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參數(shù)資料
| 型號： | ISL28146FHZ-T7A |
| 廠商： | Intersil |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OPAMP SGL RRIO 5MHZ SOT23-6 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 1.9 V/µs |
| 增益帶寬積： | 5MHz |
| -3db帶寬： | 13MHz |
| 電流 - 輸入偏壓： | 16nA |
| 電壓 - 輸入偏移： | 30µV |
| 電流 - 電源： | 1mA |
| 電流 - 輸出 / 通道： | 56mA |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-6 |
| 供應(yīng)商設(shè)備封裝： | SOT-23-6 |
| 包裝： | 標(biāo)準(zhǔn)包裝 |
| 其它名稱： | ISL28146FHZ-T7ADKR |
12
FN6321.3
June 23, 2008
up with the IN+ signal, a differential voltage results, and
visible distortion occurs on the input and output signals.
To avoid this issue, keep the input slew rate below
1.9V/s, or use appropriate current limiting resistors.
Large (>2V) differential input voltages can also cause an
increase in disabled ICC.
Using Only One Channel
The ISL28246 is a dual op amp. If the application only
requires one channel, the user must configure the unused
channel to prevent it from oscillating. The unused channel
will oscillate if the input and output pins are floating. This will
result in higher than expected supply currents and possible
noise injection into the channel being used. The proper way
to prevent this oscillation is to short the output to the
negative input and ground the positive input (Figure 37).
Current Limiting
These devices have no internal current-limiting circuitry. If
the output is shorted, it is possible to exceed the Absolute
Maximum Rating for output current or power dissipation,
potentially resulting in the destruction of the device.
Power Dissipation
It is possible to exceed the +125°C maximum junction
temperatures under certain load and power-supply
conditions. It is therefore important to calculate the
maximum junction temperature (TJMAX) for all applications
to determine if power supply voltages, load conditions, or
package type need to be modified to remain in the safe
operating area. These parameters are related using
Equation 1:
where:
PDMAXTOTAL is the sum of the maximum power
dissipation of each amplifier in the package (PDMAX)
PDMAX for each amplifier can be calculated using
Equation 2:
where:
TMAX = Maximum ambient temperature
θ
JA = Thermal resistance of the package
PDMAX = Maximum power dissipation of 1 amplifier
VS = Supply voltage (Magnitude of V+ and V-)
IMAX = Maximum supply current of 1 amplifier
VOUTMAX = Maximum output voltage swing of the
application
RL = Load resistance
ECG/EEG AMPLIFIER APPLICATION CIRCUIT
ECG and EEG amplifiers must extract millivolt low frequency
AC signals from the skin of the patient while rejecting AC
common mode interference and static DC potentials created
at the electrode-to-skin interface. In Figure 38, the EL8171
Instrumentation amplifier (U1) and the ISL28146 (U2) form a
differential input, high impedance high pass patient lead
amplifier. U2, RF1 and CF1 form a low pass active feedback
amplifier. Inserting this amplifier in the feedback loop results
in a high pass frequency response in the forward direction.
The corner frequency is given by Equation 3:
Voltage dividers R1 through R2 and R3 through R4 set the
overall amplifier pass-band gain. Unwanted DC offsets
appearing at the patient leads are cancelled by U2 at U1A’s
inverting input. Resistor divider pair, R3 through R4 define
the maximum input DC level that is cancelled, and is given
by Equation 4:
In the passband range, U1B’s gain is +1 and the total signal
gain is defined by the divider ratios according to Equation 5:
The gain bandwidth product of the differential amplifier U1
determines the frequency response limit. Reference
amplifiers U3A and U3B form a DC feedback loop that
supplies a reference voltage drive to the patient to establish
a common mode DC reference for the differential amplifiers.
The voltage at the VCM sense electrode is maintained at the
reference voltage set by RF1-RF2.
With the values shown in Figure 38, the performance
parameters are:
1. Supply Voltage range = +2.4V to +5.5V
2. Total supply current draw @ +5V = 1.3mA (typ)
3. Common-mode reference voltage (VCM) = V+/2
4. Max DC Input Offset Voltage = VCM ±0.18V to ±0.41V
5. Passband Gain = 425V/V
6. Lower -3dB Frequency = 0.05Hz
FIGURE 37. PREVENTING OSCILLATIONS IN UNUSED
CHANNELS
-
+
T
JMAX
T
MAX
θ
JAxPDMAXTOTAL
()
+
=
(EQ. 1)
PD
MAX
2*V
S
I
SMAX
V
S
(
- V
OUTMAX )
V
OUTMAX
R
L
----------------------------
×
+
×
=
(EQ. 2)
fHPF
3dB
–
1/[2*
π*RF1*CF1
=
(EQ. 3)
V
INDC
V[R
4
+
R
3
R
4
+
()
]
=
(EQ. 4)
V
OUTU1Gain
V
OUT VIN
R
1
R
2
+
() R
2
[] R
3
R
4
+
() R
4
[]
==
(EQ. 5)
ISL28146, ISL28246
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