THS4551IRGTT - 150MHz Low-Noise Fully Diff Amplifier | Texas Instruments
N.º de pieza: THS4551IRGTT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $5.5 | $5,50 |
| 10 | $4.95 | $49,50 |
| 100 | $4.4 | $440,00 |
| 500 | $3.96 | $1.980,00 |
| 1.000 | $3.52 | $3.520,00 |
THS4551IRGTT Descripción general
A fully differential amplifier (FDA) is a specialized op-amp topology that converts a single-ended or differential input signal into a balanced differential output, where each output swings symmetrically around a programmable common-mode voltage. FDAs sit at the boundary between the analog front end (sensor/transducer) and the differential input stage of a high-speed ADC, and they are essential for maximizing spurious-free dynamic range (SFDR) and signal-to-noise ratio (SNR) in modern data-acquisition chains. Compared to a single-ended op-amp, an FDA inherently rejects common-mode noise from the analog supply, suppresses even-order harmonics, and directly interfaces with differential ADCs without lossy transformer coupling.
Key features of the THS4551IRGTT include a wide 2.7 V to 5.4 V single-supply operating range, a flexible output common-mode control input (VOCM) that supports direct DC coupling to the ADC common-mode voltage, low input bias current, integrated shutdown bias current control, and 8 kV HBM ESD protection. The device is characterized for operation across the industrial -40C to +125C temperature range and is fabricated in TI's proprietary high-speed complementary BiCMOS process. The 3x3 mm VQFN package exposes the thermal pad to a top-side copper pour, allowing continuous full-bandwidth operation at 5 V without exceeding the 175C junction limit.
Typical applications of the THS4551IRGTT include driving successive-approximation register (SAR) and delta-sigma ADCs in industrial process control, test and measurement data acquisition, high-density medical imaging front ends, and broadband communications baseband signal chains. Its low noise and high linearity also make it suitable for active balun replacement, audio line drivers, and I/Q modulator interface networks in software-defined radio (SDR) systems. When designing with this device, place the input and feedback network components as close to the IC pins as possible and follow the datasheet differential-input filter recommendations to preserve bandwidth and maximize SFDR; a small mismatch in the feedback resistors will degrade the common-mode rejection ratio (CMRR) at the frequency of interest, so 0.1% tolerance parts are recommended.
This page synthesizes distributor pricing, parametric drop-in alternatives, application-specific design notes, and pinout guidance not consolidated on the manufacturer datasheet front page.
Alternativas directas para THS4551IRGTT — 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 THS4551IRGTT (mismo factor de forma y huella) — difiere en Output Type, Package, Slew Rate.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
THS4561IRGTT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THS4521IRGTT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THS4509IRGTT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THS4511IRGTT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
LTC6409IUDB
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8138ACPZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
THS4551IRGTT Valores máximos y características eléctricas
| Product Type | Fully Differential Amplifier (FDA) |
| Canales | 1 Circuit, Differential |
| Tipo de salida | Differential, Rail-to-Rail |
| -3dB Bandwidth (G=1) | 150 MHz |
| Slew Rate | 200 V/us |
| Settling Time to 0.1% | 50 ns |
| Input-Referred Voltage Noise | 3.3 nV/sqrt(Hz) |
| THD+N (2 VPP, 100 kHz) | -100 dB |
| Supply Voltage Range (Single) | 2.7 V to 5.4 V |
| Corriente en reposo | 4.4 mA (typ) |
| Rango de temperatura de funcionamiento | -40C to +125C |
| ESD Protection (HBM) | 8 kV |
| Encapsulado | 16-pin VQFN (RGT) 3x3 mm with exposed thermal pad |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 2 (1 year) |
| Estado RoHS | Compliant |
| Lead-Free | Yes |
Configuración de pines de THS4551IRGTT
| Pin 1 | NC — Not connected (per datasheet) |
| Pin 2 | INP — Non-inverting differential input |
| Pin 3 | INN — Inverting differential input |
| Pin 4 | VDD — Positive power supply (2.7 V to 5.4 V) |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | NC — Not connected (per datasheet) |
| Pin 7 | PD — Power-down (active-low logic input) |
| Pin 8 | VOCM — Output common-mode voltage control input |
| Pin 9 | GND — Ground |
| Pin 10 | GND — Ground |
| Pin 11 | NC — Not connected (per datasheet) |
| Pin 12 | OUTN — Inverting differential output |
| Pin 13 | OUTP — Non-inverting differential output |
| Pin 14 | GND — Ground |
| Pin 15 | NC — Not connected (per datasheet) |
| Pin 16 | VDD — Positive power supply (2.7 V to 5.4 V) |
Aplicaciones típicas
THS4551IRGTT es adecuado para 6 aplicacións: 16/18-bit SAR ADC Driver, Industrial Process-Control Signal Chain, Test and Measurement Front End, Medical Imaging Receiver, Software-Defined Radio Baseband, Active Balun for Single-Ended to Differential Conversion.
16/18-bit SAR ADC Driver
The THS4551IRGTT directly drives 16-bit and 18-bit successive-approximation register ADCs (ADS8860, ADS8864, ADS8900B) with a DC-coupled interface. Its 50 ns settling to 0.1% and 200 V/us slew rate preserve the ADC's acquisition window for clean settling at the sample-and-hold, while its -100 dB THD+N at 2 VPP and 100 kHz maximizes SNR at high input frequencies. The internal VOCM control loop lets the user tie the ADC's common-mode output directly to the THS4551 VOCM pin, eliminating the lossy transformer or AC-coupling network. Compared to a discrete op-amp pair, the integrated FDA reduces PCB area by 50% and removes mismatch-induced even-order harmonics.
Recomendado
Industrial Process-Control Signal Chain
In a 4-20 mA loop-powered transmitter or strain-gauge signal conditioner, the THS4551IRGTT converts a small differential transducer signal to a high-level differential drive for the downstream ADC. Its 2.7 V to 5.4 V single-supply operation draws from the same 3.3 V or 5 V rail as the microcontroller, simplifying power tree design. Low 3.3 nV/sqrt(Hz) input noise preserves 18-bit resolution in the 0.1 Hz to 1 kHz instrumentation band, and its -40C to +125C industrial operating range supports factory-floor deployment. The VQFN-16 (RGT) 3x3 mm package is footprint-compatible with most precision-ADC EVMs, simplifying evaluation.
Recomendado
Test and Measurement Front End
Oscilloscope, spectrum analyzer, and data-acquisition front ends benefit from the THS4551IRGTT's 150 MHz analog bandwidth and rail-to-rail differential output. The FDA drives a high-speed differential ADC directly, with output common-mode controlled by the VOCM pin to match the ADC input range without external level shifters. At 50 ns settling to 0.1%, the THS4551 handles rapid full-scale transitions without glitching the measurement. Compared to transformer coupling, the FDA approach provides flat frequency response down to DC, eliminating the low-frequency droop that limits transformer-based solutions.
Recomendado
Medical Imaging Receiver
In ultrasound and medical-imaging receivers, the THS4551IRGTT conditions low-level differential transducer signals before digitization. Its -100 dB THD+N preserves the second-harmonic and intermodulation performance required for tissue-harmonic imaging, while the 200 V/us slew rate handles fast pulse returns without saturating. The single-supply 2.7 V to 5.4 V operation enables portable, battery-powered diagnostic equipment where rail count is at a premium. The 16-pin VQFN (RGT) 3x3 mm package allows dense multi-channel array layouts typical of ultrasound probe front ends.
Recomendado
Software-Defined Radio Baseband
The THS4551IRGTT drives the I and Q baseband ADCs in a software-defined radio receiver after the quadrature demodulator. Its 150 MHz bandwidth is well in excess of typical LTE and 5G NR channel bandwidths, providing ample headroom for adjacent-channel rejection filters. The -100 dB THD+N at 2 VPP / 100 kHz preserves EVM in the baseband path, which is critical for high-order modulation schemes (256-QAM and above). The VOCM pin aligns the differential output to the ADC's common-mode, eliminating AC-coupling capacitors in the baseband chain.
Recomendado
Active Balun for Single-Ended to Differential Conversion
The THS4551IRGTT serves as an active balun that converts a single-ended input to a balanced differential output for differential-input ADCs without lossy transformers. At 150 MHz, the FDA preserves bandwidth that narrowband transformers roll off, and it offers true DC response (transformers cannot pass DC). The integrated VOCM control simplifies the interface to the downstream ADC common-mode voltage, and the 3.3 nV/sqrt(Hz) input noise floor prevents the active balun from dominating system noise. The VQFN-16 (RGT) footprint is significantly smaller than a comparable RF transformer footprint on the PCB.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para THS4551IRGTT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | THS4561IRGTT | THS4521IRGTT | THS4509IRGTT | THS4511IRGTT | LTC6409IUDB | AD8138ACPZ |
|---|---|---|---|---|---|---|---|
| Package | VQFN-16 (RGT) 3x3 mm | VQFN-16 (RGT) 3x3 mm - same | VQFN-16 (RGT) 3x3 mm - same | VQFN-16 (RGT) 3x3 mm - same | VQFN-16 (RGT) 3x3 mm - same | QFN-16 (LFCSP-16) - same 16-pin QFN footprint | LFCSP-16 (QFN-16) - same 16-pin footprint |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices | Analog Devices |
| -3dB Bandwidth (G=1) | 150 MHz | 500 MHz | 145 MHz | 300 MHz | 2000 MHz | 10000 MHz | 320 MHz |
| Slew Rate | 200 V/us | 500 V/us | 100 V/us | 180 V/us | 1800 V/us | 4500 V/us | 1150 V/us |
| Input Voltage Noise | 3.3 nV/sqrt(Hz) | 4.3 nV/sqrt(Hz) | 4.0 nV/sqrt(Hz) | 5.0 nV/sqrt(Hz) | 2.0 nV/sqrt(Hz) | 1.1 nV/sqrt(Hz) | 5.0 nV/sqrt(Hz) |
| Supply Voltage Range | 2.7 V to 5.4 V | 2.7 V to 5.4 V | 2.5 V to 5.5 V | 2.7 V to 5.4 V | 3.0 V to 5.5 V | 2.7 V to 5.5 V | 3.0 V to 5.5 V |
| Quiescent Current (typ) | 4.4 mA | 9.6 mA | 1.5 mA | 3.8 mA | 38 mA | 52 mA | 20 mA |
| Output Common-Mode Control (VOCM) | Yes (integrated) | Yes | Yes | Yes | Yes | Yes | Yes |
| Power-Down Pin | Yes (PD, active-low) | Yes | No | Yes | Yes | No | No |
Diferenciadores clave
- Best-in-class noise/linearity balance for 16/18-bit ADC drive (frente a THS4561IRGTT)
- Lower quiescent current for power-constrained designs (frente a THS4511IRGTT)
- Integrated power-down pin for battery applications (frente a AD8138ACPZ)
Notas de diseño
Place the feedback resistors, gain-setting resistors, and the input RC anti-aliasing network as close as possible to the THS4551IRGTT pins to minimize parasitic capacitance and preserve the 150 MHz bandwidth. Use a 0.1% tolerance matched feedback resistor pair to maintain >70 dB common-mode rejection ratio at the frequency of interest. The exposed thermal pad (pin 17) must be soldered to a top-side copper pour of at least 25 mm^2 to keep junction temperature within the 175C limit at full output swing.
Maintain a 100 ohm differential output impedance by selecting feedback and gain resistors such that Rf/Rg yields the desired gain while terminating the differential output in a 100 ohm network at the ADC input. Mismatches in the resistor network translate directly into degraded harmonic distortion - a 1% mismatch can limit THD+N to -60 dB instead of the rated -100 dB. Reference the THS4551 datasheet Section 9.1 for the resistor-selection procedure and Section 9.2 for typical ADC interface schematics.
Decouple the VDD pins with a 0.1 uF X7R ceramic capacitor placed within 2 mm of each VDD pin, plus a 10 uF bulk tantalum or ceramic capacitor at the supply entry point. Use a separate analog ground pour connected to a single-point star ground with the ADC ground to avoid ground-loop noise coupling into the differential signal path. The THS4551IRGTT draws 4.4 mA typical, but the bias-current pin (PD) can be pulled high to enter a low-IQ shutdown mode (<10 uA) for battery-powered applications.
Do not leave the VOCM pin floating - tie it to the desired output common-mode voltage (typically midsupply or directly to the ADC common-mode reference) through a low-impedance source. A floating VOCM pin causes the output common-mode to drift and may saturate the downstream ADC input. Avoid driving the THS4551 with input signals exceeding the input common-mode range (typically VDD - 1.0 V at room temperature) to prevent input-stage distortion. Always verify the input common-mode range in the datasheet Figure 26 (Input Common-Mode Range vs Temperature).
Información de cumplimiento
RoHS compliant per TI product page. Industrial-grade part (-40C to +125C); no AEC-Q100 automotive variant in this package. Halogen-free status not explicitly stated in verified web data - set to unknown.
