LTC2366 Linear Technology, LTC2366 Datasheet - Page 21

• Manufacturer Part Number: LTC2366
• Description: (LTC2365 / LTC2366) 12-Bit Serial Sampling ADCs
• Manufacturer: Linear Technology

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APPLICATIONS INFORMATION
High quality tantalum and ceramic bypass capacitors
should be used at the V
Typical Application circuit on the fi rst page of this data
sheet. For optimum performance, a 10μF surface mount
AVX capacitor with a 0.1μF ceramic is recommended for
the V
with a 0.1μF ceramic is recommended for the V
OV
capacitors such as Murata GRM235Y5V106Z016 may
be used. The capacitors must be located as close to the
pins as possible. The traces connecting the pins and the
bypass capacitors must be kept short and should be made
as wide as possible.
DD
DD
pins. Alternatively, 4.7μF and 10μF ceramic chip
pin and a 4.7μF surface mount AVX capacitor
DD
and V
REF
pins as shown in the
VIAS TO GROUND PLANE
Figure 20. Power Supply Ground Practice
CA
IN
REF
PIN 1
and
GND
V
A
DD
IN
Figure 20 shows the recommended system ground con-
nections. All analog circuitry grounds should be terminated
at the LTC2365/LTC2366. The ground return from the
LTC2365/LTC2366 to the power supply should be low
impedance for noise free operation. Digital circuitry grounds
must be connected to the digital supply common.
In applications where the ADC data outputs and control sig-
nals are connected to a continuously active microprocessor
bus, it is possible to get errors in the conversion results.
These errors are due to feedthrough from the micropro-
cessor to the successive approximation comparator. The
problem can be eliminated by forcing the microprocessor
into a Wait state during conversion or by using three-state
buffers to isolate the ADC data bus.
+
CV
10μF
DD
SDO
SCK
CS
23656 F20
LTC2365/LTC2366
21
23656f