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PDF TA8552AFN Data sheet ( Hoja de datos )
| Número de pieza | TA8552AFN | |
| Descripción | PLL DATA SYNCHRONIZER FOR DAT STREAMER | |
| Fabricantes | Toshiba Semiconductor | |
| Logotipo |  |
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TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic
TA8552AFN
TA8552AFN
PLL Data Synchronizer For DAT Streamer
The TA8552AFN is PLL data synchronizer for digital audio tape
(DAT) strteamer, digital data storage (DDS).
Features
· The TA8552AFN incorporates edge detector, data
synchronizer, and latch for data separator.
Also the TA8552AFN is available to correspond to ×1, ×2 and
×3 of data transfer rates by adjusting external devices.
· The data synchronizer is avalable to correspond to ±7%
variation of data transfer rate.
Weight: 0.17g (typ.)
· By employing full differential signal processing in PLL loop,
the TA8552AFN eliminates the influence of external noise.
Fast & stable locking is realized by switching between the frequency
detective mode and the phase detective mode.
· Operating power supply voltage range: 4.5V to 5.5V
Pin Connectoion
Top view
· Small package; SSOP30−P−300−0.65
NC 1
30
RVCO1 2
29
Handle with care to prevent devices from deterioration by static electricity.
AGND2 3
28
CVCO1 4
27
RVCO2 5
26
CVCO2 6
25
AVCC2 7
24
TMON1 8
23
TMON2 9
22
XTMON2 10
21
V TTLO 11
20
MODESEL 12
19
TSTCPMP 13
18
RD 14
17
XRD 15
16
COB
COA
AGND1
RCP2
RCP1
AVCC1
DETSEL
TSTCLK
DVCC3
PBDT
PBCK
DGND3
TSTSEL2
REFCLK
TSTSEL1
1 2002-10-30
1 page  
TA8552AFN
Electrical Characteristic (unless otherwise specified, Ta = 27°C, VCC = 5.0V)
Parameter
High level input voltage (1)
Low level input voltage (1)
High level input current (1)
Low level input current (1)
High level input voltage (2)
Symbol
VIH
VIL
IIH
IIL
VIHE
Test
Circuit
Test Condition
― TTL input pins
― TTL input pins
― TTL input pins
― TTL input pins
― ECL input pins
Min.
2.0
―
―
―
VCC
-1.0
Typ.
―
―
―
―
―
Low level input voltage (2)
VILE
― ECL input pins
――
High level input current (2)
Low level input current (2)
High level output voltage (1)
Low level output voltage (1)
Output rise time (1)
Output fall time (1)
Input voltage range to VTTLO
terminal
IIHE
IILE
VOH
VOL
TOR
TOF
VTTLO
― ECL input pins
― ECL input pins
―
TTL output pins
IOH = 400µA
―
TTL output pins
IOL = 4mA
―
TTL output pins 1.5V to 3.5V
CL≤30pF
―
TTL output pins 3.5V to 1.5V
CL≤30pF
―
―
―
VTTLO
-0.2
―
―
―
―
*1 ―
*1 ―
2.7
―
―
―
Max. Unit
―
0.4
20
-360
V
V
µA
µA
―V
VCC
-1.5
2.0
1.6
VTTLO
+0.2
V
mA
mA
V
1.0 V
5 ns
5 ns
3.3 V
*1; Design guaranteed value.
Charge Pump (unless otherwise specified, Ta = 27°C, VCC = 5.0V)
Parameter
Range of output current setting
Accuracy of output current
setting
Leak current
Symbol
ICP
Iacu
Ireak
Test
Circuit
Condition
― At normal mode
― At serching mode
― At normal mode
― At serching mode
Between COA pin and COB pin,
at high impedance
*1
*2
Min.
30
―
-6
-8
-3.5
Typ.
―
―
―
―
Max.
―
800
+6
+8
+3.5
Unit
µA
%
µA
*1; Output current is set by an external resistor (Rcp1), as following;
2×1.3 / Rcp1 = (output current at normal mode).
*2; Output current is set by external resisters (Rcp1, Rcp2), as following;
2×1.3 / Rcp1+8×1.3 / Rcp2 = (output current at search mode).
(Note) The above values are all at open loop.
5 2002-10-30
5 Page 
TA8552AFN
Modesel Switching Function
The TA8552AFN has a function to correspond with the high-speed serching mode of DAT streamer. In the
searching mode, the data transfer rate will shift with small percentage error. The TA8552AFN is available to
solve this problem by extending the lock-in-range (∆ωL). In the serching mode the current of charge pump will
be increased to raise the phase detecter gain, then the lock-in-range (∆ωL) will extend.
This function is selected by modesel (12pin).
(H: Normal mode / L: Searching mode)
【Calculation of the charge pump's current in the searching mode】
The charge pump's current in the searching mode is estimated as the following (the shift rateX of data,
transfer is assumed as X = 7% in this example);
Ichp
=
fM ´ X´2p
R´K 0
´ 8p
=
28.224´106 ´0.07´2´3.14
1.5´103 ´251.3´106
´ 8 ´ 3.14
=
830 ´10-6 (A)
When "L" level voltage inputs to modesel (12pin), the charge pump's current (Ichp) increases. In the
normal mode, the charge pump's current (Icp1) is set by an external resister (Rcp1). And in the searching
mode, another current (Icp2), is set by an external resisiter (Rcp2), adds to Icp1.
This (Rcp2) is the resister to be connected with RCP2 (27pin)
The additional current (Icp2) is determined by the following:
Icp2 = 8×1.3 / Rcp2
Therefore, Rcp2 is estimated as the following:
Rcp2
=
8´1.3
830´10-6 -50´10-6
= 13.3 ´103 W
Modesel function is summarized by the followings
Mode
Modesel (12pin)
Charge pump current Ichp
Setting definition
Normal Mode
H
Icp1
2×1.3 / Rcp1
High-speed Searghing
Mode
L
Icp1+Icp2
2×1.3 / Rcp1+8×1.3 / Rcp2
11 2002-10-30
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TA8552AFN.PDF ] | |
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