ADS54J60 Datasheet, PDF (50/76 Pages) Texas Instruments – Dual-Channel, 16-Bit, 1.0-GSPS Analog-to-Digital Converter

ADS54J60
SBAS706B – APRIL 2015 – REVISED AUGUST 2015
7.5.2.4.3 Register 42h (address = 42h), Main Digital Page (6800h)
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Figure 96. Register 42h
7
6
5
4
0
0
0
0
W-0h
W-0h
W-0h
W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
3
0
W-0h
2
1
0
NYQUIST ZONE
R/W-0h
Table 37. Register 42h Field Descriptions
Bit Field
7-3 0
2-0 NYQUIST ZONE
Type
W
R/W
Reset
0h
0h
Description
Must write 0
The Nyquist zone must be selected for proper interleaving
correction. Control must be enabled (register 4Eh, bit 7).
000 = 1st Nyquist zone (0 MHz to 500 MHz)
001 = 2nd Nyquist zone (500 MHz to 1000 MHz)
010 = 3rd Nyquist zone (1000 MHz to 1500 MHz)
All others = Not used
7.5.2.4.4 Register 43h (address = 43h), Main Digital Page (6800h)
Figure 97. Register 43h
7
6
5
4
0
0
0
0
W-0h
W-0h
W-0h
W-0h
LEGEND: R/W = Read/Write; W = Write only; -n = value after reset
3
0
W-0h
2
0
W-0h
1
0
W-0h
0
FORMAT SEL
R/W-0h
Bit Field
7-1 0
0
FORMAT SEL
Table 38. Register 43h Field Descriptions
Type
W
R/W
Reset
0h
0h
Description
Must write 0
Changes the output format. Set the FORMAT EN bit to enable
control using this bit.
0 = Twos complement
1 = Offset binary
7.5.2.4.5 Register 44h (address = 44h), Main Digital Page (6800h)
Figure 98. Register 44h
7
6
5
4
3
2
1
0
0
DIGITAL GAIN
R/W-0h
R/W-0h
LEGEND: R/W = Read/Write; -n = value after reset
Bit Field
7
0
6-0 DIGITAL GAIN
Table 39. Register 44h Field Descriptions
Type
R/W
R/W
Reset
0h
0h
Description
Must write 0
Digital gain setting. Digital gain must be enabled (register 52h,
bit 0).
Gain in dB = 20log (digital gain / 32)
7Fh = 127 which equals digital gain of 9.5 dB
50
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