AS8515 datasheet(37/65 Pages) AMSCO

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AS8515

Datasheet - AS8515 Bottom Die Overvi ew

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 30.

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 32. Differential Input Amplifier for Current Channel

Symbol

Parameter

Conditions

Min

Typ

Max

Units

VIN_AMP

Input voltage range

RSHH and RSHL

-160

+160

IIN_AMP

Input current

1, 11

RSHH and RSHL@ +160mV input

voltage at 125ºC with PGA

-50

ICM

Absolute input voltage range

-160

+300

G = G1

Gain1

3, 4, 9

I10

100

G = G2

Gain2

3, 4, 9

I200

G = G3

Gain3

3, 4, 9

I400

G = G4

Gain4

3, 4, 9

I1500

Gain deviation

i = 1, 2, 3, 4

0.9 * Gi

1.1 * Gi

fP_AMP

Pole frequency

4, 5

kHz

εT1

Gain drift with temperature

-20ºC to +65ºC

Gain 5, 25, referenced to room

temperature

±0.5

VOSDRIFT

Offset drift with temperature

7, 10

350

µV

Vos

Input referred offset

7, 10

After trim at -20deg

350

µV

Vos_ch

Chopping enabled

LSB

VNdin

Noise density

4, 8

nV/

√Hz

THD

Total harmonic distortion

For 150 Hz input signal

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