Datasheet

Data Sheet AD5700/AD5700-1
Rev. F | Page 9 of 24
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 3. Carrier Start Time
Figure 4. Carrier Stop/Decay Time
Figure 5. Carrier Detect On Timing
Figure 6. Carrier Detect Off Timing
Figure 7. Carrier Detect on When Switching from Transmit Mode to Receive
Mode in the Presence of a Constant Valid Carrier
Figure 8. Supply Currents vs. Supply Voltage—External Reference
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.3 0 0.3 0.6 0.9 1.2 1.5 1.8 2.1
TIME (ms)
HART_OUT (V)
10435-003
TXD
RTS
T
A
= 25°C; V
CC
= IOV
CC
= 3.3V; INT V
REF
RTS AND TXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
HART_OUT
t
1
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–2.0 –1.5 –1.0 –0.5
0 0.5 1.0
TIME (ms)
HART_OUT (V)
10435-004
TXD
RTS
HART_OUT
T
A
= 25°C; V
CC
= IOV
CC
= 3.3V; INT V
REF
RTS AND TXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
t
3
t
2
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.5 0 0.5
1.0 1.5 2.0 2.5
TIME (ms)
HART SIGNAL (V)
10435-005
RXD
CD
HART SIGNAL
T
A
= 25°C; V
CC
= IOV
CC
= 3.3V; INT V
REF
CD AND RXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
t
4
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–5 –4 –3 –2 –1 0 1
TIME (ms)
HART SIGNAL (V)
10435-006
RXD
CD
HART SIGNAL
T
A
= 25°C; V
CC
= IOV
CC
= 3.3V; INT V
REF
CD AND RXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
t
5
1.50
1.25
1.00
0.75
0.50
0.25
0
–0.50
–0.25
–0.75
–1.00
–10 –7.5 –5.0 –2.5
0 2.5
TIME (ms)
HART_OUT (V)
10435-007
CD
HART_OUT
HART SIGNAL
RTS
T
A
= 25°C; V
CC
= IOV
CC
= 3.3V; INT V
REF
RTS AND CD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
HART SIGNAL HAS ALSO
BEEN OFFSET BY –0.6V.
t
6
100
90
80
70
60
50
40
30
20
10
0
2.0 2.5 3.0
3.5 4.0 4.5 5.0 5.5 6.0
V
CC
= IOV
CC
(V)
SUPPLY CURRENT (µA)
10435-008
T
A
= 25°C
V
CC
= IOV
CC
= 2.7V TO 5.5V
DEV 1 EXT REF
DEMOD I
CC
AND IOI
CC
DEMOD I
REF
MOD I
REF
MOD I
CC
AND IOI
CC