Datasheet

LTC2255/LTC2254
2
22554fa
ABSOLUTE AXI U RATI GS
W
WW
U
PACKAGE/ORDER I FOR ATIO
UUW
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
LTC2255C, LTC2254C ............................. 0°C to 70°C
LTC2255I, LTC2254I ...........................–40°C to 85°C
Storage Temperature Range ..................–65°C to 125°C
ORDER PART
NUMBER
QFN PART*
MARKING
T
JMAX
= 125°C, θ
JA
= 34°C/W
EXPOSED PAD (PIN 33) IS GND
MUST BE SOLDERED TO PCB
2255
2254
LTC2255CUH
LTC2255IUH
LTC2254CUH
LTC2254IUH
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*The temperature grade is identified by a label on the shipping container.
32 31 30 29 28 27 26 25
9 10 11 12
TOP VIEW
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
13 14 15 16
17
18
19
20
21
22
23
24
8
7
6
5
4
3
2
1AIN
+
AIN
–
REFH
REFH
REFL
REFL
V
DD
GND
D10
D9
D8
OV
DD
OGND
D7
D6
D5
V
DD
V
CM
SENSE MODE OF D13 D12 D11
CLK
SHDN
OE D0 D1 D2 D3 D4
33
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. (Note 4)
LTC2255 LTC2254
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX UNITS
Resolution (No Missing Codes) ● 14 14 Bits
Integral Linearity Error Differential Analog Input (Note 5) ● –5 ±1 5 –5.5 ±1 5.5 LSB
Differential Linearity Error Differential Analog Input ● –1 ±0.5 1 –1 ±0.5 1 LSB
Offset Error (Note 6) ● –12 ±212–12±212 mV
Gain Error External Reference ● –2.5 ±0.5 2.5 –2.5 ±0.5 2.5 %FS
Offset Drift ±10 ±10 µV/°C
Full-Scale Drift Internal Reference ±30 ±30 ppm/°C
External Reference ±5 ±5 ppm/°C
Transition Noise SENSE = 1V 1.3 1.3 LSB
RMS
CO VERTER CHARACTERISTICS
U
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/