ChipFind - документация

Электронный компонент: ADS1234

Скачать:  PDF   ZIP

Document Outline

Burr Brown Products
from Texas Instruments
PRODUCT PREVIEW
FEATURES
DESCRIPTION
APPLICATIONS
Input
Mux
ADC
REFP REFN
PGA
A = 1, 2, 64,
128
CAP
DVDD
DGND
AGND
A1/TEMP
(1)
A0
NOTE: (1) A1 for ADS1234, TEMP for ADS1232.
AINP1
AINN1
AINP2
AINN2
AINP3
AINN3
AINP4
AINN4
ADS1234 Only
SCLK
SPEED
DRDY/DOUT
PDWN
GAIN [1:0]
AVDD
CAP
External Oscillator
Internal Oscillator
XTAL1/CLKIN XTAL2
ADS1232
ADS1234
SBAS350 JUNE 2005
Ultra Low-Noise, 24-Bit Analog-to-Digital Converter
Up to 23.5 Effective Bits
The
ADS1232
and
ADS1234
are
precision
analog-to-digital (A/D) converters featuring true 23.5
RMS Noise:
effective-bit performance and exceptional ease of
17nV at 10Hz
use. Selectable gains of 1, 2, 64, or 128 allow
44nV at 80Hz
full-scale
differential
input
ranges
of
2.5V
to
On-Board Low Noise Gain-Amp
19.5mV with a +5V reference. While the ADS1232
offers a two-channel differential input and a built-in
19.2-Bit Noise-Free Resolution at Gain = 64
temperature
sensor,
the
ADS1234
features
a
Simultaneous 50Hz and 60Hz Rejection:
four-channel differential input multiplexer. A very
Internal Clock: 110 dB
low-noise Gain-Amp features low differential input
current
to
minimize
errors
when
using
External Clock: 130 dB
high-impedance transducers. An on-board oscillator
1% Low-Drift On-Board Oscillator
is provided for excellent 50Hz and 60Hz rejection
Selectable Gains of 1, 2, 64, and 128
without an external clock source. The devices also
feature a low current driver to accommodate an
Selectable 10/80SPS Conversion Rates
external crystal; they also accept external clock
2-Channel Differential Input with Built-In Temp
sources for all applications.
sensor (ADS1232)
All of the features of the ADS1232/ADS1234 are
4-Channel Differential Input (ADS1234)
hard-wire selected, without software programming.
External Reference up to AVDD
Data is accessed over a simple serial interface
Simple Serial Digital Interface
compatible with popular microcontrollers such as the
MSP430. The ADS1232 is available in the 24-pin
Supply Range: 2.7V to 5.3V
TSSOP package, and the ADS1234 is available in
40
C to +105
C Temperature Range
the 28-pin TSSOP.
Weigh Scales
Strain Gauges
Bridge Sensors
Industrial Process Control
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.
PRODUCT PREVIEW information concerns products in the forma-
Copyright 2005, Texas Instruments Incorporated
tive or design phase of development. Characteristic data and other
specifications are design goals. Texas Instruments reserves the
right to change or discontinue these products without notice.
www.ti.com
PRODUCT PREVIEW
ABSOLUTE MAXIMUM RATINGS
ADS1232
ADS1234
SBAS350 JUNE 2005
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated
circuits be handled with appropriate precautions. Failure to observe proper handling and installation
procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision
integrated circuits may be more susceptible to damage because very small parametric changes could
cause the device not to meet its published specifications.
ORDERING INFORMATION
(1)
SPECIFIED
PACKAGE
PACKAGE
ORDERING
TRANSPORT MEDIA,
PRODUCT
PACKAGE-LEAD
TEMPERATURE
DESIGNATOR
MARKING
NUMBER
QUANTITY
RANGE
ADS1232IPWT
Tape and Reel, 250
ADS1232
TSSOP-24
PW
40C to 105C
ADS1232
ADS1232IPWR
Tape and Reel, 2500
ADS1234IPWT
Tape and Reel, 250
ADS1234
TSSOP-28
PW
40C to 105C
ADS1234
ADS1234IPWR
Tape and Reel, 2500
(1)
For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
over operating free-air temperature range (unless otherwise noted)
(1)
ADS1232, ADS1234
UNIT
AVDD to AGND
0.3 to +6
V
DVDD to DGND
0.3 to +6
V
AGND to DGND
0.3 to +0.3
V
Input Current
100, Momentary
mA
Input Current
10, Continuous
mA
Analog Input Voltage to AGND
0.3 to AVDD + 0.3
V
Digital Input Voltage to DGND
0.3 to DVDD + 0.3
V
Maximum Junction Temperature
+150
C
Operating Temperature Range
40 to +105
C
Storage Temperature Range
60 to +150
C
Lead Temperature (soldering, 10s)
+300
C
(1)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating
Conditions
is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
2
www.ti.com
PRODUCT PREVIEW
ELECTRICAL CHARACTERISTICS: V
REF
= +5V
ADS1232
ADS1234
SBAS350 JUNE 2005
All specifications T
A
= 40C to +105C, AVDD = DVDD = VREFP = +5V, VREFN = AGND, Internal Oscillator, SPEED =
Low, Gain = 64 (unless otherwise specified).
ADS1232, ADS1234
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Analog Inputs
Full-Scale Input Voltage
0.5V
REF
/Gain
V
(AIN
P
- AIN
N
)
AINxP or AINxN
AGND 0.1
AVDD + 0.1
V
with respect to GND, Gain = 1
Common-mode Input Range
Gain = 64, 128
(0.5)AVDD 1
(0.5)AVDD + 1
V
Gain = 1, 2
500
nA
Differential Input Current
Gain = 64, 128
50
nA
System Performance
Resolution
No missing codes
24
Bits
Internal Oscillator, SPEED = High
TBD
80
TBD
SPS
Internal Oscillator, SPEED = Low
TBD
10
TBD
SPS
Conversion Rate
External Oscillator, SPEED = High
f
CLK
/ 61440
SPS
External Oscillator, SPEED = Low
f
CLK
/ 491520
SPS
Digital Filter Settling Time
Full Settling
4
Conversions
Differential input, End point fit
0.0002
0.0015
% of FSR
(1)
Gain = 1, 2
Integral Non-Linearity (INL)
Differential input, End point fit
0.0010
TBD
% of FSR
Gain = 64, 128
Gain = 1
0.2
TBD
ppm of FS
Input Offset Error
(2)
Gain = 64
2
TBD
ppm of FS
Gain = 1
1
V/C
Input Offset Error Drift
Gain = 64
15
nV/C
Gain = 1
0.001
TBD
%
Gain Error
(3)
Gain = 64
0.001
TBD
%
Gain = 1
0.5
ppm/
C
Gain Error Drift
Gain = 64
4
ppm/
C
Internal oscillator, 50Hz and 60Hz
100
110
dB
Normal-mode Rejection
(4)
External oscillator,
120
130
dB
50Hz and 60Hz,
1Hz
at DC, Gain = 1,
VDD = 1V
TBD
100
dB
Common-mode Rejection
at DC, Gain = 64,
VDD = 0.1V
TBD
75
dB
Input-Referred Noise
See Noise Performance Tables
at DC, Gain = 1,
VDD = 1V
TBD
100
dB
Power-Supply Rejection
at DC, Gain = 64,
VDD = 0.1V
TBD
85
dB
Voltage Reference Input
Voltage Reference Input
V
REF
= VREFP - VREFN
1
AVDD AVDD + 0.1V
V
(V
REF
)
Negative Reference Input
AGND 0.1
VREFP 1.0
V
(VREFN)
Positive Reference Input
VREFN + 1.0
AVDD + 0.1
V
(VREFP)
Voltage Reference
50
nA
Input Current
(1)
FSR = full scale range = V
REF
/Gain
(2)
Offset calibration can minimize these errors to the level of noise at any temperature.
(3)
Gain errors are calibrated at the factory (AVDD = +5V, all gains, T
A
= +25
C).
(4)
Specification is assured by the combination of design and final production test.
3
www.ti.com
PRODUCT PREVIEW
ADS1232
ADS1234
SBAS350 JUNE 2005
ELECTRICAL CHARACTERISTICS: V
REF
= +5V (continued)
All specifications T
A
= 40C to +105C, AVDD = DVDD = VREFP = +5V, VREFN = AGND, Internal Oscillator, SPEED =
Low, Gain = 64 (unless otherwise specified).
ADS1232, ADS1234
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNIT
Digital
Logic Levels
V
IH
0.6 DVDD
DVDD + 0.1
V
V
IL
DGND
0.3 DVDD
V
V
OH
I
OH
= 1mA
DVDD 0.4
V
V
OL
I
OL
= 1mA
0.2 DVDD
V
Input Leakage
0 < V
IN
< DVDD
10
A
Power Supply
Power Supply Voltage
2.7
5.3
V
(AVDD, DVDD)
Normal mode, AVDD = 3V, Gain = 1, 2
600
TBD
A
Normal mode, AVDD = 3V,
1500
TBD
A
Gain = 64, 128
Normal mode, AVDD = 5V, Gain = 1, 2
700
TBD
A
Analog Supply Current
Normal mode, AVDD = 5V,
1600
TBD
A
Gain = 64, 128
Standby mode
0.1
TBD
A
Power-down
0.1
TBD
A
Normal mode, DVDD = 3V, Gain = 1, 2
90
TBD
A
Normal mode, DVDD = 3V,
90
TBD
A
Gain = 64, 128
Normal mode, DVDD = 5V, Gain = 1, 2
110
TBD
A
Digital Supply Current
Normal mode, DVDD = 5V,
110
TBD
A
Gain = 64, 128
Standby mode, SCLK = High
50
TBD
A
Power-down
0.1
TBD
A
Normal mode, AVDD = DVDD = 3V,
2.1
TBD
mW
Gain = 1, 2
Normal mode, AVDD = DVDD = 5V,
4
TBD
mW
Gain = 1, 2
Normal mode, AVDD = DVDD = 3V,
4.8
TBD
mW
Power Dissipation, Total
Gain = 64, 128
Normal mode, AVDD = DVDD = 5V,
8.6
TBD
mW
Gain = 64, 128
Standby
TBD
TBD
mW
Power-down
TBD
TBD
mW
4
www.ti.com
PRODUCT PREVIEW
DEVICE INFORMATION
DVDD
DGND
XTAL1/CLKIN
XTAL2
DGND
DGND
A1
A0
CAP
CAP
AINP1
AINN1
AINP3
AINN3
DRDY/DOUT
SCLK
PDWN
SPEED
GAIN1
GAIN0
AVDD
AGND
REFP
REFN
AINP2
AINN2
AINP4
AINN4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
ADS1234
DVDD
DGND
XTAL1/CLKIN
XTAL2
DGND
DGND
TEMP
A0
CAP
CAP
AINP1
AINN1
DRDY/DOUT
SCLK
PDWN
SPEED
GAIN1
GAIN0
AVDD
AGND
REFP
REFN
AINP2
AINN2
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
ADS1232
ADS1232
ADS1234
SBAS350 JUNE 2005
5