ADS8284IRGCR datasheet(4/46 Pages) TI1

tên linh kiện	ADS8284IRGCR

Giải thích chi tiết về linh kiện	ADS8284 18-BIT, 1-MSPS, Pseudo-Bipolar Differential SAR ADC with On-Chip ADC Driver (OPA) and 4-Channel Differential Multiplexer

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Not Recommended for New Designs

ADS8284

SLAS628A – MARCH 2009 – REVISED APRIL 2014

www.ti.com

Pin Functions

I/O

DESCRIPTION

NO

NAME

MULTIPLEXER INPUT PINS

Non-inverting analog input for differential multiplexer channel number 0. Device performance is optimized for 50-

Ω source

17

CH0P

I

impedance at this input.

Inverting analog input for differential multiplexer channel number 0. Device performance is optimized for 50-

Ω source

18

CH0M

I

impedance at this input.

Non-inverting analog input for differential multiplexer channel number 1. Device performance is optimized for 50-

Ω source

19

CH1P

I

impedance at this input.

Inverting analog input for differential multiplexer channel number 1. Device performance is optimized for 50-

Ω source

20

CH1M

I

impedance at this input.

Non-inverting analog input for differential multiplexer channel number 2. Device performance is optimized for 50-

Ω source

29

CH2P

I

impedance at this input.

Inverting analog input for differential multiplexer channel number 2. Device performance is optimized for 50-

Ω source

30

CH2M

I

impedance at this input.

Non-inverting analog input for differential multiplexer channel number 3. Device performance is optimized for 50 ohm source

31

CH3P

I

impedance at this input.

Inverting analog input for differential multiplexer channel number 3. Device performance is optimized for 50-

Ω source

32

CH3M

I

impedance at this input.

ADC INPUT PINS

25

INP

I

ADC Non inverting input., connect 1-nF capacitor across INP and INM

27

INM

I

ADC Inverting input, connect 1-nF capacitor across INP and INM

REFERENCE INPUT/ OUTPUT PINS

8, 9

REFM

I

Reference ground.

10

REFIN

I

Reference Input. Add 0.1-

μF decoupling capacitor between REFIN and REFM.

11

REFOUT

O

Reference Output. Add 1-

μF capacitor between the REFOUT pin and REFM pin when internal reference is used.

14

VCMO

O

This pin outputs REFIN/2 and can be used to set common-mode voltage of differential analog inputs.

15

BUF-REF

O

Buffered reference output. Useful to level shift bipolar signals using external resistors.

POWER CONTROL PINS

21

PD-RBUF

I

High on this pin powers down the reference buffer (BUF-REF).

MULTIPLEXER CONTROL PINS

33

AUTO

I

High level on this pin selects auto mode for multiplexer scanning. Low level selects manual mode of multiplexer scanning

In auto mode (AUTO = 1) multiplexer channel selection is reset to CH0 on rising edge of MXCLK while C3 = 1. The pin is do

34

C3

I

not care in manual mode.

Acts as multiplexer address bit when AUTO = 0 (manual mode). In auto mode (AUTO = 1) C2 and C1 select the last

35

C2

I

multiplexer channel (channel count) in the auto scan sequence.

Acts as multiplexer address LSB when AUTO = 0 (manual mode). In auto mode (AUTO = 1) C2 and C1 select the last

36

C1

I

multiplexer channel (channel count) in the auto scan sequence.

Multiplexer channel is selected on rising edge of MXCLK irrespective of whether it is auto or manual mode. Device BUSY

37

MXCLK

I

output can be connected to MXCLK so that device selects next channel at the end of every sample.

ADC DATA BUS

8-BIT BUS

16-BIT BUS

18-BIT BUS

42-49,

Data Bus

BYTE = 0

BYTE = 1

BYTE = 0

52-61

BUS18/16 = 0

BUS18/16 = 1

BUS18/16 = 0

BUS18/16 = 1

BUS18/16 = 0

42

DB17

O

D17 (MSB)

D9

All ones

D17 (MSB)

All ones

D17 (MSB)

43

DB16

O

D16

D8

All ones

D16

All ones

D16

44

DB15

O

D15

D7

All ones

D15

All ones

D15

45

DB14

O

D14

D6

All ones

D14

All ones

D14

46

DB13

O

D13

D5

All ones

D13

All ones

D13

47

DB12

O

D12

D4

All ones

D12

All ones

D12

48

DB11

O

D11

D3

D1

D11

All ones

D11

49

DB10

O

D10

D2

D0 (LSB)

D10

All ones

D10

52

DB9

O

D9

All ones

D9

All ones

D9

53

DB8

O

D8

All ones

D8

All ones

D8

54

DB7

O

D7

All ones

D7

All ones

D7

55

DB6

O

D6

All ones

D6

All ones

D6

56

DB5

O

D5

All ones

D5

All ones

D5

4

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nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Texas Instruments	ADS8284IRGCR	1Mb / 38P	[Old version datasheet] 18-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER

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Mô tả tương tự - ADS8284IRGCR

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Texas Instruments	ADS8284	1Mb / 38P	[Old version datasheet] 18-BIT, 1-MSPS, PSEUDO-BIPOLAR DIFFERENTIAL SAR ADC WITH ON-CHIP ADC DRIVER (OPA) AND 4-CHANNEL DIFFERENTIAL MULTIPLEXER
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