MLX90277

Dual Programmable Linear Hall Effect Sensor

3901090277

Page 8 of 21

Data Sheet

Rev 004

Nov/06

large adjustable range allows the MLX90277 to be used in an unipolar magnetic system without limiting the

output voltage span. The formula below shows how the AGND and OFFSET parameters combine to set the

V

V

OQ

DD

OFFSET

V

AGND

V

V

V

00

.

5

1023

0

.

5

1023

25

.

14

75

.

0

=













∗

−

+













∗

+

−

=

adjusting the AGND value. The OFFSET parameter is often used to set the application's offset output

transfer characteristic.

150°C. This parameter is not used by the end customer.

10.3 Sensitivity, Rough Gain and Fine Gain

The Sensitivity of the MLX90277's individual sensors is controlled through parameters linked to dedicated

internal amplification stages. The parameter Rough Gain (RG), or pre-amplifier, has 4 bits for adjustment of

two stages. The two MSB affect the Differential Input Differential Output (DIDO) stage. The two LSB effect

the Differential to Single output (DTS) stage. The gain of both the DIDO and DTS are multiplied to get the

total RG. The table below shows typical values of the small signal amplifier gain vs. the parameter RG. The

pre-amplifier is chopper stabilized and the refresh frequency is adapted automatically to the RG setting to

match the chopper gain-bandwidth product.

Rough Gain (MSB LSB)

DIDO

DTS

Gain

00 (00 00)

16

1.0

16

01 (00 01)

16

1.5

24

02 (00 10)

16

2.33

37

03 (00 11)

16

4.0

64

04 (01 00)

39

1.0

39

05 (01 01)

39

1.5

59

06 (01 10)

39

2.33

91

07 (01 11)

39

4.0

156

08 (10 00)

82

1.0

82

09 (10 01)

82

1.5

123

10 (10 10)

82

2.33

191

11 (10 11)

82

4.0

328

12 (11 00)

205

1.0

205

13 (11 01)

205

1.5

308

14 (11 10)

205

2.33

477

15 (11 11)

205

4.0

820

Table 8: MLX90277 Rough Gain Small Signal Amplifier Gain