Datasheet

10
LTC1197/LTC1197L
LTC1199/LTC1199L
CS (Pin 1): Chip Select Input. A logic low on this input
enables the LTC1197/LTC1197L/LTC1199/LTC1199L.
Power shutdown is activated when CS is brought high.
+IN, CH0 (Pin 2): Analog Input. This input must be free of
noise with respect to GND.
–IN, CH1 (Pin 3): Analog Input. This input must be free of
noise with respect to GND.
GND (Pin 4): Analog Ground. GND should be tied directly
to an analog ground plane.
V
REF
(Pin 5): LTC1197/LTC1197L Reference Input. The
reference input defines the span of the A/D converter and
must be kept free of noise with respect to GND.
D
IN
(Pin 5): LTC1199/LTC1199L Digital Data Input. The
A/D configuration word is shifted into this input.
D
OUT
(Pin 6): Digital Data Output. The A/D conversion
result is shifted out of this output.
CLK (Pin 7): Shift Clock. This clock synchronizes the serial
data transfer.
V
CC
(Pin 8): Positive Supply. This supply must be kept
free of noise and ripple by bypassing directly to the
analog ground plane. For LTC1199/LTC1199L, V
REF
is
tied internally to this pin.
–
+
C
SMPL
BIAS AND
SHUTDOWN CIRCUIT
SERIAL PORT
V
CC
CS CLK
D
OUT
+IN (CH0)
–IN (CH1)
MICROPOWER
COMPARATOR
CAPACITIVE DAC
SAR
V
REF
GND PIN NAMES IN PARENTHESES
REFER TO THE LTC1199/LTC1199L
(D
IN
)
UU
U
PI FU CTIO S
BLOCK DIAGRA
W