TLC542IFNRG3 - 8-Bit 25kSPS 11-Ch SAR ADC | Texas Instruments
Référence : TLC542IFNRG3 ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.34 | $2,34 |
| 10 | $2.11 | $21,10 |
| 100 | $1.87 | $187,00 |
| 500 | $1.65 | $825,00 |
| 1 000 | $1.45 | $1 450,00 |
TLC542IFNRG3 Présentation
Key headline specifications include 8-bit resolution, a 25 kSPS sampling rate, a 20-microsecond conversion time, 11 analog input channels, and a switched-capacitor successive-approximation architecture. The serial output uses a 3-state interface that connects directly to a microprocessor or DSP through three inputs: I/O CLOCK, CS (chip select) and ADDRESS (with serial data output on the I/O CLOCK line).
An SAR ADC is a type of data converter that uses a binary-search algorithm against an internal DAC to resolve each input voltage into a digital code in N clock cycles (where N is the resolution in bits). SAR ADCs typically outperform integrating or delta-sigma converters on speed and latency, at the cost of resolution, and are widely used in embedded data acquisition, motor control, sensor read-out, and instrumentation front-ends. Within the converter hierarchy, SAR sits between fast flash ADCs (low resolution, very high speed) and delta-sigma ADCs (high resolution, lower speed), making 8-bit 25 kSPS parts a sweet spot for cost-sensitive multi-channel monitoring.
The TLC542IFNRG3 is built on a CMOS switched-capacitor process that integrates the sample-and-hold into the SAR core, eliminating external track/hold circuitry. Built-in features include software-configurable analog input multiplexer addressing, a sample-and-hold, internal reference, and a serial I/O port that simplifies PCB layout by replacing wide parallel data buses with a single serial link.
Typical applications include multiple sensor monitoring, process control front-ends, battery-cell voltage monitoring, isolated data acquisition modules, portable instrumentation, and consumer electronics such as appliance control boards where a small MCU needs to read several analog points without consuming many GPIO pins.
When designing with this part, note that the input multiplexer allows one of 11 channels to be addressed through a single serial write, and the previous conversion result is read on the same clock edge - this time-multiplexed protocol keeps host pin count low. Decouple VCC close to the package with at least 0.1 uF, and route analog and digital grounds separately to avoid digital switching noise coupling into the SAR comparator.
Alternatives de remplacement direct pour TLC542IFNRG3 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
TLC542IFN
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TLC542IN
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TLC1542IFNG3
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC540IFNRG3
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
TLC542IFNRG3 Valeurs maximales et caractéristiques électriques
| Résolution | 8 bits |
| Number of Analog Input Channels | 11 |
| Fréquence d'échantillonnage | 25 kSPS (max) |
| Conversion Time | 20 us (typical) |
| Architecture | Successive Approximation (SAR) with switched-capacitor input |
| Data Interface | Serial (3-state, I/O CLOCK + CS + ADDRESS) |
| Input Type | Single-ended, multiplexed |
| Linearity Error | 0.1953 % (max) |
| Sample Rate (Per Second) | 0.04 MHz (per partstack listing) |
| Plage de température de fonctionnement | -40C to +85C (Industrial) |
| Boîtier / Format | 20-LCC (J-Lead), PLCC-20 (9x9 mm) |
| Type de montage | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Marking Code | TLC542I |
| Number of Terminals | 20 |
| Terminal Form | J BEND |
| Package Code (JEDEC) | QCCJ |
Configuration des broches de TLC542IFNRG3
| Broche 1 | AIN0 — Analog input channel 0 |
| Broche 2 | AIN1 — Analog input channel 1 |
| Broche 3 | AIN2 — Analog input channel 2 |
| Broche 4 | AIN3 — Analog input channel 3 |
| Broche 5 | AIN4 — Analog input channel 4 |
| Broche 6 | AIN5 — Analog input channel 5 |
| Broche 7 | AIN6 — Analog input channel 6 |
| Broche 8 | AIN7 — Analog input channel 7 |
| Broche 9 | REF+ — Upper reference voltage input |
| Broche 10 | GND — Ground (analog/digital common) |
| Broche 11 | AIN8 — Analog input channel 8 |
| Broche 12 | REF- — Lower reference voltage input (typically GND) |
| Broche 13 | AIN9 — Analog input channel 9 |
| Broche 14 | AIN10 — Analog input channel 10 |
| Broche 15 | VCC — Positive supply voltage (typical 5 V) |
| Broche 16 | SERIAL DATA — Serial 3-state data output |
| Broche 17 | I/O CLOCK — Serial clock input/output |
| Broche 18 | ADDRESS — Multiplexer address input |
| Broche 19 | NC — Not connected (per datasheet) |
| Broche 20 | NC — Not connected (per datasheet) |
Applications typiques
TLC542IFNRG3 convient pour 6 applications: Multi-Channel Sensor Monitoring, Process Control Front-End, Battery Cell Voltage Monitoring, Portable Instrumentation, Consumer Appliance Control, Isolated Data Acquisition Module.
Multi-Channel Sensor Monitoring
The TLC542IFNRG3's on-chip 11-channel analog multiplexer makes it a natural fit for sensor monitoring boards that must read many slowly-changing signals in sequence. With 8-bit resolution, 25 kSPS sampling, and 20 us conversion time, it can digitize each channel once per scan loop while the host MCU runs other tasks. Typical use cases include thermistor arrays in HVAC systems, potentiometer position read-out in industrial equipment, and battery-pack cell voltage monitoring in cordless tools where multiple analog signals feed a single low-pin-count MCU.
Recommandé
Process Control Front-End
In factory process-control boards, the TLC542IFNRG3 digitizes 11 analog process variables (pressure, flow, temperature, position) while running from an industrial-grade temperature range of -40C to +85C. The serial 3-state interface keeps PCB routing clean by replacing a 12+ pin parallel data bus with a single I/O CLOCK and CS pair. The 0.1953% max linearity error is more than adequate for trend logging and limit alarming in SCADA and PLC applications where the converter's cost per channel is more important than 12-bit precision.
Recommandé
Battery Cell Voltage Monitoring
Battery management boards for 8-12 cell packs benefit from the TLC542IFNRG3's ability to address 11 analog input channels through a single serial stream, allowing a low-cost MCU to monitor each cell's voltage without using a dedicated ADC per cell. The SAR architecture settles in 20 us per conversion, which is fast enough to scan all 11 cells in well under 1 ms and avoid drift between the first and last cell reading. Industrial temperature range and a robust CMOS process make this part suitable for traction, e-bike, and stationary battery packs.
Recommandé
Portable Instrumentation
Hand-held digital multimeters, data loggers, and field-portable test instruments use the TLC542IFNRG3 because it provides multi-channel 8-bit digitizing in a tiny PLCC-20 package while drawing modest power from a battery. The serial interface lets the host microcontroller sleep between conversions to extend battery life. The 25 kSPS sample rate easily captures audio-bandwidth signals and DC measurements, and the on-chip multiplexer lets a DMM handle voltage, current, and temperature channels through one ADC.
Recommandé
Consumer Appliance Control
Washing machines, dishwashers, ovens, and HVAC controllers integrate the TLC542IFNRG3 to read multiple sensor inputs (water temperature, drum speed, door switches, humidity, motor current) using a small MCU. The -40C to +85C industrial operating range covers all consumer and light-industrial appliance environments, while the 8-bit resolution is sufficient for thermostat-style control loops and motor-speed monitoring. The PLCC-20 package eases hand-rework and supports low-cost through-hole sockets used by service technicians.
Recommandé
Isolated Data Acquisition Module
In isolated multi-channel data acquisition modules that send readings back to a host PC over RS-485 or CAN, the TLC542IFNRG3 serves as the front-end ADC on the field side of the isolation barrier. Its serial interface pairs naturally with digital isolators that only need to forward a single bit-stream rather than a wide parallel bus, cutting isolator cost and PCB area. Engineers commonly build 8-channel or 16-channel expansion modules by stacking two TLC542IFNRG3 devices behind a single digital isolator.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TLC542IFNRG3 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | TLC542IFN | TLC542IN | TLC1542IFNG3 | TLC540IFNRG3 |
|---|---|---|---|---|---|
| Package | PLCC-20 (9x9 mm) | PDIP-20 (same package family, different package) | PDIP-20 (different package) | PLCC-20 (same package) | PLCC-20 (same package) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bits | 8 bits | 8 bits | 8 bits (different family) | 8 bits |
| Sampling Rate | 25 kSPS | 25 kSPS | 25 kSPS | 25 kSPS | 25 kSPS |
| Input Channels | 11 | 11 | 11 | 11+ (extended family) | 1 (no mux) |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Conversion Time | 20 us | 20 us | 20 us | 20 us | 20 us |
| Data Interface | Serial (3-state) | Serial (3-state) | Serial (3-state) | Serial (3-state, family variant) | Serial (3-state) |
| Linearity Error (max) | 0.1953 % | 0.1953 % | 0.1953 % | 0.1953 % | 0.1953 % |
Principaux différenciateurs
- On-chip 11-channel analog multiplexer eliminates external analog switches (vs TLC540IFNRG3)
- Industrial -40C to +85C temperature range (vs TLC542IN)
- PLCC-20 surface-mount package with low-cost socket compatibility (vs PDIP-20 (TLC542IN / TLC542IFN))
Notes de conception
Estimated: decoupling analysis for TLC542IFNRG3 - place a 0.1 uF ceramic capacitor as close as possible to the VCC pin (pin 15 in this pinout assumption) and to the REF+ pin (pin 9). The SAR ADC generates fast current pulses on VCC during the bit-trial phase; lack of good decoupling causes dynamic reference sag and degraded linearity. A bulk 1-10 uF tantalum or ceramic decoupling capacitor near the part further stabilizes the supply during burst-mode conversions.
Estimated: layout recommendation - keep analog input traces short and routed away from the I/O CLOCK and SERIAL DATA traces to minimize digital-to-analog crosstalk. Place a ground pour under the ADC and connect the ADC's GND pin directly to the analog ground system; reference the digital ground near the host MCU. The PLCC-20 socket footprint lets designers use a low-profile machined-pin socket for prototype rework while keeping the production PCB compatible with reflow-soldered PLCC.
Engineers commonly overlook that the TLC542IFNRG3 uses time-multiplexed serial transfers - the host writes the next channel address on the same clock edges where the previous conversion result is read out. Newcomers often forget to drive the ADDRESS pin during the read and end up digitizing the wrong channel. Always re-initialize the converter after power-up with a dummy read cycle to flush the internal state and discard the first sample because the first post-reset conversion is typically from an uninitialized address latch.
Informations de conformité
RoHS, REACH, halogen-free, and conflict-mineral status not explicitly listed in the verified web data for TLC542IFNRG3; lead-free plating is implicit from the F-suffix (Pb-free) marker in the MPN. Confirm full compliance flags with the TI product page or distributor before placing volume production orders.
