7
LTC1293/LTC1294/LTC1296
129346fs
PI FU CTIO S
U
UU
# PIN FUNCTION DESCRIPTION
1 – 6 CH0 – CH5 Analog Inputs The analog inputs must be free of noise with respect to AGND.
7 COM Common The common pin defines the zero reference point for all single ended inputs. It must be free of noise and is
usually tied to the analog ground plane.
8 DGND Digital Ground This is the ground for the internal logic. Tie to the ground plane.
9V
–
Negative Supply Tie V
–
to most negative potential in the circuit (Ground in single supply applications).
10 AGND Analog Ground AGND should be tied directly to the analog ground plane.
11 V
REF
Ref. Input The reference inputs must be kept free of noise with respect to AGND.
12 D
IN
Data Input The A/D configuration word is shifted into this input.
13 D
OUT
Digital Data Output The A/D conversion result is shifted out of this output.
14 CS Chip Select Input A logic low on this input enables data transfer.
15 CLK Clock This clock synchronizes the serial data transfer and controls A/D conversion rate.
16 V
CC
Positive supply This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane.
LTC1293
# PIN FUNCTION DESCRIPTION
1 –8 CH0 – CH7 Analog Inputs The analog inputs must be free of noise with respect to AGND.
9 COM Common The common pin defines the zero reference point for all single ended inputs. It must be free of noise and is
usually tied to the analog ground plane.
10 DGND Digital Ground This is the ground for the internal logic. Tie to the ground plane.
11 V
–
Negative Supply Tie V
–
to most negative potential in the circuit (Ground in single supply applications).
12 AGND Analog Ground AGND should be tied directly to the analog ground plane.
13, 14 REF
–
, REF
+
Ref. Inputs The reference inputs must be kept free of noise with respect to AGND. The A/D sees a reference voltage equal
to the difference between REF
+
and REF
–
.
15 D
IN
Data Input The A/D configuration word is shifted into this input.
16 D
OUT
Digital Data Output The A/D conversion result is shifted out of this output.
17 CS Chip Select Input A logic low on this input enables data transfer.
18 CLK Clock This clock synchronizes the serial data transfer and controls A/D converion rate.
19, 20 AV
CC,
DV
CC
Positive Supplies These supplies must be kept free of noise and ripple by bypassing directly to the analog ground plane. AV
CC
and DV
CC
must be tied together.
LTC1294
# PIN FUNCTION DESCRIPTION
1 –8 CH0 – CH7 Analog Inputs The analog inputs must be free of noise with respect to AGND.
9 COM Common The common pin defines the zero reference point for all single ended inputs. It must be free of noise and is
usually tied to the analog ground plane.
10 DGND Digital Ground This is the ground for the internal logic. Tie to the ground plane.
11 V
–
Negative Supply Tie V
–
to most negative potential in the circuit (Ground in single supply applications).
12 AGND Analog Ground AGND should be tied directly to the analog ground plane.
13, 14 REF
–
, REF
+
Ref. Inputs The reference inputs must be kept free of noise with respect to AGND. The A/D sees a reference voltage equal
to the difference between REF
+
and REF
–
.
15 D
IN
Data Input The A/D configuration word is shifted into this input.
16 D
OUT
Digital Data Output The A/D conversion result is shifted out of this output.
17 CS Chip Select Input A logic low on this input enables data transfer.
18 CLK Clock This clock synchronizes the serial data transfer and controls A/D conversion rate.
19 SSO System Shutdown System Shutdown Output pin will go low when power shutdown is requested.
Output
20 V
CC
Positive Supply This supply must be kept free of noise and ripple by bypassing directly to the analog ground plane.
LTC1296
