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ADS8507 Fiches technique(PDF) 5 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation. Click here to check the latest version.
No de pièce ADS8507
Description  16-BIT 40-KSPS LOW POWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH INTERNAL REFERENCE AND PARALLEL/SERIAL INTERFACE
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Fabricant  BURR-BROWN [Burr-Brown (TI)]
Site Internet  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

ADS8507 Fiches technique(HTML) 5 Page - Burr-Brown (TI)

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ADS8507
SLAS381 – DECEMBER 2006
DEVICE INFORMATION (continued)
Terminal Functions
TERMINAL
DIGITAL
DESCRIPTION
I/O
NO.
NAME
1
R1IN
Analog Input.
2
AGND1
Analog sense ground. Used internally as ground reference point. Minimal current flow
3
R2IN
Analog Input.
4
CAP
Reference buffer output. 2.2-µF Tantalum capacitor to ground.
5
REF
Reference input/output. Outputs internal 2.5-V reference. Can also be driven by external system
reference. In both cases, bypass to ground with a 2.2-µF tantalum capacitor.
6
AGND2
Analog ground
7
SB/BTC
I
Selects straight binary or binary 2s complement for output data format. if high, data is output in a
straight binary format. If low, data is output in a binary 2's complement format.
8
EXT/INT
I
Selects external/Internal data clock for transmitting data. If high, data is output synchronized to
the clock input on DATACLK. If low, a convert command initiates the transmission of the data
from the previous conversion, along with 16-clock pulses output on DATACLK.
9
D7
O
Data bit 7 if BYTE is high. Data bit 15 (MSB) if BYTE is low. Hi-Z when CS is high and/or R/C is
low. Leave unconnected when using serial output.
10
D6
O
Data bit 6 if BYTE is high. Data bit 14 if BYTE is low. Hi-Z when CS is high and/or R/C is low.
11
D5
O
Data bit 5 if BYTE is high. Data bit 13 if BYTE is low. Hi-Z when CS is high and/or R/C is low.
12
D4
O
Data bit 4 if BYTE is high. Data bit 12 if BYTE is low. Hi-Z when CS is high and/or R/C is low.
13
D3
O
Data bit 3 if BYTE is high. Data bit 11 if BYTE is low. Hi-Z when CS is high and/or R/C is low.
14
DGND
Digital ground
15
D2
O
Data bit 2 if BYTE is high. Data bit 10 if BYTE is low. Hi-Z when CS is high and/or R/C is low.
16
D1
O
Data bit 1 if BYTE is high. Data bit 9 if BYTE is low. Hi-Z when CS is high and/or R/C is low.
17
D0
O
Data bit 0 (LSB) if BYTE is high. Data bit 8 if BYTE is low. Hi-Z when CS is high and/or R/C is
low.
18
DATACLK
I/O
Either an input or an output depending on the EXT/INT level. Output data is synchronized to this
clock. If EXT/INT is low, DATACLK transmits 16 pulses after each conversion, and then remains
low between conversions.
19
SDATA
O
Serial data output. Data is synchronized to DATACLK, with the format determined by the level of
SB/BTC. In the external clock mode, after 16 bits of data, the ADC outputs the level input on
TAG as long as CS is low and R/C is high. If EXT/INT is low, data is valid on both the rising and
falling edges of DATACLK, and between conversions SDATA stays at the level of the TAG input
when the conversion was started.
20
TAG
I
Tag input for use in the external clock mode. If EXT is high, digital data input from TAG is output
on DATA with a delay that is dependent on the external clock mode.
21
BYTE
I
Selects 8 most significant bits (low) or 8 least significant bits (high) on parallel output pins.
22
R/C
I
Read/convert input. With CS low, a falling edge on R/C puts the internal sample-and-hold into
the hold state and starts a conversion. When EXT/INT is low, this also initiates the transmission
of the data results from the previous conversion.
23
CS
I
Internally ORed with R/C. If R/C is low, a falling edge on CS initiates a new conversion. If
EXT/INT is low, this same falling edge will start the transmission of serial data results from the
previous conversion.
24
BUSY
O
At the start of a conversion, BUSY goes low and stays low until the conversion is completed and
the digital outputs have been updated.
25
PWRD
I
Power down input. If high, conversions are inhibited and power consumption is significantly
reduced. Results from the previous conversion are maintained in the output shift register.
26
REFD
I
REFD High shuts down the internal reference. External reference will be required for
conversions.
27
VANA
Analog Supply. Nominally +5 V. Decouple with 0.1-µF ceramic and 10-µF tantalum capacitors.
28
VDIG
Digital Supply. Nominally +5 V. Connect directly to pin 27. Must be
≤ V
ANA.
5
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