11
IT-VCM Specifications
Conditions unless noted: Volume= -10dB, Bass= 0dB, Treble= 0dB, Balance= Center,
Mode= Stereo Pro 0dBm= 1mW into 600 ohm; 0.775 Vrms
Input Number/Type 1 stereo, balanced or unbalanced
Connector Fixed 5 position screw terminal
Impedance 20k ohms balanced, 10k ohms unbalanced
Maximum Input Level +18dBm (Pro mode), +6dBm (consumer mode) Volume set at -10dB
CMRR >50dB
Input Controls:
Pro/Consumer mode
Pro mode provides unity gain with volume set to 0dB.
Consumer mode provides +12dB boost.
Mono/Stereo Mode
Mono Mode provides L+R input sum fed to both left and
right outputs
Bass
±15dB @ 40Hz in thirty one 1dB steps (with volume = 0dB) controllable from
serial port only
Treble
±15dB @ 16kHz in thirty one 1dB steps (with volume = 0dB) controllable from
serial port only
Balance
Left or Right channel cut by 20dB in thirty one steps controllable from serial port
only
Volume
0 to -62dB in 1dB steps. The 63
r
step provides an attenuation of
≤-63dB controllable from pot, input switches or serial port.
Mute
Attenuates input signal by at least -95dB controllable from input switches or
serial port.
Output Number/Type 1 Stereo balanced or unbalanced
Connector Fixed 5 position screw terminal
Impedance 50 ohm balanced (intended to drive a 600 ohm or higher load)
Maximum output level +13dBm
Frequency response 20Hz-20kHz ±0.5dB
S/N 80dB
THD 0.1% @ 1khz, +2dBm in “Pro” mode
Power +12VDC @ 200mA maximum
Power Supply
Universal input IT-PS1 (12VDC 1A supply available separately and will power
up to five IT-VCM modules)
Connector Fixed 2 position screw terminal
On Board LED indicators Power Input Supervisor, Mute Status, Serial Input Rx/Tx, Serial Output Rx/Tx
Control Inputs
Volume up, Volume down and Mute via contact closure to ground.
3k impedance
Volume Potentiometer
(also see NOTE"*" below)
External 10k linear taper pot 3 wire connection (can also accept a 0-12VDC
external control voltage)
Mute LED Output 3.3VDC output, 330 ohm impedance (direct drive to an external 10 mA LED)
Ramp Output
0-10VDC output, 500 ohm impedance (Intended to drive a high impedance
control system analog input or external bar graph display.)
NOTES:
*Must enable “Pot Control” mode switch to use pot. Volume Up/Down switches and serial control of volume are
disabled when pot is enabled. Serial port can be used to quiry pot level setting. Mute switch is still active when pot
is enabled.
Settings retention: All current settings are saved in non-volatile flash memory upon power loss. Setting include:
Volume, Bass, Treble, Balance, Mute and settings.
(16 pages)
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