ADS1299-4PAGR

@@ -0,0 +1,106 @@+# ADS1299-4PAGR++**Texas Instruments** · Analog Front End (AFE) · TQFP-64(10x10)++ADS1299-4PAGR from Texas Instruments, in a TQFP-64(10x10). Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | IN8N | input | Differential analog negative input 8. Not used on ADS1299-4 (channels 5-8 are absent on this variant); tie unused analog inputs directly to AVDD. |+| 2 | IN8P | input | Differential analog positive input 8. Not used on ADS1299-4; tie to AVDD when unused. |+| 3 | IN7N | input | Differential analog negative input 7. Not used on ADS1299-4; tie to AVDD when unused. |+| 4 | IN7P | input | Differential analog positive input 7. Not used on ADS1299-4; tie to AVDD when unused. |+| 5 | IN6N | input | Differential analog negative input 6. Not used on ADS1299-4; tie to AVDD when unused. |+| 6 | IN6P | input | Differential analog positive input 6. Not used on ADS1299-4; tie to AVDD when unused. |+| 7 | IN5N | input | Differential analog negative input 5. Not used on ADS1299-4; tie to AVDD when unused. |+| 8 | IN5P | input | Differential analog positive input 5. Not used on ADS1299-4; tie to AVDD when unused. |+| 9 | IN4N | input | Differential analog negative input for channel 4. Tie unused inputs directly to AVDD. |+| 10 | IN4P | input | Differential analog positive input for channel 4. |+| 11 | IN3N | input | Differential analog negative input for channel 3. |+| 12 | IN3P | input | Differential analog positive input for channel 3. |+| 13 | IN2N | input | Differential analog negative input for channel 2. |+| 14 | IN2P | input | Differential analog positive input for channel 2. |+| 15 | IN1N | input | Differential analog negative input for channel 1. |+| 16 | IN1P | input | Differential analog positive input for channel 1. |+| 17 | SRB1 | bidirectional | Patient stimulus, reference, and bias signal 1. Analog input/output for common-signal routing to reference-montage configurations. |+| 18 | SRB2 | bidirectional | Patient stimulus, reference, and bias signal 2. |+| 19 | AVDD | power_in | Analog supply 4.75-5.25 V. Connect a 1-uF bypass capacitor to AVSS. |+| 20 | AVSS | power_in | Analog ground. |+| 21 | AVDD | power_in | Analog supply 4.75-5.25 V. Connect a 1-uF bypass capacitor to AVSS. |+| 22 | AVDD | power_in | Analog supply 4.75-5.25 V. Connect a 1-uF bypass capacitor to AVSS. |+| 23 | AVSS | power_in | Analog ground. |+| 24 | VREFP | bidirectional | Positive analog reference voltage input/output (4.5 V typ.). Connect a minimum 10-uF capacitor from VREFP to VREFN. |+| 25 | VREFN | input | Negative analog reference voltage input (tied to AVSS typically). |+| 26 | VCAP4 | passive | Analog bypass capacitor pin. Connect a 1-uF capacitor to AVSS. |+| 27 | NC | unconnected | No connection. Leave as open circuit. |+| 28 | VCAP1 | passive | Analog bypass capacitor pin. Connect a 100-uF capacitor to AVSS. |+| 29 | NC | unconnected | No connection. Leave as open circuit. |+| 30 | VCAP2 | passive | Analog bypass capacitor pin. Connect a 1-uF capacitor to AVSS. |+| 31 | RESV1 | input | Reserved for future use. Connect directly to DGND. |+| 32 | AVSS | power_in | Analog ground. |+| 33 | DGND | power_in | Digital ground. |+| 34 | DIN | input | SPI serial data input (MOSI, from host to ADS1299). |+| 35 | PWDN | input | Power-down, active low. Drive low to power down the device. |+| 36 | RESET | input | System reset, active low. |+| 37 | CLK | input | Master clock input. External-clock frequency 1.5-2.25 MHz (2.048 MHz nom.) when CLKSEL=0. |+| 38 | START | input | Synchronization signal to start or restart a conversion. Hold high >=2 tCLK to start; also used to synchronize multiple devices. |+| 39 | CS | input | SPI chip select, active low. |+| 40 | SCLK | input | SPI serial clock input. |+| 41 | DAISY_IN | input | Daisy-chain data input for cascading multiple ADS1299 devices on one SPI bus. |+| 42 | GPIO1 | bidirectional | General-purpose input/output pin 1. Connect to DGND with a >=10-kOhm resistor if unused. |+| 43 | DOUT | output | SPI serial data output (MISO, from ADS1299 to host). |+| 44 | GPIO2 | bidirectional | General-purpose input/output pin 2. Connect to DGND with a >=10-kOhm resistor if unused. |+| 45 | GPIO3 | bidirectional | General-purpose input/output pin 3. Connect to DGND with a >=10-kOhm resistor if unused. |+| 46 | GPIO4 | bidirectional | General-purpose input/output pin 4. Connect to DGND with a >=10-kOhm resistor if unused. |+| 47 | DRDY | output | Data-ready, active low. Falls when a new conversion result is available. |+| 48 | DVDD | power_in | Digital power supply 1.8-3.6 V. Connect a 1-uF bypass capacitor to DGND. |+| 49 | DGND | power_in | Digital ground. |+| 50 | DVDD | power_in | Digital power supply 1.8-3.6 V. Connect a 1-uF bypass capacitor to DGND. |+| 51 | DGND | power_in | Digital ground. |+| 52 | CLKSEL | input | Master clock select: 0 = external CLK, 1 = internal oscillator. Set through a >=10-kOhm resistor to DVDD or DGND. |+| 53 | AVSS1 | power_in | Analog ground for the charge pump / AVDD1 domain. |+| 54 | AVDD1 | power_in | Analog supply (charge-pump domain). Connect a 1-uF capacitor to AVSS1. |+| 55 | VCAP3 | passive | Analog bypass capacitor pin. Connect parallel 1-uF and 0.1-uF capacitors to AVSS. |+| 56 | AVDD | power_in | Analog supply 4.75-5.25 V. Connect a 1-uF bypass capacitor to AVSS. |+| 57 | AVSS | power_in | Analog ground. |+| 58 | AVSS | power_in | Analog ground for the charge pump. |+| 59 | AVDD | power_in | Charge-pump analog supply. Connect a 1-uF capacitor to AVSS (pin 58). |+| 60 | BIASREF | input | Bias-drive non-inverting input (reference voltage for the bias-drive amplifier). |+| 61 | BIASINV | bidirectional | Bias-drive inverting input/output node (for external feedback network of the bias amplifier). |+| 62 | BIASIN | input | Bias-drive input to the input MUX. Routes bias signal to any electrode in case the bias electrode falls off. |+| 63 | BIASOUT | output | Bias-drive output. Provides patient-bias current derived from selected channels. |+| 64 | RESERVED | unconnected | Reserved for future use. Leave as open circuit. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Texas Instruments |+| Package | TQFP-64(10x10) |+| Category | Data Acquisition |+| Pins | 64 |++## Ordering variants++Same part, different packaging or reel option.++- `ADS1299-4PAGR`++## CAD (KiCad official)++- Symbol: `ADS1299-4PAGR`+- Footprint: `Package_QFP:TQFP-64_10x10mm_P0.5mm`+- 3D model: TQFP-64(10x10) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/cn/lit/gpn/ads1299-4) (84 pp, sha256 `459b96d289166ad4`, retrieved 2026-08-17, 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/ads1299-4pagr-datasheet.pdf)