ADS5277 Datasheet, PDF (1/28 Pages) Texas Instruments – 8-Channel, 10-Bit, 65MSPS Analog-to-Digital Converter with Serial LVDS Interface

BurrĆBrown Products
from Texas Instruments
ADS5277
SBAS333C – FEBRUARY 2005 – REVISED SEPTEMBER 2005
8-Channel, 10-Bit, 65MSPS Analog-to-Digital Converter
with Serial LVDS Interface
FEATURES
• Maximum Sample Rate: 65MSPS
• 10-Bit Resolution
• No Missing Codes
• Total Power Dissipation:
Internal Reference: 911mW
External Reference: 845mW
• CMOS Technology
• Simultaneous Sample-and-Hold
• 61.7dBFS SNR at 5MHz IF
• 3.3V Digital/Analog Supply
• Serialized LVDS Outputs
• Integrated Frame and Bit Patterns
• Option to Double LVDS Clock Output Currents
• Four Current Modes for LVDS
• Pin- and Format-Compatible Family
• TQFP-80 PowerPAD™ Package
APPLICATIONS
• Portable Ultrasound Systems
• Tape Drives
• Test Equipment
DESCRIPTION
The ADS5277 is a high-performance, CMOS,
65MSPS, 8-channel analog-to-digital converter
(ADC). Internal references are provided, simplifying
system design requirements. Low power consumption
allows for the highest of system integration densities.
Serial LVDS (low-voltage differential signaling)
outputs reduce the number of interface lines and
package size.
MODEL
ADS5270
ADS5271
ADS5272
ADS5273
RELATED PRODUCTS
RESOLUTION
(BITS)
12
12
12
12
SAMPLE RATE
(MSPS)
40
50
65
70
CHANNELS
8
8
8
8
An integrated phase lock loop (PLL) multiplies the
incoming ADC sampling clock by a factor of 12. This
high-frequency clock is used in the data serialization
and transmission process. The word output of each
internal ADC is serialized and transmitted either MSB
or LSB first. The word consists of 12 bits, of which
the 2 LSBs are zeroes and the remaining 10 bits
correspond to the output from the ADC. This
formatting is done in order to keep the interface
compatible with the 12-bit parts of the family. In
addition to the eight data outputs, a bit clock and a
word clock are also transmitted. The bit clock is at 6x
the speed of the sampling clock, whereas the word
clock is at the same speed of the sampling clock.
The ADS5277 provides internal references, or can
optionally be driven with external references. Best
performance is achieved through the internal
reference mode.
The ADS5277 is available in a PowerPAD TQFP-80
package and is specified over a –40°C to +85°C
operating range.
ADCLK
6x ADCLK
12x ADCLK
PLL
1x ADCLK
I N1 _P
S/H
IN1_N
I N2 _P
S/H
IN2_N
I N3 _P
S/H
IN3_N
I N4 P
S/H
IN4N
I N5 _P
S/H
IN5N
I N6 _P
S/H
IN6_N
I N7 _P
S/H
IN7_N
I N8 _P
S/H
IN8_N
10−Bit
ADC
10−Bit
ADC
10−Bit
ADC
10−Bit
ADC
10−Bit
ADC
10−Bit
ADC
10−Bit
ADC
10−Bit
ADC
Se riali ze r
Se riali ze r
Se riali ze r
Se riali ze r
Se riali ze r
Se riali ze r
Se riali ze r
Se riali ze r
Reference
Registers
Control
I NT /E X T
LCLK_P
LCLK_N
ADCLK_P
ADCLK_N
OUT1P
OUT1N
OUT2_P
OUT2_N
OUT3_P
OUT3_N
OUT4_P
OUT4_N
OUT5P
OUT5N
OUT6_P
OUT6N
OUT7_P
OUT7_N
OUT8_P
OUT8_N
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.
All trademarks are the property of their respective owners.
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 © 2005, Texas Instruments Incorporated