TLC545ING4 - 8-Bit 76 kSPS ADC, 19-Ch Serial, 28-DIP | TI
Référence : TLC545ING4 ✗ Fin de vie| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $9.95 | $9,95 |
| 10 | $8.96 | $89,60 |
| 100 | $7.5 | $750,00 |
| 500 | $6.4 | $3 200,00 |
| 1 000 | $5.65 | $5 650,00 |
TLC545ING4 Présentation
An ADC (analog-to-digital converter) is a mixed-signal integrated circuit that converts a continuous analog voltage on one of its input pins into a discrete binary code. Successive-approximation ADCs like the TLC545ING4 use an internal binary-search algorithm combined with an internal DAC to resolve the input one bit at a time per clock cycle. In the broader taxonomy, the TLC545ING4 sits as: ADC -> data converter -> data acquisition IC -> mixed-signal IC -> semiconductor. The 8-bit resolution and integrated analog MUX place it in the low-cost, microcontroller-peripheral class of converters.
Key specifications include 8-bit resolution, 19 single-ended analog input channels, 76 kSPS maximum sampling rate (9 us typical conversion time), single +5 V analog supply, and a serial output interface. Operating temperature spans -40 C to +85 C (industrial grade). The on-chip analog multiplexer accepts 19 external inputs plus one self-test channel, dramatically reducing external analog switch circuitry in multi-channel data-acquisition systems.
The TLC545ING4's internal architecture combines a charge-redistribution DAC, successive-approximation register (SAR), and comparator. The serial interface uses four control lines (CS, I/O Clock, Address, Data Out) to communicate with virtually any host microcontroller. The device offers both hardware and software-controlled conversion modes and includes a built-in self-test mode for in-system diagnostics.
Typical applications include process control, factory automation, portable instrumentation, multi-channel data loggers, and embedded monitoring where a microcontroller needs to digitize many analog signals with minimal external components. The integrated 19-channel MUX eliminates the need for external analog switches in most multi-sensor systems.
When designing with the TLC545ING4, ensure the analog input source impedance is below the datasheet-specified maximum to avoid conversion errors from incomplete settling through the internal MUX and sample capacitor. Use the device's built-in self-test mode at power-up to validate the ADC core.
This page synthesizes distributor stock, drop-in pin-compatible alternatives, and design notes not collected in any single manufacturer document.
Alternatives de remplacement direct pour TLC545ING4 — 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 :
TLC545CNG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC545CN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC545IDW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC546IN
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC2551IDW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
TLC545ING4 Valeurs maximales et caractéristiques électriques
| Résolution | 8 bit |
| Number of Analog Input Channels | 19 (single-ended) + 1 self-test |
| Conversion Architecture | Successive Approximation (SAR) |
| Fréquence d'échantillonnage | 76 kSPS (max) |
| Conversion Time | 9 us (typical) |
| Analog Supply Voltage | 4.75 V to 5.25 V (5 V nominal) |
| Digital Supply Voltage | 4.75 V to 5.25 V |
| Data Interface | Serial (4-wire SPI-compatible) |
| Input Type | Single-Ended |
| Température de fonctionnement | -40 C to +85 C |
| Boîtier | 28-DIP (0.600 in / 15.24 mm) |
| Type de montage | Through-Hole |
| Packaging | Tube |
| Sample-and-Hold | On-chip |
| Self-Test Mode | Yes (on-chip) |
Configuration des broches de TLC545ING4
| 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 | AIN8 — Analog input channel 8 |
| Broche 10 | AIN9 — Analog input channel 9 |
| Broche 11 | AIN10 — Analog input channel 10 |
| Broche 12 | AIN11 — Analog input channel 11 |
| Broche 13 | AIN12 — Analog input channel 12 |
| Broche 14 | AIN13 — Analog input channel 13 |
| Broche 15 | AIN14 — Analog input channel 14 |
| Broche 16 | AIN15 — Analog input channel 15 |
| Broche 17 | AIN16 — Analog input channel 16 |
| Broche 18 | AIN17 — Analog input channel 17 |
| Broche 19 | AIN18 — Analog input channel 18 |
| Broche 20 | ST — Self-test mode select |
| Broche 21 | REF+ — Positive reference voltage input |
| Broche 22 | REF- — Negative reference voltage input (typically GND) |
| Broche 23 | VCC — Analog supply voltage, +5 V |
| Broche 24 | GND — Analog ground |
| Broche 25 | DOUT — Serial data output (MSB first) |
| Broche 26 | ADDRESS — Serial address input for channel select |
| Broche 27 | I/O CLK — Serial data clock input |
| Broche 28 | CS — Chip select (active low) |
Applications typiques
TLC545ING4 convient pour 6 applications: Multi-Channel Process Control, Portable Battery-Powered Instrumentation, Factory Automation Analog Input Modules, Multi-Channel Data Logger, Embedded Sensor Monitoring Boards, Automotive Aftermarket Sensor Readout.
Multi-Channel Process Control
The TLC545ING4's 19 single-ended analog inputs and 8-bit 76 kSPS throughput make it well-suited for industrial process-control front ends where many sensor signals (temperature, pressure, flow, level) must be digitized with a single MCU-side IC. Its integrated analog multiplexer eliminates external analog switch ICs, reducing BOM and PCB area in PLC and SCADA analog-input modules. The 5 V single-supply design simplifies power architecture. Place 100 nF ceramic bypass capacitors directly at VCC and REF pins, with a low-impedance 5 V reference such as the REF5040 driving REF+ for stable 8-bit readings across the -40 C to +85 C industrial operating range.
Recommandé
Portable Battery-Powered Instrumentation
The TLC545ING4 supports low-power portable data loggers and handheld instruments where the 5 V single-supply ADC interfaces directly to MCU ADC inputs or AREF pins. The 76 kSPS throughput is sufficient for slowly varying sensor signals (thermistors, RTDs, pH probes, load cells) without oversampling overhead. The 28-DIP package is convenient for hand-soldered prototypes and low-volume production. Drive CS high when idle to put the converter into a low-power standby; the SAR core draws negligible quiescent current between conversions, which helps extend battery runtime in remote sensor nodes.
Recommandé
Factory Automation Analog Input Modules
In factory automation PLC analog-input modules, the TLC545ING4 reads 4-20 mA loop signals after current-sense amplification or directly measures 0-5 V sensor outputs from proximity switches, photoelectric sensors, and limit switches. The on-chip 19-channel MUX allows a single ADC to service an entire analog input card. The serial interface simplifies isolation - a digital isolator such as ISO7741 between the ADC and the host MCU breaks ground loops common in 24 V industrial environments. Operate within the -40 C to +85 C industrial range and ensure REF+ bypass uses a 10 uF tantalum in parallel with a 100 nF ceramic per datasheet reference designs.
Recommandé
Multi-Channel Data Logger
The TLC545ING4's 19-channel MUX and 8-bit resolution are well-matched to multi-channel data loggers for environmental monitoring, HVAC telemetry, and energy metering where each channel records a slowly varying analog quantity. The 76 kSPS rate allows sequential scanning of all 19 channels at >4 kHz aggregate, more than adequate for temperature, humidity, light, and voltage monitoring. Pair with an SD-card interface for local storage or an Ethernet controller for remote telemetry. Use the on-chip self-test mode at power-up to validate ADC integrity before logging begins - this is a documented feature per the TI datasheet and is highly recommended for unattended field deployments.
Recommandé
Embedded Sensor Monitoring Boards
Educational and prototyping boards use the TLC545ING4 because the 28-PDIP through-hole package is easy to hand-solder on perfboard or breakout boards, and the 5 V supply simplifies integration with popular 5 V-tolerant microcontrollers such as the ATmega328P (Arduino Uno) or PIC18F4550. The 4-wire serial interface (CS, CLK, DOUT, ADDRESS) is bit-banged easily from any MCU. The 19 analog inputs allow students to wire up many sensors simultaneously without external multiplexers - ideal for IoT teaching kits and rapid prototyping. Pair with Arduino Uno for an immediate 5 V-compatible development environment.
Recommandé
Automotive Aftermarket Sensor Readout
The TLC545ING4's industrial -40 C to +85 C range and 19-channel MUX support aftermarket automotive sensor readout tools such as OBD-II scan tools, dynamometer interfaces, and engine diagnostic stations reading MAP, MAF, O2, throttle position, and coolant temperature sensors. While this part is NOT AEC-Q100 qualified (TLC545ING4 lacks automotive qualification), it is acceptable for non-safety, non-in-vehicle automotive test and measurement equipment. Use TVS diodes such as SMBJ5.0CA on every analog input to protect against load-dump transients common in vehicle electrical systems. Ensure the 5 V supply is isolated from vehicle 12 V/24 V battery transients with a wide-input DC-DC such as the LM2595.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour TLC545ING4 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | TLC545CNG4 | TLC545CN | TLC545IDW | TLC546IN | TLC2551IDW |
|---|---|---|---|---|---|---|
| Package | 28-DIP (0.600 in) | 28-DIP (0.600 in) - same | 28-DIP (0.600 in) - same | 28-SOIC (DW) - surface mount | 28-DIP (0.600 in) - same | 28-SOIC (DW) - surface mount |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 8 bit | 8 bit | 8 bit | 8 bit | 8 bit | 12 bit |
| Sampling Rate | 76 kSPS | 76 kSPS | 76 kSPS | 76 kSPS | 76 kSPS | 200 kSPS |
| Number of Analog Inputs | 19 + 1 self-test | 19 + 1 self-test | 19 + 1 self-test | 19 + 1 self-test | 4 + 1 self-test | 8 single-ended |
| Data Interface | Serial (4-wire) | Serial (4-wire) | Serial (4-wire) | Serial (4-wire) | Serial (4-wire) | Serial (SPI) |
| Supply Voltage | 5 V | 5 V | 5 V | 5 V | 5 V | 5 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Lifecycle Status | NRND | NRND | NRND | Active | NRND | Active |
Principaux différenciateurs
- Highest channel-count 8-bit SAR ADC in DIP-28 (vs TLC546IN)
- Industrial temperature grade for harsh environments (vs TLC545CN)
- Modern 12-bit performance upgrade available (vs TLC2551IDW)
Notes de conception
The TLC545ING4 requires a clean +5 V analog supply and a low-impedance reference. Place a 10 uF tantalum in parallel with a 100 nF ceramic directly at the VCC pin (pin 23) to decouple switching noise from the SAR conversion core. Use a precision reference such as REF5040 driving REF+ through a low-pass RC network (10 ohm + 10 uF) to keep reference noise below the 1-LSB threshold of the 8-bit converter. Avoid sharing the analog VCC trace with digital logic - star-ground the analog and digital grounds at the AGND pin (pin 24).
A common pitfall is using source impedances greater than 1 kohm on analog inputs - the internal MUX resistance plus sample capacitor (typically 14 pF) creates an RC settling time that exceeds the conversion window, causing gain and linearity errors. Use an external op-amp buffer (such as the OPA2333 with 5 mA drive capability) on each input if source impedance is high. Also, ensure CS toggles correctly between conversions - leaving CS asserted low with continuous I/O CLK cycles yields stale data and channel-mux aliasing. Always re-issue the address word at the start of each new conversion.
For the 28-PDIP through-hole package, keep analog input traces short and route them away from digital clock lines. Place a wide analog ground plane on the top or bottom layer directly under the IC and stitch with multiple vias around pin 24 (GND) to suppress ground bounce during SAR switching transients. If migrating to the SOIC-28 variant (TLC545IDW), increase the analog ground plane area beneath the exposed pad (if present) and route analog inputs orthogonally to digital output traces to minimize crosstalk.
Informations de conformité
G4 suffix in TLC545ING4 indicates lead-free (Pb-free) terminal finish per TI nomenclature. Not AEC-Q100 qualified - use TI's AEC-Q100-qualified ADC portfolio for automotive applications. RoHS and REACH compliance inferred from TI's standard compliance statements for G4-suffix parts; full certificates available from TI product compliance page.
