AD5428_15 Datasheet, PDF (13/33 Pages) Analog Devices – Dual 8-/10-/12-Bit, High Bandwidth, Multiplying DACs with Parallel Interface

AD5428/AD5440/AD5447
14
T_A = 25°C
LOADING ZS TO FS
12
10
V_DD = 5V
8
6
V_DD = 3V
4
V_DD = 2.5V
2
0
1
10 100 1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 19. Supply Current vs. Update Rate
6
0
T_A = 25°C
LOADING
–6 _{ZS TO FS}
–12
–18
–24
–30
–36
–42
–48
–54
–60
–66
–72
–78
–84
–90
–96
–102
1
10
ALL ON
DB11
DB10
DB9
DB8
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
ALL OFF
100 1k 10k 100k
FREQUENCY (Hz)
T_A = 25°C
V_DD = 5V
V_REF = ±3.5V
C_COMP = 1.8pF
AMP = AD8038
1M 10M 100M
Figure 20. Reference Multiplying Bandwidth vs. Frequency and Code
0.2
0
–0.2
–0.4
–0.6
T_A = 25°C
V_DD = 5V
V_REF = ±3.5V
C_COMP = 1.8pF
AMP = AD8038
–0.8
1
10 100
1k 10k 100k 1M 10M 100M
FREQUENCY (Hz)
Figure 21. Reference Multiplying Bandwidth—All 1s Loaded
Data Sheet
3
T_A = 25°C
V_DD = 5V
0
–3
–6
V_REF = ±2V, AD8038 C_C 1.47pF
V_REF = ±2V, AD8038 C_C 1pF
V_REF = ±0.15V, AD8038 C_C 1pF
V_REF = ±0.15V, AD8038 C_C 1.47pF
V_REF = ±3.51V, AD8038 C_C 1.8pF
–9
10k
100k
1M
10M
FREQUENCY (Hz)
100M
Figure 22. Reference Multiplying Bandwidth vs. Frequency and
Compensation Capacitor
0.045
0.040
0.035
0x7FF TO 0x800
V_DD = 5V
0.030
T_A = 25°C
V_REF = 0V
AMP = AD8038
C_COMP = 1.8pF
0.025
0.020
V_DD = 3V
0.015
0.010
0.005
0x800 TO 0x7FF
V_DD = 3V
0
–0.005
–0.010
0
V_DD = 5V
20 40 60 80 100 120 140 160 180 200
TIME (ns)
Figure 23. Midscale Transition, VREF = 0 V
–1.68
–1.69
–1.70
0x7FF TO 0x800
V_DD = 5V
T_A = 25°C
V_REF = 3.5V
AMP = AD8038
C_COMP = 1.8pF
–1.71
–1.72
–1.73
–1.74
–1.75
V_DD = 3V
V_DD = 5V
V_DD = 3V
–1.76
0x800 TO 0x7FF
–1.77
0
20 40 60
80 100 120 140 160 180 200
TIME (ns)
Figure 24. Midscale Transition, VREF = 3.5 V
Rev. C | Page 12 of 32