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参数资料
| 型号： | MAX2034CTM-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | Quad-Channel, Ultra-Low-Noise Amplifier with Digitally Programmable Input Impedance |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封装： | 7 X 7 MM, 0.80 MM HEIGHT, MO-220, TQFN-48 |
| 文件页数： | 8/13页 |
| 文件大小： | 356K |
| 代理商： | MAX2034CTM-T |
M
Digitally Programmable Input Impedance
The MAX2034 features an on-chip digitally programma-
ble input impedance, which makes the part compatible
with a variety of source impedances ranging from 50
to 1k
. The input impedance can be programmed for
50
, 100
, 200
, or 1k
through the digital inputs D2,
D1, and D0. See Table 1 for programming details. In
addition to these fixed values, virtually any other input
impedance can be supported by using an off-chip
external feedback resistor, R
F
. To utilize this feature, set
D2, D1, and D0 to any of the four external resistor-con-
trolled states shown in Table 1. The value of the off-chip
feedback resistor can be determined by using the fol-
lowing relationship:
R
F
= (1 + (A / 2)) x R
S
where R
S
is the source impedance, and A is the gain of
the amplifier (A = 9) defined with a differential output.
Noise Figure
The MAX2034 is designed to provide maximum input
sensitivity with its exceptionally low noise figure. The
input active devices are selected for very low equiva-
lent input noise voltage and current, and they have
been optimized for source impedances from 50
to
1000
. Additionally, the noise contribution of the
matching resistor is effectively divided by 1 + (A / 2).
Using this scheme, typical noise figure of the amplifier
is approximately 2.2dB for R
IN
= R
S
= 200
. Table 2
illustrates the noise figure for other input impedances.
Input Clamp
The MAX2034 includes configurable integrated input-
clamping diodes. The diodes are clamped to ground at
±275mV. The input-clamping diodes can be used to
prevent large transmit signals from overdriving the inputs
of the amplifiers. Overdriving the inputs could possibly
place charge on the input-coupling capacitor, causing
longer transmit overload recovery times. Input signals
are AC-coupled to the single-ended inputs IN1–IN4, but
are clamped with the INC1–INC4 inputs. See the
Typical
Application Circuit
. If external clamping devices are pre-
ferred, simply leave INC1–INC4 unconnected.
Quad-Channel, Ultra-Low-Noise Amplifier with
Digitally Programmable Input Impedance
8
_______________________________________________________________________________________
Functional Diagram
D2/D1/D0
ZF1
PD
IN1
INC1
INB1
OUT1-
OUT1+
ZF2
IN2
INC2
INB2
OUT2-
OUT2+
ZF3
IN3
INC3
INB3
OUT3-
OUT3+
ZF4
IN4
INC4
INB4
OUT4-
OUT4+
MAX2034
Table 2. Noise Figure vs. Source and
Input Impedances
Rs (
)
50
100
200
1000
R
IN
(
)
50
100
200
1000
NF (dB)
4.1
2.9
2.2
1.4
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