tda5153x NXP Semiconductors, tda5153x Datasheet - Page 22

• Manufacturer Part Number: tda5153x
• Description: Pre-amplifier Hard Disk Drive With Mr-read/inductive Write Heads
• Manufacturer: NXP Semiconductors

Philips Semiconductors
5. The PSRR (in dB) is defined as input referred ratio:
6. This refers to the crosstalk from SCLK and SDATA
7. A 200 mV peak-to-peak signal is applied to SCLK or
Table 1 Noise figure
1997 Jul 02
Pre-amplifier for Hard Disk Drive (HDD)
with MR-read/inductive write heads
Where G
gain, and G
gain. The CMRR (in dB) is defined as input referred
ratio:
where G
gain and G
output gain. Flex and board lay-out may affect
significantly these parameters.
inputs via the read inputs to RDx
can be distinguished:
a) With SEN LOW, SCLK and SDATA are prohibited
b) Programming via the serial interface is done with
SDATA inputs at 25 MHz, and measurement is
performed at RDx
PSRR
from entering the device and crosstalk is low.
SEN HIGH. Then crosstalk can occur. A careful
design of the board or flex-foil is required in order
not to get crosstalk via this path.
CMRR
R
=
MR
v
v
20
25
30
is the differential input to differential output
is the differential input to differential output
20 log
cm
p
( )
is the power supply to differential output
is the common mode input to differential
=
20 log
G
------ -
G
RDy.
p
v
---------- -
G
G
cm
v
I
RDy. Two cases
MR
= 7 mA
2.7
2.8
2.9
22
8. The rise and fall times depend on the write
9. The write current rise/fall time asymmetry is defined by
10. Write-to-read recovery time includes the write mode to
11. In read mode, the head switching, standby to read
12. Write settle time includes read mode to write mode
13. The typical supply current in read mode depends on
14. The typical supply current in write mode also depends
amplifier-write head combination. L
the components on the evaluation board. Parasitic
capacitances also limit the performance.
read mode switching using the R/W pin on the same
head (see Fig.6). The AC signal reaches its full
amplitude few tenth of ns after appearing at the reader
RDx and RDy outputs.
active switching and changing MR current include fast
current settling (see Fig.7). Same note regarding the
AC signals at the reader outputs as above.
switching using the R/W pin.
the bias current for the MR element.
on the write current.
---------------------- -
2 t
t
I
r
MR
r
–
+
t
F (dB)
f
t
= 10 mA
f
2.9
3.0
3.1
Preliminary specification
I
MR
h
and R
= 15 mA
TDA5153
3.1
3.3
3.5
h
represent