LTC1415CG#PBF Linear Technology, LTC1415CG#PBF Datasheet - Page 13

• Manufacturer Part Number: LTC1415CG#PBF
• Description: IC A/D CONV 12BIT SAMPLNG 28SSOP
• Manufacturer: Linear Technology

Specifications of LTC1415CG#PBF

• Number Of Bits: 12
• Sampling Rate (per Second): 1.25M
• Data Interface: Parallel
• Number Of Converters: 1
• Power Dissipation (max): 100mW
• Voltage Supply Source: Single Supply
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 28-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

APPLICATIONS
4.096V to 2.048V and shifts the common mode voltage
from half of full scale to 2.274V.
AC Coupled Inputs
The analog inputs can be AC coupled for applications
where the input has no DC information. The input of the
Figure 10c. 2.048V Input Range with a Common Mode
Voltage of 2.274V. For Low Distortion AC Applications
LT1004-1.2
V
OUT
80
70
60
50
40
30
20
10
Figure 10a. CMRR vs Input Frequency
= 1.2V
0
1k
1.25V TO 3.298V
ANALOG INPUT
24
U
Figure 10e. 2.048V
ANALOG INPUT
INPUT FREQUENCY (Hz)
10k
2.048V
INFORMATION
1 F
10 F
U
P-P
1
2
3
4
5
100k
+A
–A
V
REFCOMP
AGND
REF
IN
IN
LTC1415
W
1k
P-P
LTC1415 • F10c
LTC1415 • F10a
1M
Input Range with AC Coupling. For Low Distortion AC Applications
LT1004-1.2
1k
2M
+
–
U
25
9k
1 F
10 F
ADC does need to be DC biased at midscale. Figures 10d
and 10e demonstrate AC coupling and the required bias-
ing. Figure 10d shows the ADC with a full scale of 4.096V,
a common mode voltage of 2.048V and an input that
swings from 0V to 4.096V. This circuit has the lowest
noise (SINAD = 72dB to 100kHz) but will have distortion
1
2
3
4
5
Figure 10b. Shifting the Input Range Up from Ground by 200mV
+A
–A
V
REFCOMP
AGND
ANALOG INPUT
REF
IN
IN
LTC1415
4.096V
Figure 10d. 4.096V
For Low Noise AC Applications
LTC1415 • F10e
P-P
200
R1
ANALOG INPUT
0.2V TO 4.296V
2k
2k
R2
3.9k
10 F
1
2
3
4
5
10 F
P-P
+A
–A
V
REFCOMP
AGND
1
2
3
4
5
REF
Input Range with AC Coupling.
IN
IN
+A
–A
V
REFCOMP
AGND
LTC1415
REF
IN
IN
LTC1415
LTC1415 • F10b
LTC1415 • F10d
LTC1415
13