AD1580BRTZ-R2 Analog Devices Inc, AD1580BRTZ-R2 Datasheet - Page 7

• Manufacturer Part Number: AD1580BRTZ-R2
• Description: IC,VOLT REFERENCE,FIXED,1.225V,BIPOLAR,TO-236,3PIN,PLASTIC
• Manufacturer: Analog Devices Inc

Specifications of AD1580BRTZ-R2

• Package / Case: SOT-23-3, TO-236-3, Micro3™, SSD3, SST3
• Mounting Type: Surface Mount
• Current - Output: 10mA
• Voltage - Output: 1.225V
• Operating Temperature: -40°C ~ 85°C
• Temperature Coefficient: 50ppm/°C
• Tolerance: ±0.1%
• Number Of Channels: 1
• Reference Type: Shunt
• Current - Cathode: 50µA
• Fixed / Adjust / Prog: Precision
• Output Voltage (max): 1.225V
• Reference Voltage Accuracy (max): 0.1
• Load Regulation: 6mV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 3
• Package Type: SOT-23
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Current - Quiescent: -
• Lead Free Status / Rohs Status: Compliant

For example, the AD1580BRT initial tolerance is ±1 mV;
a ±50 ppm/°C temperature coefficient corresponds to an
error band of ±4 mV (50 × 10
unit is guaranteed to be 1.225 V ± 5 mV over the operating
temperature range.
Duplication of these results requires a combination of high
accuracy and stable temperature control in a test system.
Evaluation of the AD1580 produces a curve similar to that
in Figure 5 and Figure 13.
VOLTAGE OUTPUT NONLINEARITY vs.
TEMPERATURE
When a reference is used with data converters, it is important to
understand how temperature drift affects the overall converter
performance. The nonlinearity of the reference output drift
represents an additional error that is not easily calibrated out of
the system. This characteristic (see Figure 14) is generated by
normalizing the measured drift characteristic to the end point
average drift. The residual drift error of approximately 500 ppm
shows that the AD1580 is compatible with systems that require
10-bit accurate temperature performance.
1.2258
1.2256
1.2254
1.2252
1.2250
1.2248
1.2246
1.2244
1.2242
1.2240
1.2238
600
500
400
300
200
100
0
–55
–55
SLOPE = TC =
Figure 13. Output Voltage vs. Temperature
–35
–35
V
MIN
–15
Figure 14. Residual Drift Error
–15
SLOPE = TC =
(+85°C – +25°C) × 1.225 × 10
5
TEMPERATURE (°C)
5
TEMPERATURE (°C)
−6
25
(V
25
× 1.225 V × 65°C). Thus, the
MAX
V
O
(–40°C – +25°C) × 1.225 × 10
45
– V
45
O
)
65
(V
65
MIN
V
–6
MAX
– V
85
85
O
)
105
105
–6
125
125
Rev. D | Page 7 of 12
REVERSE VOLTAGE HYSTERESIS
A major requirement for high performance industrial
equipment manufacturers is a consistent output voltage at
nominal temperature following operation over the operating
temperature range. This characteristic is generated by measur-
ing the difference between the output voltage at +25°C after
operation at +85°C and the output, at +25°C after operation
at −40°C. Figure 15 displays the hysteresis associated with the
AD1580. This characteristic exists in all references and has been
minimized in the AD1580.
OUTPUT IMPEDANCE vs. FREQUENCY
Understanding the effect of the reverse dynamic output imped-
ance in a practical application may be important to successfully
apply the AD1580. A voltage divider is formed by the AD1580
output impedance and the external source impedance. When
an external source resistor of about 30 kΩ (I
1% of the noise from a 100 kHz switching power supply is devel-
oped at the output of the AD1580. Figure 16 shows how a 1 μF
load capacitor connected directly across the AD1580 reduces
the effect of power supply noise to less than 0.01%.
100
0.1
1k
10
40
35
30
25
20
15
10
–400
1
5
0
10
Figure 15. Reverse Voltage Hysteresis Distribution
ΔI
I
I
R
R
R
= 100µA
= 1mA
Figure 16. Output Impedance vs. Frequency
–300
= 0.1I
100
R
–200
HYSTERESIS VOLTAGE (µV)
–100
FREQUENCY (Hz)
1k
0
10k
100
200
R
C
= 100 μA) is used,
L
100k
= 0
300
C
L
AD1580
= 1µF
400
1M