TLC4545IDGKRG4 - 16-bit 200kSPS Serial ADC | Texas Instruments
MPN: TLC4545IDGKRG4 ✓ Hoạt độngTLC4545IDGKRG4 Tóm tắt
A successive-approximation register (SAR) ADC is a sampling converter that resolves a single bit per clock cycle by comparing the sampled input against an internal binary-weighted DAC, achieving low latency (one conversion cycle), deterministic throughput, and inherent anti-alias robustness when paired with an external input RC. SAR ADCs sit between slow-precision integrating converters (e.g., 24-bit sigma-delta) and fast flash converters, occupying the dominant position in multiplexed data-acquisition, motor control, and industrial instrumentation where 12-to-18 bit resolution is needed at sample rates from 1 kSPS to 1 MSPS.
Key features include 200 kSPS throughput with a 2.94 µs maximum conversion time, ±1 LSB DNL (no missing codes), a serial data output (SDO) with chip-select (CS) and serial clock (SCLK), automatic power-down between conversions, and an internal 5 MHz serial clock requirement. The pseudo-differential input structure allows the converter to reject small common-mode ground noise between the analog source and the ADC ground, and the internal reference is ratiometric to VREF, simplifying system design.
The architecture combines a charge-redistribution capacitive DAC with a low-noise comparator and on-chip clock generator, achieving true 16-bit performance with no missing codes at 200 kSPS. The auto-power-down state reduces current between conversions, extending battery life in portable instruments. The serial interface minimizes host-side pin count and is directly compatible with most microcontrollers and DSP serial ports without glue logic.
Typical applications include portable data loggers, industrial process-control analog input modules, weigh-scale front ends, sensor signal conditioning, optical sensor read-out, motor control feedback, and general-purpose precision instrumentation. The pseudo-differential input also makes the device well-suited to thermocouple and bridge-sensor front ends when paired with an external instrumentation amplifier.
When designing with the TLC4545, keep the analog input traces short, place the input bypass capacitor (typically 10 µF tantalum + 0.1 µF ceramic) close to the analog supply pin, and provide a clean reference to VREF for ratiometric measurements. Note that the suffix "G4" indicates Pb-free reel packaging only - the silicon and electrical performance are identical to the standard TLC4545IDGKR variant.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Bộ thay thế dễ dàng lắp đặt cho TLC4545IDGKRG4 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với TLC4545IDGKRG4 (cùng hình factor và footprint) — khác nhau ở Input Type, Interface, Number of Channels, Operating Temperature Range, Package.
TLC4545IDGKR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TLC4545IDGK
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TLC4541IDGKR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ADS8320IDGKR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TLC2545IDGKR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
TLC4545IDGKRG4 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 16 bit |
| Sample Rate | 200 kSPS |
| Number of Channels | 1 |
| Architecture | SAR (Successive Approximation Register) |
| Input Type | Pseudo-Differential |
| Analog Supply Voltage | 5 V (single supply) |
| Maximum Conversion Time | 2.94 µs |
| Differential Nonlinearity (DNL) | ±1 LSB (no missing codes) |
| Giao diện | Serial (SPI/QSPI/Microwire-compatible) - 3-wire |
| Auto Power-Down | Yes (between conversions) |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C (industrial) |
| Hộp | 8-pin MSOP (DGK) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant (Pb-free green finish, G4) |
| Terminal Pitch | 0.65 mm |
| Reference Type | External, ratiometric to VREF |
| Analog Input Voltage Range | -0.2 V to VREF (single-ended) |
Cấu hình chân TLC4545IDGKRG4
| Chân 1 | AVDD — Analog supply voltage, 5 V nominal |
| Chân 2 | GND — Analog and digital ground |
| Chân 3 | REF — External voltage reference input (ratiometric) |
| Chân 4 | IN+ — Positive analog input (pseudo-differential) |
| Chân 5 | IN- — Negative analog input (pseudo-differential return) |
| Chân 6 | SCLK — Serial clock input |
| Chân 7 | SDO — Serial data output |
| Chân 8 | CS — Chip-select (active low) |
Ứng dụng tiêu biểu
TLC4545IDGKRG4 phù hợp cho 6 Áp dụngs: Portable Battery-Powered Data Loggers, Industrial Process Control Analog Input Modules, Weigh-Scale and Load Cell Front End, Optical Sensor and Photodiode Readout, Motor Control Feedback (Encoder / Current Sense), General-Purpose Precision Instrumentation.
Portable Battery-Powered Data Loggers
The TLC4545IDGKRG4 fits portable data-logger designs because of its 16-bit resolution, 200 kSPS throughput, single 5 V supply, and on-chip auto-power-down that drops quiescent current between conversions - drastically extending battery life in duty-cycled measurement cycles. Placed at the end of a sensor-front-end signal chain with an external reference (REF3140 at 4.096 V for ratiometric measurements), the ADC samples once every second and goes to sleep until the next trigger, achieving microamp-level average current draw from a single Li-ion cell. Its pseudo-differential input accepts a bridge or thermocouple-amplified signal directly, eliminating external instrumentation amplifiers. Cross-brand alternatives like the ADS8320 have lower sample rate but the TLC4545IDGKRG4's 200 kSPS headroom supports future oversampling-based resolution enhancement without a hardware redesign.
Được đề xuất
Industrial Process Control Analog Input Modules
In industrial process-control analog input modules, the TLC4545IDGKRG4 provides 16-bit precision with a pseudo-differential input that rejects small common-mode ground noise between field-side sensors and the controller. Its 200 kSPS throughput enables multiplexing up to 16 input channels via an external analog switch with one ADC shared, supporting process-control loops that demand sub-millisecond response. The 5 V analog supply and -40 to +85 °C industrial temperature grade suit PLC and DCS analog-front-end cards. The 3-wire SPI interface connects directly to most industrial MCUs (e.g., MSP430, STM32F4) without glue logic, simplifying layout and BOM. Pin-compatibility with the TLC4541 family allows drop-in interchangeability for single-ended field-side signals.
Được đề xuất
Weigh-Scale and Load Cell Front End
The TLC4545IDGKRG4 is well-suited to weigh-scale and load-cell analog front ends due to its 16-bit resolution, ±1 LSB DNL (no missing codes), pseudo-differential input, and ratiometric reference capability that cancels excitation drift. Placed after an INA128 instrumentation amplifier that converts the bridge signal to a 0-4.096 V single-ended output, the ADC samples at 200 kSPS, allowing the host to apply digital averaging filters to extract 18-bit effective resolution. The single 5 V supply simplifies power-tree design versus parts requiring 5 V analog + 3 V digital rails. The MSOP-8 package occupies minimal board area in compact retail scale electronics. Cross-brand parts like the Maxim MAX1149 can also serve this function but typically require more external components.
Được đề xuất
Optical Sensor and Photodiode Readout
The TLC4545IDGKRG4 provides 16-bit dynamic range at 200 kSPS for optical-sensor and photodiode-readout applications. Its pseudo-differential input accepts a transimpedance-amplified photodiode signal referenced to ground, while the on-chip sample-and-hold captures fast-pulse light signals. The 16-bit resolution is sufficient for pulse-oximeter SpO2 measurement and colorimeter absorbance calculations when paired with a precision OPA656 transimpedance amplifier. The 5 V supply directly powers the photodiode bias network without an extra LDO. Pin-compatibility with the TLC2545 12-bit version enables easy resolution upgrade by direct PCB swap when design maturity allows the higher-resolution variant.
Được đề xuất
Motor Control Feedback (Encoder / Current Sense)
The TLC4545IDGKRG4 serves motor-control feedback paths by sampling the shunt-resistor current-sense signal or encoder-pulse-derived analog voltage at up to 200 kSPS with 16-bit precision. Its pseudo-differential input rejects the large common-mode switching noise from the PWM drive stage when paired with an RC filter and a current-sense amplifier like the INA240. The single-cycle conversion latency of the SAR architecture eliminates pipeline delay in the current-control loop, enabling deterministic FOC (field-oriented control) cycle times. The MSOP-8 package is small enough to fit alongside the power-stage FETs in compact BLDC and PMSM drive boards.
Được đề xuất
General-Purpose Precision Instrumentation
The TLC4545IDGKRG4 is a versatile general-purpose 16-bit ADC for bench instruments, calibration equipment, and laboratory data-acquisition modules. Its 200 kSPS throughput, ±1 LSB DNL, and pseudo-differential input make it suitable for digitizing signals up to 100 kHz bandwidth with proper anti-alias filtering. The SPI-compatible 3-wire interface lets the host stream conversion results into a USB FIFO buffer without microcontroller intervention, simplifying USB oscilloscope and data-acquisition module designs. Pin-compatibility with the TLC4541 family allows OEM customers to swap input configurations without PCB changes. Cross-brand alternative like the Maxim MAX1149 offers slightly higher sample rate but at higher cost.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho TLC4545IDGKRG4 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | TLC4545IDGKR | TLC4545IDGK | TLC4541IDGKR | ADS8320IDGKR | TLC2545IDGKR |
|---|---|---|---|---|---|---|
| Package | MSOP-8 (DGK) | MSOP-8 (DGK) - same | MSOP-8 (DGK) - same | MSOP-8 (DGK) - same | MSOP-8 (DGK) - same | MSOP-8 (DGK) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Resolution | 16 bit | 16 bit | 16 bit | 16 bit | 16 bit | 12 bit |
| Sample Rate | 200 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 100 kSPS (-50%) | 200 kSPS |
| Input Type | Pseudo-Differential | Pseudo-Differential | Pseudo-Differential | Single-Ended | Single-Ended | Pseudo-Differential |
| Interface | Serial (3-wire SPI) | Serial (3-wire SPI) | Serial (3-wire SPI) | Serial (3-wire SPI) | Serial (SPI) | Serial (3-wire SPI) |
| Analog Supply | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single | 5 V single |
| Auto Power-Down | Yes | Yes | Yes | Yes | Yes | Yes |
| Pb-free / RoHS | Yes (G4 green) | Yes (Pb-free) | Yes | Yes (Pb-free) | Yes | Yes (Pb-free) |
| Operating Temperature | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C | -40 to +85 °C |
Bảo phân biệt quan trọng
- Highest sample rate in MSOP-8 SAR ADC family (vsADS8320IDGKR)
- Pseudo-differential input rejects common-mode ground noise (vsTLC4541IDGKR)
- Pb-free G4 green finish for lead-free reflow (vsTLC4545IDGK (non-green))
- 16-bit resolution versus 12-bit same-package alternatives (vsTLC2545IDGKR)
Ghi chú thiết kế
Place the analog supply decoupling capacitors (10 µF tantalum + 0.1 µF ceramic) as close as possible to the AVDD pin. Keep the AGND and DGND traces short and use a star-ground or single-point ground topology to prevent digital return currents from injecting noise into the analog ground reference. Place the REF bypass capacitor (typically 10 µF tantalum + 0.1 µF ceramic) directly across the REF pin to ground.
Use a small RC anti-alias filter (typically 100 Ω + 1 nF) between the signal source and the IN+/IN- pins. The -3 dB corner should be set to roughly 0.5× the sample rate (i.e., ~100 kHz for 200 kSPS) to prevent aliasing of high-frequency noise into the conversion bandwidth. Keep analog input traces short and symmetric in length to preserve common-mode rejection on the pseudo-differential pair.
Do not exceed the absolute maximum analog input voltage of VDD + 0.3 V or go below GND - 0.3 V - even brief transients beyond these rails can latch up the device. The IN- input is not floating; it must be driven to a defined DC potential (typically GND or a low-impedance midpoint). Note that 'auto power-down' reduces quiescent current between conversions but does not eliminate it - for true zero-current standby, control the AVDD rail with a low-leakage load switch.
Estimated: at 200 kSPS continuous conversion, the TLC4545IDGKRG4 draws approximately 2.5 mA from a 5 V supply, dissipating ~12.5 mW. With auto-power-down enabled and a 1 ms conversion interval, average current drops to ~50 µA. For battery-powered designs, calculate energy-per-sample (mA × V × time) rather than peak current, and budget the AVDD rail with a low-noise LDO (e.g., TPS7A4533) instead of switching regulators to prevent reference jitter.
Route the SPI traces (CS, SCLK, SDO) away from the analog input and reference traces. Use a ground guard trace between the digital SPI cluster and the analog IN+/IN- pair, or place them on opposite sides of the board. When using a microcontroller with internal pull-ups on the SPI lines, disable them or use external 100 kΩ pull-downs to prevent contention with the ADC's SDO driver during read cycles.
Thông tin tuân thủ
Pb-free green finish (G4 suffix) per TI's standard lead-free reflow compliance. RoHS compliant per TI product page. Not AEC-Q100 qualified - not intended for automotive safety-critical applications.
