LTC1448 Linear Technology, LTC1448 Datasheet - Page 8

• Manufacturer Part Number: LTC1448
• Description: Dual 12-Bit Rail-to-Rail Micropower DAC
• Manufacturer: Linear Technology

LTC1448
TYPICAL APPLICATIONS
This circuit shows how to use one LTC1448 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 LTC1448. V
controls the Common pin for the analog inputs to the
LTC1296 and V
8
OUT B
controls the reference span by setting
P
U
An Autoranging 8-Channel ADC with Shutdown
CS
D
CLK
D
CLK
D
CS/LD
REF
OUT
IN
IN
22 F
SSO
LTC1296
LTC1448
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 LTC1448.
The resistor and capacitor on the LTC1448 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
1448 TA04