Datasheet

LTC2757
7
2757f
TYPICAL PERFORMANCE CHARACTERISTICS
Settling Full-Scale Step
INL vs V
DD
DNL vs V
DD
Logic Threshold
vs Supply Voltage
Supply Current
vs Logic Input Voltage
Supply Current
vs Update Frequency
Mid-Scale Glitch (V
DD
= 3V)
LOGIC VOLTAGE (V)
01
0
I
DD
(mA)
2
4
6
8
10
12
2345
2757 G16
V
DD
= 5V
V
DD
= 3V
ALL DIGITAL PINS
TIED TOGETHER
(EXCEPT READ
TIED TO GND)
V
DD
(V)
2.5
0.5
LOGIC THRESHOLD (V)
0.75
1
1.25
1.5
2
3
3.5 4 4.5
5 5.5
1.75
2757 G17
RISING
FALLING
UPD FREQUENCY (Hz)
10
SUPPLY CURRENT (µA)
10
100
100k
1
0.1
100
1k
10k
1M
1000
2757 G18
V
DD
= 5V
V
DD
= 3V
ALTERNATING ZERO-SCALE/FULL-SCALE
500ns/DIV
UPD
5V/DIV
GATED
SETTLING
WAVEFORM
100µV/DIV
(AVERAGED)
2757 G13
LT1468 AMP; C
FEEDBACK
= 20pF
0V TO 10V STEP
V
REF
= –10V; SPAN CODE = 000
t
SETTLE
= 1.8µs to 0.0004% (18 BITS)
V
DD
= 5V, V(R
IN
) = 5V, T
A
= 25°C, unless otherwise noted.
V(R
IN
) (V)
2.5 3.5 4
–1.0
INL (LSB)
–0.8
–0.6
–0.2
–0.4
0.4
0.2
0
0.6
0.8
1.0
±10V RANGE
54.5 5.5
2757 G10
3
+INL
–INL
V(R
IN
) (V)
2.5 3.5 4
–1.0
DNL (LSB)
–0.8
–0.6
–0.2
–0.4
0.4
0.2
0
0.6
0.8
1.0
±10V RANGE
54.5 5.5
2757 G11
3
+DNL
–DNL
Mid-Scale Glitch (V
DD
= 5V)
500ns/DIV
UPD
5V/DIV
V
OUT
10mV/DIV
2757 G14
0V TO 5V RANGE
LT1468 OUTPUT AMPLIFIER
C
FEEDBACK
= 50pF
RISING MAJOR CARRY TRANSITION.
FALLING TRANSITION IS SIMILAR OR BETTER.
1.4nV•s TYP
500ns/DIV
UPD
5V/DIV
V
OUT
10mV/DIV
2757 G15
0V TO 5V RANGE
LT1468 OUTPUT AMPLIFIER
C
FEEDBACK
= 50pF
RISING MAJOR CARRY TRANSITION.
FALLING TRANSITION IS SIMILAR OR BETTER.
3nV•s TYP
Multiplying Frequency Response
vs Digital Code
ALL BITS ON
ALL BITS OFF
FREQUENCY (Hz)
100 1k 10k
–140
ATTENUATION (dB)
–100
–120
–60
–80
–40
–20
0
1M100k 10M
2757 G12
0V TO 5V OUTPUT RANGE
LT1468 OUTPUT AMPLIFIER
C
FEEDBACK
= 15pF
D17
D16
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0