AD8223BRMZ - Single-Supply Rail-to-Rail INA, 200kHz | Analog Devices
MPN: AD8223BRMZ ✓ Hoạt độngAD8223BRMZ Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho AD8223BRMZ — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với AD8223BRMZ (cùng hình factor và footprint) — khác nhau ở Gain Range, Package, Product Type, Mounting Type, Number of Channels.
AD8223BRMZ-R7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD8223BRMZ-RL
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
AD8223ARMZ
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
AD620ANZ
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →INA333AIDGKR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →AD8223BRMZ Tỷ lệ tối đa & tính chất điện
| Product Type | Instrumentation Amplifier (INA) |
| Cấu trúc | 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 |
| Phạm vi điện áp đầu vào | 150 mV below negative rail to +Vs |
| Output Swing | Rail-to-rail |
| CMRR (min) | 80 dB at DC-1 kHz (G=1) |
| Khoảng nhiệt độ hoạt động | -40 °C to +85 °C |
| Hộp | 8-MSOP (RM), 3.00 mm body width |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 |
| Lead-Free / RoHS | Yes / ROHS3 compliant |
Cấu hình chân AD8223BRMZ
| Chân 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. |
| Chân 2 | -IN — Negative (inverting) differential input |
| Chân 3 | +IN — Positive (non-inverting) differential input |
| Chân 4 | -Vs — Negative supply (ground for single-supply operation) |
| Chân 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. |
| Chân 6 | OUTPUT — Amplified output. Rail-to-rail swing relative to REF. |
| Chân 7 | +Vs — Positive supply. +3 V to +25 V for single-supply operation. |
| Chân 8 | SENSE — Sense pin for gain-setting resistor return. Connect to RG and pin 1. |
Ứng dụng tiêu biểu
AD8223BRMZ phù hợp cho 7 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho AD8223BRMZ — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Single-supply rail-to-rail output with 200 kHz bandwidth (vsAD620ANZ)
- Higher 200 kHz bandwidth vs TI cross-brand equivalents (vsINA333AIDGKR)
- Lower cost than AD8421 premium in-amp with sufficient precision for industrial applications (vsAD8421)
- Wide +25 V supply tolerance exceeds most cross-brand in-amps (vsINA333AIDGKR)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
