AK2500B Datasheet, PDF (14/17 Pages) Asahi Kasei Microsystems – DS3/STS-1 Analog Line Receiver

ASAHI KASEI
Application Circuit Example
[AK2500B]
FRAMER
B3ZS
CODER/
DECODER
CLOCK
SOURCE
CONTROL
LOGIC
17 _RCLK
19 RPDATA
18 RNDATA
13 ^EXCLK
3 _RLOL
12 _RLOS
2 _LOSTHR
24 _MODE2
23 _MODE1
7 RESET
AK2500B
0.01uF
RIN
4
COAX
75ohm
16
VDDC
5, 6, 15
VDDA
14
VDDD
3.3V
0.1uF
11
VSSD
0.1uF
VSSA ^{10, 21, 22}
VSSC ²⁰
0.1uF
BREF TREF
8
9
0.1uF 0.1uF
IREF
1
4.9kohm
Fig. 7 Application circuit example
Board Layout Consideratons
The recommended power supply de-coupling circuit is illustrated in Figure 7. Good quality high-frequency, low
lead-inductance capacitors should be used. If the performance of Jitter Tolerance or S/X is not good, please try to
use smaller de-coupling capacitors such as 0.01uF. These performances are affected by the power supply noise
which depends on the customer’s board circuit and layout. All capacitors should be as close to the device as
possible.
MS0005-E-00
- 14 -
1999/12