# DAC8734SPFB

**Texas Instruments** · Digital To Analog Converters (DAC) · TQFP-48(7x7)

DAC8734SPFB from Texas Instruments, in a TQFP-48(7x7). 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 | NC | unconnected | Not connected. |
| 2 | CS | input | SPI bus chip select input, active low; data are clocked into the shift register only while CS is low, and SDO is high-impedance when CS is high. |
| 3 | SCLK | input | SPI bus clock input, operating at up to 50 MHz; data are latched on SCLK falling edges while CS is low. |
| 4 | SDI | input | SPI bus serial data input, latched on SCLK falling edges while CS is low and ignored when CS is high. |
| 5 | SDO | output | SPI serial data output used for daisy-chaining; it is enabled only after the DSDO bit in the Command Register is cleared and is high-impedance when CS is high. |
| 6 | LDAC | input | Active-low asynchronous load input that transfers the input data register contents to the DAC latch, making the latch transparent while low. |
| 7 | RST | input | Active-low reset input that resets the input registers and DACs to the UNI/BIP-defined values (outputs at 0V) and sets the gain and zero registers to default values. |
| 8 | GPIO-0 | bidirectional | General-purpose digital I/O with open-drain output; a 10kΩ pull-up to IOVDD is required when used as an output. |
| 9 | GPIO-1 | bidirectional | General-purpose digital I/O with open-drain output; a 10kΩ pull-up to IOVDD is required when used as an output. |
| 10 | UNI/BIP-A | input | Output mode select for group A (DAC-0 and DAC-1): tied to IOVDD for unipolar straight-binary output, tied to DGND for bipolar twos-complement output. |
| 11 | DGND | power_in | Digital ground and return path for digital currents. |
| 12 | NC | unconnected | Not connected. |
| 13 | IOVDD | power_in | Interface power supply, specified from +1.8V up to DVDD in the electrical characteristics. |
| 14 | DVDD | power_in | Digital power supply, nominally 5V (±10% in the electrical characteristics); absolute maximum DVDD to DGND is 6V. |
| 15 | VOUT-0 | output | DAC-0 analog output; the output must stay between AVSS + 1.0V and AVDD − 1.0V to avoid saturation. |
| 16 | RFB2-0 | output | DAC-0 RFB2 feedback connection: tie to VOUT-0 for gain = 2, leave open for gain = 4. |
| 17 | RFB1-0 | output | DAC-0 RFB1 feedback connection, tied to VOUT-0 in both gain configurations. |
| 18 | SGND-0 | power_in | DAC-0 signal ground, which must be connected to REFGND-A with a very low-resistance path. |
| 19 | NC | unconnected | Not connected. |
| 20 | SGND-1 | power_in | DAC-1 signal ground, which must be connected to REFGND-A with a very low-resistance path. |
| 21 | RFB1-1 | output | DAC-1 RFB1 feedback connection, tied to VOUT-1 in both gain configurations. |
| 22 | RFB2-1 | output | DAC-1 RFB2 feedback connection: tie to VOUT-1 for gain = 2, leave open for gain = 4. |
| 23 | VOUT-1 | output | DAC-1 analog output; the output must stay between AVSS + 1.0V and AVDD − 1.0V to avoid saturation. |
| 24 | NC | unconnected | Not connected. |
| 25 | NC | unconnected | Not connected. |
| 26 | AVDD | power_in | Positive analog power supply; AVDD must be between 4.75V and 24V, with AVDD − AVSS ≤ 36V. |
| 27 | AGND | power_in | Analog power ground for the DAC, which must be connected to REFGND-A and REFGND-B and to DGND at a single star point. |
| 28 | AVSS | power_in | Negative analog power supply; AVSS must be no greater than −4.75V and no less than −18V. |
| 29 | REFGND-A | power_in | Reference ground for REF-A, which must be connected to AGND. |
| 30 | REF-A | input | Group A (DAC-0, DAC-1) reference input; it should be applied after AVDD comes up to avoid turning on ESD circuitry. |
| 31 | REF-B | input | Group B (DAC-2, DAC-3) reference input; it should be applied after AVDD comes up to avoid turning on ESD circuitry. |
| 32 | REFGND-B | power_in | Reference ground for REF-B, which must be connected to AGND. |
| 33 | AVSS | power_in | Negative analog power supply; AVSS must be no greater than −4.75V and no less than −18V. |
| 34 | VMON | output | Analog monitor output that routes one DAC output or AIN, or is high-impedance when disabled; its output impedance is about 2.2kΩ, so it should be measured with a high-impedance input. |
| 35 | AVDD | power_in | Positive analog power supply; AVDD must be between 4.75V and 24V, with AVDD − AVSS ≤ 36V. |
| 36 | NC | unconnected | Not connected. |
| 37 | NC | unconnected | Not connected. |
| 38 | VOUT-3 | output | DAC-3 analog output; the output must stay between AVSS + 1.0V and AVDD − 1.0V to avoid saturation. |
| 39 | RFB2-3 | output | DAC-3 RFB2 feedback connection: tie to VOUT-3 for gain = 2, leave open for gain = 4. |
| 40 | RFB1-3 | output | DAC-3 RFB1 feedback connection, tied to VOUT-3 in both gain configurations. |
| 41 | SGND-3 | power_in | DAC-3 signal ground, which must be connected to REFGND-B with a very low-resistance path. |
| 42 | NC | unconnected | Not connected. |
| 43 | SGND-2 | power_in | DAC-2 signal ground, which must be connected to REFGND-B with a very low-resistance path. |
| 44 | RFB1-2 | output | DAC-2 RFB1 feedback connection, tied to VOUT-2 in both gain configurations. |
| 45 | RFB2-2 | output | DAC-2 RFB2 feedback connection: tie to VOUT-2 for gain = 2, leave open for gain = 4. |
| 46 | VOUT-2 | output | DAC-2 analog output; the output must stay between AVSS + 1.0V and AVDD − 1.0V to avoid saturation. |
| 47 | AIN | input | Auxiliary analog input connected to the analog monitor multiplexer; absolute range is AVSS − 0.3V to AVDD + 0.3V. |
| 48 | UNI/BIP-B | input | Output mode select for group B (DAC-2 and DAC-3): tied to IOVDD for unipolar straight-binary output, tied to DGND for bipolar twos-complement output. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | TQFP-48(7x7) |
| Category | Data Acquisition |
| Pins | 48 |

## CAD (KiCad official)

- Symbol: `DAC8734SPFB`
- Footprint: `Package_QFP:TQFP-48_7x7mm_P0.5mm`
- 3D model: TQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `dac8734spfb-etched.step` / `dac8734spfb-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `dac8734spfb.step` / `dac8734spfb.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/dac8734) (51 pp, sha256 `6fd4329aabd41484`, retrieved 2026-10-08, tier: lcsc)
- **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/dac8734spfb-datasheet.pdf)