AD8338ACPZ-R7 - 80dB Gain Range 18MHz VGA | Analog Devices
N.º de pieza: AD8338ACPZ-R7 ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.42 | $8,42 |
| 10 | $7.62 | $76,20 |
| 100 | $6.85 | $685,00 |
| 500 | $6.18 | $3.090,00 |
| 1.000 | $5.58 | $5.580,00 |
AD8338ACPZ-R7 Descripción general
A variable gain amplifier is an amplifier whose gain is set by an external control voltage, enabling automatic gain control (AGC) in systems where input signal levels vary widely. Within the amplifier IC hierarchy - amplifier > special purpose amplifier > VGA > signal conditioning IC - the AD8338 sits between a sensor or mixer front end and an ADC, scaling wide-dynamic-range signals to match converter full-scale. This makes the VGA category fundamental to ultrasound, radar, and communications receiver signal chains.
Key features include a wide gain range of 80 dB with linear-in-dB gain control via a single external GAIN pin voltage, low power consumption of approximately 3 mA supply current, and 18 MHz well-defined bandwidth from LF to 18 MHz. Fully differential inputs and outputs provide excellent common-mode rejection, and the device can also be driven single-ended with minimal external circuitry. A power-down pin conserves energy in duty-cycled battery-operated systems.
The AD8338 uses a proprietary X-AMP-style architecture achieving high linearity and low noise across the full gain range. The fully differential signal path minimizes even-order distortion and improves signal integrity, while low power consumption extends battery life in portable instruments such as handheld ultrasound scanners.
Typical applications include ultrasound time-gain compensation (TGC), radar and sonar receivers, communication receiver AGC loops, and industrial instrumentation front ends. In ultrasound, it amplifies weak deep-tissue echoes while attenuating strong near-field returns; in RF/IF receivers it optimizes dynamic range before digitization by the ADC.
Design tip: provide solid supply decoupling and keep the gain control node quiet - gain-control feedthrough directly converts GAIN-pin noise into output noise. Balance the differential source impedance for optimal CMRR performance across the band.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternativas directas para AD8338ACPZ-R7 — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AD8330ACPZ-RL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8330ACP-R2
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8475ACPZ-WP
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8338ACPZ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8338ACPZ-R7 Valores máximos y características eléctricas
| Función | Variable Gain Amplifier (VGA) |
| Canales | 1 |
| Gain Range | 80 dB |
| Bandwidth | LF to 18 MHz |
| Tensión de alimentación | 5 V (single supply) |
| Corriente de alimentación | Approx. 3 mA |
| Input/Output Topology | Fully differential (single-ended drive supported) |
| Gain Control | Linear-in-dB, single external GAIN pin voltage |
| Power-Down Feature | Yes (power-down pin) |
| Encapsulado | 16-lead LFCSP, 3 mm x 3 mm |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 3 (168 Hours) |
| Estado RoHS | RoHS3 Compliant |
| REACH Status | Unaffected |
| Packaging | Tape & Reel (R7 suffix) |
Guía de configuración de pines de AD8338ACPZ-R7 16-lead lfcsp, 3 mm x 3 mm
Configuración de pines para AD8338ACPZ-R7 (encapsulado 16-lead lfcsp, 3 mm x 3 mm). Este componente analógico presenta pines de entrada, salida y alimentación. Consulte la hoja de datos del fabricante para conocer las configuraciones de los pines de ajuste de offset, compensación y habilitación. Ideal para circuitos de acondicionamiento de señal y amplificadores.
No hay datos detallados de patillaje disponibles para AD8338ACPZ-R7.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
AD8338ACPZ-R7 es adecuado para 6 aplicacións: Ultrasound Time-Gain Compensation (TGC), Radar and Sonar Receivers, Communication Receiver AGC, Industrial Instrumentation Front Ends, Portable Battery-Powered Instruments, ADC Dynamic Range Optimization.
Ultrasound Time-Gain Compensation (TGC)
The AD8338ACPZ-R7 is a natural fit for ultrasound TGC because its 80 dB linear-in-dB gain range precisely compensates the amplitude spread between strong near-field echoes and weak deep-tissue returns, while the LF-to-18 MHz bandwidth covers the spectrum of typical diagnostic transducers. Placed after the low-noise front-end limiter and before the ADC driver, its gain is swept by a control voltage synchronized with transmit-receive depth timing. At approximately 3 mA from a single 5V rail, it suits battery-powered handheld and portable ultrasound systems, and the power-down pin cuts consumption between acquisitions, directly extending battery life in mobile imaging designs.
Recomendado
Radar and Sonar Receivers
In radar and sonar IF chains, return amplitude varies by orders of magnitude with target range and reflectivity, so an AGC stage is essential to keep the signal inside ADC full-scale. The AD8338's 80 dB gain range, linear-in-dB control law, and well-defined gain out to 18 MHz let a simple detector-and-integrator loop regulate output amplitude across the entire pulse-repetition cycle. The fully differential topology rejects common-mode pickup from nearby switching circuitry, improving sensitivity in compact receiver modules. Low approximately 3 mA consumption matters for battery- or towed-array sonar nodes, and the 3x3 mm LFCSP supports dense multi-channel beamformer boards.
Recomendado
Communication Receiver AGC
Communications receivers face fading channels in which the IF or baseband level can swing tens of decibels within milliseconds. The AD8338ACPZ-R7's linear-in-dB gain control makes loop-gain calculations straightforward: gain in dB tracks the GAIN-pin voltage linearly, so an RSSI-driven error amplifier closes the AGC loop with predictable settling. The 18 MHz well-defined bandwidth supports broadband IF stages, while the fully differential signal path minimizes even-order distortion that would otherwise create co-channel interference products. Single-ended drive capability simplifies interfacing with SAW filters and mixers, and the power-down pin conserves current in duty-cycled IoT and radio designs.
Recomendado
Industrial Instrumentation Front Ends
Industrial measurement systems - vibration analyzers, ultrasonic flow meters, and nondestructive test equipment - process sensor signals whose amplitude changes with distance, coupling, and material properties. The AD8338's 80 dB gain range lets one analog channel span signals that would otherwise require range switching, eliminating relay transients and calibration discontinuities. Its well-defined gain versus frequency from LF to 18 MHz simplifies system-level gain calibration, and the differential inputs reject ground noise common in factory environments. Operating from a single 5V rail shared with the digital system reduces supply-rail count, while the 3x3 mm LFCSP package fits dense multiplexed measurement cards.
Recomendado
Portable Battery-Powered Instruments
Handheld and battery-operated instruments benefit directly from the AD8338's approximately 3 mA supply current and power-down pin. In a duty-cycled measurement, the VGA is powered down between captures, cutting average consumption well below the active rating and extending battery runtime. The single 5V operation matches standard USB and one-cell-boosted rails, removing the need for negative supplies that other VGAs require. The compact 16-lead LFCSP (3x3 mm) footprint suits pen-style and wear form factors, and RoHS3 compliance with MSL 3 (168 hours) simplifies contract manufacturing for portable product lines sold into regulated markets.
Recomendado
ADC Dynamic Range Optimization
Placed immediately before a high-speed ADC, the AD8338ACPZ-R7 scales wide-dynamic-range signals to match converter full-scale, effectively adding its 80 dB analog gain range ahead of the converter's fixed quantization range. The fully differential outputs set the converter common-mode cleanly, minimizing second-order distortion, while the single-ended input drive option eases interfacing with filter outputs. Well-defined gain from LF to 18 MHz keeps the transfer function predictable for digital post-correction. A differential amplifier stage after the VGA provides final level shifting and isolation from ADC sampling glitches, producing a clean, high-dynamic-range acquisition channel.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD8338ACPZ-R7 — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD8330ACPZ-RL | AD8330ACP-R2 | AD8475ACPZ-WP | AD8338ACPZ |
|---|---|---|---|---|---|
| Package | 16-lead LFCSP (3x3 mm) | 16-lead LFCSP | 16-lead LFCSP | 16-lead LFCSP (3x3 mm) | 16-lead LFCSP (3x3 mm) - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Gain Range | 80 dB | 60 dB | 60 dB | Fixed (0.5x / 0.8x) | 80 dB |
| Gain Control | Linear-in-dB, single GAIN pin | Differential gain-control interface | Differential gain-control interface | None (fixed gain) | Linear-in-dB, single GAIN pin |
| Signal Path | Fully differential (single-ended drive supported) | Differential | Differential | Fully differential | Fully differential (single-ended drive supported) |
Diferenciadores clave
- Widest gain range in comparison set (frente a AD8330ACPZ-RL)
- Simple single-ended linear-in-dB gain control (frente a AD8330ACP-R2)
- True variable gain versus fixed attenuation (frente a AD8475ACPZ-WP)
- Trade-off: narrower maximum bandwidth (frente a AD8330ACPZ-RL)
Notas de diseño
Provide solid supply decoupling: place a 0.1 uF ceramic capacitor directly at the VPOS pin with an additional 1 uF to 10 uF bulk capacitor nearby, returned to a low-impedance ground plane. The LFCSP exposed pad should be soldered to a grounded copper pour with an array of vias - this provides both the ground return and thermal relief. Keep input and output differential traces as matched-length coupled pairs to preserve balance and CMRR.
Keep the GAIN control node quiet. Gain-control feedthrough converts any noise on the GAIN pin directly into output noise, so filter the control voltage with an RC network (for example 1 kOhm and 10 nF to 100 nF) close to the pin, and route the GAIN trace away from signal and clock lines. Balance the differential source impedance to maintain CMRR across the band. The RC corner also sets the AGC loop response when the control voltage comes from a detector-integrator loop.
Although inputs are differential, the AD8338 can be driven single-ended - but terminating the unused input correctly matters. Match the source impedance seen by both inputs so the internal balance is preserved; a floating complementary input degrades distortion and CMRR. Respect the 5V single-supply rating and set output common-mode per the datasheet recommendation when driving an ADC. Mind MSL 3 (168 hours) floor-life before reflow.
Información de cumplimiento
RoHS3 compliant and REACH unaffected per PartGenie compliance data. MSL 3 (168 hours). AEC-Q100 status not stated in provided data - not_applicable pending verification.
