1B21AN Analog Devices Inc, 1B21AN Datasheet - Page 6

• Manufacturer Part Number: 1B21AN
• Description: IC CONV V TO I HYBRID 38-DIP
• Manufacturer: Analog Devices Inc
• Type: Voltage and Current Controllerr

Specifications of 1B21AN

• Rohs Status: RoHS non-compliant
• Full Scale: ±50ppm/°C
• Linearity: ±0.02%
• Mounting Type: Through Hole
• Package / Case: 38-DIP (0.500", 12.70mm), 8 Leads
• Ic Function: Voltage To Current Converter IC
• Supply Voltage Range: 14.25V To 15.75V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: DIP
• No. Of Pins: 38
• Lead Free Status / Rohs Status: Not Compliant

1B21
TC Considerations of External Resistors
The specifications for gain and offset temperature coefficient
(TC) for the IB21 excluded the effects of external components.
The total gain TC for the circuit in Figure 4 is
The offset TC is also affected by the thermal stability of the
internal voltage reference and its contribution is
Gain TC = 1B21 Gain TC + (Tracking TC of R
Ref TC = (V
Total Offset TC = 1B21 Offset TC + Ref TC
Tracking TC of R
REF
)(R
F
/R
O
)(4 mA/V)(TC of V
F
and R
O
)/1 × 10
REF
6
+
F
and R
I
)
Rev. C | Page 6 of 8
Specifically using R
absolute TCs of ±25 ppm/°C
Similarly, when using a resistor network with a tracking spec
of ±5 ppm/°C, the total gain TC is ±55 ppm/°C and the total
offset TC is ±400 nA/°C.
Gain TC = 50 + (25 + 25) = 100 ppm/°C
Offset TC = 300 + (6.225 V)(20k/124.3 k)(4 mA/V)
(20 + 25 + 25)/1 × 10
F
, R
I
and R
6
= ±580 nA/°C
O
from Case 3 in Table 2, with