ADC 6 Spécifications télécharger pdf (Page 14)

GND

50 k:

GND

ADC12D1800RF

SNAS518I –JULY 2011–REVISED JANUARY 2014

www.ti.com

Table 2-2. Control and Status Balls (continued)

Ball No. Name Equivalent Circuit Description

Calibration cycle initiate. The user can command

the device to execute a self-calibration cycle by

holding this input high a minimum of t

CAL_H

after

having held it low a minimum of t

CAL_L

. If this input

is held high at the time of power-on, the automatic

power-on calibration cycle is inhibited until this

D6 CAL

input is cycled low-then-high. This pin is active in

both ECM and Non-ECM. In ECM, this pin is

logically OR'd with the CAL Bit (Addr: 0h, Bit 15)

in the Control Register. Therefore, both pin and bit

must be set low and then either can be set high to

execute an on-command calibration.

Calibration Running indication. This output is

B5 CalRun logic-high while the calibration sequence is

executing. This output is logic-low otherwise.

Power Down I- and Q-channel. Setting either input

to logic-high powers down the respective I- or Q-

channel. Setting either input to logic-low brings the

respective I- or Q-channel to an operational state

U3 PDI after a finite time delay. This pin is active in both

V3 PDQ ECM and Non-ECM. In ECM, each Pin is logically

OR'd with its respective Bit. Therefore, either this

pin or the PDI and PDQ Bit in the Control Register

can be used to power-down the I- and Q-channel

(Addr: 0h, Bit 11 and Bit 10), respectively.

Test Pattern Mode select. With this input at logic-

high, the device continuously outputs a fixed,

repetitive test pattern at the digital outputs. In the

A4 TPM

ECM, this input is ignored and the Test Pattern

Mode can only be activated through the Control

Non-Demuxed Mode select. Setting this input to

logic-high causes the digital output bus to be in

the 1:1 Non-Demuxed Mode. Setting this input to

A5 NDM logic-low causes the digital output bus to be in the

1:2 Demuxed Mode. This feature is pin-controlled

only and remains active during ECM and Non-

ECM.

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