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PDF STA1102R Data sheet ( Hoja de datos )
| Número de pieza | STA1102R | |
| Descripción | 2 differential-pair channel eSATA signal re-driver | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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STA1102R
3 Gbps, 2 differential-pair channel eSATA signal re-driver
Preliminary data
Features
■ Supports eSATA data rate of 1.5 Gbps and
3 Gbps
■ Supports complete eSATA bus of two 2-wire
differential-pair channels
■ Squelch detector for validity of input differential
signal
■ Single operating supply (VCC) range of 3.3 V ±
10%
■ Low power mode
■ 100 Ω CML I/Os
■ eSATA hot-plug capable
■ Low capacitance on all channels
■ 1-bit input equalizer regenerates the receiver
attenuated signal
■ 1-bit adjustable pre-emphasis and driver to
drive the transmitter outputs over long PCB
track lengths
■ Low output skew and jitter
■ Low ground bounce
■ Available in QFN20 (4 x 4 mm) package
www.DataSheefto4oUt.pcorimnt with flow-through pinout
■ -40 °C to 85 °C operating temperature range
QFN20
(4 x 4 mm)
Description
The STA1102R is a serial data signal re-driver. It
integrates two differential-pair channels suitable
for eSATA signals up to a 3 Gbps data rate, in
compliance with the SATA rev 2.6 specification.
An input detector is available at each channel,
which constantly monitors the input signal level for
output squelch functionality. If the detected
differential input is below a defined threshold, the
output is biased to the common mode voltage.
High-speed data paths and the flow-through
pinout minimize internal device jitter and simplify
board layout. The integrated input equalizer
improves signal integrity at the receiver due to
effects from lossy cables. A 1-bit adjustable pre-
emphasis is also integrated to drive the
transmitter outputs over long PCB track lengths.
The device can be set to a low-power mode by
disabling the output current drivers through the
EN pin.
Table 1. Device summary
Order code
STA1102RQTR
Package
QFN20 (4 x 4 mm)
Packing
Tape and reel
October 2009
Doc ID 16470 Rev 1
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to
change without notice.
1/17
www.st.com
17
1 page  
STA1102R
2 Functional description
Functional description
2.1
2.2
Equalizer
The integrated input equalizer reduces system jitter and attenuation from long or lossy
cables. Shaping is performed by the gain stage of the equalizer to compensate the signal.
Pre-emphasis
The STA1102R provides at each output a differential pair of 1-bit programmable
preemphasis to compensate for losses across long PCB tracks and interconnects after the
re-driver output. Below, the truth table of the pre-emphasis control is shown:
Table 3.
EN
0
1
1
1
1
Pre-emphasis truth table
D0 D1
xx
00
01
10
11
Functions
Low power mode:
Output driver disabled; output driven to HiZ
Normal operation mode:
both CH1 and CH2 0 dB pre-emphasis
Normal operation mode:
CH1 0 dB pre-emphasis; CH2 2.5 dB pre-emphasis
Normal operation mode:
CH1 2.5 dB pre-emphasis; CH2 0 dB pre-emphasis
Normal operation mode:
Both CH1 and CH2 2.5 dB pre-emphasis
2.3
www.DataSheet4U.com
Input termination
The STA1102R integrates precise 50 Ω ± 10% termination resistors, pulled up to VCm, on all
its differential input channels. External terminations are not required. This gives improved
performance and also minimizes the PCB board space. These on-chip termination resistors
should match the differential characteristic impedance of the transmission line.
Doc ID 16470 Rev 1
5/17
5 Page 
STA1102R
Recommended operating conditions
Table 8.
Symbol
AC electrical characteristic (continued)
Parameter
Test conditions Min
ZSE_TX Single-ended output impedance
RLDIFF_TX Differential output return loss
RLCM_TX Common mode output return loss
TR/F_TX Output rise/fall time
TSkew_TX Output differential skew
www.DataSheet4U.com
TJTX Total jitter
DJTX Deterministic jitter
RJTX Random jitter
-
f = 100 MHz to
300 MHz
f = 300 MHz to
600 MHz
f = 600 MHz to
1200 MHz
f = 1.2 GHz to
2.4 GHz
f = 2.4 GHz to
3.0 GHz
f = 100 MHz to
300 MHz
f = 300 MHz to
600 MHz
f = 600 MHz to
1200 MHz
f = 1.2 GHz to
2.4 GHz
f = 2.4 GHz to
3.0 GHz
20% to 80%
Mid-point of RX+
to mid-point of RX-
DR = 3 Gbps;
K28.5 pattern
DR = 3 Gbps;
K28.5 pattern
DR = 3 Gbps;
K28.7 pattern
40
14
8
6
6
3
5
5
2
1
1
67
-
-
-
-
Typ Max Unit
- -Ω
- - dB
- - dB
- - dB
- - dB
- - dB
- - dB
- - dB
- - dB
- - dB
- - dB
- 136 ps
- 20 ps
0.2 0.3 UIpp
0.13 0.2 UIpp
2.0 2.15 psrms
Doc ID 16470 Rev 1
11/17
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet STA1102R.PDF ] | |
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