LTC2208
16-Bit, 130Msps ADC
FEATURES
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DESCRIPTIO
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Sample Rate: 130Msps
78dBFS Noise Floor
100dB SFDR
SFDR >83dB 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
Optional Data Output Randomizer
LVDS or CMOS Outputs
Single 3.3V Supply
Power Dissipation: 1.25W
Clock Duty Cycle Stabilizer
Pin Compatible 14-Bit Version
130Msps: LTC2208 (16-Bit), LTC2208-14 (14-Bit)
64-Pin (9mm
×
9mm) QFN Package
The LTC
®
2208 is a 130Msps, sampling 16-bit A/D con-
verter designed for digitizing high frequency, wide dynamic
range signals with input frequencies up to 700MHz. The
input range of the ADC can be optimized with the PGA
front end.
The LTC2208 is perfect for demanding communications
applications, with AC performance that includes 78dBFS
Noise Floor and 100dB spurious free dynamic range
(SFDR). Ultra low jitter of 70fs
RMS
allows undersampling
of high input frequencies with excellent noise performance.
Maximum DC specs include ±4LSB INL, ±1LSB DNL (no
missing codes).
The digital output can be either differential LVDS or
single-ended CMOS. There are two format options for the
CMOS outputs: a single bus running at the full data rate or
demultiplexed buses running at half data rate. 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 al-
lows high performance at full speed with a wide range of
clock duty cycles.
APPLICATIO S
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Telecommunications
Receivers
Cellular Base Stations
Spectrum Analysis
Imaging Systems
ATE
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
3.3V
SENSE
V
CM
2.2µF
1.25V
COMMON MODE
BIAS VOLTAGE
INTERNAL ADC
REFERENCE
GENERATOR
OV
DD
0.5V TO 3.6V
1µF
OF
CLKOUT
D15
•
•
•
D0
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
–130
0
10
50
20
40
30
FREQUENCY (MHz)
60
2208 G03
ANALOG
INPUT
AIN
–
S/H
AMP
–
16-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC AND
SHIFT REGISTER
OUTPUT
DRIVERS
CMOS
OR
LVDS
OGND
CLOCK/DUTY
CYCLE
CONTROL
V
DD
GND
ENC
+
ENC
–
PGA
SHDN
DITH
MODE
LVDS
RAND
1µF
1µF
3.3V
1µF
2208 TA01
ADC CONTROL INPUTS
2208fa
AMPLITUDE (dBFS)
AIN
+
+
U
64k Point FFT, F
IN
= 15.1MHz,
–1dB, PGA = 0
U
U
1
LTC2208
ABSOLUTE
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
64 PGA
63 RAND
62 MODE
61 LVDS
60 OF
+
/OFA
59 OF
–
/DA15
58 D15
+
/DA14
57 D15
–
/DA13
56 D14
+
/DA12
55 D14
–
/DA11
54 D13
+
/DA10
53 D13
–
/DA9
52 D12
+
/DA8
51 D12
–
/DA7
50 OGND
49 OV
DD
OV
DD
= V
DD
(Notes 1 and 2)
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
LTC2208C ................................................ 0°C to 70°C
LTC2208I .............................................–40°C to 85°C
Storage Temperature Range ..................–65°C to 150°C
Digital Output Supply Voltage (OV
DD
) .......... –0.3V to 4V
SENSE 1
GND 2
V
CM
3
GND 4
V
DD
5
V
DD
6
GND 7
AIN
+
8
AIN
–
9
GND 10
GND 11
ENC
+
12
ENC
–
13
GND 14
V
DD
15
V
DD
16
65
48 D11
+
/DA6
47 D11
–
/DA5
46 D10
+
/DA4
45 D10
–
/DA3
44 D9
+
/DA2
43 D9
–
/DA1
42 D8
+
/DA0
41 D8
–
/CLKOUTA
40 CLKOUT
+
/CLKOUTB
39 CLKOUT
–
/OFB
38 D7
+
/DB15
37 D7
–
/DB14
36 D6
+
/DB13
35 D6
–
/DB12
34 D5
+
/DB11
33 D5
–
/DB10
ORDER PART
NUMBER
LTC2208CUP
LTC2208IUP
V
DD
17
GND 18
SHDN 19
DITH 20
D0
–
/DB0 21
DO
+
/DB1 22
D1
–
/DB2 23
D1
+
/DB3 24
D2
–
/DB4 25
D2
+
/DB5 26
D3
–
/DB6 27
D3
+
/DB7 28
D4
–
/DB8 29
D4
+
/DB9 30
OGND 31
OV
DD
32
EXPOSED PAD IS GND (PIN 65)
MUST BE SOLDERED TO PCB BOARD
T
JMAX
= 125°C,
θ
JA
= 20°C/W**
UP PART
MARKING*
LTC2208UP
Order Options
Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking:
http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
**T
JMAX
= 150°C, option available, consult factory.
CO VERTER CHARACTERISTICS
PARAMETER
Integral Linearity Error
Integral Linearity Error
Differential Linearity Error
Offset Error
Offset Drift
Gain Error
Full-Scale Drift
Transition Noise
The
●
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
External Reference
MIN
TYP
±1.2
±1.5
±0.3
±2
±10
±0.2
±30
±15
2.9
MAX
±4.0
±4.5
±1
±8.5
±1.5
UNITS
LSB
LSB
LSB
mV
μV/
°C
%FS
ppm/°C
ppm/°C
●
●
●
●
LSB
RMS
2208fa
2
U
W
U
U
W W
W
U
LTC2208
A ALOG I PUT
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
I
LVDS
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
LVDS Pin Pull-Down Current to GND
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
CONDITIONS
3.135V ≤ V
DD
≤ 3.465V
Differential Input (Note 7)
0V ≤ A
IN+
,
A
IN–
≤ V
DD
0V ≤ SENSE ≤ V
DD
●
●
●
DY A IC ACCURACY
SYMBOL
SNR
PARAMETER
Signal-to-Noise Ratio
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)
CONDITIONS
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
30MHz Input (2.25V Range, PGA = 0) T
A
= 25°C
30MHz Input (2.25V Range, PGA = 0)
30MHz 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)
250MHz Input (2.25V Range, PGA = 0)
250MHz Input (1.5V Range, PGA =1 )
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
30MHz Input (2.25V Range, PGA = 0) T
A
= 25°C
30MHz Input (2.25V Range, PGA = 0)
30MHz 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)
250MHz Input (2.25V Range, PGA = 0)
250MHz Input (1.5V Range, PGA = 1)
MIN
TYP
77.7
75.3
77.6
77.3
75.2
77.5
75.1
76.9
74.8
74.5
75.4
73.8
100
100
95
94
100
90
95
85
90
89
78
83
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
SFDR
Spurious Free
Dynamic Range
2
nd
or 3
rd
Harmonic
U
W U
U
MIN
1
–1
–3
TYP
1.5 or 2.25
1.25
MAX
1.5
1
3
UNITS
V
P-P
V
µA
µA
µA
µA
pF
pF
ns
fs RMS
dB
MHz
Sample Mode ENC
+
< ENC
–
Hold Mode ENC
+
> ENC
–
10
10
6.5
1.8
1
70
1V < (A
IN+
= A
IN–
) <1.5V
R
S
< 25Ω
80
700
●
76.5
76.1
●
73.8
73.4
●
88
87
●
86
84
2208fa
3
LTC2208
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)
SYMBOL
SFDR
PARAMETER
Spurious Free
Dynamic Range
4
th
Harmonic
or Higher
CONDITIONS
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
30MHz Input (2.25V Range, PGA = 0)
30MHz 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)
250MHz Input (2.25V Range, PGA = 0)
250MHz Input (1.5V Range, PGA = 1)
5MHz Input (2.25V Range, PGA = 0)
5MHz Input (1.5V Range, PGA = 1)
30MHz Input (2.25V Range, PGA = 0) T
A
= 25°C
30MHz Input (2.25V Range, PGA = 0)
30MHz 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)
250MHz Input (2.25V Range, PGA = 0)
250MHz 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)
30MHz Input (2.25V Range, PGA = 0)
30MHz 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)
250MHz Input (2.25V Range, PGA = 0)
250MHz 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)
30MHz Input (2.25V Range, PGA = 0)
30MHz 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)
250MHz Input (2.25V Range, PGA = 0)
250MHz Input (1.5V Range, PGA = 1)
MIN
TYP
100
100
100
100
100
100
95
95
90
90
77.7
75.3
77.5
77.5
75.2
77.4
75
76.4
74.5
74.5
73.6
72.9
105
105
105
105
105
105
100
100
100
100
115
115
115
115
115
115
110
110
105
105
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
DY A IC ACCURACY
S/(N+D)
4
W U
●
90
●
88
Signal-to-Noise
Plus Distortion Ratio
●
76.3
75.9
●
73.6
73.2
●
100
2208fa
LTC2208
CO
The
●
denotes the specifications which apply over
the full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
I
OUT
= 0
I
OUT
= 0
3.135V ≤ V
DD
≤ 3.465V
1mA ≤ | I
OUT
| ≤ 1mA
MIN
1.15
TYP
1.25
+40
1
2
MAX
1.35
UNITS
V
ppm/°C
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Resistance
DIGITAL I PUTS A D DIGITAL OUTPUTS
SYMBOL
PARAMETER
ENCODE INPUTS (ENC
+
, ENC
–
)
V
ID
V
ICM
R
IN
Differential Input Voltage
Common Mode Input Voltage
CONDITIONS
(Note 7)
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)
The
●
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
●
Input Resistance
C
IN
Input Capacitance
LOGIC INPUTS (DITH, PGA, SHDN, RAND)
V
IH
High Level Input Voltage
V
IL
Low Level Input Voltage
I
IN
Digital Input Current
C
IN
Digital Input Capacitance
LOGIC OUTPUTS (CMOS MODE)
OV
DD
= 3.3V
V
OH
High Level Output Voltage
V
OL
Low Level Output Voltage
I
SOURCE
Output Source Current
I
SINK
Output Sink Current
OV
DD
= 2.5V
High Level Output Voltage
V
OH
V
OL
Low Level Output Voltage
OV
DD
= 1.8V
V
OH
High Level Output Voltage
V
OL
Low Level Output Voltage
LOGIC OUTPUTS (LVDS MODE)
STANDARD LVDS
V
OD
Differential Output Voltage
V
OS
Output Common Mode Voltage
LOW POWER LVDS
Differential Ouptut Voltage
V
OD
V
OS
Output Common Mode Voltage
U
U U UU
U
UU
O
U
ODE BIAS CHARACTERISTICS
mV/ V
Ω
TYP
MAX
UNITS
V
V
V
k
Ω
pF
V
V
µA
pF
0.2
1.6
1.2
6
3
3.0
●
●
●
2
0.8
±10
1.5
V
DD
= 3.3V
V
DD
= 3.3V
V
OUT
= 0V
V
OUT
= 3.3V
V
DD
= 3.3V
V
DD
= 3.3V
V
DD
= 3.3V
V
DD
= 3.3V
I
O
= –10µA
I
O
= –200µA
●
I
O
= 160µA
I
O
= 1.6mA
●
3.1
3.299
3.29
0.01
0.10
–50
50
2.49
0.1
1.79
0.1
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
100Ω Differential Load
100Ω Differential Load
100Ω Differential Load
100Ω Differential Load
●
●
●
●
247
1.125
125
1.125
350
1.2
175
1.2
454
1.375
250
1.375
mV
V
mV
V
2208fa
5
传感器
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