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PDF ADA4530-1 Data sheet ( Hoja de datos )
| Número de pieza | ADA4530-1 | |
| Descripción | Femtoampere Input Bias Current Electrometer Amplifier | |
| Fabricantes | Analog Devices | |
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Data Sheet
Femtoampere Input Bias Current
Electrometer Amplifier
ADA4530-1
FEATURES
Low input bias current
±20 fA maximum at TA = 25°C (guaranteed at production test)
± 20 fA maximum at −40°C < TA < +85°C
± 250 fA maximum at −40°C < TA < +125°C (guaranteed at
production test)
Low offset voltage: 50 μV maximum over specified CMRR range
Offset drift: 0.13 μV/°C typical, 0.5 μV/°C maximum
Integrated guard buffer with 100 μV maximum offset
Low voltage noise density: 14 nV/√Hz at 10 kHz
Wide bandwidth: 2 MHz unity-gain crossover
Supply voltage: 4.5 V to 16 V (±2.25 V to ±8 V)
Operating temperature: −40°C to +125°C
APPLICATIONS
Laboratory and analytical instrumentation:
spectrophotometers, chromatographs, mass
spectrometers, and potentiostatic and amperostatic
coulometry
Instrumentation: picoammeters and coulombmeters
Transimpedance amplifier (TIA) for photodiodes, ion
chambers, and working electrode measurements
High impedance buffering for chemical sensors and
capacitive sensors
GENERAL DESCRIPTION
The ADA4530-1 is a femtoampere (10−15 A) level input bias
current operational amplifier suitable for use as an electrometer
that also includes an integrated guard buffer. It has an operating
voltage range of 4.5 V to 16 V enabling it to operate in conven-
tional 5 V and 10 V single supply systems as well as ±2.5 V and
±5 V dual supply systems.
It provides ultralow input bias currents that are production
tested at temperature to ensure the device meets its perfor-
mance goals in user systems. The integrated guard buffer is
provided to isolate the input pins from leakage in the printed
circuit board (PCB), minimize board component count, and
enable ease of system design. The ADA4530-1 is available in an
industry-standard surface-mount 8-lead SOIC package with a
unique pinout optimized to prevent signals from coupling
between the sensitive input pins, the power supplies, and the
output pin while enabling easy routing of the guard ring traces.
The ADA4530-1 also offers low offset voltage, low offset drift,
and low voltage and current noise needed for the types of
applications that require such low leakages. To maximize the
dynamic range of the system, the ADA4530-1 has a rail-to-rail
PIN CONNECTION DIAGRAM
ADA4530-1
+IN 1
GRD 2
IC 3
V– 4
8 –IN
7 GRD
6 OUT
5 V+
NOTES
1. IC = INTERNAL CONNECTION. THIS
PIN MUST BE CONNECTED TO V–
OR LEFT UNCONNECTED.
Figure 1.
output stage that can typically drive to within 30 mV of the
supply rails under a 10 kΩ load.
The ADA4530-1 operates over the −40°C to +125°C industrial
temperature range and is available in an 8-lead SOIC package.
1000
100
VSY = 10V
VCM = VSY/2
RH < 10%
–40°C TO +125°C LIMIT
–40°C TO +85°C LIMIT
10
1
0.1
0.01
IIBB+–
0.001
0
10 20 30 40 50 60 70 80 90 100 110 120 130
TEMPERATURE (°C)
Figure 2. Input Bias Current (IB) vs. Temperature, VSY = 10 V
Rev. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2015–2016 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADA4530-1
Data Sheet
Parameter1
Phase Margin
Settling Time to 0.1%
EMI Rejection Ratio of +IN
NOISE PERFORMANCE
Peak-to-Peak Voltage Noise
Voltage Noise Density
Current Noise Density
Total Harmonic Distortion + Noise
Bandwidth = 90 kHz
Bandwidth = 500 kHz
GUARD BUFFER
Guard Offset Voltage2, 4, 5
Guard Offset Voltage Drift2, 4
Output Impedance
Output Voltage Range
−3 dB Bandwidth
Symbol
ΦM
tS
EMIRR
Test Conditions/Comments
VIN = 10 mV rms, RL = 10 kΩ, CL = 10 pF,
AVO = 1
VIN = 0.5 V step, RL = 10 kΩ, CL= 10 pF,
AV = −1
VIN = 100 mV peak, f = 400 MHz
VIN = 100 mV peak, f = 900 MHz
VIN = 100 mV peak, f = 1800 MHz
VIN = 100 mV peak, f = 2400 MHz
eN p-p
eN
IN
THD + N
f = 0.1 Hz to 10 Hz
f = 10 Hz
f = 1 kHz
f = 10 kHz
f = 0.1 Hz
AV = 1, f = 1 kHz, VIN = 0.5 V rms
VGOS
ΔVGOS/ΔT
ZGOUT
f−3dBGUARD
VCM = 1.5 V to 3 V
VCM = 1.5 V to 3 V, 0°C < TA < 125°C
VCM = 1.5 V to 3 V, −40°C < TA < 0°C
VCM = 0.1 V to 3 V
0°C < TA < +125°C
−40°C < TA < 0°C
VGOS < 150 μV
VIN = 10 mV rms, CL = 10 pF
Min
0.1
Typ
62
5
50
60
80
90
4
80
16
14
0.07
0.003
0.0045
15
0.18
1.4
1
5.5
Max
100
120
250
150
1
7
3
1 These specifications represent the performance for 5 V ± 10% power supplies. All specifications are measured at the worst case 4.5 V supply voltage.
2 The maximum specifications at −40°C < TA < +85°C and −40°C < TA < 0°C are guaranteed from characterization.
3 RH is relative humidity (see the Humidity Effects section for more information).
4 The typical specifications are equal to the average plus the standard deviation of the distribution from characterization.
5 The guard offset voltage is the voltage difference between the guard output and the noninverting input.
Unit
Degrees
μs
dB
dB
dB
dB
μV p-p
nV/√Hz
nV/√Hz
nV/√Hz
fA/√Hz
%
%
μV
μV
μV
μV
μV/°C
μV/°C
kΩ
V
MHz
Rev. A | Page 4 of 50
5 Page 
ADA4530-1
Data Sheet
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
ADA4530-1
+IN 1
GRD 2
IC 3
V– 4
8 –IN
7 GRD
6 OUT
5 V+
Table 6. Pin Function Descriptions
Pin No.
Mnemonic
1 +IN
2 GRD
3 IC
4 V−
5 V+
6 OUT
7 GRD
8 −IN
NOTES
1. IC = INTERNAL CONNECTION. THIS
PIN MUST BE CONNECTED TO V–
OR LEFT UNCONNECTED.
Figure 3. Pin Configuration
Description
Noninverting Input.
Guard.
Internal Connection. This pin must be connected to V− or left unconnected.
Negative Supply Voltage.
Positive Supply Voltage.
Output.
Guard.
Inverting Input.
Rev. A | Page 10 of 50
11 Page | ||
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