GC4114 Datasheet, PDF(41/45 Page) Texas Instruments

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GC4114 Datasheet, PDF (41/45 Pages) Texas Instruments – QUAD TRANSMIT CHIP

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GC4114 QUAD TRANSMIT CHIP

DATA SHEET REV 1.0

7.8 INPUT TEST CONFIGURATION

The serial input configuration and timing can be checked using the following configuration. The input data

is the I/Q pair 0xAA00 and 0x5500. The following configuration will output a known constant if that complex pair is

received correctly. For power of 2 interpolation ratios and where SCALE and BIG_SCALE are set to satisfy:

N3 = 2(SCALE+BIG_SHIFT*12+3), the constant is 0x9090. For non power of 2 ratios or for other SCALE and BIG_SHIFT

settings the constant can be determined as described below. Note that all coefficients except the last two are zero.

Table 17: Input Test Conï¬guration

Control Registers

Channel, Status and Coefï¬cient Pages

Address

Data

Address

Page 0

Page 1

Page 2

Page 3

00 (HEX)

6A->EA->6A1 20 (HEX)

00->022

read only

F03

read only

1. After configuring the chip fire off the one shot by setting to EA, then back to 6A.

2. Initialize to 00, send the one shot, wait at least 4N clocks, and then set to 02.

3. Use F0 to calibrate the expected output and then change to the desired serial input configuration.

To use this configuration change addresses 2, 3 and 4 to reflect the desired interpolation and gain values,

but leave the serial controls set to 0xF0 in address 5. The value on the OUT pins should be a constant. Record that

value and then configure address 5 to match the characteristics of desired the serial input format. If the serial

Texas Instruments Inc.

- 37 -

MAY 22, 2000

This document contains information which may be changed at any time without notice

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