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ADS8558IPMR Datenblatt(Datasheet) 4 Page - TI store

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Teile-Nr. ADS8558IPMR
Beschreibung  12-Bit, Six-Channel, Simultaneous Sampling Analog-to-Digital Converters
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Hersteller  TI1 [TI store]
Homepage  http://www.ti.com
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4
ADS8556, ADS8557, ADS8558
SBAS404D – OCTOBER 2006 – REVISED FEBRUARY 2016
www.ti.com
Product Folder Links: ADS8556 ADS8557 ADS8558
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Copyright © 2006–2016, Texas Instruments Incorporated
(1)
AI = analog input; AIO = analog input/output; DI = digital input; DO = digital output; DIO = digital input/output; and P = power supply.
Pin Functions
PIN
TYPE(1)
DESCRIPTION
NAME
NO.
PARALLEL INTERFACE (PAR/SER = 0)
SERIAL INTERFACE (PAR/SER = 1)
DB14/REFBUFEN
1
DIO, DI
Data bit 14 input/output
Output is '0' for the ADS8557, ADS8558
Hardware mode (HW/SW = 0):
Reference buffers enable input.
When low, all reference buffers are enabled
(mandatory if internal reference is used). When
high, all reference buffers are disabled.
Software mode (HW/SW = 1):
Connect to BGND or BVDD.
The reference buffers are controlled by bit C24
(REFBUF) in control register (CR).
DB13/SDI
2
DIO, DI
Data bit 13 input/output
Output is MSB for the ADS8557
and '0' for the ADS8558
Hardware mode (HW/SW = 0):
Connect to BGND
Software mode (HW/SW = 1):
Serial data input
DB12
3
DIO
Data bit 12 input/output
Output is '0' for the ADS8558
Connect to BGND
DB11
4
DIO
Data bit 11 input/output
Output is MSB for the ADS8558
Connect to BGND
DB10/SDO_C
5
DIO, DO
Data bit 10 input/output
When SEL_C = 1, data output for channel C
When SEL_C = 0, tie this pin to BGND
DB9/SDO_B
6
DIO, DO
Data bit 9 input/output
When SEL_B = 1, data output for channel B
When SEL_B = 0, tie this pin to BGND
When SEL_C = 0, data from channel C1 are
also available on this output
DB8/SDO_A
7
DIO, DO
Data bit 8 input/output
Data output for channel A
When SEL_C = 0, data from channel C0 are
also available on this output
When SEL_C = 0 and SEL_B = 0, SDO_A acts
as the single data output for all channels
BGND
8
P
Buffer IO ground, connect to digital ground plane
BVDD
9
P
Buffer IO supply, connect to digital supply (2.7 V to 5.5 V). Decouple with a 1-
μF ceramic
capacitor or a combination of 100-nF and 10-
μF ceramic capacitors to BGND.
DB7/HBEN/DCEN
10
DIO, DI,
DI
Word mode (WORD/BYTE = 0): Data bit 7
input/output
Daisy-chain enable input.
When high, DB[5:3] serve as daisy-chain inputs
DCIN[A:C]. If daisy-chain mode is not used,
connect to BGND.
Byte mode (WORD/BYTE = 1):
High byte enable input.
When high, the high byte is output first on
DB[15:8]. When low, the low byte is output first
on DB[15:8].
DB6/SCLK
11
DIO, DI
Word mode (WORD/BYTE = 0):
Data bit 6 input/output
Serial interface clock input (36 MHz, max)
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
DB5/DCIN_A
12
DIO, DI
Word mode (WORD/BYTE = 0):
Data bit 5 input/output
When DCEN = 1, daisy-chain data input for
channel A.
When DCEN = 0, connect to BGND.
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
DB4/DCIN_B
13
DIO, DI
Word mode (WORD/BYTE = 0):
Data bit 4 input/output
When SEL_B = 1 and DCEN = 1,
daisy-chain data input for channel B.
When DCEN = 0, connect to BGND.
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
DB3/DCIN_C
14
DIO, DI
Word mode (WORD/BYTE = 0):
Data bit 3 input/output
When SEL_C = 1 and DCEN = 1,
daisy-chain data input for channel C.
When DCEN = 0, connect to BGND.
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD




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