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MC10319 Datasheet(PDF) 9 Page - Motorola, Inc

No. de pieza MC10319
Descripción Electrónicos  High Speed8-Bit Analog-to-Digital Converter
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Fabricante Electrónico  MOTOROLA [Motorola, Inc]
Página de inicio  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

MC10319 Datasheet(HTML) 9 Page - Motorola, Inc

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MC10319
9
MOTOROLA ANALOG IC DEVICE DATA
ICC(A) is nominally 17 mA, and does not vary with clock
frequency or with Vin. It does vary linearly with VCC(A). ICC(D)
is nominally 90 mA, and is independent of clock frequency. It
does vary, however, by 6 to 7 mA as Vin is changed, with the
lowest current occurring when Vin = VRT. It varies linearly
with VCC(D).
VEE is the negative power supply for the comparators,
and is to be within the range – 3.0 to – 6.0 V. Additionally,
VEE must be at least 1.3 V more negative than VRB. IEE is a
nominal – 10 mA, and is independent of clock frequency, Vin,
and VEE.
For proper operation, the supplies must be bypassed at
the IC. A 10
µF tantalum, in parallel with a 0.1 µF ceramic is
recommended for each supply to ground.
DIGITAL SECTION
Clock
The Clock input is TTL compatible with a typical
frequency range of 0 to 30 MHz. There is no duty cycle
limitations, but the minimum low and high times must be
adhered to. See Figure 7 for the input current requirements.
The conversion sequence is shown in Figure 19, and is
as follows:
• On the rising edge, the data output latches are latched
with old data, and the comparator output latches are
released to follow the input signal (Vin).
• During the high time, the comparators track the input
signal. The data output latches retain the old data.
• On the falling edge, the comparator outputs are latched
with the data immediately prior to this edge. The
conversion to digital occurs within the device, and the
data output latches are released to indicate the new data
within 20 ns.
• During the clock low time, the comparator outputs remain
latched, and the data output latches remain transparent.
A summary of the sequence is that data present at Vin
just prior to the Clock falling edge is digitized and
available at the data outputs immediately after that same
falling edge.
The comparator output latches provide the circuit with an
effective sample–and–hold function, eliminating the need for
an external sample–and–hold.
Enable Inputs
The two Enable inputs are TTL compatible, and are used
to change the data outputs (D7–D0) from active to 3–state.
This capability allows cascading two MC10319s into a 9–bit
configuration, flip–flopping two MC10319s into a 50 MHz
configuration, connecting the outputs directly to a data bus,
multiplexing multiple converters, etc. See the Applications
Information section for more details. For the outputs to be
active, Pin 19 must be a Logic “1”, and Pin 20 must be a Logic
“0”. Changing either input will put the outputs into the high
impedance mode. The Enable inputs affect only the state
of the outputs – they do not inhibit a conversion. The input
current into Pins 19 and 20 is shown in Figure 6, and the
input/output timing is shown in Figure 1 and 20. Leaving
either pin open is equivalent to a Logic “1”, although good
design practice dictates that an input should never be
left open.
The Overrange output (Pin 3) is not affected by the Enable
inputs as it does not have 3–state capability.
Outputs
The Data outputs are TTL level outputs with high
impedance capability. Pin 4 is the MSB (D7), and Pin 21 is the
LSB (D0). The eight outputs are active as long as the Enable
inputs are true (Pin 19 = high, Pin 20 = low). The timing of the
outputs relative to the Clock input and the Enable inputs is
shown in Figures 1 and 20. Figures 8 and 9 indicate the
output voltage versus load current, while Figure 3 indicates
the leakage current when in the high impedance mode.
The output code is natural binary, depicted in the
table below.
The Overrange output (Pin 3) goes high when the input,
Vin, is more positive than VRT – 1/2 LSB. This output is
always active – it does not have high impedance capability.
Besides being used to indicate an input overrange, it is
additionally used for cascading two MC10319s to form a
9–bit A/D converter (see Figure 27).
Table 1. Output Code
I
VRT, VRB (V)
Output
O
Input
2.048 V, 0 V
+ 1.0 V, – 1.0 V
+ 1.0 V, 0 V
Output
Code
Overrange
uVRT – 1/2 LSB
u2.044V
u0.9961 V
u0.9980 V
FFH
1
VRT – 1/2 LSB
2.044 V
0.9961 V
0.9980 V
FFH
0
↔ 1
VRT – 1 LSB
2.040 V
0.992 V
0.9961 V
FFH
0
VRT – 1–1/2 LSB
2.036 V
0.988 V
0.9941 V
FEH ↔ FFH
0
Midpoint
1.024 V
0.000 V
0.5000 V
80H
0
VRB + 1/2 LSB
4.0 mV
– 0.9961 V
1.95 mV
00H ↔ 01H
0
tVRB
t0 V
t– 1.0 V
t0 V
00H
0


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