LTC2293/LTC2292/LTC2291
Dual 12-Bit, 65/40/25Msps
Low Power 3V ADCs
FEATURES
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DESCRIPTIO
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Integrated Dual 12-Bit ADCs
Sample Rate: 65Msps/40Msps/25Msps
Single 3V Supply (2.7V to 3.4V)
Low Power: 400mW/235mW/150mW
71dB SNR up to 70MHz Input
85dB SFDR up to 70MHz Input
110dB Channel Isolation at 100MHz
Multiplexed or Separate Data Bus
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
80Msps: LTC2294 (12-Bit), LTC2299 (14-Bit)
65Msps: LTC2293 (12-Bit), LTC2298 (14-Bit)
40Msps: LTC2292 (12-Bit), LTC2297 (14-Bit)
25Msps: LTC2291 (12-Bit), LTC2296 (14-Bit)
10Msps: LTC2290 (12-Bit), LTC2295 (14-Bit)
64-Pin (9mm
×
9mm) QFN Package
Wireless and Wired Broadband Communication
Imaging Systems
Spectral Analysis
Portable Instrumentation
The LTC
®
2293/LTC2292/LTC2291 are 12-bit 65Msps/
40Msps/25Msps, low power dual 3V A/D converters de-
signed for digitizing high frequency, wide dynamic range
signals. The LTC2293/LTC2292/LTC2291 are perfect for
demanding imaging and communications applications
with AC performance that includes 71dB SNR and 85dB
SFDR for signals well beyond the Nyquist frequency.
DC specs include
±0.3LSB
INL (typ),
±0.15LSB
DNL (typ)
and no missing codes over temperature. The transition
noise is a low 0.25LSB
RMS
.
A single 3V supply allows low power operation. A separate
output supply allows the outputs to drive 0.5V to 3.3V
logic. An optional multiplexer allows both channels to
share a digital output bus.
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.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
APPLICATIO S
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TYPICAL APPLICATIO
+
ANALOG
INPUT A
INPUT
S/H
OV
DD
12-BIT
PIPELINED
ADC CORE
OUTPUT
DRIVERS
D11A
•
•
•
–
D0A
OGND
MUX
CLK B
CLOCK/DUTY CYCLE
CONTROL
SNR (dBFS)
CLK A
CLOCK/DUTY CYCLE
CONTROL
OV
DD
+
ANALOG
INPUT B
INPUT
S/H
–
12-BIT
PIPELINED
ADC CORE
OUTPUT
DRIVERS
D11B
•
•
•
D0B
OGND
229321 TA01
U
LTC2293: SNR vs Input Frequency,
–1dB, 2V Range, 65Msps
72
71
70
69
68
0
100
150
50
INPUT FREQUENCY (MHz)
200
229321 TA02
U
U
229321f
1
LTC2293/LTC2292/LTC2291
ABSOLUTE
AXI U RATI GS
PACKAGE/ORDER I FOR ATIO
TOP VIEW
64 GND
63 V
DD
62 SENSEA
61 VCMA
60 MODE
59 SHDNA
58 OEA
57 OFA
56 DA11
55 DA10
54 DA9
53 DA8
52 DA7
51 DA6
50 OGND
49 OV
DD
OV
DD
= V
DD
(Notes 1, 2)
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
LTC2293C, LTC2292C, LTC2291C ........... 0°C to 70°C
LTC2293I, LTC2292I, LTC2291I ..........–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
Lead Temperature (Soldering, 10 sec).................. 300°C
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 DA5
47 DA4
46 DA3
45 DA2
44 DA1
43 DA0
42 NC
41 NC
40 OFB
39 DB11
38 DB10
37 DB9
36 DB8
35 DB7
34 DB6
33 DB5
UP PACKAGE
64-LEAD (9mm
×
9mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 20°C/W
EXPOSED PAD (PIN 65) IS GND AND MUST BE SOLDERED TO PCB
ORDER PART
NUMBER
LTC2293CUP
LTC2293IUP
LTC2292CUP
LTC2292IUP
LTC2291CUP
LTC2291IUP
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
CO VERTER CHARACTERISTICS
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
CONDITIONS
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
12
–1.4
–0.8
–12
–2.5
LTC2293
TYP
MAX
MIN
12
–1.4
–0.7
–12
–2.5
LTC2292
TYP
MAX
MIN
12
–1.3
–0.7
–12
–2.5
LTC2291
TYP
MAX
UNITS
Bits
LSB
LSB
mV
%FS
µV/°C
ppm/°C
ppm/°C
%FS
mV
LSB
RMS
229321f
Differential Analog Input (Note 5)
Differential Analog Input
(Note 6)
External Reference
Internal Reference
External Reference
External Reference
SENSE = 1V
●
●
●
●
±0.3
±0.15
±2
±0.5
±10
±30
±15
±0.3
±2
0.25
1.4
0.8
12
2.5
GND 17
V
DD
18
SENSEB 19
VCMB 20
MUX 21
SHDNB 22
OEB 23
NC 24
NC 25
DB0 26
DB1 27
DB2 28
DB3 29
DB4 30
OGND 31
OV
DD
32
QFN PART*
MARKING
LTC2293UP
LTC2292UP
LTC2291UP
±0.3
±0.15
±2
±0.5
±10
±30
±15
±0.3
±2
0.25
1.4
0.7
12
2.5
±0.3
±0.15
±2
±0.5
±10
±30
±15
±0.3
±2
0.25
1.3
0.7
12
2.5
2
U
W
U
U
W W
W
U
LTC2293/LTC2292/LTC2291
A ALOG I PUT
SYMBOL
V
IN
V
IN,CM
I
IN
I
SENSE
I
MODE
t
AP
t
JITTER
CMRR
PARAMETER
The
●
denotes the specifications which apply over the full operating temperature range, otherwise
specifications are at T
A
= 25°C. (Note 4)
CONDITIONS
2.7V < V
DD
< 3.4V (Note 7)
Differential Input (Note 7)
0V < A
IN+
, A
IN–
< V
DD
0V < SENSEA, SENSEB < 1V
0V < MODE < V
DD
●
●
●
●
●
Analog Input Range (A
IN+
–A
IN–
)
Analog Input Common Mode
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
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
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
SFDR
Spurious Free
Dynamic Range
2nd or 3rd
Harmonic
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
SFDR
Spurious Free
Dynamic Range
4th Harmonic
or Higher
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
S/(N+D)
Signal-to-Noise
Plus Distortion
Ratio
5MHz Input
12.5MHz Input
20MHz Input
30MHz Input
70MHz Input
140MHz Input
I
MD
Intermodulation
Distortion
Crosstalk
f
IN
= Nyquist,
Nyquist + 1MHz
f
IN
= Nyquist
●
●
●
●
●
●
●
●
●
●
●
●
U
W U
U
MIN
1
–1
–3
–3
TYP
1V to 2V
1.5
MAX
1.9
1
3
3
UNITS
V
V
µA
µA
µA
ns
ps
RMS
dB
MHz
0
0.2
80
Figure 8 Test Circuit
575
LTC2293
MIN
TYP
MAX
71.3
LTC2292
MIN
TYP
MAX
71.4
LTC2291
MIN
TYP
MAX
71.4
70.1
71.2
UNITS
dB
dB
dB
dB
69.6
69.6
71.3
71.3
71
90
74
74
90
85
80
90
79
78
90
90
90
71.3
69.4
69.4
71.2
71.1
69.9
90
–110
71.3
71.1
70.7
90
75
90
85
80
90
80
90
90
90
71.4
69.8
71.2
70.9
69.9
90
–110
70.8
69.8
90
–110
90
90
71.4
71.2
85
80
90
90
70.9
70.6
90
90
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
229321f
3
LTC2293/LTC2292/LTC2291
I TER AL REFERE CE CHARACTERISTICS
PARAMETER
V
CM
Output Voltage
V
CM
Output Tempco
V
CM
Line Regulation
V
CM
Output Resistance
CONDITIONS
I
OUT
= 0
DIGITAL I PUTS A D DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
I
IN
C
IN
LOGIC OUTPUTS
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
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
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Input Current
Input Capacitance
CONDITIONS
V
DD
= 3V
V
DD
= 3V
LOGIC INPUTS (CLK, OE, SHDN, MUX)
The
●
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
MIN
●
●
●
4
U
U
U
U
U
(Note 4)
MIN
1.475
TYP
1.500
±30
3
4
MAX
1.525
UNITS
V
ppm/°C
mV/V
Ω
2.7V < V
DD
< 3.3V
–1mA < I
OUT
< 1mA
TYP
MAX
UNITS
V
2
0.8
–10
3
10
V
µA
pF
V
IN
= 0V to V
DD
(Note 7)
OE = High (Note 7)
V
OUT
= 0V
V
OUT
= 3V
I
O
= –10µA
I
O
= –200µA
I
O
= 10µA
I
O
= 1.6mA
●
●
3
50
50
2.7
2.995
2.99
0.005
0.09
2.49
0.09
1.79
0.09
0.4
pF
mA
mA
V
V
V
V
V
V
V
V
229321f
LTC2293/LTC2292/LTC2291
POWER REQUIRE E TS
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)
The
●
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 8)
LTC2293
MIN
TYP
MAX
●
●
●
●
Both ADCs at f
S(MAX)
Both ADCs at f
S(MAX)
SHDN = H,
OE = H, No CLK
SHDN = H,
OE = L, No CLK
The
●
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 4)
SYMBOL
f
s
t
L
PARAMETER
CLK Low Time
CONDITIONS
●
●
●
●
●
TI I G CHARACTERISTICS
Sampling Frequency (Note 9)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
Duty Cycle Stabilizer Off
Duty Cycle Stabilizer On
(Note 7)
t
H
CLK High Time
t
AP
t
D
t
MD
Sample-and-Hold
Aperture Delay
CLK to DATA Delay
C
L
= 5pF (Note 7)
●
●
●
●
MUX to DATA Delay C
L
= 5pF (Note 7)
Data Access Time
C
L
= 5pF (Note 7)
After OE↓
BUS Relinquish Time (Note 7)
Pipeline
Latency
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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
= 65MHz (LTC2293), 40MHz (LTC2292), or
25MHz (LTC2291), input range = 2V
P-P
with differential drive, unless
otherwise noted.
U W
LTC2292
MIN
TYP
MAX
2.7
0.5
3
3
78
235
2
15
3.4
3.6
95
285
LTC2291
MIN
TYP
MAX
2.7
0.5
3
3
50
150
2
15
3.4
3.6
60
180
UNITS
V
V
mA
mW
mW
mW
2.7
0.5
3
3
133
400
2
15
3.4
3.6
150
450
UW
LTC2293
MIN
TYP
MAX
1
7.3
5
7.3
5
7.7
7.7
7.7
7.7
0
1.4
1.4
2.7
2.7
4.3
3.3
6
5.4
5.4
10
8.5
65
500
500
500
500
LTC2292
MIN
TYP
MAX
1
11.8
5
11.8
5
12.5
12.5
12.5
12.5
0
1.4
1.4
2.7
2.7
4.3
3.3
6
5.4
5.4
10
8.5
40
500
500
500
500
LTC2291
MIN
TYP
MAX
1
18.9
5
18.9
5
20
20
20
20
0
1.4
1.4
2.7
2.7
4.3
3.3
6
5.4
5.4
10
8.5
25
500
500
500
500
UNITS
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
Cycles
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 0000 0000 0000 and 1111 1111 1111.
Note 7:
Guaranteed by design, not subject to test.
Note 8:
V
DD
= 3V, f
SAMPLE
= 65MHz (LTC2293), 40MHz (LTC2292), or
25MHz (LTC2291), 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.
229321f
5
