MCP3208

@@ -0,0 +1,60 @@+# MCP3208++**Microchip Technology** · 8-channel 12-bit SPI ADC · SOIC-16++An 8-channel 12-bit SPI analog-to-digital converter in SOIC-16, the higher-resolution sibling of the MCP3008. Same pinout and interface, but 12 bits (4096 counts) instead of 10 for four times the resolution, sampling up to 100 k samples per second. The eight inputs read as eight single-ended channels or four pseudo-differential pairs against an external VREF, with separate analog and digital grounds for clean conversions. The four-wire SPI makes it a drop-in analog front end for any microcontroller, including the Raspberry Pi. Runs 2.7-5.5 V.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | CH0 | input | Analog input channel 0. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH1. Input range VSS to VREF in single-ended mode. |+| 2 | CH1 | input | Analog input channel 1. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH0. |+| 3 | CH2 | input | Analog input channel 2. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH3. |+| 4 | CH3 | input | Analog input channel 3. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH2. |+| 5 | CH4 | input | Analog input channel 4. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH5. |+| 6 | CH5 | input | Analog input channel 5. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH4. |+| 7 | CH6 | input | Analog input channel 6. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH7. |+| 8 | CH7 | input | Analog input channel 7. Configurable as single-ended input or as IN+/IN- of a pseudo-differential pair with CH6. |+| 9 | DGND | power_in | Digital ground return for internal digital circuitry. Connect to the system ground plane; keep separate return path from AGND where possible. |+| 10 | CS/SHDN | input | Active-low chip select / shutdown input. Falling edge initiates SPI communication and starts a conversion; driving high ends the conversion and places the device in low-power standby (IDDS ~0.5 uA typ). Must be pulled high between conversions. |+| 11 | DIN | input | SPI serial data input (MOSI). Used to load the start bit, single/differential select, and channel configuration bits into the device. Data is latched on the rising edge of CLK. |+| 12 | DOUT | output | SPI serial data output (MISO). Shifts out the 12-bit conversion result MSB first as the conversion takes place; data changes on the falling edge of CLK. High-impedance when CS is high. |+| 13 | CLK | input | SPI serial clock input. Initiates conversion and clocks each bit of the conversion out on DOUT. fCLK max 2.0 MHz at VDD=5V, 1.0 MHz at VDD=2.7V; effective clock rates below 10 kHz can affect linearity due to sample-cap charge loss. |+| 14 | AGND | power_in | Analog ground return for internal analog circuitry. Connect to the analog ground plane and tie to DGND at a single star point to minimise digital noise coupling into conversions. |+| 15 | VREF | input | External reference voltage input. Sets the analog input full-scale range. Valid range 0.25 V to VDD; typical current drain 100 uA (150 uA max). Reference noise/instability directly affects conversion accuracy. |+| 16 | VDD | power_in | Positive supply voltage, +2.7 V to +5.5 V. Typical operating current 320 uA at 5V (400 uA max, DOUT unloaded); bypass locally with a 0.1 uF ceramic to DGND/AGND. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | 8-channel SAR ADC |+| Resolution | 12-bit |+| Sample rate | 100 ksps (at 5 V) |+| Inputs | 8 single-ended or 4 pseudo-differential |+| Interface | SPI (up to 2 MHz) |+| Reference | external VREF pin |+| Supply voltage | 2.7-5.5 V |+| Package | SOIC-16 |++## Ordering variants++- `MCP3208-CI/SL (SOIC-16)`+- `MCP3208-CI/P (PDIP-16)`++## CAD (KiCad official)++- Symbol: `Analog_ADC:MCP3208`+- Footprint: `Package_SO:SOIC-16_3.9x9.9mm_P1.27mm`+- 3D model: SOIC-16 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Microchip Technology datasheet](https://ww1.microchip.com/downloads/en/DeviceDoc/21298e.pdf) (40 pp, sha256 `89bc1e17c35e2bb1`, 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/mcp3208-datasheet.pdf)

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