AK2500B AKM Semiconductor, Inc., AK2500B Datasheet
AK2500B
Related parts for AK2500B
AK2500B Summary of contents
Page 1
... ASAHI KASEI 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. PACKAGE - 24 pin SOP RLOL ...
Page 2
... RLOL RIN VDDA VDDA RESET BREF TREF VSSA VSSD RLOS MS0005-E-00 24 PIN SOP Package AK2500B [AK2500B] MODE2 MODE1 VSSA VSSA VSSC RPDATA RNDATA RCLK VDDC VDDA VDDD EXCLK 1999/12 ...
Page 3
... RIN is more than 5kohm. 3)Pulled up to VDD with internal register. (typical 50k ohm) MS0005-E-00 Maximum Minimum AC load DC load 15pF 15pF 15pF 15pF 15pF - 3 - [AK2500B] Status on Remarks Reset Note 1 “H” Note 2 Note 3 “H” “L” “L” “L” 1999/12 ...
Page 4
... Receive Negative Data. 19 RPDATA O Receive Positive Data. VSSC - 20 Ground for the output buffer. 0 volts. 21 VSSA - Ground for the analog part. 0 volts. 22 VSSA - Mode Control. MODE1 I 23 Equalizer enable/bypass mode, Test mode are selectable as shown in MODE2 I 24 Table 4. MS0005-E-00 Function - 4 - [AK2500B] The EXCLK 1999/12 ...
Page 5
... ASAHI KASEI 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. ...
Page 6
... Function 0 Equalizer Enable TEST MODE (Factory use only) 1 Equalizer Bypass DSX-3 Cable Flat Loss 0 - 6dB 0 - 450feet Flat Loss Monitoring Transmitter circuit Fig. 1 AK2500B Application Table 5. PLL Lock Acquisition Time - 6 - [AK2500B] AK2500B MODE2 MODE1 0 0 Equalizer enable AK2500B MODE2 MODE1 1 1 Equalizer bypass ...
Page 7
... An external reference clock EXCLK is used to set the frequency of the PLL. The frequency of EXCLK should be within the ideal clock ± 100ppm. Reset AK2500B/01B goes into RESET status if RESET input is low. Output pins status is as follows during the low input on RESET . RLOS, RLOL ...
Page 8
... Set Alarm Level is 0.5dB lower than Clear Alarm Level - Measured with PN20 pattern, 450ft cable loss, flat loss MS0005-E-00 Set Alarm Level Max. Upper Min. Lower Max. Lower Threshold Threshold Threshold 125 [AK2500B] Units 105 1999/12 ...
Page 9
... DLOS 2) No 100bits of consecutive 0s : Recovered from RIN data : High Peak level of the incoming data ALOS : Recovered from EXCLK : High Fig. 2 Loss of Signal state diagram - 9 - [AK2500B] includes the following data. Clear Alarm Threshold > Level 1999/12 ...
Page 10
... EXCLK Frequency DS3 STS-1 MS0005-E-00 Symbol Min V+ -0.3 Vin GND-0.3 Iin - TA -40 tstg - Condition Min V+ 3.0 TA -40 IS PN20 - - PN20 44.736 - 100ppm 51.84 - 100ppm - 10 - [AK2500B] Max Units 4.6 V (V+)+0 150 Normal Typ Max Units 3.3 3 105 mA 100 110 mA 44.736 44.736 MHz + 100ppm 51 ...
Page 11
... Repetitive 1000 - pattern 45 50 170 AK2500B Typical performance [AK2500B] Typ Max Units 205 - kHz 0.05 0 UIpp 8 UIpp 1.5 UIpp ...
Page 12
... Symbol Min tpwh 8.7 tpwl (Note 11, 13) 8.7 tpwh1/tpw tr tf tdcrd tscrd 5.0 thcrd 7.0 ± 0.3V; GND = 0V) Symbol Min VIH (V+) x 0.7 VIL GND VOH (V+) x 0.8 VOL GND 16. Pins RLOS, RLOL 17. Except RESET - 12 - [AK2500B] Typ Max Units 11.177 12.2 ns 11.177 Typ Max Units 9 ...
Page 13
... ASAHI KASEI RCLK Fig. 4 Signal Rise and Fall Characteristics RCLK RPDATA RNDATA Fig. 5 Recovered Clock and Data Switching Characteristics EXCLK Fig. 6 EXCLK Duty Cycle Requirements MS0005-E- 90% 90% 10% 10 pwh pwl t dcrd t t scrd hcrd t pwh1 VDD [AK2500B 1999/12 ...
Page 14
... MS0005-E-00 17 RCLK 19 RPDATA 18 RNDATA AK2500B EXCLK 13 3 RLOL 12 RLOS 2 LOSTHR 24 MODE2 23 MODE1 7 RESET IREF BREF TREF 8 9 0.1uF 0.1uF Fig. 7 Application circuit example - 14 - [AK2500B] 0.01uF RIN COAX 4 75ohm 3.3V 16 VDDC VDDA 14 VDDD 0.1uF 0.1uF 0.1uF 11 VSSD 10, 21, 22 VSSA 20 VSSC 1 4.9kohm 1999/12 ...
Page 15
... ASAHI KASEI Marking (1)Pin #1 indication (2)Date Code: 7digits XXXXYZZ (3)Marketing Code: AK2500B (4)Country of Origin: JAPAN (5)Asahi Kasei Logo MS0005-E-00 AKM AK2500B XXXXYZZ JAPAN - 15 - [AK2500B] 1999/12 ...
Page 16
... ASAHI KASEI Outline Dimensions MS0005-E- [AK2500B] 1999/12 ...
Page 17
... AKM harmless from any and all claims arising from the use of said product in the absence of such notification. MS0005-E-00 IMPORTANT NOTICE - 17 - [AK2500B] 1999/12 ...