9
Specifications ......
Notes: 1. Dynamic characteristics are specified at 5V unless otherwise specified.
2. All logic inputs except, Encoder and Decoder Data Clocks.
3. For an Encoder/Decoder combination, Insertion Loss contributed by a single component is half this
figure.
4. Driven with a source impedance of <100Ω.
5. Recommended values – See Figures 5, 6, 7 and 8.
6 Group Delay Distortion for the full codec is relative to the delay with 820Hz, -20dB at the encoder input.
7. An Emitter Follower output stage.
8. 4V = 80% VDD, 3.5V = 70% VDD, 1.5V = 30% VDD, 1V = 20% VDD.
9. Analogue Voltage Levels used in this Data Sheet: 0dBm0 = 489mVrms = - 4dBm = 0dB.
- 20dBm0 = 49mVrms = - 24dBm.
(e) Inputs and outputs should be screened wherever
possible.
(f) A "ground plane" connected to VSS will assist in
eliminating external pick-up on the input and output
pins.
(g) It is recommended that the power supply rails
have less than 1mVrms of noise allowed.
(h) The source impedance to the Encoder Input pin
must be less than 100Ω, Output Idle channel noise
levels will improve with even lower source impedances.
(a) Care should be taken on the design and layout of
the printed circuit board.
(b) All external components (as recommended in
Figure 3) should be kept close to the package.
(c) Tracks should be kept short, particularly the
Encoder Input capacitor and the VBIAS capacitor.
(d) Xtal/clock tracks should be kept well away from
analogue inputs and outputs.
Application Recommendations
Due to the very low levels of signal and idle channel noise specified in the Eurocom Basic Parameters Specification
D1 – IA8 – a noisy or badly regulated power supply could cause instability putting the overall system performance
out of specification. Adherence to the points noted below will assist in minimizing this problem.
Process Information
The following Table gives details of the process and test controls employed in the manufacture of the FX619
Eurocom Delta Codec in J and M1 packages only. L1 and L2 products are supplied without the process and test
controls detailed below.
Function Reference Remarks
Hermeticity
Fine Leak Test – Mil Std 883C using Method 1014 – test condition A1.
Coarse Leak Test – Mil Std 883C using Method 1014 – test condition C.
Burnin Mil Std 883C using Method 1015 – test condition E.
168 Hours @ 85°C with 5v power, and clocks applied.
Temperature Cycling Mil Std 883C using Method 1010 – test condition B.
10 cycles -55°C to +125°C.
The following mechanical assembly tests are Qualified to BS9450
Vibration BS9450 Section 1.2.6.8.1
55Hz to 500Hz at 98 m/sec acceleration.
Shock BS9450 Section 1.2.6.6
981 m/sec for 6 msec.
Low Pressure BS9450 Section 1.2.6.12
Transport and Storage – 225mmHg (altitude 9000m).
Operation – 600mmHg (altitude 2400m).
Humidity BS9450 Section 1.2.6.4
96 Hours @ 45°C, 95% relative humidity plus condensed
water.