# AD598JRZ

**Analog Devices** · ADC/DAC - Specialized · SOIC-20-300mil

AD598JRZ from Analog Devices, in a SOIC-20-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | -VS | power_in | Negative supply terminal; the total supply from +VS to -VS is rated to +36 V absolute maximum. |
| 2 | EXC 1 | output | LVDT primary excitation drive output, with excitation voltage range 2.1 V rms to 24 V rms at 2.5 kHz and output current 30 mA rms. |
| 3 | EXC 2 | output | Second LVDT primary excitation drive output, forming the differential sine drive with EXC 1. |
| 4 | LEVEL 1 | passive | Excitation amplitude setting node; the excitation amplitude is programmed by external resistor R1 per the R1 versus VEXC curve. |
| 5 | LEVEL 2 | passive | Second excitation amplitude setting node; used with LEVEL 1 for the R1 connection that sets VEXC. |
| 6 | FREQ 1 | passive | Excitation frequency setting node; the external capacitor C1 sets frequency by C1 = 35 µF·Hz/fEXCITATION. |
| 7 | FREQ 2 | passive | Second excitation frequency setting node; grounded or connected to FREQ 1 to disable the internal oscillator in slave operation. |
| 8 | B1 FILTER | passive | Filter node for the B secondary signal path; system bandwidth is set by the external filter capacitors C2 to C4. |
| 9 | B2 FILTER | passive | Second filter node for the B secondary signal path, used with B1 FILTER for the filter network. |
| 10 | VB | power_in | LVDT secondary input B; the signal input range is 0.1 V rms to 3.5 V rms. |
| 11 | VA | input | LVDT secondary input A; the signal input range is 0.1 V rms to 3.5 V rms. |
| 12 | A2 FILTER | passive | Second filter node for the A secondary signal path, used with A1 FILTER for the filter network. |
| 13 | A1 FILTER | passive | Filter node for the A secondary signal path; system bandwidth is set by the external filter capacitors C2 to C4. |
| 14 | OUTPUT FILTER | passive | Output filter node; the output filter capacitor sets the output ripple and bandwidth. |
| 15 | FEEDBACK | passive | Feedback node for the scale-setting resistor R2, which sets the full-scale output range. |
| 16 | SIGNAL OUTPUT | output | Scaled dc position output, equal to IREF×(A-B)/(A+B)×R2 as stated for the decoder. |
| 17 | SIGNAL REFERENCE | passive | Signal reference node; VOUT is measured with respect to this pin. |
| 18 | OFFSET 2 | passive | Offset adjustment node; offset is set with R3 and R4 per the offset equation, and a potentiometer may connect between pins 18 and 19. |
| 19 | OFFSET 1 | passive | Offset adjustment node paired with OFFSET 2 for the R3 and R4 offset network. |
| 20 | +VS | power_in | Positive supply terminal; operating range is 13 V to 36 V and absolute maximum total supply is +36 V. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices |
| Package | SOIC-20-300mil |
| Category | ADC/DAC/Data Conversion |
| Pins | 20 |

## CAD (KiCad official)

- Symbol: `AD598JRZ`
- Footprint: `Package_SO:SOIC-20W_7.5x12.8mm_P1.27mm`
- 3D model: SOIC-20-300mil (KiCad packages3D, STEP)
- 3D model files: `ad598jrz-etched.step` / `ad598jrz-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ad598jrz.step` / `ad598jrz.glb` are the bare package body.

## 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/AD598.pdf) (16 pp, sha256 `55cc0cd12fa35281`, retrieved 2026-10-30, tier: manufacturer)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ad598jrz-datasheet.pdf)