AMC7891 datasheet(3/43 Pages) TI2

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AMC7891

www.ti.com

SBAS518A

– AUGUST 2011 – REVISED DECEMBER 2011

AMC7891 Pin Functions (continued)

I/O

DESCRIPTION

NO.

NAME

DACOUT2

DAC2 buffered output. (0 V to AVDD).

Can source/sink up to 10 mA.

DACOUT1

DAC1 buffered output. (0 V to AVDD).

Can source/sink up to 10 mA.

DACOUT0

DAC0 buffered output. (0 V to AVDD).

Can source/sink up to 10 mA.

AGND2

Analog ground. Ground reference point for all analog circuitry on the device, AGND. Connect AGND1 and

AGND2 to the same potential, AGND.

GPIOC3

I/O

General purpose digital I/O C3. Maximum voltage is set by GPIOVDD

GPIOC2

I/O

General purpose digital I/O C2. Maximum voltage is set by GPIOVDD

GPIOC1

I/O

General purpose digital I/O C1. Maximum voltage is set by GPIOVDD

GPIOC0

I/O

General purpose digital I/O C0. Maximum voltage is set by GPIOVDD

DAV

ADC data available indicator. Open-drain, active low output.

In direct-mode, DAV goes low when an ADC conversion cycle finishes. In auto-mode a 1

µs pulse appears

on this pin when the conversion cycle finishes (see ADC Operation for details). DAV stays high when

deactivated. If used, an external 10 k

Ω pull-up resistor to GPIOVDD is required. If unused, the pin can be

connected to DGND.

GPIOB3

I/O

General purpose digital I/O B3. Maximum voltage is set by GPIOVDD

GPIOB2

I/O

General purpose digital I/O B2. Maximum voltage is set by GPIOVDD

GPIOB1

I/O

General purpose digital I/O B1. Maximum voltage is set by GPIOVDD

GPIOB0

I/O

General purpose digital I/O B1. Maximum voltage is set by GPIOVDD

GPIOA3

I/O

General purpose digital I/O A3. Maximum voltage is set by GPIOVDD

GPIOA2

I/O

General purpose digital I/O A2. Maximum voltage is set by GPIOVDD

GPIOA1

I/O

General purpose digital I/O A1. Maximum voltage is set by GPIOVDD

GPIOA0

I/O

General purpose digital I/O A1. Maximum voltage is set by GPIOVDD

AIN0

Uncommitted analog input 0. (0 V to 5 V)

AIN1

Uncommitted analog input 1. (0 V to 5 V)

AIN2

Uncommitted analog input 2. (0 V to 5 V)

AIN3

Uncommitted analog input 3. (0 V to 5 V)

AIN4

Uncommitted analog input 4. (0 V to 5 V)

AIN5

Uncommitted analog input 5. (0 V to 5 V)

AIN6

Uncommitted analog input 6. (0 V to 5 V)

AIN7

Uncommitted analog input 7. (0 V to 5 V)

REF

I/O

Used as external ADC reference input when the internal reference buffer is disabled in register AMC_power,

ref_on =

‘0’ (default). A decoupling capacitor is recommended between the external reference output an

AGND for noise filtering.

Used as internal reference output when the internal reference buffer is enabled in register AMC_power,

ref_on =

‘1’. Requires a 4.7 µF decoupling capacitor to AGND when used as reference output. An external

buffer amplifier with high impedance input is required to drive an external load.

–

THERMAL

–

The thermal pad is located on the package underside. Connect to the board ground plane using multiple

vias.

PAD

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