Figure 28. Resolution (INLMAX ≤ 1LSB)" />
參數(shù)資料
型號(hào)： LTC2436-1IGN#TR
廠商： Linear Technology
文件頁(yè)數(shù)： 19/28頁(yè)
文件大?。?/td> 0K
描述： IC CONV A/D 16B 2CH DIFF 16SSOP
標(biāo)準(zhǔn)包裝： 2,500
位數(shù)： 16
采樣率（每秒）： 6.8
數(shù)據(jù)接口： MICROWIRE?，串行，SPI?
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 1mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 16-SSOP（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 16-SSOP
包裝： 帶卷 (TR)
輸入數(shù)目和類(lèi)型： 1 個(gè)差分，雙極
LTC2436-1
26
24361f
APPLICATIO S I FOR ATIO
WU
UU
Figure 28. Resolution (INLMAX ≤ 1LSB)
vs Output Data Rate and Temperature
Figure 29. Offset Error vs Output
Data Rate and Reference Voltage
OUTPUT DATA RATE (READINGS/SEC)
0
102030405060708090 100
OFFSET
ERROR
(LSB)
24361 F29
16
8
0
VREF = 5V
VCC = 5V
REF+ = GND
VINCM = 2.5V
VIN = 0V
FO = EXTERNAL OSCILLATOR
TA = 25°C
VREF = 2.5V
OUTPUT DATA RATE (READINGS/SEC)
0
102030405060708090 100
RESOLUTION
(BITS)
24361 F28
18
16
14
12
10
8
TA = 85°C
VCC = 5V
REF+ = 5V
REF – = GND
VINCM = 2.5V
–2.5V < VIN < 2.5V
FO = EXTERNAL OSCILLATOR
RESOLUTION = LOG2(VREF/INLMAX)
TA = 25°C
highest possible level of accuracy from this converter at
output data rates above 20 readings per second, the user
is advised to maximize the power supply voltage used and
to limit the maximum ambient operating temperature. In
certain circumstances, a reduction of the differential refer-
ence voltage may be beneficial.
Increasing Input Resolution by Reducing Reference
Voltage
The resolution of the LTC2436-1 can be increased by
reducing the reference voltage. It is often necessary to
amplify low level signals to increase the voltage resolution
of ADCs that cannot operate with a low reference voltage.
The LTC2436-1 can be used with reference voltages as low
as 100mV, corresponding to a
±50mVinputrangewithfull
16-bit resolution. Reducing the reference voltage is func-
tionally equivalent to amplifying the input signal, however
no amplifier is required.
The LTC2436-1 has a 76
V LSB when used with a 5V
reference, however the thermal noise of the inputs is
800nVRMS and is independent of reference voltage. Thus
reducing the reference voltage will increase the resolution
at the inputs as long as the LSB voltage is significantly
larger than 800nVRMS. A 325mV reference corresponds to
a 5
V LSB, which is approximately the peak-to-peak value
of the 800nVRMS input thermal noise. At this point, the
output code will be stable to
±1LSB for a fixed input. As the
reference is decreased further, the measured noise will
approach 800nVRMS.
Figure 30 shows two methods of dividing down the
reference voltage to the LTC2436-1. Where absolute accu-
racy is required, a precision divider such as the Vishay
MPM series dividers in a SOT-23 package may be used. A
51:1 divider provides a 98mV reference to the LTC2436-
1 from a 5V source. The resulting
±49mV input range and
1.5
V LSB is suitable for thermocouple and 10mV full-
scale strain gauge measurements.
If high initial accuracy is not critical, a standard 2%
resistor array such as the Panasonic EXB series may be
used. Single package resistor arrays provide better tem-
perature stability than discrete resistors. An array of eight
resistors can be configured as shown to provide a 294mV
reference to the LTC2436-1 from a 5V source. The fully
differential property of the LTC2436-1 reference terminals
allow the reference voltage to be taken from four central
resistors in the network connected in parallel, minimizing
drift in the presence of thermal gradients. This is an ideal
reference for medium accuracy sensors such as silicon
micromachined pressure and force sensors. These de-
vices typically have accuracies on the order of 2% and full-
scale outputs of 50mV to 200mV.
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