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JKGEN


 

Now - with DSD!

Low Frequency Digital Audio Signal Generator JKG 384-12

The main advantage of this device is I2S, SPDIF and TOSLINK, 15 signal shapes generation, DSD Modes.
Also with the regular analog signals.

Target application: DAC and other digital and analog audio system research, development, debug and repair.


Main features:

  • Digital coaxial SPDIF output (with galvanic isolation)
  • Digital CMOS-level SPDIF output
  • Digital optical TOSLINK output
  • Digital I2S output:
    • Philips I2S
    • Left Justify
    • Right Justify 24bit
    • Right Justify 16bit
  • 2 Channel Analog outputs
  • 16, 24, 32 bit at I2S output
  • 44.1, 48, 88.2, 96, 176.4, 192 kHz Fs at all digital outputs
  • Additionally - 352.8 and 384kHz at I2S output.
  • 1mHz - 100kHz generated frequency
  • 15 signal shapes
  • Audio Clock:
    • Internal low jitter 512*Fs clock
    • External 512*Fs or 1024*Fs clock
  • Output digital level control: 0..-20dB 1dB step, -20..-90dB 10dB step
  • Channel control:
    • Left and Righ in phase,
    • Left and Righ out of phase (180deg.)
    • Left and Righ orthogonal (90deg.),
    • Left, Right, Mute.
  • 8 user's setups, stored in flash memory.
  • TFT Display and "one knob" encoder control
  • Easy firmware upgrade using USB Disc-On-Key.
  • 6-9VDC input voltage:
    • from mains (wall  adapter)
    • 6V Lead-Acid Battery
    • 7.2V Li-Ion Battery
  • +5VDC, 100mA max at I2S output connector, for auxiliary devices.
  • Less then 3W power consumption.


7 things, making this device better then PC with a sound card:

  1. Not everyone PC's sound card have SPDIF/TOSLINK outputs.
  2. Not everyone PC's sound card have I2S output
  3. Not everyone PC's sound card have external MCLK input
  4. JKG 384-12 is much smaller then desktop PC
  5. JKG 384-12 have less surrounding cables, then desktop or laptop with external sound card
  6. JKG 384-12 can be powered from the battery, allowing "on field operation"
  7. JKG 384-12 can be powered from the battery, avoiding the ground loops



Can be purchased as a complete device,
Assembled Kit or DIY KIT.
(see the shop page)
 

Generated Signals:

PCM Mode:

Signal shapes:

  • SIN Wave
  • SIN Bursts
  • SIN Sweep
  • Triangle
  • Square
  • Saw
  • 2 tone IMD test signals:
  • White Noise
  • Pink Noise
  • Constant Value
  • Digital Zero
  • JTest
  • Impulse Test
  • CrossSample Test
  • Sine Squared Signal


Frequency:

SIN, Triangle, Saw and Square wave can be variable (0.1-99999.9 Hz) frequencies or fixed in two ranges:
Normal Range:
0.1, 1, 5, 10, 20, 50, 100, 200, 500, 1000 Hz,
5, 10, 15, 20, 30, 40, 50, 60, 100 kHz.

Low Frequency Range:
1, 10, 50, 100, 200, 500, 1000 mHz,
2, 5, 10, 50, 100, 150, 200, 300, 400, 500, 600, 1000 Hz.


IMD Test Signals:

  • 60/7000 Hz,  4:1 ampl.
  • 250/8020 Hz, 4:1 ampl
  • 6000/7000 Hz, 1:1 ampl
  • 19000/20000 Hz, 1:1 ampl


DSD Mode:

DSD Bus (L-Data, R-Data, Clock) signal generation in 64x mode.

DSD Over PCM (DoP) protocol generation at I2S bus (LJ or I2S format).

DSD Signal shapes:

  • SIN Wave (441, 1002, 11025, 22050 and 44100 Hz)
  • Triangle
  • Square Wave
  • Digital Zero
  • Constant Value














User Manual






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Technical Parameters:

Parameter

Value

Output Bus Format

  • I2S  (16, 24, 32 bit)
  • Left Justify (16, 24, 32 bit)
  • Right Justify24 (16, 24 bit),
  • Right Justify16 (16 bit)

Serial Digital Outputs

  • SPDIF,
  • SPDIF_CMOS,
  • TOSLINK

Digital Signals Level

SPDIF: 1.2v peak-peak @ 75 Ohm

SPDIF_CMOS:  5V CMOS

I2S/LJ/RJ: 3,3V CMOS

EXT, SCALE: 3.3V CMOS (5V tolerant)

Bus Sample Rate

Fs: 44.1/48/88.2/96/176.4/192/352.8/384 kHz

Internal Clock *)

Internal MCLK frequency: 22.5792/24.576 MHz

Initial Accuracy: ±1.5ppm

Total Stability: ±20ppm

Phase Jitter (12кГц-20МГц) - <0.7ps

Period Jitter @1000 cycles: 2ps p-p, 14ps rms

External clock

512Fs (22.5792/24,576 MHz) or

1024Fs (45,4584/49.152 MHz)

3-5V CMOS

THD (PCM Mode)

Digital outputs:
  • 0.00001% @1000 Hz/0dB
  • 0.00015% @1000 Hz/-40dB
  • 0.003% @1000 Hz/-60dB
  • 10000 Hz/0dB
Analog output: <0.005%
  IMD (PCM Mode)
 Digital outputs: not measurable
 Analog output: 0.002% @60/7000Гц 4:1

Analog signals level

SIN: 1.7 Vrms (TBD)

Triangle, Saw, Square: 4.8V p-p

Output impedance (analog outputs)

500-600 Ohm

Square wave rise time (analog output, PCM Mode)

~5 us

Square wave slope (analog output, PCM Mode)

1.14V/us

Dimension

205 (W) x 140 (D) x 45(H), mm

 Weight  1.2kg (w/o wall adapter)

* - clock manufacturer data.