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AS8510

Datasheet - Electrical Character i s t ics

6.4.1 Differential Input Amplifier for Current Channel

Notes:

1. Leakage test accuracy is limited by tester resource accuracy and tester hardware.

2. For gain 100 PGA input common mode is 0V and the minimum supply is 3.15V.

3. The measurement ranges are referred only by the gain of input amplifier, while other parameters such as bandwidth etc. are pro-

grammed independently.

4. This parameter is not measured directly in production. It is measured indirectly via gain measurements of the whole path. It is guaran-

teed by design.

5. Pole frequency of input amplifier changes with GAIN. The number is valid for the gain at G1, while the bandwidth will be higher for other

ranges. This parameter is not measured in production.

6. Based on device evaluation. Not tested.

7. These offsets are cancelled if chopping enabled (default).

8. Noise density calculated by taking system bandwidth as 150Hz.

9. Refer to Measurement Ranges shown in Table 13.

10. No impact on the measurement path. If the chopping is enabled, both the offset and offset drift will be eliminated.

11. For negative input voltages up to -160mV below ground, Input leakage is typically -20nA @ 65ºC due to forward conductance of

protection diode.

Table 15. Differential Input Amplifier for Current Channel

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Input voltage range

RSHH and RSHL

-160

+160

mV

Input current

1, 11

RSHH and RSHL@ +160mV input

voltage at 125ºC with PGA

-50

2

50

nA

ICM

Absolute input voltage range

2

-160

+300

mV

G = G1

Gain1

3, 4, 9

I10

100

G = G2

Gain2

3, 4, 9

I200

40

G = G3

Gain3

3, 4, 9

I400

25

G = G4

Gain4

3, 4, 9

I1500

5

e

Gain deviation

i = 1, 2, 3, 4

0.9 * Gi

1.1 * Gi

Pole frequency

4, 5

15

kHz

εT1

Gain drift with temperature

6

-20ºC to +65ºC

Gain 5, 25, referenced to room

temperature

±0.3

%

Offset drift with temperature

7, 10

350

µV

Input referred offset

7, 10

After trim,

for temperature range -20 to +65ºC

350

µV

Chopping enabled

0

LSB

Noise density

4, 8

25

nV/

√Hz

THD

Total harmonic distortion

For 150 Hz input signal

70

dB