GD16571 datasheet(3/7 Pages) ETC

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Pin List

Mnemonic:

Pin No.:

Pin Type:

Description:

DIN

DINQ

AC IN

Data inputs. Internally terminated in 50 W to DINT.

Internally biased to -1.3 V

DINT

ANL IN

Termination voltage for DIN and DINQ.

CKIN

CKINQ

AC IN

Clock inputs. Internally terminated in 50 W to CKINT.

Internally biased to -1.3 V.

CKINT

ANL IN

Termination voltage for CKIN and CKINQ.

IOUT

IOUTN

13, 14

11, 12

OPEN

COLLECTOR

Laser Driver Output (2.5 Gbit/s). IOUT and IOUTN sink a modula-

tion current, which is controlled by the pin VMOD. The current into

IOUT is high when data is high on DIN.

IPRE

OPEN

COLLECTOR

Pre-bias current output. IPRE sinks a current, which is controlled

by the pin VPRE.

VMOD

ANL IN

Modulation current control input. The control system is made as a

current mirror. VMOD sinks a current proportional to the modula-

tion current. This current is approximately 3/80 times “The modu-

lation current”.

VPRE

ANL IN

Pre-bias current control input. The control system is made as a

current mirror. VPRE sinks a current proportional to the pre-bias

current. This current is approximately 3/500 times “The pre-bias

current”.

CKSEL

ECL IN

When CKSEL is low data is retimed. Otherwise data is bypassed

the retiming.

SYM

ANL IN

SYM controls the mark-space ratio of the output. Decreasing the

voltage of the SYM pin decreases the pulse width of a current

high into the IOUT pin.

MARKP

MARKN

ANL OUT

Mark-space monitor outputs. High impedance CML outputs. The

output voltage of the MARKP pin is the same as the voltage on

the DIN input.

VADJBUF

VADJEF

ANL IN

Pins used to optimise the performance of the output in terms of

overshoot and undershoot. Typically optimum performance will be

achieved when shorted to VMOD.

VDD

2, 4, 10, 15

PWR

Ground pins for laser driver part.

VDDCONT

PWR

Ground pin for modulation current control system.

VDDR

PWR

Ground pin for retiming part.

VEE

5, 8, 23

PWR

Negative supply pins for laser driver part.

VEEP

PWR

Negative supply pin for output driver.

VEEB

PWR

Negative supply pin for pre-bias circuitry.

VEER

PWR

Negative supply pin for retiming part.

Not Connected.

Heat sink

Package back

Connected to VEE.

Data Sheet Rev.: 10

GD16571

Page 3 of 7

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