Data Sheet

AD5700/AD5700-1

Rev. D | Page 5 of 24

TIMING CHARACTERISTICS

Table 3.

Parameter1

Unit

Description

1

Bit time2 max

Carrier start time. Time from RTS falling edge to carrier reaching its first peak. See

Figure 3.

1

Bit time2 max

Carrier stop time. Time from RTS rising edge to carrier amplitude dropping below

the minimum receive amplitude.

1

Bit time2 max

Carrier decay time. Time from RTS rising edge to carrier amplitude dropping to ac

zero. See Figure 4.

6

Bit times2 max

Carrier detect on. Time from carrier on to CD rising edge. See Figure 5.

6

Bit times2 max

Carrier detect off. Time from carrier off to CD falling edge. See Figure 6.

10

Bit times2 max

Carrier detect on when switching from transmit mode to receive mode in the

presence of a constant valid carrier. Time from RTS rising edge to CD rising edge.

See Figure 7.

2.1

ms typ

Crystal oscillator power-up time. On application of a valid power supply voltage at

8 pF.

6

ms typ

Crystal oscillator power-up time. Crystal load capacitors = 18 pF.

25

µs typ

Internal oscillator power-up time. On application of a valid power supply voltage

10

ms typ

Reference power-up time.

30

µs typ

Transition time from power-down mode to normal operating mode (external

clock source, external reference).

1

Specifications apply to AD5700/AD5700-1 configured with internal or external receive filter.

2

Bit time is the length of time to transfer one bit of data (1 bit time = 1/1200 Hz = 833.333 µs).