7.5 Electrical Characteristics (continued)

at TA = 25°C, VS = ±15 V, RL = 10 kΩ, connected to ground, VREF = 0 V, VCM = 0 V, and G = 1 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

REFERENCE INPUT

RIN

Input impedance

10

kΩ

Input current

80

µA

Reference input voltage

(V–)

(V+)

V

Gain to output

1

V/V

Reference gain error

VO = ±10 V, inside the voltage swing

range

0.01

0.05

%

POWER SUPPLY

IQ

Quiescent current

(7)

VIN = 0 V

6.2

6.6

mA

TA = –40°C to +125°C

8.9

(1)

Total offset, referred-to-input (RTI): VOS = (VOSI) + (VOSO / G).

(2)

Specified by characterization. Not tested in production.

(3)

Offset drifts are uncorrelated. Input-referred offset drift is calculated using: ΔVOS(RTI) = √[ΔVOSI 2 + (ΔVOSO / G)2].

(4)

Input voltage range of the input stage. The input range depends on the common-mode voltage, differential voltage, gain, and reference

voltage; see Figure 7-12.

(5)

The values specified for G > 1 do not include the effects of the external gain resistor, RG.

(6)

Thermal effects can degrade input stage nonlinearity and thus can scale with gain; See Figure 9-5.

(7)

This parameter is tested in a high speed automatic test environment and does not measure the thermal effects with a longer a time

constant. The thermal effect depends on supply voltage, layout, heat sinking and air flow conditions.

(8)

Total RTI voltage noise is equal to: eN(RTI) = √[eNI 2 + (eNO / G)2].

(9)

Input current noise density specified for unbalanced input impedance. Bias current cancellation improves noise performance for

balanced systems; See Figure 7-25.

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INA849

SBOS945B – NOVEMBER 2020 – REVISED APRIL 2021

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