參數(shù)資料
型號(hào)： ADS1218Y2K
英文描述： 8-Channel, 24-Bit ANALOG-TO-DIGITAL CONVERTER with FLASH Memory
中文描述： 8通道，24位模擬數(shù)字轉(zhuǎn)換器與閃存存儲(chǔ)器
文件頁(yè)數(shù)： 1/30頁(yè)
文件大小： 459K
代理商： ADS1218Y2K
8-Channel, 24-Bit
ANALOG-TO-DIGITAL CONVERTER
with FLASH Memory
FEATURES
G
24 BITS NO MISSING CODES
G
0.0015% INL
G
22 BITS EFFECTIVE RESOLUTION
(PGA = 1), 19 BITS (PGA = 128)
G
4K BYTES OF FLASH MEMORY
PROGRAMMABLE FROM 2.7V TO 5.25V
G
PGA FROM 1 TO 128
G
SINGLE CYCLE SETTLING MODE
G
PROGRAMMABLE DATA OUTPUT RATES
UP TO 1kHz
G
PRECISION ON-CHIP 1.25V/2.5V REFERENCE:
ACCURACY: 0.2%
DRIFT: 5ppm/
°
C
G
EXTERNAL DIFFERENTIAL REFERENCE
OF 0.1V TO 2.5V
G
ON-CHIP CALIBRATION
G
PIN COMPATIBLE WITH ADS1216
G
SPI COMPATIBLE
G
2.7V TO 5.25V
G
< 1mW POWER CONSUMPTION
DESCRIPTION
The ADS1218 is a precision, wide dynamic range, delta-sigma, Analog-to-
Digital (A/D) converter with 24-bit resolution and FLASH memory operating
from 2.7V to 5.25V supplies. The delta-sigma, A/D converter provides up to
24 bits of no missing code performance and effective resolution of 22 bits.
The eight input channels are multiplexed. Internal buffering can be selected
to provide a very high input impedance for direct connection to transducers
or low-level voltage signals. Burn out current sources are provided that allow
for the detection of an open or shorted sensor. An 8-bit Digital-to-Analog (D/
A) converter provides an offset correction with a range of 50% of the FSR
(Full-Scale Range).
The PGA (Programmable Gain Amplifier) provides selectable gains of 1 to
128 with an effective resolution of 19 bits at a gain of 128. The A/D
conversion is accomplished with a second-order delta-sigma modulator and
programmable sinc filter. The reference input is differential and can be used
for ratiometric conversion. The on-board current DACs (Digital-to-Analog
Converters) operate independently with the maximum current set by an
external resistor.
The serial interface is SPI compatible. Eight bits of digital I/O are also provided
that can be used for input or output. The ADS1218 is designed for high-resolution
measurement applications in smart transmitters, industrial process control, weight
scales, chromatography, and portable instrumentation.
APPLICATIONS
G
INDUSTRIAL PROCESS CONTROL
G
LIQUID/GAS CHROMATOGRAPHY
G
BLOOD ANALYSIS
G
SMART TRANSMITTERS
G
PORTABLE INSTRUMENTATION
G
WEIGHT SCALES
G
PRESSURE TRANSDUCERS
ADS1218
SPI is a registered trademark of Motorola.
ADS1218
SBAS187 – SEPTEMBER 2001
www.ti.com
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Copyright 2001, Texas Instruments Incorporated
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
BUF
PGA
A = 1:128
+
1.25V or
2.5V
Reference
Clock Generator
Registers
Serial Interface
2nd-Order
Modulator
RAM
4K Bytes
FLASH
AGND
AV
DD
IN+
IN
–
R
DAC
V
REFOUT
V
RCAP
V
REF+
V
REF
–
X
IN
X
OUT
DSYNC
PDWN
RESET
DRDY
BUFEN
DGND
DV
DD
WREN
Digital I/O
Interface
D7
...
D0
SCLK
D
IN
D
OUT
CS
POL
MUX
A
IN
0
A
IN
1
A
IN
2
A
IN
3
A
IN
4
A
IN
5
A
IN
6
A
IN
7
A
INCOM
IDAC1
Controller
Program-
mable
Digital
Filter
2
μ
A
AV
DD
8-Bit
IDAC
IDAC2
8-Bit
IDAC
Offset
DAC
AGND
2
μ
A
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