AD620 Instrumentation Amplifier

@@ -0,0 +1,67 @@+# AD620++**Analog Devices** · Instrumentation Amplifier · SOIC-8++The AD620 is a low-power, low-noise instrumentation amplifier that sets gain (1 to 1000) with a single external resistor. Its high common-mode rejection, low input bias current, and low noise make it a long-standing choice for amplifying small differential signals from bridge sensors, thermocouples, and biopotential measurements like ECG.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | RG | passive | Gain-setting resistor terminal. Connect an external resistor RG between pins 1 and 8 to program the gain: G = 1 + (49.4 kΩ / RG). Leave open for unity gain (G = 1). |+| 2 | -IN | input | Inverting analog input of the instrumentation amplifier. Differential input impedance 10 GΩ||2 pF; input voltage range within (-Vs + 1.9 V) to (+Vs - 1.2 V) at ±15 V supply. |+| 3 | +IN | input | Noninverting analog input of the instrumentation amplifier. Differential input impedance 10 GΩ||2 pF; input voltage range within (-Vs + 1.9 V) to (+Vs - 1.2 V) at ±15 V supply. |+| 4 | -VS | power_in | Negative supply rail. Operating range ±2.3 V to ±18 V (bipolar) referenced to +VS. Quiescent current 0.9 mA typ, 1.3 mA max. |+| 5 | REF | input | Reference input. Sets the DC level of the output; the output voltage is measured with respect to this pin. Input resistance 20 kΩ typical, input current 50 µA (60 µA max) when VIN+ = VREF = 0. Must be driven from a low-impedance source to preserve CMRR. |+| 6 | OUTPUT | output | Amplifier output. Output voltage = G × (V+IN - V-IN) + VREF. Output swing to within ~1.2 V of the rails at ±15 V into 10 kΩ; short-circuit current ±18 mA. |+| 7 | +VS | power_in | Positive supply rail. Operating range ±2.3 V to ±18 V (bipolar). Quiescent current 0.9 mA typ, 1.3 mA max. |+| 8 | RG | passive | Gain-setting resistor terminal. Connect an external resistor RG between pins 1 and 8 to program the gain: G = 1 + (49.4 kΩ / RG). Leave open for unity gain (G = 1). |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Instrumentation amplifier |+| Gain | 1 to 1000 (single external resistor) |+| Input offset voltage | 50 uV max |+| Input noise | 9 nV/sqrt(Hz) at 1 kHz |+| CMRR | 100 dB min (G >= 10) |+| Supply voltage | +-2.3 V to +-18 V |+| Supply current | 1.3 mA max |+| Operating temperature | -40 C to 85 C |++## Ordering variants++- `AD620AR`+- `AD620ARZ`+- `AD620AR-REEL`+- `AD620ARZ-REEL`+- `AD620AR-REEL7`+- `AD620ARZ-REEL7`+- `AD620BR`+- `AD620BRZ`+- `AD620BR-REEL`+- `AD620BRZ-RL`+- `AD620BR-REEL7`+- `AD620BRZ-R7`+- `AD620AN`+- `AD620ANZ`+- `AD620BN`+- `AD620BNZ`+- `AD620SQ/883B`++## CAD (KiCad official)++- Symbol: `ad620.kicad_sym`+- Footprint: `ad620.kicad_mod`+- 3D model: SOIC-8 body from KiCad `Package_SO/SOIC-8_3.9x4.9mm_P1.27mm`.++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Analog Devices datasheet](https://www.analog.com/media/en/technical-documentation/data-sheets/AD620.pdf) (20 pp, sha256 `83d076a7bf5e92d3`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ad620-datasheet.pdf)

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