Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
ADS8354, ADS7854, ADS7254
SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014
ADSxx54 Dual, High-Speed, 16-, 14-, and 12-Bit,
Simultaneous-Sampling, Analog-to-Digital Converters
1 Features
•
•
•
•
1
2 Applications
•
•
•
•
•
•
Motor Control:
Position Measurement Using Encoders
Optical Networking: EDFA Gain Control Loops
Protection Relays
Power Quality Measurement
Three-Phase Power Controls
Programmable Logic Controllers
•
•
•
•
•
16-, 14-, and 12-Bit, Pin-Compatible Family
Simultaneous Sampling of Two Channels
Supports Fully-Differential Inputs
High Speed:
– ADS8354: 16 Bits, 700 kSPS
– ADS7854: 14 Bits, 1 MSPS
– ADS7254: 12 Bits, 1 MSPS
Excellent DC Performance:
– ADS8354:
– 16-Bit NMC DNL, ±2.5-LSB Max INL
– ADS7854:
– 14-Bit NMC DNL, ±1.5-LSB Max INL
– ADS7254:
– 12-Bit NMC DNL, ±1-LSB Max INL
Excellent AC Performance:
– ADS8354:
– 93-dB SNR, –100-dB THD
– ADS7854:
– 88-dB SNR, –95-dB THD
– ADS7254:
– 72-dB SNR, –90-dB THD
Dual, Programmable, and Buffered
2.5-V Internal Reference
Fully-Specified Over the Extended Industrial
Temperature Range: –40°C to 125°C
Small Footprint:
WQFN-16 (3-mm × 3-mm) and TSSOP-16
3 Description
The ADS8354, ADS7854, and ADS7254 belong to a
family
of
pin-compatible,
dual,
high-speed,
simultaneous-sampling, analog-to-digital converters
(ADCs) that support fully-differential analog inputs.
Each device includes two individually programmable
reference sources that can be used for system-level
gain calibration. Also, a flexible serial interface that
can operate over a wide power-supply range enables
easy communication with a large variety of host
controllers. Power consumption for a given
throughput can be optimized by using the two low-
power modes supported by the device. All devices
are fully specified over the extended industrial
temperature range (–40°C to 125°C) and are
available in pin-compatible, WQFN-16 (3-mm ×
3-mm) and TSSOP-16 packages.
Device Information
(1)
PART NUMBER
ADSxx54
PACKAGE
TSSOP (16)
WQFN (16)
BODY SIZE (NOM)
5.00 mm × 4.40 mm
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
Typical Application Diagram
1 K
1 K
AVDD
V
IN+
V
CM
VREF
AVDD
+
10
4.7 nF
10
+
AVDD
+
-
THS4521
+
-
V
AINP
+
ADSxx54
AINM
GND
V
IN-
1 K
1 K
INPUT DRIVER
ADS8354 : 16-bit, 700 kSPS
ADS7854 : 14-bit, 1 MSPS
ADS7254 : 12-bit, 1 MSPS
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADS8354, ADS7854, ADS7254
SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features
..................................................................
Applications
...........................................................
Description
.............................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configurations and Functions
.......................
Specifications.........................................................
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
7.9
7.10
7.11
7.12
7.13
7.14
1
1
1
2
3
4
5
8
Detailed Description
............................................
28
8.1
8.2
8.3
8.4
8.5
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
Register Maps and Serial Interface.........................
28
28
29
33
33
9
Application and Implementation
........................
47
9.1 Application Information............................................
47
9.2 Typical Applications ................................................
49
Absolute Maximum Ratings .....................................
5
Handling Ratings.......................................................
5
Recommended Operating Conditions.......................
5
Thermal Information ..................................................
5
Electrical Characteristics: ADS8354 .........................
6
Electrical Characteristics: ADS7854 .........................
7
Electrical Characteristics: ADS7254 .........................
8
Electrical Characteristics: All Devices.......................
9
Timing Requirements: Interface Mode....................
11
Timing Characteristics: Serial Interface ................
11
Typical Characteristics: ADS8354 ........................
13
Typical Characteristics: ADS7854 ........................
17
Typical Characteristics: ADS7254 ........................
22
Typical Characteristics: Common to ADS8354,
ADS7854, and ADS7254 .........................................
27
10 Power-Supply Recommendations
.....................
57
11 Layout...................................................................
58
11.1 Layout Guidelines .................................................
58
11.2 Layout Example ....................................................
58
12 Device and Documentation Support
.................
59
12.1
12.2
12.3
12.4
12.5
Related Links ........................................................
Related Documentation.........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
59
59
59
59
59
13 Mechanical, Packaging, and Orderable
Information
...........................................................
59
4 Revision History
Changes from Revision A (July 2014) to Revision B
•
•
•
Page
Made changes to the ADS8354 preview device and moved to Production Data status ........................................................
1
Changed document status from Mixed Status to Production Data ........................................................................................
1
Corrected cross-reference for
Figure 98
..............................................................................................................................
46
Changes from Original (October 2013) to Revision A
•
Page
Made changes to product preview data sheet........................................................................................................................
1
2
Submit Documentation Feedback
Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links:
ADS8354 ADS7854 ADS7254
ADS8354, ADS7854, ADS7254
www.ti.com
SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014
5 Device Comparison Table
PRODUCT
ADS8354
ADS7854
ADS7254
ADS8353
ADS7853
ADS7253
RESOLUTION
(Bits)
16
14
12
16
14
12
INPUT CONFIGURATION
Fully-differential
Fully-differential
Fully-differential
Single-ended and
pseudo-differential
Single-ended and
pseudo-differential
Single-ended and
pseudo-differential
NMC (Bits)
16
14
12
16
14
12
INL (LSB)
±2.5
±1.5
±1
±2.5
±2
±1
SNR (dB)
93 (typ)
88 (typ)
74 (typ)
89 (typ)
84 (typ)
73.5 (typ)
Copyright © 2013–2014, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Links:
ADS8354 ADS7854 ADS7254
ADS8354, ADS7854, ADS7254
SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014
www.ti.com
6 Pin Configurations and Functions
RTE Package
WQFN-16
(Top View)
AINM_A
AINP_A
AVDD
GND
PW Package
TSSOP-16
(Top View)
AINP_A
AINM_A
12
11
SDO_B
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
AVDD
GND
SDO_B
SDO_A
SCLK
CS
SDI
DVDD
16
15
14
REFIO_A
REFGND_A
REFGND_B
REFIO_B
1
2
Thermal Pad
3
4
5
6
7
8
13
REFIO_A
SDO_A
SCLK
CS
10
9
REFGND_A
REFGND_B
REFIO_B
AINM_B
AINP_B
AINM_B
AINP_B
DVDD
SDI
Pin Functions
PIN
NO.
NAME
AINM_A
AINM_B
AINP_A
AINP_B
AVDD
CS
DVDD
GND
REFGND_A
REFGND_B
REFIO_A
REFIO_B
SCLK
SDI
SDO_A
SDO_B
Thermal pad
TSSOP
2
7
1
8
16
11
9
15
4
5
3
6
12
10
13
14
—
WQFN
16
5
15
6
14
9
7
13
2
3
1
4
10
8
11
12
Thermal
pad
I/O
Analog input
Analog input
Analog input
Analog input
Supply
Digital input
Digital I/O supply
Supply
Supply
Supply
Analog input/output
Analog input/output
Digital input
Digital input
Digital output
Digital output
Supply
DESCRIPTION
Negative analog input, channel A
Negative analog input, channel B
Positive analog input, channel A
Positive analog input, channel B
Supply voltage for ADC operation
Chip-select signal; active low
Digital I/O supply
Digital ground
Reference ground potential A
Reference ground potential B
Reference voltage input/output, channel A
Reference voltage input/output, channel B
Clock for serial communication
Data input for serial communication
Data output for serial communication, channel A and channel B
Data output for serial communication, channel B
Exposed thermal pad (only for WQFN). TI recommends
connecting this pin to the printed circuit board (PCB) ground.
4
Submit Documentation Feedback
Copyright © 2013–2014, Texas Instruments Incorporated
Product Folder Links:
ADS8354 ADS7854 ADS7254
ADS8354, ADS7854, ADS7254
www.ti.com
SBAS556B – OCTOBER 2013 – REVISED AUGUST 2014
7 Specifications
7.1 Absolute Maximum Ratings
(1)
over operating free-air temperature range (unless otherwise noted)
MIN
AVDD to REFGND_x or DVDD to GND
Analog (AINP_x and AINM_x) and reference input (REFIO_x) voltage with
respect to REFGND_x
Digital input voltage with respect to GND
Ground voltage difference |REFGND_x-GND|
Input current to any pin except supply pins
Maximum virtual junction temperature, T
J
(1)
–0.3
REFGND_x – 0.3
GND – 0.3
MAX
6
AVDD + 0.3
DVDD + 0.3
0.3
±10
150
UNIT
V
V
V
V
mA
°C
Stresses beyond those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under
Recommended
Operating Conditions.
Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
7.2 Handling Ratings
MIN
T
stg
Storage temperature range
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all
pins
(1)
Charged device model (CDM), per JEDEC specification
JESD22-C101, all pins
(2)
–65
–2000
–500
MAX
150
2000
V
500
UNIT
°C
V
(ESD)
Electrostatic discharge
(1)
(2)
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
AVDD
DVDD
Analog supply voltage
Digital supply voltage
NOM
5
3.3
MAX
UNIT
V
V
7.4 Thermal Information
ADS8354, ADS7854, ADS7254
THERMAL METRIC
R
θJA
R
θJC(top)
R
θJB
ψ
JT
ψ
JB
R
θJC(bot)
(1)
Junction-to-ambient thermal resistance
Junction-to-case (top) thermal resistance
Junction-to-board thermal resistance
Junction-to-top characterization parameter
Junction-to-board characterization parameter
Junction-to-case (bottom) thermal resistance
(1)
RTE (WQFN)
16 PINS
33.3
29.5
7.3
0.2
7.4
0.9
PW (TSSOP)
16 PINS
86.9
21
39.1
0.8
38.4
N/A
UNIT
°C/W
For more information about traditional and new thermal metrics, see the
IC Package Thermal Metrics
application report,
SPRA953.
Copyright © 2013–2014, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links:
ADS8354 ADS7854 ADS7254
京公网安备 11010802033920号
EEWORLD
