2645L8 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'2645L8' PDF : 20 Pages View PDF
LTC2645
Typical Performance Characteristics (TA = 25°C, unless otherwise noted.)
(Internal Reference, VFS = 2.5V)
Supply Current vs Input Period
(tPER)
10
LTC2645-12
9
DUTY CYCLE = 50%
8
4-CHANNELS ACTIVE
VCC = 5V
7
6
5
VCC = 3V
4
3
2
1
0
1
10
100
1k
10k 100k
PERIOD (µs)
2645 G23
Supply Current vs Duty Cycle
(tPW/tPER)
4.50
LTC2645-12
VCC = 3V, IDLSEL = 0V
4-CHANNELS ACTIVE
4.25
tPER = 200µs
4.00
tPER = 20ms
3.75
Mid-Scale Glitch Impulse
LTC2645-12
VCC = 5V
2.1nV • s TYPICAL
INX
5V/DIV
VOUTX
5mV/DIV
3.50
0
25
50
75
DUTY CYCLE (%)
100
2645 G24
2µs/DIV
2645 G25
Multiplying Bandwidth
2
0
–2
–4
–6
–8
–10
–12
–14
VCC = 5V
VREF(DC) = 2V
–16 VREF(AC) = 0.2VP-P
CODE = FULL SCALE
–18
1k
10k
100k
FREQUENCY (Hz)
1M
2645 G26
Headroom at Rails vs
Output Current
5.0
4.5
5V SOURCING
4.0
3.5
3V SOURCING
3.0
2.5
2.0
1.5
5V SINKING
1.0
0.5
3V SINKING
0
0 1 2 3 4 5 6 7 8 9 10
IOUT (mA)
2645 G29
10
Gain Error vs Reference Input
1.0
VCC = 5.5V
0.8 GAIN ERROR OF 4 CHANNELS
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
REFERENCE VOLTAGE (V)
2645 G27
Gain Error vs Temperature
1.0
0.5
0
–0.5
–1.0
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
2645 G28
Noise Voltage vs Frequency
500
VCC = 5V
CODE = MID-SCALE
400 INTERNAL REF
300
200
100
DAC-to-DAC Crosstalk (Dynamic)
INA/INB/INC
5V/DIV
DACs A-C
SWITCH 0-FS
2V/DIV
VOUTD
1mV/DIV
LTC2645-12, VCC = 5V
VREF = 2.5V
0.9nV-s TYP
0
100
1k
10k
100k
1M
FREQUENCY (Hz)
2645 G30
2µs/DIV
2645 G31
2645f
For more information www.linear.com/LTC2645
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