mobile Communication Baseband Signal Conditioning, Industrial Instrumentation and Control Systems, Multi-Sensor Data Acquisition Modules.
Automotive Navigation & Infotainment
The ADC78H89CIMT is well suited for analog signal conditioning inside automotive navigation head units and infotainment modules that digitize multiple sensor rails. Its 7 single-ended input channels accept battery-current-sense, temperature-sensor, audio-level-detect, and backlight-feedback signals at a combined 500 kSPS aggregate throughput - more than sufficient for sub-100 kHz automotive sensor bandwidth. The 12-bit SAR core delivers deterministic conversion latency per channel, which simplifies sensor-fusion timing analysis, and the wide 2.7-5.25 V AVDD range covers both 3.3 V and 5 V analog rails found in body-electronics modules. Power dissipation is only 1.5 mW at 3 V, easing thermal budgets in sealed dashboard enclosures. The 16-pin TSSOP package is small enough to fit behind the LCD panel and uses standard surface-mount assembly compatible with automotive EMS lines.
推荐
Portable Battery-Powered Instruments
The ADC78H89CIMT's 1.5 mW typical dissipation at 3 V supply makes it a strong fit for portable, battery-powered data-acquisition instruments such as handheld multimeters, environmental loggers, and field-test gear. Seven input channels allow direct connection to thermocouple/thermistor bridges, photodiodes, and 4-20 mA loop shunts without an external analog multiplexer, while the SPI-compatible serial interface minimizes GPIO use on small microcontrollers. The -40 to +85 °C operating range covers outdoor industrial deployments, and the small TSSOP-16 footprint preserves board area for battery and display. Sleep-mode current (when /CS is held high) is sub-microamp, extending runtime between charge cycles. Designers should still budget a 0.1 µF + 10 µF AVDD decoupling pair within 5 mm of the supply pin.
推荐
Medical Instrumentation Front-End
The ADC78H89CIMT delivers 12-bit resolution and ±1 LSB DNL/INL that is well matched to medical instrumentation signal chains for low-frequency physiological signals. A typical patient-monitor front-end uses three to five of the seven channels for ECG leads, SpO2 photodiode current, respiration impedance, and skin-temperature inputs, with the remaining channels reserved for redundancy or alarm signals. The SAR architecture guarantees no-latency conversion per sample, which is critical for bedside monitors synchronizing with display refresh rates. Its low 1.5 mW dissipation at 3 V reduces thermal rise in wearable patches, and the SPI interface is straightforward to isolate with digital isolators for patient-safety creepage and clearance. The TSSOP-16 package is compatible with conformal-coated PCB assemblies used in medical devices.
推荐
Mobile Communication Baseband Signal Conditioning
Mobile baseband and RF front-end modules require digitizing RSSI, PA thermistor, and supply-current-shunt signals at moderate rates with deterministic latency. The ADC78H89CIMT's 500 kSPS throughput comfortably samples all seven such channels at aggregate rates well below 100 kSPS per channel, leaving substantial timing margin. Its SPI/QSPI/MICROWIRE-compatible interface lets it share a bus with the baseband DSP without glue logic, and its 2.7-5.25 V AVDD tolerance works directly from a 3.8 V Li-ion rail. The TSSOP-16 footprint eases placement between the RF shield and the PMIC. Use the SAR core's latency determinism to align PA-enable timing with RSSI measurements for closed-loop transmitter power control.
推荐
Industrial Instrumentation and Control Systems
PLC analog input modules, process-control transmitters, and HVAC controllers benefit from the ADC78H89CIMT's combination of seven single-ended inputs, 12-bit resolution, and 500 kSPS throughput. The device digitizes 4-20 mA loop shunts, RTD/thermistor bridges, 0-10 V process signals, and discrete digital-input voltages without an external analog multiplexer. Its 2.7-5.25 V supply range matches 24 V industrial bus rails after local regulation, and -40 to +85 °C operation tolerates factory-floor environments. The SAR architecture's deterministic latency simplifies IEC 61131-3 function-block timing, while the SPI interface is easy to galvanically isolate. The TSSOP-16 package fits standard 24-channel PLC sub-cards with multiple stacked converters on a single SPI bus.
推荐
Multi-Sensor Data Acquisition Modules
Modular data-acquisition cards for test-and-measurement, building automation, and environmental monitoring typically need 4-8 single-ended analog channels with 12-bit accuracy and modest sampling rates. The ADC78H89CIMT provides seven channels in a single TSSOP-16 IC, leaving board area for digital isolators, RS-485 transceivers, and DC-DC converters. With 500 kSPS aggregate throughput, the device can sample a thermocouple array at 50 kSPS/channel or a strain-gauge bridge array at 10 kSPS/channel with margin. Its SPI bus allows multiple ADC78H89s to share a single microcontroller SPI peripheral via separate /CS lines, doubling channel count without firmware complexity. The 1.5 mW / 3 V dissipation is ideal for solar or battery-powered remote telemetry units.
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推荐产品汇总
工程参考数据： ADC78H89CIMT ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ADC78H89CIMT/NOPB | ADC78H89CIMTX | ADC78H89CIMTX/NOPB | ADC128S052CIMT |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 16-pin TSSOP (MT) | 16-pin TSSOP (MT) - same | 16-pin TSSOP (MT) - same | 16-pin TSSOP (MT) - same | 16-pin TSSOP (MT) - same |
| Resolution | 12 bit | 12 bit | 12 bit | 12 bit | 12 bit |
| Number of Input Channels | 7 | 7 | 7 | 7 | 8 (+12.5%) |
| Conversion Rate | 500 kSPS | 500 kSPS | 500 kSPS | 500 kSPS | 200-500 kSPS |
| Architecture | SAR | SAR | SAR | SAR | SAR |
| Analog 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 | 2.7 V to 5.25 V |
| DNL / INL (max) | ±1 LSB / ±1 LSB | ±1 LSB / ±1 LSB | ±1 LSB / ±1 LSB | ±1 LSB / ±1 LSB | ±1 LSB / ±1 LSB (typ) |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
| Lifecycle Status | NRND | NRND | Active | Active | Active |
关键差异点
- Seven single-ended input channels in a 16-pin TSSOP - higher channel density than typical 4/8-channel 12-bit TSSOP SAR ADCs of the same era （对比 ADC128S052CIMT)
- Wide 2.7-5.25 V analog supply supports direct connection to both 3.3 V and 5 V rails without level translation （对比 ADS7952SBDBT)
- Low 1.5 mW dissipation at 3 V supply is ideal for battery-powered portable instruments （对比 Generic 12-bit 1 MSPS SAR ADCs)
设计说明
Power the ADC78H89CIMT from a clean AVDD rail with a 10 µF bulk + 0.1 µF ceramic decoupling pair placed within 5 mm of the AVDD pin (pin 9). Tie AVDD and DVDD to the same source if the digital supply is also 3-5 V; otherwise DVDD can run as low as 1.8 V for low-power MCUs. Avoid sharing the AVDD trace with high-current digital returns - use a star-ground or split-plane layout with a single-point tie at the ADC's AGND/DGND pins. At 5 V supply the part dissipates ~8.3 mW typ, which is negligible for thermal but can be a hidden source of ground bounce if the decoupling is poor.
Route the AIN1-AIN7 traces as short and symmetric as possible, and keep them away from the SCLK/DOUT/DIN digital traces. Place a guard ring tied to AGND around the analog input cluster if the board has switching power or RF sections. The REF pin (pin 10) should be decoupled with a 10 µF + 0.1 µF pair to AGND, and the AGND pin (pin 16) must connect to a low-impedance analog ground pour. For best 12-bit DNL/INL performance, the analog ground return should not share copper with the digital return currents - use a moat or stitched ground islands as appropriate to the stackup.
Drive the SPI signals (SCLK, /CS, DIN) from the host microcontroller with clean edges; series-terminate SCLK with 33 Ω if the trace exceeds 25 mm to dampen reflections. Read DOUT on the falling edge of SCLK to match the timing diagram in the datasheet. Hold /CS high when the ADC is idle to enter a low-power standby state. For multi-ADC SPI bus designs, dedicate one /CS line per ADC78H89 and avoid tying two DOUT pins together - use an external tri-state buffer or 74HC125 if bus sharing is required.
Do not exceed 5.25 V on AVDD or apply a digital supply higher than AVDD - this can latch-up the input ESD cells. Do not leave unused analog inputs floating; tie them to mid-supply (AVDD/2) or AGND through ~10 kΩ to prevent crosstalk into active channels. Do not operate the device with SCLK faster than the datasheet-specified maximum - the SAR conversion requires a minimum clock pulse width. Finally, remember that the ADC78H89CIMT is NRND; if your design has more than 24 months of production runway, qualify a drop-in or pin-compatible alternative (ADC78H89CIMTX/NOPB or ADC128S052CIMT) in parallel.
合规信息
RoHS compliance requires the /NOPB suffix; the base ADC78H89CIMT part number has matte-tin lead finish per National Semiconductor legacy datasheet. The part is NRND and not AEC-Q100 qualified - for automotive applications select an AEC-Q100-qualified alternative.
