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LTC1090CJ View Datasheet(PDF) - Linear Technology

Part Name
Description
MFG CO.
LTC1090CJ
Linear
Linear Technology Linear
'LTC1090CJ' PDF : 28 Pages View PDF
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LTC1090
PI FU CTIO S
#
PIN
1-8
CH0 to CH7
9
COM
FUNCTION
Analog Inputs
Common
10
11
12
13,14
15
16
17
18
19
20
DGND
AGND
V
REF , REF+
CS
DOUT
DIN
SCLK
ACLK
VCC
Digital Ground
Analog Ground
Negative Supply
Reference Inputs
Chip Select Input
Digital Data Output
Data Input
Shift Clock
A/D Conversion Clock
Positive Supply
DESCRIPTION
The analog inputs must be free of noise with respect to AGND.
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.
This is the ground for the internal logic. Tie to the ground plane.
AGND should be tied directly to the analog ground plane.
Tie Vto most negative potential in the circuit. (Ground in single supply applications.)
The reference inputs must be kept free of noise with respect to AGND.
A logic low on this input enables data transfer.
The A/D conversion result is shifted out of this output.
The A/D configuration word is shifted into this input.
This clock synchronizes the serial data transfer.
This clock controls the A/D conversion process.
This supply must be kept free of noise and ripple by bypassing directly to the analog ground
plane.
BLOCK DIAGRA
20
VCC
17 INPUT SHIFT
DIN
REGISTER
CH0
CH1
1
2
CH2
3
CH3
CH4
CH5
4 ANALOG
5 INPUT
6
MUX
CH6
CH7
7
8
9
COM
SAMPLE
AND HOLD
COMP
10-BIT
CAPACITIVE
DAC
10
DGND
11
AGND
12
13
14
V–
REF– REF+
OUTPUT
SHIFT
REGISTER
18
SCLK
16
DOUT
10-BIT
SAR
CONTROL
AND
TIMING
19
ACLK
15
CS
LTC1090 • BD01
1090fc
6
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