TLC545ING4 - 8-Bit 76 kSPS ADC, 19-Ch Serial, 28-DIP | TI
料号： TLC545ING4 ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 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 概述
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.
直接替换替代料： TLC545ING4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TLC545CNG4
✅ 直接替换📋 参考替代料（不在目录中）
TLC545CN
✅ 直接替换📋 参考替代料（不在目录中）
TLC545IDW
✅ 直接替换📋 参考替代料（不在目录中）
TLC546IN
✅ 直接替换📋 参考替代料（不在目录中）
TLC2551IDW
✅ 直接替换📋 参考替代料（不在目录中）
TLC545ING4 最大额定值与电气特性
| 分辨率 | 8 bit |
| Number of Analog Input Channels | 19 (single-ended) + 1 self-test |
| Conversion Architecture | Successive Approximation (SAR) |
| 采样率 | 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 |
| 工作温度 | -40 C to +85 C |
| 封装 | 28-DIP (0.600 in / 15.24 mm) |
| 安装类型 | Through-Hole |
| Packaging | Tube |
| Sample-and-Hold | On-chip |
| Self-Test Mode | Yes (on-chip) |
TLC545ING4 引脚配置
| 引脚 1 | AIN0 — Analog input channel 0 |
| 引脚 2 | AIN1 — Analog input channel 1 |
| 引脚 3 | AIN2 — Analog input channel 2 |
| 引脚 4 | AIN3 — Analog input channel 3 |
| 引脚 5 | AIN4 — Analog input channel 4 |
| 引脚 6 | AIN5 — Analog input channel 5 |
| 引脚 7 | AIN6 — Analog input channel 6 |
| 引脚 8 | AIN7 — Analog input channel 7 |
| 引脚 9 | AIN8 — Analog input channel 8 |
| 引脚 10 | AIN9 — Analog input channel 9 |
| 引脚 11 | AIN10 — Analog input channel 10 |
| 引脚 12 | AIN11 — Analog input channel 11 |
| 引脚 13 | AIN12 — Analog input channel 12 |
| 引脚 14 | AIN13 — Analog input channel 13 |
| 引脚 15 | AIN14 — Analog input channel 14 |
| 引脚 16 | AIN15 — Analog input channel 15 |
| 引脚 17 | AIN16 — Analog input channel 16 |
| 引脚 18 | AIN17 — Analog input channel 17 |
| 引脚 19 | AIN18 — Analog input channel 18 |
| 引脚 20 | ST — Self-test mode select |
| 引脚 21 | REF+ — Positive reference voltage input |
| 引脚 22 | REF- — Negative reference voltage input (typically GND) |
| 引脚 23 | VCC — Analog supply voltage, +5 V |
| 引脚 24 | GND — Analog ground |
| 引脚 25 | DOUT — Serial data output (MSB first) |
| 引脚 26 | ADDRESS — Serial address input for channel select |
| 引脚 27 | I/O CLK — Serial data clock input |
| 引脚 28 | CS — Chip select (active low) |
典型应用
TLC545ING4 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： TLC545ING4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Highest channel-count 8-bit SAR ADC in DIP-28 （对比 TLC546IN)
- Industrial temperature grade for harsh environments （对比 TLC545CN)
- Modern 12-bit performance upgrade available （对比 TLC2551IDW)
设计说明
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.
合规信息
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.
