Datasheet

6
LTC1864/LTC1865
18645f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
SINAD vs Frequency
THD vs Frequency
SFDR vs Frequency
REFERENCE VOLTAGE (V)
0
CHANGE IN OFFSET ERROR (LSB)
75
50
25
0
–25
4
1864/65 G10
1
2
3
5
V
CC
= 5V
T
A
= 25°C
TEMPERATURE (°C)
–50
CHANGE IN OFFSET (LSB)
5
4
3
2
1
0
–1
–2
–3
–4
–5
0
50
75
1864/65 G11
–25
25
100
125
V
CC
= 5V
V
REF
= 5V
REFERENCE VOLTAGE(V)
0
CHANGE IN GAIN ERROR (LSB)
20
15
10
5
0
–5
–10
–15
–20
2
4
5
1864/65 G12
1
3
V
CC
= 5V
T
A
= 25°C
TEMPERATURE (°C)
–50
CHANGE IN GAIN ERROR (LSB)
5
4
3
2
1
0
–1
–2
–3
–4
–5
0
50
75
1864/65 G13
–25
25
100
125
V
CC
= 5V
V
REF
= 5V
FREQUENCY
1800
1600
1400
1200
1000
800
600
400
200
0
CODE
1864/65 G14
–4 –3 –2 –1
0
1
2345
00 1200
1534
127
516
1178
729
V
CC
= 5V
T
A
= 25°C
V
REF
= 5V
FREQUENCY (kHz)
AMPLITUDE (dB)
0
–20
–40
–60
–80
–100
–120
–140
1864/65 G15
0
20
40 60 80 100 120
f
S
= 203.125kHz
f
IN
= 99.72763kHz
V
CC
= 5V
V
REF
= 5V
T
A
= 25°C
Change in Offset Error vs
Reference Voltage
Change in Offset vs Temperature
Change in Gain Error vs
Reference Voltage
Change in Gain Error vs
Temperature
Histogram of 4096 Conversions
of a DC Input Voltage
4096 Point FFT Nonaveraged
F
IN
(kHz)
1
SINAD (dB)
100
90
80
70
60
50
40
30
20
10
0
10 100 1000
1864/5 G16
V
CC
= 5V
V
REF
= 5V
T
A
= 25°C
V
IN
= 0dB
SNR
SINAD
F
IN
(kHz)
1
THD (dB)
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–100
10 100 1000
1864/5 G17
V
CC
= 5V
V
REF
= 5V
T
A
= 25°C
V
IN
= 0dB
F
IN
(kHz)
1
SFDR (dB)
100
90
80
70
60
50
40
30
20
10
0
10 100 1000
1864/5 G18
V
CC
= 5V
V
REF
= 5V
T
A
= 25°C
V
IN
= 0dB