LTC2259CUJ-14#TRPBF Linear Technology, LTC2259CUJ-14#TRPBF Datasheet - Page 18

• Manufacturer Part Number: LTC2259CUJ-14#TRPBF
• Description: IC ADC 14BIT 80MSPS 40-QFN
• Manufacturer: Linear Technology

Specifications of LTC2259CUJ-14#TRPBF

• Number Of Bits: 14
• Sampling Rate (per Second): 80M
• Data Interface: Serial, Parallel
• Number Of Converters: 1
• Power Dissipation (max): 105mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC2261-14
LTC2260-14/LTC2259-14
18
APPLICATIONS INFORMATION
DC level. At higher input frequencies a transmission line
balun transformer (Figures 4 to 6) has better balance,
resulting in lower A/D distortion.
Amplifi er Circuits
Figure 7 shows the analog input being driven by a high
speed differential amplifi er. The output of the amplifi er is
AC-coupled to the A/D so the amplifi er’s output common
mode voltage can be optimally set to minimize distortion.
ANALOG
INPUT
T1: MA/COM MABA-007159-000000
T2: MA/COM MABAES0060
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
0.1μF
0.1μF
Figure 4. Recommended Front-End Circuit for
Input Frequencies from 70MHz to 170MHz
T1
T2
25Ω
25Ω
0.1μF
50Ω
0.1μF
4.7pF
V
A
A
CM
IN
IN
+
–
LTC2261-14
226114 F04
ANALOG
At very high frequencies an RF gain block will often have
lower distortion than a differential amplifi er. If the gain
block is single-ended, then a transformer circuit (Figures 4
to 6) should convert the signal to differential before driv-
ing the A/D.
INPUT
ANALOG
T1: MA/COM MABA-007159-000000
T2: COILCRAFT WBC1-1LB
RESISTORS, CAPACITORS ARE 0402 PACKAGE SIZE
INPUT
0.1μF
0.1μF
Figure 6. Recommended Front-End Circuit for
Input Frequencies Above 270MHz
Figure 5. Recommended Front-End Circuit for
Input Frequencies from 170MHz to 270MHz
0.1μF
0.1μF
T1
T1: MA/COM ETC1-1-13
RESISTORS, CAPACITORS
ARE 0402 PACKAGE SIZE
T1
T2
25Ω
25Ω
50Ω
2.7nH
2.7nH
25Ω
25Ω
0.1μF
0.1μF
50Ω
0.1μF
V
A
A
CM
IN
IN
+
–
LTC2261-14
0.1μF
1.8pF
V
A
A
CM
IN
IN
+
–
226114 F06
LTC2261-14
226114fa
226114 F05