component
DAC8734SRHAR
Public Made by Adomby adom
Texas Instruments Digital To Analog Converters (DACs), VQFN-40-EP(6x6). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownDAC8734SRHAR
Texas Instruments · Digital To Analog Converters (DACs) · VQFN-40-EP(6x6)
DAC8734SRHAR from Texas Instruments, in a VQFN-40-EP(6x6). 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 | CS | input | SPI chip select input (active low); data not clocked into shift register unless CS is low. |
| 2 | SCLK | input | SPI bus clock; data latched on falling edge of SCLK while CS is low, supports up to 50MHz. |
| 3 | SDI | input | SPI bus input data; 24-bit word loaded MSB first under SCLK control. |
| 4 | SDO | tri_state | SPI data output (tri-state); high-impedance when CS is high, can daisy-chain to next device SDI. |
| 5 | LDAC | input | Load DAC latch control input (active low); transfers Input Data Register to DAC latch and updates outputs. |
| 6 | RST | input | Reset input (active low); resets input registers and DACs to values defined by UNI/BIP pins. |
| 7 | GPIO-0 | bidirectional | General-purpose bidirectional digital I/O with open-drain output; requires 10kΩ pull-up resistor to IOVDD when used as output. |
| 8 | GPIO-1 | bidirectional | General-purpose bidirectional digital I/O with open-drain output; requires 10kΩ pull-up resistor to IOVDD when used as output. |
| 9 | UNI/BIP-A | input | Output mode selection for group A (DAC-0, DAC-1); tie to IOVDD for unipolar mode (0V to +20V) or DGND for bipolar mode (±10V). |
| 10 | DGND | power_in | Digital ground; return path for digital circuits. |
| 11 | IOVDD | power_in | Interface logic power supply; 1.8V to DVDD, supports 1.8V/3V/5V logic levels. |
| 12 | DVDD | power_in | Digital power supply; 2.7V to 5.5V, powers digital circuits and SPI interface. |
| 13 | VOUT-0 | output | DAC-0 analog output voltage; output range ±15V bipolar or 0V to +20V unipolar with 16-bit resolution. |
| 14 | RFB2-0 | output | DAC-0 RFB2 feedback resistor pin; connect to VOUT-0 with RFB1-0 for gain=2, leave open for gain=4. |
| 15 | RFB1-0 | output | DAC-0 RFB1 feedback resistor pin; connect to VOUT-0 for gain=2 or gain=4 configurations. |
| 16 | SGND-0 | power_in | DAC-0 signal ground; connect to REFGND-A with very low impedance trace for optimal linearity. |
| 17 | SGND-1 | power_in | DAC-1 signal ground; connect to REFGND-A with very low impedance trace for optimal linearity. |
| 18 | RFB1-1 | output | DAC-1 RFB1 feedback resistor pin; connect to VOUT-1 for gain=2 or gain=4 configurations. |
| 19 | RFB2-1 | output | DAC-1 RFB2 feedback resistor pin; connect to VOUT-1 with RFB1-1 for gain=2, leave open for gain=4. |
| 20 | VOUT-1 | output | DAC-1 analog output voltage; output range ±15V bipolar or 0V to +20V unipolar with 16-bit resolution. |
| 21 | AVDD | power_in | Positive analog power supply; 4.75V to 24V, powers analog reference buffers and output stages. |
| 22 | AGND | power_in | Analog ground; power ground for DAC, must connect to REFGND-A and REFGND-B. |
| 23 | AVSS | power_in | Negative analog power supply; -18V to -4.75V, provides return path for analog power. |
| 24 | REFGND-A | power_in | Reference ground for REF-A; connect to AGND and SGND-0/SGND-1 with very low impedance traces. |
| 25 | REF-A | input | Reference input for group A (DAC-0, DAC-1); typically +5V, sets output span for group A channels. |
| 26 | REF-B | input | Reference input for group B (DAC-2, DAC-3); typically +5V, sets output span for group B channels. |
| 27 | REFGND-B | power_in | Reference ground for REF-B; connect to AGND and SGND-2/SGND-3 with very low impedance traces. |
| 28 | AVSS | power_in | Negative analog power supply; -18V to -4.75V, provides return path for analog power. |
| 29 | VMON | output | Analog monitor output (high-impedance when disabled); multiplexes one of four DAC outputs or AIN via Monitor Register. |
| 30 | AVDD | power_in | Positive analog power supply; 4.75V to 24V, powers analog reference buffers and output stages. |
| 31 | VOUT-3 | output | DAC-3 analog output voltage; output range ±15V bipolar or 0V to +20V unipolar with 16-bit resolution. |
| 32 | RFB2-3 | output | DAC-3 RFB2 feedback resistor pin; connect to VOUT-3 with RFB1-3 for gain=2, leave open for gain=4. |
| 33 | RFB1-3 | output | DAC-3 RFB1 feedback resistor pin; connect to VOUT-3 for gain=2 or gain=4 configurations. |
| 34 | SGND-3 | power_in | DAC-3 signal ground; connect to REFGND-B with very low impedance trace for optimal linearity. |
| 35 | SGND-2 | power_in | DAC-2 signal ground; connect to REFGND-B with very low impedance trace for optimal linearity. |
| 36 | RFB1-2 | output | DAC-2 RFB1 feedback resistor pin; connect to VOUT-2 for gain=2 or gain=4 configurations. |
| 37 | RFB2-2 | output | DAC-2 RFB2 feedback resistor pin; connect to VOUT-2 with RFB1-2 for gain=2, leave open for gain=4. |
| 38 | VOUT-2 | output | DAC-2 analog output voltage; output range ±15V bipolar or 0V to +20V unipolar with 16-bit resolution. |
| 39 | AIN | input | Auxiliary analog input; routed to analog monitor multiplexer (VMON), accepts AVSS-0.3V to AVDD+0.3V. |
| 40 | UNI/BIP-B | input | Output mode selection for group B (DAC-2, DAC-3); tie to IOVDD for unipolar mode (0V to +20V) or DGND for bipolar mode (±10V). |
| 41 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | VQFN-40-EP(6x6) |
| Category | ADC/DAC/Data Conversion |
| Pins | 41 |
CAD (KiCad official)
- Symbol:
DAC8734SRHAR - Footprint:
Package_DFN_QFN:QFN-40-1EP_6x6mm_P0.5mm_EP4.6x4.6mm - 3D model: VQFN-40-EP(6x6) (KiCad packages3D, STEP)
- 3D model files:
dac8734srhar-etched.step/dac8734srhar-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);dac8734srhar.step/dac8734srhar.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (51 pp, sha256
6fd4329aabd41484, retrieved 2026-10-07, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(text), consensusclaude-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).