Burr-Brown ADS5240IPAPG4 4-channel, 12-bit, 40msps adc with serial lvds interface Datasheet

 ADS5240
¨
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
4-Channel, 12-Bit, 40MSPS ADC
with Serial LVDS Interface
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Maximum Sample Rate: 40MSPS
12-Bit Resolution
No Missing Codes
Power Dissipation: 607mW
CMOS Technology
Simultaneous Sample-and-Hold
70.5dBFS SNR at 10MHz IF
Internal and External References
3.3V Digital/Analog Supply
Serialized LVDS Outputs
Integrated Frame and Bit Patterns
MSB and LSB First Modes
Option to Double LVDS Clock Output Currents
Pin- and Format-Compatible Family
HTQFP-64 PowerPAD™ Package
APPLICATIONS
•
•
•
•
Portable Ultrasound Systems
Tape Drives
Test Equipment
Optical Networking
An integrated phase lock loop multiplies the incoming
ADC sampling clock by a factor of 12. This 12x clock
is used in the process of serializing the data output
from each channel. The 12x clock is also used to
generate a 1x and a 6x clock, both of which are
transmitted as LVDS clock outputs. The 6x clock is
denoted by the differential pair LCLKP and LCLKN,
while the 1x clock is denoted by ADCLKP and
ADCLKN. The word output of each ADC channel can
be transmitted either as MSB or LSB first. The bit
coinciding with the rising edge of the 1x clock output
is the first bit of the word. Data is to be latched by the
receiver on both the rising and falling edges of the 6x
clock.
The ADS5240 provides internal references, or can
optionally be driven with external references. Best
performance can be achieved through the internal
reference mode.
The device is available in an HTQFP-64 PowerPAD
package and is specified over a -40°C to +85°C
operating range.
LCLK P
6X ADCLK
LCLK N
PLL
ADC LK P
1X ADCLK
ADCLK
DESCRIPTION
ADC LK N
IN1 P
The ADS5240 is a high-performance, 4-channel,
40MSPS 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.
RELATED PRODUCTS
IN1 N
S/H
IN2 P
IN2 N
S/H
IN3 P
IN3 N
S/H
IN4 P
IN4 N
MODEL
RESOLUTION
(BITS)
SAMPLE RATE
(MSPS)
CHANNELS
ADS5242(1)
12
65
4
S/H
12− Bit
ADC
Serializer
12− Bit
ADC
Serializer
12− Bit
ADC
Serializer
12− Bit
ADC
Serializer
OUT 1 N
OUT 2 P
OUT 2 N
OUT 3 P
OUT 3 N
OUT 4 P
OUT 4 N
Registers
Reference
OUT 1 P
Control
PD
RESET
SCLK
SDATA
CS
INT/EXT
REF T
VC M
REF B
(1) Available Q1 2005.
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 other 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 © 2004, Texas Instruments Incorporated
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
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)
PRODUCT
PACKAGE-LEAD
PACKAGE
DESIGNATOR
ADS5240
HTQFP-64 (2)
PAP
(1)
(2)
SPECIFIED
TEMPERATURE
RANGE
PACKAGE
MARKING
-40°C to +85°C
ADS5240I
ORDERING
NUMBER
TRANSPORT
MEDIA, QUANTITY
ADS5240IPAP
Tray, 160
ADS5240IPAPT
Tape and Reel, 1000
For the most current package and ordering information, see the Package Option Addendum located at the end of this data sheet.
Thermal pad size: 5.29mm × 5.29mm (min), 6.50mm × 6.50mm (max).
ABSOLUTE MAXIMUM RATINGS (1)
Supply Voltage Range, AVDD
-0.3V to +3.8V
Supply Voltage Range, LVDD
-0.3V to +3.8V
Voltage Between AVSS and LVSS
-0.3V to +0.3V
Voltage Between AVDD and LVDD
-0.3V to +0.3V
Voltage Applied to External REF Pins
-0.3V to +2.4V
All LVDS Data and Clock Outputs
Analog Input Pins
Peak Total Input Current (all inputs)
Junction Temperature
Operating Free-Air Temperature Range, TA
Lead Temperature, 1.6mm (1/16" from case for 10s)
(1)
2
-0.3V to +2.4V
-0.15V to +3.0V
30mA
+105°C
-40°C to +85°C
220°C
Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may
degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond
those specified is not supported.
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
RECOMMENDED OPERATING CONDITIONS
ADS5240
MIN
TYP
MAX
UNITS
Analog Supply Voltage, AVDD
3.0
3.3
3.6
V
Output Driver Supply Voltage, LVDD
3.0
3.3
3.6
V
40
MSPS
0.6
V
SUPPLIES AND REFERENCES
CLOCK INPUT AND OUTPUTS
ADCLK Input Sample Rate (low-voltage TTL)
20
Low-Level Voltage Clock Input
High-Level Voltage Clock Input
2.2
ADCLKP and ADCLKN Outputs (LVDS)
20
40
MHz
V
LCLKP and LCLKN Outputs (LVDS) (1)
120
240
MHz
Operating Free-Air Temperature, TA
-40
+85
°C
Thermal Characteristics:
(1)
θJA
24
°C/W
θJC
15
°C/W
6 × ADCLK.
REFERENCE SELECTION
MODE
Internal Reference
External Reference
INT/EXT DESCRIPTION
1
Full-scale range = 2.0VPP. Default with internal pull-up.
0
Internal reference is powered down. Common mode of external reference should be within
50mV of VCM. VCM is derived from the internal bandgap voltage.
3
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
ELECTRICAL CHARACTERISTICS
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = 40MSPS, 50% clock duty cycle,
AVDD = 3.3V, LVDD = 3.3V differential, transformer coupled inputs, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and
LDVS buffer current at 3.5mA per channel, unless otherwise noted.
ADS5240
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNITS
LSB
DC ACCURACY
No Missing Codes
Assured
DNL Differential Nonlinearity
INL Integral Nonlinearity
fIN = 5MHz
-0.9
±0.4
+0.9
fIN = 5MHz
-2.0
±0.75
+2.0
LSB
-0.75
±0.2
+0.75
%FS
Offset Error (1)
Offset Temperature Coefficient
Fixed Attenuation in
Channel (2)
ppm/°C
1
%FS
±0.2
Variable Attenuation in Channel (3)
Gain Error (4)
14
REFT - REFB
-5
Attenuation Temperature
Coefficient (5)
±1.0
%FS
+5
%FS
44
ppm/°C
VIN = FS, FIN = 5MHz
184
mA
I(AVDD) Analog Supply Current
VIN = FS, FIN = 5MHz
142
mA
I(LVDD) Digital Output Driver Supply Current
VIN = FS, FIN = 5MHz,
LVDS into 100Ω Load
42
mA
POWER SUPPLY
ICC Total Supply Current
Power Dissipation
Power-Down
607
Clock Running
650
95
mW
mW
REFERENCE VOLTAGES
VREFT Reference Top (internal)
1.95
2.0
2.05
V
VREFB Reference Bottom (internal)
0.95
1.0
1.05
V
VCM Common-Mode Voltage
1.45
1.5
1.55
VCM Output Current (6)
±50mV Change in Voltage
VREFT Reference Top (external)
±2
1.875
V
VREFB Reference Bottom (external)
1.125
External Reference Input Current (7)
V
mA
V
1.0
mA
4.0
pF
VCM ± 0.05
V
ANALOG INPUT
Differential Input Capacitance
Analog Input Common-Mode Range
Differential Input Voltage Range
Voltage Overhead Recovery Time
Input Bandwidth
1.5
2.02
VPP
Differential Input Signal at 4VPP
Recovery to Within 1% of Code
4.0
CLK Cycles
-3dBFS
300
MHz
DIGITAL DATA OUTPUTS
Data Bit Rate
(1)
(2)
(3)
(4)
(5)
(6)
(7)
4
240
480
MBPS
Offset error is the deviation of the average code from mid-code for a zero input. Offset error is expressed in terms of % of full-scale.
Fixed attenuation in the channel arises due to a fixed attenuation of about 1% in the sample-and-hold amplifier. When the differential
voltage at the analog input pins are changed from -VREF to +VREF, the swing of the output code is expected to deviate from the full-scale
code (4096LSB) by the extent of this fixed attenuation.
NOTE: VREF is defined as (REFT - REFB).
Variable attenuation in the channel refers to the attenuation of the signal in the channel over and above the fixed attenuation.
The reference voltages are trimmed at production so that (VREFT - VREFB) is within ± 50mV of the ideal value of 1V. It does not include
fixed attenuation.
The attenuation temperature coefficient refers to the temperature coefficient of the attenuation in the channel. It does not account for the
variation of the reference voltages with temperature.
VCM provides the common-mode current for the inputs of all four channels when the inputs are AC-coupled. The VCM output current
specified is the additional drive of the VCM buffer if loaded externally.
Average current drawn from the reference pins in the external reference mode.
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
AC CHARACTERISTICS
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = 40MSPS, 50% clock duty cycle,
AVDD = 3.3V, LVDD = 3.3V differential, transformer coupled inputs, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and
LVDS buffer current at 3.5mA per channel, unless otherwise noted.
ADS5240
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DYNAMIC CHARACTERISTICS
fIN = 1MHz
SFDR Spurious-Free Dynamic Range
HD2 2nd-Order Harmonic Distortion
HD3 3rd-Order Harmonic Distortion
SNR Signal-to-Noise Ratio
SINAD Signal-to-Noise and Distortion
fIN = 5MHz
85
dBc
85
dBc
fIN = 1MHz
95
dBc
95
dBc
fIN = 10MHz
90
dBc
fIN = 1MHz
87
dBc
85
dBc
fIN = 5MHz
ENOB Effective Number of Bits
Crosstalk
85
78
fIN = 10MHz
85
dBc
fIN = 1MHz
70.5
dBFS
70.5
dBFS
fIN = 10MHz
70
dBFS
fIN = 1MHz
70
dBFS
70
dBFS
69.5
dBFS
fIN = 5MHz
fIN = 5MHz
fIN = 10MHz
IMD Two-Tone Intermodulation Distortion
dBc
fIN = 10MHz
fIN = 5MHz
78
87
f1 = 9.5MHz at -7dBFS
f2 = 10.2MHz at -7dBFS
68
67
-88
dBc
fIN = 5MHz
11.3
Bits
Signal Applied to 3 Channels; Measurement Taken
on the Channel with No Input Signal
-90
dBc
5
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
LVDS DIGITAL DATA AND CLOCK OUTPUTS
Test conditions at IO = 3.5mA, RLOAD = 100Ω, and CLOAD = 6pF. IO refers to the current setting for the LVDS buffer. RLOAD is
the differential load resistance between the LVDS pair. CLOAD is the effective single-ended load capacitance between each of
the LVDS pins and ground. CLOAD includes the receiver input parasitics as well as the routing parasitics. Measurements are
done with a transmission line of 100Ω characteristic impedance between the device and the load. All LVDS specifications are
characterized, but not tested at production.
PARAMETER
DC SPECIFICATIONS
VOH
CONDITIONS
MIN
TYP
MAX UNITS
(1)
Output Voltage High, OUTP or OUTN
VOL Output Voltage Low, OUTP or OUTN
|VOD| Output Differential Voltage, |OUTP - OUTN|
VOS Output Offset
Voltage (2)
CO Output Capacitance (3)
|∆VOD| Change in |VOD| Between 0 and 1
RLOAD = 100Ω± 1%
See LVDS Timing Diagram, Page 7
1375 1500
mV
mV
RLOAD = 100Ω± 1%
900
1025
RLOAD = 100Ω± 1%
300
350
400
mV
RLOAD = 100Ω± 1%
See LVDS Timing Diagram, Page 7
1100
1200 1300
mV
VCM = 1.5V
4
pF
RLOAD = 100Ω± 1%
25
mV
∆VOS Change Between 0 and 1
RLOAD = 100Ω± 1%
25
mV
ISOUT Output Short-Circuit Current
Drivers Shorted to Ground
40
mA
Drivers Shorted Together
12
mA
ISOUTNP Output Current
DRIVER AC SPECIFICATIONS
Clock LVDS Clock Duty Cycle
6 × ADCLK (LCLKP, LCLKN)
45
Minimum Data Setup Time (4) (5)
Minimum Data Hold Time (4) (5)
tRISE/tFALL VOD Rise Time or VOD Fall Time
(1)
(2)
(3)
(4)
(5)
50
55
%
650
ps
650
ps
IO = 2.5mA
400
ps
IO = 3.5mA
250
ps
IO = 4.5mA
200
ps
IO = 6mA
150
ps
The DC specifications refer to the condition where the LVDS outputs are not switching, but are permanently at a valid logic level 0 or 1.
VOS refers to the common-mode of OUTP and OUTN.
Output capacitance inside the device, from either OUTP or OUTN to ground.
Refer to the LVDS application note (SBAA118) for a description of data setup and hold times.
Setup and hold time specifications take into account the effect of jitter on the output data and clock. These specifications also assume
that the data and clock paths are perfectly matched within the receiver. Any mismatch in these paths within the receiver would appear
as reduced timing margins.
SWITCHING CHARACTERISTICS
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = 40MSPS, 50% clock duty cycle,
AVDD = 3.3V, LVDD = 3.3V, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per
channel, unless otherwise noted.
ADS5240
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
50
ns
SWITCHING SPECIFICATIONS
tSAMPLE
tD(A) Aperture Delay
Aperture Jitter (uncertainty)
tD(pipeline) Latency
tPROP Propagation Delay
6
25
3.1
ns
1
ps rms
6.5
Cycles
5
ns
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
LVDS TIMING DIAGRAM (PER ADC CHANNEL)
Sample n
Sample n+6
Input
tSAMPLE
ADCLK
tS
2
; tS =
tSAMPLE
12
LCLKP
6X ADCLK
LCLKN
OUTP
SERIAL DATA
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D0 D1
OUTN
Sample n data
ADCLKP
1X ADCLK
ADCLKN
tD(A)
tPROP
6.5 Clock Cycles
RESET TIMING
t1
+AVDD
Power
Supply
t 1 > 10ms
t 2 > 100ns
t 3 > 100ns
0V
+AVDD
RESET
0V
t2
t3
Register Write Enable
POWER-DOWN TIMING
1µs
10µs
PD
Device Fully
Powers Down
Device Fully
Powers Up
7
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
SERIAL INTERFACE
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = maximum specified, 50% clock duty
cycle, AVDD = 3.3V, LVDD = 3.3V, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per
channel, unless otherwise noted.
ADS5240
PARAMETER
TEST CONDITIONS
MIN
TYP
SCLK Serial Clock Input Frequency
VIN LOW Input Low Voltage
0
VIN HIGH Input High Voltage
2.2
MAX
UNITS
20
MHz
0.6
V
AVDD
V
Input Current
±10
µA
Input Pin Capacitance
5.0
pF
SERIAL INTERFACE TIMING
Data is shifted in MSB first.
Outputs change on
next rising clock edge
after CS goes high.
ADCLK
Start Sequence
CS
t1
Data latched on
each rising edge of SCLK.
t2
SCLK
t3
SDATA
MSB
D6
D5
D4
D3
D2
D1
D0
t4
t5
8
PARAMETER
DESCRIPTION
MIN
t1
Serial CLK Period
50
TYP
MAX
UNIT
t2
Serial CLK High Time
25
ns
t3
Serial CLK Low Time
25
ns
t4
Minimum Data Setup Time
5
ns
t5
Minimum Data Hold Time
5
ns
ns
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
SERIAL INTERFACE REGISTERS
ADDRESS
DATA
D7
D6
D5
D4
0
0
0
0
0
0
0
0
0
0
0
DESCRIPTION
D3
D2
D1
0
0
Normal ADC Output
0
1
Deskew Pattern
1
0
Sync Pattern
1
1
D0
LVDS BUFFERS (register 0)
0
Output Current in LVDS = 3.5mA
0
1
Output Current in LVDS = 2.5mA
1
0
Output Current in LVDS = 4.5mA
1
1
Output Current in LVDS = 6.0mA
Patterns Get Reversed in MSB
First Mode of LVDS
(default after reset)
LSB/MSB MODE (register 1)
0
X
X
0
Default LVDS Clock Output Current
0
X
X
1
2X LVDS Clock Output Current
IOUT = 7.0mA
0
0
X
X
LSB First Mode
(default after reset)
0
1
X
X
0
1
(default after reset)
Custom Pattern
0
1
1
REMARKS
IOUT = 3.5mA
MSB First Mode
POWER-DOWN ADC CHANNELS
(register 2)
0
1
0
X
D2: Power-Down for Channel 2
0
X
0
1
D0: Power-Down for Channel 1
1
Logic 1 = Channel Powered
Down
POWER-DOWN ADC CHANNELS
(register 3)
1
0
X
0
D3: Power-Down for Channel 4
X
0
1
0
D1: Power-Down for Channel 3
Logic 1 = Channel Powered
Down
CUSTOM PATTERN (registers 4-6)
D3
D2
D1
D0
0
1
0
0
X
X
X
X
0
1
0
1
X
X
X
X
0
1
1
0
X
X
X
X
Bits for Custom Pattern
See Test Patterns
TEST PATTERNS (1)
Deskew
101010101010
Sync
000000111111
Custom
(1)
Any 12-bit pattern that is defined in the custom pattern registers 4 to 6. The output comes out in the following
order:
D0(4) D1(4) D2(4) D3(4) D0(5) D1(5) D2(5) D3(5) D0(6) D1(6) D2(6) D3(6)
where, for example, D0(4) refers to the D0 bit of register 4, etc.
Default is LSB first. If MSB first is selected, the above patterns will be reversed.
9
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
PIN CONFIGURATION
SCLK
SDATA
CS
AVDD
AVSS
AVSS
AVSS
ADCLK
AVDD
INT/EXT
REFT
REFB
VCM
ISET
AVSS
HTQFP
AVSS
Top View
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
AVDD
1
48 AVDD
IN1P
2
47 IN4N
IN1N
3
46 IN4P
AVSS
4
45 AVSS
AVDD
5
44 AVDD
AVSS
6
43 AVSS
IN2P
7
42 IN3N
IN2N
8
AVSS
41 IN3P
ADS5240
9
40 AVSS
AVDD 10
39 AVDD
LVSS 11
38 LVSS
37 RESET
PD 12
10
LVSS 13
36 LVSS
LVSS 14
35 LVSS
24
25
26
27
28
29
30
31
32
LVDD
LVSS
OUT4P
OUT4N
NC
NC
23
OUT3N
22
OUT3P
21
OUT2N
20
OUT2P
19
LVSS
18
LVDD
17
OUT1N
33 ADCLKP
OUT1P
LCLKN 16
NC
34 ADCLKN
NC
LCLKP 15
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
PIN DESCRIPTIONS
NAME
PIN #
I/O
DESCRIPTION
AVDD
1, 5, 10, 39, 44, 48, 55, 60
I
Analog Power Supply
IN1P
2
I
Channel 1 Differential Analog Input High
IN1N
3
I
Channel 1 Differential Analog Input Low
AVSS
4, 6, 9, 40, 43, 45, 49, 57-59, 64
I
Analog Ground
IN2P
7
I
Channel 2 Differential Analog Input High
IN2N
8
I
Channel 2 Differential Analog Input Low
LVSS
11, 13, 14, 22, 28, 35, 36, 38
I
LVDS Ground
PD
12
I
Power-Down; 0 = Normal, 1 = Power-Down
LCLKP
15
O
Positive LVDS Clock
LCLKN
16
O
Negative LVDS Clock
NC
17, 18, 31, 32
—
No Connection
OUT1P
19
O
Channel 1 Positive LVDS Data Output
OUT1N
20
O
Channel 1 Negative LVDS Data Output
LVDD
21, 27
I
LVDS Power Supply
OUT2P
23
O
Channel 2 Positive LVDS Data Output
OUT2N
24
O
Channel 2 Negative LVDS Data Output
OUT3P
25
O
Channel 3 Positive LVDS Data Output
OUT3N
26
O
Channel 3 Negative LVDS Data Output
OUT4P
29
O
Channel 4 Positive LVDS Data Output
OUT4N
30
O
Channel 4 Negative LVDS Data Output
ADCLKP
33
O
Positive LVDS ADC Clock Output
ADCLKN
34
O
Negative LVDS ADC Clock Output
RESET
37
I
Reset Registers to Default; 0 = Reset, 1 = Normal
IN3P
41
I
Channel 3 Differential Analog Input High
IN3N
42
I
Channel 3 Differential Analog Input Low
IN4P
46
I
Channel 4 Differential Analog Input High
IN4N
47
I
Channel 4 Differential Analog Input Low
ISET
50
I/O
Bias Current Setting Resistor of 56.2kΩ to Ground
VCM
51
O
Common-Mode Output Voltage
REFB
52
I/O
Reference Bottom Voltage (2Ω resistor in series with 0.1µF capacitor to ground)
Reference Top Voltage (2Ω resistor in series with 0.1µF capacitor to ground)
REFT
53
I/O
INT/EXT
54
I
Internal/External Reference Select; 0 = External, 1 = Internal
ADCLK
56
I
Data Converter Clock Input
CS
61
I
Chip-Select; 0 = Select, 1 = No Select
SDATA
62
I
Serial Data Input
SCLK
63
I
Serial Data Clock
11
ADS5240
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SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
DEFINITION OF SPECIFICATIONS
Analog Bandwidth
The analog input frequency at which the spectral
power of the fundamental frequency (as determined
by FFT analysis) is reduced by 3dB.
Aperture Delay
The delay in time between one of the edges of the
input sampling clock and the actual time at which the
sampling occurs.
Integral Nonlinearity (INL)
INL is the deviation of the transfer function from a
reference line measured in fractions of 1 LSB using a
best straight line or best fit determined by a least
square curve fit. INL is independent from effects of
offset, gain or quantization errors.
Maximum Conversion Rate
Aperture Uncertainty (Jitter)
The encode rate at which parametric testing is
performed. This is the maximum sampling rate where
certified operation is given.
The sample-to-sample variation in aperture delay.
Minimum Conversion Rate
Clock Pulse Width/Duty Cycle
This is the minimum sampling rate where the ADC
still works.
Pulse width high is the minimum amount of time that
the ENCODE pulse should be left in logic '1' state to
achieve rated performance. Pulse width low is the
minimum time that the ENCODE pulse should be left
in a low state (logic '0'). At a given clock rate, these
specifications define an acceptable clock duty cycle.
Nyquist Sampling
When the sampled frequencies of the analog input
signal are below fCLOCK/2, it is called Nyquist sampling. The Nyquist frequency is fCLOCK/2, which can
vary depending on the sample rate (fCLOCK).
Differential Nonlinearity (DNL)
Offset Error
An ideal ADC exhibits code transitions that are
exactly 1 LSB apart. DNL is the deviation of any
single LSB transition at the digital output from an
ideal 1 LSB step at the analog input. If a device
claims to have no missing codes, it means that all
possible codes (for a 12-bit converter, 4096 codes)
are present over the full operating range.
Offset error is the deviation of output code from
mid-code when both inputs are tied to common-mode.
Effective Number of Bits (ENOB)
The effective number of bits for a sine wave input at a
given input frequency can be calculated directly from
its measured SINAD using the following formula:
ENOB SINAD 1.76
6.02
If SINAD is not known, SNR can be used exceptionally to calculate ENOB (ENOBSNR).
12
Propagation Delay
This is the delay between the input clock of one of
the edges and the time when all data bits are within
valid logic levels.
Signal-to-Noise and Distortion (SINAD)
The RMS value of the sine wave fIN (input sine wave
for an ADC) to the RMS value of the noise of the
converter from DC to the Nyquist frequency, including
harmonic content. It is typically expressed in decibels
(dB). SINAD includes harmonics, but excludes DC.
Input(VS )
SINAD 20Log (10)
Noise Harmonics
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
Signal-to-Noise Ratio (without harmonics)
Temperature Drift
SNR is a measure of signal strength relative to
background noise. The ratio is usually measured in
dB. If the incoming signal strength in µV is VS and the
noise level (also in µV) is VN, then the SNR in dB is
given by the formula:
V
SNR 20Log (10) S
VN
Temperature drift (for offset error and gain error)
specifies the maximum change from the initial temperature value to the value at TMIN or TMAX.
This is the ratio of the RMS signal amplitude, VS (set
1dB below full-scale), to the RMS value of the sum of
all other spectral components, VN, excluding harmonics and DC.
Spurious-Free Dynamic Range (SFDR)
The ratio of the RMS value of the analog input sine
wave to the RMS value of the peak spur observed in
the frequency domain. It may be reported in dBc (that
is, it degrades as signal levels are lowered), or in
dBFS (always related back to converter full-scale).
The peak spurious component may or may not be a
harmonic.
Total Harmonic Distortion (THD)
THD is the ratio of the RMS signal amplitude of the
input sine wave to the RMS value of distortion
appearing at multiples (harmonics) of the input, typically given in dBc.
Two-Tone Intermodulation Distortion Rejection
The ratio of the RMS value of either input tone (f1, f2)
to the RMS value of the worst third-order
intermodulation product (2f1 - f2; 2f2 - f1). It is reported
in dBc.
13
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
TYPICAL CHARACTERISTICS
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = maximum specified, 50% clock duty
cycle, AVDD = 3.3V, LVDD = 3.3V, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per
channel, unless otherwise noted.
SPECTRAL PERFORMANCE
SPECTRAL PERFORMANCE
0
0
f IN = 1MHz (−1dBFS)
SNR = 70.9dBFS
SINAD = 70.8dBFS
SFDR = 87.1dBFS
−40
Amplitude (dB)
Amplitude (dB)
−20
−60
−80
fIN = 5MHz (−1dBFS)
SNR = 70.5dBFS
SINAD = 70.3dBFS
SFDR = 84.9dBFS
−20
−40
−60
−80
−100
−100
−120
−120
0
4
8
12
16
0
20
4
Figure 1.
SPECTRAL PERFORMANCE
20
TWO-TONE INTERMODULATION
fIN = 10MHz (−1dBFS)
SNR = 70.3dBFS
SINAD = 70.2dBFS
SFDR = 85.4dBFS
−40
−60
−80
f 1 = 9.5MHz (−7dBFS)
f1 = 10.2MHz (−7dBFS)
IMD = −88.2dBc
−20
Amplitude (dB)
Amplitude (dB)
16
0
−20
−40
−60
−80
−100
−100
−120
−120
0
4
8
12
16
0
20
4
Figure 3.
16
20
INTEGRAL NONLINEARITY ERROR
2.0
fIN = 5MHz
0.8
12
Figure 4.
DIFFERENTIAL NONLINEARITY ERROR
1.0
8
Input Frequency (MHz)
Input Frequency (MHz)
fIN = 5MHz
1.5
0.6
1.0
0.4
INL Error (LSBs)
DNL Error (LSB)
12
Figure 2.
0
0.2
0
−0.2
−0.4
−0.6
0.5
0
−0.5
−1.0
−1.5
−0.8
−2.0
−1.0
0
14
8
Input Frequency (MHz)
Input Frequency (MHz)
512
1024
1536
2048
2560
3072
3584
4096
0
512
1024
1536
2048
2560
Code
Code
Figure 5.
Figure 6.
3072
3584
4096
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
TYPICAL CHARACTERISTICS (continued)
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = maximum specified, 50% clock duty
cycle, AVDD = 3.3V, LVDD = 3.3V, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per
channel, unless otherwise noted.
SWEPT INPUT POWER
SWEPT INPUT POWER
100
100
fIN = 5MHz
90
80
80
SNR (dBFS)
70
60
SNR (dBc, dBFS)
SNR (dBc, dBFS)
f IN = 10MHz
90
SFDR (dBc)
50
40
SNR (dBc)
30
60
50
SFDR (dBc)
40
SNR (dBc)
30
20
20
10
10
0
SNR (dBFS)
70
0
−70
−60
−50
−40
−30
−20
−10
−70
0
−40
−30
−20
Figure 7.
Figure 8.
IAVDD, IDVDD vs SAMPLE RATE
−10
0
DYNAMIC PERFORMANCE vs SAMPLE RATE
90
fIN = 5MHz
fIN = 5MHz
SFDR, SNR, SINAD (dBFS)
0.25
IAVDD, IDVDD (A)
−50
Input Amplitude (A)
0.30
0.20
0.15
IAVDD
0.10
0.05
IDVDD
0
SFDR
85
80
SNR
75
70
65
SINAD
60
55
20
25
30
35
40
45
20
25
30
35
40
Sample Rate (MSPS)
Sample Rate (MSPS)
Figure 9.
Figure 10.
DYNAMIC PERFORMANCE vs SAMPLE RATE
45
POWER DISSIPATION vs TEMPERATURE
620
90
f IN = 10MHz
618
85
616
SFDR
80
614
Power (mW)
SFDR, SNR, SINAD (dBFS)
−60
Input Amplitude (A)
75
SNR
70
SINAD
612
610
608
606
65
604
60
602
55
600
20
25
30
35
Sample Rate (MSPS)
Figure 11.
40
45
−40
−20
0
20
40
60
80
Temperature ( C)
Figure 12.
15
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
TYPICAL CHARACTERISTICS (continued)
TMIN = -40°C and TMAX = +85°C. Typical values are at TA = 25°C, clock frequency = maximum specified, 50% clock duty
cycle, AVDD = 3.3V, LVDD = 3.3V, -1dBFS, ISET = 56.2kΩ, internal voltage reference, and LVDS buffer current at 3.5mA per
channel, unless otherwise noted.
OUTPUT NOISE HISTOGRAM
120k
100k
Counts
80k
60k
40k
20k
0k
N−2
N− 1
N
Code
Figure 13.
16
N+1
N+2
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
THEORY OF OPERATION
OVERVIEW
DRIVING THE ANALOG INPUTS
The ADS5240 is a 4-channel, high-speed, CMOS
ADC.
It
consists
of
a
high-performance
sample-and-hold circuit at the input, followed by a
12-bit ADC. The 12 bits given out by each channel
are serialized and sent out on a single pair of pins in
LVDS format. All four channels of the ADS5240
operate from a single clock referred to as ADCLK.
The sampling clocks for each of the four channels are
generated from the input clock using a carefully
matched clock buffer tree. The 12x clock required for
the serializer is generated internally from ADCLK
using a phase lock loop (PLL). A 6x and a 1x clock
are also output in LVDS format along with the data to
enable easy data capture. The ADS5240 operates
from internally-generated reference voltages that are
trimmed to improve matching across multiple devices
on a board. This feature eliminates the need for
external routing of reference lines and also improves
matching of the gain across devices. The nominal
values of REFT and REFB are 2V and 1V, respectively. These values imply that a differential input of
-1V corresponds to the zero code of the ADC, and a
differential input of +1V corresponds to the full-scale
code (4095 LSB). VCM (common-mode voltage of
REFT and REFB) is also made available externally
through a pin, and is nominally 1.5V.
The analog input biasing is shown in Figure 14. The
recommended method to drive the inputs is through
AC coupling. AC coupling removes the worry of
setting the common-mode of the driving circuit, since
the inputs are biased internally using two 600Ω
resistors.
The ADC employs a pipelined converter architecture
consisting of a combination of multi-bit and single-bit
internal stages. Each stage feeds its data into the
digital error correction logic, ensuring excellent differential linearity and no missing codes at the 12-bit
level. The pipeline architecture results in a data
latency of 6.5 clock cycles.
The output of the ADC goes to a serializer that
operates from a 12x clock generated by the PLL. The
12 data bits from each channel are serialized and
sent LSB first. In addition to serializing the data, the
serializer also generates a 1x clock and a 6x clock.
These clocks are generated in the same way the
serialized data is generated, so these clocks maintain
perfect synchronization with the data. The data and
clock outputs of the serializer are buffered externally
using LVDS buffers. Using LVDS buffers to transmit
data externally has multiple advantages, such as
reduced number of output pins (saving routing space
on the board), reduced power consumption, and
reduced effects of digital noise coupling to the analog
circuit inside the ADS5240.
The ADS5240 operates from two sets of supplies and
grounds. The analog supply/ground set is denoted as
AVDD/AVSS, while the digital set is denoted by
LVDD/LVSS.
ADS5240
IN+
600Ω
Input
Circuitry
600Ω
IN−
VCM
CM Buffer
Internal
Voltage
Reference
Figure 14. Analog Input Bias Circuitry
The sampling capacitor used to sample the inputs is
4pF. The choice of the external AC coupling capacitor
is dictated by the attenuation at the lowest desired
input frequency of operation. The attenuation resulting from using a 10nF AC coupling capacitor is
0.04%.
If the input is DC-coupled, then the output common-mode voltage of the circuit driving the ADS5240
should match the VCM (which is provided as an output
pin) to within ±50mV. It is recommended that the
output common-mode of the driving circuit be derived
from VCM provided by the device.
The sampling circuit consists of a low-pass RC filter
at the input to filter out noise components that might
be differentially coupled on the input pins. The inputs
are sampled on two 4pF capacitors, see Figure 15.
The sampling on the capacitors is done with respect
to an internally-generated common-mode voltage
(INCM). The switches connecting the sampling capacitors to the INCM are opened out first (before the
switches connecting them to the analog inputs). This
ensures that the charge injection arising out of the
switches opening is independent of the input signal
amplitude to a first-order of approximation. SP refers
to a sampling clock whose falling edge comes an
instant before the SAMPLE clock. The falling edge of
SP determines the sampling instant.
17
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
INCM
(internally−generated voltage)
15Ω
IN+
1.5pF
Sample
4pF
SP
(defines sampling instant)
1.7pF
SP
4pF
15Ω
IN−
1.5pF
Sample
SP
thereby scales down the device operating power.
However, it is recommended that the external resistor
be within 10% of the specified value of 56.2kΩ so
that the internal bias margins for the various blocks
are proper.
Buffering the internal bandgap voltage also generates
a voltage called VCM, which is set to the midlevel of
REFT and REFB, and is accessible on a pin. The
internal buffer driving VCM has a drive of ±2mA. It is
meant as a reference voltage to derive the input
common-mode in case the input is directly coupled.
When using the internal reference mode, a resistor of
2Ω should be added between the reference pins
(REFT and REFB) and the decoupling capacitor, as
shown in Figure 16.
INCM
ADS5240
ISET
Figure 15. Input Circuitry
REFT
INPUT OVER-VOLTAGE RECOVERY
The differential full-scale input peak-to-peak supported by the ADS5240 is 2V. For a nominal value of
VCM (1.5V), INP and INN can swing from 1V to 2V.
The ADS5240 is specially designed to handle an
over-voltage differential peak-to-peak voltage of 4V
(2.5V and 0.5V swings on INP and INN). If the input
common-mode is not considerably off from VCM
during overload (less than 300mV), recovery from an
over-voltage input condition is expected to be within 4
clock cycles. All of the amplifiers in the SHA and ADC
are specially designed for excellent recovery from an
overload signal.
REFERENCE CIRCUIT DESIGN
The digital beam-forming algorithm relies on gain
matching across all receiver channels. (A typical
system would have about 128 ADCs on the board.) In
such a case, it is critical to ensure that the gain is
matched, essentially requiring the reference voltages
seen by all the ADCs to be the same. Matching
references within the four channels of a chip is done
by using a single internal reference voltage buffer.
Trimming the reference voltages on each chip during
production ensures the reference voltages are
well-matched across different chips.
All bias currents required for the internal operation of
the device are set using an external resistor to
ground at pin ISET. Using a 56.2kΩ resistor on ISET
generates an internal reference current of 20µA. This
current is mirrored internally to generate the bias
current for the internal blocks. Using a larger external
resistor at ISET reduces the reference bias current and
18
VCM
REFB
2Ω
0.1µF
+
2.2µF
56.2kΩ
2Ω
+
2.2µF
0.1µF
Figure 16. Internal Reference Mode
The device also supports the use of external reference voltages. This mode involves forcing REFT and
REFB externally. In this mode, the internal reference
buffer is tri-stated. Since the switching current for the
four ADCs come from the externally-forced references, it is possible for the performance to be slightly
less than when the internal references are used. It
should be noted that in this mode, VCM and ISET
continue to be generated from the internal bandgap
voltage, as in the internal reference mode. It is
therefore important to ensure that the common-mode
voltage of the externally-forced reference voltages
matches to within 50mV of VCM.
CLOCKING
The four channels on the chip run off a single ADCLK
input. To ensure that the aperture delay and jitter are
same for all the channels, a clock tree network is
used to generate individual sampling clocks to each
channel. The clock paths for all the channels are
matched from the source point all the way to the
sample-and-hold. This ensures that the performance
and timing for all the channels are identical. The use
ADS5240
www.ti.com
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
of the clock tree for matching introduces an aperture
delay, which is defined as the delay between the
rising edge of ADCLK and the actual instant of
sampling. The aperture delays for all the channels
are matched. The aperture delays for all channels are
matched. However, across conditions of temperature,
supply voltage, and devices, the aperture delay
averages 3.1ns.
The input ADCLK should ideally have a 50% duty
cycle. However, while routing ADCLK to different
components on board, the duty cycle of the ADCLK
reaching the ADS5240 could deviate from 50%. A
smaller (or larger) duty cycle eats into the time
available for sample or hold phases of each circuit,
and is therefore not optimal. For this reason, the
internal PLL is used to generate an internal clock that
has 50% duty cycle.
The use of the PLL automatically dictates the minimum sampling rate to be about 20MSPS.
LVDS BUFFERS
The LVDS buffer has two current sources, as shown
in Figure 17. OUTP and OUTN are loaded externally
by a resistive load that is ideally about 100Ω.
Depending on the data being 0 or 1, the currents are
directed in one or the other direction through the
resistor. While the lower side current source is a
constant current source, the higher side current
source is controlled through a feedback loop to
maintain the output common mode constant. The
LVDS buffer has four current settings. The default
current setting is 3.5mA, and gives a differential drop
of about ±350mV across the 100Ω resistor.
High
External
Termination
Resistor
Low
OUTP
OUTN
Low
High
Figure 17. LVDS Buffer
The LVDS buffer gets data from a serializer that
takes the output data from each channel and
serializes it into a single data stream. For a clock
frequency of 40MHz, the data rate output by the
serializer is 480MBPS. The data comes out LSB first,
with a register programmability to revert to MSB first.
The serializer also gives out a 1x clock and a 6x
clock. The 6x clock (denoted as LCLKP/LCLKN) is
meant to synchronize the capture of the LVDS data.
The deskew mode can be enabled as well, using a
register setting. This mode gives out a data stream of
alternate 0s and 1s and can be used determine the
relative delay between the 6x clock and the output
data for optimum capture. A 1x clock is also generated by the serializer and transmitted by the LVDS
buffer. The 1x clock (referred to as ADCLKP/ADCLKN)
is used to determine the start of the 12-bit data
frame. The sync mode (enabled through a register
setting) gives out a data of six 0s followed by six 1s.
Using this mode, the 1x clock can be used to
determine the start of the data frame. In addition to
the deskew mode pattern and the sync pattern, a
custom pattern can be defined by the user and output
from the LVDS buffer.
NOISE COUPLING ISSUES
High-speed mixed signals are sensitive to various
types of noise coupling. One of the main sources of
noise is the switching noise from the serializer and
the output buffers. Maximum care is taken to isolate
these noise sources from the sensitive analog blocks.
As a starting point, the analog and digital domains of
the chip are clearly demarcated. AVDD and AVSS
are used to denote the supplies for the analog
sections, while LVDD and LVSS are used to denote
the digital supplies. Care is taken to ensure that there
is minimal interaction between the supply sets within
the device. The extent of noise coupled and
transmitted from the digital to the analog sections
depends on the following:
1. The effective inductances of each of the
supply/ground sets.
2. The isolation between the digital and analog
supply/ground sets.
Smaller effective inductance of the supply/ground
pins leads to better suppression of the noise. For this
reason, multiple pins are used to drive each
supply/ground. It is also critical to ensure that the
impedances of the supply and ground lines on board
are kept to the minimum possible values. Use of
ground planes in the board as well as large decoupling capacitors between the supply and ground lines
are necessary to get the best possible SNR from the
device.
19
ADS5240
SBAS326C – JUNE 2004 – REVISED DECEMBER 2004
It is recommended that the isolation be maintained
onboard by using separate supplies to drive AVDD
and LVDD, as well as separate ground planes for
AVSS and LVSS.
The use of LVDS buffers reduces the injected noise
considerably, compared to CMOS buffers. The current in the LVDS buffer is independent of the direction
of switching. Also, the low output swing as well as the
differential nature of the LVDS buffer results in
low-noise coupling.
POWER-DOWN MODE
The ADS5240 has a power-down pin, PD. Pulling PD
high causes the device to enter the power-down
mode. In this mode, the reference and clock circuitry
as well as all the channels are powered down. Device
power consumption drops to less than 100mW in this
mode. Individual channels can also be selectively
powered down by programming registers.
The ADS5240 also has an internal circuit that monitors the state of stopped clocks. If ADCLK is stopped
(or if it runs at a speed < 3MHz), this monitoring
circuit generates a logic signal that puts the device in
a power-down state. As a result, the power consumption of the device is reduced when ADCLK is
stopped. This circuit can also be disabled using
register options.
SUPPLY SEQUENCE
The following supply sequence is recommended for
powering up the device:
1. AVDD is powered up.
2. LVDD is powered up.
During the power-up ramp, the AVDD and LVDD
supplies should track each other to within 0.6V.
20
www.ti.com
If this sequencing is not possible, then it is recommended that AVDD and LVDD be powered up
simultaneously.
After the supplies have stabilized, it is required to
give the device an active RESET pulse. This results
in all internal registers getting reset to their default
value of 0 (inactive). Without RESET, it is possible
that some registers might be in their non-default state
on power-up. This could cause the device to
malfunction.
LAYOUT OF PCB WITH PowerPAD
THERMALLY-ENHANCED PACKAGES
The ADS5240 is housed in an 64-lead PowerPAD
thermally-enhanced package. To make optimum use
of the thermal efficiencies designed into the
PowerPAD package, the printed circuit board (PCB)
must be designed with this technology in mind.
Please refer to PowerPAD brief SLMA004 PowerPAD
Made Easy (refer to our web site at www.ti.com),
which addresses the specific considerations required
when integrating a PowerPAD package into a PCB
design. For more detailed information, including thermal modeling and repair procedures, please see
technical
brief
SLMA002,
PowerPAD
Thermally-Enhanced Package (available for download at
www.ti.com).
CONNECTING HIGH-SPEED,
MULTI-CHANNEL ADCs TO XILINX FPGAs
A separate application note (XAPP774) describing
how to connect TI's high-speed, multi-channel ADCs
with serial LVDS outputs to XILINX FPGAs can be
downloaded directly from the XILINX website
(http://www.xilinx.com).
THERMAL PAD MECHANICAL DATA
www.ti.com
PAP (S-PQFP-G64)
THERMAL INFORMATION
This PowerPAD™ package incorporates an exposed thermal pad that is designed to be attached directly to an
external heatsink. When the thermal pad is soldered directly to the printed circuit board (PCB), the PCB can be
used as a heatsink. In addition, through the use of thermal vias, the thermal pad can be attached directly to a
ground plane or special heatsink structure designed into the PCB. This design optimizes the heat transfer from
the integrated circuit (IC).
For additional information on the PowerPAD package and how to take advantage of its heat dissipating abilities,
refer to Technical Brief, PowerPAD Thermally Enhanced Package, Texas Instruments Literature No. SLMA002
and Application Brief, PowerPAD Made Easy, Texas Instruments Literature No. SLMA004. Both documents are
available at www.ti.com.
The exposed thermal pad dimensions for this package are shown in the following illustration.
48
33
49
32
Exposed Thermal Pad
6,50
5,29
64
17
1
16
6,50
5,29
Top View
NOTE: All linear dimensions are in millimeters
PPTD012
Exposed Thermal Pad Dimensions
PowerPAD is a trademark of Texas Instruments
PACKAGE OPTION ADDENDUM
www.ti.com
12-May-2005
PACKAGING INFORMATION
Orderable Device
Status (1)
Package
Type
Package
Drawing
Pins Package Eco Plan (2)
Qty
ADS5240IPAP
ACTIVE
HTQFP
PAP
64
160
ADS5240IPAPG4
ACTIVE
HTQFP
PAP
64
160
TBD
Call TI
ADS5240IPAPT
ACTIVE
HTQFP
PAP
64
250
Green (RoHS &
no Sb/Br)
CU NIPDAU
ADS5240IPAPTG4
ACTIVE
HTQFP
PAP
64
250
TBD
Call TI
Green (RoHS &
no Sb/Br)
Lead/Ball Finish
CU NIPDAU
MSL Peak Temp (3)
Level-3-260C-168 HR
Call TI
Level-3-260C-168 HR
Call TI
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3)
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
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Addendum-Page 1
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