COSINE Tier-1 distributor Jarwey｜Motor feedback op amps: Hall, bridge, and shunt
Jarwey is a COSINE Tier-1 distributor and can support selection, datasheets, samples, small lots, and lead time.
A servo or industrial drive rarely has one “feedback op amp.” Hall or encoder buffers, millivolt bridge position, and shunt current land on the same board with different common-mode, offset, and gain problems. Split those three jobs before opening a part page.
Datasheets: contact Jarwey. This note is a routing table. Gain ladders for shunt monitors, the 36V zero-drift family, the COS4177SR servo current note, and the COS620 instrumentation comparison already exist—do not treat the rows below as a second copy of those tables.
Motor feedback: which front end first
| Job | Signal | Start with | Part | Boundary already published | Page |
|---|---|---|---|---|---|
| Hall / single-ended position buffer | Low-voltage swing that must reach the ADC rails | General-purpose RRIO dual | COS6002SR | SOIC-8; MCP6002 evaluation path | 886 |
| Bridge / position differential | Millivolt differential plus ground shift | Instrumentation amplifier | COS620BRZ | SOP-8; INA129 / AD620 path; page lists motor position feedback | 864 |
| Shunt into a 5V ADC | Sense-resistor drop, fixed gain | Current-sense amplifier | COSINA180A2 | 50 V/V; VCM −0.3 to 25 V; VCC 2.7 to 5.5 V | 962 |
| Higher bus, drift-limited DC | Low-frequency current where offset drift sets the error | 36V zero-drift op amp | COS2180SRA | 36V zero-drift; 2 MHz GBP; SOP-8 | 929 |
| Multi-channel servo conditioning | Low-side or high-side current plus several loop-conditioning channels | High-voltage precision op amp | COS4177SR | SOP-14; page positions it for motor-drive and servo signal conditioning | 866 |
Bus-voltage monitoring is a supply-sense job, not one of the three feedback chains. Use a divider and a reference. Do not ask an op amp to be the reference.
INA129, AD620, INA180, MCP6002, and OPA4277 are anchors for evaluation only. Same package is not a drop-in. Check the datasheet and measure the board.
Checklist before you pick
- Name the job: Hall or encoder buffer, bridge position, or shunt current. One chain, one device class.
- Hall already inside the ADC span? Buffer and anti-alias with COS6002SR. Do not build a millivolt bridge diff-amp out of it.
- Position bridge: set gain and REF from the COS620BRZ datasheet and keep common-mode inside the supply.
- 5V-side shunt: if common-mode stays inside −0.3 to 25 V and supply stays within 5.5 V, use COSINA180A2 at 50 V/V. Full scale is shunt voltage times 50—confirm it does not clip.
- Higher bus or drift-dominated error: open COS2180SRA (36V zero-drift, 2 MHz GBP). Do not hang a 5V zero-drift part on the high bus.
- Several high-voltage conditioning channels: open COS4177SR. If the error budget is thermal drift, move to COS2180SRA. Do not merge them into one family table.
- Samples: request the datasheet, samples, and a small lot from Jarwey. Measure offset, common-mode margin, gain error, and temperature rise before the production order.
Pages and contact
- COS6002SR RRIO dual
- COS620BRZ instrumentation amplifier
- COSINA180A2 current sense
- COS2180SRA 36V zero-drift
- COS4177SR precision op amp
Selection support, samples, and lead time: Jarwey · COSINE Tier-1 distributor · kerry.w@jarwey.cn · Contact.
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