Philips TDA8767 - Manual (Page 9)

1999 Feb 16 9
Philips Semiconductors Preliminary specification
12-bit high-speed Analog-to-Digital
Converter (ADC)
TDA8767
Notes to the characteristics
1. The
−
3 dB (or
−
1 dB) analog bandwidth is determined by the 3 dB (or 1 dB) reduction in the reconstructed output,
the input being a full-scale sine wave.
2. THD (total harmonic distortion) is obtained with the addition of the first five harmonics:
F being the fundamental harmonic referenced at 0 dB for a full-scale sine wave input.
3. The analog input settling time is the minimum time required for the input signal to be stabilized after a sharp full-scale
input (square wave signal) in order to sample the signal and obtain correct output data (see Fig.5).
4. Output data acquisition: the output data is available after the maximum delay of t
d
.
S IGNAL - TO - NOISE RATIO
S/N signal-to-noise ratio without harmonics;
f
clk
= 30 MHz; f
i
= 4.43 MHz
−
61
−
dB
Timing (C
L
= 15 pF); note 4; see Fig.3
t
ds
sampling delay time
− −
2 ns
t
h
output hold time 8
− −
ns
t
d
output delay time V
CCO
= 4.75 V
−
12 15 ns
V
CCO
= 3.15 V 15 18 ns
3-state output delay times; see Fig.4
t
dZH
enable HIGH
−
14 18 ns
t
dZL
enable LOW
−
16 20 ns
t
dHZ
disable HIGH
−
16 20 ns
t
dLZ
disable LOW
−
14 18 ns
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
THD 20 log
F
(2nd)
2
(3rd)
2
(4th)
2
(5th)
2
(6th)
2
+ + + +
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