ADS8284 Datasheet, PDF (13/38 Pages) Texas Instruments – 18-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER

ADS8284
www.ti.com................................................................................................................................................................................................... SLAS628 – MARCH 2009
t_w1
t_w2
CONVST
t_pd1
BUSY
t_su1
CS
t_pd3
CONVERT^†
t_(HOLD)
SAMPLING^†
(When CS Toggle)
BYTE
BUS 18/16
t_w4
t_pd2
t_d6
t_(CONV)
t_su(ABORT)
t_h1
t_w3
t_d7
t_(ACQ)
t_su5
t_w7
t_(CONV)
t_su(ABORT)
t_pd4
t_h2
RD = 0
t_en
DB[17:12]
Previous
Hi−Z _D[17:12]
t_dis
Hi−Z
t_en
MSB
D[17:12]
t_dis
t_en
D[9:4]
Repeated
Hi−Z
D[17:12]
DB[11:10]
Previous
Hi−Z _D[11:10]
Hi−Z
Repeated
Hi−Z
D[11:10] D[3:2] D[1:0]
D[11:10]
DB[9:0]
Previous
Hi−Z _{D [9:0]}
Hi−Z
D[9:0]
Repeated
Hi−Z
D [9:0]
†_{Signal internal to device}
Figure 3. Timing for Conversion and Acquisition Cycles with CS Toggling, RD Tied to BDGND
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