TLC4545IDGKRG4 - 16-bit 200kSPS Serial ADC | Texas Instruments
부품 번호: TLC4545IDGKRG4 ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.08 | $6,080.00 |
TLC4545IDGKRG4 개요
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.
드롭인 대체품: TLC4545IDGKRG4 — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: TLC4545IDGKRG4 (동일 폼 팩터 및 풋프린트) — 차이점: Input Type, Interface, Number of Channels, Operating Temperature Range, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
TLC4545IDGKR
✅ 드롭인✓ 재고 있음
$2.89 / 개
데이터시트 보기 →TLC4545IDGK
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
TLC4541IDGKR
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
ADS8320IDGKR
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
TLC2545IDGKR
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
TLC4545IDGKRG4 최대 정격 & 전기적 특성
| 분해능 | 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) |
| 인터페이스 | Serial (SPI/QSPI/Microwire-compatible) - 3-wire |
| Auto Power-Down | Yes (between conversions) |
| 동작 온도 범위 | -40 °C to +85 °C (industrial) |
| 패키지 | 8-pin MSOP (DGK) |
| 실장 유형 | Surface Mount |
| RoHS 상태 | 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) |
TLC4545IDGKRG4 핀 구성
| 핀 1 | AVDD — Analog supply voltage, 5 V nominal |
| 핀 2 | GND — Analog and digital ground |
| 핀 3 | REF — External voltage reference input (ratiometric) |
| 핀 4 | IN+ — Positive analog input (pseudo-differential) |
| 핀 5 | IN- — Negative analog input (pseudo-differential return) |
| 핀 6 | SCLK — Serial clock input |
| 핀 7 | SDO — Serial data output |
| 핀 8 | CS — Chip-select (active low) |
일반적인 애플리케이션
TLC4545IDGKRG4 적합 용도: 6 애플리케이션s: 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.
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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.
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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.
추천
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.
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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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: TLC4545IDGKRG4 — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Highest sample rate in MSOP-8 SAR ADC family (vs ADS8320IDGKR)
- Pseudo-differential input rejects common-mode ground noise (vs TLC4541IDGKR)
- Pb-free G4 green finish for lead-free reflow (vs TLC4545IDGK (non-green))
- 16-bit resolution versus 12-bit same-package alternatives (vs TLC2545IDGKR)
설계 노트
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.
규정 준수 정보
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.
