S12 – connects VDD_I2C to Analog VDD

S17 – connects BB_VDD to USB3.3V (from USB board)

S19 – connects VDD_D to USB3.3V (from USB board)

S20 – connects VDD_D to SPDIF receiver chip

ANALOG SUPPLY

JP11 — Analog Supply

S12 — connects Analog VDD with Digital VDD (I2C_VDD)

S16 — connects Analog Ground with Digital Ground

S21 — connects Analog VDD to SPDIF receiver chip

INPUTS

Analog Inputs

JP2 — Mono Input

JP6 — Left Input

JP7 — Right Input

Digital Inputs

JP19 — Digital Interface

Pin 1 — MCLK

Pin 2 — I2S_CLK

Pin 3 — I2S_SDI

Pin 4 — I2S_WS

JP20 — Toslink SPDIF Input

JP21 — Coaxial SPDIF Input

Coaxial and Toslink inputs may be toggled between by use of S25. Only one may be used at a time. Must be used in conjunction

with on-board SPDIF receiver chip.

OUTPUTS

JP4 — Right BTL Loudspeaker Output

JP5 — Left BTL Loudspeaker Output

JP1 — Left Headphone Output (Single-Ended or OCL)

JP3 — Right Headphone Output (Single-Ended or OCL)

P1 — Stereo Headphone Jack (Same as JP1, JP2, Single-Ended or OCL)

JP12 — Mono BTL Earpiece Output

JP8 — Single-Ended Line Level Output

CONTROL INTERFACE

X1, X2 – USB Control Bus for I2C/SPI

X1

Pin 9 – Mode Select (SPI or I2C)

X2

Pin 1 – SDA

Pin 3 – SCL

Pin 15 – ADDR/END

Pin 14 – USB5V

Pin 16 – USB3.3V

Pin 16 – USB GND

www.national.com

35