EVAL-AD5700-1EBZ Просмотр технического описания (PDF) - Analog Devices
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EVAL-AD5700-1EBZ Datasheet PDF : 24 Pages
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Data Sheet
AD5700/AD5700-1
TYPICAL PERFORMANCE CHARACTERISTICS
1.4
TA = 25°C; VCC = IOVCC = 3.3V; INT VREF
1.2 RTS AND TXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
1.0
RTS
0.8
t1
0.6
TXD
0.4
0.2
0
HART_OUT
–0.2
–0.4
–0.3 0
0.3 0.6 0.9 1.2 1.5 1.8 2.1
TIME (ms)
Figure 3. Carrier Start Time
1.4
TA = 25°C; VCC = IOVCC = 3.3V; INT VREF
1.2 CD AND RXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
1.0
CD
0.8
t5
0.6
RXD
0.4
0.2
HART SIGNAL
0
–0.2
–0.4
–5
–4
–3
–2
–1
0
1
TIME (ms)
Figure 6. Carrier Detect Off Timing
1.4
TA = 25°C; VCC = IOVCC = 3.3V; INT VREF
1.2 RTS AND TXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
1.0
RTS
0.8
t2
TXD
t3
0.6
0.4
HART_OUT
0.2
0
–0.2
–0.4
–2.0
–1.5
–1.0
–0.5
0
TIME (ms)
0.5
1.0
Figure 4. Carrier Stop/Decay Time
1.4
TA = 25°C; VCC = IOVCC = 3.3V; INT VREF
1.2 CD AND RXD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
FROM 0V TO 3.3V.
1.0
CD
t4
0.8
0.6
RXD
0.4
0.2
0
HART SIGNAL
–0.2
–0.4
–0.5
0
0.5
1.0
1.5
2.0
2.5
TIME (ms)
Figure 5. Carrier Detect On Timing
1.50
TA = 25°C; VCC = IOVCC = 3.3V; INT VREF
1.25 RTS AND CD DC LEVELS HAVE BEEN ADJUSTED FOR
CLARITY. IN REALITY, BOTH OF THESE SIGNALS RANGE
1.00 FROM 0V TO 3.3V.
RTS
t6
0.75
0.50 CD
0.25
0
–0.25
HART SIGNAL HAS ALSO
BEEN OFFSET BY –0.6V.
HART_OUT
–0.50
–0.75
–1.00
HART SIGNAL
–10
–7.5
–5.0
–2.5
0
2.5
TIME (ms)
Figure 7. Carrier Detect on When Switching from Transmit Mode to Receive
Mode in the Presence of a Constant Valid Carrier
100
TA = 25°C
90 VCC = IOVCC = 2.7V TO 5.5V
DEV 1 EXT REF
80
MOD ICC AND IOICC
70
DEMOD ICC AND IOICC
60
50
40
30
MOD IREF
20
DEMOD IREF
10
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
VCC = IOVCC (V)
Figure 8. Supply Currents vs. Supply Voltage—External Reference
Rev. G | Page 9 of 24
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