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Texas Instruments ADC78H90CIMT
- Part No.:
- ADC78H90CIMT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADC78H90CIMT.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
ADC78H90CIMT from Texas Instruments is a low-power, 8-channel, 12-bit successive-approximation ADC with 500 kSPS throughput, internal track-and-hold, and SPI/QSPI/MICROWIRE-compatible serial interface. It operates from independent analog (2.7–5.25 V) and digital (2.7–AVDD) supplies and delivers ±1 LSB INL/DNL at industrial temperature range (−40°C to +85°C), targeting sensor data acquisition in portable instrumentation.
For engineers reviewing the ADC78H90CIMT datasheet, ADC78H90CIMT pinout, ADC78H90CIMT application, or ADC78H90CIMT equivalent, key selection considerations include its 16-pin TSSOP package, channel-selectable analog inputs (AIN1–AIN8), power-down mode (0.3 µW @ 3 V), straight-binary output format, and dual-supply noise isolation capability.
Technical Context
The ADC78H90CIMT implements a charge-redistribution DAC architecture with a 3-cycle track phase followed by a 13-cycle hold-and-convert phase per 16-SCLK frame. Its multiplexer selects one of eight analog inputs under control of a 3-bit address (ADD2–ADD0) loaded via DIN during each conversion cycle.
It features independent AGND and DGND pins, AVDD-referenced conversion, and digital I/O voltage tolerance up to AVDD - not DVDD - ensuring robust interfacing with mixed-voltage microcontrollers. Power management is controlled solely by CS: low enables full operation; high forces shutdown with <0.5 µW consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonicity and full code coverage across all channels. |
| Sampling Rate | 500 kSPS maximum - supports real-time acquisition of audio-band and control-loop signals. |
| INL / DNL | ±1 LSB max - ensures accurate amplitude fidelity for precision measurement applications. |
| Power (3 V) | 1.5 mW typical operational / 0.3 µW shutdown - enables battery-powered operation with extended runtime. |
| Analog Supply | 2.7 V to 5.25 V - allows direct use of common system rails without external reference or regulator. |
| Digital Interface | SPI/QSPI/MICROWIRE/DSP compatible - simplifies integration with TI C2000, ARM Cortex-M, and legacy DSPs. |
| Aperture Delay | 4 ns - minimizes sampling uncertainty for high-frequency signal capture. |
Pinout & Package
The ADC78H90CIMT is housed in a 16-lead TSSOP (PW package) with 0.65 mm pitch, optimized for compact PCB layouts and thermal performance (θJA = 96°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CS | Chip Select Input | Falling edge initiates conversion frame; high state forces full shutdown and tri-states DOUT. |
| 2 SCLK | Serial Clock Input | Controls timing of conversion, data shift-in (DIN), and data shift-out (DOUT); 50 kHz–8 MHz range. |
| 3 AGND | Analog Ground | Return path for AVDD and analog inputs; must be isolated from DGND to minimize noise coupling. |
| 4–11 AIN1–AIN8 | Analog Inputs | Single-ended channels referenced to AGND; input range = 0 V to AVDD; max leakage ±1 µA. |
| 12 DGND | Digital Ground | Return path for DVDD, SCLK, CS, DIN, DOUT; separation from AGND preserves SNR. |
| 13 DVDD | Digital Supply | +2.7 V to AVDD; powers logic and interface; bypassed with 0.1 µF ceramic near pin. |
| 14 DIN | Serial Data Input | Loads 8-bit control register (ADD2–ADD0) on first 8 rising SCLK edges after CS fall. |
| 15 DOUT | Serial Data Output | MSB-first 12-bit result clocked out on falling SCLK edges; tri-stated when CS is high. |
| 16 AVDD | Analog Supply | +2.7 V to +5.25 V; serves as conversion reference; requires 1 µF tantalum + 0.1 µF ceramic bypass. |
Key Features
| Feature | Design Value |
|---|---|
| Independent AVDD/DVDD supplies | Enables noise isolation between analog signal chain and digital interface, preserving 73 dB SINAD. |
| Hardware-controlled power-down | CS-driven shutdown reduces current to 200 nA, eliminating need for software sleep-state management. |
| Track-and-hold acquisition time | 3 SCLK cycles (e.g., 375 ns @ 8 MHz) ensures stable sampling of fast-changing sensor outputs. |
| Channel-to-channel crosstalk | −82 dB prevents interference between adjacent inputs in multi-sensor monitoring systems. |
| ESD-protected analog inputs | Withstands ±2500 V HBM; input clamping diodes limit voltage to GND −0.3 V / AVDD +0.3 V. |
Applications
| Medical Vital Sign Monitoring | Automotive Cabin Climate Control |
|---|---|
Use Scenario: Simultaneous acquisition of ECG, respiration, and temperature sensor outputs in handheld patient monitors. IC Role / Device Role / Timing Role: 12-bit ADC digitizing eight analog biosignals at 500 kSPS with low power and high channel isolation. Use Value: Enables single-chip replacement of multiple 8-bit converters, reducing BOM count and improving inter-channel accuracy (±2 LSB offset match). | Use Scenario: Reading thermistors, humidity sensors, and fan tachometers in automotive HVAC modules. IC Role / Device Role / Timing Role: Low-power, multi-channel ADC interfacing with 16-bit MCU over SPI while operating across −40°C to +85°C. Use Value: Eliminates external reference and level-shifting circuitry due to AVDD-referenced design and digital I/O tolerance up to AVDD. |
| Portable Test Equipment | Industrial PLC Analog Input Module |
Use Scenario: Battery-powered multimeter or data logger capturing voltage, current, and resistance readings. IC Role / Device Role / Timing Role: 12-bit SAR ADC with 0.3 µW shutdown mode and 1.5 mW active power at 3 V supply. Use Value: Extends battery life beyond 100 hours per charge while maintaining ±1 LSB linearity across temperature. | Use Scenario: Modular I/O card acquiring 8-channel 4–20 mA loop signals with cold-junction compensation. IC Role / Device Role / Timing Role: Precision ADC with independent AGND/DGND and 70.8 dB SNR supporting 16-bit effective resolution. Use Value: Reduces need for external op-amp buffering and anti-alias filtering due to 8 MHz full-power bandwidth and low input capacitance (3 pF in hold mode). |
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-only interface; no independent DVDD; 10-pin MSOP package. | Limited to lower throughput and single-supply operation; lacks power-down mode below 1 µW. | Choose when board space is critical and 200 kSPS suffices; avoid if dual-supply noise isolation or sub-µW shutdown is required. |
| ADS8320EB | Single-channel, 16-bit, 100 kSPS; SPI interface; 8-pin SOIC; external reference required. | Higher resolution but lower channel count and speed; no integrated MUX or track-and-hold. | Prefer for ultra-precision single-signal measurement; not suitable for multi-channel scanning or battery-constrained designs. |
Compared with ADS7822U and ADS8320EB, the ADC78H90CIMT uniquely combines 8-channel multiplexing, 500 kSPS rate, dual-supply independence, and sub-µW shutdown - making it optimal for compact, multi-sensor, battery-aware industrial and medical systems where integration and power efficiency are primary constraints.
Availability
ADC78H90CIMT is available at Aetrix Electronics and suitable for portable instrumentation, automotive cabin electronics, and medical vital sign monitors requiring stable component supply and long-term industrial-grade availability.
Supply support for ADC78H90CIMT 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, energy efficiency, and system-level integration.
The ADC78H90CIMT belongs to TI's precision data acquisition portfolio, designed specifically for cost-sensitive, space-constrained applications needing multi-channel 12-bit conversion without external references or complex support circuitry.
FAQ
What is the absolute maximum analog input voltage for the ADC78H90CIMT?
The absolute maximum analog input voltage for the ADC78H90CIMT is AVDD + 0.3 V, and the minimum is −0.3 V relative to AGND. Exceeding these limits risks forward-biasing internal ESD protection diodes, potentially causing measurement errors or latch-up. The recommended operating range remains 0 V to AVDD, as specified in the Electrical Characteristics table.
Does the ADC78H90CIMT require an external voltage reference?
No, the ADC78H90CIMT does not require an external voltage reference. It uses AVDD as its internal reference, with LSB size equal to AVDD / 4096. This eliminates external reference components and simplifies layout, though AVDD must be low-noise and well-bypassed (1 µF tantalum + 0.1 µF ceramic) to maintain 73 dB SINAD performance.
How many SCLK cycles are needed to complete one full conversion and data readout for the ADC78H90CIMT?
A full conversion and data readout for the ADC78H90CIMT requires exactly 16 SCLK cycles per frame: the first 3 cycles perform track-mode acquisition, and the remaining 13 cycles execute hold-mode conversion and shift out the 12-bit result MSB-first on DOUT. Each frame must contain an integer multiple of 16 SCLK cycles to ensure reliable operation.
Can the ADC78H90CIMT operate with DVDD higher than AVDD?
No, the ADC78H90CIMT cannot operate with DVDD higher than AVDD. The datasheet specifies DVDD must be between +2.7 V and AVDD, and exceeding AVDD by more than 0.3 V risks activating ESD diodes and damaging the device. Proper power sequencing requires AVDD to be applied before or simultaneously with DVDD to prevent overstress.
What is the function of the DONTC bits in the ADC78H90CIMT control register?
The DONTC bits (bits 7, 6, 2, 1, and 0) in the ADC78H90CIMT control register are "don't care" positions - their values have no effect on device operation. Only bits ADD2–ADD0 (bits 5–3) determine the selected analog input channel (AIN1–AIN8). This simplifies firmware implementation, as only three bits need to be set explicitly per conversion.
ADC78H90CIMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- -
ADC78H90CIMT FAQ
1.How can I place an order for ADC78H90CIMT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC78H90CIMT 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 ADC78H90CIMT reliable?
The price and inventory of ADC78H90CIMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC78H90CIMT is usually 5 days.
3.What payment methods are accepted for ADC78H90CIMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC78H90CIMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC78H90CIMT?
ADC78H90CIMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC78H90CIMT 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 ADC78H90CIMT?
For technical support, including ADC78H90CIMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC78H90CIMT requirements.
6.How does Aetrix verify that ADC78H90CIMT is sourced from the original manufacturer or authorized distributors?
All ADC78H90CIMT 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 ADC78H90CIMT meets industry standards.
7.What is the process for return or replacement of ADC78H90CIMT?
All ADC78H90CIMT units undergo pre-shipment inspection (PSI). If there is an issue with ADC78H90CIMT, 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 ADC78H90CIMT part is unused and in its original packaging.
Return procedure for ADC78H90CIMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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