a high speed serial interface. It is designed for digitizing
high frequency, wide dynamic range signals with an input
bandwidth of 700MHz. The input range of the ADC can
be optimized using the PGA front end. The output data is
serialized according to the JEDEC Serial Interface for Data
Converters specification (JESD204).
The LTC2274 is perfect for demanding applications where
it is desirable to isolate the sensitive analog circuits from
the noisy digital logic. The AC performance includes a
77.7dB Noise Floor and 100dB spurious free dynamic range
(SFDR). Ultra low internal jitter of 80fs RMS allows under-
sampling of high input frequencies with excellent noise
performance. Maximum DC specs include ±4.5LSB INL
and ±1LSB DNL (no missing codes) over temperature.
The encode clock inputs, ENC
+
and ENC
–
, may be driven
differentially or single-ended with a sine wave, PECL,
LVDS, TTL or CMOS inputs. A clock duty cycle stabilizer
allows high performance at full speed with 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.
n
High Speed Serial Interface (JESD204)
Sample Rate: 105Msps
77.7dBFS Noise Floor
100dB SFDR
SFDR >82dB at 250MHz (1.5V
P-P
Input Range)
PGA Front End (2.25V
P-P
or 1.5V
P-P
Input Range)
700MHz Full Power Bandwidth S/H
Optional Internal Dither
Single 3.3V Supply
Power Dissipation: 1300mW
Clock Duty Cycle Stabilizer
Pin Compatible Family
105Msps: LTC2274
80Msps: LTC2273
65Msps: LTC2272
40-Pin 6mm
×
6mm QFN Package
APPLICATIONS
n
n
n
n
n
n
Telecommunications
Receivers
Cellular Base Stations
Spectrum Analysis
Imaging Systems
ATE
TYPICAL APPLICATION
3.3V
SENSE
V
CM
1.25V
COMMON MODE
BIAS VOLTAGE
INTERNAL ADC
REFERENCE
GENERATOR
FAM
SYNC
+
8B/10B
ENCODER
16
20
SYNC
–
OV
DD
1.2V TO 3.3V
0.1μF
50Ω
A
IN +
ANALOG
INPUT
A
IN
–
ASIC OR FPGA
128k Point FFT, f
IN
= 4.93MHz,
–1dBFS, PGA = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
2.2μF
50Ω
AMPLITUDE (dBFS)
CMLOUT
+
+
SERIAL
RECEIVER
+
S/H
AMP
–
CLOCK
CLOCK/DUTY
CYCLE
CONTROL
ENC
+
16-BIT
PIPELINED
ADC CORE
SERIALIZER
CORRECTION
LOGIC
CMLOUT
–
–
SCRAMBLER/
PATTERN
GENERATOR
20X
PLL
GND
V
DD
3.3V
0.1μF
0.1μF
2274 TA01
0
10
20
30
40
FREQUENCY (MHz)
50
2274 TA01b
ENC
–
PGA DITH MSBINV SHDN
PAT1 PAT0 SCRAM SRR1 SRR0
2274fb
1
LTC2274
ABSOLUTE MAXIMUM RATINGS
OV
DD
= V
DD
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
MSBINV
SCRAM
SENSE
PAT1
PAT0
SHDN
GND
GND
FAM
30 GND
29 SYNC
–
28 SYNC
+
27 GND
41
26 GND
25 OV
DD
24 CMLOUT
+
23 CMLOUT
–
22 OV
DD
21 GND
11 12 13 14 15 16 17 18 19 20
V
DD
GND
V
DD
GND
SRR0
SRR1
ISMODE
SHDN
DITH
PGA
V
CM
40 39 38 37 36 35 34 33 32 31
V
DD
1
V
DD
2
GND 3
A
IN+
A
IN–
4
5
Supply Voltage (V
DD
) ................................... –0.3V to 4V
Analog Input Voltage (Note 3) .......–0.3V to (V
DD
+ 0.3V)
Digital Input Voltage......................–0.3V to (V
DD
+ 0.3V)
Digital Output Voltage ................ –0.3V to (OV
DD
+ 0.3V)
Power Dissipation .............................................2000mW
Operating Temperature Range
LTC2274C ................................................ 0°C to 70°C
LTC2274I.............................................. –40°C to 85°C
Storage Temperature Range................... –65°C to 150°C
Digital Output Supply Voltage (OV
DD
) .......... –0.3V to 4V
GND 6
GND 7
GND 8
ENC
+
9
ENC
–
10
UJ PACKAGE
40-LEAD (6mm 6mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 22°C/W
EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2274CUJ#PBF
LTC2274IUJ#PBF
LEAD BASED FINISH
LTC2274CUJ
LTC2274IUJ
TAPE AND REEL
LTC2274CUJ#TRPBF
LTC2274IUJ#TRPBF
TAPE AND REEL
LTC2274CUJ#TR
LTC2274IUJ#TR
PART MARKING*
LTC2274UJ
LTC2274UJ
PART MARKING*
LTC2274UJ
LTC2274UJ
PACKAGE DESCRIPTION
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
PACKAGE DESCRIPTION
40-Lead (6mm
×
6mm) Plastic QFN
40-Lead (6mm
×
6mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
TEMPERATURE RANGE
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/
CONVERTER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
Differential Analog Input (Note 5) T
A
= 25°C
Differential Analog Input (Note 5)
Differential Analog Input
(Note 6)
External Reference
Internal Reference
External Reference
l
l
l
l
SYMBOL
Integral Linearity Error
Integral Linearity Error
Differential Linearity Error
Offset Error
Offset Drift
Gain Error
Full-Scale Drift
Transition Noise
MIN
TYP
±1.2
±1.5
±0.3
±1
±10
±0.2
±30
±15
3
MAX
±4
±4.5
±1
±8.5
±1.5
UNITS
LSB
LSB
LSB
mV
μV/°C
%FS
ppm/°C
ppm/°C
LSB
RMS
2274fb
2
LTC2274
ANALOG INPUT
SYMBOL
V
IN
V
IN, CM
I
IN
I
SENSE
C
IN
t
AP
t
JITTER
CMRR
BW-3dB
The
l
denotes denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
Analog Input Range (A
IN+
–
A
IN–
)
Analog Input Common Mode
Analog Input Leakage Current
SENSE Input Leakage Current
Analog Input Capacitance
Sample-and-Hold
Acquisition Delay Time
Sample-and-Hold
Acquisition Delay Time Jitter
Analog Input
Common Mode Rejection Ratio
Full Power Bandwidth
1V < (A
IN+
= A
IN–
) <1.5V
R
S
≤ 25Ω
CONDITIONS
3.135V ≤ V
DD
≤ 3.465V
Differential Input (Note 7)
0V ≤ A
IN+
,
A
IN–
≤ V
DD
(Note 10)
0V ≤ SENSE ≤ V
DD
(Note 11)
Sample Mode ENC
+
< ENC
–
Hold Mode ENC
+
> ENC
–
l
l
l
MIN
1
–1
–3
TYP
1.5 or 2.25
1.25
MAX
1.5
1
3
UNITS
V
P-P
V
μA
μA
pF
pF
ns
fs
RMS
dB
MHz
6.7
1.8
1
80
80
700
DYNAMIC ACCURACY
SYMBOL
SNR
PARAMETER
Signal-to-Noise Ratio
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 4)
CONDITIONS
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0), T
A
= 25°C
15MHz Input (2.25V Range, PGA = 0)
15MHz Input (1.5V Range, PGA = 1)
70MHz Input (2.25V Range, PGA = 0)
70MHz Input (1.5V Range, PGA = 1)
140MHz Input (2.25V Range, PGA = 0)
140MHz Input (1.5V Range, PGA = 1), T
A
= 25°C
140MHz Input (1.5V Range, PGA = 1)
170MHz Input (2.25V Range, PGA = 0)
170MHz Input (1.5V Range, PGA = 1)
SFDR
Spurious Free Dynamic Range
2
nd
or 3
rd
Harmonic
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0), T
A
= 25°C
15MHz Input (2.25V Range, PGA = 0)
15MHz Input (1.5V Range, PGA = 1)
70MHz Input (2.25V Range, PGA = 0)
70MHz Input (1.5V Range, PGA = 1)
140MHz Input (2.25V Range, PGA = 0)
140MHz Input (1.5V Range, PGA = 1), T
A
= 25°C
140MHz Input (1.5V Range, PGA = 1)
170MHz Input (2.25V Range, PGA = 0)
170MHz Input (1.5V Range, PGA = 1)
81
80
l
l
MIN
TYP
77.6
75.4
MAX
UNITS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
76.5
76.2
77.5
77.2
75.3
77.2
75.1
l
73.8
73.4
76.3
74.5
74.2
75.9
74.3
100
100
85
84
95
95
100
86
94
85
90
89
80
85
l
2274fb
3
LTC2274
DYNAMIC ACCURACY
SYMBOL
SFDR
PARAMETER
Spurious Free Dynamic Range 4
th
Harmonic or Higher
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS unless otherwise noted. (Note 4)
CONDITIONS
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0)
15MHz Input (1.5V Range, PGA = 1)
70MHz Input (2.25V Range, PGA = 0)
70MHz Input (1.5V Range, PGA = 1)
140MHz Input (2.25V Range, PGA = 0)
140MHz Input (1.5V Range, PGA = 1)
170MHz Input (2.25V Range, PGA = 0)
170MHz Input (1.5V Range, PGA = 1)
S/(N+D)
Signal-to-Noise
Plus Distortion Ratio
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0), T
A
= 25°C
15MHz Input (2.25V Range, PGA = 0
15MHz Input (1.5V Range, PGA = 1)
70MHz Input (2.25V Range, PGA = 0)
70MHz Input (1.5V Range, PGA = 1)
140MHz Input (2.25V Range, PGA = 0), T
A
= 25°C
140MHz Input (1.5V Range, PGA = 1)
140MHz Input (1.5V Range, PGA = 1)
170MHz Input (2.25V Range, PGA = 0)
170MHz Input (1.5V Range, PGA = 1)
SFDR
Spurious Free Dynamic Range
at –25dBFS Dither “OFF”
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0)
15MHz Input (1.5V Range, PGA = 1)
70MHz Input (2.25V Range, PGA = 0)
70MHz Input (1.5V Range, PGA = 1)
140MHz Input (2.25V Range, PGA = 0)
140MHz Input (1.5V Range, PGA = 1)
170MHz Input (2.25V Range, PGA = 0)
170MHz Input (1.5V Range, PGA = 1)
SFDR
Spurious Free Dynamic Range
at –25dBFS Dither “ON”
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0)
15MHz Input (1.5V Range, PGA = 1)
70MHz Input (2.25V Range, PGA = 0)
70MHz Input (1.5V Range, PGA = 1)
140MHz Input (2.25V Range, PGA = 0)
140MHz Input (1.5V Range, PGA = 1)
170MHz Input (2.25V Range, PGA = 0)
170MHz Input (1.5V Range, PGA = 1)
l
l
l
l
MIN
TYP
100
100
MAX
UNITS
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBc
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
dBFS
90
100
100
100
100
85
95
100
90
95
77.5
75.3
76.3
75.9
77.4
77
75.2
76.7
74.2
l
73.6
73.2
75.3
74.3
74
73.4
73.4
105
105
105
105
105
105
100
100
100
100
115
115
97
115
115
115
115
110
110
105
105
2274fb
4
LTC2274
The
l
denotes the specifications which apply over
the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Resistance
CONDITIONS
I
OUT
= 0
I
OUT
= 0
3.135V ≤ V
DD
≤ 3.465V
–1mA ≤ | I
OUT
| ≤ 1mA
l
l
l
COMMON MODE BIAS CHARACTERISTICS
MIN
1.15
TYP
1.25
40
1
2
MAX
1.35
UNITS
V
ppm/°C
mV/V
Ω
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
ID
V
ICM
R
IN
C
IN
V
SID
V
SICM
R
SIN
C
SIN
V
IH
V
IL
I
IN
C
IN
V
OH
PARAMETER
Differential Input Voltage
Common Mode Input Voltage
Input Resistance
Input Capacitance
SYNC
Differential Input
Voltage
SYNC
Common Mode Input
Voltage
SYNC
Input Resistance
SYNC
Input Capacitance
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
Output High Level
Directly-Coupled 50Ω to OV
DD
Directly-Coupled 100Ω Differential
AC-Coupled
Directly-Coupled 50Ω to OV
DD
Directly-Coupled 100Ω Differential
AC-Coupled
Directly-Coupled 50Ω to OV
DD
Directly-Coupled 100Ω Differential
AC-Coupled
Single-Ended Differential
V
DD
= 3.3V
V
DD
= 3.3V
V
IN
= 0V to V
DD
(Note 7)
Internally Set
Externally Set (Note 7)
CONDITIONS
(Note 7)
Internally Set
Externally Set (Note 7)
(See Figure 2)
Encode Inputs (ENC
+
, ENC
–
)
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
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DSP 与 ARM 处理器
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