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參數(shù)資料
| 型號(hào)： | MAT02AH/883 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 小信號(hào)晶體管 |
| 英文描述： | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| 封裝： | TO-78, 6 PIN |
| 文件頁(yè)數(shù)： | 3/12頁(yè) |
| 文件大?。?/td> | 264K |
| 代理商： | MAT02AH/883 |
MAT02
–11–
REV. C
Substituting in the voltage relationships and simplifying leads
to:
VO =
RO
R1
VY
V Z
V X
m
, where
(20)
m =
RB + KRA
RB + 1– K
()R
A
The factor “K” is a potentiometer position and varies from zero
to 1.0, so “m” ranges from RB/(RA + RB) to (RB + RA)/RB.
Practical values are 125
for R
B and 500
for R
A; these val-
ues will provide an adjustment range of 0.2 to 5.0. A value of
100 k
is recommended for the R
1 resistors assuming a full-
scale input range of 10 V. As with the one-quadrant multiplier/
divider circuit previously discussed, the VX, VY, and VZ inputs
must all be positive.
The op amps should have the lowest possible input offsets. The
OP07 is recommended for most applications, although such
programmable micropower op amps as the OP22 or OP32 offer
advantages in low-power or single-supply circuits. The micro-
power op amps also have very low input bias-current drift, an
important advantage in log/antilog circuits. External offset null-
ing may be needed, particularly for applications requiring a
wide dynamic range. Frequency compensating capacitors, on
the order of 50 pF, may be required for A2 and A3. Amplifier
A1 is likely to need a larger capacitor, typically 0.0047
F, to as-
sure stability.
Accuracy is limited at the higher input levels by bulk emitter re-
sistance, but this is much lower for the MAT02 than for other
transistor pairs. Accuracy at the lower signal levels primarily de-
pends on the op amp offsets. Accuracies of better than 1% are
readily achievable with this circuit configuration and can be bet-
ter than
±0.1% over a limited operating range.
FAST LOGARITHMIC AMPLIFIER
The circuit of Figure 23 is a modification of a standard logarith-
mic amplifier configuration. Running the MAT02 at 2.5 mA per
side (full-scale) allows a fast response with wide dynamic range.
The circuit has a 7 decade current range, a 5 decade voltage
range, and is capable of 2.5
s settling time to 1% with a 1 V to
10 V step.
The output follows the equation:
VO =
R3 + R2
R2
kT
q
In
V REF
V IN
(21)
The output is inverted with respect to the input, and is nomi-
nally –1 V/decade using the component values indicated.
LOW-NOISE
1000 AMPLIFIER
The MAT02 noise voltage is exceptionally low, only 1 nV/
√Hz
at 10 Hz when operated over a collector-current range of 1 mA
to 4 mA. A single-ended
×1000 amplifier that takes advantage of
this low MAT02 noise level is shown in Figure 24. In addition
to low noise, the amplifier has very low drift and high CMRR.
An OP32 programmable low-power op amp is used for the sec-
ond stage to obtain good speed with minimal power consump-
tion. Small-signal bandwidth is 1 MHz, slew rate is 2.4 V/
s,
and total supply current is approximately 2.8 mA.
Figure 22. Multifunction Converter
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAT-02AH/883 | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT-02AH | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT02BRC/883 | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR |
| MAT02AH/883 | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
| MAT02BIEH | 20 mA, 40 V, 2 CHANNEL, NPN, Si, SMALL SIGNAL TRANSISTOR, TO-78 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAT02BH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT02BH/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT02BIEH | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT02BRC/883C | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MAT02EH | 制造商:Analog Devices 功能描述:AMPLIFIER IC NUMBER OF CIRCUITS:2 |
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