140dB Range (1nA to 10mA)
SGM834A
Logarithmic Current-to-Voltage Converter
TYPICAL PERFORMANCE CHARACTERISTICS
TJ = +25℃ and VP = 5V, unless otherwise noted.
VLOG vs. IPD
Logarithmic Conformance (Linearity) for VLOG
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
2.0
1.5
TAJ == --4400℃℃
TAJ == ++2255℃℃
TAJ == 0+℃25℃
TAJ == ++7700℃℃
TAJ == ++8855℃℃
TJ = -40℃
TJ = +25℃
TJ = 0℃
TJ = +70℃
TJ = +85℃
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0.001 0.01 0.1
1
10
100 1000 10000
0.001 0.01 0.1
1
10
100 1000 10000
IPD (μA)
IPD (μA)
Absolute Deviation from Nominal Specified
Value of VLOG for Several Supply Voltages
VSUM vs. IPD
2.0
1.5
0.505
VP = 4.5V
VP = 5V
TJ = -40℃
TJ = +25℃
TJ = +85℃
0.504
0.503
0.502
0.501
0.500
0.499
0.498
0.497
0.496
0.495
V
P = 5.5V
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
0.001 0.01 0.1
1
10
100 1000 10000
0.001 0.01 0.1
1
10
100 1000 10000
IPD (μA)
IPD (μA)
Small Signal AC Response, IPD to VLOG
(5% Sine Modulation of IPD at Frequency)
VPDB vs. IPD
4.0
10
0
TJ = -40℃
TJ = +25℃
TJ = +85℃
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-10
-20
-30
-40
-50
-60
-70
1nA
10nA
100nA
1μA
10μA
100μA
1mA
10mA
0
1
2
3
4
5
6
7
8
9
10
0.1
1
10
100
1000 10000 100000
Frequency (kHz)
IPD (A)
SG Micro Corp
www.sg-micro.com
FEBRUARY 2022
6
SGMICRO [ Shengbang Microelectronics Co, Ltd ]
