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Texas Instruments TLV1548MJB
- Part No.:
- TLV1548MJB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
TLV1548MJB.pdf
- Description:
- TLV1548M LOW-VOLTAGE 10-BIT ADC
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
TLV1548MJB from Texas Instruments is a military-grade 10-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated 8-channel analog multiplexer, SPI/QSPI-compatible serial interface, and asynchronous sampling control via CSTART. It operates from 2.7 V to 5.5 V, achieves ≤10 µs conversion time, supports programmable power-down (1 µA), and delivers ratiometric conversion using differential reference inputs (REF+/REF–). It is deployed in ruggedized data acquisition systems requiring high reliability across –55°C to 125°C.
For engineers reviewing the TLV1548MJB datasheet, TLV1548MJB pinout, TLV1548MJB application, or TLV1548MJB equivalent, key selection considerations include its military temperature rating, 8-channel MUX capability, asynchronous CSTART-controlled sampling for high-impedance sources, EOC flag signaling, and dual-mode (microprocessor/DSP) serial interface compatibility with INV CLK polarity adjustment.
Technical Context
The TLV1548MJB implements a switched-capacitor SAR architecture with automatic sample-and-hold-except during extended sampling, where CSTART directly controls acquisition duration. Its 11-channel internal multiplexer selects among eight external analog inputs (A0–A7) or three self-test voltages, using break-before-make switching to minimize inter-channel crosstalk.
Serial communication supports two distinct modes: microprocessor mode (FS tied high, CS-triggered, I/O CLK edge-defined data capture) and TMS320 DSP mode (FS-driven frame sync, 16-clock cycle with zero-padded output). The INV CLK input configures clock edge polarity for both modes, and the EOC output provides synchronous end-of-conversion indication aligned to the tenth I/O CLK edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 10-bit SAR - delivers 1024 discrete digital codes over full-scale range |
| Conversion Time | ≤10 µs (fast mode) - enables ≥100 kSPS throughput in continuous operation |
| Analog Inputs | 8-channel (A0–A7) - reduces external MUX count and PCB area in multi-sensor systems |
| Supply Voltage | 2.7 V to 5.5 V - supports direct interfacing with 3.3 V and 5 V logic domains |
| Power-Down Current | 1 µA typical - extends battery life in intermittent-sampling applications |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, defense, and downhole industrial environments |
| Reference Inputs | Differential REF+/REF– - enables ratiometric measurement and noise rejection |
Pinout & Package
TLV1548MJB is packaged in a 20-pin ceramic J-leaded package (J PACKAGE), rated for military temperature operation and hermetically sealed for long-term reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A7 | Analog input channels | Selectable 8-channel analog front-end; high-impedance inputs require CSTART for extended sampling when source impedance >1 kΩ |
| CSTART | Asynchronous sampling trigger | Falling edge initiates sampling; low duration sets acquisition time; rising edge starts conversion - decouples timing from I/O CLK |
| CS | Chip select | Active-low enable for serial interface; resets internal logic and activates DATA IN/OUT/I/O CLK on falling edge |
| DATA IN | Serial command input | 4-bit MSB-first register controlling channel selection (0h–7h), power-down (8h), conversion rate (9h/Ah), or self-test (Bh–Dh) |
| DATA OUT | Serial result output | 3-state 10-bit MSB-first output; driven only when CS is low (or FS active in DSP mode); changes on I/O CLK edges per mode |
| EOC | End-of-conversion flag | Active-low open-drain signal indicating conversion completion; synchronized to 10th I/O CLK edge |
| I/O CLK | Serial interface clock | Bidirectional clock up to 10 MHz (at VCC ≥4.5 V); edge polarity configurable via INV CLK |
| INV CLK | Input clock polarity control | Tied to GND or VCC to invert I/O CLK sampling edges for microprocessor/DSP mode compatibility |
| FS | DSP frame sync | Indicates start of serial frame in TMS320 DSP interface; must fall within 7 I/O CLK cycles after CS↓ |
| REF+/REF– | Differential reference inputs | Define full-scale (0 V to VCC) and zero-scale points; support ratiometric sensing and isolation from supply noise |
| VCC/GND | Power supply | Single 2.7–5.5 V supply; GND serves as analog/digital reference return |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel analog multiplexer | Reduces external component count and board space in sensor aggregation systems |
| Asynchronous CSTART sampling | Enables accurate digitization of high-impedance sources (>1 kΩ) without external S/H circuitry |
| Dual serial interface modes | Hardware-selectable microprocessor (SPI/QSPI) or TMS320 DSP protocol support - no firmware rework needed |
| Programmable conversion rate | Fast (≤10 µs) or slow (≤40 µs) mode selectable via software command - optimizes speed vs. power trade-off |
| Built-in self-test | Three internal test voltages (VREF/2, VREF, VREF) provide production and field calibration verification |
Applications
| Avionics Sensor Monitoring | Downhole Oil & Gas Instrumentation |
|---|---|
Use Scenario: Real-time monitoring of pressure, temperature, and vibration sensors in flight control units under extreme thermal cycling. IC Role / Device Role / Timing Role: 10-bit SAR ADC with 8-channel MUX acquires analog sensor outputs and transmits digitized data via SPI to flight management computer. Use Value: Military-grade –55°C to 125°C operation ensures functional integrity during rapid altitude-induced thermal transients. | Use Scenario: High-temperature logging while drilling (LWD) tools measuring formation resistivity and gamma radiation at 175°C ambient. IC Role / Device Role / Timing Role: Ruggedized ADC interfaces with high-Z piezoresistive sensors and delivers stable 10-bit samples despite supply ripple and EMI. Use Value: Differential REF+/REF– inputs reject common-mode noise from motor drives and downhole telemetry lines. |
| Spacecraft Power System Telemetry | Ruggedized Industrial PLC Analog Input Module |
Use Scenario: Monitoring solar array voltage, battery charge current, and bus regulation in LEO satellite power management units. IC Role / Device Role / Timing Role: TLV1548MJB digitizes multiple DC rails and thermal sensors, with EOC flag enabling deterministic interrupt-driven sampling in real-time OS. Use Value: 1 µA power-down mode extends mission lifetime during eclipse periods without sacrificing wake-up latency. | Use Scenario: Modular I/O card in explosion-proof control cabinets acquiring signals from strain gauges, RTDs, and 4–20 mA transmitters. IC Role / Device Role / Timing Role: Configurable 8-channel ADC with asynchronous CSTART handles mixed-sensitivity analog inputs without external amplification. Use Value: Break-before-make MUX prevents transient coupling between high-voltage and low-level sensor channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 10-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, 2.7–5.25 V supply, no CSTART, single 4-channel MUX | Limited to lower-precision industrial monitoring; lacks military temp rating and asynchronous sampling | Choose when cost sensitivity outweighs resolution, temperature, and sampling flexibility requirements |
| AD7898ARZ-10 | 12-bit resolution, 5 V supply only, SPI-only interface, no built-in MUX or CSTART | Higher precision but requires external multiplexer and external sample control; not rated beyond –40°C to +85°C | Prefer when absolute accuracy >10-bit is mandatory and system design accommodates external timing/MUX components |
Compared with ADS7822U and AD7898ARZ-10, the TLV1548MJB uniquely combines military temperature qualification, integrated 8-channel MUX, and hardware-controlled asynchronous sampling - making it the only option for compact, high-reliability, multi-sensor data acquisition in extreme environments without external support circuitry.
Availability
TLV1548MJB is available at Aetrix Electronics and suitable for avionics sensor monitoring, downhole oil & gas instrumentation, spacecraft power telemetry, and ruggedized industrial PLC analog input modules requiring stable component supply across extended temperature and lifecycle demands.
Supply support for TLV1548MJB 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 ICs for industrial, automotive, aerospace, and communications markets.
The TLV1548MJB belongs to TI's legacy precision data acquisition portfolio, designed specifically for high-integrity, low-power, multi-channel analog digitization in mission-critical systems operating across extended military temperature ranges.
FAQ
What is the maximum I/O CLK frequency supported by the TLV1548MJB?
The TLV1548MJB supports up to 10 MHz I/O CLK at VCC ≥4.5 V with source impedance ≤100 Ω. At 2.7 V supply, maximum I/O CLK drops to 2.39 MHz for 1 kΩ source impedance. Performance depends on both supply voltage and analog source impedance - consult Table 1 in SLAS139C for exact derating. The TLV1548MJB maintains reliable operation across its full –55°C to 125°C range at these rates.
How does the CSTART pin function in the TLV1548MJB, and why is it critical for high-impedance sources?
CSTART enables asynchronous sampling: its falling edge initiates acquisition, and its low duration directly sets the sampling time (tACQ). This bypasses fixed I/O CLK–based timing, allowing sufficient charge settling for analog sources >1 kΩ. Without CSTART, sampling time is fixed at six I/O CLK cycles - insufficient for high-Z sensors. The TLV1548MJB's CSTART functionality eliminates need for external sample-and-hold circuits in ruggedized designs.
Does the TLV1548MJB support both SPI and DSP serial protocols, and how is the mode selected?
Yes - the TLV1548MJB supports both microprocessor (SPI/QSPI-compatible) and TMS320 DSP serial interfaces. Mode is selected automatically: at the falling edge of CS, the device samples FS. If FS is high, microprocessor mode activates; if FS is low, DSP mode activates. No configuration register write is needed. The TLV1548MJB uses the same physical pins (CS, I/O CLK, DATA IN/OUT, FS) for both modes, simplifying board design across host processor families.
What self-test capabilities does the TLV1548MJB provide, and how are they accessed?
The TLV1548MJB includes three internal self-test voltages: (REF+ − REF−)/2, REF+, and REF−. These are selected by writing input data bytes Bh (0xB), Ch (0xC), and Dh (0xD) to DATA IN. Each returns predictable digital outputs (200h, 000h, 3FFh respectively), enabling factory calibration and field diagnostics without external test equipment. The TLV1548MJB performs these tests using the same signal path as normal conversions - validating MUX, reference, and ADC core integrity.
Is the TLV1548MJB pin-compatible with other variants in the TLV154x family, such as TLV1548CDB or TLV1548IDB?
No - the TLV1548MJB uses a ceramic J-package (20-pin), whereas TLV1548CDB and TLV1548IDB use plastic DB packages (also 20-pin) with different thermal, mechanical, and reliability specifications. While pin functions and electrical behavior are identical across the family, the J-package has distinct lead finish, hermetic sealing, and MIL-PRF-38535 compliance. PCB layout must account for J-package dimensions and solder profile - the TLV1548MJB is not a drop-in replacement for DB/D/PW variants.
TLV1548MJB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 10
- Sampling Rate (Per Second):
- 85k
- Number of Inputs:
- 8
- Input Type:
- Single Ended
- Data Interface:
- DSP, QSPI, SPI
- Configuration:
- MUX-S/H-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- -
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 20-CDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
TLV1548MJB FAQ
1.How can I place an order for TLV1548MJB through Aetrix?
Please submit a Request for Quotation (RFQ) for TLV1548MJB 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 TLV1548MJB reliable?
The price and inventory of TLV1548MJB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLV1548MJB is usually 5 days.
3.What payment methods are accepted for TLV1548MJB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLV1548MJB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLV1548MJB?
TLV1548MJB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLV1548MJB 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 TLV1548MJB?
For technical support, including TLV1548MJB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLV1548MJB requirements.
6.How does Aetrix verify that TLV1548MJB is sourced from the original manufacturer or authorized distributors?
All TLV1548MJB 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 TLV1548MJB meets industry standards.
7.What is the process for return or replacement of TLV1548MJB?
All TLV1548MJB units undergo pre-shipment inspection (PSI). If there is an issue with TLV1548MJB, 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 TLV1548MJB part is unused and in its original packaging.
Return procedure for TLV1548MJB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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