FEATURES
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LTC2285IUP#3CGPBF
Dual 14-Bit, 135Msps
Low Power 3.3V ADC
DESCRIPTION
The LTC
®
2285IUP#3CGPBF is a 14-bit 135Msps, low
power dual 3.3V A/D converter designed for digitiz-
ing high frequency, wide dynamic range signals. The
LTC2285IUP#3CGPBF is perfect for demanding imaging
and communications applications with AC performance
that includes 72.2dB SNR and 82dB SFDR for signals at
the Nyquist frequency.
Typical DC specs include
±1.5LSB
INL,
±0.6LSB
DNL. The
transition noise is a low 1.3LSB
RMS
.
A single 3.3V supply allows low power operation. A
separate output supply allows the outputs to drive 0.5V
to 3.6V logic.
A single-ended CLK input controls converter operation.
An optional clock duty cycle stabilizer allows high perfor-
mance at full speed for a wide range of clock duty cycles.
A data ready output clock (CLKOUT) can be used to latch
the output data.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
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Integrated Dual 14-Bit ADCs
Sample Rate: 135Msps
Single 3.3V Supply (2.85V to 3.4V)
Low Power: 954mW
72.4dB SNR, 88dB SFDR
110dB Channel Isolation at 100MHz
Flexible Input: 1V
P-P
to 2V
P-P
Range
640MHz Full Power Bandwidth S/H
Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Data Ready Output Clock
Pin Compatible Family
125Msps: LTC2283 (12-Bit), LTC2285 (14-Bit)
105Msps: LTC2282 (12-Bit), LTC2284 (14-Bit)
80Msps: LTC2294 (12-Bit), LTC2299 (14-Bit)
65Msps: LTC2293 (12-Bit), LTC2298 (14-Bit)
40Msps: LTC2292 (12-Bit), LTC2297 (14-Bit)
64-Pin (9mm
×
9mm) QFN Package
APPLICATIONS
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Wireless and Wired Broadband Communication
Imaging Systems
Spectral Analysis
Portable Instrumentation
TYPICAL APPLICATION
+
ANALOG
INPUT A
INPUT
S/H
OV
DD
14-BIT
PIPELINED
ADC CORE
OUTPUT
DRIVERS
D13A
D0A
OGND
SNR (dBFS)
•
•
•
SNR vs Input Frequency,
–1dB, 2V Range
75
74
73
72
71
70
69
68
67
66
–
CLK A
CLOCK/DUTY CYCLE
CONTROL
CLOCK/DUTY CYCLE
CONTROL
OF
MUX
CLK B
CLKOUT
OV
DD
65
0
50
+
ANALOG
INPUT B
INPUT
S/H
–
14-BIT
PIPELINED
ADC CORE
OUTPUT
DRIVERS
D13B
D0B
OGND
2285 TA01
•
•
•
100 150 200 250 300 350
2285 TA01b
INPUT FREQUENCY (MHz)
2285iup#3cgpbf
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LTC2285IUP#3CGPBF
ABSOLUTE MAXIMUM RATINGS
OV
DD
= V
DD
(Notes 1, 2)
PIN CONFIGURATION
TOP VIEW
64 GND
63 V
DD
62 SENSEA
61 VCMA
60 MODE
59 SHDNA
58
OEA
57 OF
56 DA13
55 DA12
54 DA11
53 DA10
52 DA9
51 DA8
50 OGND
49 OV
DD
A
INA+
1
A
INA–
2
REFHA 3
REFHA 4
REFLA 5
REFLA 6
V
DD
7
CLKA 8
CLKB 9
V
DD
10
REFLB 11
REFLB 12
REFHB 13
REFHB 14
A
INB–
15
A
INB+
16
65
48 DA7
47 DA6
46 DA5
45 DA4
44 DA3
43 DA2
42 DA1
41 DA0
40 CLKOUT
39 DB13
38 DB12
37 DB11
36 DB10
35 DB9
34 DB8
33 DB7
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 150°C,
θ
JA
= 20°C/W
EXPOSED PAD (PIN 65) IS GND AND MUST BE SOLDERED TO PCB
Supply Voltage (V
DD
) ..................................................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 .............................................1500mW
Operating Temperature Range
LTC2285IUP#3CGPBF .......................... –20°C to 85°C
Storage Temperature Range................... –65°C to 150°C
ORDER INFORMATION
LEAD FREE FINISH
LTC2285IUP#3CGPBF
PART MARKING
LTC2285UP
PACKAGE DESCRIPTION
64-Lead (9mm × 9mm) Plastic QFN
TEMPERATURE RANGE
–20°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
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/
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
Gain Error
Offset Drift
Full-Scale Drift
Gain Matching
Offset Matching
Transition Noise
SENSE = 1V
Internal Reference
External Reference
External Reference
CONDITIONS
CONVERTER CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
MIN
●
GND 17
V
DD
18
SENSEB 19
VCMB 20
MUX 21
SHDNB 22
OEB
23
DB0 24
DB1 25
DB2 26
DB3 27
DB4 28
DB5 29
DB6 30
OGND 31
OV
DD
32
TYP
±1.5
MAX
UNITS
Bits
LSB
14
–1
–12
–2.5
±0.6
±2
±0.5
±10
±30
±5
±0.3
±2
1.3
1.1
12
2.5
Differential Analog Input (Note 5)
Differential Analog Input
(Note 6)
External Reference
●
●
●
●
LSB
mV
%FS
μV/°C
ppm/°C
ppm/°C
%FS
mV
LSB
RMS
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LTC2285IUP#3CGPBF
ANALOG INPUT
SYMBOL
V
IN
V
IN,CM
I
IN
I
SENSE
I
MODE
t
AP
t
JITTER
CMRR
PARAMETER
Analog Input Range (A
IN+
–A
IN–
)
Analog Input Common Mode (A
IN+
+A
IN–
)/2
Analog Input Leakage Current
SENSEA, SENSEB Input Leakage
MODE Input Leakage Current
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Time Jitter
Analog Input Common Mode Rejection Ratio
Full Power Bandwidth
Figure 8 Test Circuit
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
2.85V < V
DD
< 3.4V (Note 7)
Differential Input Drive (Note 7)
Single Ended Input Drive (Note 7)
0V < A
IN+
, A
IN–
< V
DD
0V < SENSEA, SENSEB < 1V
0V < MODE < V
DD
●
●
●
●
●
●
MIN
1
0.5
–1
–3
–3
TYP
±0.5V
to
±1V
1.5
1.5
MAX
1.9
2
1
3
3
UNITS
V
V
V
μA
μA
μA
ns
ps
RMS
dB
MHz
0
0.2
80
640
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
30MHz Input
70MHz Input
140MHz Input
SFDR
Spurious Free Dynamic Range
2nd or 3rd Harmonic
5MHz Input
30MHz Input
70MHz Input
140MHz Input
SFDR
Spurious Free Dynamic Range
4th Harmonic or Higher
5MHz Input
30MHz Input
70MHz Input
140MHz Input
S/(N+D)
Signal-to-Noise Plus Distortion Ratio
5MHz Input
30MHz Input
70MHz Input
140MHz Input
I
MD
Intermodulation Distortion
Crosstalk
f
IN
= 40MHz, 41MHz
f
IN
= 100MHz
●
●
●
●
MIN
TYP
72.4
72.3
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
70
72.2
71.7
88
85
70
82
78
90
90
77
90
90
72.2
72
67
71.9
70.2
85
–110
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LTC2285IUP#3CGPBF
INTERNAL REFERENCE CHARACTERISTICS
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Resistance
2.85V < V
DD
< 3.4V
CONDITIONS
I
OUT
= 0
(Note 4)
MIN
1.475
TYP
1.500
±25
3
4
MAX
1.525
UNITS
V
ppm/°C
mV/V
Ω
|
I
OUT
|
< 1mA
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
I
IN
C
IN
LOGIC OUTPUTS
OV
DD
= 3.3V
C
OZ
I
SOURCE
I
SINK
V
OH
V
OL
OV
DD
= 2.5V
V
OH
V
OL
OV
DD
= 1.8V
V
OH
V
OL
High Level Output Voltage
Low Level Output Voltage
I
O
= –200μA
I
O
= 1.6mA
High Level Output Voltage
Low Level Output Voltage
I
O
= –200μA
I
O
= 1.6mA
Hi-Z Output Capacitance
Output Source Current
Output Sink Current
High Level Output Voltage
Low Level Output Voltage
OE
= High (Note 7)
V
OUT
= 0V
V
OUT
= 3.3V
I
O
= –10μA
I
O
= –200μA
I
O
= 10μA
I
O
= 1.6mA
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
CONDITIONS
V
DD
= 3.3V
V
DD
= 3.3V
V
IN
= 0V to V
DD
(Note 7)
LOGIC INPUTS (CLK,
OE,
SHDN, MUX)
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
●
●
●
TYP
MAX
UNITS
V
2
0.8
–10
3
10
V
μA
pF
3
50
50
●
●
pF
mA
mA
V
V
0.4
V
V
V
V
V
V
2.8
3.29
3.25
0.005
0.09
2.49
0.09
1.79
0.09
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LTC2285IUP#3CGPBF
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 8)
SYMBOL
V
DD
OV
DD
IV
DD
P
DISS
P
SHDN
P
NAP
PARAMETER
Analog Supply Voltage
Output Supply Voltage
Supply Current
Power Dissipation
Shutdown Power (Each Channel)
Nap Mode Power (Each Channel)
CONDITIONS
(Note 9)
(Note 9)
Both ADCs at f
S(MAX)
Both ADCs at f
S(MAX)
SHDN = H,
OE
= H, No CLK
SHDN = H,
OE
= L, No CLK
●
●
●
●
POWER REQUIREMENTS
MIN
2.85
0.5
TYP
3.3
3.3
289
954
2
15
MAX
3.4
3.6
325
1072
UNITS
V
V
mA
mW
mW
mW
TIMING CHARACTERISTICS
SYMBOL
f
s
t
L
t
H
t
AP
t
D
t
C
t
MD
PARAMETER
Sampling Frequency
CLK Low Time
CLK High Time
Sample-and-Hold Aperture Delay
CLK to DATA Delay
CLK to CLKOUT Delay
DATA to CLKOUT Skew
MUX to DATA Delay
Data Access Time After
OE↓
BUS Relinquish Time
Pipeline Latency
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
(Note 9)
Duty Cycle Stabilizer Off (Note 7)
Duty Cycle Stabilizer On (Note 7)
Duty Cycle Stabilizer Off (Note 7)
Duty Cycle Stabilizer On (Note 7)
C
L
= 5pF (Note 7)
C
L
= 5pF (Note 7)
(t
D
– t
C
) (Note 7)
C
L
= 5pF (Note 7)
C
L
= 5pF (Note 7)
(Note 7)
●
●
●
●
●
MIN
1
3.5
3
3.5
3
1.4
1.4
–0.6
1.4
TYP
3.7
3.7
3.7
3.7
0
2.7
2.7
0
2.7
4.3
3.3
5
MAX
135
500
500
500
500
5.4
5.4
0.6
5.4
10
8.5
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Cycles
●
●
●
●
●
●
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 ground with GND and OGND
wired together (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:
V
DD
= 3.3V, f
SAMPLE
= 135MHz, input range = 2V
P-P
with
differential drive, unless otherwise noted.
Note 5:
Integral nonlinearity is defined as the deviation of a code from a
straight line passing through the actual endpoints of the transfer curve.
The deviation is measured from the center of the quantization band.
Note 6:
Offset error is the offset voltage measured from –0.5 LSB when
the output code flickers between 00 0000 0000 0000 and
11 1111 1111 1111.
Note 7:
Guaranteed by design, not subject to test.
Note 8:
V
DD
= 3.3V, f
SAMPLE
= 135MHz, input range = 1V
P-P
with
differential drive. The supply current and power dissipation are the
sum total for both channels with both channels active.
Note 9:
Recommended operating conditions.
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