LTC1448CS8 Linear Technology, LTC1448CS8 Datasheet - Page 4

• Manufacturer Part Number: LTC1448CS8
• Description: IC D/A CONV 12BIT R-R DUAL 8SOIC
• Manufacturer: Linear Technology

Specifications of LTC1448CS8

• Settling Time: 14µs
• Number Of Bits: 12
• Data Interface: Serial
• Number Of Converters: 2
• Voltage Supply Source: Single Supply
• Power Dissipation (max): 2.5mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

CLK (Pin 1): Serial Interface Clock. Internal Schmitt trig-
ger on this input allows direct optocoupler interface.
D
latched into the shift register on the rising edge of the serial
clock.
CS/LD (Pin 3): Serial Interface Enable and Load Control.
When CS/LD is low the CLK signal is enabled, so the data
can be clocked in. When CS/LD is pulled high, data is
loaded from the shift register into the DAC register,
LTC1448
TYPICAL PERFORMANCE CHARACTERISTICS
PIN
4
IN
–1
–2
–3
–4
–5
U
5
4
3
2
1
0
(Pin 2): Serial Interface Data. Data on the D
Integral Nonlinearity (INL)
0
FUNCTIONS
512
1024
U
1536
CODE
2048 2560
800
700
600
500
400
300
200
100
0
U
0
Minimum Output Voltage vs
Output Sink Current
CODE: ALL 0’s
3072 3584 4095
OUTPUT SINK CURRENT (mA)
W
1448 G01
5
U
10
–0.1
–0.2
–0.3
–0.5
–0.4
0.1
0.5
0.4
0.3
0.2
125 C
–55 C
0
25 C
0
Differential Nonlinearity (DNL)
IN
1448 G04
512
pin is
15
1024
1536
CODE
2048 2560
updating the DAC output and the CLK is disabled
internally.
REF (Pin 4): Reference Input for Both DACs. This pin can
be tied to V
typical input resistance is 12.5k.
V
GND (Pin 6): Ground.
V
Requires a bypass capacitor to ground.
OUT A
CC
(Pin 7): Positive Supply Input. 2.7V
2.0
1.6
1.2
0.8
0.4
3072 3584 4095
, V
0
Supply Current vs
Logic Input Voltage
0
OUT B
CC
1448 TA02
. The output will swing from 0V to REF. The
1
LOGIC INPUT VOLTAGE (V)
(Pins 5, 8): Buffered DAC Outputs.
2
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3
0
Minimum Supply Headroom for
Full Output Swing vs Load Current
CODE: ALL 1’s
V
OUT
V
OUT
4
= 4.095V
< 1LSB
LOAD CURRENT (mA)
1448 G06
5
5
V
10
CC
5.5V.
1448 G03
15