AK2500B 데이터 시트보기 (PDF) - Asahi Kasei Microdevices

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AK2500B

DS3/STS-1 Analog Line Receiver

Asahi Kasei Microdevices 

ASAHI KASEI

[AK2500B]

Equalizer Bypass

If the incoming signal is attenuated by flat loss only (zero cable loss), the internal equalizer should be bypassed

with MODE1=1, MODE2=1. (See Table 4) The level of the incoming signal should satisfy the RIN input range

(50mVpk - 1000mVpk for DS3/STS-1).

Table 4. Mode Control

MODE2

(pin24)

0

1

MODE1

(pin23)

0

OPEN

1

Function

Equalizer Enable

TEST MODE (Factory use only)

Equalizer Bypass

DSX-3

(1)Cable loss 0 - 450feet

+ Flat loss

Cable

0 - 450feet

Flat Loss

0 - 6dB

AK2500B

MODE2 MODE1

0

0

Equalizer enable

(2)Flat loss only

Transmitter

Flat Loss

Monitoring

circuit

AK2500B

MODE2 MODE1

1

1

Equalizer bypass

Fig. 1 AK2500B Application

Clock Acquisition

If a valid input signal is assumed to be already present at the analog input, the maximum time between the

application of device power and error-free operation is typically 20 ms.

Table 5. PLL Lock Acquisition Time

(TA = Tmin to Tmax; V+ = 3.3V±0.3V; GND = 0V)

Conditions

Power up

Power : Off -> On

Input data : Valid

Input data restore

Power : On

Input data : Loss -> Valid

min typ Max Units

20

ms

1.0 5.0 ms

MS0005-E-00

-6-

1999/12

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