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PDF AK2500B Data sheet ( Hoja de datos )
| Número de pieza | AK2500B | |
| Descripción | DS3/STS-1 Analog Line Receiver | |
| Fabricantes | Asahi Kasei Microsystems | |
| Logotipo |  |
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ASAHI KASEI
[AK2500B]
AK2500B
DS3/STS-1 Analog Line Receiver
GENERAL DESCRIPTION
The AK2500B is a DSP based line receiver. It
provides the analog receive line interface
functions for a 44.736 MHz DS3 or 51.84 MHz
STS-1 interface. The device operates from a
single +3.3 Volt supply and is transparent to the
framing format.
FEATURE
- “Robust” DSP based line receiver
- AK2500B Provides Complete Analog Line
Receiver for DS3 and STS-1 Applications
- Provides Line Equalization, and Clock and Data
Recovery Functions
PACKAGE
- 24 pin SOP
APPLICATIONS
- Interfacing network transmission equipment
such as SONET multiplexor and M13 to a DSX-
3 cross connect.
- Interfacing customer premises equipment to a
line.
BLOCK DIAGRAM
RLOL
RCLK
CLOCK
RECOVERY
TREF BREF IREF
EXCLK
RPDATA
RNDATA
VDDA
VSSA
VDDD
VSSD
VDDC
VSSC
MS0005-E-00
DATA
RECOVERY
LOS
LOGIC
GAIN and LINE
EQUALIZATION
RIN
LOSTHR RLOS
-1-
MODE2 MODE1 RESET
1999/12
1 page  
ASAHI KASEI
[AK2500B]
FUNCTIONAL DESCRIPTION
The AK2500B provides the basic receiver functions of a high-speed line card as shown in Fig.7.
The receiver extracts data and clock from a B3ZS coded signal and outputs clock and synchronized data.
Signal Requirements
Pulse characteristics are specified at the DSX-3.
Table 1. DS3 Interface Specification
Parameter
Specification
Line Rate
44.736Mbps±20ppm
Line Code
B3ZS
Test Load
75Ω±5%
Standards
GR-499-CORE , ANSI T1-102 , T1.404
Table 2. STS-1 Interface Specification
Parameter
Line Rate
51.840Mbps±20ppm
Specification
Line Code
B3ZS
Test Load
75Ω±5%
Standards
GR-253-CORE , ANSI T1-102
Equalization
The incoming data may have the loss of cable and/or flat. Cable type and length from the cross-connect are
specified as shown in Table 3. Equalizer compensates appropriately for a nominal DSX-3/STS-1 pulse as
attenuated by 0 - 450 feet of 728A cable.
Table 3. DS3/STS-1 Cable Specification
Parameter
Cable Type
Cable Length
Specification
Type 728A coaxial cable (or equivalent)
0 – 450 feet (from DSX-3 point)
MS0005-E-00
-5-
1999/12
5 Page 
ASAHI KASEI
[AK2500B]
ANALOG SPECIFICATIONS
(TA = Tmin to Tmax; V+ = 3.3V±0.3V; GND = 0V)
Parameter
Condition
Min Typ Max Units
Jitter Transfer
3dB Bandwidth
- 205 - kHz
with repetitive 100 pattern (Note 4) Peaking
- 0.05 0.1 dB
Jitter Tolerance
(Including cable loss)
(Note 4, 5)
5kHz
10kHz
60kHz
300kHz
1MHz
18 UIpp
8 UIpp
1.5 UIpp
0.4 UIpp
0.3 UIpp
Signal Noise Immunity (Note 6)
- 11 - dB
Output Jitter with Jitter-Free Input All one's pattern - 1.4 - nsp-p
(Note4)
Repetitive 1000
- 1.8 - nsp-p
pattern
Output Clock Duty Cycle (Note4)
45 - 55 %
Receiver Input Range
50 - 1000 mVpk
DLOS detection
RIN to RPDATA Delay Time
170 175 180 bits
8 bits
Note; 4. Measured with repetitive input at nominal DSX-3 level with (V+)=3.3V, TA=25°C
5. Typical performance is shown in Fig. 3.
6. Measured with sinusoidal noise, peak amplitude of noise is 11dB down from peak amplitude of
signal. The noise frequency is 22MHz±22kHz(DS3), 26MHz±26kHz(STS-1).
100
G.752
10 GR-499 Category II
GR-499 Category I
1
3.2k, 14UIpp
AK2500B
Typical performance
300k, 0.3UIpp
0.1
0.05UIpp
0.01
0.01
0.1 1 10 100
Jitter Frequency [kHz]
Fig. 3 Jitter Tolerance(STS-1)
1000
10000
MS0005-E-00
- 11 -
1999/12
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet AK2500B.PDF ] | |
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