ADS8320-HT Datasheet, PDF (18/27 Pages) Texas Instruments – 16-BIT, HIGH-SPEED, 2.7-V TO 5-V, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER

ADS8320-HT
SBAS521A – DECEMBER 2010 – REVISED APRIL 2012
1.4V
D_OUT
3kΩ
100pF
C_LOAD
Test Point
Load Circuit for t_dDO, t_r, and t_f
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D_OUT
t_r
V_OH
V_OL
t_f
Voltage Waveforms for D_OUT Rise and Fall Times, t_r, t_f
DCLOCK
V_IL
D_OUT
t_hDO
t_dDO
V_OH
V_OL
Voltage Waveforms for D_OUT Delay Times, t_dDO
Test Point
D_OUT
3kΩ
100pF
C_LOAD
V_CC
t_dis Waveform 2, t_en
t_dis Waveform 1
Load Circuit for t_dis and t_en
CS/SHDN
DOUT
Waveform 1⁽¹⁾
DOUT
Waveform 2⁽²⁾
t_dis
Voltage Waveforms for t_dis
V_IH
90%
10%
CS/SHDN
DCLOCK
D_OUT
1
4
5
V_OL
B11
t_en
Voltage Waveforms for t_en
NOTES: (1) Waveform 1 is for an output with internal conditions such that the output
is HIGH unless disabled by the output control. (2) Waveform 2 is for an output with
internal conditions such that the output is LOW unless disabled by the output control.
Figure 22. Timing Diagrams and Test Circuits for the Parameters in Table 2
Figure 23 shows the current consumption of the ADS8320 versus sample rate. For this graph, the converter is
clocked at 2.4 MHz regardless of the sample rate—CS is HIGH for the remaining sample period. Figure 24 also
shows current consumption versus sample rate. However, in this case, the DCLOCK period is 1/24th of the
sample period—CS is HIGH for one DCLOCK cycle out of every 16.
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