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TDA8765 Datasheet(PDF) 10 Page - NXP Semiconductors

No. de pieza TDA8765
Descripción Electrónicos  10-bit high-speed Analog-to-Digital Converter ADC
Download  20 Pages
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Fabricante Electrónico  PHILIPS [NXP Semiconductors]
Página de inicio  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA8765 Datasheet(HTML) 10 Page - NXP Semiconductors

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1999 Jan 06
10
Philips Semiconductors
Preliminary specification
10-bit high-speed Analog-to-Digital
Converter (ADC)
TDA8765
Notes
1. The circuit has two clock inputs: CLK and CLK. There are four modes of operation:
a) PECL mode 1 (DC level varies equal to DC level of VCCD): CLK and CLK inputs are at differential PECL levels.
b) PECL mode 2 (DC level varies equal to DC level of VCCD): CLK input is at PECL level and sampling is taken on
the falling edge of the clock input signal. A DC level of 3.65 V has to be applied on CLK decoupled to GND via a
100 nF capacitor.
c) PECL mode 3 (DC level varies equal to DC level of VCCD): CLK input is at PECL level and sampling is taken on
the rising edge of the clock input signal. A DC level of 3.65 V has to be applied on CLK decoupled to GND via a
100 nF capacitor.
d) AC driving mode 4: when driving the CLK input directly and with any AC signal of minimum 0.5 V (p-p) and with
a DC level of 2.5 V, the sampling takes place at the falling edge of the clock signal.
When driving the CLK input with the same signal, sampling takes place at the rising edge of the clock signal. It is
recommended to decouple the CLK or CLK input to DGND via a 100 nF capacitor.
2. It is possible with an external reference connected to pin Vref to adjust the ADC input range. This voltage has to be
referenced to VCCA. For VCCA − 1.825 V, the differential input voltage amplitude is 2 V (p-p).
3. The
−3 dB analog bandwidth is determined by the 3 dB reduction in the reconstructed output, the input being a
full-scale sine wave.
4. THD (total harmonic distortion) is obtained with the addition of the first five harmonics:
where F is the fundamental harmonic referenced at 0 dB for a full-scale sine wave input.
5. 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 SNR:
SNR = Nbit × 6.02 + 1.76 dB.
6. Intermodulation measured relative to either tone with analog input frequencies of 4.43 and 4.53 MHz. The two input
signals have the same amplitude and the total amplitude of both signals provides full-scale to the converter (
−6dB
below full scale for each input signal).
d3 is the ratio of the RMS-value of either input tone to the RMS-value of the worst case third order intermodulation
product.
7. Output data acquisition: the output data is available after the maximum delay of td.
Timing (CL = 10 pF); see Fig.5 and note 7
td(s)
sampling delay time
−−
2ns
th
output hold time
4
−−
ns
td
output delay time
VCCO = 5.25 V
10
15
ns
VCCO = 3.0 V
13
18
ns
3-state output delay times; see Fig.6
tdZH
enable HIGH
14
18
ns
tdZL
enable LOW
16
20
ns
tdHZ
disable HIGH
16
20
ns
tdLZ
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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