# ADS8166IRHBR

**Texas Instruments** · Analog To Digital Converters (ADC) · VQFN-32-EP(5x5)

ADS8166IRHBR from Texas Instruments, in a VQFN-32-EP(5x5). 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 | GND | power_in | Ground connection; 0V reference potential. |
| 2 | DECAP | power_in | Decoupling capacitor pin; connect 1µF capacitor to GND for internal power supply. |
| 3 | REFIO | bidirectional | External reference voltage input or internal 4.096V reference output; connect 1µF capacitor to GND. |
| 4 | REFM | power_in | Reference ground potential; short externally to GND. |
| 5 | REFP | bidirectional | Reference buffer output and ADC reference input; short pins 5 and 6 together. |
| 6 | REFP | bidirectional | Reference buffer output and ADC reference input; short pins 5 and 6 together. |
| 7 | REFby2 | output | Analog output equal to half the REFP voltage; connect 1µF capacitor to GND. |
| 8 | AIN-COM | input | Common analog input for pseudo-differential or single-ended reference configurations. |
| 9 | AIN0 | input | Analog input channel 0. |
| 10 | AIN1 | input | Analog input channel 1. |
| 11 | AIN2 | input | Analog input channel 2. |
| 12 | AIN3 | input | Analog input channel 3. |
| 13 | AIN4 | input | Analog input channel 4. |
| 14 | AIN5 | input | Analog input channel 5. |
| 15 | AIN6 | input | Analog input channel 6. |
| 16 | AIN7 | input | Analog input channel 7. |
| 17 | ADC-INP | input | Positive ADC analog input. |
| 18 | MUXOUT-P | output | Multiplexer positive analog output. |
| 19 | MUXOUT-M | output | Multiplexer negative analog output. |
| 20 | ADC-INM | input | Negative ADC analog input. |
| 21 | GND | power_in | Ground connection; 0V reference potential. |
| 22 | ALERT | output | Digital alert output, active high; logical OR of enabled channel comparator flags. |
| 23 | CS | input | Chip select input, active low; device starts conversion on CS rising edge, SDO-x go high-impedance when CS high. |
| 24 | SDI | input | Serial data input; transfers commands and configuration data into device via SPI. |
| 25 | SCLK | input | Serial interface clock input; all data transfers synchronized to SCLK edges. |
| 26 | SDO-0 | tri_state | Serial data output 0; high-impedance when CS is high. |
| 27 | SDO-1/SEQSTS | tri_state | Serial data output 1 or sequence status indicator; high-impedance when CS is high. |
| 28 | READY | output | Multifunction output; reflects conversion status when CS high, protocol-dependent output when CS low. |
| 29 | RST | input | Asynchronous reset input, active low; resets device to default register state. |
| 30 | DVDD | power_in | Digital interface power supply; connect 1µF capacitor to GND. |
| 31 | GND | power_in | Ground connection; 0V reference potential. |
| 32 | AVDD | power_in | Analog power supply, 3V to 5.5V range; connect 1µF capacitor to GND. |
| EP | Thermal Pad | power_in | Exposed thermal pad; connect to GND. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-32-EP(5x5) |
| Category | Data Acquisition |
| Pins | 33 |

## Electrical characteristics

Limits as printed in the datasheet (page.json `metadata.characteristics` carries them as data).

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| AVDD supply, internal reference | AVDD | 4.5 | 5 | 5.5 | V | Internal reference | 6 |
| AVDD supply, external reference | AVDD | 3 | 5 | 5.5 | V | External reference | 6 |
| DVDD supply, operating | DVDD | 1.65 | 3 | 5.5 | V | Operating | 6 |
| DVDD supply, specified throughput | DVDD | 2.35 | 3 | 5.5 | V | Specified throughput | 6 |
| Absolute input voltage, AINx to REFM (single-ended) | VIN | -0.1 |  |  | V | AINx to REFM and CHx_CHy_CFG = 00b; max printed as VREF + 0.1 | 6 |
| Absolute input voltage, AINy to REFM | VIN | -0.1 |  | 0.1 | V | AINy to REFM and CHx_CHy_CFG = 01b | 6 |
| Absolute input voltage, AIN-COM (single-ended) | VIN | -0.1 |  | 0.1 | V |  | 6 |
| REFIO input voltage | VREFIO | 2.5 |  |  | V | REFIO configured as input pin; max printed as AVDD - 0.3 | 6 |
| Ambient temperature | TA | -40 | 25 | 125 | °C |  | 6 |
| Input current to any pin except supply pins |  | -10 |  | 10 | mA |  | 5 |
| Junction temperature | TJ | -40 |  | 125 | °C |  | 5 |
| Storage temperature | Tstg | -65 |  | 150 | °C |  | 5 |
| AVDD to GND | AVDD | -0.3 |  | 7 | V |  | 5 |
| DVDD to GND | DVDD | -0.3 |  | 7 | V |  | 5 |
| MUX input on-channel leakage current | ILMUX_ON | -750 | 10 | 750 | nA | REFM < VIN < REFP | 7 |
| Integral nonlinearity | INL | -0.8 | 0.35 | 0.8 | LSB |  | 7 |
| Differential nonlinearity | DNL | -0.5 | 0.2 | 0.5 | LSB |  | 7 |
| Input offset error | VOS | -10 | 0.5 | 10 | LSB |  | 7 |
| Input offset error match |  | -1 | 0.5 | 1 | LSB |  | 7 |
| Gain error | GE | -0.06 | 0.002 | 0.06 | %FSR | Referred to REFIO | 7 |
| Gain error match |  | -0.005 | 0.0025 | 0.005 | %FSR | Referred to REFIO | 7 |
| Gain error thermal drift | dGE/dT | -1 | 1 | 1 | ppm/°C | Referred to REFIO | 7 |
| Signal-to-noise + distortion | SINAD | 91.6 | 93.5 |  | dB | fIN = 2kHz | 7 |
| Signal-to-noise ratio | SNR | 91.8 | 93.6 |  | dB | fIN = 2kHz | 7 |
| Reference buffer offset voltage | VRO | -250 |  | 250 | µV | VRO = VREFP − VREFIO, TA = 25°C | 7 |
| External series resistance (REFP decoupling) | RESR | 0 |  | 1.3 | Ω |  | 7 |
| REFIO output voltage | VREFIO | 4.091 | 4.096 | 4.101 | V | TA = 25°C, REFIO configured as output pin | 7 |
| Internal reference temperature drift | dVREFIO/dT |  | 4 | 18 | ppm/°C |  | 7 |
| REFIO input current | IREFIO |  | 0.1 | 1 | μA | REFIO configured as input pin | 7 |
| Analog supply current, ADS8166 | IAVDD |  | 3 | 4.1 | mA | ADS8166, AVDD = 5V | 8 |
| SCLK high time | tph_CK | 0.45 |  | 0.55 | tCLK |  | 9 |
| SCLK low time | tpl_CK | 0.45 |  | 0.55 | tCLK |  | 9 |
| Time offset: READY falling to next data valid on SDO | toff_STRDO_f | -2 |  | 2 | ns |  | 10 |
| Time offset: READY rising to next data valid on SDO | toff_STRDO_r | -2 |  | 2 | ns |  | 10 |
| Strobe output high time | tph_STR | 0.45 |  | 0.55 | tSTR | 2.35V ≤ DVDD ≤ 5.5V | 10 |
| Strobe output low time | tpl_STR | 0.45 |  | 0.55 | tSTR | 2.35V ≤ DVDD ≤ 5.5V | 10 |
| Junction-to-ambient thermal resistance | RθJA |  | 29.5 |  | °C/W | RHB (VQFN) 32 pins | 5 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 18.6 |  | °C/W | RHB (VQFN) 32 pins | 5 |
| Junction-to-board thermal resistance | RθJB |  | 10.2 |  | °C/W | RHB (VQFN) 32 pins | 5 |
| Junction-to-top characterization parameter | ΨJT |  | 0.2 |  | °C/W | RHB (VQFN) 32 pins | 5 |
| Junction-to-board characterization parameter | ΨJB |  | 10.2 |  | °C/W | RHB (VQFN) 32 pins | 5 |
| Junction-to-case (bottom) thermal resistance | RθJC(bot) |  | 1.3 |  | °C/W | RHB (VQFN) 32 pins | 5 |

## CAD (KiCad official)

- Symbol: `ADS8166IRHBR`
- Footprint: `Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm`
- 3D model: VQFN-32-EP(5x5) (KiCad packages3D, STEP)
- 3D model files: `ads8166irhbr-etched.step` / `ads8166irhbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads8166irhbr.step` / `ads8166irhbr.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ads8166) (86 pp, sha256 `fa97ed7844ff4a62`, retrieved 2026-10-21, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **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/ads8166irhbr-datasheet.pdf)