NJ88C50
DYNAMIC
Vdd = 5V ± 10%, Tamb = -40 to +85°C
Output signals
Min
Max
Unit
Typ
Parameter
Condition
Modulus control - MOD1 MOD2
Output voltage high
Output voltage low
Push-Pull output
IOH = 0.5mA
IOL = 0.5mA
Vdd-0.4
0
Vdd
0.4
V
V
Modulus output truth table
Prescaler modulus
MOD2
MOD1
R1
R2
R3
R4
0
0
1
1
1
0
0
1
DYNAMIC
Vdd = 5V, Tamb = -40 to +85°C
Output signals - Auxiliary synthesiser
Parameter
Condition
Min
Typ
Max
Unit
Output signal - PDA
Up current - See Note 5
0<VPD<4.35V
0.65<VPD<5V
-10%
-10%
+10%
+10%
10
µA
µA
nA
I
I
pda
Down current - See Note 5
Tristate
pda
DYNAMIC
Vdd = 5V, Tamb = -40 to +85°C
Output signals - Main synthesiser, proportional output
Condition
Min
Unit
Typ
Max
Parameter
Output signal - PDP
-10%
µA
µA
µA
µA
nA
0<VPD<4.55V, Strobe=0V
0.45<VPD<5V, Strobe=0V
0<VPD<4.55V, Strobe=5V
0.45<VPD<5V, Strobe=5V
+I .CN
bo
+10%
+10%
+10%
+10%
50
Iprop(0) Up see notes 1, 3 & 4
-10%
-I .CN
bo
Iprop(0) Down see notes 1, 3 & 4
+I .CN.2L+1
bo
-10%
Iprop(1) Up see notes 2&3
Iprop(1) Down see notes 2&3
Tristate
-10%
-I .CN.2L+1
bo
Notes
1. The typical value of IPROP (0) is set by the programmed value of CN and the current I
set by the external resistor
rs m
RSM, where I =I
bo rs m
/ 32. I is typically 32µA.
rs m
2. The typical value of IPROP (1) is set by the value of IPROP(0) and the programmed value of L.
3. The current output IPROP is specified between 100µA and 1mA.
4. The output current is monotonic over the CN range 128-255. In standard operation CN is set at a value > 128.
5. Where I
pda
depends on the value of current setting resistor on RSA pin (9). I
max = 250µA
pda
11
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