ADC34J42 Datasheet, PDF (6/90 Pages) Texas Instruments – ADC34J4x Quad-Channel, 14-Bit, 50-MSPS to 160-MSPS, Analog-to-Digital Converter with a JESD204B Interface

ADC34J42, ADC34J43, ADC34J44, ADC34J45
SBAS664B – MAY 2014 – REVISED NOVEMBER 2014
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7.4 Summary of Special Mode Registers
Table 1 lists the location, value, and functions of special mode registers in the device.
Dither mode
Special mode 1
Special mode 2
MODE
DIS DITH CHA
DIS DITH CHB
DIS DITH CHC
DIS DITH CHD
SPECIAL MODE 1 CHA
SPECIAL MODE 1 CHB
SPECIAL MODE 1 CHC
SPECIAL MODE 1 CHD
SPECIAL MODE 2 CHA
SPECIAL MODE 2 CHB
SPECIAL MODE 2 CHC
SPECIAL MODE 2 CHD
Table 1. Special Modes Summary
LOCATION
01h [7:6], 134h[5,3]
01h [5:4], 434h[5,3]
01h [3:2], 534h[5,3]
01h [1:0], 234h[5,3]
06h[4:2]
07h[4:2]
08h[4:2]
09h[4:2]
122h[1:0]
422h[1:0]
522h[1:0]
222h[1:0]
VALUE AND FUNCTION
Creates a noise floor cleaner and improves SFDR; see the
Internal Dither Algorithm section.
0000 = Dither disabled
1111 = Dither enabled
Use for better HD3.
000 = Default after reset
010 = Use for frequency < 120 MHz
111 = Use for frequency > 120 MHz
Helps improve HD2.
00 = Default after reset
11 = Improves HD2
7.5 Thermal Information
THERMAL METRIC⁽¹⁾
ADC34J4x
RGZ (VQFN)
UNIT
48 PINS
R_θJA
R_θJC(top)
R_θJB
ψ_JT
ψ_JB
R_θJC(bot)
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
25.7
18.9
3.0
°C/W
0.2
3
0.5
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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