REFIN.................................................... –0.3V to 2.8V
REFBUF, CNV (Note 4) ............. –0.3V to (V
DD
+ 0.3V)
Digital Input Voltage (Note 4)..... –0.3V to (OV
DD
+ 0.3V)
Digital Output Voltage (Note 4) .. –0.3V to (OV
DD
+ 0.3V)
Power Dissipation .............................................. 500mW
Operating Temperature Range
LTC2345C ................................................ 0°C to 70°C
LTC2345I .............................................–40°C to 85°C
LTC2345H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
1
2
3
4
5
6
7
8
9
10
11
12
49
GND
36
35
34
33
32
31
30
29
28
27
26
25
SDO7
SDO–/SDO6
SDO+/SDO5
SCKO–/SDO4
SCKO+/SCKO
OV
DD
GND
SCKI–/SCKI
SCKI+/SDO3
SDI–/SDO2
SDI+/SDO1
SDO0
T
JMAX
= 150°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB
orDer inForMaTion
LEAD FREE FINISH
LTC2345CUK-18#PBF
LTC2345IUK-18#PBF
LTC2345HUK-18#PBF
TAPE AND REEL
LTC2345CUK-18#TRPBF
LTC2345IUK-18#TRPBF
LTC2345HUK-18#TRPBF
PART MARKING*
LTC2345UK-18
LTC2345UK-18
LTC2345UK-18
PACKAGE DESCRIPTION
48-Lead (7mm × 7mm) Plastic QFN
48-Lead (7mm × 7mm) Plastic QFN
48-Lead (7mm × 7mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°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/.
Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
IN0–
IN0+
GND
GND
GND
GND
REFIN
GND
REFBUF
PD
LVDS/CMOS
CNV
UK PACKAGE
48-LEAD (7mm
×
7mm) PLASTIC QFN
13
14
15
16
17
18
19
20
21
22
23
24
234518f
2
For more information
www.linear.com/LTC2345-18
LTC2345-18
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL
V
IN
+
V
IN
–
PARAMETER
Absolute Input Range
(IN0
+
to IN7
+
)
Absolute Input Range
(IN0
–
to IN7
–
)
CONDITIONS
(Note 6)
(Note 6)
SoftSpan 7: ±V
REFBUF
Range (Note 6)
SoftSpan 6: ±V
REFBUF
/1.024 Range (Note 6)
SoftSpan 5: 0V to V
REFBUF
Range (Note 6)
SoftSpan 4: 0V to V
REFBUF
/1.024 Range (Note 6)
SoftSpan
3: ±0.5 •
V
REFBUF
Range (Note 6)
SoftSpan
2: ±0.5 •
V
REFBUF
/1.024 Range (Note 6)
SoftSpan 1: 0V to
0.5 •
V
REFBUF
Range (Note 6)
l
l
l
l
l
l
l
l
l
l
l
l
elecTrical characTerisTics
MIN
0
0
– V
REFBUF
– V
REFBUF
/1.024
0
0
–0.5 •
V
REFBUF
–0.5 •
V
REFBUF
/1.024
0
0
−V
DD
–1
TYP
MAX
V
DD
V
DD
V
REFBUF
V
REFBUF
/1.024
V
REFBUF
V
REFBUF
/1.024
0.5 •
V
REFBUF
0.5 •
V
REFBUF
/1.024
0.5 •
V
REFBUF
V
DD
V
DD
1
UNITS
V
V
V
V
V
V
V
V
V
V
V
µA
pF
pF
dB
V
V
IN
+ – V
IN
– Input Differential Voltage
Range
V
CM
Input Common Mode Voltage (Note 6)
Range
(Note 7)
V
IN
+ – V
IN
– Input Differential Overdrive
Tolerance
I
IN
C
IN
CMRR
V
IHCNV
V
ILCNV
I
INCNV
Analog Input Leakage Current
Analog Input Capacitance
Input Common Mode
Rejection Ratio
CNV High Level Input Voltage
CNV Low Level Input Voltage
CNV Input Current
Sample Mode
Hold Mode
V
IN
+ = V
IN
− = 3.6V
P-P
200Hz Sine
l
l
l
50
10
84
1.3
0.5
–10
10
102
V
μA
V
IN
= 0V to V
DD
l
temperature range, otherwise specifications are at T
A
= 25°C. (Note 8)
SYMBOL
PARAMETER
Resolution
No Missing Codes
Transition Noise
CONDITIONS
converTer characTerisTics
The
l
denotes the specifications which apply over the full operating
MIN
l
l
TYP
MAX
UNITS
Bits
Bits
18
18
2.3
4.6
4.6
9.0
SoftSpans 7 and 6: ±4.096V and ±4V Ranges
SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges
SoftSpans 3 and 2: ±2.048V and ±2V Ranges
SoftSpan 1: 0V to 2.048V Range
SoftSpans 7 and 6: ±4.096V and ±4V Ranges (Note 9)
SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges (Note 9)
SoftSpans 3 and 2: ±2.048V and ±2V Ranges (Note 9)
SoftSpan 1: 0V to 2.048V Range (Note 9)
(Note 11)
(Note 11)
l
l
l
l
l
l
LSB
RMS
LSB
RMS
LSB
RMS
LSB
RMS
5
5
6
6
0.9
750
0.13
LSB
LSB
LSB
LSB
LSB
μV
μV/°C
%FS
ppm/°C
INL
Integral Linearity Error
–5
–5
–6
–6
−0.9
−750
−0.13
±1.5
±1.5
±1.5
±2.0
±0.5
±50
±2
±0.025
±2.5
DNL
ZSE
FSE
Differential Linearity Error (Note 10)
Zero-Scale Error
Zero-Scale Error Drift
Full-Scale Error
Full-Scale Error Drift
l
234518f
For more information
www.linear.com/LTC2345-18
3
LTC2345-18
DynaMic accuracy
SYMBOL PARAMETER
SINAD
Signal-to-(Noise +
Distortion) 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. (Notes 8, 12)
CONDITIONS
SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f
IN
= 2kHz
SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f
IN
= 2kHz
SoftSpans 3 and 2: ±2.048V and ±2V Ranges, f
IN
= 2kHz
SoftSpan 1: 0V to 2.048V Range, f
IN
= 2kHz
SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f
IN
= 2kHz
SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f
IN
= 2kHz
SoftSpans 3 and 2: ±2.048V and ±2V Ranges, f
IN
= 2kHz
SoftSpan 1: 0V to 2.048V Range, f
IN
= 2kHz
SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f
IN
= 2kHz
SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f
IN
= 2kHz
SoftSpans 3 and 2: ±2.048V and ±2V Ranges, f
IN
= 2kHz
SoftSpan 1: 0V to 2.048V Range, f
IN
= 2kHz
SoftSpans 7 and 6: ±4.096V and ±4V Ranges, f
IN
= 2kHz
SoftSpans 5 and 4: 0V to 4.096V and 0V to 4V Ranges, f
IN
= 2kHz
SoftSpans 3 and 2: ±2.048 and ±2V Ranges, f
IN
= 2kHz
SoftSpan 1: 0V to 2.048V Range, f
IN
= 2kHz
One Channel Converting 3.6V
P-P
200Hz Sine in ±2.048V Range,
Crosstalk to All Other Channels
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
87.3
81.4
81.5
75.7
87.6
81.6
81.7
75.8
TYP
91.8
85.7
85.9
80.1
91.8
85.7
85.9
80.1
–113
–108
–107
–108
MAX
UNITS
dB
dB
dB
dB
dB
dB
dB
dB
SNR
Signal-to-Noise Ratio
THD
Total Harmonic Distortion
–99
–96
–97
–96
dB
dB
dB
dB
dB
dB
dB
dB
dB
MHz
ns
ps
ps
RMS
ns
SFDR
Spurious Free Dynamic
Range
99
96
97
97
114
109
108
108
−107
31
1
150
3
Channel-to-Channel
Crosstalk
–3dB Input Bandwidth
Aperture Delay
Aperture Delay Matching
Aperture Jitter
Transient Response
Full-Scale Step, 0.005% Settling
200
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 8)
SYMBOL
V
REFIN
PARAMETER
Internal Reference Output Voltage
Internal Reference Temperature Coefficient
Internal Reference Line Regulation
Internal Reference Output Impedance
V
REFIN
REFIN Voltage Range
REFIN Overdriven (Note 6)
(Note 13)
V
DD
= 4.75V to 5.25V
CONDITIONS
inTernal reFerence characTerisTics
The
l
denotes the specifications which apply over the full
MIN
2.043
l
TYP
2.048
5
0.1
20
MAX
2.053
20
UNITS
V
ppm/°C
mV/V
kΩ
1.25
2.2
V
234518f
4
For more information
www.linear.com/LTC2345-18
LTC2345-18
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
REFBUF
PARAMETER
Reference Buffer Output Voltage
REFBUF Voltage Range
REFBUF Input Impedance
I
REFBUF
REFBUF Load Current
CONDITIONS
REFIN Overdriven, V
REFIN
= 2.048V
REFBUF Overdriven (Notes 6, 14)
V
REFIN
= 0V, Buffer Disabled
V
REFBUF
= 5V, 8 Channels Enabled (Notes 14, 15)
V
REFBUF
= 5V, Acquisition Mode (Note 14)
l
l
l
reFerence buFFer characTerisTics
MIN
4.091
2.5
TYP
4.096
13
1.5
0.39
MAX
4.101
5
1.9
UNITS
V
V
kΩ
mA
mA
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
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