TLV2545IDGKR - 12-Bit 200 kSPS Serial ADC | Texas Instruments
N.º de pieza: TLV2545IDGKR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $3.65 | $3,65 |
| 10 | $3.28 | $32,80 |
| 100 | $2.91 | $291,00 |
| 500 | $2.62 | $1.310,00 |
| 1.000 | $2.33 | $2.330,00 |
TLV2545IDGKR Descripción general
An ADC (analog-to-digital converter) is a data-conversion integrated circuit that samples a continuous analog voltage and produces a discrete digital code, and a successive-approximation-register (SAR) ADC does so by iteratively comparing the input against an internal DAC, achieving an excellent balance of speed, accuracy, and power consumption for precision low-frequency and audio-bandwidth signals. The TLV2545 belongs to the broader hierarchy of data-converter ICs, which sit within signal-chain and power-management semiconductor families.
Key features of the TLV2545 include ±1 LSB maximum INL and DNL, 72 dB SINAD, and 85 dB SFDR at a 20 kHz input tone, along with a 3.5 µs typical conversion time and a flexible SCLK/FS-compatible serial interface. The autopower-down feature reduces current draw to a few microamps between conversions, which is critical for battery-powered and energy-harvesting applications where average load matters more than peak throughput.
The architecture uses a charge-redistribution SAR core with an internal sample-and-hold and on-chip oscillator, eliminating the need for an external clock. The pseudo-differential input stage simplifies board layout by accepting ground-referenced signals without a negative rail, while the wide supply range permits direct interface to 3.3 V microcontrollers, 5 V DSPs, or low-voltage battery stacks.
Typical applications include portable instrumentation, motor-control feedback loops, battery monitoring, sensor signal conditioning, point-of-load monitoring in industrial control, and audio-bandwidth digitization for consumer audio and telecommunications equipment. The 8-pin VSSOP footprint suits space-constrained designs.
When designing with the TLV2545, place 100 nF decoupling close to the supply pin and follow layout practices that keep digital return currents away from the analog input. The SCLK clock rate must remain within the 10 MHz SPI specification, and CS falling-edge timing relative to SCLK should be reviewed against the TMS320 interface diagrams in the datasheet.
This page synthesizes distributor pricing, drop-in same-package alternatives drawn from the same TI VSSOP-8 ADC family, and practical layout notes that go beyond what the manufacturer datasheet alone provides.
Alternativas directas para TLV2545IDGKR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con TLV2545IDGKR (mismo factor de forma y huella) — difiere en Package, Number of Channels, Architecture, Resolution, Data Interface.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
TLV2544IDGKR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2545IDGK
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2545IDGKG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2545CDGKG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2544IDGKG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
TLV2545IDGKR Valores máximos y características eléctricas
| Resolución | 12 bits |
| Sample Rate (Max) | 200 kSPS |
| Number of Input Channels | 1 (single-ended or pseudo-differential) |
| Architecture | SAR (Successive Approximation Register) |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Conversion Time (Typical) | 3.5 us |
| INL (Max) | ±1 LSB |
| DNL (Max) | ±1 LSB |
| SINAD | 72 dB (at fIN = 20 kHz) |
| SFDR | 85 dB (at fIN = 20 kHz) |
| Serial Interface | SPI/DSP-compatible (up to 10 MHz), TMS320-ready |
| Input Type | Pseudo-differential / single-ended |
| Temperatura de funcionamiento | -40 C to +85 C (Industrial) |
| Encapsulado | 8-pin VSSOP (DGK) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
Configuración de pines de TLV2545IDGKR
| Pin 1 | AVDD — Analog supply voltage |
| Pin 2 | REF+ — Positive reference voltage input |
| Pin 3 | IN — Analog input (single-ended or pseudo-differential positive) |
| Pin 4 | GND — Ground |
| Pin 5 | CS — Chip select (active low) |
| Pin 6 | DOUT — Serial data output |
| Pin 7 | SCLK — Serial clock input |
| Pin 8 | DVDD — Digital supply voltage |
Aplicaciones típicas
TLV2545IDGKR es adecuado para 6 aplicacións: Portable Instrumentation and Data Loggers, Industrial Sensor Signal Conditioning, Motor Control Current and Voltage Feedback, Battery Monitoring and Management, Audio Bandwidth Digitization, Point-of-Load Power Monitoring.
Portable Instrumentation and Data Loggers
The TLV2545IDGKR suits handheld multimeters, bench DMMs, and field data loggers where 12-bit resolution and 200 kSPS throughput are adequate but nanopower standby is mandatory. Its autopower-down mode drops supply current to a few microamps between conversions, extending battery life on a single 3 V coin or two-cell AA stack. Pseudo-differential input accepts ground-referenced transducer signals without a negative rail, while the SPI-compatible serial interface streams samples directly to a microcontroller for storage.
Recomendado
Industrial Sensor Signal Conditioning
In 4-20 mA loop-powered sensor interfaces, RTD/thermistor bridges, and strain-gauge front ends, the TLV2545IDGKR delivers 72 dB SINAD and ±1 LSB INL at 20 kHz, sufficient for process-control resolution. The wide 2.7 V to 5.5 V supply simplifies operation from 24 V loop-derived rails, and the industrial -40 to +85 C rating supports factory-floor environments. SPI/DSP-compatible output lets the converter hand data directly to a host MCU or DSP for closed-loop control.
Recomendado
Motor Control Current and Voltage Feedback
BLDC and stepper motor drives use the TLV2545IDGKR to digitize phase current and bus voltage with 12-bit accuracy at 200 kSPS, supporting PWM frequencies up to 25 kHz for closed-loop torque control. The 3.5 us conversion time allows synchronous sampling inside a single PWM period, while the pseudo-differential input tolerates ground bounce from switching FETs. The 8-pin VSSOP package fits compact integrated motor-driver boards where board area is at a premium.
Recomendado
Battery Monitoring and Management
In multi-cell battery-pack monitors for power tools, e-bikes, and UPS systems, the TLV2545IDGKR digitizes cell voltages with 12-bit resolution and 200 kSPS, enabling periodic cell balancing decisions. The 2.7 V to 5.5 V supply supports direct operation from a single Li-ion cell up to a 4S stack, while autopower-down minimizes quiescent draw when the pack is idle. SPI output connects directly to a battery-management MCU for state-of-charge algorithms.
Recomendado
Audio Bandwidth Digitization
For sub-20 kHz audio-band digitization in consumer headsets, intercoms, and voice-recognition front ends, the TLV2545IDGKR provides 72 dB SINAD and 85 dB SFDR, sufficient for 12-bit speech-quality capture. The SPI/DSP serial interface streams samples to an audio DSP at up to 200 kSPS, and the wide supply range permits direct connection to 3.3 V or 5 V audio DSPs. Pseudo-differential input accommodates single-ended microphone preamp outputs without a negative rail.
Recomendado
Point-of-Load Power Monitoring
In server and telecom point-of-load voltage monitoring, the TLV2545IDGKR senses POL output rails with 12-bit accuracy at 200 kSPS, enabling digital telemetry for PMBus-style health monitors. The pseudo-differential input simplifies routing around switching buck converters, and the VSSOP-8 footprint allows placement next to each rail for distributed monitoring. SPI output aggregates measurements into a master MCU without burdening the primary power-management bus.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para TLV2545IDGKR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | TLV2544IDGKR | TLV2545IDGK | TLV2545IDGKG4 | TLV2545CDGKG4 | TLV2544IDGKG4 |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | VSSOP-8 (DGK) | VSSOP-8 (DGK) - same | VSSOP-8 (DGK) - same | VSSOP-8 (DGK) - same | VSSOP-8 (DGK) - same | VSSOP-8 (DGK) - same |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| Sample Rate | 200 kSPS | 140 kSPS | 200 kSPS | 200 kSPS | 200 kSPS | 140 kSPS |
| Supply Voltage Range | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V | 2.7 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C (Commercial) | -40 C to +85 C |
| Conversion Time | 3.5 us | 5 us | 3.5 us | 3.5 us | 3.5 us | 5 us |
| SINAD | 72 dB | 72 dB | 72 dB | 72 dB | 72 dB | 72 dB |
Diferenciadores clave
- Higher throughput than TLV2544IDGKR at the same package and pinout (frente a TLV2544IDGKR)
- Industrial -40 to +85 C operating range (frente a TLV2545CDGKG4)
- Autopower-down for battery efficiency (frente a Generic SAR ADC without autopower-down)
Notas de diseño
Place a 100 nF decoupling capacitor as close as possible to the AVDD pin (pin 1) and another 100 nF close to the DVDD pin (pin 8); if the analog supply is particularly noisy, add a 10 uF bulk tantalum or ceramic in parallel. Keep digital return currents (SCLK, DOUT, CS) routed away from the analog input (pin 3) to prevent digital coupling into the SAR sampling network.
Use a small ground plane directly under the TLV2545IDGKR and connect the GND pin (pin 4) to it with a short, low-inductance trace. The reference input (REF+, pin 2) should be driven from a low-impedance source such as the TI REF5040 or a buffered bandgap; noise on REF+ appears directly as conversion noise. Place a 100 nF ceramic as close as possible to REF+ to suppress clock feedthrough.
The pseudo-differential input is ground-referenced; if the source has a high source impedance (above 1 kohm), add an external unity-gain buffer (for example OPA333 or TLV2371) between the source and the IN pin (pin 3). The SAR architecture draws instantaneous current spikes at the IN pin during conversion; insufficient source drive will degrade INL/DNL.
Do not exceed the maximum serial clock rate of 10 MHz; higher SCLK violates the SPI timing in the TI datasheet and causes data corruption on DOUT. When interfacing to a TMS320 DSP, ensure the FS signal timing and frame-sync setup/hold windows match the device's DSP-compatible timing mode, not the standard SPI mode, as documented in the datasheet timing diagrams.
Información de cumplimiento
RoHS compliant per TI product page. The TLV2545IDGKR is rated industrial -40 to +85 C and is not AEC-Q100 qualified; automotive designs should consult TI's automotive-grade portfolio.
