LTC1446 Linear Technology, LTC1446 Datasheet - Page 10

• Manufacturer Part Number: LTC1446
• Description: Dual 12-Bit Rail-to-Rail Micropower DACs in SO-8
• Manufacturer: Linear Technology

LTC1446/LTC1446L
TYPICAL APPLICATIONS
This circuit shows how to use one LTC1446 to make an
autoranging ADC. The microprocessor sets the reference
span and the Common pin for the analog input by loading
the appropriate digital code into the LTC1446. V
controls the Common pin for the analog inputs to the
LTC1296 and V
10
OUT B
controls the reference span by setting
P
U
An Autoranging 8-Channel ADC with Shutdown
N
CS
D
CLK
D
CLK
D
CS/LD
D
OUT
IN
IN
OUT
22 F
SSO
LTC1296
LTC1446
V
OUT A
CC
74HC04
REF –
V
V
REF +
OUT B
OUT A
5V
COM
GND
CH0
CH7
V
CC
50k
the REF
down pin that goes low in shutdown mode. This will turn
off the PNP transistor supplying power to the LTC1446.
The resistor and capacitor on the LTC1446 outputs act as
a lowpass filter for noise.
8 ANALOG
INPUT CHANNELS
100
100
50k
+
pin on the LTC1296. The LTC1296 has a Shut-
0.1 F
0.1 F
0.1 F
5V
1446/46L F03