AD8223BRMZ - Single-Supply Rail-to-Rail INA, 200kHz | Analog Devices
N.º de pieza: AD8223BRMZ ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.89 | $4,89 |
| 10 | $4.41 | $44,10 |
| 100 | $3.71 | $371,00 |
| 500 | $3.05 | $1.525,00 |
| 1.000 | $2.65 | $2.650,00 |
AD8223BRMZ Descripción general
An instrumentation amplifier is a precision differential amplifier that combines high common-mode rejection ratio (CMRR), high input impedance, and a user-programmable gain set by a single external resistor. The AD8223 belongs to the broad category of linear amplifier ICs (hypernyms: instrumentation amplifier -> precision amplifier -> operational amplifier -> analog IC -> semiconductor), and within Analog Devices' portfolio it occupies the entry-level low-cost node above discrete op-amp solutions.
Key specifications include 25 nA maximum input bias current, 30 nV/√Hz input-referred (RTI) noise density at 1 kHz, 80 dB minimum CMRR at unity gain (DC to 1 kHz), and a gain range of 5 to 1000 set by one external resistor (G = 5 + 80 kΩ/RG per Analog Devices datasheet). The 8-MSOP (RM) package is footprint-compatible with the industry-standard 8-pin in-amp pinout, enabling direct PCB drop-in replacement for legacy AD620-class designs where higher bandwidth and single-supply operation are required.
The AD8223 uses a classic three-op-amp topology with thin-film resistor laser trimming to deliver CMRR performance that exceeds many competing low-cost in-amps. The rail-to-rail output stage swings within millivolts of either supply rail, making it ideal for driving single-supply ADCs without level shifting. The 25 nA bias current enables direct connection to high-impedance sensor bridges.
Typical applications include pressure and temperature bridge amplification, ECG and biomedical front-ends, weigh scales, and industrial process-control transducer signal conditioning. In weigh-scale designs, the low noise floor and high CMRR allow direct connection to a 350 Ω load cell without instrumentation buffer stages.
Designers should note the supply-decoupling recommendation: a 0.1 µF ceramic capacitor placed within 5 mm of the supply pin is essential for stable operation. The REF pin allows output level shifting for single-supply ADC interfaces and must be driven from a low-impedance source (< 5 Ω) for best CMRR performance.
This page synthesizes distributor pricing, parametric drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, and is engineered for AI-search citation as well as human engineer review.
Alternativas directas para AD8223BRMZ — 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:
AD8223BRMZ-R7
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8223BRMZ-RL
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8223ARMZ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AD620ANZ
✅ Sustitución directa✓ En stock
$6.2 / unidad
Ver hoja de datos →INA333AIDGKR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AD8223BRMZ Valores máximos y características eléctricas
| Product Type | Instrumentation Amplifier (INA) |
| Topología | 3-op-amp, single-resistor gain set |
| Number of Channels | 1 |
| Supply Voltage (Single) | +3.0 V to +25 V |
| Supply Voltage (Dual) | ±1.5 V to ±12.5 V |
| Bandwidth (G=5) | 200 kHz |
| Gain Range | 5 to 1000 (external resistor) |
| Default Gain (no RG) | 5 |
| Input Bias Current (max) | 25 nA |
| Input-Referred Noise Density | 30 nV/√Hz at 1 kHz |
| Rango de tensión de entrada | 150 mV below negative rail to +Vs |
| Output Swing | Rail-to-rail |
| CMRR (min) | 80 dB at DC-1 kHz (G=1) |
| Rango de temperatura de funcionamiento | -40 °C to +85 °C |
| Encapsulado | 8-MSOP (RM), 3.00 mm body width |
| Tipo de montaje | Surface Mount |
| Nivel MSL | 1 |
| Lead-Free / RoHS | Yes / ROHS3 compliant |
Configuración de pines de AD8223BRMZ
| Pin 1 | RG — Gain-setting resistor pin. Connect external RG between pins 1 and 8 to set G = 5 + 80 kΩ/RG. Leave open for default G = 5. |
| Pin 2 | -IN — Negative (inverting) differential input |
| Pin 3 | +IN — Positive (non-inverting) differential input |
| Pin 4 | -Vs — Negative supply (ground for single-supply operation) |
| Pin 5 | REF — Reference voltage input for output level shifting. Drive from low-impedance source (< 5 Ω) for best CMRR. ESD-protected; should not exceed ±Vs by more than 0.3 V. |
| Pin 6 | OUTPUT — Amplified output. Rail-to-rail swing relative to REF. |
| Pin 7 | +Vs — Positive supply. +3 V to +25 V for single-supply operation. |
| Pin 8 | SENSE — Sense pin for gain-setting resistor return. Connect to RG and pin 1. |
Aplicaciones típicas
AD8223BRMZ es adecuado para 7 aplicacións: Weigh Scale & Load Cell Amplifier, Industrial Pressure Transducer Front-End, ECG & Biomedical Signal Conditioning, Thermocouple & RTD Temperature Amplifier, Battery-Powered Portable Instrumentation, Audio Preamplifier & Balanced Line Receiver, Current Sensing & Power Monitor.
Weigh Scale & Load Cell Amplifier
The AD8223BRMZ is ideal for weigh-scale signal conditioning where a 350 Ω or 1 kΩ strain-gauge bridge produces a millivolt-level differential output that must be amplified to a 0-5 V ADC input range. The 200 kHz bandwidth and 80 dB minimum CMRR at unity gain reject mains-frequency common-mode pickup that otherwise dominates bridge readings. With G=100 set by RG ≈ 842 Ω, the 25 nA bias current draws negligible current from the high-impedance bridge, preserving linearity. The rail-to-rail output drives the ADC directly without a level-shifting buffer, saving board space.
Recomendado
Industrial Pressure Transducer Front-End
The AD8223BRMZ delivers the bandwidth, low bias current, and rail-to-rail output required for industrial pressure and flow transducers with 4-20 mA current-loop outputs or bridge-based sensors. Operating from a single +24 V industrial supply rail, it amplifies the millivolt differential bridge signal and references the output to mid-supply for direct ADC input. The 80 dB minimum CMRR rejects ground-loop noise that is prevalent in factory environments with motor drives and switching inverters. Industrial temperature grade (-40 to +85 °C) supports outdoor and panel-mount installations.
Recomendado
ECG & Biomedical Signal Conditioning
The AD8223BRMZ is widely used in ECG, EMG, and other biopotential measurement front-ends where high CMRR (80 dB) rejects 50/60 Hz power-line interference and the 25 nA max input bias current minimizes DC electrode polarization effects that distort low-frequency ECG waveforms. The rail-to-rail output drives a single-supply 0-3.3 V ADC directly, eliminating the level-shifting op-amp that dual-supply in-amps require. With a typical 0.5-10 Hz passband for ECG, the 200 kHz bandwidth is far in excess of signal requirements, providing excellent transient response to defibrillator pulses and lead-fail detection events.
Recomendado
Thermocouple & RTD Temperature Amplifier
The AD8223BRMZ amplifies the µV-level signals from K-type, J-type, or other thermocouples, as well as the ratiometric output of RTD bridge circuits. With programmable gain up to 1000, a single 40 µV/°C K-type thermocouple output is amplified to 40 mV/°C at G=1000, well above ADC noise floor. The 150 mV below-rail input range accepts thermocouple negative-voltage outputs when the circuit ground is set above the thermocouple cold-junction reference. Combined with an external cold-junction compensation sensor, this forms a complete thermocouple-input temperature measurement subsystem.
Recomendado
Battery-Powered Portable Instrumentation
The AD8223BRMZ operates from as low as +3.0 V single supply, making it ideal for battery-powered handheld multimeters, data loggers, and portable measurement instruments where the rail-to-rail output maximizes dynamic range on a 3.3 V ADC. With 0.5 mA quiescent current, it draws less than 1% of total system power in a typical portable instrument. The wide supply range up to +25 V also supports industrial 24 V loop-powered designs, allowing the same in-amp platform across battery and line-powered product variants.
Recomendado
Audio Preamplifier & Balanced Line Receiver
The AD8223BRMZ with its 80 dB minimum CMRR performs excellently as a balanced audio line receiver for professional audio equipment, rejecting ground-loop hum and EMI pickup on long cable runs. Programmable gain from 5 to 1000 accommodates microphone-level (-60 dBV) to line-level (+4 dBu) signals without a separate preamp stage. The 200 kHz bandwidth covers the full 20 Hz to 20 kHz audio band with substantial headroom for transient peaks, while the low 30 nV/√Hz input noise floor preserves dynamic range in high-gain microphone preamp applications.
Recomendado
Current Sensing & Power Monitor
The AD8223BRMZ amplifies the small voltage drop across a low-side or high-side shunt resistor in motor control, solar inverter, and battery management current-sensing applications. With its 200 kHz bandwidth it accurately tracks PWM switching currents at frequencies up to several kHz, and the rail-to-rail output drives a 0-3.3 V ADC directly. High CMRR rejects the large common-mode voltage transients present in high-side current sensing. For precise low-current sensing the 25 nA max bias current minimizes error contribution from the in-amp itself.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AD8223BRMZ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AD8223BRMZ-R7 | AD8223BRMZ-RL | AD8223ARMZ | AD620ANZ | INA333AIDGKR |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Package | 8-MSOP (RM) | 8-MSOP (RM) - same | 8-MSOP (RM) - same | 8-MSOP (RM) - same | 8-pin in-amp pinout (MSOP/DIP/SOIC options) | 8-MSOP (DGK) - same |
| Supply Voltage (Single) | +3.0 V to +25 V | +3.0 V to +25 V | +3.0 V to +25 V | +3.0 V to +25 V | ±2.3 V to ±18 V (dual only) | +1.8 V to +5.5 V |
| Bandwidth (G=5) | 200 kHz | 200 kHz | 200 kHz | 200 kHz | 120 kHz | 150 kHz |
| Output Swing | Rail-to-rail | Rail-to-rail | Rail-to-rail | Rail-to-rail | No (Vs - 1.2 V typical) | Rail-to-rail (within 50 mV) |
| Gain Range | 5 to 1000 | 5 to 1000 | 5 to 1000 | 5 to 1000 | 1 to 1000 | 1 to 1000 |
| Input Bias Current (max) | 25 nA | 25 nA | 25 nA | 25 nA | 0.5 nA | 0.2 nA |
| Input-Referred Noise | 30 nV/√Hz at 1 kHz | 30 nV/√Hz | 30 nV/√Hz | 30 nV/√Hz | 9 nV/√Hz | 50 nV/√Hz |
| CMRR (min, DC-1 kHz, G=1) | 80 dB | 80 dB | 80 dB | 80 dB | 73 dB (G=10: 100 dB) | 100 dB |
| 1k-piece Unit Price (approx., as of 2026-10-06) | $2.65 USD | $2.65 USD | $2.65 USD | ~$3.00 USD | ~$5.50 USD | ~$3.20 USD |
Diferenciadores clave
- Single-supply rail-to-rail output with 200 kHz bandwidth (frente a AD620ANZ)
- Higher 200 kHz bandwidth vs TI cross-brand equivalents (frente a INA333AIDGKR)
- Lower cost than AD8421 premium in-amp with sufficient precision for industrial applications (frente a AD8421)
- Wide +25 V supply tolerance exceeds most cross-brand in-amps (frente a INA333AIDGKR)
Notas de diseño
Place a 0.1 µF X7R ceramic decoupling capacitor within 5 mm of the +Vs pin (pin 7) and another directly on -Vs (pin 4) to ensure stable operation across the +3 V to +25 V supply range. For applications with heavy digital switching noise on the same rail, add a 10 µF tantalum or aluminum polymer bulk capacitor near the IC. The REF pin should be driven from a low-impedance source (≤5 Ω); if REF is left floating, tie it to mid-supply through a buffer to prevent degraded CMRR.
Use a guard trace or ground plane around the input traces (pins 2 and 3) and the gain-setting resistor traces to minimize leakage currents and stray capacitance. Keep the RG trace length short (under 10 mm) and symmetrically routed between pins 1 and 8 to minimize parasitic capacitance that limits high-gain bandwidth. The MSOP-8 thermal pad should be soldered to a copper pour (at least 10 mm²) for thermal dissipation at high gain and high output current, although typical in-amp operation dissipates only tens of milliwatts.
For optimum CMRR performance (80 dB minimum, typically 90 dB+ at unity gain), the source impedances at +IN and -IN must be precisely matched (within 0.01% if possible). Any imbalance appears as a differential input to the in-amp and is amplified. If source impedance mismatch is unavoidable, add common-mode RC filtering at both inputs with matched component values. The 200 kHz bandwidth at G=5 implies a settling time of approximately 5 µs to 0.1%, so ADC sample timing must allow adequate acquisition windows when used in multiplexer applications.
Do not exceed the input common-mode range, which extends from 150 mV below -Vs to +Vs. Inputs above +Vs will forward-bias ESD protection diodes and inject current into the inputs, potentially damaging the IC or causing gain errors. The REF pin voltage must stay within ±Vs ± 0.3 V (ESD clamping limit). When using single-supply operation, connect -Vs to ground and drive REF to mid-supply (e.g., +Vs/2 via a resistor divider buffer) to allow bipolar input signal measurement centered at zero.
Información de cumplimiento
ROHS3 compliant per ICSuperMan distributor listing. Lead-free. Halogen-free status not stated in available data. Industrial temperature grade (-40 to +85 °C). Not AEC-Q100 qualified - this is not an automotive-grade part.
