LTC1857 LINEAR [Linear Integrated Systems], LTC1857 Datasheet - Page 8

• Manufacturer Part Number: LTC1857
• Description: 8-Channel, 12-/14-/16-Bit, 100ksps SoftSpan A/D Converters with Shutdown
• Manufacturer: LINEAR [Linear Integrated Systems]

LTC1857/LTC1858/LTC1859
PI FU CTIO S
DGND (Pin 24): Digital Ground.
SDI (Pin 25): Serial Data Input.
SCK (Pin 26): Serial Data Clock.
FU CTIO AL BLOCK DIAGRA
TEST CIRCUITS
8
U
U
(A) Hi-Z TO V OH AND V OL TO V OH
DN
COM
CH0
CH1
CH7
U
•
•
•
U
Load Circuits for Access Timing
1k
U
INPUT MUX
25pF
RANGE
SELECT
AGND1
AND
MUXOUT
(B) Hi-Z TO V OL AND V OH TO V OL
–
DN
MUXOUT
5V
1k
+
25pF
ADC
+
W
1859 TC01
MUX ADDRESS AND RANGE
ADC
–
REFERENCE
V
2.5V
REF
+
–
8k
RD (Pin 27): Read Input. This active low signal enables the
digital output pin SDO.
CONVST (Pin 28): Conversion Start. This active high
signal starts a conversion on its rising edge.
SAMPLING ADC
12-/14-/16-BIT
INTERNAL
1.6384X
4.096V
CLOCK
REFCOMP
DN
Load Circuits for Output Float Delay
(A) V OH TO Hi-Z
DATA OUT
1k
AGND2
AV
CONTROL
DD
LOGIC
25pF
SERIAL I/O
AGND3
DV
DD
DGND
DN
(B) V OL TO Hi-Z
1859 BD
5V
1k
1859 TC02
25pF
CONVST
SDI
BUSY
SCK
RD
OV
SDO
DD
185789f