Data Sheet

ADuCM310

Rev. B Page 21 of 27

Pin No.

Mnemonic

Description

J5

DVDD

S

Digital Supply Pin. This pin is the supply for the 16 MHz oscillator, PLL,

POR, and digital core, including the flash that requires a regulated 1.8 V

supply and a 3 V supply.

F9

S

5 V Analog Supply Pin.

L5, H11

AVDD3, AVDD4

S

Analog Supply Pin (3.3 V).

K3

DVDD_REG1

S

Output of 2.5 V on Chip Low Dropout (LDO) Regulator. Connect a 470 nF

capacitor to this pin and DGND. This regulator supplies the inter-die digital

interface.

L3

DVDD_REG2

S

Output of 1.8 V on chip LDO regulator. Connect a 470 nF capacitor to this

pin and DGND. This regulator supplies flash and the Cortex-M3 processor.

F10

AVDD_REG1

S

Output of 2.5 V on chip LDO regulator. Connect a 470 nF capacitor to this

pin and DGND. This regulator supplies the ADC.

G10

AVDD_REG2

S

Output of 2.5 V on chip LDO regulator. Connect a 470 nF capacitor to this

pin and DGND. This regulator supplies the IDACs.

K6

S

−5 V Supply Pin.

E1

IOVDD1

S

3.3 V GPIO Supply Pin.

L2, D10

DGND1, DGND2

S

Digital Ground Pins.

E11, K1

IOVDD2, IOVDD3

S

3.3 V GPIO Supply Pins.

F1, F11,

L1

IOGND1, IOGND2, IOGND3

S

GPIO Ground Pins.

J2

XTALO

DO

Output from the Crystal Oscillator Inverter. If an external crystal is not

used, leave this pin unconnected.

K2

XTALI

DI

Input to the Crystal Oscillator Inverter and Input to the Internal Clock

Generator Circuits. If an external crystal is not used, connect this pin to

the DGND system ground.

J10

BUF_VREF2.5A

AO

Buffered 2.5 V Bias, Maximum Load = 1.2 mA. Connect this pin to AGND

via a 100 nF capacitor.

K11

BUF_VREF2.5B

AO

Buffered 2.5 V Bias, Maximum Load = 1.2 mA. Connect this pin to AGND

via a 100 nF capacitor.

K10, L10

ADC_CAPN

S

Decoupling Capacitor Connection for ADC Reference Buffer. Connect this

pin to AGND.

L11

ADC_CAPP

S

Decoupling Capacitor Connection for ADC Reference Buffer. Connect this

pin to a 4.7 µF capacitor and connect the other side of the capacitor to

the AGND and the ADC_CAPN pins.

A1, A11,

D1, F4,

F8, D6,

H6

RESERVED

Reserved. Do not connect to this pin.

1

I is input, I/O is input/output, AO is analog output, AI is analog input, S is supply, DO is digital output, and DI is digital input.