ENABLE/VOS CALIBRATION
參數(shù)資料
型號(hào)： MCP6N11T-005E/MNY
廠商： Microchip Technology
文件頁(yè)數(shù)： 25/50頁(yè)
文件大?。?/td> 0K
描述： IC AMP INSTR RRIO 2.5MHZ 8TDFN
標(biāo)準(zhǔn)包裝： 1
放大器類型： 儀表
電路數(shù)： 1
輸出類型： 滿擺幅
轉(zhuǎn)換速率： 9 V/µs
增益帶寬積： 2.5MHz
電流 - 輸入偏壓： 10pA
電壓 - 輸入偏移： 850µV
電流 - 電源： 800µA
電流 - 輸出 / 通道： 30mA
電壓 - 電源，單路/雙路(±)： 1.8 V ~ 5.5 V
工作溫度： -40°C ~ 125°C
安裝類型： 表面貼裝
封裝/外殼： 8-WFDFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 8-TDFN（2x3）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： MCP6N11T-005E/MNYDKR
2011 Microchip Technology Inc.
DS25073A-page 31
MCP6N11
4.2.2
ENABLE/VOS CALIBRATION
(EN/CAL)
These parts have a Normal mode, a Low Power mode
and a VOS Calibration mode.
When the EN/CAL pin is high and the internal POR
(with delay) indicates that power is good, the part
operates in its Normal mode.
When the EN/CAL pin is low, the part operates in its
Low Power mode. The quiescent current (at VSS) drops
to -2.5 A (typical), the amplifier output is put into a
high-impedance state. Signals at the input pins can
feed through to the output pin.
When the EN/CAL pin goes high and the internal POR
(with delay) indicates that power is good, the amplifier
internally corrects its input offset voltage (VOS) with the
internal common mode voltage at mid-supply (VDD/2)
and the output tri-stated (after tOFF). Once VOS Calibra-
tion is completed, the amplifier is enabled and normal
operation resumes.
The EN/CAL pin does not operate normally when left
floating. Either drive it with a logic output, or tie it high
so that the part is always on.
4.2.3
POR WITH DELAY
The internal POR makes sure that the input offset
voltage (VOS) is calibrated whenever the supply
voltage goes from low voltage (< VPRL) to high voltage
(> VPRH). This prevents corruption of the VOS trim reg-
isters after a low-power event.
After the POR goes high, the internal circuitry adds a
fixed delay (tPLH), before telling the VOS Calibration
circuitry (see Figure 4-2) to start. If the EN/CAL pin is
toggled during this time, the fixed delay is restarted
(takes an additional time tPLH).
4.2.4
PARITY DETECTOR
A parity error detector monitors the memory contents
for any corruption. In the rare event that a parity error is
detected (e.g., corruption from an alpha particle), a
POR event is automatically triggered. This will cause
the input offset voltage to be re-corrected, and the op
amp will not return to normal operation for a period of
time (the POR turn on time, tPLH).
4.2.5
RAIL-TO-RAIL OUTPUT
The Minimum Output Voltage (VOL) and Maximum
Output Voltage (VOH) specs describe the widest output
swing that can be achieved under the specified load
conditions.
The output can also be limited when VIP or VIM exceeds
VIVL or VIVH, or when VDM exceeds VDML or VDMH.
4.3
Applications Tips
4.3.1
MINIMUM STABLE GAIN
There are different options for different Minimum Stable
Gains (1, 2, 5, 10 and 100 V/V; see Table 1-1). The
differential gain (GDM) needs to be greater than or
equal to GMIN in order to maintain stability.
Picking a part with higher GMIN has the advantages of
lower Input Noise Voltage Density (eni), lower Input
Offset Voltage (VOS) and increased Gain Bandwidth
Product (GBWP); see Table 1. The Differential Input
Voltage Range (VDMR) is lower for higher GMIN, but the
output voltage range would limit VDMR anyway, when
GDM ≥ 2.
4.3.2
CAPACITIVE LOADS
Driving large capacitive loads can cause stability
problems for amplifiers. As the load capacitance
increases,
the
feedback
loop’s
phase
margin
decreases, and the closed-loop bandwidth is reduced.
This produces gain peaking in the frequency response,
with overshoot and ringing in the step response. Lower
gains (GDM) exhibit greater sensitivity to capacitive
loads.
When driving large capacitive loads with these
instrumentation amps (e.g., > 100 pF), a small series
resistor at the output (RISO in Figure 4-8) improves the
feedback loop’s phase margin (stability) by making the
output load resistive at higher frequencies. The
bandwidth will be generally lower than the bandwidth
with no capacitive load.
FIGURE 4-8:
Output Resistor, RISO
stabilizes large capacitive loads.
Figure 4-9 gives recommended RISO values for
different capacitive loads and gains. The x-axis is the
normalized load capacitance (CL GMIN/GDM), where
GDM is the circuit’s differential gain (1 + RF /RG) and
GMIN is the minimum stable gain.
RISO
VOUT
CL
V1
VDD
V2
VREF
VFG
RF
RG
U1
MCP6N11
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