5.5 Electrical Characteristics (continued)

at TA = 25°C, VS = 5V (±2.5V) to 10V (±5V), OUTA RL = 10kΩ connected to VS / 2, OUTB RL = 2kΩ connected to VS / 2,

VCM = VREFA = VS / 2, VREFGND = VS–, II1 = 1µA, and II2 = 1µA (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 = 1µA

±0.1

mV/V

CMRR

Common-mode rejection

ratio (2)

(VS–) + 2.3V < VCM < (VS+) – 2.0V, II1 = II2 = 1µA

60

dB

Voltage output swing

(VS–) + 0.3

(VS+) – 0.3

V

Short-circuit current

±20

mA

Capacitive load

100

pF

AUXILIARY OPERATIONAL AMPLIFIER

Offset voltage

46

±700

µV

TA = –40°C to +125°C

0.07

±1

mV

Offset voltage drift

0.53

±3

µV/°C

Input bias current

–0.84

±3

µA

TA = –40°C to +125°C

–1.2

Input offset current

18

±100

nA

TA = –40°C to +125°C

45

±300

Input common mode

voltage

(VS–) + 1.0

(VS+) – 1.0

V

Input voltage noise density

f = 0.1Hz to 10kHz

50

nVRMS

f = 1kHz

4.1

nV/√Hz

Input current noise

f = 1kHz

1.2

pA/√Hz

AOL

Open-loop voltage gain

(VS–) + 200mV < VO <

(VS+) – 200mV, RL = 10kΩ

126

150

dB

TA = –40°C to +125°C

126

(VS–) + 200mV < VO <

(VS+) – 200mV, RL = 2kΩ

124

140

TA = –40°C to +125°C

124

PSRR

Power supply rejection

ratio

–1

µV/V

CMRR

Common-mode rejection

ratio

(VS–) + 1.0 < VCM < (VS+) – 1.0

130

dB

GBW

Gain-bandwidth product

CL = 28pF

60

MHz

Unity-gain bandwidth

42

MHz

SR

Slew rate

2V step, G = 1

22

V/μs

tS

Settling time

To 0.1%, 2V step, G = 1

Rising

110

ns

Falling

400

To 0.01%, 2V step, G = 1

Rising

550

Falling

1100

CIN

Input capacitance

Differential

2.6

pF

Common-mode

0.7

ZO

Open-loop output

impedance

f = 1MHz

7.5

Ω

CURRENT REFERENCE

IIREF

IREF initial current

0.98

1

1.02

µA

IREF initial accuracy

–2

0.3

2

%

Temperature coefficient

35

ppm/

℃

VIREF

IREF compliance voltage

(VS–)

(VS+) – 1.0

V

Output impedance

ΔVIREF / ΔIIREF

3

GΩ

LOG200

SBOSA28A – AUGUST 2023 – REVISED DECEMBER 2024

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