LTC1096IS8 Linear Technology, LTC1096IS8 Datasheet - Page 29

• Manufacturer Part Number: LTC1096IS8
• Description: IC A/D CONV 8BIT SRL IN/OUT8SOIC
• Manufacturer: Linear Technology

Specifications of LTC1096IS8

• Number Of Bits: 8
• Sampling Rate (per Second): 33k
• Data Interface: Serial
• Number Of Converters: 1
• Power Dissipation (max): 600µW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Remote or Isolated Systems
Figure 16 shows a fl oating system that sends data to a
grounded host system. The fl oating circuitry is isolated by
two optoisolators and powered by a simple capacitor diode
charge pump. The system has very low power requirements
because the LTC1096 shuts down between conversions
Figure 16. Power for This Floating A/D System Is Provided by a Simple Capacitor Diode Charge Pump. The Two Optoisolators
Draw No Current Between Samples, Turning On Only to Send the Clock and Receive Data
DATA
CLK
300Ω
500k
10k
5MHz
0.001μF
2kV
100k
1N5817
1N5817
2N3904
+
0.022μF
47μF
and the optoisolators draw power only when data is being
transferred. The system consumes only 50μA at a sample
rate of 10Hz (1ms on-time and 99ms off-time). This is
easily within the current supplied by the charge pump
running at 5MHz. If a truly isolated system is required,
the system’s low power simplifi es generating an isolated
supply or powering the system from a battery.
FLOATING SYSTEM
100k
1N5817
0.1μF
20k
CS
CLK
LTC1096
GND
V
LTC1096/LTC1096L
LTC1098/LTC1098L
CC
D
V
OUT
+IN
–IN
REF
ANALOG
INPUT
1k
75k
LT1004-2.5
10968 F16
29
10968fc