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ADATE207

Rev. 0 | Page 17 of 36

TEMPERATURE DIODE

ADATE207

100µA

TDIODE

TEMPERATURE DIODE

FORCE I, MEASURE V

Figure 12. Block Diagram of Temperature Diode

740

600

TEMPERATURE (°C)

120

720

700

680

660

640

620

100

Figure 13. Characteristic of Temperature Diode

The block diagram of the temperature diode is shown in Figure 12,

and its Output Voltage VS temperature characteristic is shown

in Figure 13. Note in Figure 12 that 100 μA is forced into the diode.

HIGH SPEED DIFFERENTIAL DCL INTERFACE

The ADATE207 uses a differential interface for connections to

the DCL. The comparator inputs have on-chip 50 Ω resistors for

termination, configured to support either 50 Ω parallel termi-

nation or 100 Ω differential termination. The comparator inputs

are compatible with LVPECL, LVDS, and most CML outputs.

For PECL termination, connect the termination pin to VCC − 2.0 V

or to an appropriate resistor to ground. For LVDS termination,

do not connect the termination pin. For CML termination,

either do not connect the termination pin or connect the

termination pin to an appropriate supply.

50Ω

COMP_CH0_P

COMP_CH0_T

COMP_CH0_N

50Ω

DIFFERENTIAL LVPECL INPUT

Figure 14. Differential Input with Termination Resistors

8mA

ADATE207

VOP

VON

50Ω

EXTERNAL

TERMINATION

REQUIRED

ESD

Figure 15. Differential Open Drain Output

The driver outputs are differential open-drain outputs. The

outputs require termination through an external resistor to a

positive supply and can be configured to be compatible with

most PECL, and CML inputs.

Their output currents can be programmed with a bias resistor to

ground on the REF_1K pin. If the REF_1K pin is left open

(>100 kΩ) then the drive current is a nominal 8 mA. If a

resistor is tied from REF_1K to ground, then the drive current

is adjustable with the resistance value. A 1 kΩ resistor yields a

nominal 8 mA output current swing. Less resistance results in

greater current. The relationship of drive current to resistance is

given approximately by

Drive_Current = 8 V/REXT

Best practice suggests limiting the external resistance value

between 800 Ω and 2500 Ω.

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