LTC1096IS8 Linear Technology, LTC1096IS8 Datasheet - Page 21

• 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

APPLICATIONS INFORMATION
BOARD LAYOUT CONSIDERATIONS
Grounding and Bypassing
The LTC1096(L)/LTC1098(L) should be used with an analog
ground plane and single point grounding techniques. The
GND pin should be tied directly to the ground plane.
(Figure 6) and connect the center point to the MPU input.
It should be noted that to get full shutdown, the CS input
of the LTC1096/LTC1098 must be driven to the V
age. This would require adding a level shift circuit to the
CS signal in Figure 6.
COMMON MODE RANGE
DIFFERENTIAL INPUTS
Figure 6. Interfacing a 9V Powered LTC1096 to a 5V System
LEVEL SHIFT
0V TO 6V
OPTIONAL
"+" INPUT
"–" INPUT
D
CLK
OUT
D
CS
IN
CS
+IN
–IN
GND
9V
LTC1096
D
V
CLK
V
OUT
REF
CC
9V
50k
6V
4.7μF
Figure 7. LTC1098(L) “+” and “–” Input Settling Windows
50k
P1.4
P1.3
P1.2
(e.g. 8051)
START
MPU
CC
10968 F06
volt-
5V
SGL/DIFF
The V
a 1μF tantalum with leads as short as possible. If power
supply is clean, the LTC1096(L)/LTC1098(L) can also oper-
ate with smaller 0.1μF surface mount or ceramic bypass
capacitors. All analog inputs should be referenced directly
to the single point ground. Digital inputs and outputs should
be shielded from and/or routed away from the reference
and analog circuitry.
SAMPLE-AND-HOLD
Both the LTC1096(L) and the LTC1098(L) provide a built-in
sample-and-hold (S&H) function to acquire signals. The
S&H of the LTC1096(L) acquires input signals from “+”
input relative to “–” input during the t
Figure 1). However, the S&H of the LTC1098(L) can sample
input signals in the single-ended mode or in the differential
inputs during the t
Single-Ended Inputs
The sample-and-hold of the LTC1098(L) allows conversion
of rapidly varying signals. The input voltage is sampled
during the t
interval begins as the bit preceding the MSBF bit is shifted
1ST BIT TEST "–" INPUT MUST
SAMPLE
SETTLE DURING THIS TIME
CC
pin should be bypassed to the ground plane with
SETTLE DURING
"+" INPUT MUST
THIS TIME
SMPL
t
SMPL
MSBF
time as shown in Figure 7. The sampling
LTC1096/LTC1096L
LTC1098/LTC1098L
SMPL
HOLD
time (see Figure 7).
t
CONV
DON'T CARE
10968 F07
B7
WAKEUP
time (see
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