ADS7253IPW datasheet(38/71 Pages) TI1

38 / 71 page

SCLK

SDO-A

SDI

Valid Data

SDO-B

Valid Data

No change in device

configuration

Valid data as per device configuration.

B15

B14 B13

B12

R15 R14

Valid Data

Frame (F)

Frame (F+1)

Frame (F+2)

Frame (F+3)

Device configuration for frame (F+3)

Valid Data

No change in device

configuration

ADS8353, ADS7853, ADS7253

SBAS584B – OCTOBER 2013 – REVISED AUGUST 2014

www.ti.com

8.5.3 Data Read Operation

The device supports two types of read operations: reading user-programmable registers and reading conversion

results.

8.5.3.1 Reading User-Programmable Registers

The device supports a readback option for all user-programmable registers: CFR, REFDAC_A, and REFDAC_B.

Figure 90 shows a detailed timing diagram for this operation.

Note that N is a function of the device configuration, as described in Table 4.

Figure 90. Register Readback Timing

To readback the user-programmable register settings, the appropriate control word should be transmitted to the

device during frame (F+1), as shown in Table 9. Frame (F+1) must have at least 48 SCLK falling edges.

Table 9. Control Word to Readback User-Programmable Registers

CONTROL WORD TO BE PROGRAMMED IN FRAME (F+1)

USER-PROGRAMMABLE REGISTER

B[15:12] (Binary)

B[11:0] (Hex)

CFR

0011b

000h

REFDAC_A

0001b

000h

REFDAC_B

0010b

000h

Frame (F+2) must have at least 48 SCLK falling edges. During frame (F+2), SDO_A outputs the contents of the

selected user-programmable register on the first 16 SCLK falling edges (as shown in Table 10) and then outputs

0s for any subsequent SCLK falling edges. The SDO_B pin outputs 0s for all the SCLK falling edges.

Table 10. Register Data Read Back

USER-

DATA READ ON SDO-A IN FRAME (F+2)

PROGRAMMABLE

R15

R14

R13

R12

R11

—

CFR

CFG.B11

—

CFG.B3

CFG.B2

CFG.B1

CFG.B0

REFDAC_A

REFDAC_A.D8

—

REFDAC_A.D0

REFDAC_B

REFDAC_B.D8

—

REFDAC_B.D0

Submit Documentation Feedback

Product Folder Links: ADS8353 ADS7853 ADS7253

ADS7253IPW 数据表(PDF) 38 Page - Texas Instruments

ADS7253IPW 数据表(HTML) 38 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

数据表下载

链接网址

ADS7253IPW 数据表(PDF) 38 Page - Texas Instruments

ADS7253IPW 数据表(HTML) 38 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71

数据表 下载

链接网址

数据表下载