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MC10319 Datenblatt(PDF) 11 Page - Motorola, Inc

Teilenummer MC10319
Bauteilbeschribung  High Speed8-Bit Analog-to-Digital Converter
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Hersteller  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC10319 Datenblatt(HTML) 11 Page - Motorola, Inc

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MC10319
11
MOTOROLA ANALOG IC DEVICE DATA
VIDEO APPLICATIONS
The MC10319 is suitable for digitizing video signals
directly without signal conditioning, although the standard
1.0 Vpp video signal can be amplified to a 2.0 Vpp signal for
slightly better accuracy. Figure 24 shows the input (top
trace) and reconstructed output of a standard NTSC test
signal, sampled at 25 MSPS, consisting of a sync pulse,
3.58 MHz color burst, a 3.58 MHz signal in a Sin2x
envelope, a pulse, a white level signal, and a black level
signal. Figure 25 shows a Sin2x pulse that has been
digitized and reconstructed at 25 MSPS. The width of the
pulse is
≈450 ns at the base. Figure 26 shows an application
circuit for digitizing video.
9–Bit A/D Converter
Figure 27 shows how two MC10319s can be connected to
form a 9–bit converter. In this configuration, the outputs
(D7 to D0) of the two 8–bit converters are paralleled. The
outputs of one device are active, while the outputs of the
other are in the 3–state mode. The selection is made by the
Overrange output of the lower MC10319, which controls
Enable inputs on the two devices. Additionally, this output
provides the 9th bit.
The reference ladders are connected in series, providing
the 512 steps required for 9 bits. The input voltage range is
determined by VRT of the upper MC10319, and VRB of the
lower device. A minimum of 1.0 volt is required across each
converter. The 500
Ω pot (20 turn cermet) allows for
adjustment of the midpoint since the reference resistors of
the two MC10319s may not be identical in value. Without the
adjustment, a non–equal voltage division would occur,
resulting in a nonlinear conversion. If the references are to be
symmetrical about ground (e.g.,
± 1.0 V), the adjustment can
be eliminated, and the midpoint connected to ground. The
use of latches on the outputs is optional, depending on
the application.
50 MHz, 8–Bit A/D Converter
Figure 28 shows how two MC10319s can be connected
together in a flip–flop arrangement in order to have an
effective conversion speed of 50 MHz. The 74F74 D–type
flip–flop provides a 25 MHz clock to each converter, and at
the same time, controls the Enables so as to alternately
enable and disable the outputs. The Overranges do not have
3–state capability, and so cannot be paralleled. Instead they
are OR’d together. The use of latches is optional, and
depends on the application. Data should be latched, or
written to RAM (in a DMA operation), on the high–to–low
transition of the 50 MHz clock.
Negative Voltage Regulator
In the cases where a negative power supply is not
available (neither the – 3.0 to – 6.0 V, nor a higher negative
voltage from which to derive it), the circuit of Figure 29 can be
used to generate – 5.0 V from the + 5.0 V supply. The PC
board space required is small (
≈ 2.0 in2), and it can be
located physically close to the MC10319. The MC34063A is
a switching regulator, and in Figure 29 is configured in an
inverting mode of operation. The regulator operating
specifications are also given.
Figure 16. Differential Phase and Gain Test
Clock
40
VRB
60
80
100
VRT
2.000 V
1.024 Vpp
to
Analyzer
MC10319
DUT
D0
8
74F374
Latch
8
HDS–1250
12–Bit D/A
285.7 mV
571.4 mV
(40 IRE)
0
20
– 20 IRE
120
1.429 V
(100 IRE)
D3
Video
Signal
(See Below)
Video Input Signal
1. Input waveform: 571.4 mVpp, sine wave @ 3.579545 MHz, dc levels as shown above.
2. MC10319 clock at 14.31818 MHz (4x) asynchronous to input.
3. Differential gain: peak–to–peak output @ each IRE level compared to that at 0 IRE.
4. Differential phase: Phase @ each IRE level compared to that @ 0 IRE.


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