LTC1417 LINER [Linear Technology], LTC1417 Datasheet - Page 8

• Manufacturer Part Number: LTC1417
• Description: Low Power 14-Bit, 400ksps Sampling ADC Converter with Serial I/O
• Manufacturer: LINER [Linear Technology]

FUNCTIONAL BLOCK DIAGRA
CONVST (Pin 13): Conversion Start Signal. This active
low signal starts a conversion on its falling edge.
BUSY (Pin 14): The BUSY output shows the converter
status. It is low when a conversion is in progress.
LTC1417
PIN
TEST CIRCUITS
8
D
OUT
U
U
REFCOMP
A) HI-Z TO V
(4.096V)
FUNCTIONS
DGND
AGND
V
A
A
REF
IN
IN
+
–
U
1k
OH
10
1
2
3
4
5
U
DGND
Load Circuits for Access Timing
AND V
OL
8k
INTERNAL
TO V
U
CLOCK
REF AMP
C
OH
L
2.5V REF
EXTCLKIN
6
MUX
D
B) HI-Z TO V
OUT
OL
SHDN
14-BIT CAPACITIVE DAC
5V
AND V
SUCCESSIVE APPROXIMATION
11
1k
DGND
C
C
C
L
SAMPLE
SAMPLE
W
OH
CONVST
CONTROL LOGIC
TO V
REGISTER
1417 TC01
13
OL
RD
12
V
Bypass to AGND using 10 F tantalum in parallel with
0.1 F ceramic. Analog ground for unipolar operation.
V
10 F tantalum in parallel with 0.1 F ceramic.
CLKOUT
SS
DD
D
8
OUT
(Pin 15): Negative Supply, –5V for Bipolar Operation.
(Pin 16): 5V Positive Supply. Bypass to AGND with
BUSY
14
ZEROING SWITCHES
14
A) V
Load Circuits for Output Float Delay
+
–
1k
OH
COMP
SHIFT REGISTER
TO HI-Z
30pF
1417 BD
16
15
9
7
D
D
SCLK
V
V
(0V FOR UNIPOLAR MODE
–5V FOR BIPOLAR MODE)
OUT
DD
SS
OUT
B) V
OL
5V
TO HI-Z
1k
1417 TC02
30pF