The combination of high sample rate, low noise and high
linearity enable a new generation of digital radio designs.
The direct sampling front-end is designed specifically for
the most demanding receiver applications such as software
defined radio and multi-channel GSM base stations. The
AC performance includes, SNR = 80dBFS, SFDR = 98dBFS.
Aperture jitter = 45fs
RMS
allows direct sampling of IF
frequencies up to 500MHz with excellent performance.
Features such as internal dither, a PGA front-end and
digital output randomization help maximize performance.
Modes of operation can be controlled through a 3-wire
serial interface (SPI).
The double data rate (DDR) low voltage differential (LVDS)
digital outputs help reduce digital line count and enable
space saving designs.
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.
Protected by U.S. Patents, including 7683695, 8482442, 8648741.
98dBFS SFDR
80dBFS SNR Noise Floor
Aperture Jitter = 45fs
RMS
PGA Front-End 2.4V
P-P
or 1.6V
P-P
Input Range
Optional Internal Dither
Optional Data Output Randomizer
Power Dissipation: 1280mW
Shutdown Mode
Serial SPI Port for Configuration
Clock Duty Cycle Stabilizer
48-Lead (7mm
×
7mm) QFN Package
APPLICATIONS
n
n
n
n
n
n
Software Defined Radios
Military Radio and RADAR
Cellular Base Stations
Spectral Analysis
Imaging Systems
ATE and Instrumentation
BLOCK DIAGRAM
0V
2.5V
10µF
128k Point FFT,
f
IN
= 30.6MHz, –1dBFS, PGA = 0
OV
DD
1µF
AMPLITUDE (dBFS)
OF
±
1.8V
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
–140
SENSE
V
CM
2.2µF
A
IN+
ANALOG
INPUT
A
IN–
V
CM
V
CM
DRIVER
INTERNAL
REFERENCE
V
DD
+
–
INPUT
S/H
16-BIT
ADC CORE
CORRECTION
LOGIC
16
CLKOUT
±
OUTPUT
BUFFERS
D14_15±
•
•
•
D0_1±
OGND
CLOCK AND
CLOCK CONTROL
ENC
+
ENC
–
ADC CONTROL/SPI INTERFACE
SER/PAR SDI SCK
CS
SDO SHDN
GND
2107 BD
0
15
30
45
60
75
FREQUENCY (MHz)
90
105
2107 TA01
2107f
For more information
www.linear.com/LTC2107
1
LTC2107
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage
V
DD
...................................................... –0.3V to 2.8V
OV
DD
........................................................ –0.3V to 2V
Analog Input Voltage
A
IN+
, A
IN –
, ENC
+
, ENC
–
, PAR/SER, SENSE
(Note 3) ................................... –0.3V to (V
DD
+ 0.2V)
Digital Input Voltage
CS,
SDI, SCK (Note 4)........................... –0.3V to 3.9V
Digital Output Voltage ................ –0.3V to (OV
DD
+ 0.3V)
SDO (Note 4) ........................................ –0.3V to 3.9V
Operating Temperature Range
LTC2107C ................................................ 0°C to 70°C
LTC2107I..............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
48 GND
47 GND
46 PAR/SER
45
CS
44 SCK
43 SDI
42 OGND
41 OV
DD
40 OF
39 DNC
38 D15
37 D14
48 GND
47 GND
46 PAR/SER
45
CS
44 SCK
43 SDI
42 OGND
41 OV
DD
40 OF
+
39 OF –
38 D14_15
+
37 D14_15
–
49
GND
UK PACKAGE
48-LEAD (7mm
×
7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
FULL-RATE CMOS OUTPUT MODE
TOP VIEW
DOUBLE DATA RATE LVDS OUTPUT MODE
TOP VIEW
SENSE 1
GND 2
GND 3
V
DD
4
V
DD
5
V
DD
6
GND 7
A
IN+
8
A
IN–
9
GND 10
V
CM
11
GND 12
49
GND
36 D13
35 D12
34 D11
33 D10
32 CLKOUT
+
31 CLKOUT
–
30 D9
29 D8
28 D7
27 D6
26 D5
25 D4
SENSE 1
GND 2
GND 3
V
DD
4
V
DD
5
V
DD
6
GND 7
A
IN+
8
A
IN–
9
GND 10
V
CM
11
GND 12
36 D12_13
+
35 D12_13
–
34 D10_11
+
33 D10_11
–
32 CLKOUT
+
31 CLKOUT
–
30 D8_9
+
29 D8_9
–
28 D6_7
+
27 D6_7
–
26 D4_5
+
25 D4_5
–
GND 13
ENC
+
14
ENC
–
15
GND 16
SHDN 17
SDO 18
OGND 19
OV
DD
20
D0 21
D1 22
D2 23
D3 24
UK PACKAGE
48-LEAD (7mm
×
7mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 29°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2107CUK#PBF
LTC2107IUK#PBF
TAPE AND REEL
LTC2107CUK#TRPBF
LTC2107IUK#TRPBF
PART MARKING*
LTC2107UK
LTC2107UK
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic QFN
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/
GND 13
ENC
+
14
ENC
–
15
GND 16
SHDN 17
SDO 18
OGND 19
OV
DD
20
D0_1
–
21
D0_1
+
22
D2_3
–
23
D2_3
+
24
2107f
2
For more information
www.linear.com/LTC2107
LTC2107
temperature range, otherwise specifications are at T
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