LTC2246H
14-Bit, 25Msps
125°C ADC In LQFP
FEATURES
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DESCRIPTION
The LTC
®
2246H is a 14-bit 25Msps, low power 3V A/D
converter designed for digitizing high frequency, wide
dynamic range signals. The LTC2246H is perfect for
demanding imaging and communications applications
with AC performance that includes 74.5dB SNR and 90dB
SFDR.
DC specs include ±1LSB INL (typ), ±0.5LSB DNL (typ)
and no missing codes over temperature. The transition
noise is a low 1LSB
RMS
.
A single 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 performance
at full speed for a wide range of clock duty cycles.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Sample Rate: 25Msps
–40°C to 125°C Operation
Single 3V Supply (2.8V to 3.5V)
Low Power: 75mW
74.5dB SNR
90dB SFDR
No Missing Codes
Flexible Input: 1V
P-P
to 2V
P-P
Range
575MHz Full Power Bandwidth S/H
Clock Duty Cycle Stabilizer
Shutdown and Nap Modes
Pin Compatible Family
LTC2246H (14-Bit), LTC2226H (12-Bit)
48-Pin (7mm
×
7mm) LQFP Package
APPLICATIONS
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Automotive
Industrial
Wireless and Wired Broadband Communication
TYPICAL APPLICATION
Typical INL, 2V Range
REFH
REFL
FLEXIBLE
REFERENCE
OV
DD
2.0
1.5
1.0
INL ERROR (LSB)
0.5
0
–0.5
–1.0
–1.5
–2.0
0
2246H TA01
+
ANALOG
INPUT
INPUT
S/H
–
14-BIT
PIPELINED
ADC CORE
CORRECTION
LOGIC
OUTPUT
DRIVERS
D13
•
•
•
D0
OGND
CLOCK/DUTY
CYCLE
CONTROL
4096
8192
CODE
12288
16384
2246H TA01b
CLK
2246hfa
1
LTC2246H
ABSOLUTE MAXIMUM RATINGS
OV
DD
= V
DD
(Notes 1, 2)
PACKAGE/ORDER INFORMATION
TOP VIEW
GND
V
DD
V
DD
V
CM
V
CM
SENSE
MODE
OF
D13
D12
D11
GND
GND 1
A
IN+
2
A
IN–
3
GND 4
REFH 5
REFH 6
REFL 7
REFL 8
GND 9
V
DD
10
V
DD
11
V
DD
12
48
47
46
45
44
43
42
41
40
39
38
37
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................ –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
36
35
34
33
32
31
30
29
28
27
26
25
GND
D10
D9
D8
GND
OV
DD
OGND
GND
D7
D6
D5
GND
LX PACKAGE
48-LEAD (7mm 7mm) PLASTIC LQFP
T
JMAX
= 150°C,
θ
JA
= 53°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC2246HLX#PBF
LEAD BASED FINISH
LTC2246HLX
TAPE AND REEL
LTC2246HLX#TRPBF
TAPE AND REEL
LTC2246HLX#TR
PART MARKING
LTC2246LX
PART MARKING
LTC2246LX
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic LQFP
PACKAGE DESCRIPTION
48-Lead (7mm
×
7mm) Plastic LQFP
TEMPERATURE RANGE
–40°C to 125°C
TEMPERATURE RANGE
–40°C to 125°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/
CONVERTER CHARACTERISTICS
PARAMETER
Resolution
(No Missing Codes)
Integral Linearity Error
Differential Linearity Error
Offset Error
Gain Error
Offset Drift
Full-Scale Drift
Transition Noise
Internal Reference
External Reference
SENSE = 1V
CONDITIONS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
l
GND 13
CLK 14
GND 15
SHDN 16
OE
17
GND 18
D0 19
D1 20
D2 21
D3 22
D4 23
GND 24
TYP
MAX
UNITS
Bits
14
–6
–1
–15
–3
±1
±0.5
±2
±0.5
±10
±30
±5
1
6
1
15
3
Differential Analog Input (Note 5)
Differential Analog Input
(Note 6)
External Reference
l
l
l
l
LSB
LSB
mV
%FS
μV/°C
ppm/°C
ppm/°C
LSB
RMS
2246hfa
2
LTC2246H
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
SENSE Input Leakage
MODE Pin Leakage
Sample-and-Hold Acquisition Delay Time
Sample-and-Hold Acquisition Delay Time Jitter
Analog Input Common Mode Rejection Ratio
The
l
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
2.8V < V
DD
< 3.5V (Note 7)
Differential Input (Note 7)
Single Ended Input (Note 7)
0V < A
IN+
, A
IN–
< V
DD
0V < SENSE < 1V
l
l
l
l
l
l
MIN
TYP
±0.5V to
±1V
MAX
UNITS
V
1
0.5
–10
–10
–10
1.5
1.5
1.9
2
10
10
10
V
V
μA
μA
μA
ns
ps
RMS
dB
0
0.2
80
DYNAMIC ACCURACY
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)
PARAMETER
Signal-to-Noise Ratio
SYMBOL
SNR
CONDITIONS
5MHz Input
12.5MHz Input
70MHz Input
5MHz Input
12.5MHz Input
70MHz Input
5MHz Input
12.5MHz Input
70MHz Input
5MHz Input
12.5MHz Input
70MHz Input
f
IN1
= 4.3MHz, f
IN2
= 4.6MHz
l
MIN
72
TYP
74.5
74.2
73.4
90
90
85
90
90
90
74.5
74.2
73.4
90
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
SFDR
Spurious Free Dynamic Range
2nd or 3rd Harmonic
Spurious Free Dynamic Range
4th Harmonic or Higher
Signal-to-Noise Plus Distortion Ratio
l
74
SFDR
l
78
S/(N+D)
l
71.5
IMD
Intermodulation Distortion
INTERNAL REFERENCE CHARACTERISTICS
T
A
= 25°C. (Note 4)
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Regulation
2.8V < V
DD
< 3.5V
–1mA < I
OUT
< 1mA
CONDITIONS
I
OUT
= 0
MIN
1.475
TYP
1.500
±25
3
4
MAX
1.525
UNITS
V
ppm/°C
mV/V
Ω
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
I
IN
C
IN
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
CONDITIONS
V
DD
= 3V
V
DD
= 3V
V
IN
= 0V to V
DD
(Note 7)
LOGIC INPUTS (CLK,
OE,
SHDN)
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
l
l
l
TYP
MAX
UNITS
V
2
0.8
–10
3
10
V
μA
pF
2246hfa
3
LTC2246H
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
OV
DD
= 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
1.79
0.09
V
V
High Level Output Voltage
Low Level Output Voltage
I
O
= –200μA
I
O
= 1.6mA
2.49
0.09
V
V
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
= 3V
I
O
= –10μA
I
O
= –200μA
I
O
= 10μA
I
O
= 1.6mA
l
l
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC OUTPUTS
3
50
50
2.7
2.995
2.99
0.005
0.09
0.4
pF
mA
mA
V
V
V
V
POWER REQUIREMENTS
SYMBOL
V
DD
OV
DD
I
VDD
P
DISS
P
SHDN
P
NAP
PARAMETER
Analog Supply Voltage
Output Supply Voltage
Supply Current
Power Dissipation
Shutdown Power
Nap Mode Power
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 8)
CONDITIONS
(Note 9)
(Note 9)
l
l
l
l
MIN
2.8
0.5
TYP
3
3
25
75
2
15
MAX
3.5
3.6
30
90
UNITS
V
V
mA
mW
mW
mW
SHDN = H,
OE
= H, No CLK
SHDN = H,
OE
= L, No CLK
TIMING CHARACTERISTICS
SYMBOL
f
S
t
L
PARAMETER
Sampling Frequency
CLK Low Time
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
Duty Cycle Stabilizer On
(Note 7)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
C
L
= 5pF (Note 7)
C
L
= 5pF (Note 7)
(Note 7)
l
l
l
l
l
MIN
1
18.9
5
18.9
5
TYP
20
20
20
20
0
MAX
25
500
500
500
500
UNITS
MHz
ns
ns
ns
ns
ns
t
H
CLK High Time
t
AP
t
D
Sample-and-Hold Aperture Delay
CLK to DATA Delay
Data Access Time After
OE↓
BUS Relinquish Time
Pipeline Latency
l
l
l
1.4
2.7
4.3
3.3
5
6
12
10
ns
ns
ns
Cycles
2246hfa
4
LTC2246H
ELECTRICAL CHARACTERISTICS
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
= 3V, f
SAMPLE
= 25MHz, 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
= 3V, f
SAMPLE
= 25MHz, input range = 1V
P-P
with
differential drive.
Note 9:
Recommended operating conditions.
TYPICAL PERFORMANCE CHARACTERISTICS
Typical INL, 2V Range, 25Msps
2.0
1.5
1.0
DNL ERROR (LSB)
INL ERROR (LSB)
0.5
0
–0.5
–1.0
–1.5
–2.0
0
4096
8192
CODE
12288
16384
2246H G01
Typical DNL, 2V Range, 25Msps
1.00
0.75
0.50
AMPLITUDE (dB)
0.25
0
–0.25
–0.50
–0.75
–1.00
0
4096
8192
CODE
12288
16384
2246H G02
8192 Point FFT, f
IN
= 5MHz, –1dB,
2V Range, 25Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
2
4
6
8
10
FREQUENCY (MHz)
12
2246H G03
8192 Point FFT, f
IN
= 30MHz,
–1dB, 2V Range, 25Msps
0
–10
–20
–30
AMPLITUDE (dB)
AMPLITUDE (dB)
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
2
4
6
8
10
FREQUENCY (MHz)
12
2246H G04
8192 Point FFT, f
IN
= 70MHz,
–1dB, 2V Range, 25Msps
0
–10
–20
–30
AMPLITUDE (dB)
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
2
4
6
8
10
FREQUENCY (MHz)
12
2246H G05
8192 Point FFT, f
IN
= 140MHz,
–1dB, 2V Range, 25Msps
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
–120
0
2
4
6
8
10
FREQUENCY (MHz)
12
2246H G06
2246hfa
5
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