參數(shù)資料
型號(hào)： TDA8768BH/5/C3
廠商： NXP SEMICONDUCTORS
元件分類： ADC
英文描述： 1-CH 12-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, PQFP44
封裝： 10 X 10 MM, 1.75 MM HEIGHT, 1.30 MM LEAD LENGTH, PLASTIC, SOT-307-2, QFP-44
文件頁數(shù)： 3/30頁
文件大?。?/td> 547K
代理商： TDA8768BH/5/C3
Philips Semiconductors
TDA8768B
12-bit, 80 Msps Analog-to-Digital Converter (ADC)
Product data
Rev. 02 — 20 January 2004
11 of 30
9397 750 12338
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[5]
Total Harmonic Distortion (THD) is obtained with the addition of the rst ve harmonics:
where F is the fundamental harmonic referenced at 0 dB for a full-scale sine wave input.
[6]
Signal-to-noise ratio (S/N) takes into account all harmonics above ve and noise up to Nyquist frequency.
[7]
Effective number of bits are obtained via a Fast Fourier Transform (FFT). The calculation takes into account all harmonics and noise up
to half of the clock frequency (Nyquist frequency). Conversion to SINAD is given by SINAD = ENOB
× 6.02 + 1.76 dB.
[8]
Intermodulation measured relative to either tone with analog input frequencies of 20 MHz and 20.1 MHz. The two input signals have the
same amplitude and the total amplitude of both signals provides full-scale to the converter (
6 dB below full-scale for each input signal).
d3(IM3) is the ratio of the RMS value of either input tone to the RMS value of the worst case 3rd-order intermodulation product.
[9]
Output data acquisition: the output data is available after the maximum delay of td; see Figure 3.
[1]
Twos complement reference is inverted MSB.
[1]
X = don’t care.
THD
20 log
2nd
()
2
3rd
()
2
4th
()
2
5th
()
2
6th
()
2
++
+
F
2
--------------------------------------------------------------------------------------------------------------------------------------
=
Table 7:
Output coding with differential inputs (typical values to AGND);
Vi(p-p) Vi(p-p) = 1.9 V, Vref =VCCA3 1.75 V
Code
Vi(p-p)
IR
Binary outputs
Twos complement
D11 to D0
Underow
<3.125
>4.075
0
0 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0
0
3.125
4.075
1
0 0 0 0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 0 0 0 0 0 0
1
1
0 0 0 0 0 0 0 0 0 0 0 1
1 0 0 0 0 0 0 0 0 0 0 1
↓
↓
2047
3.6
1
0 1 1 1 1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1 1 1 1 1
↓
↓
4094
1
1 1 1 1 1 1 1 1 1 1 1 0
0 1 1 1 1 1 1 1 1 1 1 0
4095
4.075
3.125
1
1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1
Overow
>4.075
<3.125
0
1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1
Table 8:
Mode selection
OTC
CE
D0 to D11
IR
0
binary
active
1
0
twos complement
active
1
high-impedance
inactive
Table 9:
Sample-and-hold selection
SH
Sample-and-hold
1
active
0
inactive; tracking mode
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