LTC6268/LTC6269
24
62689f
For more information www.linear.com/LTC6268
LINEAR TECHNOLOGY CORPORATION 2014
LT 0914 • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC6268
RELATED PARTS
TYPICAL APPLICATION
PART NUMBER DESCRIPTION COMMENTS
Op Amps
LTC6244 Dual 50MHz, Low Noise, Rail-to-Rail, CMOS Op Amp Unity Gain Stable, 1pA Input Bias Current, 100μV Max Offset.
LTC6240/LTC6241/
LTC6242
18MHz, Low Noise, Rail-to-Rail Output, CMOS Op Amp 18MHz GBW, 0.2pA Input Current, 125μV Max Offset.
LTC6252/LTC6253/
LTC6254
720MHz, 3.5mA Power Efficient Rail-to-Rail I/O Op Amp 720MHz GBW, Unity Gain Stable, Low Noise
LTC6246/LTC6247/
LTC6248
180MHz, 1mA Power Efficient Rail-to-Rail I/O Op Amps 180MHz GBW, Unity Gain Stable, Low Noise
LT1818 400MHz, 2500V/µs, 9mA Single Operational Amplifier Unity Gain Stable, 6nV/√Hz Unity Gain Stable
LT6230 215MHz, Rail-to-Rail Output, 1.1nV/√Hz, 3.5mA Op Amp Family 350μV Max Offset Voltage, 3V to 12.6V Supply
LT6411 650MHz Differential ADC Driver/Dual Selectable Amplifier SR 3300V/µs, 6ns 0.1% Settling.
SAR ADC
LTC2376-18/
LTC2377-18/
LTC2378-18/
LTC2379-18
18-Bit, 250ksps to 1.6Msps, Low Power SAR ADC, 102dB SNR 18mW at 1.6Msps, 3.4μW at 250sps, –126dB THD.
LTC6268 as a High-Z Buffer Driving an LT1395 as a
Single-Ended to Differential Converter Into a 16-Bit ADC
Reconstructed Sampled Time Domain
Response of Above Circuit
A
IN
+
A
IN
–
LTC2269
1.8V
D15
D0
V
DD
1.8V
OV
DD
• • •
LTC2269 16-BIT 20 Msps ADC
V
CM
10MHz
CLOCK
CLOCK
CONTROL
OUTPUT
DRIVERS
OGNDGND
16-BIT
ADC CORE
LTC6655-2.048
V
IN
V
OUT_s
V
OUT_F
GND
SHDN
V
IN
V
IN
= 2.048V
±1.7V FS
V
REF
R2
75Ω
R1
49.9Ω
R6
100Ω
R7
100Ω
R4
49.9Ω
R10
75Ω
R16
49.9Ω
R17
49.9Ω
R15
402Ω
R13
825Ω
R18
49.9Ω
R11
75Ω
R8
200Ω
L4
100nH
L3
100nH
C5
.01µF
R14
402Ω
R12
825Ω
R5
49.9Ω
R9
200Ω
C2
10pF
C3
10pF
C4
100µF
C
IN
0.1µF
C4
0.1µF
L1
100nH
L2
100nH
+V
+V
R3
10M
C1
22pF
U1
+
–
LTC6268
LT1395
U2
+V
+V = 5V
–V = –5V
–V
+
–
–
+
–
+
S/H
TIME (10ns/DIV)
f
S
= 10Msps
f
IN
= 10.101MHz
0
ADC OUTPUTS (COUNTS)
60k
52k
56k
36k
44k
48k
40k
4k
8k
12k
16k
20k
24k
28k
32k
64k
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