AD780BR Analog Devices Inc, AD780BR Datasheet - Page 9

• Manufacturer Part Number: AD780BR
• Description: IC PREC V-REF 2.5V/3.0V 8-SOIC
• Manufacturer: Analog Devices Inc

Specifications of AD780BR

• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Rohs Status: RoHS non-compliant
• Design Resources: Using AD8599 as an Ultralow Distortion Driver for the AD7991 (CN0043) Using AD8599 as an Ultralow Distortion Driver for the AD7995 (CN0044) Using AD8599 as an Ultralow Distortion Driver for the AD7999 (CN0045) Using AD7328 in Appls with Single-Ended Industrial-Level Signals (CN0047) AD5382 Channel Monitor Function (CN0012) AD5383 Channel Monitor Function (CN0015) AD5390/91/92 Channel Monitor Function (CN0030) Measuring -48 V High-Side Current Using AD629, AD8603, AD780, and AD7453 (CN0100) High Voltage, High Precision Current Sensing with Output Level Shifting Using AD8210 and AD8274 (CN0116)
• Reference Type: Series and Shunt, Programmable
• Voltage - Output: 2.5V, 3V
• Tolerance: ±1mV
• Temperature Coefficient: 3ppm/°C
• Voltage - Input: 4 ~ 36 V
• Number Of Channels: 1
• Current - Quiescent: 1mA
• Current - Output: 10mA
• Operating Temperature: -40°C ~ 85°C
• Peak Reflow Compatible (260 C): No
• Supply Voltage: 5V
• Output Voltage: 5V
• Leaded Process Compatible: No
• Interface Type: Parallel
• Fixed / Adjust / Prog: Programmable
• Output Voltage (max): 2.5/3V
• Reference Voltage Accuracy (max): 1
• Line Regulation: 10uV/V
• Load Regulation: 75uV/mA
• Input Voltage (max): 36V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Current - Cathode: -
• Lead Free Status / Rohs Status: Not Compliant

The dynamic load may be resistive and capacitive. For example,
the load may be connected via a long capacitive cable. Figure 18
and Figure 19 show the performance of the AD780 driving a
1000 pF, 0 mA to 10 mA load.
10mA
0mA
Figure 18. Capacitive Load Transient Response Test Circuit
1µF
I
V
Figure 17. Settling under Transient Resistive Load
LOAD
OUT
1µF
Figure 16. Transient Resistive Load Test Circuit
(C
L
= 0pF)
AD780
+V
2
4
AD780
IN
+V
2
4
IN
10µs/DIV
6
6
V
C
1000pF
L
L
V
L
249Ω
V
0V
OUT
249Ω
V
V
0V
OUT
OUT
V
OUT
Rev. E | Page 9 of 12
LINE REGULATION
Line regulation is a measure of change in output voltage due to
a specified change in input voltage. It is intended to simulate
worst-case unregulated supply conditions and is measured in
µV/V. Figure 20 shows typical performance with 4.0 V < V
15.0 V.
PRECISION REFERENCE FOR HIGH RESOLUTION
5 V DATA CONVERTERS
The AD780 is ideally suited to be the reference for most 5 V
high resolution ADCs. The AD780 is stable under any capacitive
load, has superior dynamic load performance, and its 3.0 V
output provides the converter with the maximum dynamic
range without requiring an additional and expensive buffer
amplifier. One of the many ADCs that the AD780 is suited for is
the AD7884, a 16-bit, high speed sampling ADC (see Figure 21).
This part previously needed a precision 5 V reference, resistor
divider, and buffer amplifier to do this function.
10mA
–100
–200
0mA
200
100
0
4
Figure 20. Output Voltage Change vs. Input Voltage
Figure 19. Settling under Dynamic Capacitive Load
I
V
(C
LOAD
T = 25°C
OUT
L
= 1000pF)
INPUT VOLTAGE (V)
10µs/DIV
10
AD780
1
5
IN
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