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ADS7253 数据表(PDF) 42 Page - Texas Instruments

部件名 ADS7253
功能描述  ADSxx54 Dual, High-Speed, 16-, 14-, and 12-Bit, Simultaneous-Sampling, Analog-to-Digital Converters
PDF  73 Pages
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制造商  TI2 [Texas Instruments]
网页  https://www.ti.com
标志 TI2 - Texas Instruments

ADS7253 数据表(HTML) 42 Page - Texas Instruments

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background image
1
2
3
4
5
14
15
16
17
18
19
20
21
30
31
32
SCLK
CS
0
0
D13-
A
D12-
A
D11-
A
D2-A
D1-A
D0-A
0
0
D13-
B
D12-
B
ADS7853, ADS7854
SDO_A
Sample
N
Sample
N+1
tTHROUGHPUT
D11-
B
D2-B
D1-B
D0-B
tPH_CS
Data From Sample N
B15
B14
B13
B12
B2
B1
B0
X
X
X
X
SDI
X
ADS7253, ADS7254
SDO_A
X
X
X
0
0
D11-
A
D10-
A
D9-A
D0-A
0
0
0
0
D11-
B
D10-
B
D9-B D0-B
0
0
13
D3-A
D1-A
B3
tCONV
tACQ
tCONV
tACQ
tSCLK
All Devices
SDO_B
ADS8354, ADS7854, ADS7254
SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014
www.ti.com
8.5.3.2.4
16-CLK, Single-SDO Mode (CFR.B11 = 1, CFR.B10 = 1)
The 16-CLK, single-SDO mode provides the option of using only one SDO pin (SDO_A) and a lower-speed clock
to read the conversion results of both ADCs. This interface mode is not supported by the ADS8354.
For the ADS7854 and ADS7254, this mode can be selected by writing CFR.B11 = 1 and CFR.B10 = 1. The
SDO_A pin is used to output the conversion results of both ADCs (ADC_A and ADC_B). SDO_B remains in 3-
state and can be treated as a no connect (NC) pin. Figure 93 shows a detailed timing diagram for this mode.
Figure 93. 16-CLK, Single-SDO Mode Timing Diagram
A CS falling edge brings the serial data bus out of 3-state and also outputs a 0 on the SDO_A pin. The
subsequent SCLK falling edges are used for conversion and for data transfer using the serial interface, as shown
in Table 17.
The sample-and-hold circuit goes back into sample mode as soon as the conversion process is over.
Table 17. Data Launch Edge
LAUNCH EDGE
DEVICE
PIN
CS
SCLK
CS
↓
↓1
↓2
—
↓13
↓14
↓15
↓16
↓17
↓18
—
↓29
↓30
↓31
↓32 ...
↑
ADS7854
SDO-A
0
0
D13_A
—
D2_A
D1_A
D0_A
0
0
D13_B
—
D2_B
D1_B
D0_B
0 ...
Hi-Z
ADS7254
SDO-A
0
0
D11_A
—
D0_A
0
0
0
0
D11_B
—
D0_B
0
0
0 ...
Hi-Z
42
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Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links: ADS8354 ADS7854 ADS7254



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