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BLOCK DIAGRAM

Output

Buffer

Output

Driver

50W

VCC

ControlSettings

4-Bit

Input Threshold

De-emphasis

OutputSwing

InputBandwidth

LOS AssertLevel

Power-On

Reset

-

Band GapVoltage

Referenceand

BiasCurrent

Generation

2-WireInterface &

ControlLogic

SDA

SCL

DIS

DIN+

DIN-

SDA

SCL

DIS

DOUT+

DOUT-

Equalizer

Stage

InputBuffer

with

Selectable

Bandwidth

Offset

Cancellation

LN 0

LN0

LN1

LN1

8-BitRegister

2-Bit

4-Bit + Select

7-Bit + Select

LossofSignal

Detection

LOS

VCC

GND

LOSR

LOSR

SWG

SWG

LOSL

LOSL

VTH

VTH

DE 0

DE0

DE 1

DE1

4-Bit

SEL_RATE

7-BitRegister

SEL_LOSL

8-BitRegister

50W

50W

VCC

50W

TLK1101E

SLLS845A – AUGUST 2007 – REVISED OCTOBER 2007

The output can be disabled using the DIS pin. The DIS and the LOS pin can be connected together to implement

a squelch function.

The de-emphasis, the output voltage swing, the input threshold voltage, the output disable, and the LOS assert

levels and ranges can alternatively be set using the two-wire serial interface through the SCL and SDA pins. The

external pin configuration is the default device setup method. The active device control method is selected

through register address 0 bit 0 (see Table 4 and Table 20). The two-wire serial interface also allows for the

control of the input bandwidth to optimize the device performance for various data rates.

The high input signal dynamic range ensures low jitter output signals even when overdriven with input signal

The low-frequency cut-off is low enough to support low-frequency control signals such as SAS and SATA

out-of-band (OOB) signals.

A simplified block diagram of the TLK1101E is shown in Figure 1. This compact, low power, 11.3-Gbps equalizer

consists of a high-speed data path with offset cancellation block combined with an analog input threshold

selection circuitry, a loss of signal detection block, a two-wire interface with a control-logic block, a bandgap

voltage reference, and a bias current generation block.

Figure 1. Simplified Block Diagram of the TLK1101E

2

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