TDC1016 查看數據表（PDF） - Fairchild Semiconductor
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TDC1016 Datasheet PDF : 12 Pages
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TDC1016
Input Coding Table
NDIS
N2C
NFH
NFL
0
x
x
x
1
1
1
1
1
1
1
1
1
1
0
0
1
1
0
0
1
0
1
1
1
0
1
1
1
0
0
0
1
0
0
0
1
x
0
1
1
x
1
0
Notes:
1. For TTL, 0.0 < VIL < +0.8V is Logic 0.
2. For TTL, +2.0 < VIH < +5.0V is Logic 1.
3. For ECL, -1.85 < VIL < -1.67V is Logic 0.
4. For ECL, -1.0 < VIH < -0.8V is Logic 1.
5. x = don’t care.
PRODUCT SPECIFICATION
Data
xxxxxxxxxx
1111111111
0000000000
1111111111
0000000000
0111111111
1000000000
0111111111
1000000000
xxxxxxxxxx
xxxxxxxxxx
Output
0.0
0.0
-1.0
-1.0
0.0
0.0
-1.0
-1.0
0.0
0.0
-1.0
Description
Output Disabled
Binary (Default State for TTL Mode
Control) Inputs Open
Inverse Binary
Two’s Complement
Inverse Two’s Complement
Force HIGH
Force LOW
Applications Discussion
Calibration
The TDC1016 is calibrated by adjusting the voltage refer-
ence to give the desired full-scale output voltage. The current
switches can be turned on either by loading the data register
with full-scale data or by bringing the NFH input to a logic
zero. Note that all 10 current switches are activated by the
NFH input and the resulting full-scale output voltage will be
greater than if the system used only eight or nine bits for
full-scale data.
Typical Application
The Typical Interface Circuit (Figure 5) shows the TDC1016
in a typical application, reconstructing video signals from
digital data. Television timing signals, SYNC and
BLANKING, are added by injecting current from the Wilson
current source into a resistor divider circuit at the output of
the TDC1016.
The TDC1016 output and currents from the SYNC and
BLANKING inputs are summed and amplified by the
HA2539 wide-band operational amplifier. Note the careful
power supply decoupling at the power input pins of the
amplifier. The output of the circuit is a composite video sig-
nal with SYNC and BLANKING levels coming from exter-
nal sources. This technique allows the TDC1016 to use its
entire dynamic range for the video information while pulses
are added by other means.
The reference for the TDC1016 is generated by dividing the
output voltage from a two-terminal band-gap voltage refer-
ence. System gain is calibrated by adjusting variable resistor
R1. Analog and digital grounds should be routed back to sys-
tem power supply ground by separate paths.
8
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