designed for digitizing high frequency, wide dynamic range
signals. They are perfect for demanding communications
applications with AC performance that includes 68.5dB
SNR and 90dB spurious free dynamic range (SFDR). The
1.25GHz input bandwidth allows the ADC to achieve high
undersampling ratio with very low attenuation. The latency
is only six clock cycles.
DC specs include ±0.26LSB INL (typ), ±0.16LSB DNL (typ)
and no missing codes over temperature. The transition
noise is 0.54LSB
RMS
.
The digital outputs are double data rate (DDR) LVDS.
The ENC
+
and ENC
–
inputs can be driven differentially with
a sine wave, PECL, LVDS, TTL, or CMOS inputs. An optional
clock duty cycle stabilizer allows high performance at full
speed for a wide range of clock duty cycles.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
68.5dB SNR
90dB SFDR
Low Power: 628mW/592mW/545mW Total
Single 1.8V Supply
DDR LVDS Outputs
Easy-to-Drive 1.5V
P-P
Input Range
1.25GHz Full-Power Bandwidth S/H
Optional Clock Duty Cycle Stabilizer
Low Power Sleep and Nap Modes
Serial SPI Port for Configuration
Pin Compatible 14-Bit Versions
64-Lead (9mm × 9mm) QFN Package
APPLICATIONS
n
n
n
n
n
n
Communications
Cellular Basestations
Software Defined Radios
Medical Imaging
High Definition Video
Testing and Measurement Instruments
TYPICAL APPLICATION
V
DD
CHANNEL A
ANALOG
INPUT
12-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
OUTPUT
DRIVERS
OV
DD
DA10_11
•
•
•
DA0_1
LTC2157-12: 32K Points 2-Tone FFT,
f
IN
= 71MHZ and 69MHz, 250Msps
DDR
LVDS
0
–20
AMPLITUDE (dBFS)
DDR
LVDS
–40
–60
–80
S/H
CLOCK
CLOCK/DUTY
CYCLE
CONTROL
OGND
CHANNEL B
OV
DD
ANALOG
INPUT
S/H
12-BIT
PIPELINED
ADC CORE
GND
CORRECTION
LOGIC
OUTPUT
DRIVERS
DB10_11
•
•
•
DB0_1
–100
–120
0
20
40
60
80
100
FREQUENCY (MHz)
120
21576512 TA01
OGND
21576512 G11
21576512fb
For more information
www.linear.com/LTC2157-12
1
LTC2157-12/
LTC2156-12/LTC2155-12
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
V
DD
PAR/SER
CS
SCK
SDI
SDO
GND
DA10_11
+
DA10_11
–
DA8_9
+
DA8_9
–
DA6_7
+
DA6_7
–
DA4_5
+
DA4_5
–
OV
DD
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
Supply Voltage
V
DD
, OV
DD
................................................ –0.3V to 2V
Analog Input Voltage
A
INA/B+
, A
INA/B –
, PAR/SER,
SENSE (Note 3)........................ –0.3V to (V
DD
+ 0.2V)
Digital Input Voltage
ENC
+
, ENC
–
(Note 3) ................ –0.3V to (V
DD
+ 0.3V)
CS,
SDI, SCK (Note 4) ........................... –0.3V to 3.9V
SDO (Note 4)............................................. –0.3V to 3.9V
Digital Output Voltage ................ –0.3V to (OV
DD
+ 0.3V)
Operating Temperature Range
LTC2157C, LTC2156C, LTC2155C ............ 0°C to 70°C
LTC2157I, LTC2156I, LTC2155I ............–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
V
DD
1
V
DD
2
GND 3
A
INA+
4
A
INA–
5
GND 6
SENSE 7
V
REF
8
GND 9
V
CM
10
GND 11
A
INB–
12
A
INB+
13
GND 14
V
DD
15
V
DD
16
65
GND
OGND
DA2_3
+
DA2_3
–
DA0_1
+
DA0_1
–
NC
NC
CLKOUT
+
CLKOUT
–
DB10_11
+
DB10_11
–
DB8_9
+
DB8_9
–
DB6_7
+
DB6_7
–
OGND
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 20°C/W
EXPOSED PAD (PIN 65) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2157CUP-12#PBF
LTC2157IUP-12#PBF
LTC2156CUP-12#PBF
LTC2156IUP-12#PBF
LTC2155CUP-12#PBF
LTC2155IUP-12#PBF
TAPE AND REEL
LTC2157CUP-12#TRPBF
LTC2157IUP-12#TRPBF
LTC2156CUP-12#TRPBF
LTC2156IUP-12#TRPBF
LTC2155CUP-12#TRPBF
LTC2155IUP-12#TRPBF
PART MARKING*
LTC2157UP-12
LTC2157UP-12
LTC2156UP-12
LTC2156UP-12
LTC2155UP-12
LTC2155UP-12
PACKAGE DESCRIPTION
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
64-Lead (9mm × 9mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
V
DD
GND
ENC
+
ENC
–
GND
OF
–
OF
+
NC
NC
DB0_1
–
DB0_1
+
DB2_3
–
DB2_3
+
DB4_5
–
DB4_5
+
OV
DD
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
21576512fb
2
For more information
www.linear.com/LTC2157-12
LTC2157-12/
LTC2156-12/LTC2155-12
CONVERTER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
l
PARAMETER
Resolution (No Missing Codes)
Integral Linearity Error
Differential Linearity Error
Offset Error
Gain Error
Offset Drift
Full-Scale Drift
Transition Noise
LTC2157-12
MIN
TYP MAX
12
–2.3
–0.6
–13
–4
±0.26
±0.16
±5
±1
±20
±30
±10
0.54
2.3
0.8
13
2.2
LTC2156-12
MIN
TYP MAX
12
–2.2
–0.6
–13
–4
±0.30
±0.16
±5
±1
±20
±30
±10
0.54
2.2
0.6
13
2.2
LTC2155-12
MIN
TYP MAX
12
–1.9
–0.6
–13
–4
±0.30
±0.16
±5
±1
±20
±30
±10
0.54
1.9
0.6
13
2.2
UNITS
Bits
LSB
LSB
mV
%FS
µV/°C
ppm/°C
ppm/°C
LSB
RMS
Differential Analog Input (Note 6)
l
Differential Analog Input
(Note 7)
External Reference
Internal Reference
External Reference
l
l
l
ANALOG INPUT
SYMBOL PARAMETER
V
IN
V
IN(CM)
V
SENSE
I
IN1
I
IN2
I
IN3
t
AP
t
JITTER
CMRR
BW-3B
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
1.7V < V
DD
< 1.9V
Differential Analog Input (Note 8)
0 < A
IN+
, A
IN–
< V
DD
, No Encode
0 < PAR/SER < V
DD
1.2V < SENSE < 1.3V
l
l
l
l
l
l
MIN
V
CM
– 20mV
1.200
–1
–1
–1
TYP
1.5
V
CM
1.250
MAX
V
CM
+ 20mV
1.300
1
1
1
UNITS
V
P-P
V
V
µA
µA
µA
ns
ps
RMS
dB
MHz
Analog Input Range (A
IN+
– A
IN–
)
Analog Input Common Mode (A
IN+
+ A
IN–
)/2
Analog Input Leakage Current
PAR/SER Input Leakage Current
SENSE Input Leakage Current
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Jitter
Analog Input Common Mode Rejection Ratio
Full-Power Bandwidth
External Voltage Reference Applied to SENSE External Reference Mode
1
0.15
75
1250
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 5)
SYMBOL
SNR
PARAMETER
Signal-to-Noise Ratio
CONDITIONS
15MHz Input
70MHz Input
140MHz Input
LTC2157-12
MIN
TYP MAX
68.5
68.4
68.0
90.6
88
80
98
95
85
68.4
68.3
67.7
–95
LTC2156-12
MIN
TYP MAX
68.5
68.3
67.9
90.1
89
81
98
95
87
68.4
68.3
67.7
–95
LTC2155-12
MIN
TYP MAX
68.5
68.3
67.8
90
88
80
98
95
88
68.4
68.3
67.7
–95
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dB
DYNAMIC ACCURACY
l
66.9
67.3
67.4
SFDR
Spurious Free Dynamic Range 15MHz Input
2nd or 3rd Harmonic
70MHz Input
140MHz Input
Spurious Free Dynamic Range 15MHz Input
4th Harmonic or Higher
70MHz Input
140MHz Input
l
71
74
75
l
81
82
83
S/(N+D)
Signal-to-Noise Plus
Distortion Ratio
Crosstalk Between Channels
15MHz Input
70MHz Input
140MHz Input
Up to 315MHz Input
l
66.1
66.7
66.8
Crosstalk
21576512fb
For more information
www.linear.com/LTC2157-12
3
LTC2157-12/
LTC2156-12/LTC2155-12
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER
V
CM
Output Voltage
V
CM
Output Temperature Drift
V
CM
Output Resistance
V
REF
Output Voltage
V
REF
Output Temperature Drift
V
REF
Output Resistance
V
REF
Line Regulation
–400µA < I
OUT
< 1mA
1.7V < V
DD
< 1.9V
–1mA < I
OUT
< 1mA
I
OUT
= 0
1.225
CONDITIONS
I
OUT
= 0
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
0.435 • V
DD
– 18mV
TYP
0.435 • V
DD
±37
4
1.250
±30
7
0.6
1.275
MAX
0.435 • V
DD
+ 18mV
UNITS
V
ppm/°C
Ω
V
ppm/°C
Ω
mV/V
POWER REQUIREMENTS
SYMBOL PARAMETER
V
DD
OV
DD
I
VDD
I
OVDD
P
DISS
P
SLEEP
P
NAP
Analog Supply Voltage
Output Supply Voltage
Analog Supply Current
Digital Supply Current
Power Dissipation
Sleep Mode Power
Nap Mode Power
CONDITIONS
(Note 9)
(Note 9)
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
LTC2157-12
MIN
TYP MAX
l
l
l
LTC2156-12
MIN
TYP MAX
1.7
1.7
1.8
1.8
291
38
66
592
643
<5
<5
168
1.9
1.9
320
45
75
657
711
LTC2155-12
MIN
TYP MAX
1.7
1.7
1.8
1.8
266
37
65
545
596
<5
<5
154
1.9
1.9
295
42
74
607
665
UNITS
V
V
mA
mA
mA
mW
mW
mW
mW
mW
1.7
1.7
1.8
1.8
309
40
68
628
679
<5
<5
181
1.9
1.9
345
46
76
704
758
1.75mA LVDS Mode
3.5mA LVDS Mode
1.75mA LVDS Mode
3.5mA LVDS Mode
Clock Disabled
Clocked at f
S(MAX)
Clocked at f
S(MAX)
l
l
l
l
DIGITAL INPUTS AND OUTPUTS
SYMBOL PARAMETER
ENCODE INPUTS (ENC
+
, ENC
–
)
V
ID
V
ICM
R
IN
C
IN
V
IH
V
IL
I
IN
C
IN
R
OL
I
OH
C
OUT
Differential Input Voltage
Common Mode Input Voltage
Input Resistance
Input Capacitance
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
Logic Low Output Resistance to GND
Logic High Output Leakage Current
Output Capacitance
(Note 8)
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
l
l
MIN
0.2
1.1
TYP
MAX
UNITS
V
Internally Set
Externally Set (Note 8)
(See Figure 2)
(Note 8)
V
DD
= 1.8V
V
DD
= 1.8V
V
IN
= 0V to 3.6V
(Note 8)
V
DD
= 1.8V, SDO = 0V
SDO = 0V to 3.6V
(Note 8)
1.2
10
2
1.5
V
V
kΩ
pF
V
DIGITAL INPUTS (CS, SDI, SCK)
l
l
l
1.3
0.6
–10
3
200
10
V
µA
pF
Ω
SDO OUTPUT (Open-Drain Output. Requires 2k Pull-Up Resistor if SDO Is Used)
l
–10
4
10
µA
pF
21576512fb
4
For more information
www.linear.com/LTC2157-12
LTC2157-12/
LTC2156-12/LTC2155-12
DIGITAL INPUTS AND OUTPUTS
SYMBOL PARAMETER
DIGITAL DATA OUTPUTS
V
OD
V
OS
R
TERM
Differential Output Voltage
Common Mode Output Voltage
On-Chip Termination Resistance
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
100Ω Differential Load, 3.5mA Mode
100Ω Differential Load, 1.75mA Mode
Termination Enabled, OV
DD
= 1.8V
l
l
l
l
MIN
247
125
1.125
1.125
TYP
350
175
1.250
1.250
100
MAX
454
250
1.375
1.375
UNITS
mV
mV
V
V
Ω
TIMING CHARACTERISTICS
SYMBOL
f
S
t
L
t
H
PARAMETER
Sampling Frequency
ENC Low Time (Note 8)
ENC High Time (Note 8)
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
(Note 9)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
MIN
10
1.9
1.5
1.9
1.5
LTC2157-12
TYP MAX
250
2
50
2
50
2
50
2
50
MIN
10
2.26
1.5
2.26
1.5
LTC2156-12
TYP MAX
210
2.38
50
2.38
50
2.38
50
2.38
50
LTC2155-12
MIN
TYP MAX
10
170
2.79 2.94
50
1.5
2.94
50
2.79 2.94
50
1.5
2.94
50
UNITS
MHz
ns
ns
ns
ns
l
l
l
l
l
DIGITAL DATA OUTPUTS
LTC215X-12
SYMBOL
t
D
t
C
t
SKEW
PARAMETER
ENC to Data Delay
ENC to CLKOUT Delay
DATA to CLKOUT Skew
Pipeline Latency
SPI Port Timing (Note 8)
t
SCK
t
S
t
H
t
DS
t
DH
t
DO
SCK Period
CS
to SCK Set-Up Time
SCK to
CS
Hold Time
SDI Set-Up Time
SDI Hold Time
SCK Falling to SDO Valid
Readback Mode, C
SDO
= 20pF R
PULLUP
= 2k
,
Write Mode
Readback Mode C
SDO
= 20pF R
PULLUP
= 2k
,
l
l
l
l
l
l
l
CONDITIONS
C
L
= 5pF (Note 8)
C
L
= 5pF (Note 8)
t
D
– t
C
(Note 8)
MIN
l
l
l
TYP
2
1.6
0.4
MAX
2.3
2
0.55
6
UNITS
ns
ns
ns
Cycles
ns
ns
ns
ns
ns
ns
1.7
1.3
0.3
6
40
250
5
5
5
5
125
ns
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All voltage values are with respect to GND with GND and OGND
shorted (unless otherwise noted).
Note 3:
When these pin voltages are taken below GND or above V
DD
, they
will be clamped by internal diodes. This product can handle input currents
of greater than 100mA below GND or above V
DD
without latchup.
Note 4:
When these pin voltages are taken below GND they will be
clamped by internal diodes. When these pin voltages are taken above V
DD
they will not be clamped by internal diodes. This product can handle input
currents of greater than 100mA below GND without latchup.
Note 5:
V
DD
= OV
DD
= 1.8V, f
SAMPLE
= 250MHz (LTC2157),
210MHz (LTC2156), or 170MHz (LTC2155), differential ENC
+
/ENC
–
= 2V
P-P
sine wave, input range = 1.5V
P-P
with differential drive, unless otherwise noted.
Note 6:
Integral nonlinearity is defined as the deviation of a code from a
best fit straight line to the transfer curve. The deviation is measured from
the center of the quantization band.
Note 7:
Offset error is the offset voltage measured from –0.5LSB when the
output code flickers between 0000 0000 0000 and 1111 1111 1111 in 2’s
I have already learned about C51 MCU. I want to ask the teachers, if I want to engage in MCU development in the future, what knowledge do I need to learn that is not taught in universities? Thank you....
Because I just learned DSP, I used 2407 to generate 6-channel 3-pair symmetrical PWM. When I started to explore, the program always had problems compiling. Today I finished the program, but found that...
[i=s]This post was last edited by dcexpert on 2019-11-20 18:31[/i]1. What embedded operating systems have you heard of? Have you actually used an embedded operating system?I have been using MCU for ma...
[font=微软雅黑][size=3][color=#000000]Toshiba Brushless Motor[/color][color=#000000]The frequency conversion controller course is now online, with detailed and rigorous explanations and rich and practical...
After my instrument is assembled, that is, after installing the board and LCD into the casing, the LCD will have a distorted screen after a period of time. It will be fine if it is not installed in th...
Nios II is a configurable 16-/32-bit RISC processor. Combined with a rich set of peripheral-specific instructions and hardware acceleration units, it provides a highly flexible and powerful SOPC sy...[Details]
A vacuum eutectic furnace is a critical piece of equipment used in the manufacturing and processing of various materials, particularly in the fields of microelectronics and nanotechnology. One of t...[Details]
"Have you set your calendar reminder?"
On August 24, Nvidia Robotics' official account posted a photo of a black gift box on a social media platform, with an attached greeting card sig...[Details]
As the main model among new energy vehicles, pure electric vehicles have received strong support and encouragement from the country in recent years, and their development is changing with each pass...[Details]
Logic analyzers are widely used tools in digital design verification and debugging. They can verify the proper functioning of digital circuits and help users identify and troubleshoot faults. They ...[Details]
According to foreign media reports, Nissan Motor has recently reached a cooperation with US battery technology company LiCAP Technologies to jointly promote the research and development of next-gen...[Details]
introduction
According to the China Fire Statistics Yearbook, electrical fires accounted for more than 30% of fire accidents in the past decade, and the trend is increasing year by year. They ...[Details]
Chinese characters are extensive and profound, and there are many different names for ESD tubes. How many of them do you know?
As far as I know, ESD diodes are currently known as ESD p...[Details]
MQTT Ethernet I/O modules primarily collect I/O port information and transmit data over the network. In addition to being a TCP server, Ethernet I/O modules can also function as TCP clients. Furthe...[Details]
The driving mode is not unfamiliar to vehicles. According to the driving mode of the vehicle, there are front-wheel drive, rear-wheel drive and even four-wheel drive. Four-wheel drive is a major se...[Details]
On August 21, it was reported that Intel's new generation of AI chip Jaguar Shores was recently exposed for the first time.
According to photos shared by Andreas Schilling, the Jaguar Shores t...[Details]
Nascent Micro is launching devices covering a wide range of power applications, including gallium nitride (GaN) drivers, dual-channel automotive drivers, and battery protection MOSFETs.
...[Details]
Smartphones can be incredibly unintelligent. For example, consider an office full of people, each absorbed in their work. Suddenly, the silence is broken by a burst of loud pop music. A colleague's...[Details]
introduction
As core electronic components used in vastly different fields, automotive-grade chips and mobile/consumer-grade chips exhibit significant differences in their...[Details]
Reasons for the wear of the roller press reducer shaft:
1. Since the expansion sleeve is subjected to a large torque, the mating surfaces of the shaft and the sleeve move relative to each other...[Details]
Embedded System
京公网安备 11010802033920号
EEWORLD
