LTC1402CGN Linear Technology, LTC1402CGN Datasheet - Page 22

• Manufacturer Part Number: LTC1402CGN
• Description: IC ADC 12BIT 2.2MSPS SHDN 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC1402CGN

• Number Of Bits: 12
• Sampling Rate (per Second): 2.2M
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 150mW
• Voltage Supply Source: Analog and Digital, 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

LTC1402
TYPICAL
Using Quad Cable Drivers/Receivers in Remote
LTC1402 Applications
In some applications, the host controller or main proces-
sor may be located some distance from the sensor, the
signal conditioning circuitry, and the ADC. In these appli-
cations, maintaining serial data integrity over long cable
distances can be a challenge. The circuit in Figure 15
shows one way to convey the LTC1402’s high-speed serial
data over a long distance. The circuit uses the LTC1688
quad cable driver and an LTC1520 quad cable receiver to
transmit/receive the LTC1402’s high-speed 35.2Mbps
serial data to the DSPs serial port over category-5
22
35.2MHz
2.2Msps
SIGNAL
CONV
CLK
APPLICATION
3
4
Figure 15. The LTC1402 3-Wire Serial Port Sends Data Over 100 Feet of Category-5
Twisted Pair with the LTC1688/LTC1520 Quad Driver/Receiver Pairs
A
A
IN
IN
LTC1402
+
–
DV
DD
OGND
CONV
0V
D
SCK
OUT
DD
11
16
15
10
9
U
10 F
15
12
QUAD DRIVER
1
7
9
4
16
5V
LTC1688
8
14
6
10
2
5
11
3
13
100
100
100
PIN 4 = ENA
PIN12 = ENB
unshielded cable. Using these devices, the LTC1402’s
serial data can be transmitted up to 100 feet without data
corruption. Because the SCK, CONV and D
originate at the LTC1402, they arrive at the serial port with
similar delays and remain synchronized. When the data is
received at the serial port of the DSP or other controller,
the port must be programmed to respond to the appropri-
ate SCK and CONV edges. It is also necessary to check
where the 12-bit output DATA resides in the 16-bit data
frame. The TMS320C54x serial port READ instructions
can shift the 12-bit data to the preferred position within the
16-bit data frame.
UNSHIELDED CABLE
REMEE PART NO.
5A244UTPM30BU
UP TO 100 FEET
CATEGORY-5
100
100
100
QUAD RECEIVER
14
10
15
2
1
6
7
9
LTC1520
16
4
8
11
13
3
5
BFSR
BCLKR
BDR
TMS320C54x
GND
V
5V
DD
OUT
signals