6.5 Electrical Characteristics (continued)

at TA = 25°C, VS = 5 V (±2.5 V) to 10 V (±5 V), RL = 2 kΩ connected to VS / 2, VCM = VREFA = VREFGND = VS / 2, II1 = 1 µA,

and II2 = 1 µA (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

LOGARITHMIC AMPLIFIER OUTPUT

VOSO

Output offset voltage

1.3

±7.5

mV

TA = –40°C to +125°C

2.5

±10

mV

PSRR

Power supply rejection

ratio

II1 = II2 = 1 µA

0.1

mV/V

Voltage output swing

(VS–) + 0.3

(VS+) – 0.3

V

Short-circuit current

±20

mA

Capacitive load

100

pF

AUXILIARY OPERATIONAL AMPLIFIER

Offset voltage

±700

µV

TA = –40°C to +125°C

±1

mV

Offset voltage drift

±3

µV/°C

Input bias current

±3

µA

TA = –40°C to +125°C

TBD

Input offset current

±100

nA

TA = –40°C to +125°C

±200

Input common mode

voltage

(VS–) + 1.0

(VS+) – 1.0

V

Input voltage noise

density

f = 0.1 Hz to 10 kHz

57

nVRMS

f = 1 kHz

4

nV/√Hz

Input current noise

f = 1 kHz

1.2

pA/√Hz

AOL

Open-loop voltage gain

(VS–) + 200 mV < VO < (VS+)

– 200 mV, RL = 10 kΩ

126

dB

TA = –40°C to +125°C

120

(VS–) + 200 mV < VO < (VS+)

– 200 mV, RL = 2 kΩ

120

TA = –40°C to +125°C

114

GBW

Gain-bandwidth product

42

MHz

SR

Slew rate

2-V step, G = +1

22

V/μs

tS

Settling time

To 0.1%, 2-V step, G = +1

120

ns

To 0.01%, 2-V step, G = +1

140

CIN

Input capacitance

Differential

1.9

pF

Common-mode

0.7

ZO

Open-loop output

impedance

f = 1 MHz

6.3

Ω

NOISE

Voltage noise (3)

f = 1 kHz, II2 = IREF

II1 = 1 nA

2000

nV/√Hz

II1 = 10 nA

600

II1 = 100 nA

200

II1 = 1 µA

120

FREQUENCY RESPONSE

BW

–3-dB bandwidth (4)

I1 input

II2 = IREF, II1 = 100 pA

TBD

kHz

II2 = IREF, II1 = 1 nA

0.12

MHz

II2 = IREF, II1 = 10 nA

0.4

II2 = IREF, II1 = 100 nA

1.8

II2 = IREF, II1 = 1 µA to 10 mA

6

I2 input

II1 = IREF, II2 = 100 pA

TBD

kHz

II1 = IREF, II2 = 1 nA

TBD

MHz

II1 = IREF, II2 = 10 nA

TBD

II1 = IREF, II2 = 100 nA

TBD

II1 = IREF, II2 = 1 µA to 10 mA

TBD

LOG200

SBOSA28 – AUGUST 2023

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