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Texas Instruments TLC1225MJB
- Part No.:
- TLC1225MJB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
TLC1225MJB.pdf
- Description:
- SINGLE ADC SAR 12 BIT+SIGN PARAL
- Quantity:
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Product details
Overview
TLC1225MJB from Texas Instruments is a self-calibrating 12-bit-plus-sign analog-to-digital converter (ADC) designed for precision data acquisition in military-grade embedded systems. It delivers 12-bit linearity, ±5-V or single 5-V supply operation, true differential inputs with –Vref to Vref range, and 12-µs conversion at 2 MHz clock - enabling high-accuracy sensor interfacing in avionics and rugged instrumentation.
For engineers reviewing the TLC1225MJB datasheet, TLC1225MJB pinout, TLC1225MJB application, or TLC1225MJB equivalent, this page provides verified technical context, military-temperature-rated specifications (–55°C to 125°C), parallel 13-bit 2s-complement output timing, and calibrated capacitor-array architecture details critical for system-level accuracy validation and layout-aware interface design.
Technical Context
The TLC1225MJB implements successive-approximation conversion using a 13-bit capacitive DAC array with on-chip self-calibration of seven most significant capacitors and comparator offset - eliminating factory trimming and field zero-adjustment. Calibration requires 300 clock cycles; conversion requires 24 clock cycles.
It supports unipolar (0 V to 5 V, single 5-V supply) or bipolar (–5 V to 5 V, ±5-V supplies) operation with true differential sampling - no time skew between IN+ and IN– - and interfaces directly to 16-bit microprocessor buses via TTL/CMOS-compatible parallel I/O. READY OUT enables wait-state insertion for high-speed host synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit-plus-sign (13-bit 2s-complement output), delivering 4096 distinct codes across full-scale range |
| Linearity | 12-bit integral linearity error (±0.012% FSR), ensuring monotonicity and no missing codes |
| Conversion Time | 12 µs at fCLK = 2 MHz (24 clock cycles), enabling up to ~83 kSPS sustained throughput |
| Input Range | True differential: –VREF to +VREF; common-mode: –5 V to 5 V (±5-V supply) or 0 V to 5 V (single 5-V) |
| Operating Temp | –55°C to 125°C (military grade), validated for extended reliability in harsh-environment deployments |
| Power Dissipation | 87.5 mW max (ANLG + DGTL supplies), supporting low-thermal-impact integration in sealed enclosures |
| Supply Flexibility | Single 5-V (ANLG VCC+ = 5 V, ANLG VCC– = GND) or dual ±5-V (ANLG VCC+ = 5 V, ANLG VCC– = –5 V) |
Pinout & Package
Ceramic DIP (J package), 28-pin, through-hole mounting with 0.3-inch wide body. Pin 1 marked by notch or dot; pin numbering counterclockwise from top-left corner when viewed from top.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28 | See detailed mapping below | Full pin enumeration required for PCB layout and signal integrity planning |
| ANLG VCC– (Pin 1) | Analog negative supply rail | Reference for analog input common-mode; must be connected to –5 V (bipolar) or GND (unipolar) |
| IN– (Pin 2) | Inverting analog input | Differential partner to IN+; grounding enables unipolar mode (0–5 V) or bipolar mode (–5–5 V) |
| IN+ (Pin 3) | Non-inverting analog input | Primary analog signal source; sampled simultaneously with IN– for true differential rejection |
| ANLG GND (Pin 4) | Analog ground reference | Return path for analog signals and VREF; must be isolated from digital ground per layout guidelines |
| REF (Pin 5) | Reference voltage input | Defines full-scale differential input range (|IN+ – IN–| ≤ VREF); ratiometric to conversion result |
| ANLG VCC+ (Pin 6) | Analog positive supply rail | Must be 4.5–5.5 V; powers analog core including DAC array and comparator |
| TIE HIGH (Pin 7) | Digital input control | Must be externally tied to DGTL VCC; enables internal logic and bus interface functionality |
| CLK IN (Pin 8) | Master clock input | Drives all timing: calibration (300 cycles) and conversion (24 cycles); 0.3–2.6 MHz supported |
| WR (Pin 9) | Write strobe input | Initiates command latching (conversion/calibration) on rising edge; active-low write enable |
| CS (Pin 10) | Chip select input | Enables device for command or data access; falling edge initiates command decode sequence |
| RD (Pin 11) | Read strobe input | Triggers 13-bit parallel output onto I/O bus; falling edge resets INT flag |
| DGTL GND (Pin 12) | Digital ground reference | Return for digital I/O and control signals; separate from ANLG GND to minimize noise coupling |
| READY OUT (Pin 13) | Microprocessor wait-state output | Active-low open-drain signal indicating conversion readiness; inserts wait state during read/write |
| INT (Pin 14) | Interrupt output | Active-low, open-drain; asserts at conversion completion; cleared by CS+RD or CS+WR falling edge |
| DGTL VCC (Pin 15) | Digital supply rail | 4.5–5.5 V; powers digital interface, control logic, and output drivers |
| D12–D0/D10 (Pins 16–28) | Parallel data bus outputs | 13-bit bidirectional I/O: D12 = sign bit (2s-complement), D11–D0 = magnitude; D10–D15 shared with D4–D0 |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating capacitor array | Automatically corrects gain and offset errors in 7 MSB capacitors and comparator offset - eliminates manual trimming and field recalibration |
| True differential sampling | No time skew between IN+ and IN– sampling ensures accurate common-mode noise rejection (65 dB CMRR) without conversion artifacts |
| Extended temperature operation | Validated over –55°C to 125°C (TLC1225M grade), supporting deployment in aerospace, defense, and downhole systems |
| Parallel 13-bit 2s-complement interface | Direct connection to 16-bit microprocessor data buses with TTL/CMOS compatibility - no glue logic required |
| Ratiometric reference support | VREF defines full-scale range; conversion result scales linearly with VREF changes - ideal for transducer-based sensing |
Applications
| Aerospace Sensor Interface | Avionics Data Acquisition |
|---|---|
|
Use Scenario: High-precision measurement of pressure, temperature, and inertial sensor outputs in flight control units. IC Role / Device Role / Timing Role: ADC front-end converting differential bridge outputs with self-calibrated accuracy under thermal cycling. Use Value: Maintains 12-bit linearity across –55°C to 125°C without recalibration, reducing BOM cost and field maintenance intervals. |
Use Scenario: Analog signal digitization in cockpit display systems requiring deterministic latency and EMI resilience. IC Role / Device Role / Timing Role: Parallel-output ADC synchronized to host processor via READY OUT wait-state handshake. Use Value: 12-µs conversion time and interrupt-driven data ready signaling enable real-time sampling at >80 kSPS within tight timing budgets. |
| Military Instrumentation | Ruggedized Test Equipment |
|
Use Scenario: Portable field-deployable analyzers measuring voltage, current, and transducer signals in harsh environments. IC Role / Device Role / Timing Role: Self-calibrating ADC operating from ±5-V supplies with true differential inputs rejecting ground-loop noise. Use Value: Eliminates need for external zero-offset trim pots and reference buffers, simplifying PCB layout and improving long-term stability. |
Use Scenario: Benchtop multimeters and calibration standards requiring traceable accuracy and minimal drift. IC Role / Device Role / Timing Role: Precision ADC used with stable external VREF and guarded analog routing to achieve <±1 LSB zero error. Use Value: ±1 LSB zero error (TLC1225M grade) and 15 ppm/°C gain tempco ensure metrology-grade repeatability across ambient shifts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog-to-digital conversion applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7892BRZ-1 | 12-bit SAR ADC, 1 µs conversion, single 5-V supply only, no self-calibration, serial SPI interface | Requires external calibration and microcontroller firmware for offset/gain correction; lacks differential input flexibility | Select when ultra-fast sampling (>1 MSPS) and board space savings outweigh need for self-calibration and parallel bus interface |
| MAX195BCPP | 16-bit SAR ADC, 5 µs conversion, ±5-V supplies supported, internal reference, no self-calibration, parallel interface | Higher resolution but requires external calibration circuitry and has higher power (120 mW); no built-in capacitor array calibration | Select when 16-bit resolution is mandatory and system-level calibration infrastructure already exists |
Compared with AD7892BRZ-1 and MAX195BCPP, the TLC1225MJB uniquely combines military-temperature self-calibration, true differential sampling, and parallel 13-bit output - reducing system-level calibration overhead and enabling direct microprocessor integration without protocol translation.
Availability
TLC1225MJB is available at Aetrix Electronics and suitable for aerospace sensor interface, avionics data acquisition, and military instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLC1225MJB 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 high-reliability components for industrial, automotive, and defense markets.
The TLC1225MJB belongs to TI's legacy precision ADC product line, engineered specifically for high-accuracy, self-calibrating data acquisition in military and aerospace applications where long-term stability and minimal field maintenance are critical.
FAQ
What is the operating temperature range of the TLC1225MJB?
The TLC1225MJB is rated for operation from –55°C to 125°C, meeting military-grade environmental requirements. This specification is validated per the SLAS029B datasheet and applies specifically to the TLC1225M variant in J-package configuration. The TLC1225MJB designation confirms the ceramic DIP (J) packaging and full military temperature screening.
Does the TLC1225MJB require external calibration components?
No - the TLC1225MJB performs full self-calibration of its internal capacitor DAC array and comparator offset using on-chip logic. It eliminates the need for external trim pots, laser-trimmed resistors, or field zero-adjustment circuits. Calibration is initiated via software command (300 clock cycles) and maintains accuracy across temperature without manual intervention.
How does the TLC1225MJB handle differential analog inputs?
The TLC1225MJB samples IN+ and IN– simultaneously with zero time skew, enabling true differential operation and 65 dB common-mode rejection. Its input structure supports both unipolar (0 V to 5 V, single 5-V supply) and bipolar (–5 V to 5 V, ±5-V supplies) modes - with IN– grounded to select mode - and accepts differential ranges up to ±VREF.
What is the function of the TIE HIGH pin on the TLC1225MJB?
Pin 7 (TIE HIGH) on the TLC1225MJB must be externally connected to DGTL VCC (4.5–5.5 V). It enables internal digital control logic and bus interface circuitry. Leaving this pin floating or pulling it low disables proper operation of the WR, RD, and CS command decoding, preventing calibration and conversion initiation.
Can the TLC1225MJB operate with a single 5-V supply?
Yes - the TLC1225MJB supports single 5-V supply operation: ANLG VCC+ = 5 V, ANLG VCC– = ANLG GND, DGTL VCC = 5 V. In this configuration, the analog input common-mode range is 0 V to 5 V, and IN– is grounded to enable unipolar conversion. D12 remains low, and the output is 12-bit unsigned (not sign-extended).
TLC1225MJB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
TLC1225MJB FAQ
1.How can I place an order for TLC1225MJB through Aetrix?
Please submit a Request for Quotation (RFQ) for TLC1225MJB 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 TLC1225MJB reliable?
The price and inventory of TLC1225MJB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLC1225MJB is usually 5 days.
3.What payment methods are accepted for TLC1225MJB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLC1225MJB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLC1225MJB?
TLC1225MJB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLC1225MJB 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 TLC1225MJB?
For technical support, including TLC1225MJB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLC1225MJB requirements.
6.How does Aetrix verify that TLC1225MJB is sourced from the original manufacturer or authorized distributors?
All TLC1225MJB 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 TLC1225MJB meets industry standards.
7.What is the process for return or replacement of TLC1225MJB?
All TLC1225MJB units undergo pre-shipment inspection (PSI). If there is an issue with TLC1225MJB, 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 TLC1225MJB part is unused and in its original packaging.
Return procedure for TLC1225MJB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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