LTC1417ACGN Linear Technology, LTC1417ACGN Datasheet - Page 27

• Manufacturer Part Number: LTC1417ACGN
• Description: IC A/D CONV 14BIT SAMPLNG 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC1417ACGN

• Number Of Bits: 14
• Sampling Rate (per Second): 400k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 27.5mW Unipolar; 44mW Bipolar
• Voltage Supply Source: Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP (0.150", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

TYPICAL APPLICATIONS
Figure 23 uses the DG408 to select one of eight 2.048V
bipolar signals and apply it to the LTC1417’s analog input.
The circuit is designed to connect to a 68HC11 C. The
MUX’s parallel input is connected to the controller’s port
C and the LTC1417’s serial interface is accessed through
the controller’s SPI interface.
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
1
2
3
4
5
6
7
8
S1
S2
S3
S4
S5
S6
S7
S8
DG408
Figure 23. With an Input Range of 2.048V for Each of Eight Inputs,
This Data Acquisition System is Configured for Communication with the 68HC11 C
GND
V
V
EN
A2
A1
A0
D
+
–
13
3
14
2
U
5V
0.1 F
– 5V
0.1 F
10 F
1 F
NC
5V
The sequence to generate a conversion is shown in sample
program Listing B. The first step selects a MUX channel.
This is followed by initiating a conversion and waiting for
BUSY to go high, signifying end of conversion. Once BUSY
goes low, the SPI is used to retrieve the 14-bit conversion
data. The timing relationships between the various control
signals and data transmission are shown in Figure 24.
1
2
3
4
5
6
7
8
A
A
V
REFCOMP
AGND
EXTCLKIN
SCLK
CLKOUT
IN
IN
REF
+
–
LTC1417
CONVST
SHDN
DGND
BUSY
D
V
V
OUT
RD
DD
SS
16
15
14
13
12
11
10
9
5V
– 5V
PORT C, BIT 7
PORT C, BIT 6
SS
MISO
CLK
PORT C, BIT 2
PORT C, BIT 1
PORT C, BIT 0
MC68HC11
LTC1417
1417 F23
sn1417 1417fas
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