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參數(shù)資料
| 型號： | LTC2361CTS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 8/20頁 |
| 文件大小： | 0K |
| 描述： | IC ADC 12BIT 250KSPS TSOT23-8 |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 250k |
| 數(shù)據(jù)接口： | MICROWIRE?，串行，SPI? |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 功率耗散（最大）： | 5.4mW |
| 電壓電源： | 單電源 |
| 工作溫度： | 0°C ~ 70°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | SOT-23-8 薄型，TSOT-23-8 |
| 供應(yīng)商設(shè)備封裝： | TSOT-23-8 |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 1 個單端，單極 |
| 配用： | DC1190A-D-ND - BOARD SAR ADC LTC2361 |
LTC2360/LTC2361/LTC2362
16
236012fa
SINGLE-ENDED ANALOG INPUT
Driving the Analog Input
The analog input of the LTC2360/LTC2361/LTC2362 is
easy to drive. The input draws only one small current
spike while charging the sample-and-hold capacitor with
the ADC going into track mode. During the conversion,
the analog input draws only a small leakage current. If
the source impedance of the driving circuit is low, then
the input of the LTC2360/LTC2361/LTC2362 can be driven
directly. As source impedance increases, so will acquisi-
tion time. For minimum acquisition time with high source
impedance, a buffer amplier should be used. The main
requirement is that the amplier driving the analog input
must settle after the small current spike before the next
conversion starts (settling time must be less than tACQ
for full throughput rate). While choosing an input ampli-
er, also keep in mind the amount of noise and harmonic
distortion the amplier contributes.
Choosing an Input Amplier
Choosing an input amplier is easy if a few requirements
are taken into consideration. First, to limit the magnitude
of the voltage spike seen by the amplier from charging
the sampling capacitor, choose an amplier that has a low
output impedance (<100
Ω) at the closed-loop bandwidth
frequency. For example, if an amplier is used in a gain
of 1 and has a unity-gain bandwidth of 10MHz, then the
output impedance at 10MHz must be less than 100
Ω. The
second requirement is that the closed-loop bandwidth must
be greater than 8MHz to ensure adequate small-signal
settling for full throughput rate. If slower op amps are
used, more time for settling can be provided by increasing
the time between conversions. The best choice for an op
amp to drive the LTC2360/LTC2361/LTC2362 will depend
on the application. Generally, applications fall into two
categories: AC applications where dynamic specications
are most critical and time domain applications where DC
accuracy and settling time are most critical. The follow-
ing list is a summary of the op amps that are suitable for
driving the LTC2360/LTC2361/LTC2362. (More detailed
information is available on the Linear Technology website at
www.linear.com.)
LTC1566-1: Low Noise 2.3MHz Continuous Time Low-
pass Filter.
LT
1630: Dual 30MHz Rail-to-Rail Voltage FB Amplier.
2.7V to ±15V supplies. Very high AVOL, 500μV offset and
520ns settling to 0.5LSB for a 4V swing. THD and noise
are –93dB to 40kHz and below 1LSB to 320kHz (AV =
1, 2VP-P into 1k, VS = 5V), making the part excellent for
AC applications (to 1/3 Nyquist) where rail-to-rail perfor-
mance is desired. Quad version is available as LT1631.
LTC6241: Dual 18MHz, Low Noise, Rail-to-Rail, CMOS
Voltage FB Amplier. 2.8V to 6V supplies. Very high AVOL
and 125μV offset. It is suitable for applications with a single
5V supply. Quad version is available as LTC6242.
LT1797: Unity-Gain Stable 10MHz, Rail-to-Rail Voltage
Feedback Amplier.
LT1801: 180MHz GBWP, –75dBc at 500kHz, 2mA/Ampli-
er, 8.5nV/√Hz.
LT6203: 100MHz GBWP, –80dBc Distortion at 1MHz, Unity-
Gain Stable, R-R In and Out, 3mA/Amplier, 1.9nV/√Hz.
APPLICATIONS INFORMATION
RECOMMENDED HIGH OR LOW
Hi-Z STATE
236012 F13
B11
CONV
SCK
SDO
12
3
4
9
10
11
12
B10
B9
B3
B2
B1
B0
DATA TRANSFER
ACQUIRE
INPUT
EXECUTE CONVERSION
EXECUTING A DUMMY CONVERSION AND
PUT THE DEVICE INTO SLEEP MODE
tDATA
tCONV
tACQ
SLEEP MODE
tTHROUGHPUT = tACQ + 2 tCONV + tDATA + tSLEEPMODE
RECOMMENDED HIGH OR LOW
Figure 13. Minimize the Time When the Device Draws Power, While the Conversion Results are Available Right After Conversion
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