EVAL-AD421EB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD421EB' PDF : 14 Pages View PDF
AD421–LOOP-POWERED SPECIFICATIONS (Using DN25D1 as pass transistor as per Figure 3;
REF IN = REF OUT2; TA = TMIN to TMAX unless otherwise noted)
Parameter
OUTPUT CHARACTERISTICS
Current Loop Voltage Compliance3
Full-Scale Settling Time
Output Impedance
AC Loop Voltage Sensitivity
VOLTAGE REGULATOR
Output Voltage (VCC)
3 V Mode
3.3 V Mode
5 V Mode
Externally Available Current
Line Regulation
Load Regulation
B Versions2 Units
VCC + 2
350
8
25
2
V min
V max
ms typ
MΩ typ
µA/V typ
2.95/3.05
3.25/3.35
4.95/5.05
3.25
1
15
V min/V max
V min/V max
V min/V max
mA min
µV/V typ
µV/mA typ
Conditions/Comments
DN25D Breakdown Voltage
Settling Time to ± 0.1%, C1 = C2 = 10 nF, C3 = 3.3 nF
1200 Hz to 2200 Hz
3 V Nominal. LV Pin Connected to VCC
3.3 V Nominal. LV Pin Connected Through 0.01 µF to VCC
5 V Nominal. LV Pin Connected to COM
Assuming 4 mA Flowing in the Loop
DAC SPECIFICATIONS (VCC = +3 V to +5 V; REF IN = REF OUT2; TA = TMIN to TMAX unless otherwise noted)
Parameter
B Versions2 Units
Conditions/Comments
ACCURACY
Resolution
Monotonicity
Integral Nonlinearity
Offset (4 mA) @ +25°C4
Offset Drift
Total Output Error (20 mA) @ +25°C4
Total Output Drift
VCC Supply Sensitivity
VOLTAGE REFERENCE
REF OUT2
Output Voltage
Drift
16
16
± 0.01
± 0.1
± 25
± 0.2
± 50
50
2.49/2.51
± 40
Externally Available Current
VCC Supply Sensitivity
Output Impedance
Noise (0.1 Hz–10 Hz)
REF OUT1
Output Voltage
Drift
0.5
150
3
6
1.24/1.26
± 50
Externally Available Current
0.5
VCC Supply Sensitivity
150
Output Impedance
3
Noise (0.1 Hz–10 Hz)
4
REF IN
Input Resistance
40
Bits
Bits min
% of FS max
% of FS max
ppm of FS/°C max
% of FS max
ppm of FS/°C max
nA/mV max
FS = Full-Scale Output Current
VCC = 5 V
Includes On-Chip Reference Drift
VCC = 5 V
Includes On-Chip Reference Drift
25 nA/mV Typical
V min/V max
ppm/°C max
mA min
µV/V max
Ω typ
µV (p-p) typ
V min/V max
ppm/°C max
mA min
µV/V max
Ω typ
µV (p-p) typ
kΩ typ
2.5 V Nominal
20 ppm/°C Typical from –40°C to +25°C and
–2.5 ppm/°C Typical from +25°C to +85°C
15 µV/V Typical
1.25 V Nominal, 100 kΩ Load to COM5
20 ppm/°C Typical from –40°C to +25°C and
2 ppm/°C Typical from +25°C to +85°C
15 µV/V Typical
DIGITAL INPUTS
VIH (Logic 1)
VIL (Logic 0)
IIH
IIL
Data Coding
Data Rate
0.75 × VCC
0.25 × VCC
± 10
± 10
Binary
10
V min
V max
µA max
µA max
Mbps max
VIN = VCC
VIN = 0 V
POWER SUPPLIES
Operating Range
+2.95 to +5.05 V min to V max Functional to 7 V
Quiescent Current
@ VCC = 3 V
@ VCC = 5 V
650
µA max
475 µA Typical
750
µA max
575 µA Typical
NOTES
1The DN25D is available from Supertex, Inc., 1350 Bordeaux Drive, Sunnyvale, CA 94089.
2Temperature range is –40°C to +85°C.
3The max current loop voltage compliance is determined by the pass transistor breakdown voltage and is 350 V for the DN25D.
4With VCC = 3 V, the transfer function shifts negative by typically 0.25%; a 16 kΩ resistor connected between COM and LOOPRTN will approximately compensate for the VCC
supply sensitivity in moving from 5 V to 3 V by skewing the gain of the AD421.
5100 kΩ resistor only required if this reference is being used in application circuits.
Specifications subject to change without notice.
–2–
REV. C
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