REFBUF .........................(GND – 0.3V) to (V
DD
+ 0.3V)
REFIN (Note 4) ...........................(GND – 0.3V) to 2.8V
Digital Input Voltage (Note 3)
PD,
TESTPAT ............. (GND – 0.3V) to (OV
DD
+ 0.3V)
CLK
+
, CLK
–
................ (GND – 0.3V) to (OV
DD
+ 0.3V)
TWOLANES, CNV
+
,
CNV
–
...........................(GND – 0.3V) to (V
DDL
+ 0.3V)
Power Dissipation .............................................. 500mW
Operating Temperature Range
LTC2385C ................................................ 0°C to 70°C
LTC2385I .............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
CNV
+
CNV
–
V
DDL
V
DDL
GND
32 31 30 29 28 27 26 25
GND 1
IN
+
2
IN
–
3
GND 4
REFGND 5
REFGND 6
REFBUF 7
REFBUF 8
UH PACKAGE
32-LEAD (5mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LTC2385CUH-18#PBF
LTC2385IUH-18#PBF
TAPE AND REEL
LTC2385CUH-18#TRPBF
LTC2385IUH-18#TRPBF
PART MARKING*
238518
238518
PACKAGE DESCRIPTION
32-Lead (5mm × 5mm) Plastic QFN
32-Lead (5mm × 5mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°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.
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–
V
IN+
– V
IN–
V
INCM
I
IN
C
IN
CMRR
PARAMETER
Absolute Input Range (IN
+
)
Absolute Input Range (IN
–
)
Input Differential Voltage Range
Common Mode Input Range
Analog Input DC Leakage Current
Analog Input Capacitance
Input Common Mode Rejection Ratio
Sample Mode
Hold Mode
f
IN
= 1MHz
CONDITIONS
(Note 6)
(Note 6)
V
IN+
– V
IN–
(V
IN+
+ V
IN–
)/2
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
–0.1
–0.1
–V
REFBUF
V
REFBUF
/2 – 0.1
–1
TYP
GND
V
CM
MAX
V
REFBUF
+ 0.1
V
REFBUF
+ 0.1
V
REFBUF
UNITS
V
V
V
V
μA
pF
pF
dB
V
REFBUF
/2
20
2
75
V
REFBUF
/2 + 0.1
1
238518f
2
For more information
www.linear.com/LTC2385-18
LTC2385-18
CONVERTER CHARACTERISTICS
SYMBOL
PARAMETER
Resolution
No Missing Codes
Transition Noise
INL
DNL
ZSE
FSE
Integral Linearity Error
Differential Linearity Error
Zero-Scale Error
Zero-Scale Error Drift
Full-Scale Error
Full-Scale Error Drift
REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9)
REFIN = 2.048V (REFIN Overdriven) (Note 8)
REFBUF = 4.096V (REFBUF Overdriven) (Note 9)
REFIN = 2.048V (REFIN Overdriven)
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
l
l
MIN
18
18
TYP
MAX
UNITS
Bits
Bits
1.4
REFBUF = 4.096V (Notes 7, 9)
(Note 8)
l
l
l
LSB
RMS
1.5
0.9
10
20
160
LSB
LSB
LSB
LSB/°C
LSB
LSB
ppm/°C
ppm/°C
–1.5
–0.9
–10
–20
–160
±0.6
±0.2
±1.5
0.02
±5
±25
±0.1
±1.5
DYNAMIC ACCURACY
SYMBOL
SINAD
SNR
THD
SFDR
PARAMETER
The
l
denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T
A
= 25°C and A
IN
= –1dBFS. (Notes 5, 10)
CONDITIONS
f
IN
= 2kHz
f
IN
= 1MHz
f
IN
= 2kHz
f
IN
= 1MHz
f
IN
= 2kHz
f
IN
= 1MHz
f
IN
= 2kHz
f
IN
= 1MHz
l
l
l
l
l
l
l
l
MIN
93.8
92.7
94
93.2
TYP
96
94.6
96.2
95.7
–117
–100
MAX
UNITS
dB
dB
dB
dB
Signal-to-(Noise + Distortion) Ratio
Signal-to-Noise Ratio
Total Harmonic Distortion
(First Five Harmonics)
Spurious Free Dynamic Range
–3dB Input Bandwidth
–108
–97
dB
dB
dB
dB
MHz
108
97
119
101
200
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
REFIN
PARAMETER
Internal Reference Output Voltage
V
REFIN
Temperature Coefficient
REFIN Output Impedance
V
REFIN
Line Regulation
REFIN Input Voltage Range
V
DD
= 4.75V to 5.25V
(REFIN Overdriven) (Note 6)
l
INTERNAL REFERENCE CHARACTERISTICS
CONDITIONS
I
OUT
= 0μA
(Note 11)
MIN
2.043
l
TYP
2.048
±5
15
0.3
MAX
2.053
±20
UNITS
V
ppm/°C
kΩ
mV/V
2.008
2.048
2.088
V
238518f
For more information
www.linear.com/LTC2385-18
3
LTC2385-18
The
l
denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL PARAMETER
V
REFBUF
I
REFBUF
V
CM
CONDITIONS
l
l
l
REFERENCE BUFFER CHARACTERISTICS
Reference Buffer Output Voltage V
REFIN
= 2.048V
REFBUF Input Voltage Range
(REFBUF Overdriven) (Notes 6, 9)
REFBUF Load Current
Common Mode Output
V
CM
Output Impedance
MIN
4.090
4.016
TYP
4.096
4.096
0.9
0.5
MAX
4.102
4.176
1.1
2.068
UNITS
V
V
mA
mA
V
Ω
V
REFBUF
= 4.096V (REFBUF Overdriven) (Notes 9, 12)
V
REFBUF
= 4.096V, Sleep Mode (REFBUF Overdriven) (Note 9)
V
REFBUF
= 4.096V, I
OUT
= 0μA
–1mA < I
OUT
< 1mA
2.028
l
2.048
15
DIGITAL INPUTS AND DIGITAL OUTPUTS
SYMBOL
V
IH
V
IL
I
IN
C
IN
V
IH
V
IL
C
IN
V
ID
V
ICM
V
ID
V
ICM
V
OD
V
OS
PARAMETER
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Input Voltage
Low Level Input Voltage
Digital Input Capacitance
Differential Input Voltage
Common Mode Input Voltage
Differential Input Voltage
Common Mode Input Voltage
Differential Output Voltage
Common Mode Output Voltage
(Note 13)
(Note 13)
V
DDL
= 2.5V
V
DDL
= 2.5V
CONDITIONS
V
DDL
= OV
DD
= 2.5V
V
DDL
= OV
DD
= 2.5V
V
IN
= 0V to 2.5V
PD,
TESTPAT, TWOLANES
The
l
denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
MIN
l
l
l
TYP
MAX
UNITS
V
1.7
0.6
–10
3
10
V
μA
pF
V
CNV
+
, Single-Ended Convert Start Mode (CNV
–
Tied to GND)
l
l
1.7
0.6
2
V
pF
CNV
+
/CNV
–
, Differential Convert Start Mode
l
l
175
0.8
175
0.8
247
1.125
350
1.25
350
1.25
350
1.25
650
1.7
650
1.7
454
1.375
mV
V
mV
V
mV
V
CLK
+
/CLK
–
(LVDS Clock Input)
l
l
DCO
+
/DCO
–
, DA
+
/DA
–
, DB
+
/DB
–
(LVDS Outputs)
100Ω Differential Load
100Ω Differential Load
l
l
POWER REQUIREMENTS
SYMBOL
V
DD
V
DDL
OV
DD
I
VDD
I
VDDL
I
OVDD
I
POWERDOWN
I
POWERDOWN
P
D
I
DIFFCNV
I
TWOLANE
PARAMETER
Supply Voltage
Supply Voltage
Supply Voltage
Supply Current
Supply Current
Supply Current
Power-Down Mode Current
Power-Down Mode Current
Power Dissipation
Power-Down Mode
The
l
denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T
A
= 25°C. (Note 5)
CONDITIONS
(Note 6)
(Note 6)
(Note 6)
5Msps Sample Rate
5Msps Sample Rate
5Msps Sample Rate
Power-Down Mode (I
VDD
)
Power-Down Mode (I
VDDL
+ I
OVDD
)
5Msps Sample Rate
Power-Down Mode (I
VDD
+ I
VDDL
+ I
OVDD
)
l
l
l
l
l
l
l
l
l
l
MIN
4.75
2.375
2.375
TYP
5
2.5
2.5
3
17.1
8.1
1
2
78
10
2.1
3.6
MAX
5.25
2.625
2.625
3.8
19.6
9.6
20
250
92
725
UNITS
V
V
V
mA
mA
mA
μA
μA
mW
μW
mA
mA
238518f
Increase in I
VDDL
with Differential CNV Mode Enabled (No Increase During Power-Down)
Increase in I
OVDD
with Two-Lane Mode Enabled (No Increase During Power-Down)
4
For more information
www.linear.com/LTC2385-18
LTC2385-18
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 5)
SYMBOL
f
SMPL
t
CONV
t
ACQ
t
CYC
t
CNVH
t
CNVL
t
FIRSTCLK
t
LASTCLK
t
CLKH
t
CLKL
t
CLKDCO
t
CLKD
t
SKEW
t
AP
t
JITTER
PARAMETER
Sampling Frequency
CNV↑ to Output Data Ready
Acquisition Time
Time Between Conversions
CNV High Time
CNV Low Time
CNV↑ to First CLK↑ from the Same Conversion
CNV↑ to Last CLK↓ from the Previous
Conversion
CLK High Time
CLK Low Time
CLK to DCO Delay
CLK to DA/DB Delay
DCO to DA/DB skew
Sampling Delay Time
Sampling Delay Jitter
(Note 13)
(Note 13)
t
CLKD
– t
CLKDCO
(Note 13)
(Note 13)
(Note 13)
(Note 13)
(Note 13)
(Note 13)
(Note 13)
l
l
l
l
l
ADC TIMING CHARACTERISTICS
CONDITIONS
l
l
MIN
0.02
88
200
5
8
104
TYP
94
t
CYC
– 67
MAX
5
101
50,000
UNITS
Msps
ns
ns
ns
ns
ns
ns
83
1.25
1.25
0.7
0.7
–200
1.3
1.3
0
0
0.25
2.3
2.3
200
ns
ns
ns
ns
ns
ps
ns
ps
RMS
l
l
l
l
l
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.
Note 3:
When these pin voltages are taken below ground or above V
DD
,
V
DDL
or OV
DD
, they will be clamped by internal diodes. This product can
handle input currents up to 100mA below ground or above V
DD
, V
DDL
or
OV
DD
without latchup.
Note 4:
When this pin voltage is taken below ground, it will be clamped by
an internal diode. When this pin voltage is taken above V
DDL
, it is clamped
by a diode in series with a 2k resistor. This product can handle input
currents up to 100mA below ground without latchup.
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