designed for digitizing high frequency, wide dynamic range
signals up to input frequencies of 700MHz. The input range
of the ADC can be optimized with the PGA front end.
The LTC2205-14 is perfect for demanding communications
applications, with AC performance that includes 78.3dB
SNR and 98dB spurious free dynamic range (SFDR).
Ultralow jitter of 90fs
RMS
allows undersampling of high
input frequencies with excellent noise performance.
Maximum DC specs include ±1.5LSB INL, ±1LSB DNL
(no missing codes).
A separate output power supply allows the CMOS output
swing to range from 0.5V to 3.6V.
The ENC
+
and ENC
–
inputs may be driven differentially
or single-ended with a sine wave, PECL, LVDS, TTL or
CMOS inputs. An optional clock duty cycle stabilizer
allows high performance at full speed with a wide range
of clock duty cycles.
, LT LTC and LTM are registered trademarks of Linear Technology Corporation.
,
All other trademarks are the property of their respective owners.
n
Sample Rate: 65Msps
78.3dB SNR and 98dB SFDR (2.25V
P-P
Range)
SFDR >90dB at 140MHz (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
Optional Data Output Randomizer
Single 3.3V Supply
Power Dissipation: 600mW
Optional Clock Duty Cycle Stabilizer
Out-of-Range Indicator
Pin Compatible Family
105Msps: LTC2207 (16-Bit), LTC2207-14 (14-Bit)
80Msps: LTC2206 (16-Bit), LTC2206-14 (14-Bit)
65Msps: LTC2205 (16-Bit)
40Msps: LTC2204 (16-Bit)
48-Pin (7mm
×
7mm) QFN Package
APPLICATIONS
n
n
n
n
n
n
Telecommunications
Receivers
Cellular Base Stations
Spectrum Analysis
Imaging Systems
ATE
TYPICAL APPLICATION
3.3V
SENSE
OV
DD
V
CM
2.2μF
AIN
+
ANALOG
INPUT
AIN
–
1.25V
COMMON MODE
BIAS VOLTAGE
INTERNAL ADC
REFERENCE
GENERATOR
0.5V TO 3.6V
0.1μF
OF
CLKOUT
D13
•
•
•
D0
OGND
CLOCK/DUTY
CYCLE
CONTROL
V
DD
0.1μF
GND
ENC
ENC
PGA
SHDN
DITH
MODE
OE
RAND
0.1μF
220514 TA01
LTC2205-14: 32K Point FFT,
f
IN
= 5.1MHz, –1dBFS,
PGA = 0, DITH = 0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
5
10
20
25
15
FREQUENCY (MHz)
30
220514 G04
S/H
AMP
–
14-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC AND
SHIFT REGISTER
OUTPUT
DRIVERS
3.3V
0.1μF
ADC CONTROL INPUTS
AMPLITUDE (dBFS)
+
220514fb
1
LTC2205-14
ABSOLUTE MAXIMUM RATINGS
OV
DD
= V
DD
(Notes 1 and 2)
PIN CONFIGURATION
48 GND
47 PGA
46 RAND
45 MODE
44 OE
43 OF
42 D13
41 D12
40 D11
39 D10
38 OGND
37 OV
DD
SENSE 1
V
CM
2
V
DD
3
V
DD
4
GND 5
AIN+ 6
AIN
–
7
GND 8
ENC
+
9
ENC
–
10
GND 11
V
DD
12
49
36 OV
DD
35 D9
34 D8
33 D7
32 D6
31 OGND
30 CLKOUT+
29 CLKOUT
–
28 D5
27 D4
26 D3
25 OV
DD
UK PACKAGE
48-LEAD (7mm 7mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 29°C/W
EXPOSED PAD IS GND (PIN 49), MUST BE SOLDERED TO PCB BOARD
TOP VIEW
Supply Voltage (V
DD
) .................................. –0.3V to 4V
Digital Output Ground Voltage (OGND)....... –0.3V to 1V
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
LTC2205-14C .......................................... 0°C to 70°C
LTC2205-14I ....................................... –40°C to 85°C
Storage Temperature Range ................. –65°C to 150°C
Digital Output Supply Voltage (OV
DD
) ......... –0.3V to 4V
ORDER INFORMATION
LEAD FREE FINISH
LTC2205CUK-14#PBF
LTC2205IUK-14#PBF
LEAD BASED FINISH
LTC2205CUK-14
LTC2205IUK-14
TAPE AND REEL
LTC4263CDE#TRPBF
LTC4263IDE#TRPBF
TAPE AND REEL
LTC2205CUK-14#TR
LTC2205IUK-14#TR
PART MARKING*
LTC2205UK-14
LTC2205UK-14
PART MARKING*
LTC2205UK-14
LTC2205UK-14
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic QFN
48-Lead (7mm
×
7mm) Plastic QFN
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
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
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
Resolution (No Missing Codes)
Integral Linearity Error
Differential Linearity Error
Offset Error
Offset Drift
Gain Error
Full-Scale Drift
Transition Noise
External Reference
Internal Reference
External Reference
l
CONDITIONS
l
V
DD
13
V
DD
14
GND 15
SHDN 16
DITH 17
NC 18
NC 19
D0 20
D1 21
D2 22
OGND 23
OV
DD
24
MIN
14
l
l
l
TYP
±0.6
±0.2
±1
±10
±0.3
±30
±10
0.7
MAX
±1.5
±1
±8.5
±1.9
UNITS
Bits
LSB
LSB
mV
μV/
°C
%FS
ppm/°C
ppm/°C
LSB
RMS
220514fb
Differential Analog Input (Note 5)
Differential Analog Input
(Note 6)
2
LTC2205-14
The
●
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
SYMBOL
V
IN
V
IN, CM
I
IN
I
SENSE
I
MODE
C
IN
t
AP
t
JITTER
CMRR
BW-3dB
PARAMETER
Analog Input Range (A
IN+
–
A
IN–
)
Analog Input Common Mode
Analog Input Leakage Current
SENSE Input Leakage Current
MODE Pin Pull-Down Current to GND
Analog Input Capacitance
Sample-and-Hold
Aperature Delay Time
Sample-and-Hold
Aperature Delay Time Jitter
Analog Input
Common Mode Rejection Ratio
Full Power Bandwidth
1V < (A
IN+
= A
IN–
) <1.5V
Sample Mode ENC
+
< ENC
–
Hold Mode ENC
+
> ENC
–
CONDITIONS
3.135V ≤ V
DD
≤ 3.465V
Differential Input (Note 7)
0V ≤ A
IN+
,
A
IN–
≤ V
DD
0V ≤ SENSE ≤ V
DD
l
l
l
l
ANALOG INPUT
MIN
1
–1
–3
TYP
1.5 to 2.25
1.25
MAX
1.5
1
3
UNITS
V
P-P
V
μA
μA
μA
pF
pF
ns
fs
RMS
dB
MHz
10
6.5
1.8
0.7
90
60
700
The
●
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C. A
IN
= –1dBFS. (Note 4)
SYMBOL PARAMETER
SNR
Signal-to-Noise Ratio
CONDITIONS
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
15MHz Input (2.25V Range, PGA = 0)
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)
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
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)
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)
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
DYNAMIC ACCURACY
MIN
TYP
78.3
76.0
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
76.8
77.2
78.2
78.2
76.0
77.7
75.7
76.4
74.9
75.6
74.2
98
98
l
74.2
74.7
85
86
98
98
98
90
92
92
88
90
80
82
l
82
83
220514fb
3
LTC2205-14
DYNAMIC ACCURACY
SYMBOL PARAMETER
SFDR
Spurious Free Dynamic Range
4
th
Harmonic or Higher
The
●
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)
l
MIN
TYP
103
103
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
87
98
98
98
98
95
95
93
93
78.2
75.9
l
86.5
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)
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)
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
76.7
77.1
78.1
78.1
75.9
77.4
75.5
75.5
75.9
74.7
73.6
73.2
103
103
103
103
103
103
98
98
98
98
113
113
l
73.5
74.0
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
95
113
113
110
110
110
110
103
103
220514fb
4
LTC2205-14
COMMON MODE BIAS CHARACTERISTICS
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
The
●
denotes the specifications which apply over
the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
1.15
TYP
1.25
±40
1
1
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
IH
V
IL
I
IN
C
IN
LOGIC OUTPUTS
OV
DD
= 3.3V
V
OH
V
OL
I
SOURCE
I
SINK
OV
DD
= 2.5V
V
OH
V
OL
OV
DD
= 1.8V
V
OH
V
OL
High Level Output Voltage
Low Level Output Voltage
V
DD
= 3.3V
V
DD
= 3.3V
High Level Output Voltage
Low Level Output Voltage
V
DD
= 3.3V
V
DD
= 3.3V
High Level Output Voltage
Low Level Output Voltage
Output Source Current
Output Sink Current
V
DD
= 3.3V
V
DD
= 3.3V
V
OUT
= 0V
V
OUT
= 3.3V
PARAMETER
Differential Input Voltage (Note 7)
Common Mode Input Voltage
Input Resistance
Input Capacitance
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
Internally Set
Externally Set (Note 7)
(See Figure 2)
(Note 7)
V
DD
= 3.3V
V
DD
= 3.3V
V
IN
= 0V to V
DD
(Note 7)
CONDITIONS
ENCODE INPUTS (ENC
+
, ENC
–
)
The
●
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
l
TYP
MAX
UNITS
V
0.2
1.6
1.2
6
3
3.0
V
V
kΩ
pF
V
LOGIC INPUTS (DITH, PGA, SHDN, RAND)
l
l
l
2
0.8
±10
1.5
V
μA
pF
I
O
= –10μA
I
O
= –200μA
I
O
= –160μA
I
O
= –1.6μA
l
l
3.1
3.299
3.29
0.01
0.10
–50
50
0.4
V
V
V
V
mA
mA
V
V
V
V
I
O
= –200μA
I
O
= 1.60mA
I
O
= –200μA
I
O
= 1.60mA
2.49
0.1
1.79
0.1
POWER REQUIREMENTS
SYMBOL
V
DD
P
SHDN
OV
DD
I
VDD
P
DIS
PARAMETER
Analog Supply Voltage
Shutdown Power
Output Supply Voltage
Analog Supply Current
Power Dissipation
The
●
denotes the specifications which apply over the full operating temperature
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