ADC 6 Especificações descarregar pdf (Página 43)

ADC12D1800RF

www.ti.com

SNAS518I –JULY 2011–REVISED JANUARY 2014

6.2.1.4 Calibration Pin (CAL)

The Calibration (CAL) Pin may be used to execute an on-command calibration or to disable the power-on

calibration. The effect of calibration is to maximize the dynamic performance. To initiate an on-command

calibration via the CAL pin, bring the CAL pin high for a minimum of t

CAL_H

input clock cycles after it has

been low for a minimum of t

CAL_L

input clock cycles. Holding the CAL pin high upon power-on will prevent

execution of the power-on calibration. In ECM, this pin remains active and is logically OR'd with the CAL

bit.

To use this feature in ECM, use the CAL bit in the Configuration Register (Addr: 0h; Bit: 15). See

Calibration Feature for more information.

6.2.1.5 Calibration Delay Pin (CalDly)

The Calibration Delay (CalDly) Pin selects whether a shorter or longer delay time is present, after the

application of power, until the start of the power-on calibration. The actual delay time is specified as t

CalDly

and may be found in Converter Electrical Characteristics Calibration. This feature is pin-controlled only

and remains active in ECM. It is recommended to select the desired delay time prior to power-on and not

dynamically alter this selection.

See Calibration Feature for more information.

6.2.1.6 Power Down I-channel Pin (PDI)

The Power Down I-channel (PDI) Pin selects whether the I-channel is powered down (logic-high) or active

(logic-low). The digital data output pins, DI and DId, (both positive and negative) are put into a high

impedance state when the I-channel is powered down. Upon return to the active state, the pipeline will

contain meaningless information and must be flushed. The supply currents (typicals and limits) are

available for the I-channel powered down or active and may be found in Converter Electrical

Characteristics Power Supply Characteristics. The device should be recalibrated following a power-cycle

of PDI (or PDQ).

This pin remains active in ECM. In ECM, either this pin or the PDI bit (Addr: 0h; Bit: 11) in the Control

6.2.1.7 Power Down Q-channel Pin (PDQ)

The Power Down Q-channel (PDQ) Pin selects whether the Q-channel is powered down (logic-high) or

active (logic-low). This pin functions similarly to the PDI pin, except that it applies to the Q-channel. The

PDI and PDQ pins function independently of each other to control whether each I- or Q-channel is

powered down or active.

This pin remains active in ECM. In ECM, either this pin or the PDQ bit (Addr: 0h; Bit: 10) in the Control

6.2.1.8 Test Pattern Mode Pin (TPM)

The Test Pattern Mode (TPM) Pin selects whether the output of the ADC12D1800RF is a test pattern

(logic-high) or the converted analog input (logic-low). The ADC12D1800RF can provide a test pattern at

the four output buses independently of the input signal to aid in system debug. In TPM, the ADC is

disengaged and a test pattern generator is connected to the outputs, including ORI and ORQ. See Test

Pattern Mode for more information.

6.2.1.9 Full-Scale Input Range Pin (FSR)

The Full-Scale Input Range (FSR) Pin sets the full-scale input range for both the I- and Q-channel; for the

ADC12D1800RF, only the logic-high setting is available. The input full-scale range is specified as V

IN_FSR

in Converter Electrical Characteristics Analog Input / Output and Reference Characteristics. In Non-ECM,

the full-scale input range for each I- and Q-channel may not be set independently, but it is possible to do

so in ECM. The device must be calibrated following a change in FSR to obtain optimal performance.

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