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PDF ADS1274 Data sheet ( Hoja de datos )
| Número de pieza | ADS1274 | |
| Descripción | (ADS1274 / ADS1278) 24-Bit Analog-to-Digital Converters | |
| Fabricantes | Burr-Brown | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ADS1274 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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ADS1274
ADS1278
ADS1274
ADS1278
SBAS367 – JUNE 2007
Quad/Octal, Simultaneous Sampling, 24-Bit Analog-to-Digital Converters
FEATURES
1
•234 Simultaneously Measure Four/Eight Channels
• Up to 128kSPS Data Rate
• AC Performance:
62kHz Bandwidth
111dB SNR (High-Resolution Mode)
–108dB THD
• DC Accuracy:
0.8μV/°C Offset Drift
1.3ppm/°C Gain Drift
• Selectable Operating Modes:
High-Speed: 128kSPS, 106dB SNR
High-Resolution: 52kSPS, 111dB SNR
Low-Power: 52kSPS, 31mW/ch
Low-Speed: 10kSPS, 7mW/ch
• Linear Phase Digital Filter
• SPI™ or Frame-Sync Serial Interface
• Low Sampling Aperture Error
• Modulator Output Option (digital filter bypass)
• Analog Supply: 5V
• Digital Core: 1.8V
• I/O Supply: 1.8V to 3.3V
APPLICATIONS
• Vibration/Modal Analysis
• Multi-Channel Data Acquisition
• Acoustics/Dynamic Strain Gauges
• Pressure Sensors
VREFP VREFN AVDD DVDD IOVDD
DESCRIPTION
Based on the single-channel ADS1271, the ADS1274
(quad) and ADS1278 (octal) are 24-bit, delta-sigma
(ΔΣ) analog-to-digital converters (ADCs) with data
rates up to 128k samples per second (SPS), allowing
simultaneous sampling of four or eight channels. The
devices are offered in identical packages, permitting
drop-in expandability.
Traditionally, industrial delta-sigma ADCs offering
good drift performance use digital filters with large
passband droop. As a result, they have limited signal
bandwidth and are mostly suited for dc
measurements. High-resolution ADCs in audio
applications offer larger usable bandwidths, but the
offset and drift specifications are significantly weaker
than respective industrial counterparts. The ADS1274
and ADS1278 combine these types of converters,
allowing high-precision industrial measurement with
excellent dc and ac specifications.
The high-order, chopper-stabilized modulator
achieves very low drift with low in-band noise. The
onboard decimation filter suppresses modulator and
signal out-of-band noise. These ADCs provide a
usable signal bandwidth up to 90% of the Nyquist
rate with less than 0.005dB of ripple.
Four operating modes allow for optimization of speed,
resolution, and power. All operations are controlled
directly by pins; there are no registers to program.
The devices are fully specified over the extended
industrial range (–40°C to +105°C) and are available
in an HTQFP-64 PowerPAD™ package.
VREFP VREFN AVDD DVDD IOVDD
Input1
DS
SPI
and
Input2
Input3
DS
DS
Four
Digital
Filters
Frame-
Sync
Interface
Input4
DS
Control
Logic
AGND
DGND
ADS1274
DRDY/FSYNC
SCLK
DOUT[4:1]
DIN
TEST[1:0]
FORMAT[2:0]
CLK
SYNC
PWDN[4:1]
CLKDIV
MODE[1:0]
Input1
Input2
Input3
Input4
Input5
Input6
Input7
Input8
DS SPI
and
DS Frame-
DS Sync
Interface
DS Eight
Digital
DS Filters
DS Control
Logic
DS
DS
AGND
DGND
ADS1278
DRDY/FSYNC
SCLK
DOUT[8:1]
DIN
TEST[1:0]
FORMAT[2:0]
CLK
SYNC
PWDN[8:1]
CLKDIV
MODE[1:0]
1
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.
PowerPAD is a trademark of Texas Instruments, Inc.
2
SPI is a trademark of Motorola, Inc.
3
All other trademarks are the property of their respective owners.
4
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007, Texas Instruments Incorporated
1 page  
ADS1274
ADS1278
www.ti.com
SBAS367 – JUNE 2007
ELECTRICAL CHARACTERISTICS (continued)
All specifications at TA = –40°C to +105°C, AVDD = +5V, DVDD = +1.8V, IOVDD = +3.3V, fCLK = 27MHz, VREFP = 2.5V,
VREFN = 0V, and all channels active, unless otherwise noted.
Power Supply
AVDD
DVDD
IOVDD
Power-down current
ADS1274
ADS1274
AVDD current
ADS1274
DVDD current
ADS1274
IOVDD current
ADS1274
Power dissipation
ADS1278
ADS1278
AVDD current
ADS1278
DVDD current
ADS1278
IOVDD current
ADS1278
Power dissipation
PARAMETER
AVDD
DVDD
IOVDD
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
High-Speed mode
High-Resolution mode
Low-Power mode
Low-Speed mode
TEST CONDITIONS
ADS1274, ADS1278
MIN TYP
4.75
1.65
1.65
5
1.8
1
1
1
50
50
23
5
18
12
10
2.5
0.15
0.075
0.075
0.02
285
275
135
30
97
97
44
9
23
16
12
2.5
0.25
0.125
0.125
0.035
530
515
245
50
MAX
UNIT
5.25
1.95
3.6
10
15
10
V
V
V
μA
μA
μA
75
75
35
9
24
17
15
4.5
0.5
0.3
0.3
0.15
420
410
210
55
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mA
mW
mW
mW
mW
145 mA
145 mA
64 mA
14 mA
30 mA
20 mA
17 mA
4.5 mA
1 mA
0.5 mA
0.5 mA
0.2 mA
785 mW
765 mW
355 mW
80 mW
Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): ADS1274 ADS1278
5
5 Page 
ADS1274
ADS1278
www.ti.com
SBAS367 – JUNE 2007
TYPICAL CHARACTERISTICS (continued)
At TA = +25°C, High-Speed mode, AVDD = +5V, DVDD = +1.8V, IOVDD = +3.3V, fCLK = 27MHz, VREFP = 2.5V, and
VREFN = 0V, unless otherwise noted.
OUTPUT SPECTRUM
0 High-Resolution Mode
-20 Shorted Input
262,144 Points
-40
-60
-80
-100
-120
-140
-160
-180
1
10 100 1k
Frequency (Hz)
Figure 7.
10k
100k
NOISE HISTOGRAM
25k
High-Resolution Mode
Shorted Input
20k 262,144 Points
15k
10k
5k
0
Output (mV)
Figure 8.
OUTPUT SPECTRUM
0
Low-Power Mode
-20 fIN = 1kHz, -0.5dBFS
32,768 Points
-40
-60
-80
-100
-120
-140
-160
10
100 1k 10k
Frequency (Hz)
Figure 9.
100k
OUTPUT SPECTRUM
0
Low-Power Mode
-20 fIN = 1kHz, -20dBFS
32,768 Points
-40
-60
-80
-100
-120
-140
-160
10
100 1k 10k
Frequency (Hz)
Figure 10.
100k
OUTPUT SPECTRUM
0
Low-Power Mode
-20 Shorted Input
262,144 Points
-40
-60
-80
-100
-120
-140
-160
-180
1
10 100 1k
Frequency (Hz)
Figure 11.
10k
100k
NOISE HISTOGRAM
25k
Low-Power Mode
Shorted Input
20k 262,144 Points
15k
10k
5k
0
Output (mV)
Figure 12.
Copyright © 2007, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): ADS1274 ADS1278
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ADS1274.PDF ] | |
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