Silicon Laboratories MGM13S Series, Manual, Page: 59 / 125

4.1.18 Operational Amplifier (OPAMP)
Unless otherwise indicated, specified conditions are: Non-inverting input configuration, VDD = 3.3 V, DRIVESTRENGTH = 2, MAIN-
OUTEN = 1, C
LOAD
= 75 pF with OUTSCALE = 0, or C
LOAD
= 37.5 pF with OUTSCALE = 1. Unit gain buffer and 3X-gain connection as
specified in table footnotes
1 2
.
Table 4.35. Operational Amplifier (OPAMP)
Parameter Symbol Test Condition Min Typ Max Unit
Supply voltage (from AVDD) V
OPA
HCMDIS = 0, Rail-to-rail input
range 2 — 3.8 V
HCMDIS = 1 1.62 — 3.8 V
Input voltage V
IN
HCMDIS = 0, Rail-to-rail input
range V
VSS
— V
OPA
V
HCMDIS = 1 V
VSS
— V
OPA
-1.2 V
Input impedance R
IN
100 — — MΩ
Output voltage V
OUT
V
VSS
— V
OPA
V
Load capacitance
3 C
LOAD
OUTSCALE = 0 — — 75 pF
OUTSCALE = 1 — — 37.5 pF
Output impedance R
OUT
DRIVESTRENGTH = 2 or 3, 0.4 V
≤ V
OUT
≤ V
OPA
- 0.4 V, -8 mA <
I
OUT
< 8 mA, Buffer connection,
Full supply range
— 0.25 — Ω
DRIVESTRENGTH = 0 or 1, 0.4 V
≤ V
OUT
≤ V
OPA
- 0.4 V, -400 µA <
I
OUT
< 400 µA, Buffer connection,
Full supply range
— 0.6 — Ω
DRIVESTRENGTH = 2 or 3, 0.1 V
≤ V
OUT
≤ V
OPA
- 0.1 V, -2 mA <
I
OUT
< 2 mA, Buffer connection,
Full supply range
— 0.4 — Ω
DRIVESTRENGTH = 0 or 1, 0.1 V
≤ V
OUT
≤ V
OPA
- 0.1 V, -100 µA <
I
OUT
< 100 µA, Buffer connection,
Full supply range
— 1 — Ω
Internal closed-loop gain G
CL
Buffer connection 0.99 1 1.01 -
3x Gain connection 2.93 2.99 3.05 -
16x Gain connection 15.07 15.7 16.33 -
Active current
4 I
OPA
DRIVESTRENGTH = 3, OUT-
SCALE = 0 — 580 — µA
DRIVESTRENGTH = 2, OUT-
SCALE = 0 — 176 — µA
DRIVESTRENGTH = 1, OUT-
SCALE = 0 — 13 — µA
DRIVESTRENGTH = 0, OUT-
SCALE = 0 — 4.7 — µA
MGM13S Mighty Gecko SiP Module Data Sheet
Electrical Specifications
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