ADS8555 Datasheet, PDF (7/36 Pages) Texas Instruments – 16-Bit, Six-Channel, Simultaneous Sampling ANALOG-TO-DIGITAL CONVERTER

ADS8555
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SBAS531B – DECEMBER 2010 – REVISED FEBRUARY 2011
NAME
DB14/REFBUF_EN
DB13/SDI
DB12
DB11
DB10/SDO_C
DB9/SDO_B
DB8/SDO_A
BGND
BVDD
DB7/HB_EN/DC_EN
DB6/SCLK
DB5/DCIN_A
DB4/DCIN_B
DB3/DCIN_C
DB2/SEL_C
DB1/SEL_B
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PIN DESCRIPTIONS
TYPE ⁽¹⁾
DESCRIPTION
PARALLEL INTERFACE (PAR/SER = 0)
SERIAL INTERFACE (PAR/SER = 1)
DIO/DI Data bit 14 input/output
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).
DIO/DI Data bit 13 input/output
Hardware mode (HW/SW = 0): Connect to BGND
Software mode (HW/SW = 1): Serial data input
DIO Data bit 12 input/output
Connect to BGND
DIO Data bit 11 input/output
Connect to BGND
DIO/DO Data bit 10 input/output
When SEL_C = 1, data output for channel C
When SEL_C = 0, this pin should be tied to BGND
DIO/DO Data bit 9 input/output
When SEL_B = 1, data output for channel B
When SEL_B = 0, this pin should be tied to BGND
When SEL_C = 0, data from channel C1 are also available
on this output
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
P
Buffer I/O ground, connect to digital ground plane
P
Buffer I/O supply, connect to digital supply (2.7V to 5.5V). Decouple with a 1μF ceramic capacitor or a
combination of 100nF and 10μF ceramic capacitors to BGND.
Word mode (WORD/BYTE = 0):
Data bit 7 input/output
DIO/DI/DI
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].
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.
DIO/DI
Word mode (WORD/BYTE = 0):
Data bit 6 input/output
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
Serial interface clock input (36MHz max)
DIO/DI
Word mode (WORD/BYTE = 0):
Data bit 5 input/output
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
When DC_EN = 1, daisy-chain data input for channel A
When DC_EN = 0, connect to BGND
DIO/DI
Word mode (WORD/BYTE = 0):
Data bit 4 input/output
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
When SEL_B = 1 and DC_EN = 1, daisy-chain data input for
channel B
When DC_EN = 0, connect to BGND
DIO/DI
Word mode (WORD/BYTE = 0):
Data bit 3 input/output
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
When SEL_C = 1 and DC_EN = 1, daisy-chain data input for
channel C
When DC_EN = 0, connect to BGND
DIO/DI
Word mode (WORD/BYTE = 0):
Data bit 2 input/output
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
Select SDO_C input.
When high, SDO_C is active. When low, SDO_C is disabled.
DIO/DI
Word mode (WORD/BYTE = 0):
Data bit 1 input/output
Byte mode (WORD/BYTE = 1):
Connect to BGND or BVDD
Select SDO_B input.
When high, SDO_B is active. When low, SDO_B is disabled.
(1) AI = analog input; AIO = analog input/output; DI = digital input; DO = digital output; DIO = digital input/output; and P = power supply.
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