The SIM980 Summing Amplifier has four input channels that can be added or subtracted from each other.
The output noise is less than 60 nV/√Hz, and crosstalk between channels is less than -80 dB. With a bandwidth of 1 MHz, a slew rate of 40 V/ms, and input offsets that are trimmed to ±100 µV, the SIM980 is extremely useful in many analog applications.
The digital control circuitry in the SIM980 is designed with SRS's special clock-stopping architecture in which the microcontroller is turned on only when switch settings are being changed. This guarantees that no digital noise contaminates low-level analog signals.
Number of inputs 4
Function Inverting, non-inverting or off
Impedance 1 MΩ
Bandwidth DC to 1 MHz
Output noise 60 nV/√Hz @ 1 kHz
Crosstalk -80 dB @ 1 kHz
Offset ±100 µV (after 5 min. warm
Max. input & output ±10 V
Input slew rate 40 V/µs
THD 0.01 % (80 dB) @ 1 kHz
Output slew rate 75 V/µs
Operating temp. 0 °C to 40 °C, non-condensing
Interface Serial via SIM interface
Connectors BNC (5 front-panel, 1 rear-
DB15 (male) SIM interface
Power Power supplied by the SIM900
Mainframe, or optionally by a
user-supplied DC power supply
(±15 V and +5 V)
Dimensions 1.5" × 3.6" × 7.0" (WHL)
Weight 1.5 lbs.
Warranty One year parts and labor on
defects in materials and