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Texas Instruments ADC78H90CIMTX
- Part No.:
- ADC78H90CIMTX
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADC78H90CIMTX.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,503
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Product details
Overview
ADC78H90CIMTX from Texas Instruments is a low-power, 12-bit successive-approximation ADC with eight analog input channels (AIN1–AIN8), 500 kSPS throughput, ±1 LSB INL/DNL, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from independent 2.7V–5.25V analog (AVDD) and 2.7V–AVDD digital (DVDD) supplies, and is used in portable instrumentation for multi-channel sensor digitization.
For engineers reviewing the ADC78H90CIMTX datasheet, ADC78H90CIMTX pinout, ADC78H90CIMTX application, or ADC78H90CIMTX equivalent, key selection considerations include channel count, 16-pin TSSOP package compatibility, track-and-hold acquisition time (3 SCLK cycles), shutdown current (0.3 µA at 3V), and straight-binary output format aligned to AVDD reference.
Technical Context
The ADC78H90CIMTX implements a charge-redistribution DAC-based SAR architecture with integrated track-and-hold. Its multiplexer selects one of eight inputs per conversion cycle, and internal control logic sequences acquisition (first 3 SCLK edges) followed by 13-cycle conversion and serial readout.
It supports full-speed operation at 8 MHz SCLK with guaranteed timing across −40°C to +85°C. Digital I/Os are referenced to DVDD but limited to AVDD voltage range, while analog inputs accept 0V to AVDD - requiring clean AVDD bypassing (1 µF tantalum + 0.1 µF ceramic) to maintain 73 dB SINAD and 11.8-bit ENOB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - ensures monotonicity and full-scale code coverage for precision measurement. |
| Sample Rate | 500 kSPS maximum - enables real-time sampling of signals up to ~200 kHz Nyquist bandwidth. |
| INL / DNL | ±1 LSB max - guarantees accurate end-point linearity and step-size consistency across full scale. |
| Power (3V) | 1.5 mW typical in active mode; 0.3 µW in shutdown - supports battery-powered portable systems. |
| Supply Range | AVDD: 2.7V–5.25V; DVDD: 2.7V–AVDD - allows flexible dual-supply or single-supply configurations. |
| Serial Interface | SPI/QSPI/MICROWIRE/DSP compatible - interoperates with common microcontrollers without protocol translation. |
| Aperture Delay | 4 ns - minimizes sampling uncertainty for high-frequency signal capture. |
Pinout & Package
The ADC78H90CIMTX is housed in a 16-lead TSSOP (PW package) with exposed pad, optimized for thermal performance (θJA = 96°C/W) on 4-layer PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select Input | Falling edge initiates conversion frame; high state forces shutdown and tri-states DOUT. |
| 2 SCLK | Serial Clock Input | 50 kHz–8 MHz clock controls conversion timing and serial data transfer synchronization. |
| 3 AVDD | Analog Power Supply | +2.7V to +5.25V reference for analog section and ADC full-scale; requires local 1 µF + 0.1 µF bypass. |
| 4 DOUT | Digital Output | MSB-first straight-binary result; active only when CS is low; tri-stated otherwise. |
| 5 AGND | Analog Ground | Return path for AVDD and analog inputs; must be separated from DGND to minimize noise coupling. |
| 6 DIN | Digital Input | Loads 8-bit control register (ADD2–ADD0) on first 8 rising SCLK edges after CS fall. |
| 7–14 AIN1–AIN8 | Analog Inputs | Single-ended channels accepting 0V to AVDD; selected via ADD2:ADD0 bits in control register. |
| 15 DVDD | Digital Power Supply | +2.7V to AVDD supply for logic; must not exceed AVDD by >300 mV to prevent ESD diode conduction. |
| 16 DGND | Digital Ground | Return path for DVDD and digital I/Os; routed separately from AGND with single-point connection. |
Key Features
| Feature | Design Value |
|---|---|
| Independent AVDD/DVDD supplies | Enables noise isolation between analog and digital domains, preserving 73 dB SINAD in mixed-signal systems. |
| Variable power management | CS-driven shutdown reduces current to 0.3 µA (3V), enabling ultra-low-power sleep modes in portable devices. |
| On-chip track-and-hold | Acquires input in first 3 SCLK cycles - eliminates need for external sample-hold circuitry and simplifies layout. |
| Eight-channel multiplexer | Reduces system component count vs. discrete ADCs; supports sequential scanning of sensors without external mux control. |
| Straight-binary output format | Direct compatibility with unsigned integer processing in microcontrollers and DSPs, avoiding two's-complement conversion overhead. |
Applications
| Portable Medical Sensors | Automotive Cabin Monitoring |
|---|---|
Use Scenario: Simultaneous acquisition of ECG, temperature, and SpO₂ analog signals in handheld patient monitors. IC Role / Device Role / Timing Role: 12-bit SAR ADC performing 500 kSPS multi-channel sampling with <4 ns aperture delay for waveform fidelity. Use Value: Single-chip solution replaces multiple lower-resolution converters, reducing BOM cost and board area while maintaining clinical-grade linearity (±1 LSB INL). |
Use Scenario: Digitizing cabin pressure, humidity, and seat occupancy sensor outputs in automotive infotainment ECUs. IC Role / Device Role / Timing Role: Industrial-temp (−40°C to +85°C) ADC interfacing to microcontroller via SPI with minimal GPIO usage. Use Value: Independent AVDD/DVDD rails suppress digital switching noise from MCU, ensuring stable 11.8-bit ENOB across operating conditions. |
| Industrial Data Loggers | Wireless Sensor Nodes |
Use Scenario: Battery-powered environmental logger capturing temperature, light, and vibration from MEMS accelerometers. IC Role / Device Role / Timing Role: Low-power 12-bit converter with 0.3 µW shutdown current, triggered by wake-up interrupt from host MCU. Use Value: Enables >1-year battery life using CR2032 cells by minimizing active time and leveraging CS-controlled power gating. |
Use Scenario: Compact IoT node measuring soil moisture, pH, and ambient light before transmitting via BLE or LoRa. IC Role / Device Role / Timing Role: SPI-compatible ADC with 16-pin TSSOP footprint matching space-constrained RF module layouts. Use Value: Straight-binary output and 3–5 V supply flexibility simplify integration with common 3.3 V or 5 V wireless SoCs without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, 200 kSPS; SPI interface; 3.3V-only supply (AVDD = DVDD = 2.7–3.6V); no independent supply support. | Limited to lower throughput and single-supply designs; lacks AVDD/DVDD separation for noise-sensitive analog front-ends. | Select when system uses only 3.3V rails and 200 kSPS suffices; avoid where AVDD noise immunity or 500 kSPS is required. |
| MAX11100ETE+ | 8-channel, 12-bit, 500 kSPS; SPI-compatible; internal reference; 2.7–3.6V supply only; TQFN-16 package. | Includes internal 2.048V reference but no external AVDD-as-reference option; smaller TQFN footprint limits thermal dissipation. | Choose for reference-stable measurements in space-constrained designs; prefer ADC78H90CIMTX when AVDD-referenced flexibility or industrial temp range is critical. |
Compared with ADS7822U and MAX11100ETE+, the ADC78H90CIMTX uniquely combines 500 kSPS throughput, true dual-supply operation, AVDD-as-reference capability, and industrial temperature rating - making it optimal for portable instrumentation requiring both speed and analog integrity.
Availability
ADC78H90CIMTX is available at Aetrix Electronics and suitable for portable medical sensors, automotive cabin monitoring, and industrial data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADC78H90CIMTX includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and low-power signal chain solutions.
The ADC78H90CIMTX belongs to TI's precision SAR ADC product line, designed specifically for portable and battery-operated instrumentation where multi-channel capability, low power, and robust AC performance are essential.
FAQ
What is the maximum clock frequency supported by the ADC78H90CIMTX?
The ADC78H90CIMTX supports a maximum SCLK frequency of 8 MHz, with guaranteed timing performance across the full industrial temperature range (−40°C to +85°C). At this rate, the device achieves its rated 500 kSPS throughput, completing each conversion in exactly 16 SCLK cycles (3 for track, 13 for hold/convert/readout). Operation below 50 kHz is not recommended per datasheet specifications.
Does the ADC78H90CIMTX require an external voltage reference?
No, the ADC78H90CIMTX uses AVDD as its internal reference voltage - the LSB step size equals AVDD / 4096. This eliminates the need for an external reference, simplifying design and reducing BOM count. However, AVDD must be low-noise and well-bypassed (1 µF tantalum + 0.1 µF ceramic within 1 cm) to maintain specified 73 dB SINAD and ±1 LSB INL performance.
How does the ADC78H90CIMTX handle power-down mode?
The ADC78H90CIMTX enters automatic power-down mode when CS is held high, reducing supply current to 0.3 µA (at 3V) or 0.5 µA (at 5V). It also powers down between conversions during continuous framing (i.e., between the 16th and next 1st SCLK falling edge). No initialization or dummy conversions are needed upon wake-up - the first conversion after CS fall delivers full-resolution data immediately.
Can the ADC78H90CIMTX operate with AVDD and DVDD at different voltages?
Yes - AVDD may range from 2.7V to 5.25V, while DVDD must be between 2.7V and AVDD. Critically, DVDD must not exceed AVDD by more than 300 mV to prevent forward-biasing internal ESD protection diodes. This dual-supply flexibility allows noise isolation in mixed-signal systems, such as separating noisy digital MCU supplies from clean analog sensor supplies.
What is the function of the DIN pin on the ADC78H90CIMTX?
The DIN pin loads the 8-bit control register of the ADC78H90CIMTX on the first 8 rising edges of SCLK after CS falls. Bits ADD2–ADD0 (positions 5–3) select the next analog input channel (AIN1–AIN8); remaining bits are don't-care. This enables dynamic channel sequencing without host processor intervention beyond serial data transmission - a key enabler for autonomous multi-channel sampling.
ADC78H90CIMTX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- SPI, DSP
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Supply
- Voltage - Supply, Analog:
- 2.7V ~ 5.25V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADC78H90CIMTX FAQ
1.How can I place an order for ADC78H90CIMTX through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC78H90CIMTX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADC78H90CIMTX reliable?
The price and inventory of ADC78H90CIMTX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC78H90CIMTX is usually 5 days.
3.What payment methods are accepted for ADC78H90CIMTX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC78H90CIMTX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC78H90CIMTX?
ADC78H90CIMTX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC78H90CIMTX order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADC78H90CIMTX?
For technical support, including ADC78H90CIMTX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC78H90CIMTX requirements.
6.How does Aetrix verify that ADC78H90CIMTX is sourced from the original manufacturer or authorized distributors?
All ADC78H90CIMTX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADC78H90CIMTX meets industry standards.
7.What is the process for return or replacement of ADC78H90CIMTX?
All ADC78H90CIMTX units undergo pre-shipment inspection (PSI). If there is an issue with ADC78H90CIMTX, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADC78H90CIMTX part is unused and in its original packaging.
Return procedure for ADC78H90CIMTX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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