Crown Audio IQ P.I.P.-DSP - Manual (Page 23)

Page 23
IQ–P.I.P.–DSP Programmable Input Processor with DSP for IQ Systems
Reference Manual
6 Specifications
General
Internal Controls: An 8-segment DIP switch sets the
IQ address (decimal range: 1–250). Note: If address
“0” is selected, the IQ–P.I.P.–DSP will operate in stand-
alone mode. A Reset switch, accessible with a straight-
ened paper clip through the
P.I.P. panel, resets all
settings (except the amplifier output voltage scale fac-
tors) to the “user defaults” if it is pressed for less than 2
seconds or the factory defaults if it is pressed for more
than 2 seconds. Two jumpers (JP4, JP5) enable or dis-
able the output voltage scaling circuitry.
Connectors: Crown Bus Input: Locking 5-pin female
DIN connector. Crown Bus Output: Locking 4-pin fe-
male DIN connector. Audio Input: Balanced 3-pin fe-
male XLR connector for each channel. Audio “Daisy
Chain” Output: ¼-inch balanced (tip, ring, sleeve)
phone jack. External Power: Mini jack.
Indicators : A yellow DSPI (Data Signal Presence Indi-
cator) flashes when a valid IQ command is received
from the
IQ System via the Crown Bus. The DSPI can
be forced on to facilitate rapid troubleshooting of Crown
Bus wiring.
Nonvolatile Memory Backup: EEPROM capable of
75,000 typical writes.
Power Requirements: Power draw: 320 mA @ +24
VDC and 160 mA @ –24 VDC. When installed into a
Crown
P.I.P.-compatible amplifier, the unit receives
±24 VDC from the amplifier. No further power is re-
quired if the unit is installed in a
Com-Tech (all mod-
els), Macro-Tech 5000VZ or 10000, Reference or any
PIP2-compatible amplifier. The unit may require addi-
tional power in other amplifiers. External power should
be +24 VDC with a minimum of 200 mA (400 mA rec-
ommended for safety margin).
Crown Bus Data Communication
Protection: If communication is lost, the unit will con-
tinue to function with the last commands received.
Data Rate: 38.4 K BAUD.
Data Format: Serial, binary, asynchronous; 1 start bit;
1 stop bit; 8 data bits; no parity.
Crown Bus Interface Type: Optically isolated 20
milliamp serial loop.
Operation: Half duplex.
Intelligence: 8-bit, 8 MHz, 2 MIPS Motorola 6811 mi-
croprocessor.
Transmission Distance: Variable from 200 to 3000
feet (61 to 914 m), depending upon wire capacitance.
Typically 1000 feet (305 M) using shielded twisted-pair
wire, #26 AWG or larger. Can be extended with an IQ
Repeater.
Audio
Please note: The audio specifications are referenced
to 0.775 V (0 dBu). Measurements were made at the
output of the
IQ–P.I.P.–DSP module, itself.
Digital Signal Processor (DSP): 33 MHz, 16.5 MIPS
Motorola DSP56002 microprocessor with 32 K x 24
SRAM for run-time program/data storage and 32 K x 8
EEPROM for nonvolatile program/data memory
backup.
Analog to Digital Conversion (ADC): 18-bit. 64x
oversampled input. 44.1 kHz sample rate output.
Digital to Analog Conversion (DAC): 18-bit. 8x inter-
polated Linear Phase FIR reconstruction filter. 44.1 kHz
sample rate input.
Input Impedance: Nominally 24 K ohms balanced and
12 K ohms unbalanced.
Maximum Input Level: +4 dBu @ 0 dB gain; +16 dBu
@ –12 dB gain.
Signal-to-Noise: >90 dB (A-weighted). >85 dBu from
20 Hz to 20 kHz.
Dynamic Range: >95 dBA (A-weighted).
Frequency Response: ±0.25 dB from 20 Hz to 20 kHz.
Crosstalk: –80 dB (typical). –60 dB (worst case at sig-
nal level and signal frequency extremes).
Common Mode Rejection (CMR): >90 dB (typical).
>70 dB (worst case at signal level and signal frequency
extremes).
Total Harmonic Distortion (THD) + Noise: <0.05%
(typical). <0.1% (worst case at signal level and signal
frequency extremes).
Output Impedance: Nominally 150 ohms (balanced).
Maximum Output Level: +4 dBu.
IQ System Data Acquisition
Input/Output Monitor Accuracy: Typically ±1 dB.