Precision amplifier for bridge circuits
AM457
Error Monitoring (Diagnosis)
Output Voltage on Error (high)
Output Voltage without Error (low)
Output Current on Error
VDIAG
VDIAG
IERR
VCC – 0.2
GND+ 0.2
3.5
V
V
µA
µA
°C
V
V
DIAG = 2.5V
DIAG = 2.5V
1.5
-6
6
-1.5
143
Output Current without Error
INOERR
-3.5
Threshold for Temperature Error Monitor- TERR
105
ing
Threshold for Output Current (AMP) Error IIA,ERR
250
3.8
800
4.3
µA
V
Monitoring
Threshold for Supply Voltage Error
Monitoring
VCC,ERR
Threshold for High Input Voltage (AMP)
Error Monitoring
Threshold for Low Input Voltage (AMP)
Error Monitoring
VIN,high,ERR
VIN,low,ERR
With regard to the sensing element VCC – 1.8
VCC – 0.8
V
V
0.4
0.9
Operational Amplifier (OP)
Offset Voltage
VOS
mV
µV/°C
µV
±4
±8
±40
±320
300
V
OS vs. Temperature
OS vs. Temperature
dVOS/dT
dVOS/dT
IB
dIB/dT
RIN
Tamb= -45…105°C
Tamb= 105…125°C
±10
V
Input Bias Current
IB vs. Temperature
Input Resistance
80
100
6.25
30
0.5
110
90
nA
pA/°C
Tamb= -45…125°C
400
VCM / IB,typ (VCM = 0.5V)
MΩ
pF
V
Input Capacitance
Common Mode Input Range
Open Loop Gain
CIN
CMIR
G0
G0.2mA
VOUT
IOUT
C1
GBW
SR
0
90
75
0
1
I
I
0ut =0.1mA
0ut =2mA
dB
dB
Output Voltage Range
Output Source Current
Output Load Capacitance
Gain Bandwidth Product
Slew Rate
VCC – 0.2
V
mA
nF
MHz
V/µs
PNP Open Collector Output
2
5
1
0.9
0.2
1.4
0.7
G
GAIN = 10; C1 = 1nF; RL = 1.25kΩ
GAIN = 100; C1 = 1nF; RL = 25kΩ
G
Table 1: Specifications
Currents flowing into the IC are negative. Positive input of the operational amplifier (fixed internally): 0.1⋅VCC
V
CM Input Common Mode Voltage
CIRCUIT
Parameter
Symbol
C1
Conditions
Min.
Typ.
Max.
Unit
AMP Output Capacitor
Compensation Capacitor
1
5
nF
pF
nF
nF
nF
pF
kΩ
C2
C3
C4
C5
C6
RL
100
3.3
DIAG Output Capacitor (optional)
OP Output Capacitor (optional)
Stabilization Capacitor (optional)
EMV Protection Capacitor (optional)
Load Resistor
1
5
100
470
20
Table 2: Circuit Components
Recommendation: Ceramic capacitor
analog microelectronics
May 2005
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
Phone: +49 (0)6131/91 073 – 0
Fax: +49 (0)6131/91 073 – 30
Email: info@analogmicro.de
5/10
Rev. 2.2
AME [ ANALOG MICROELECTRONICS ]
