The LTC6800 uses an internal capacitor (C
參數(shù)資料
型號: LTC6800HDD
廠商: Linear Technology
文件頁數(shù): 13/14頁
文件大?。?/td> 0K
描述: IC OP AMP INSTR R-R I/O 8-DFN
標準包裝: 121
放大器類型: 儀表
電路數(shù): 1
輸出類型: 滿擺幅
轉(zhuǎn)換速率: 0.2 V/µs
增益帶寬積: 200kHz
電流 - 輸入偏壓: 4nA
電壓 - 輸入偏移: 100µV
電流 - 電源: 1.3mA
電壓 - 電源,單路/雙路(±): 2.7 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
供應商設(shè)備封裝: 8-DFN-EP(3x3)
包裝: 管件
LTC6800
6800fb
block DiagraM
applicaTions inForMaTion
Theory of Operation
The LTC6800 uses an internal capacitor (CS) to sample
a differential input signal riding on a DC common mode
voltage (see the Block Diagram). This capacitor’s charge is
transferred to a second internal hold capacitor (CH) trans-
lating the common mode of the input differential signal to
that of the REF pin. The resulting signal is amplified by a
zero-drift op amp in the noninverting configuration. The
RG pin is the negative input of this op amp and allows
external programmability of the DC gain. Simple filtering
can be realized by using an external capacitor across the
feedback resistor.
Input Voltage Range
The input common mode voltage range of the LTC6800
is rail-to-rail. However, the following equation limits the
size of the differential input voltage:
V≤ (V+IN – V–IN) + VREF ≤ V+ – 1.3
Where V+IN and V–IN are the voltages of the +IN and –IN
pins, respectively, VREF is the voltage at the REF pin and
V+ is the positive supply voltage.
For example, with a 3V single supply and a 0V to 100mV
differential input voltage, VREF must be between 0V and
1.6V.
Settling Time
The sampling rate is 3kHz and the input sampling period
during which CS is charged to the input differential voltage
VIN is approximately 150s. First assume that on each
input sampling period, CS is charged fully to VIN. Since
CS = CH (= 1000pF), a change in the input will settle to
N bits of accuracy at the op amp noninverting input after
N clock cycles or 333s(N). The settling time at the OUT
pin is also affected by the settling of the internal op amp.
Since the gain bandwidth of the internal op amp is typically
200kHz, the settling time is dominated by the switched
capacitor front end for gains below 100 (see the Typical
Performance Characteristics section).
+
CH
OUT
6800 BD
4
V
5
REF
6
RG
8
V+
3
+IN
2
–IN
CS
7
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