ADC 6 Spécifications télécharger pdf (Page 13)

GND

A GND

100:100:

AGND

100

BIAS

50k

ADC12D1800RF

www.ti.com

SNAS518I –JULY 2011–REVISED JANUARY 2014

Table 2-1. Analog Front-End and Clock Balls (continued)

Ball No. Name Equivalent Circuit Description

Reference Clock Input. When the AutoSync

feature is active, and the ADC12D1800RF is in

Slave Mode, the internal divided clocks are

Y4/W5 RCLK+/- synchronized with respect to this input clock. The

delay on this clock may be adjusted when

synchronizing multiple ADCs. This feature is

available in ECM via Control Register (Addr: Eh).

Reference Clock Output 1 and 2. These signals

provide a reference clock at a rate of CLK/4, when

enabled, independently of whether the ADC is in

Master or Slave Mode. They are used to drive the

RCLK of another ADC12D1800RF, to enable

automatic synchronization for multiple ADCs

Y5/U6 RCOut1+/-

(AutoSync feature). The impedance of each trace

V6/V7 RCOut2+/-

from RCOut1 and RCOut2 to the RCLK of another

ADC12D1800RF should be 100Ω differential.

Having two clock outputs allows the auto-

synchronization to propagate as a binary tree. Use

the DOC Bit (Addr: Eh, Bit 1) to enable/ disable

this feature; default is disabled.

Table 2-2. Control and Status Balls

Ball No. Name Equivalent Circuit Description

Dual Edge Sampling (DES) Mode select. In the

Non-Extended Control Mode (Non-ECM), when

this input is set to logic-high, the DES Mode of

operation is selected, meaning that the VinI input

is sampled by both channels in a time-interleaved

manner. The VinQ input is ignored. When this

V5 DES input is set to logic-low, the device is in Non-DES

Mode, i.e. the I- and Q-channels operate

independently. In the Extended Control Mode

(ECM), this input is ignored and DES Mode

selection is controlled through the Control Register

by the DES Bit (Addr: 0h, Bit 7); default is Non-

DES Mode operation.

Calibration Delay select. By setting this input logic-

high or logic-low, the user can select the device to

wait a longer or shorter amount of time,

V4 CalDly respectively, before the automatic power-on self-

calibration is initiated. This feature is pin-controlled

only and is always active during ECM and Non-

ECM.

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