Crown Audio IQ P.I.P.-DSP manual Specifications, General, Crown Bus Data Communication, Audio

IQ–P.I.P.–DSPProgrammable Input Processor with DSP for IQ Systems

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.–DSPmodule, 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.

Reference Manual Page 23