LTC1863 LINER [Linear Technology], LTC1863 Datasheet - Page 7

• Manufacturer Part Number: LTC1863
• Description: 12-/16-Bit, 8-Channel 200ksps ADCs
• Manufacturer: LINER [Linear Technology]

PI FU CTIO S
CHO-CH7/COM (Pins 1-8): Analog Input Pins. Analog
inputs must be free of noise with respect to GND. CH7/
COM can be either a separate channel or the common
minus input for the other channels.
REFCOMP (Pin 9): Reference Buffer Output Pin. Bypass to
GND with 10 F tantalum capacitor in parallel with 0.1 F
ceramic capacitor (4.096V Nominal). To overdrive
REFCOMP, tie V
V
used as an external reference buffer input for improved
accuracy and drift. Bypass to GND with 2.2 F tantalum
capacitor in parallel with 0.1 F ceramic capacitor.
CS/CONV (Pin 11): This input provides the dual function
of initiating conversions on the ADC and also frames the
serial data transfer.
TYPICAL CO
TEST CIRCUITS
REF
U
(Pin 10): 2.5V Reference Output. This pin can also be
(A) Hi-Z TO V OH AND V OL TO V OH
U
DN
Load Circuits for Access Timing
REF
3k
U U
U
to GND.
C
L
ECTIO DIAGRA
(B) Hi-Z TO V OL AND V OH TO V OL
U
SINGLE-ENDED
DN
DIFFERENTIAL
2.048V
INPUTS
4.096V
5V
INPUT
3k
C
L
+
–
+
18637 TC01
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7/COM
U U
LTC1863/
LTC1867
REFCOMP
CS/CONV
SCK (Pin 12): Shift Clock. This clock synchronizes the
serial data transfer.
SDO (Pin 13): Digital Data Output. The A/D conversion
result is shifted out of this output. Straight binary format
for unipolar mode and two’s complement format for
bipolar mode.
SDI (Pin 14): Digital Data Input Pin. The A/D configuration
word is shifted into this input.
GND (Pin 15): Analog and Digital GND.
V
GND with 10 F tantalum capacitor in parallel with 0.1 F
ceramic capacitor.
DD
V
GND
SDO
SCK
V
SDI
REF
DD
(Pin 16): Analog and Digital Power Supply. Bypass to
DN
DIGITAL
I/O
Load Circuits for Output Float Delay
(A) V OH TO Hi-Z
10 F
4.096V
5V
3k
LTC1863/LTC1867
C
18637 TCD
L
2.2 F
2.5V
DN
(B) V OL TO Hi-Z
5V
3k
18637 TC02
C
L
18637f
7