Precision amplifier for bridge circuits

AM467

analog microelectronics

February 2011

Analog Microelectronics GmbH

Phone:

+49 (0)6131/91 073 – 0

4/9

An der Fahrt 13, D – 55124 Mainz

Fax:

+49 (0)6131/91 073 – 30

Rev. 1.1

Internet: http://www.analogmicro.de

Email:

info@analogmicro.de

ELECTRICAL SPECIFICATIONS

(with reference to the example application)

Parameter

Symbol

Conditions

Min.

Typ.

Max.

Unit

Voltage Range

4.5

5

5.5

V

Quiescent Current

170

320

530

µA

Temperature Specifications

Operating

–45

125

°C

Storage

–55

150

°C

Junction

150

°C

Amplifier AMP

Offset Voltage

±

0.1

±

0.3

mV

±

0.5

±

3

µV/°C

±

6

µV/°C

Input Bias Current

30

200

nA

–0.13

–0.6

nA/°C

Differential Input Voltage

See Figure 2

±

5

±

100

mV

Input Offset Current

±

0.5

±

5

nA

±

2.5

±

30

pA/°C

Input Resistance

80

M

Ω

Input Capacitance

By design

90

pF

Common Mode Input Range

CMIR

1

3.7

V

Common Mode Rejection Ratio

CMRR

100

120

dB

Open Loop Gain

C1 = 1nF; Iout = 1µA

120

140

dB

Adjustable Gain

G

10

Output Voltage Range

0.2

VCC – 0.2

V

Guaranteed Max Output Current

Sink and source

250

µA

Output Load Resistance

source

and

sink

,

/

OUT

OUT

I

V

=

20

k

Ω

Power Supply Rejection Ratio

PSRR

90

110

dB

Gain Bandwidth Product

GBW

R1,2=1k Rk=10k, C1=1nF,

Ck=100pF, no RL

190

310

kHz

Non Linearity

NL = G/Go, G = 100

10

-4

Slew Rate

SR

Ω

0.2

0.3

V/µs

Input Voltage Noise

Rs = 100

Ω; V

with Rs = Source Impedance

13.5

20

nV/

√Hz

Overvoltage Protection

12

V

Table 1: Specifications