LTC1400CS8 Linear Technology, LTC1400CS8 Datasheet - Page 6

• Manufacturer Part Number: LTC1400CS8
• Description: IC A/D CONV 12BIT W/SHTDN 8-SOIC
• Manufacturer: Linear Technology

Specifications of LTC1400CS8

• Number Of Bits: 12
• Sampling Rate (per Second): 400k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 160mW
• Voltage Supply Source: Dual ±
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

PI FU CTIO S
FU CTIO AL BLOCK DIAGRA
LTC1400
V
tantalum in parallel with 0.1μF ceramic).
A
(Bipolar).
V
(10μF tantalum in parallel with 0.1μF ceramic).
GND (Pin 4): Ground. GND should be tied directly to an
analog ground plane.
D
from this pin.
TEST CIRCUITS
6
IN
CC
REF
OUT
U
(Pin 2): Analog Input. 0V to 4.096V (Unipolar), ±2.048V
U
(Pin 1): Positive Supply, 5V. Bypass to GND (10μF
(Pin 3): 2.42V Reference Output. Bypass to GND
(Pin 5): The A/D conversion result is shifted out
U
U
U
CONV
V
CLK
A
REF
IN
D
OUT
CONTROL
LOGIC
2.42V REF
Hi-Z TO V
V
3k
V
OH
OL
TO V
TO Hi-Z
OH
OH
C
SUCCESSIVE APPROXIMATION
LOAD
W
REGISTER/PARALLEL TO
12-BIT CAPACITIVE DAC
SERIAL CONVERTER
C
SAMPLE
12
CLK (Pin 6): Clock. This clock synchronizes the serial data
transfer. A minimum CLK pulse of 50ns will cause the ADC
to wake up from Nap or Sleep mode.
CONV (Pin 7): Conversion Start Signal. This active high
signal starts a conversion on its rising edge. Keeping CLK
low and pulsing CONV two/four times will put the ADC
into Nap/Sleep mode.
V
Bypass to GND with 0.1μF ceramic. V
GND for unipolar operation.
SS
(Pin 8): Negative Supply. –5V for bipolar operation.
D
ZEROING SWITCH
OUT
COMP
Hi-Z TO V
V
V
OL
OH
5V
TO Hi-Z
TO V
3k
C
OL
OL
LOAD
1400 TC01
1400 BD01
V
GND
V
D
CC
SS
OUT
SS
should be tied to
1400fa