# ADS7957SRHBR

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

ADS7957SRHBR 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 | AGND | power_in | Analog ground. |
| 2 | MXO | output | Multiplexer output. |
| 3 | AINP | input | ADC input signal. |
| 4 | AINM | input | ADC input ground. |
| 5 | CH15 | input | Analog-input channel 15 for the multiplexer. |
| 6 | CH14 | input | Analog-input channel 14 for the multiplexer. |
| 7 | CH13 | input | Analog-input channel 13 for the multiplexer. |
| 8 | CH12 | input | Analog-input channel 12 for the multiplexer. |
| 9 | CH11 | input | Analog-input channel 11 for the multiplexer. |
| 10 | CH10 | input | Analog-input channel 10 for the multiplexer. |
| 11 | CH9 | input | Analog-input channel 9 for the multiplexer. |
| 12 | CH8 | input | Analog-input channel 8 for the multiplexer. |
| 13 | CH7 | input | Analog-input channel 7 for the multiplexer. |
| 14 | CH6 | input | Analog-input channel 6 for the multiplexer. |
| 15 | CH5 | input | Analog-input channel 5 for the multiplexer. |
| 16 | CH4 | input | Analog-input channel 4 for the multiplexer. |
| 17 | CH3 | input | Analog-input channel 3 for the multiplexer. |
| 18 | CH2 | input | Analog-input channel 2 for the multiplexer. |
| 19 | CH1 | input | Analog-input channel 1 for the multiplexer. |
| 20 | CH0 | input | Analog-input channel 0 for the multiplexer (default channel after power-up or reset). |
| 21 | +VA | power_in | Analog power supply, 2.7 V to 5.25 V recommended operating range. |
| 22 | AGND | power_in | Analog ground. |
| 23 | CS | input | Chip-select input, active low. |
| 24 | SCLK | input | Serial clock input, up to 20 MHz. |
| 25 | SDI | input | Serial data input. |
| 26 | SDO | output | Serial data output. |
| 27 | BDGND | power_in | Digital ground. |
| 28 | +VBD | power_in | Digital I/O supply, 1.7 V to +VA recommended operating range. |
| 29 | GPIO0 | bidirectional | Programmable general-purpose input or output that can alternatively serve as an active-high alarm output. |
| 30 | REFM | input | Reference ground. |
| 31 | REFP | input | Reference input; 2.5 V reference with a 10 µF ceramic decoupling capacitor to REFM. |
| 32 | +VA | power_in | Analog power supply, 2.7 V to 5.25 V recommended operating range. |
| 33 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-32-EP(5x5) |
| Category | ADC/DAC/Data Conversion |
| 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 |
|---|---|---|---|---|---|---|---|
| AINP or CHn to AGND |  | -0.3 |  |  | V |  | 10 |
| +VA to AGND, +VBD to BDGND |  | -0.3 |  | 7 | V |  | 10 |
| Digital input voltage to BDGND |  | -0.3 |  | 7 | V |  | 10 |
| Digital output to BDGND |  | -0.3 |  |  | V |  | 10 |
| Input current to any pin except supply pins |  | -10 |  | 10 | mA |  | 10 |
| Operating temperature |  | -40 |  | 125 | °C |  | 10 |
| Junction temperature (TJ Max) | TJ |  |  | 150 | °C |  | 10 |
| Storage temperature (Tstg) | Tstg | -65 |  | 150 | °C |  | 10 |
| Analog power-supply voltage | V(+VA) | 2.7 | 3.3 | 5.25 | V |  | 10 |
| Digital I/O-supply voltage | V(+VBD) | 1.7 | 3.3 |  | V |  | 10 |
| Reference voltage | V(REF) | 2 | 2.5 | 3 | V |  | 10 |
| SCLK frequency | ƒ(SCLK) |  |  | 20 | MHz |  | 10 |
| Operating temperature range | TA | -40 |  | 125 | °C |  | 10 |
| Full-scale input span, Range 1 |  | 0 |  |  | V | Range 1 | 14 |
| Full-scale input span, Range 2 |  | 0 |  |  | V | while 2xVREF ≤ +VA | 14 |
| Absolute input range, Range 1 |  | -0.2 |  |  | V | Range 1 | 14 |
| Absolute input range, Range 2 |  | -0.2 |  |  | V | while 2xVREF ≤ +VA | 14 |
| Integral linearity |  | -0.5 | 0.2 | 0.5 | LSB |  | 14 |
| Differential linearity |  | -0.5 | 0.2 | 0.5 | LSB |  | 14 |
| Offset error |  | -1.5 | 0.5 | 1.5 | LSB | Measured relative to an ideal full-scale input | 14 |
| Gain error, Range 1 |  | -1 | 0.1 | 1 | LSB | Range 1 | 14 |
| Alarm high threshold range |  | 0 |  | 4092 | LSB |  | 14 |
| Alarm low threshold range |  | 0 |  | 4092 | LSB |  | 14 |
| Logic low input voltage | VIL |  |  | 0.8 | V | +VBD = 5 V | 15 |
| Logic low input voltage | VIL |  |  | 0.4 | V | +VBD = 3 V | 15 |
| Low-level output voltage | VOL |  |  | 0.4 | V | At Isink = 200 μA | 15 |
| Analog power-supply voltage | +VA | 2.7 | 3.3 | 5.25 | V |  | 15 |
| Digital I/O supply voltage | +VBD | 1.7 | 3.3 | 5.25 | V |  | 15 |
| Supply current (normal mode), static state |  |  | 1.05 | 1 | mA | At +VA = 2.7 to 3.6 V static state | 15 |
| Supply current (normal mode), 1 MHz throughput |  |  | 2.3 | 3 | mA | At +VA = 4.7 to 5.25 V and 1 MHz throughput | 15 |
| Supply current (normal mode), static state |  |  | 1.1 | 1.5 | mA | At +VA = 4.7 to 5.25 V static state | 15 |
| Junction-to-ambient thermal resistance | RθJA |  | 40.6 |  | °C/W |  | 11 |
| Junction-to-case (top) thermal resistance | RθJC(top) |  | 32.1 |  | °C/W |  | 11 |
| Junction-to-board thermal resistance | RθJB |  | 13.1 |  | °C/W |  | 11 |
| Junction-to-top characterization parameter | ψJT |  | 0.8 |  | °C/W |  | 11 |
| Junction-to-board characterization parameter | ψJB |  | 13 |  | °C/W |  | 11 |
| Junction-to-case (bottom) thermal resistance | RθJC(bot) |  | 5.7 |  | °C/W |  | 11 |

## Materials and finish

As the datasheet states them (page.json `metadata.appearance`; the 3D model's colours follow it).

| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper |  | • A copper fill area underneath the device ties the AGND, BDGND, AINM, and REFM pins together. This | 52 |

## CAD (KiCad official)

- Symbol: `ADS7957SRHBR`
- 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: `ads7957srhbr-etched.step` / `ads7957srhbr-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ads7957srhbr.step` / `ads7957srhbr.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/lit/ds/symlink/ads7957srhbr.pdf) (80 pp, sha256 `89c0b3de229df440`, retrieved 2026-10-28, tier: manufacturer)
- **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:** 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/ads7957srhbr-datasheet.pdf)