Ultralow-Power ADC. ADS4128 Datasheet

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ADS4128 Datasheet
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Part ADS4128
Description Ultralow-Power ADC
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Texas Instruments ADS4128
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
ADS4128
SBAS578A – MAY 2012 – REVISED JANUARY 2016
ADS4128 12-Bit, 200-MSPS, Ultralow-Power ADC
1 Features
1 Maximum Sample Rate: 200 MSPS
• Ultralow Power with 1.8-V Single Supply:
– 230-mW Total Power at 200 MSPS
• High Dynamic Performance:
– SNR: 69 dBFS at 170 MHz
– SFDR: 85 dBc at 170 MHz
• Dynamic Power Scaling With Sample Rate
• Output Interface:
– Double Data Rate (DDR) LVDS with
Programmable Swing and Strength
– Standard Swing: 350 mV
– Low Swing: 200 mV
– Default Strength: 100-Ω Termination
– 2× Strength: 50-Ω Termination
– 1.8-V Parallel CMOS Interface Also Supported
• Programmable Gain up to 6 dB for SNR and
SFDR Trade-Off
• DC Offset Correction
• Supports Low Input Clock Amplitude Down to 200
mVPP
• Package: 7.00 mm × 7.00 mm VQFN-48
2 Applications
• Wireless Communications Infrastructure
• Software-Defined Radio
• Power Amplifier Linearization
3 Description
The ADS4128 is a 12-bit analog-to-digital converter
(ADC) with sampling rates up to 200 MSPS. This
device uses innovative design techniques to achieve
high dynamic performance, while consuming
extremely low power at 1.8-V supply. The device is
well-suited for multi-carrier, wide-bandwidth
communications applications.
The ADS4128 has fine-gain options that can be used
to improve SFDR performance at lower full-scale
input ranges, especially at high input frequencies. It
includes a dc offset correction loop that can be used
to cancel the ADC offset. At lower sampling rates, the
ADC automatically operates at scaled-down power
with no loss in performance.
The ADS4128 is available in a compact VQFN-48
package and is specified over the industrial
temperature range (–40°C to 85°C).
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
ADS4128
VQFN(48)
7.00 mm × 7.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
ADS4128 Block Diagram
ADS4128
VCM
INP
INM
CLKP
CLKM
Reference
Sampling
Circuit
12-bit ADC
CLK
Gen
LVDS
D0_D1P
D0_D1M
D10_D11P
D10_D11M
CLKOUTP
CLKOUTM
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.



Texas Instruments ADS4128
ADS4128
SBAS578A – MAY 2012 – REVISED JANUARY 2016
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Device Comparison Table..................................... 3
6 Pin Configuration and Functions ......................... 4
7 Specifications......................................................... 7
7.1 Absolute Maximum Ratings ...................................... 7
7.2 ESD Ratings.............................................................. 7
7.3 Recommended Operating Conditions....................... 7
7.4 Thermal Information .................................................. 8
7.5 Electrical Characteristics........................................... 9
7.6 Electrical Characteristics: General .......................... 10
7.7 Digital Characteristics ............................................. 11
7.8 Timing Requirements: LVDS and CMOS Modes.... 12
7.9 Reset Timing Requirements ................................... 13
7.10 Typical Characteristics .......................................... 18
7.11 Typical Characteristics: Contour ........................... 22
8 Detailed Description ............................................ 23
8.1 Overview ................................................................. 23
8.2 Functional Block Diagram ....................................... 23
8.3 Feature Description................................................. 24
8.4 Device Functional Modes........................................ 27
8.5 Programming .......................................................... 31
8.6 Register Maps ........................................................ 32
9 Application and Implementation ........................ 39
9.1 Application Information............................................ 39
9.2 Typical Application ................................................. 43
10 Power Supply Recommendations ..................... 45
10.1 Sharing DRVDD and AVDD Supplies ................... 45
10.2 Using DC/DC Power Supplies .............................. 45
10.3 Power Supply Bypassing ...................................... 45
11 Layout................................................................... 46
11.1 Layout Guidelines ................................................. 46
11.2 Layout Example .................................................... 46
12 Device and Documentation Support ................. 47
12.1 Device Support .................................................... 47
12.2 Documentation Support ........................................ 48
12.3 Community Resources.......................................... 49
12.4 Trademarks ........................................................... 49
12.5 Electrostatic Discharge Caution ............................ 49
12.6 Glossary ................................................................ 49
13 Mechanical, Packaging, and Orderable
Information ........................................................... 49
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Original (May 2012) to Revision A
Page
• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
2 Submit Documentation Feedback
Product Folder Links: ADS4128
Copyright © 2012–2016, Texas Instruments Incorporated



Texas Instruments ADS4128
ADS4128
www.ti.com
5 Device Comparison Table
FAMILY
ADS412x
12-bit family
ADS414x
14-bit family
9-bit
11-bit
65 MSPS
ADS4122
ADS4142
SAMPLING RATE
125 MSPS
160 MSPS
200 MSPS
ADS4125
ADS4126
ADS4128
ADS4145
ADS4146
SBAS578A – MAY 2012 – REVISED JANUARY 2016
250 MSPS
ADS4129
ADS4149
WITH ANALOG INPUT
BUFFERS
200 MSPS
250 MSPS
ADS41B29
ADS58B18
ADS41B49
ADS58B19
Copyright © 2012–2016, Texas Instruments Incorporated
Product Folder Links: ADS4128
Submit Documentation Feedback
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