AMC7832IPAP datasheet(4/74 Pages) TI2

4 / 74 page

AMC7832

SLAS836 – MARCH 2014

www.ti.com

Terminal Functions

TERMINAL

DESCRIPTION

NUMBER

NAME

Digital ground. Ground reference point for all digital circuitry on the device. Ideally, AGND and DGND should be at the

DGND

same potential (GND) and must not differ by more than ±0.3-V.

DVDD

Digital supply voltage. (+4.5-V to +5.5-V). Must be the same value as AVDD.

IOVDD

IO supply voltage. (+1.8-V to +5.5-V). Sets the IO operating voltage and threshold levels. Must not exceed DVDD.

RESET

Reset input, active low. Logic low on this terminal causes the device to perform a hardware reset.

Serial interface data output. The SDO terminal is in high impedance when CS is high. Data is clocked out of the input

SDO

shift register on each falling edge of SCLK.

SDI

Serial interface data input. Data is clocked into the input shift register on each rising edge of SCLK.

SCLK

Serial interface clock.

Active low serial data enable. This input is the frame synchronization signal for the serial data. When this signal goes

low, it enables the input shift register.

General purpose digital I/O 0 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-

GPIO0/ALARMIN

Ω pull-up resistor to IOVDD. Alternatively the terminal can be set to operate as ALARMIN, an alarm control signal,

digital input, active low.

General purpose digital I/O 1 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-

GPIO1/ ALARMOUT

Ω pull-up resistor to IOVDD. Alternatively the terminal can be set to operate as ALARMOUT, a global alarm. Open

drain output. This terminal goes low (active) when an alarm event is detected.

General purpose digital I/O 2 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-

GPIO2/ADCTRIG

Ω pull-up resistor to IOVDD. Alternatively the terminal can be set to operate as ADCTRIG, an external conversion

trigger, active low. The falling edge starts the sampling and conversion of the ADC.

General purpose digital I/O 3 (default). This terminal is a bidirectional open-drain, digital input/output with internal 48-

Ω pull-up resistor to IOVDD. Alternatively the terminal can be set to operate as DAV, Data available indicator, active

GPIO3/DAV

low output. In direct mode, the DAV terminal goes low (active) when the conversion ends. In auto mode, a 1µs pulse

(active low) appears on this terminal when a conversion cycle finishes. DAV stays high when deactivated.

GPIO-4

GPIO-5

General purpose digital I/O. This terminal is a bidirectional open-drain, digital input/output with internal 48-k

Ω pull-up

resistor to IOVDD.

GPIO-6

GPIO-7

Lowest potential in the system. Typically tied to -12-V but if all DACs are set in a positive output range it should be

AVEE

connected to AGND.

DAC_A11,

DAC_A10,

18,19, 22, 24

DAC group A. These channels share the same range and clamp voltage.

DAC_A9,

DAC_A8

Negative analog supply for DAC group A. Sets the power-on-reset and clamp voltage values. Typically tied to AVEE

AVSSA

when the DAC range for group A is set to -10 to 0-V or AGND for the positive output ranges.

This terminal determines the DAC range for DAC group A. If tied to AGND the DAC range is 0 to +5-V or 0 to+10-V.

VRANGEA

Otherwise if tied to +2.5-V (can be tied to REF_OUT terminals) the DAC range is -10 to 0-V.

Analog ground. Ground reference point for all analog circuitry on the device, AGND. Connect AGND1, AGND2 and

AGND1

AGND3 to the same potential, AGND.

AVCC_AB

Positive analog power for DAC groups A and B. Must be tied to AVCC_CD.

This terminal determines the DAC range for DAC group B. If tied to AGND the DAC range is 0 to +5-V or 0 to +10-V.

VRANGEB

Otherwise if tied to +2.5-V (can be tied to REF_OUT terminals) the DAC range is -10 to 0-V.

DAC_B7,

27, 29

DAC group B. These channels share the same range and clamp voltage.

DAC_B6

Negative analog supply for DAC group B. Sets the power-on-reset and clamp voltage values. Typically tied to AVEE

AVSSB

when the DAC range for group B is set to -10 to 0-V or AGND for the positive output ranges.

REF_OUT1

Reference output 1. Can be used to drive the VRANGE inputs.

AVDD1

Analog supply voltage. (+4.5-V to +5.5-V)

REF_CMP

Internal reference compensation capacitor connection (connect 4.7-

μF capacitor between this terminal and AGND2).

Analog ground. Ground reference point for all analog circuitry on the device, AGND. Connect AGND1, AGND2 and

AGND2

AGND3 to the same potential, AGND.

AVDD2

Analog supply voltage. (+4.5-V to +5.5-V)

ADC_11,

ADC_10,

Bipolar analog inputs. Typically used to monitor the DAC_A8 to DAC_A11 outputs. The input range of these channels

35-38

ADC_9,

is -12.5-V to +12.5-V.

ADC_8

ADC_7,

Bipolar analog inputs. Typically used to monitor the DAC_B6 to DAC_B7 outputs. The input range of these channels

39-40

ADC_6

is -12.5-V to +12.5-V.

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