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參數(shù)資料
| 型號(hào)： | MAX3532 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Upstream CATV Driver Amplifier |
| 中文描述： | CATV上行驅(qū)動(dòng)放大器 |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大小： | 84K |
| 代理商： | MAX3532 |
Software Shutdown Mode
Software-shutdown mode is enabled when both D7 and
D6 are low (D7, D6 = 00). This mode minimizes current
consumption while maintaining the programmed gain
state stored in the serial data-interface’s latch. All ana-
log functions are disabled in this mode.
__________Applic ations Information
Output Matc h
The MAX3532’s output circuit is a differential emitter fol-
lower that has a near-zero impedance over the operat-
ing frequency range. In order to match to a single-
ended impedance, a transformer and back-termination
resistors are required. Furthermore, operation from a
single +5V supply requires that the output signal swing
be stepped up to achieve the rated output levels.
These are described in the next two sections.
Transformer
To achieve the rated output levels, a 1:2 (voltage ratio)
transformer is required. This transformer must have
adequate bandwidth to cover the intended application.
Note that most RF transformers specify a bandwidth
with a 50
load on the primary and a matching resis-
tance on the secondary winding. The much lower
(approximately 16
due to the back-termination resis-
tors) impedance of the MAX3532’s output will tend to
shift the low-frequency edge of the bandwidth specifi-
cation down by a factor of three or more due to primary
inductance. Keep this in mind when specifying a trans-
former.
RF transformer cores are inherently nonlinear devices,
which must be operated in their linear region if distor-
tion is a critical consideration. In general, the size of the
transformer core used and the number of turns will gov-
ern the distortion performance of the transformer for a
given output level. Therefore a transformer of adequate
size must be used to minimize its contribution to the
overall distortion budget.
Back-Termination Resistors
The value of the back-termination resistors depends on
two parameters: the ultimate output impedance (as
referred through the output transformer), and the quali-
ty of the output match desired. The output impedance
depends on the value of the termination resistors by the
following formula:
Z
OUT
= 4 x [ 2 x (R
term
+ R
P
)]
where R
term
is the value of one termination resistor and
R
P
is parasitic resistance.
M
Upstream CAT V Driver Amplifier
_______________________________________________________________________________________
7
Table 2. Chip-State Control Bits
TXEN
D5
D4
D3
D2
D1
D0
STATE
1
1
X
0*
X
X
X
X
X
X
X
X
X
X
X
X
High-power transmit
Low-noise transmit; subtract 16dB from V
OUT
X
1
1
—
1
1
X
0
0
—
1
1
X
0
0
—
1
1
X
1
1
—
0
0
X
1
1
—
1
1
X
0
1
—
0
1
X
1
0
—
1
0
All analog circuitry off
V
OUT
= +8dBmV
V
OUT
= +9dBmV
—
V
OUT
= +56dBmV
V
OUT
= +57dBmV
A: t
CSS
B: t
SDAS
C: t
SDAH
D: t
SCKL
A
B
C
D
E
F
E: t
SCKH
F: t
CSH
D7
D6
D5
D4
D3
D2
D1
D0
Figure 2. Serial-Interface Timing Diagram
D7
1
1
0
X
0
1
1
1
1
1
D6
1
0
1
X
0
0
0
—
1
1
*Except state 000XXXXXX, which is software shutdown.
X
X
X
X
X
X
Transmit disabled
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