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Texas Instruments ADC78H90CIMTX/NOPB
- Part No.:
- ADC78H90CIMTX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADC78H90CIMTX/NOPB.pdf
- Description:
- IC ADC 12BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,543
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Product details
Overview
ADC78H90CIMTX/NOPB from Texas Instruments is a low-power, 8-channel, 12-bit successive-approximation ADC with 500 kSPS throughput, independent AVDD (2.7–5.25 V) and DVDD (2.7 V to AVDD) supplies, SPI/QSPI/MICROWIRE-compatible serial interface, and integrated track-and-hold - used in portable medical instrumentation for multi-sensor analog signal digitization.
For engineers reviewing the ADC78H90CIMTX/NOPB datasheet, ADC78H90CIMTX/NOPB pinout, ADC78H90CIMTX/NOPB application, or ADC78H90CIMTX/NOPB equivalent, key selection considerations include channel count, 12-bit monotonicity with ±1 LSB INL/DNL, 3–5 V dual-supply flexibility, 16-pin TSSOP package, and power-down mode consuming only 0.3 µW at 3 V.
Technical Context
The ADC78H90CIMTX/NOPB implements a charge-redistribution DAC architecture within a successive-approximation register (SAR) core, with internal track-and-hold sampling over 3 SCLK cycles followed by 13-cycle conversion. It uses straight-binary output coding and supports up to eight single-ended analog inputs (AIN1–AIN8) via an on-chip multiplexer.
Serial communication follows a 16-cycle frame: CS falling edge initiates acquisition, DIN accepts 8-bit control register data (ADD2:ADD0) during first 8 rising SCLK edges, and DOUT outputs 12-bit result MSB-first over next 12 falling edges - all synchronized to SCLK (50 kHz–8 MHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit with no missing codes - guarantees monotonic transfer function for precision control and measurement. |
| Sampling Rate | 500 kSPS maximum - enables real-time capture of signals up to ~200 kHz Nyquist bandwidth. |
| INL / DNL | ±1 LSB max - ensures accurate code-to-voltage mapping across full scale, critical for calibration-sensitive systems. |
| Power Consumption | 1.5 mW at 3 V / 8.3 mW at 5 V (active); 0.3 µW at 3 V (shutdown) - supports battery-powered portable designs. |
| Analog Input Range | 0 V to AVDD - eliminates need for external level-shifting when AVDD powers sensor front-end. |
| Supply Flexibility | AVDD = 2.7–5.25 V; DVDD = 2.7 V to AVDD - allows independent noise-isolated digital rail and clean analog reference rail. |
| SINAD / ENOB | 70 dB / 11.3 bits min at 40.2 kHz - delivers high-fidelity digitization for audio-band and biomedical waveforms. |
Pinout & Package
The ADC78H90CIMTX/NOPB is housed in a 16-lead TSSOP (PW package), 4.4 mm × 5.0 mm body, 0.65 mm pitch, with exposed pad not electrically connected.
| 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 | Controls timing of acquisition (first 3 cycles), conversion, and serial I/O; 50 kHz–8 MHz range. |
| 3 AGND | Analog ground return | Reference for analog inputs and AVDD; must be separated from DGND to minimize noise coupling. |
| 4–11 AIN1–AIN8 | Analog input channels | Single-ended inputs referenced to AGND; voltage range 0 V to AVDD; multiplexed under software control. |
| 12 DGND | Digital ground return | Return path for DVDD and digital I/O; requires separate PCB plane from AGND with single-point tie. |
| 13 DVDD | Digital supply input | +2.7 V to AVDD; powers logic, interface, and internal control circuitry; bypass with 0.1 µF ceramic. |
| 14 DIN | Serial data input | Loads 8-bit control register (ADD2:ADD0) on rising SCLK edges during first 8 cycles of each frame. |
| 15 DOUT | Serial data output | Outputs 12-bit conversion result MSB-first on falling SCLK edges; tri-stated when CS is high. |
| 16 AVDD | Analog supply input | +2.7 V to +5.25 V; serves as reference voltage and powers analog front-end; bypass with 1 µF tantalum + 0.1 µF ceramic. |
Key Features
| Feature | Design Value |
|---|---|
| Independent analog/digital supplies | Enables physical separation of noisy digital domains from sensitive analog signal paths on PCB. |
| Variable power management | CS-driven shutdown reduces current to 200 nA - extends battery life without external enable circuitry. |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to TI C2000, MSP430, and common microcontrollers without protocol translation logic. |
| On-chip track-and-hold | Eliminates need for external sample-hold amplifier; acquisition time fixed at 3 SCLK cycles. |
| Eight single-ended input channels | Reduces external multiplexer count and board space in multi-sensor systems like patient monitors. |
Applications
| Portable Medical Monitoring | Automotive Sensor Hub |
|---|---|
|
Use Scenario: Simultaneous acquisition of ECG, SpO₂, temperature, and respiration signals in handheld vital sign analyzers. IC Role / Device Role / Timing Role: Central 12-bit SAR ADC performing time-interleaved sampling across 8 analog front-ends with deterministic 16-cycle frame timing. Use Value: Enables compact, low-power design with <1.5 mW active consumption and no missing codes for clinical-grade waveform fidelity. |
Use Scenario: Aggregating cabin pressure, humidity, seat occupancy, and ambient light readings in automotive infotainment control modules. IC Role / Device Role / Timing Role: Multi-channel analog digitizer interfacing to MCU via SPI, supporting industrial-temp (−40°C to +85°C) operation. Use Value: Delivers ±1 LSB linearity across temperature and supply variation - critical for reliable sensor fusion algorithms. |
| Industrial Data Loggers | Wireless Sensor Nodes |
|
Use Scenario: Battery-operated environmental monitoring units logging temperature, voltage, and current across multiple zones. IC Role / Device Role / Timing Role: Low-quiescent ADC with programmable channel sequencing and hardware-triggered conversions via CS. Use Value: Achieves >1-year battery life using 0.3 µW shutdown current and flexible throughput scaling (down to intermittent sampling). |
Use Scenario: Zigbee/Bluetooth LE nodes measuring analog sensor outputs before wireless transmission. IC Role / Device Role / Timing Role: Serial-output ADC minimizing GPIO count and MCU firmware overhead through simple 3-wire SPI interface. Use Value: Reduces BOM cost and layout complexity versus parallel-output or external reference ADCs while maintaining 12-bit resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-channel, 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-channel, 12-bit, 200 kSPS, single-supply (2.7–3.6 V), SPI interface, no independent DVDD/AVDD separation. | Limited to lower throughput and narrower supply range; lacks dual-supply noise isolation capability. | Select when system uses only 3.3 V rails and throughput ≤200 kSPS suffices; avoid for mixed 3 V/5 V or high-SNR designs. |
| MAX11106ETE+ | 8-channel, 12-bit, 500 kSPS, internal reference, SPI interface, 16-pin TQFN (3×3 mm), no separate DGND/AGND pins. | Smaller footprint but less PCB-level analog/digital isolation; internal reference limits full-scale flexibility vs. AVDD-referenced ADC78H90CIMTX/NOPB. | Prefer for space-constrained designs where AVDD referencing is unnecessary and thermal performance of TQFN is acceptable. |
Compared with ADS7822U and MAX11106ETE+, the ADC78H90CIMTX/NOPB uniquely supports independent AVDD/DVDD rails with dedicated AGND/DGND pins, enabling superior PSRR and SNR in mixed-signal systems - especially where analog sensor front-ends operate at different voltages than the host MCU.
Availability
ADC78H90CIMTX/NOPB is available at Aetrix Electronics and suitable for portable medical instrumentation, automotive sensor hubs, and industrial data loggers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADC78H90CIMTX/NOPB 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, embedded processing, and connectivity technologies, with decades of expertise in precision data converters and industrial-grade ICs.
The ADC78H90CIMTX/NOPB belongs to TI's precision SAR ADC product line, engineered for low-power, multi-channel data acquisition in portable, medical, and automotive applications where accuracy, supply flexibility, and small footprint are essential.
FAQ
What is the absolute maximum clock frequency supported by the ADC78H90CIMTX/NOPB?
The ADC78H90CIMTX/NOPB supports a maximum SCLK frequency of 8 MHz, with guaranteed operation across the full industrial temperature range (−40°C to +85°C). At this rate, the device achieves its rated 500 kSPS throughput, completing each 12-bit conversion in exactly 16 SCLK cycles - 3 for track and 13 for hold/conversion.
Does the ADC78H90CIMTX/NOPB require an external voltage reference?
No, the ADC78H90CIMTX/NOPB uses AVDD as its internal reference voltage - the full-scale range is 0 V to AVDD. This eliminates the need for an external reference, simplifying BOM and layout. However, AVDD must be clean and well-bypassed (1 µF tantalum + 0.1 µF ceramic) to maintain specified SINAD and THD performance.
How does power-down mode work on the ADC78H90CIMTX/NOPB?
Power-down mode is activated automatically when CS is held high, reducing total supply current to 200 nA (typical) and power consumption to 0.3 µW at 3 V. The device exits shutdown on the next CS falling edge and begins acquisition immediately - no wake-up delay or dummy conversions are required, enabling rapid response in event-driven sensing.
Can the ADC78H90CIMTX/NOPB interface directly with a 5 V microcontroller SPI bus?
No - the ADC78H90CIMTX/NOPB digital I/O pins (CS, SCLK, DIN, DOUT) are limited to AVDD voltage levels and must not exceed AVDD + 0.3 V. If interfacing with a 5 V MCU, AVDD must be set to ≥4.7 V, and level-shifting or open-drain pull-ups referenced to AVDD are required for reliable 5 V–AVDD logic translation.
What is the purpose of the DONTC bits in the ADC78H90CIMTX/NOPB control register?
The DONTC bits (bits 7, 6, 2, 1, 0) in the 8-bit control register have no functional effect on ADC78H90CIMTX/NOPB operation - they are "don't care" placeholders. Only bits ADD2–ADD0 (bits 5–3) determine channel selection (AIN1–AIN8); all other bits may be set to 0 or 1 without altering conversion behavior or timing.
ADC78H90CIMTX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for ADC78H90CIMTX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADC78H90CIMTX/NOPB 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/NOPB reliable?
The price and inventory of ADC78H90CIMTX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADC78H90CIMTX/NOPB is usually 5 days.
3.What payment methods are accepted for ADC78H90CIMTX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADC78H90CIMTX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADC78H90CIMTX/NOPB?
ADC78H90CIMTX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADC78H90CIMTX/NOPB 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/NOPB?
For technical support, including ADC78H90CIMTX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADC78H90CIMTX/NOPB requirements.
6.How does Aetrix verify that ADC78H90CIMTX/NOPB is sourced from the original manufacturer or authorized distributors?
All ADC78H90CIMTX/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of ADC78H90CIMTX/NOPB?
All ADC78H90CIMTX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with ADC78H90CIMTX/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for ADC78H90CIMTX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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