ISO122P - Precision 50kHz Isolation Amplifier | Texas Instruments
N.º da peça: ISO122P ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
ISO122P Visão geral
An isolation amplifier is a signal-conditioning amplifier that electrically separates an input-side circuit from an output-side circuit while passing the measured signal. The ISO122P belongs to the isolation-amplifier, analog-amplifier, signal-conditioning, and power-management protection categories. Its isolation barrier supports designs where input and output grounds must remain separated for safety, fault containment, or prevention of ground-loop currents.
The principal verified features include 1500 Vrms high-voltage breakdown testing, fixed unity-gain configuration, bipolar operation from ±10 V, and compatibility with supply voltages from 4.5 V to 18 V. The low-side VS1 supply draws approximately 5 mA, while the VS2 supply uses approximately ±5.5 mA. Its 50 kHz bandwidth supports relatively fast process-control and instrumentation signals while the 0.020% maximum nonlinearity emphasizes accurate analog reproduction.
Internally, the ISO122P transmits the analog information by duty-cycle modulation and reconstructs it through synchronous demodulation. The barrier carries a differential capacitor signal rather than requiring a continuous analog signal to cross the isolation boundary. Digital modulation helps the barrier characteristics have less influence on signal integrity. The device uses a fixed unity-gain architecture, simplifying external gain-setting design.
Typical applications include industrial process-control loops, current-shunt measurements, sensor interfaces, data acquisition, power-inverter feedback, and isolated analog signal conditioning. In each case, the design must maintain adequate supply headroom, observe the specified isolation and layout requirements, and account for the 50 kHz bandwidth before selecting external filtering.
A key design consideration is that the DIP package is not interchangeable with the separate 28-lead surface-mount ISO122 option without a PCB footprint change. Keep high-voltage and low-voltage copper areas separated, place bypass capacitors close to the supply pins, and treat the isolation barrier and input common-mode limits as layout constraints rather than ordinary analog routing concerns.
This page combines the manufacturer specifications, verified distributor availability information, package details, and application guidance to support component selection and PCB design. Pricing and stock must be checked against current distributor listings as of 2026-10-22 rather than inferred from generic marketplace records.
Alternativas drop-in para ISO122P — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com ISO122P (mesmo formato e footprint) — diferindo em Gain Configuration, Mounting Type, Input Offset-Voltage Drift, Number of Channels, Package.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
ISO122U
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
Consulte o preço
Ver ficha técnica →ISO122
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
ISO122P Classificações máximas e características elétricas
| Product Type | Precision isolation amplifier |
| Number of Circuits | 1 circuit |
| Maximum Nonlinearity | 0.020% |
| Signal Bandwidth | 50 kHz |
| Input Offset-Voltage Drift | 200 V/°C maximum |
| Power Supply Range | 4.5 V to 18 V |
| VS1 Quiescent Current | 5 mA |
| VS2 Quiescent Current | ±5.5 mA |
| Bipolar Supply Operation | ±10 V |
| High-Voltage Breakdown Rating | 1500 Vrms |
| Isolation Method | Duty-cycle modulation and demodulation |
| Differential Capacitive Barrier | 2 pF |
| Gain Configuration | Fixed unity gain |
| ISO122P Package | 8-pin plastic DIP |
| Tipo de montagem | Through-hole |
| Single-Supply Operation | Supported on the high-voltage side with a 5.1 V Zener-generated negative supply |
| High-Voltage Testing | 100% tested for rated high-voltage breakdown |
Guia de Configuração de Pinos do ISO122P 8-pin plastic dip
Configuração de pinos para ISO122P (pacote 8-pin plastic dip). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para ISO122P.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
ISO122P é adequado para 8 aplicaçãos: Industrial Process-Control Loops, Current-Shunt Measurement Interfaces, Industrial Sensor Signal Conditioning, Power-Inverter Feedback, Data-Acquisition Front Ends, Instrumented Power-Supply Feedback, Portable Test and Measurement, Bipolar Analog Signal Transmission.
Industrial Process-Control Loops
The ISO122P fits low-frequency process-control feedback because it combines a verified 50 kHz signal bandwidth with 0.020% maximum nonlinearity and fixed unity gain. Place it between a field-side sensor or transmitter and a grounded controller input so that the two domains remain electrically separated. Its 1500 Vrms high-voltage breakdown rating supports reinforced isolation design work, while ±10 V bipolar operation suits conventional analog control electronics. The important trade-off is bandwidth: control signals containing substantial energy above 50 kHz require a faster isolation amplifier rather than filtering that cannot restore information already removed.
Recomendado
Current-Shunt Measurement Interfaces
Use ISO122P when a millivolt-level shunt voltage must cross from a noisy high-current power stage into a precision measurement system. Its 200 V/°C maximum input offset-voltage drift and 0.020% maximum nonlinearity are useful when maintaining calibration over temperature, while the 50 kHz bandwidth can capture dynamic current information in moderate-bandwidth control loops. Because the gain is fixed at unity, the input network must scale the shunt signal appropriately. Keep shunt-side traces short and isolated from switching-node copper to prevent common-mode and ground-current errors from reaching the barrier.
Recomendado
Industrial Sensor Signal Conditioning
ISO122P is suitable for transmitting a conditioned analog sensor output across an isolation boundary in industrial monitoring equipment. Its 4.5 V to 18 V supply range accommodates conventional analog rails, and the fixed unity-gain architecture removes the need for an external feedback network. A sensor such as a pressure bridge or temperature transducer can feed the input when its output range, common-mode voltage, bandwidth, and grounding satisfy the ISO122P requirements. The supply bypass network should follow the manufacturer layout, while creepage and clearance on the barrier must remain uninterrupted to preserve the intended isolation function.
Recomendado
Power-Inverter Feedback
ISO122P can isolate inverter control feedback where the measured signal bandwidth remains below 50 kHz and precision amplification is required. The fixed unity gain and 0.020% maximum nonlinearity help preserve command and feedback information without adding a user-set feedback network. The 200 V/°C maximum offset drift also supports temperature-sensitive power-control designs. Layout is critical: route the sensed voltage or current away from high-dv/dt switching traces, keep the barrier copper free of bridging nets, and provide local supply bypassing on both sides. Faster inverter dynamics may exceed ISO122P bandwidth.
Recomendado
Data-Acquisition Front Ends
The ISO122P fits low-frequency data-acquisition channels requiring galvanic separation between instrumentation and host electronics. Its 50 kHz bandwidth supports moderately dynamic analog measurements, while the isolated barrier prevents input and output references from being tied together. Fixed unity gain simplifies channel design, although input scaling and anti-alias filtering remain external functions. The single channel is sufficient for isolated voltage, current, or position feedback where cost and simplicity are priorities. Validate the complete channel gain, bandwidth, common-mode range, and barrier spacing rather than treating isolation as an automatic substitute for proper analog conditioning.
Recomendado
Instrumented Power-Supply Feedback
ISO122P is appropriate for isolated output-voltage feedback in lower-bandwidth laboratory and industrial power supplies. The 0.020% maximum nonlinearity supports accurate command transfer, while fixed unity gain permits a straightforward sensing network on the isolated side. Its 4.5 V to 18 V supply range can operate from common laboratory rails, and the manufacturer documents a single-supply high-side arrangement using a 5.1 V Zener-generated negative rail. Designers must still account for isolation capacitance, barrier creepage and clearance, common-mode transient stress, and the 50 kHz response limit before production release.
Recomendado
Portable Test and Measurement
ISO122P can isolate bench and portable instrumentation channels where safety or ground-loop prevention is important but signal bandwidth is no greater than 50 kHz. Fixed unity gain lowers circuit complexity, and the 8-pin DIP package is straightforward to prototype or replace through-hole. The isolation barrier helps keep hazardous-side currents out of the instrument ground, but it does not eliminate requirements for input protection, fusing, or safe working distances. Confirm the finished apparatus's applicable safety standard independently because the supplied component data does not establish a finished-product certification.
Recomendado
Bipolar Analog Signal Transmission
ISO122P supports bipolar analog signal transmission when the circuit can operate from the documented ±10 V supplies. This arrangement fits instrumentation that naturally produces positive and negative signals without clipping or shifting them near ground. Fixed unity gain keeps the signal path uncomplicated, while the 50 kHz bandwidth supports low-frequency analog measurements rather than communications waveforms. Component tolerances and practical load impedance determine the usable analog range, so neither input nor output should be assumed to support arbitrary bipolar voltage. The isolated domains still need independent, adequately bypassed supplies and a compliant physical barrier layout.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para ISO122P — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | ISO122U | ISO122 |
|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-pin plastic DIP | Proposed SOIC-16; requires footprint verification | Proposed SOIC-28; requires footprint verification |
Principais diferenciais
- Verified low-cost precision isolation in a through-hole DIP (vs ISO122)
- 50 kHz signal bandwidth is explicitly verified for ISO122P (vs ISO122U)
- Documented single-supply implementation reduces dual-rail complexity (vs AD548KNZ)
Notas de projeto
Keep the isolation barrier as a continuous copper and component keepout, with no test pads, traces, or jumpers bridging the input-side and output-side domains. The 1500 Vrms rating is a component breakdown rating, not permission to reduce creepage or clearance in the finished equipment. Apply the layout and safety-spacing requirements from the manufacturer datasheet and the applicable end-product standard to the actual board, pollution degree, voltage, and working distance.
Provide independent, adequately decoupled supplies on both sides of the barrier and follow the ISO122P single-supply circuit from the manufacturer datasheet when one side operates from a single rail. Verified quiescent currents are approximately 5 mA on VS1 and ±5.5 mA on VS2, but total supply demand also depends on output load and implementation. Confirm capacitor values, voltage tolerance, and startup behavior from the controlled datasheet rather than using generic isolation-amplifier examples.
Treat ISO122P as a 50 kHz-bandwidth precision signal path rather than a general-purpose wideband isolator. Keep input and output traces short, use a low-impedance reference on each isolated domain, and avoid routing near switching nodes, inductors, or high-dv/dt conductors. The 0.020% maximum nonlinearity specification is meaningful only within the stated signal, load, temperature, and power conditions; unintended bandwidth limiting or common-mode coupling can invalidate expected system accuracy.
Do not substitute the ISO122 28-lead surface-mount package for the ISO122P 8-pin DIP solely because both names are similar. The supplied evidence identifies ISO122P as an 8-PDIP device, so a 28-pin replacement requires a different PCB and cannot be a board-level drop-in. Likewise, ISO124P and AD548KNZ were named only in comparison search results without verified matching pinouts or footprints. Production substitution requires manufacturer documentation and bench validation across gain, bandwidth, offset, isolation, and power behavior.
Informações de conformidade
The supplied verified data establishes high-voltage breakdown testing and industrial process-control suitability but does not provide component-level RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declarations. No compliance claim has been inferred.
