Precision amplifier for bridge circuits
Error Monitoring (Diagnosis)
Output Voltage on Error (high)
Output Voltage without Error (low)
Output Current on Error
Output Current without Error
V
DIAG
V
DIAG
I
ERR
I
NOERR
V
DIAG
= 2.5V
V
DIAG
= 2.5V
1.5
-6
105
250
3.8
With regard to the sensing element
VCC
– 1.8
0.4
VCC
– 0.2
GND+
0.2
3.5
-3.5
6
-1.5
143
800
4.3
AM457
V
V
µA
µA
°C
µA
V
V
V
Threshold for Temperature Error Monitor-
T
ERR
ing
Threshold for Output Current (AMP) Error
Monitoring
Threshold for Supply Voltage Error
Monitoring
Threshold for High Input Voltage (AMP)
Error Monitoring
Threshold for Low Input Voltage (AMP)
Error Monitoring
Operational Amplifier (OP)
Offset Voltage
V
OS
vs. Temperature
V
OS
vs. Temperature
Input Bias Current
I
B
vs. Temperature
Input Resistance
Input Capacitance
Common Mode Input Range
Open Loop Gain
Output Voltage Range
Output Source Current
Output Load Capacitance
Gain Bandwidth Product
Slew Rate
V
OS
dV
OS
/dT
dV
OS
/dT
I
B
dI
B
/dT
R
IN
C
IN
CMIR
G
0
G
0.2mA
V
OUT
I
OUT
C
1
GBW
SR
G
GAIN
= 10;
C
1
= 1nF;
R
L
= 1.25kΩ
G
GAIN
= 100;
C
1
= 1nF;
R
L
= 25kΩ
PNP Open Collector Output
I
0ut
=0.1mA
I
0ut
=2mA
T
amb
= -45…125°C
V
CM
/
I
B,typ
(V
CM
= 0.5V)
T
amb
= -45…105°C
T
amb
= 105…125°C
I
IA,ERR
V
CC,ERR
V
IN,high,ERR
V
IN,low,ERR
VCC
– 0.8
0.9
±4
±10
80
100
6.25
30
0
90
75
0
1
0.9
0.2
1.4
0.7
0.5
110
90
±8
±40
±320
300
400
mV
µV/°C
µV
nA
pA/°C
MΩ
pF
1
V
dB
dB
VCC
– 0.2
2
5
V
mA
nF
MHz
V/µs
Table 1:
Specifications
Currents flowing into the IC are negative. Positive input of the o
perational amplifier (fixed internally): 0.1⋅V
CC
V
CM
Input Common Mode Voltage
CIRCUIT
Parameter
AMP Output Capacitor
Compensation Capacitor
DIAG
Output Capacitor (optional)
OP Output Capacitor (optional)
Stabilization Capacitor (optional)
EMV Protection Capacitor (optional)
Load Resistor
Symbol
C
1
C
2
C
3
C
4
C
5
C
6
R
L
20
1
100
470
Conditions
Min.
1
100
3.3
5
Typ.
Max.
5
Unit
nF
pF
nF
nF
nF
pF
kΩ
Table 2:
Circuit Components
Recommendation: Ceramic capacitor
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: www.analogmicro.de
Phone:
Fax:
Email:
+49 (0)6131/91 073 – 0
+49 (0)6131/91 073 – 30
info@analogmicro.de
May 2005
5/10
Rev. 2.2
AME [ ANALOG MICROELECTRONICS ]
