|
|
PDF AD628 Data sheet ( Hoja de datos )
| Número de pieza | AD628 | |
| Descripción | High Common-Mode Voltage Programmable Gain Difference Amplifier | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de AD628 (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
|
No Preview Available !
High Common-Mode Voltage,
Programmable Gain Difference Amplifier
AD628
FEATURES
High common-mode input voltage range
±120 V at VS = ±15 V
Gain range 0.1 to 100
Operating temperature range: −40°C to +85°C
Supply voltage range
Dual supply: ±2.25 V to ±18 V
Single supply: 4.5 V to 36 V
Excellent ac and dc performance
Offset temperature stability RTI: 10 μV/°C maximum
Offset: ±1.5 V mV maximum
CMRR RTI: 75 dB minimum, dc to 500 Hz, G = +1
APPLICATIONS
High voltage current shunt sensing
Programmable logic controllers
Analog input front end signal conditioning
+5 V, +10 V, ±5 V, ±10 V, and 4 to 20 mA
Isolation
Sensor signal conditioning
Power supply monitoring
Electrohydraulic controls
Motor controls
GENERAL DESCRIPTION
The AD628 is a precision difference amplifier that combines
excellent dc performance with high common-mode rejection
over a wide range of frequencies. When used to scale high
voltages, it allows simple conversion of standard control
voltages or currents for use with single-supply ADCs. A
wideband feedback loop minimizes distortion effects due to
capacitor charging of Σ-Δ ADCs.
A reference pin (VREF) provides a dc offset for converting bipolar
to single-sided signals. The AD628 converts +5 V, +10 V, ±5 V,
±10 V, and 4 to 20 mA input signals to a single-ended output
within the input range of single-supply ADCs.
The AD628 has an input common mode and differential mode
operating range of ±120 V. The high common mode, input
impedance makes the device well suited for high voltage
measurements across a shunt resistor. The inverting input of
the buffer amplifier is available for making a remote Kelvin
connection.
FUNCTIONAL BLOCK DIAGRAM
REXT2
REXT1
+VS
7
6 RG
100kΩ
–IN 8
100kΩ
+IN 1
10kΩ
G = +0.1
–IN
A1
+IN
10kΩ
2
–VS
3
VREF
10kΩ
4
CFILT
–IN
A2
+IN
OUT
5
AD628
Figure 1.
130
120
110
100
90
80
70
60
50
40
30
10
VS = ±15V
VS = ±2.5V
100 1k 10k
FREQUENCY (Hz)
Figure 2. CMRR vs. Frequency of the AD628
100k
A precision 10 kΩ resistor connected to an external pin is
provided for either a low-pass filter or to attenuate large
differential input signals. A single capacitor implements a low-
pass filter. The AD628 operates from single and dual supplies
and is available in an 8-lead SOIC_N or an 8-lead MSOP. It
operates over the standard industrial temperature range of
−40°C to +85°C.
Rev. G
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
www.analog.com
Fax: 781.461.3113 ©2002–2007 Analog Devices, Inc. All rights reserved.
1 page  
AD628
TA = 25°C, VS = 5 V, RL = 2 kΩ, REXT1 = 10 kΩ, REXT2 = ∞, VREF = 2.5 V, unless otherwise noted.
Table 2.
Parameter
DIFFERENTIAL AND OUTPUT AMPLIFIER
Gain Equation
Gain Range
Offset Voltage
vs. Temperature
CMRR3
Minimum CMRR Over Temperature
vs. Temperature
PSRR (RTI)
Input Voltage Range
Common Mode4
Differential
Dynamic Response
Small Signal Bandwidth – 3 dB
Full Power Bandwidth
Settling Time
Slew Rate
Noise (RTI)
Spectral Density
DIFFERENTIAL AMPLIFIER
Gain
Error
Nonlinearity
vs. Temperature
Offset Voltage
vs. Temperature
Input Impedance
Differential
Common Mode
CMRR5
Minimum CMRR Over Temperature
vs. Temperature
Output Resistance
Error
OUTPUT AMPLIFIER
Gain Equation
Nonlinearity
Output Offset Voltage
vs. Temperature
Output Voltage Swing
Bias Current
Offset Current
CMRR
Open-Loop Gain
Conditions
G = +0.1(1+ REXT1/REXT2)
See Figure 29
VCM = 2.25 V; RTI of input pins2;
output amplifier G = +1
RTI of input pins; G = +0.1 to +100
500 Hz
−40°C to +85°C
VS = 4.5 V to 10 V
G = +0.1
G = +0.1; to 0.01%, 30 V step
1 kHz
0.1 Hz to 10 Hz
RTI of input pins
RTI of input pins; G = +0.1 to +100
500 Hz
−40°C to +85°C
G = (1 + REXT1/REXT2)
G = +1, VOUT = 1 V to 4 V
RTI of output amplifier
RL = 10 kΩ
RL = 2 kΩ
VCM = 1 V to 4 V
VOUT = 1 V to 4 V
AD628AR
AD628ARM
Min Typ Max Min Typ Max Unit
0.11
−3.0
6
75
75
70
1
77 94
100 0.11
+3.0 −3.0
15 6
75
75
70
41
77 94
V/V
100 V/V
+3.0 mV
15 μV/°C
dB
dB
dB
4 (μV/V)/°C
dB
−12 +17 −12 +17 V
−15 +15 −15 +15 V
440 440 kHz
30 30 kHz
15 15 μs
0.3 0.3 V/μs
350 350 nV/√Hz
15 15 μV p-p
0.1 0.1 V/V
–0.1 +0.01 +0.1 –0.1 +0.01 +0.1 %
3 3 ppm
3 10
3 10 ppm
−2.5 +2.5 −2.5 +2.5 mV
10 10 μV/°C
220
55
75
75
70
1
10
−0.1
220
55
75
75
70
41
10
+0.1 −0.1
kΩ
kΩ
dB
dB
dB
4 (μV/V)/°C
kΩ
+0.1 %
−0.15
0.9
1
1.5
0.2
130
130
0.5
+0.15
0.6
4.1
4
3
0.5
−0.15
0.9
1
130
130
1.5
0.2
0.5
+0.15
0.6
4.1
4
3
0.5
V/V
ppm
mV
μV/°C
V
V
nA
nA
dB
dB
Rev. G | Page 5 of 20
5 Page 
100µV
100
90
VS = ±2.5V
RL = 1kΩ
RL = 2kΩ
RL = 10kΩ
10
0
500mV
OUTPUT VOLTAGE (V)
Figure 17. Normalized Gain Error vs. VOUT, VS = ±2.5 V
4
3
2
1
0
–40 –20
0 20 40 60
TEMPERATURE (°C)
80
Figure 18. Bias Current vs. Temperature Buffer
100
15
–40°C
10 –25°C
+85°C
5 +25°C
0
–40°C
–5 –25°C
+85°C
+25°C
–10
–15
0
5 10 15 20
OUTPUT CURRENT (mA)
25
Figure 19. Output Voltage Operating Range vs. Output Current
500mV
100
90
AD628
10
0
50mV
4µs
Figure 20. Small Signal Pulse Response,
RL = 2 kΩ, CL = 0 pF, Top: Input, Bottom: Output
500mV
100
90
10
0
50mV
4µs
Figure 21. Small Signal Pulse Response,
RL = 2 kΩ, CL = 1000 pF, Top: Input, Bottom: Output
100
90
10.0V
10.0V
10
0
40µs
Figure 22. Large Signal Pulse Response,
RL = 2 kΩ, CL = 1000 pF, Top: Input, Bottom: Output
Rev. G | Page 11 of 20
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet AD628.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| AD620 | Low Power Instrumentation Amplifier | Analog Devices |
| AD621 | Low Drift/ Low Power Instrumentation Amplifier | Analog Devices |
| AD622 | Low Cost Instrumentation Amplifier | Analog Devices |
| AD623 | Low Cost Instrumentation Amplifier | Analog Devices |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |