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參數(shù)資料
| 型號(hào)： | TDC1046 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 6-Bit, 25 Msps Monolithic Video A/D Converter(6位,25Msps 單片視頻A/D轉(zhuǎn)換器) |
| 中文描述： | 6位，25 Msps的單片視頻A / D轉(zhuǎn)換器（6位，25Msps時(shí)單片視頻的A / D轉(zhuǎn)換器） |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 73K |
| 代理商： | TDC1046 |
PRODUCT SPECIFICATION
TDC1046
7
Equivalent Circuits
Figure 2. Simplified Analog Input Equivalent Circuit
Figure 3. Digital Input Equivalent Circuit
Figure 4. Output Circuits
V
IN
V
EE
V
IN
C
IN
C
IN
IS A NONLINEAR JUNCTION CAPACITANCE
V
RB
IS A VOLTAGE EQUAL TO THE VOLTAGE ON PIN R
B
V
EEA
I
CB
R
IN
V
RB
REFERENCE
RESISTOR
CHAIN
1-OF-63
COMPARATORS
V
EE
65-1046-04
V
CC
22K
15K
INPUT
65-1046-05
V
CC
+V
CC
OUTPUT
40pF
1N3062
810
LOAD 1
TEST LOAD FOR DELAY
MEASUREMENTS
TO
OUTPUT
PIN
OUTPUT
EQUIVALENT
CIRCUIT
65-1046-06
Applications Discussion
Calibration
To calibrate the TDC1046, adjust V
RT
and V
RB
to set the 1st
and 63rd thresholds to the desired voltages. In the Block Dia-
gram, note that R
1
is greater than R, ensuring calibration
with a positive voltage on R
T
. Assuming a 0V to -1V desired
range, continuously strobe the converter with -0.0079V on
the analog input, and adjust V
RT
for output toggling between
codes 00 and 01. Then apply -0.9921V and adjust V
RB
for
toggling between codes 62 and 63. Instead of adjusting V
RT
,
R
T
can be connected to analog ground and the 0V end of the
range calibrated with a buffer offset control. R
B
is a conve-
nient point for gain adjust that is not in the analog signal
path. These techniques are employed in Figure 5.
Typical Interface Circuit
The TDC1046 does not require a special input buffer ampli-
fier to drive the analog input because of its low analog input
capacitance. A terminated low-impedance transmission line
(< 100
W
) connected to the V
IN
terminals of the TDC1046 is
sufficient if the input voltage levels match those of the A/D
converter.
However, many driver circuits lack sufficient offset control,
drive current, or gain control. The Typical Interface Circuit
(Figure 5) shows a simple buffer amplifier and voltage
reference circuit that may be used with the TDC1046. U2 is
a wide-band operational amplifier with a gain factor of -2.
A small value resistor, R12, serves to help isolate the input
capacitance of the A/D converter from the amplifier output
and insure frequency stability. The pulse and frequency
response of the buffer amplifier are optimized by variable
capacitor C12.
The reference voltage for the TDC1046 is generated by
amplifier U3 and PNP transistor Q1 which supplies the refer-
ence current. System gain is adjusted by varying R9 which
controls the reference voltage level to the A/D converter.
Input voltage range and input impedance for the circuit are
determined by resistors R1 and R2. Formulas for calculating
values for these input resistors are:
and
where VR is the input voltage range of the circuit, Z
IN
is the
input impedance of the circuit, and the constant 1000 comes
from the value of R3. As shown, the circuit is set up for
1Vp-p 75
W
video input.
R1
Z
IN
2VR
è
1000
---1
–
---------------1
=
R2
Z
IN
1000
R1
+
1000 R1
è
–
=
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