Download MADA-2 Manual - Forssell Technologies

F(t) Forssell Technologies Inc
MADA-2
2 Channel Analog to Digital and Digital to Analog Converter
User Manual
72311
General Description:
The Forssell Technologies MADA-2 is an extremely high quality two channel Analog to Digital
Converter (ADC) and two channel Digital to Analog Converter (DAC) housed in a 1U rack mount
enclosure. The MADA-2 can be powered from 115 or 230 volt 50/60 Hz line voltages. An internally
mounted switch selects which line voltage can be used.
The MADA-2 has AES3 and SPDIF digital inputs and outputs, as well as a Word Clock input and
output. Analog inputs and outputs are balanced and floating so that they can used with either balanced
or unbalanced signals. Using the MADA-2 with unbalanced analog signal sources will result is slightly
worst distortion figures when compared with a balanced analog signal source. No such compromise in
performance exists for the analog outputs.
Analog to Digital (ADC) Section Description:
The ADC section of MADA-2 is a high quality two channel Analog to Digital Converter. The MADA2 is designed for the most demanding applications, where capturing musical performances with accuracy
and honesty is required. Output sample rates from 44.1k to 192k Fs are selected with a single front
panel switch and with LED indicators showing the selected sample rate. Digital “clipping” is indicated
with a single front panel LED that latches on until the “reset” switch is pressed. The MADA-2 analog
circuitry features an all Class A discrete JFET with no IC opamps used in the signal path. The analog
inputs use high quality XLR connectors. The digital outputs provided are AES3 (XLR), SPDIF (RCA),
WC Sync input and Word Clock output (BNC) are provided. An additional Word Clock output is
available as an option. The MADA-2 digital output word length is fixed at 24 bits.
The MADA-2 uses a 32 bit asynchronous decimation filter to provide various standard output sample
rates from 44.1K to 192k. The actual low jitter sampling clock that controls the AD converter chip
timing is permanently set to sample at 196.3 kFs regardless of output sampling rate selection. This
process is called Asynchronous Sample Rate Conversion (ASRC) and is performed by a 32 bit sample
rate converter. The output from the ASRC circuitry is 24 bit at the selected output sample rate.
Please note that there are no provisions for word length reduction, or level metering with this
converter.
Word Clock Output:
The MADA-2 has a single low jitter word clock output available on a rear panel mounted BNC
connector. This output is designed to operate into a 75 ohm terminated coaxial cable. The output
voltage is TTL compatible. The WC output follows the output sample rate, as selected by the front
panel control. Additional WC outputs are provided on the MADA board, but the user would have to
install their own connectors and wire them to the MADA board.
Output Sample Rate selection:
The output sample rate of the MADA-2 is selected by the single front panel mounted “Select” switch.
The LEDs to the right of this switch indicate the output sample rate currently selected. The MADA-2
does not remember this setting when power is removed. If your sample rate is other than 44.1k, then
you must reset the output sample rate to the desired sample rate each time the unit is powered up.
“Over” LED:
The front panel mounted red “Over” LED lights when any channel reaches a digital signal level that is
within 0.1 dB of digital full scale for more than two sample periods. Once lighted, the over LED will
remain lighted until the “reset” switch is press. The reset switch only effects the “Over” LED and does
not reset the converter digital circuitry nor does it change the sample rate back to power up defaults.
Each time you power up the MADA-2, the “Over” LED will light up. Press the reset switch to turn-off
the Over LED.
External Sync Input:
Your MADA-2 is supplied with an External Word Clock Sync function External Sync is selected by
pressing the “Select” switch until the WC external sync LED is lighted. If no valid WC is detected at
the WC Input BNC connector, then the red SYNC LED will be lighted. Once a valid WC is applied to
the BNC connector, the red LED will turn off, indicating that the MADA is locked to the external WC.
The MADA-2 should lock within one second of receiving a valid WC sync input signal. A wide range of
WC input frequencies can be used, including vari-speed WC signals.
The WC sync input level should be TTL compatible and needs to be terminated with a 75 ohm resistor.
The MADA-2 WC input is a high impedance input. This allows several units to be feed sync input with
from one single WC source. To daisy-chain several units, you will need to use BNC Tee connectors on
each unit. A 75 ohm terminator should be connected at the Tee connector of the very end of the chain.
Analog Inputs:
Analog inputs are provided on rear panel mounted XLR connectors. The MADA-2 can accept either
balanced or unbalanced input signals. Unbalanced signals result in a 6 dB lower headroom. The XLR
connectors are wired for pin #2 = + input, and pin #3 = - input signal polarities. The input impedance of
analog inputs is approximately 3k ohm balanced.
Level Calibration:
Unless otherwise requested when your unit was ordered, the MADA-2 is calibrated so that a 0 (775
mv) dBu analog input level produces –18 dBFs digital output level. There are four sets of jumpers
located on the MADA board inside the MADA-2 that will allow you to change the level calibration for
the AD section. All four jumpers must be set for the same level calibration.
Digital Outputs:
There are two digital outputs available with the MADA-2. One is an AES/EBU (AES3) 110 ohm digital
output on a rear mounted XLR connector. The other is a 75 ohm SPDIF digital output on a rear mounted
RCA connector. These digital outputs are isolated from each other and they may be used
simultaneously.
Digital to Analog (DAC) Section Description:
The DAC section MADA-2 is designed for the most demanding applications, where capturing musical
performances with accuracy and honesty is required. The MADA-2 accepts digital inputs with sample
rates from 44.1k to 192k Fs. The MADA-2 has AES3 (AES/EBU) 110 ohm on an XLR connector and
SPDIF 75 ohm RCA inputs. Input selection is via a front panel push button switch with LED
indicators showing which input is selected. Other front panel LED indicators show input fault
condition and SCR lock status.
Level Calibration:
Unless otherwise requested when your unit was ordered, the MADA-2 is calibrated so that a -18 dBFS
digital input level produces a 0 dBu (775 mV) analog output level. There are two trim pots located on
the MDAC board inside the MADA-2 that will allow you to change the level calibration for the DA
section.
Digital inputs
There are two digital inputs on the MADA-2. One is configured as an AES-3 or AES/EBU input, and
the other is an SPDIF input. The AES-3 input is a 110 ohm, transformer isolated, and balanced XLR
input. Pin #1 of this input is connected to chassis ground through a 0.1 mfd capacitor . The SPDIF
input is a 75 ohm single-ended RCA input.
Analog Outputs
The analog output of the MADA-2 are balanced and floating with an output impedance of less than 5
ohms. Either balanced or single-ended loads may be connected to the output of the MADA-2 without
problem. When a single-ended load (unbalanced) is used, be sure to take the signal between pin #2 (hot)
and pin #3 (cold) of the input XLR. Pin #1 can be connected to either of these pins if desired.
Connecting pin #1 to pin #2 will produce an output signal that is out of phase, so normally pin #1 is
connected to pin #3 for single-ended loads. Pin #1 can be left floating too.
MADA-2 Specifications:
ADC specifications:
Sample Rates available : 44.1k, 48k, 88.2k, 96k, 176.4k and 192k
Level Calibration : 0 dBu Input = -18 dBFs
(Other calibration levels available on request.)
Analog Input Impedance = greater than 10k ohm balanced
Maximum analog input level is a function level calibration (no analog clipping).
AES3 (XLR) digital output impedance = 110 ohm balanced floating
SPDIF (RCA) digital output impedance = 75 ohm balanced floating
WC output = +5V (TTL) unterminated. Requires 75 ohm load termination at load.
ADC Latency (Input to Output group delay):
Fs
44.1k
48k
88.2k
96k
176k
192k
Time
1.6 ms
1.48 ms
967 us
895 us
660 us
605 us
DAC Specifications:
Noise <= -120 dBFs A-weighted
Quantization Noise <= -117 dBFs 400 to 22 KHz unweighted
Dynamic Range > = 123 dB
THD+N (%) = 0.0009% @ 1Khz 0 dBu output (-18 dBFs input) 600 ohm load
THD+N (%) = 0.001% @ 1Khz +18 dBu output (0 dBFS input) 600 ohm load
IMD (SMPTE) = 0.001% @ 0 dBu output (-18 dBFs input) 600 ohm load
IMD (SMPTE) = 0.003% @ +18 dBu output (0 dBFs input) 600 ohm load
DAC Latency
Fs
44.1k
48k
88.2k
96k
176k
192k
Time
1.97 ms
1.8 ms
1.13 ms
665 us
712 us
678 us
Analog in to Analog Output Specifications:
Noise Floor = -96 dBu unweighted 22 to 22 KHz
THD+N (%) = 0.001 % with 1Khz 0 dBu input/outout (-18 dBFs)
THD+N (%) = 0.008 %Fs with 1Khz +18 dBu input/output (0 dBFS)
IMD (SMPTE) = 0.002% with 0 dBu input/output (-18 dBFs)
IMD (SMPTE) = 0.05% with +18 dBu input/output (0 dBFs)
General Specifications:
Power consumption = 14 watts @ 120 VAC
AC Line Voltage range = 110 to 125 VAC and 220 to 250 VAC 50 or 60 Hz
AC Line Voltage:
The MADA come preset for either 115 VAC or 230 VAC 50/60 Hz operation as indicted by a rear panel
label. The line voltage is selected by a line voltage switch mounted inside the MADA chassis. Changing
the line voltage from the factory setting requires a change to the AC line fuse which is located within the
AC power entry module on the rear panel. You must use one of the following fuse values…
115 VAC use 250 milliamp TD fuse.
230 VAC use 100 milliamp TD fuse.
Line voltage changes should only be made by a qualified technician.
DAC Measurements
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
28k
30k
32k
Hz
D-A FFT HiRes Stereo.at2c
DA FFT (linear scale) of 2 KHz signal at 0 dBu output level with a 600 load. Red = Ch1 Blue= Ch2
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
D-A FFT HiRes Stereo.at2c
DA FFT (log scale) 2 KHz signal at 0 dBu output level with a 600 load. Red = Ch1 Blue= Ch2
30k
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
28k
30k
32k
20k
30k
Hz
D-A FFT HiRes Stereo.at2c
DA FFT (linear scale) 2 KHz signal at -100 dBu output level. Red = Ch1 Blue= Ch2
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
20
50
100
200
500
1k
2k
5k
10k
Hz
D-A FFT HiRes Stereo.at2c
DA FFT (log scale) of 2 KHz signal at -100 dBu output level with a 600 load. Red = Ch1 Blue= Ch2
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
28k
30k
32k
20k
30k
Hz
D-A FFT HiRes Stereo dual freq.at2c
DA FFT (linear scale) of Dual Freq (19 and 19.5 KHz) signal at 0 dBu Output Level.
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
20
50
100
200
500
1k
2k
5k
Hz
D-A FFT HiRes Stereo dual freq.at2c
DA FFT (log scale) of Dual Freq (19 and 19.5 KHz) signal at 0 dBu Output Level.
10k
+1
+0.8
+0.6
+0.4
+0.2
+0
-0.2
-0.4
-0.6
d
B
r
A
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
-2.2
-2.4
-2.6
-2.8
-3
10
20
50
100
200
500
1k
2k
5k
10k
20k
40k
Hz
D-A FREQ RESP.at2c
DA Frequency Response at 96 KHz sample Rate
+0
-10
-20
-30
-40
-50
-60
d
B
r
-70
A
-90
-80
-100
-110
-120
-130
-140
-150
-160
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
D_A Jitter Spectrum 0.at27
DA Jitter FFT (44.1k Fs) with 1 KHz 0 dBFs sine wave signal and 500 Hz sine wave jitter at 1 UI
(177 ns) amplitude
+3
+15
+2.8
+10
+2.6
+5
+2.4
+0
+2.2
+2
-5
+1.8
-10
+1.6
-15
+1.4
-20
+1.2
-25
+1
-30
+0.8
-35
+0.6
+0.4
-40
d
B
u
+0.2
-45
+0
-50
-0.2
-55
-0.4
-60
-0.6
-65
-0.8
d
B
r
A
-1
-70
-1.2
-75
-1.4
-80
-1.6
-85
-1.8
-90
-2
-95
-2.2
-100
-2.4
-2.6
-105
-2.8
-110
-130
-120
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
-10
+0
dBFS
D-A LINEARITY.at2c
Deviation from Linearity (Right scale) with 0 dBFs to –130 dBFs (Input).
ADC Measurements
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
d
B
F
S
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
-145
-150
-155
-160
1k
2k
3k
4k
5k
6k
7k
8k
9k
10k
11k
12k
13k
14k
15k
Hz
A-D FFT.at2c
AD FFT (linear scale) with 0 dBu 5 KHz input (-18 dBFs digital output).
16k
17k
18k
19k
20k
21k
22k
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
d
B
F
S
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
-145
-150
-155
-160
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
A-D FFT.at2c
AD FFT (log scale) with 0 dBu 5 KHz input (-18 dBFs digital output).
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
d
B
F
S
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
-145
-150
-155
-160
2.5k
5k
7.5k
10k
12.5k
15k
17.5k
20k
22.5k
25k
27.5k
30k
32.5k
35k
Hz
A-D FFT Dual Freq.at2c
AD FFT (linear scale) with dual frequency (19 and 19.5 KHz) 0 dBu signal
37.5k
40k
42.5k
45k
47.5k
-20
-25
-30
-35
-40
-45
-50
-55
-60
-65
-70
-75
-80
d
B
F
S
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
-145
-150
-155
-160
20
50
100
200
500
1k
2k
5k
10k
20k
40k
10k
20k
40k
Hz
A-D FFT Dual Freq.at2c
AD FFT (log scale) with dual frequency (19 and 19.5 KHz) 0 dBu signal
+1
+0.8
+0.6
+0.4
+0.2
+0
-0.2
-0.4
-0.6
d
B
r
1
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
-2.2
-2.4
-2.6
-2.8
-3
20
50
100
200
500
1k
2k
5k
Hz
A-D FREQ RESP.at2c
AD High Frequency Response at 44.1k, 48k, 88.2k, and 96k. (96k is the limit of the test equipment)
+3
+2.8
+2.6
+2.4
+2.2
+2
+1.8
+1.6
+1.4
+1.2
+1
+0.8
+0.6
+0.4
d
B
r
1
+0.2
+0
-0.2
-0.4
-0.6
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
-2.2
-2.4
-2.6
-2.8
-3
10
20
50
100
200
500
1k
Hz
AD Low Frequency Freq Resp
+0
+3
+2.8
-5
+2.6
-10
+2.4
-15
+2.2
-20
+2
-25
+1.8
-30
+1.6
-35
+1.4
-40
+1.2
+1
-45
+0.8
-50
+0.6
-55
d
B
F
S
+0.4
-60
+0.2
-65
+0
-70
-0.2
-0.4
-75
-0.6
-80
-0.8
-85
-1
-90
-1.2
-95
-1.4
-100
-1.6
-105
-1.8
-2
-110
-2.2
-115
-2.4
-120
-2.6
-125
-130
-2.8
-110
-100
-90
-80
-70
-60
-50
-40
-30
-20
dBu
A-D LINEARITY2.at2c
Deviation from Linearity (Right scale) from 0 dBFs to –130 dBFs Output
-10
+0
+10
-3
d
B
F
S
Analog In, Analog Out Measurements
+1
T
+0.8
+0.6
+0.4
+0.2
+0
-0.2
-0.4
-0.6
d
B
r
A
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
-2.2
-2.4
-2.6
-2.8
10
20
50
100
200
500
1k
2k
5k
10k
20k
50k
100k
Hz
Freq Resp Lo.at2c
MADA-2 Freq Resp at 44.1k, 48k, 88.2k, 96k, 176.2k, 196k Sample Rates
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
Hz
Mic Pre FFT.at2c
Analog to Analog FFT (linear scale) 96k Sample Rate 0 dBu Input/Output
24k
26k
28k
30k
32k
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
10
20
50
100
200
500
1k
2k
5k
10k
20k
30k
Hz
Mic Pre FFT.at2c
Analog to Analog FFT (log scale) 96k Sample Rate 0 dBu Input/Output (-18 dBFs)
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
28k
Hz
Mic Pre FFT.at2c
Analog to Analog FFT (linear scale) 96k Sample Rate +18 dBu Input/Output ( 0 dBFs)
30k
32k
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
28k
30k
32k
30k
32k
Hz
Mic Pre FFT.at2c
Analog to Analog FFT (linear scale) 96k Sample Rate -100 dBu Input/Output (-118 dBFs)
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
2k
4k
6k
8k
10k
12k
14k
16k
18k
20k
22k
24k
26k
Hz
A-A FFT Dual Tone.at2c
A-A FFT (linear scale) with dual frequency (19 and 19.5 KHz) 0 dBu output signal
28k
+0
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
-55
-60
d
B
u
-65
-70
-75
-80
-85
-90
-95
-100
-105
-110
-115
-120
-125
-130
-135
-140
10
20
50
100
200
500
1k
2k
5k
10k
20k
30k
Hz
A-A FFT Dual Tone.at2c
A-A FFT (linear scale) with dual frequency (19 and 19.5 KHz) 0 dBu output signal
+1
+0.8
+0.6
+0.4
+0.2
+0
-0.2
-0.4
-0.6
-0.8
d
B
u
-1
-1.2
-1.4
-1.6
-1.8
-2
-2.2
-2.4
-2.6
-2.8
-3
20
50
100
200
500
1k
2k
Hz
Freq Resp Lo.at2c
A-A Frequency Response showing –3 dB response at 96k Fs
5k
10k
20k
60k
+0
-5
-10
-15
-20
-25
-30
-35
-40
d
B
u
-45
-50
-55
-60
-65
-70
-75
-80
-85
-90
20
50
100
200
500
1k
Hz
Freq Resp Lo.at2c
A-A Frequency Response showing full response at 96k Fs
2k
5k
10k
20k
60k
Word Clock Jitter Measurements
Measured at WC output BNC at 96 KHz sample rate
Measurement calibration is…
1 millivolt = 100 picoseconds pk-pk jitter. 100 microvolt= 10 picoseconds pk-pk.
For peak jitter, divide by 2. For RMS multiply by 0.3535
2m
1.9m
1.8m
1.7m
1.6m
1.5m
1.4m
1.3m
1.2m
1.1m
V
1m
.9m
800u
700u
600u
500u
400u
300u
200u
100u
600
700
800
900
1k
2k
3k
4k
5k
6k
7k
8k
9k
10k
20k
Hz
Jitter signal extracted from the WC output of MADC-2 measured with swept bandpass filter.
Blue trace is using internal oscillator, Red is synced to WC input.
Spot Jitter for internal oscillator is 40 ps pk-pk, 20 ps peak, or 14 ps rms maximum.
Spot Jitter of external WC sync is 130 ps pk-pk, 65 ps peak, or 46 ps rms maximum.
1m
.95m
.9m
850u
800u
750u
700u
650u
600u
550u
V
500u
450u
400u
350u
300u
250u
200u
150u
100u
50u
1k
2k
3k
4k
5k
6k
7k
8k
9k
10k
11k
12k
13k
14k
15k
16k
17k
18k
19k
Hz
FFT (linear scale) of extracted jitter signal. Red = internal osc, Blue external sync
20k
3m
2.9m
2.8m
2.7m
2.6m
2.5m
2.4m
2.3m
2.2m
2.1m
2m
1.9m
1.8m
1.7m
1.6m
V
1.5m
1.4m
1.3m
1.2m
1.1m
1m
.9m
800u
700u
600u
500u
400u
300u
200u
100u
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
FFT (log scale) of extracted jitter signal. Red = internal osc, Blue external sync.
Note… due to measurement technique, jitter figures below 1 KHz may not be entirely accurate.