This article uses the specified datasheet revision. Values are vendor specifications, not ArmSoM measurements; no new hardware validation was performed. Check the actual silicon revision, board schematic, SDK/BSP, kernel and drivers. The explanations and editable tables assist reading; consult the original PDF for the complete specification and bit definitions not expanded here.
RK730 · Rockchip RK730 Datasheet V1.0-20241118.pdf · PDF 7–15.
Original English figure, source PDF p. 11.
Audio capability and scope
RK730 is an external audio Codec with dual ADCs, dual DACs and headphone outputs. Integration depends on I2S/I2C, supplies, clocks and drivers, not only the host SoC. Maximum output power, dynamic range and distortion have different test conditions and are not one combined operating point.
| Item | Specification / source note |
|---|---|
| ADC / DAC | 2 / 2 · 24 bit · 8–192 kHz |
| Output power | 50 mW / 32 Ω; 100 mW / 16 Ω |
| Differential output | 4.8 Vpp at 3.3 V supply |
| Microphone gain | ≤54 dB |
Package dimensions (mm)
| Symbol | Min / Typ / Max or source value |
|---|---|
| Package | QFN28 · 4 × 4 mm · 0.45 mm pitch |
| A | 0.70 / 0.75 / 0.80 |
| A1 | 0 / 0.02 / 0.05 |
| b | 0.15 / 0.20 / 0.25 |
| b1 | 0.14 REF |
| c | 0.18 / 0.20 / 0.25 |
| D / E | 3.90 / 4.00 / 4.10 |
| D2 / E2 | 2.30 / 2.40 / 2.50 |
| e | 0.45 BSC |
| Ne / Nd | 2.70 BSC |
| L | 0.35 / 0.40 / 0.45 |
| h | 0.30 / 0.35 / 0.40 |
Complete pin table
| Number | Name | Source direction | Function |
|---|---|---|---|
| 1 | MCLK | I | Master clock input |
| 2 | DVDD | Supply | Digital supply |
| 3 | PVDD | Supply | Digital I/O supply |
| 4 | DGND | Supply | Digital ground |
| 5 | BCLK | I/O | Bit clock |
| 6 | SDI | I | Audio data input |
| 7 | LRCLK | I/O | Left/right clock |
| 8 | SDO | O | Audio data output |
| 9 | NC | No connection | |
| 10 | VREF | O | Reference voltage |
| 11 | ROUT1 | O | Right output 1 |
| 12 | LOUT1 | O | Left output 1 |
| 13 | HPGND | Supply | Headphone ground |
| 14 | ROUT2 | O | Right output 2 |
| 15 | LOUT2 | O | Left output 2 |
| 16 | HPVDD | Supply | Headphone supply |
| 17 | AVDD | Supply | Analog supply |
| 18 | AGND | Supply | Analog ground |
| 19 | ADCVREF | O | ADC reference |
| 20 | VMID | O | Midpoint reference |
| 21 | MIC2P | I | Microphone 2 positive |
| 22 | MIC2N | I | Microphone 2 negative |
| 23 | MIC1P | I | Microphone 1 positive |
| 24 | MIC1N | I | Microphone 1 negative |
| 25 | MIC_BIAS | O | Microphone bias |
| 26 | CE | I | I2C address selection |
| 27 | SDA | I/O | I2C data |
| 28 | SCL | O | I2C clock; source says O, verify |
| EPAD | EPAD | Supply | Exposed pad to ground |
Supplies and temperature
PVDD powers digital I/O and DVDD powers the digital core; similar names do not justify identical assumptions. HPVDD is recommended at 3.3 V, while the source allows 1.8/3.3 V for the other three rails. Treat reference pins per the vendor circuit, not as general peripheral power outputs.
| Item | Specification / source note |
|---|---|
| PVDD / DVDD / AVDD | Min 1.62 V · Typ 1.8 / 3.3 V · Max 3.6 V |
| HPVDD | Min 3.0 V · Typ 3.3 V · Max 3.6 V |
| Absolute supply/input range | −0.3…3.6 V |
| Source operating-temperature entry | −40…85 °C |
| Storage temperature | −65…150 °C |
Audio test conditions and source discrepancies
ADC dynamic range is 100 dB in the feature list and 101 dB A-weighted in the electrical table. Preserve the latter’s conditions rather than silently merging them. Pin 28 is named SCL with direction O in the table, while the interface description calls it the I2C clock; verify direction against the actual design and current documentation. These quality figures are vendor data, not CM1 or Forge1 measurements.
| Item | Specification / source note |
|---|---|
| ADC | Full scale 1 Vrms; SNR 100 dB; dynamic range 101 dB A-weighted; THD −95 dB typ; input 20 kΩ |
| ADC filter | Passband 0.4917 Fs; stopband 0.5479 Fs; ripple 0.05 dB; attenuation 100 dB |
| DAC normal | 1 Vrms; SNR 98 dB; dynamic range 100 dB; THD −85 dB |
| DAC differential | 2 Vrms; SNR 98 dB; dynamic range 103 dB; THD −88 dB |
Additional source figures
Original English figure, source PDF p. 12.
ArmSoM products and application limits
CM1 and Forge1 are platform references for audio peripheral designs. This article does not claim an onboard RK730 or verified drop-in driver support. First check whether the required I2S, I2C, clocks and voltage levels are exposed.