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參數(shù)資料
| 型號： | MAX1101 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single-Chip, 8-Bit CCD Digitizer with Clamp and 6-Bit PGA |
| 中文描述： | 單芯片，8位數(shù)字化儀與防治荒漠化公約鉗位和6位美國PGA |
| 文件頁數(shù)： | 5/12頁 |
| 文件大小： | 110K |
| 代理商： | MAX1101 |
M
S ingle-Chip, 8-Bit CCD Digitizer
with Clamp and 6-Bit PGA
_______________________________________________________________________________________
5
Programmable-Gain Amplifier
The PGA amplifies the differential video signal from the
CCD (at CCDIN). Gain is settable with the 6-bit con-
trol word from -2 to -10 in 64 steps, in increments of
-0.125. The PGA also provides for periodic DC restora-
tion of the capacitively coupled input.
As shown in Figure 2, the switched-capacitor amplifier’s
gain is set by the ratio C
I
/C
F
. The input is sampled on
the C
I
capacitors, which is a set of equal capacitors.
The 6-bit gain control word determines the number
of capacitors used. Thus the PGA gain is set from
-2 to -10.
A voltage equal to V
REF-
is applied to the PGA’s nonin-
verting input. This offsets the PGA output to be within
the range of the ADC (V
REF-
to V
REF+
).
Clamp Circ uit
As shown in Figure 2, the CCD output is connected to
the MAX1101 input (CCDIN) through an external
capacitor, which removes the potentially large DC
common-mode voltages from the input signal.
Whenever CLAMP is high, the CLAMP switch is closed
and C
EXT
is charged to V
REF+
. It can be actuated
either once per pixel (sampling reset level) or less fre-
quently (such as for restoring optical black level once
per line), as required by the application.
VIDSAMP controls the sampling of the video signal
and offset nulling of the PGA. To null out the offset,
VIDSAMP causes switches S1 and S1P to close, plac-
ing the amplifier in a unity-gain configuration, as shown
in Figure 3a. This configuration causes the amplifier’s
offset voltage to be stored on CF. In the next portion of
the cycle, when VIDSAMP returns low, the S1 switches
are opened and S2 is closed (Figure 3b). This is the
standard inverting op-amp configuration. The only dif-
ference is that capacitors are used to set the gain, and
the amplifier’s offset voltage has been stored on these
capacitors and is thus canceled. The amplifier’s output
is [C
F
/C
I
] x V
VIDEO
+ V
REF-
. The CDS function is shown
in Figure 4.
ADC
The ADC uses a recycling half-flash conversion tech-
nique in which a 4-bit flash ADC section achieves an
8-bit result in two steps (Figure 5). Using 15 compara-
tors, the flash ADC compares the unknown input
voltage to the reference ladder (using REF+ and REF-)
and provides the upper four data bits.
An internal digital-to-analog converter (DAC) uses the
four most significant bits (MSBs) to generate the analog
result from the first flash conversion and a residue volt-
age that is the difference between the unknown voltage
Figure 2. PGA Functional Diagram
S1
S2
S1P
C
I
S2
S1
CLAMP
CF
C
EXT
0.047
μ
F
REF-
REF-
REF+
REF+
TO
ADC
FROM
CCD
VIDSAMP
S1
S2
S1P
ON
ON
ON
OFF
OFF
OFF
* INTERNALLY GENERATED SIGNALS
*
*
*
REF-
C
F
C
I
REF+
REF-
V
OUT
= V
REF
- ±V
0S
C
I
C
F
REF-
V
REF
+
- V
VIDEO
(FROM DC
RESTORE)
Figure 3a. PGA Connection with VIDSAMP = Low
Figure 3b. PGA Connection with VIDSAMP = High
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