10

NJ88C50

Notes

1. Source impedance = 50

Ω

2. Virtual earth input amplifier, therfore low impedance for small signals. Impedance is high once signal amplitude exceeds

typically

±0.125V.

3. Input amplifier may become unstable for higher values of Z

S

.

DYNAMIC

AC Characteristics

Parameter

Data and strobe

Input voltage high

Input voltage low

Input capacitance

Input current

Clock

Input voltage high

Input voltage low

Input capacitance

Input current

Input frequency

Current setting pins

Input Signal RSA

Input current

Input Signal RSM

Input current

Input Signal RSC

Input current

Input signals - Logic and current defining pins

Min

0

0

Typ

80

32

12.8

Max

0.8

10

10

0.8

10

10

10

Unit

V

V

pF

µA

V

V

pF

µA

MHz

µA

µA

µA

Condition

Notes 1, 4

Notes 2, 4

Notes 3, 4

Notes

1. The current set on pin RSA will be scaled up on chip by a factor of 3 to give the value of the auxiliary phase detector

output.

2. The current set on pin RSM will be scaled down on chip by a factor of 32 to provide the current

Ibo to the main phase

detector which gives the outputs

Iprop and Iint.

3. The current set on pin RSC will be scaled down on chip by a factor of 128 to provide the current

Ico to the main phase

detector which gives the outputs

Icomp and Icomp 2.

4. The voltage on each of the three current setting pins (RSA, RSM, RSC) is approximately 4V.

Therefore to give a typical current of 32

µA on RSM for example, a 125kΩ resistor connected between the pin and GND

would be required.