Datasheet

AD5628/AD5648/AD5668 Data Sheet
Rev. G | Page 18 of 32
0
–140
–120
–100
–80
–60
–40
–20
0 10,0008000600040002000
THD (dB)
FREQUENCY (Hz)
05302-148
V
DD
= 5.5V
EXT REF = 5V
T
A
= 25°C
V
REF
= 2V ± 0.1V p-p
FREQUENCY = 10kHz
Figure 49. Total Harmonic Distortion
9
0
1
2
3
4
6
7
8
5
010987654321
SETTLING TIME (µs)
CAPACITIVE LOAD (nF)
V
DD
= EXTERNAL REFERENCE = 5V
V
DD
= EXTERNAL REFERENCE = 3V
T
A
= 25°C
05302-149
Figure 50. Settling Time vs. Capacitive Load
5.5
–0.5
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
–10 1050–5
VOLTAGE (V)
TIME (µs)
V
OUT
A
CLR PULSE
EXT REF = 5V
05302-150
Figure 51. Hardware
CLR
10
–80
–70
–60
–50
–40
–30
–20
–10
0
10 100M10M1M100k1k01k100
V
OUT
(dBm)
FREQUENCY (Hz)
CH A
CH B
CH C
CH D
CH E
CH F
CH G
CH H
–3dB
05302-151
V
DD
= 5.5V
EXT REF = 5V
T
A
= 25°C
V
REF
= 2V ± 0.2V p-p
Figure 52. Multiplying Bandwidth
1.2510
1.2490
1.2492
1.2494
1.2496
1.2498
1.2500
1.2502
1.2504
1.2506
1.2508
–40 25 105
REFERENCE (ppm/°C)
TEMPERATURE (°C)
05302-152
V
DD
= 5.5V
Figure 53. 1.25 V Reference Temperature Coefficient vs. Temperature
05302-154
2.503
2.495
2.496
2.497
2.498
2.499
2.500
2.501
2.502
105 25 –40
REFERENCE (ppm/°C)
TEMPERATURE (°C)
Figure 54. 2.5 V Reference Temperature Coefficient vs. Temperature