Philips PM2519 - OQ 0063 Programmable Current Source

OQ 0063 Programmable Current Source
Pinner.
- oO o a Ns oa b Ww nN = = =
12
13
14
15
16
17
18
Name
Irs°
Cs
Ire
Vss
C clock
C clock
RNG B
V out
Cc comp.
+Vin
—Vin
10-7
Description
Ref. current adjustment
Smoothing Capacitor
! Ref Common
Supply
Range B
Output voltage
C. Compensation
+ Input
— input
Range C
Range A
Supply
GROUND
0@ 0063 VDD
ST4663
840706
With Rs the output current can be adjusted.
Smoothing capacitor for the switched currents.
Common connection of Rs and Rp.
Negative supply voltage
Capacitor for the clock-oscillator.
Range information (see 12, 13).
Output of the compensation amplifier.
Compensation capacitor for the compensation amplifier.
+ and — input of the compensation/protection amplifier.
Compensation: With the amplifier the current consumption of
the ADC is compensated during {2 measurements.
Protection: With the amplifier also the leak curent through the
protection diodes during (2 measurements is compensated,
Together with signal RNG B the signals determine the digital
range information from the OO 0059,
RNGA RNGB- RNGC
Measuring current
1 kQ
10 kQ
100 kQ
1MQ
10 MQ
Positive supply voltage.
Supply zero.
Output current.
Smoothing capacitor.
With Rp the temperature-coefficient of the reference current is
determined.